/* ========================================
   ConvertMyFilesNow - MUI-Inspired Design
   Material Design 3 styling
   ======================================== */

:root {
    /* MD3 Color System - Dark (Purple/Lavender) */
    --md-primary: #b8a5ff;
    --md-on-primary: #1f0060;
    --md-primary-container: #3a2080;
    --md-on-primary-container: #e0d6ff;
    --md-secondary: #ccc2dc;
    --md-on-secondary: #332d41;
    --md-tertiary: #efb8c8;
    --md-on-tertiary: #4a2532;
    --md-error: #ffb4ab;
    --md-on-error: #690005;
    --md-surface: #141218;
    --md-surface-dim: #141218;
    --md-surface-bright: #3b383e;
    --md-surface-container-lowest: #0f0d13;
    --md-surface-container-low: #1d1b20;
    --md-surface-container: #211f26;
    --md-surface-container-high: #2b2930;
    --md-surface-container-highest: #36343b;
    --md-on-surface: #e6e0e9;
    --md-on-surface-variant: #cac4d0;
    --md-outline: #938f99;
    --md-outline-variant: #49454f;
    --md-inverse-surface: #e6e0e9;
    --md-inverse-on-surface: #322f35;
    --md-success: #7ddc7b;
    --md-success-container: #005304;
    --md-on-success-container: #98f895;

    /* Elevation */
    --md-elevation-1: 0 1px 3px 1px rgba(0,0,0,0.15), 0 1px 2px 0 rgba(0,0,0,0.3);
    --md-elevation-2: 0 2px 6px 2px rgba(0,0,0,0.15), 0 1px 2px 0 rgba(0,0,0,0.3);
    --md-elevation-3: 0 4px 8px 3px rgba(0,0,0,0.15), 0 1px 3px 0 rgba(0,0,0,0.3);
    --md-elevation-4: 0 6px 10px 4px rgba(0,0,0,0.15), 0 2px 3px 0 rgba(0,0,0,0.3);
    --md-elevation-5: 0 8px 12px 6px rgba(0,0,0,0.15), 0 4px 4px 0 rgba(0,0,0,0.3);

    /* Shape */
    --md-shape-xs: 4px;
    --md-shape-sm: 8px;
    --md-shape-md: 12px;
    --md-shape-lg: 16px;
    --md-shape-xl: 28px;
    --md-shape-full: 9999px;

    /* Motion */
    --md-motion-easing-standard: cubic-bezier(0.2, 0, 0, 1);
    --md-motion-easing-emphasized: cubic-bezier(0.2, 0, 0, 1);
    --md-motion-duration-short: 200ms;
    --md-motion-duration-medium: 400ms;
    --md-motion-duration-long: 600ms;

    /* Typography */
    --md-font: 'Inter', 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
}

[data-theme="light"] {
    --md-primary: #7c5cfc;
    --md-on-primary: #ffffff;
    --md-primary-container: #ede7ff;
    --md-on-primary-container: #21005e;
    --md-secondary: #625b71;
    --md-on-secondary: #ffffff;
    --md-tertiary: #7d5260;
    --md-on-tertiary: #ffffff;
    --md-error: #ba1a1a;
    --md-on-error: #ffffff;
    --md-surface: #ffffff;
    --md-surface-dim: #e0dce4;
    --md-surface-bright: #ffffff;
    --md-surface-container-lowest: #ffffff;
    --md-surface-container-low: #f9f5ff;
    --md-surface-container: #f3eeff;
    --md-surface-container-high: #ece6f6;
    --md-surface-container-highest: #e6e0ec;
    --md-on-surface: #1c1b1f;
    --md-on-surface-variant: #49454f;
    --md-outline: #79747e;
    --md-outline-variant: #e0d8ec;
    --md-inverse-surface: #313033;
    --md-inverse-on-surface: #f4eff4;
    --md-success: #006e08;
    --md-success-container: #98f895;
    --md-on-success-container: #002201;

    --md-elevation-1: 0 1px 4px rgba(124, 92, 252, 0.06), 0 1px 2px rgba(0,0,0,0.05);
    --md-elevation-2: 0 2px 8px rgba(124, 92, 252, 0.08), 0 1px 3px rgba(0,0,0,0.06);
    --md-elevation-3: 0 4px 12px rgba(124, 92, 252, 0.10), 0 2px 4px rgba(0,0,0,0.06);
    --md-elevation-4: 0 6px 16px rgba(124, 92, 252, 0.12), 0 2px 6px rgba(0,0,0,0.06);
    --md-elevation-5: 0 8px 20px rgba(124, 92, 252, 0.14), 0 4px 8px rgba(0,0,0,0.06);
}

/* Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--md-font);
    background: var(--md-surface);
    color: var(--md-on-surface);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========== Background Animation ========== */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.bg-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.07;
}

[data-theme="light"] .bg-orb { opacity: 0.04; }

.bg-orb-1 {
    width: 600px; height: 600px;
    background: #7c5cfc;
    top: -200px; left: -100px;
    animation: orbFloat1 20s ease-in-out infinite;
}
.bg-orb-2 {
    width: 500px; height: 500px;
    background: #a78bfa;
    top: 50%; right: -150px;
    animation: orbFloat2 25s ease-in-out infinite;
}
.bg-orb-3 {
    width: 400px; height: 400px;
    background: #c084fc;
    bottom: -100px; left: 30%;
    animation: orbFloat3 22s ease-in-out infinite;
}

@keyframes orbFloat1 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(100px, 50px) scale(1.1); }
    66% { transform: translate(-50px, 100px) scale(0.9); }
}
@keyframes orbFloat2 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(-80px, -60px) scale(0.9); }
    66% { transform: translate(40px, -80px) scale(1.1); }
}
@keyframes orbFloat3 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(60px, -40px) scale(1.1); }
    66% { transform: translate(-40px, 50px) scale(0.9); }
}

/* ========== MUI AppBar / Header ========== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--md-surface-container);
    border-bottom: 1px solid var(--md-outline-variant);
    box-shadow: var(--md-elevation-1);
    backdrop-filter: blur(12px);
}

[data-theme="light"] .header {
    background: rgba(255, 255, 255, 0.92);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    cursor: pointer;
}

.logo-icon {
    display: flex;
    align-items: center;
}

.logo-text {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--md-primary);
    letter-spacing: -0.01em;
}

/* MUI Navigation Tabs */
.nav {
    display: flex;
    gap: 0;
    position: relative;
}

.nav-link {
    position: relative;
    padding: 20px 24px;
    color: var(--md-on-surface-variant);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color var(--md-motion-duration-short) var(--md-motion-easing-standard);
    letter-spacing: 0.01em;
}

.nav-link:hover {
    color: var(--md-on-surface);
    background: rgba(var(--md-on-surface), 0.04);
}

.nav-link.active {
    color: var(--md-primary);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 3px;
    background: var(--md-primary);
    border-radius: 3px 3px 0 0;
}

/* MUI IconButton */
.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: var(--md-shape-full);
    border: none;
    background: transparent;
    color: var(--md-on-surface-variant);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--md-motion-duration-short) var(--md-motion-easing-standard);
    position: relative;
    overflow: hidden;
}

.theme-toggle:hover {
    background: var(--md-surface-container-highest);
}

.theme-toggle::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    opacity: 0;
    background: var(--md-on-surface-variant);
    transition: opacity var(--md-motion-duration-short);
}

.theme-toggle:active::before {
    opacity: 0.12;
}

.moon-icon { display: none; }
[data-theme="light"] .moon-icon { display: block; }
[data-theme="light"] .sun-icon { display: none; }

/* ========== Main ========== */
.main {
    position: relative;
    z-index: 1;
    min-height: calc(100vh - 64px - 60px);
    padding: 40px 0 60px;
}

.page { display: none; }
.page.active { display: block; animation: mdFadeIn var(--md-motion-duration-medium) var(--md-motion-easing-emphasized); }

@keyframes mdFadeIn {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ========== Hero ========== */
.hero {
    text-align: center;
    margin-bottom: 28px;
}

.hero-title {
    font-size: clamp(1.8rem, 4.5vw, 2.6rem);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 12px;
    letter-spacing: -0.025em;
    color: var(--md-on-surface);
}

.gradient-text {
    background: linear-gradient(135deg, var(--md-primary), #a78bfa, #c084fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

[data-theme="light"] .gradient-text {
    background: linear-gradient(135deg, #7c5cfc, #a855f7, #c084fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.05rem;
    color: var(--md-on-surface-variant);
    max-width: 520px;
    margin: 0 auto;
    font-weight: 400;
}

/* ========== MUI Chip Category Bar ========== */
.category-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-bottom: 32px;
}

.cat-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 16px;
    border-radius: var(--md-shape-sm);
    border: 1px solid var(--md-outline);
    background: transparent;
    color: var(--md-on-surface-variant);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--md-motion-duration-short) var(--md-motion-easing-standard);
    font-family: inherit;
    letter-spacing: 0.02em;
    position: relative;
    overflow: hidden;
}

.cat-btn:hover {
    background: var(--md-surface-container-high);
}

.cat-btn.active {
    border-color: transparent;
    background: var(--md-primary);
    color: var(--md-on-primary);
    box-shadow: var(--md-elevation-1);
}

[data-theme="light"] .cat-btn.active {
    background: linear-gradient(135deg, #7c5cfc, #9171fb);
    color: #ffffff;
}

/* ========== MUI Card - Upload Zone ========== */
.upload-zone {
    border: 2px dashed var(--md-outline-variant);
    border-radius: var(--md-shape-xl);
    transition: all var(--md-motion-duration-medium) var(--md-motion-easing-emphasized);
    cursor: pointer;
    margin-bottom: 24px;
    background: var(--md-surface-container-low);
}

[data-theme="light"] .upload-zone {
    border-color: #d0c5f0;
    background: #faf8ff;
}

.upload-zone:hover {
    border-color: var(--md-primary);
    background: var(--md-surface-container);
    box-shadow: var(--md-elevation-1);
}

.upload-zone.drag-over {
    border-color: var(--md-primary);
    background: var(--md-primary-container);
    transform: scale(1.005);
    box-shadow: var(--md-elevation-3);
}

.upload-zone-inner {
    padding: 44px 40px;
    text-align: center;
}

.upload-icon {
    color: var(--md-outline);
    margin-bottom: 16px;
    transition: all var(--md-motion-duration-short) var(--md-motion-easing-standard);
}

.upload-zone:hover .upload-icon {
    color: var(--md-primary);
    transform: translateY(-4px);
}

.upload-title {
    font-size: 1.375rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--md-on-surface);
}

.upload-subtitle {
    color: var(--md-on-surface-variant);
    font-size: 0.875rem;
    margin-bottom: 20px;
}

.upload-formats {
    display: inline-block;
    padding: 6px 16px;
    background: var(--md-surface-container-high);
    border-radius: var(--md-shape-full);
    font-size: 0.75rem;
    color: var(--md-on-surface-variant);
    letter-spacing: 0.01em;
}

/* ========== MUI Card - Conversion Panel ========== */
.conversion-panel {
    background: var(--md-surface-container-low);
    border: 1px solid var(--md-outline-variant);
    border-radius: var(--md-shape-xl);
    padding: 32px;
    margin-bottom: 40px;
    box-shadow: var(--md-elevation-1);
}

.conversion-panel.hidden { display: none; }

.conversion-panel:not(.hidden) {
    animation: mdFadeIn var(--md-motion-duration-medium) var(--md-motion-easing-emphasized);
}

/* File Info - MUI ListItem style */
.file-info {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    background: var(--md-surface-container);
    border-radius: var(--md-shape-lg);
}

.file-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--md-shape-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    color: white;
    flex-shrink: 0;
    letter-spacing: 0.02em;
}

.file-details { flex: 1; min-width: 0; }

.file-name {
    font-size: 0.95rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--md-on-surface);
}

.file-meta {
    font-size: 0.8rem;
    color: var(--md-on-surface-variant);
}

/* MUI IconButton */
.btn-remove {
    width: 40px;
    height: 40px;
    border-radius: var(--md-shape-full);
    border: none;
    background: transparent;
    color: var(--md-on-surface-variant);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--md-motion-duration-short) var(--md-motion-easing-standard);
    flex-shrink: 0;
}

.btn-remove:hover {
    color: var(--md-error);
    background: rgba(255, 180, 171, 0.12);
}

[data-theme="light"] .btn-remove:hover {
    background: rgba(186, 26, 26, 0.06);
}

/* Conversion Arrow */
.conversion-arrow {
    display: flex;
    justify-content: center;
    padding: 16px 0;
    color: var(--md-outline);
}

/* Output Format Selection */
.output-section { margin-bottom: 24px; }

.output-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--md-on-surface-variant);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.format-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

/* MUI Chip / ToggleButton */
.format-btn {
    padding: 8px 20px;
    border-radius: var(--md-shape-sm);
    border: 1px solid var(--md-outline);
    background: transparent;
    color: var(--md-on-surface-variant);
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    cursor: pointer;
    transition: all var(--md-motion-duration-short) var(--md-motion-easing-standard);
    font-family: inherit;
    letter-spacing: 0.04em;
    position: relative;
    overflow: hidden;
}

.format-btn:hover {
    background: var(--md-surface-container-highest);
}

.format-btn.selected {
    border-color: transparent;
    background: var(--md-primary);
    color: var(--md-on-primary);
    box-shadow: var(--md-elevation-1);
}

/* Options Section */
.options-section {
    margin-bottom: 24px;
    padding: 20px;
    background: var(--md-surface-container);
    border-radius: var(--md-shape-lg);
}

.options-section.hidden { display: none; }

.options-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--md-on-surface-variant);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.options-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: center;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.option-group label {
    font-size: 0.75rem;
    color: var(--md-on-surface-variant);
    font-weight: 500;
}

/* MUI Slider style */
.option-group input[type="range"] {
    width: 180px;
    height: 4px;
    accent-color: var(--md-primary);
    border-radius: 2px;
}

/* MUI TextField style */
.option-group input[type="number"],
.option-group select {
    padding: 10px 14px;
    border-radius: var(--md-shape-xs);
    border: 1px solid var(--md-outline);
    background: transparent;
    color: var(--md-on-surface);
    font-size: 0.875rem;
    font-family: inherit;
    outline: none;
    width: 130px;
    transition: border-color var(--md-motion-duration-short);
}

.option-group input[type="number"]:focus,
.option-group select:focus {
    border-color: var(--md-primary);
    border-width: 2px;
    padding: 9px 13px;
}

.option-value {
    font-size: 0.75rem;
    color: var(--md-primary);
    font-weight: 600;
}

/* ========== MUI FAB / Filled Button ========== */
.btn-convert {
    width: 100%;
    padding: 16px 24px;
    border-radius: var(--md-shape-full);
    border: none;
    background: linear-gradient(135deg, #7c5cfc, #9171fb, #a78bfa);
    color: #ffffff;
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--md-motion-duration-short) var(--md-motion-easing-standard);
    font-family: inherit;
    position: relative;
    overflow: hidden;
    letter-spacing: 0.02em;
    box-shadow: var(--md-elevation-2);
}

.btn-convert:hover:not(:disabled) {
    box-shadow: var(--md-elevation-3);
    filter: brightness(1.08);
}

.btn-convert:active:not(:disabled) {
    box-shadow: var(--md-elevation-1);
}

.btn-convert:disabled {
    background: var(--md-surface-container-highest);
    color: var(--md-outline);
    box-shadow: none;
    cursor: not-allowed;
}

[data-theme="light"] .btn-convert:disabled {
    background: var(--md-surface-container-highest);
    color: var(--md-outline);
}

.btn-convert-loader {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-convert-loader.hidden { display: none; }
.btn-convert-text.hidden { display: none; }

.spinner {
    width: 20px;
    height: 20px;
    border: 2.5px solid rgba(255,255,255,0.3);
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* MUI LinearProgress */
.progress-bar {
    height: 6px;
    background: var(--md-surface-container-highest);
    border-radius: 3px;
    margin-top: 20px;
    overflow: visible;
    position: relative;
}

.progress-bar.hidden { display: none; }

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #7c5cfc, #a78bfa, #c084fc);
    border-radius: 3px;
    width: 0%;
    transition: width 0.3s var(--md-motion-easing-standard);
}

.progress-percent {
    display: block;
    text-align: center;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--md-primary);
    margin-top: 8px;
}

/* ========== Result / Error Cards ========== */
.result, .error {
    text-align: center;
    padding: 36px 20px;
    margin-top: 24px;
    border-radius: var(--md-shape-lg);
}

.result.hidden, .error.hidden { display: none; }

.result:not(.hidden), .error:not(.hidden) {
    animation: mdFadeIn var(--md-motion-duration-medium) var(--md-motion-easing-emphasized);
}

.result {
    background: var(--md-success-container);
    color: var(--md-on-success-container);
}

[data-theme="light"] .result {
    background: rgba(0, 110, 8, 0.06);
    border: 1px solid rgba(0, 110, 8, 0.15);
}

.result-icon { color: var(--md-success); margin-bottom: 12px; }
[data-theme="light"] .result-icon { color: var(--md-success); }

.result-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.result-meta {
    font-size: 0.8125rem;
    opacity: 0.7;
    margin-bottom: 24px;
}

/* MUI Filled Tonal Button */
.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--md-shape-full);
    border: none;
    background: var(--md-success);
    color: #002201;
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--md-motion-duration-short) var(--md-motion-easing-standard);
    font-family: inherit;
    margin-bottom: 12px;
    box-shadow: var(--md-elevation-1);
    letter-spacing: 0.02em;
}

[data-theme="light"] .btn-download {
    background: #16a34a;
    color: white;
    box-shadow: 0 2px 8px rgba(22, 163, 74, 0.25);
}

.btn-download:hover {
    box-shadow: var(--md-elevation-3);
    filter: brightness(1.06);
}

/* MUI Text Button */
.btn-another {
    display: inline-block;
    padding: 10px 24px;
    border-radius: var(--md-shape-full);
    border: none;
    background: transparent;
    color: var(--md-primary);
    font-size: 0.8125rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--md-motion-duration-short) var(--md-motion-easing-standard);
    font-family: inherit;
    letter-spacing: 0.02em;
}

.btn-another:hover {
    background: var(--md-surface-container-highest);
}

[data-theme="light"] .btn-another:hover {
    background: rgba(124, 92, 252, 0.08);
}

/* Error */
.error {
    background: rgba(255, 180, 171, 0.08);
    border: 1px solid rgba(255, 180, 171, 0.2);
}

[data-theme="light"] .error {
    background: rgba(186, 26, 26, 0.06);
    border: 1px solid rgba(186, 26, 26, 0.15);
}

.error-icon { color: var(--md-error); margin-bottom: 12px; }

.error-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.error-message {
    font-size: 0.8125rem;
    color: var(--md-on-surface-variant);
    margin-bottom: 24px;
}

/* ========== Batch Panel ========== */
.batch-panel {
    background: var(--md-surface-container-low);
    border: 1px solid var(--md-outline-variant);
    border-radius: var(--md-shape-xl);
    padding: 24px;
    margin-bottom: 40px;
    box-shadow: var(--md-elevation-1);
}

.batch-panel.hidden { display: none; }

.batch-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--md-on-surface);
}

.batch-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 16px;
    max-height: 300px;
    overflow-y: auto;
}

.batch-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--md-surface-container);
    border-radius: var(--md-shape-md);
    font-size: 0.875rem;
    transition: background var(--md-motion-duration-short);
}

.batch-item:hover {
    background: var(--md-surface-container-high);
}

.batch-item-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--md-shape-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.6rem;
    font-weight: 700;
    text-transform: uppercase;
    color: white;
    flex-shrink: 0;
}

.batch-item-name {
    flex: 1;
    min-width: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--md-on-surface);
}

.batch-item-size {
    color: var(--md-on-surface-variant);
    font-size: 0.75rem;
    flex-shrink: 0;
}

.batch-item-status {
    font-size: 0.75rem;
    font-weight: 600;
    flex-shrink: 0;
}

.batch-item-status.done { color: var(--md-success); }
[data-theme="light"] .batch-item-status.done { color: var(--md-success); }
.batch-item-status.error { color: var(--md-error); }
.batch-item-status.converting { color: var(--md-primary); }

.batch-controls {
    display: flex;
    gap: 12px;
    align-items: center;
}

/* MUI Select */
.batch-format-select {
    flex: 1;
    padding: 12px 16px;
    border-radius: var(--md-shape-xs);
    border: 1px solid var(--md-outline);
    background: transparent;
    color: var(--md-on-surface);
    font-size: 0.875rem;
    font-family: inherit;
    outline: none;
    transition: border-color var(--md-motion-duration-short);
}

.batch-format-select:focus {
    border-color: var(--md-primary);
    border-width: 2px;
    padding: 11px 15px;
}

.btn-convert-batch {
    padding: 12px 28px;
    border-radius: var(--md-shape-full);
    border: none;
    background: var(--md-primary);
    color: var(--md-on-primary);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--md-motion-duration-short) var(--md-motion-easing-standard);
    font-family: inherit;
    white-space: nowrap;
    box-shadow: var(--md-elevation-1);
    letter-spacing: 0.02em;
}

.btn-convert-batch:hover {
    box-shadow: var(--md-elevation-3);
    filter: brightness(1.08);
}

.batch-progress.hidden { display: none; }

.batch-status {
    text-align: center;
    font-size: 0.8125rem;
    color: var(--md-on-surface-variant);
    margin-top: 8px;
}

/* ========== Stats - MUI Card Grid ========== */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    margin-bottom: 32px;
}

.stat {
    text-align: center;
    padding: 24px 16px;
    background: var(--md-surface-container);
    border-radius: var(--md-shape-lg);
    transition: all var(--md-motion-duration-short) var(--md-motion-easing-standard);
    box-shadow: var(--md-elevation-1);
}

.stat:hover {
    box-shadow: var(--md-elevation-3);
    transform: translateY(-2px);
}

.stat-number {
    display: block;
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--md-primary);
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.6875rem;
    color: var(--md-on-surface-variant);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 500;
    margin-top: 4px;
}

/* ========== Features - MUI Cards ========== */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 14px;
    margin-bottom: 28px;
}

.feature-card {
    padding: 28px;
    background: var(--md-surface-container);
    border-radius: var(--md-shape-lg);
    transition: all var(--md-motion-duration-medium) var(--md-motion-easing-emphasized);
    box-shadow: var(--md-elevation-1);
}

.feature-card:hover {
    box-shadow: var(--md-elevation-3);
    transform: translateY(-4px);
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--md-shape-md);
    background: var(--md-primary-container);
    color: var(--md-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

[data-theme="light"] .feature-icon {
    background: #ede7ff;
    color: #7c5cfc;
}

.feature-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--md-on-surface);
}

.feature-card p {
    font-size: 0.8125rem;
    color: var(--md-on-surface-variant);
    line-height: 1.6;
}

/* ========== Formats Page ========== */
.page-title {
    font-size: 2rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 8px;
    color: var(--md-on-surface);
}

.page-subtitle {
    text-align: center;
    color: var(--md-on-surface-variant);
    margin-bottom: 40px;
    font-size: 0.95rem;
}

.formats-list {
    display: grid;
    gap: 20px;
}

.format-category {
    background: var(--md-surface-container);
    border-radius: var(--md-shape-lg);
    padding: 24px;
    box-shadow: var(--md-elevation-1);
}

.format-category h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--md-on-surface);
}

.format-category-badge {
    padding: 2px 12px;
    border-radius: var(--md-shape-full);
    font-size: 0.6875rem;
    font-weight: 600;
    background: var(--md-primary-container);
    color: var(--md-on-primary-container);
}

[data-theme="light"] .format-category-badge {
    background: var(--md-primary-container);
    color: var(--md-on-primary-container);
}

.format-table {
    width: 100%;
    border-collapse: collapse;
}

.format-table th,
.format-table td {
    text-align: left;
    padding: 10px 14px;
    font-size: 0.8125rem;
}

.format-table th {
    color: var(--md-on-surface-variant);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.6875rem;
    border-bottom: 1px solid var(--md-outline-variant);
}

.format-table td {
    color: var(--md-on-surface-variant);
    border-bottom: 1px solid var(--md-surface-container-highest);
}

.format-table tr:last-child td { border-bottom: none; }

.format-table tr:hover td {
    background: var(--md-surface-container-high);
}

.format-ext {
    display: inline-block;
    padding: 2px 10px;
    background: var(--md-surface-container-highest);
    border-radius: var(--md-shape-xs);
    font-size: 0.75rem;
    font-weight: 600;
    font-family: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
    margin: 2px;
    color: var(--md-primary);
}

/* ========== About Page ========== */
.about-content {
    display: grid;
    gap: 20px;
}

.about-card {
    background: var(--md-surface-container);
    border-radius: var(--md-shape-lg);
    padding: 28px;
    box-shadow: var(--md-elevation-1);
}

.about-card h2 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--md-on-surface);
}

.about-card p {
    font-size: 0.9rem;
    color: var(--md-on-surface-variant);
    line-height: 1.7;
}

.about-card ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.about-card li {
    font-size: 0.875rem;
    color: var(--md-on-surface-variant);
    padding-left: 20px;
    position: relative;
}

.about-card li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--md-primary);
}

/* ========== Legal Pages (Privacy & Terms) ========== */
.page-legal .legal-content {
    max-width: 800px;
    margin: 0 auto;
}

.legal-updated {
    text-align: center;
    color: var(--md-outline);
    font-size: 0.875rem;
    margin-bottom: 24px;
    font-style: italic;
}

.legal-card {
    background: var(--md-surface-container-low);
    border: 1px solid var(--md-outline-variant);
    border-radius: 16px;
    padding: 24px 28px;
    margin-bottom: 16px;
}

.legal-card h2 {
    color: var(--md-primary);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.legal-card p {
    color: var(--md-on-surface);
    line-height: 1.7;
    margin-bottom: 10px;
    font-size: 0.9rem;
}

.legal-card p:last-child {
    margin-bottom: 0;
}

.legal-card ul {
    list-style: none;
    padding: 0;
    margin: 8px 0 0;
}

.legal-card li {
    padding: 4px 0 4px 20px;
    position: relative;
    color: var(--md-on-surface);
    font-size: 0.9rem;
    line-height: 1.6;
}

.legal-card li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 12px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--md-primary);
}

.legal-card a {
    color: var(--md-primary);
    text-decoration: underline;
}

.legal-card a:hover {
    color: var(--md-tertiary);
}

.footer-legal {
    margin-top: 8px;
    font-size: 0.7rem;
    color: var(--md-outline);
}

.footer-legal a {
    color: var(--md-outline);
    text-decoration: underline;
}

.footer-legal a:hover {
    color: var(--md-primary);
}

/* ========== Feedback Form ========== */
.feedback-form-card {
    background: var(--md-surface-container-low);
    border: 1px solid var(--md-outline-variant);
    border-radius: 16px;
    padding: 32px;
    max-width: 640px;
    margin: 0 auto;
}

.feedback-intro {
    text-align: center;
    color: var(--md-on-surface-variant);
    margin-bottom: 24px;
    font-size: 0.95rem;
}

.feedback-type-selector {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.feedback-type-option {
    flex: 1;
    min-width: 120px;
    cursor: pointer;
}

.feedback-type-option input { display: none; }

.feedback-type-label {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: 12px;
    border: 2px solid var(--md-outline-variant);
    background: var(--md-surface);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--md-on-surface);
    transition: all 0.2s;
    justify-content: center;
}

.feedback-type-option input:checked + .feedback-type-label {
    border-color: var(--md-primary);
    background: var(--md-primary-container);
    color: var(--md-on-primary-container);
}

.feedback-field {
    margin-bottom: 16px;
}

.feedback-field label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--md-on-surface);
    margin-bottom: 6px;
}

.feedback-field input,
.feedback-field textarea {
    width: 100%;
    padding: 10px 14px;
    border-radius: 12px;
    border: 1px solid var(--md-outline-variant);
    background: var(--md-surface);
    color: var(--md-on-surface);
    font-family: inherit;
    font-size: 0.9rem;
    transition: border-color 0.2s;
    box-sizing: border-box;
}

.feedback-field input:focus,
.feedback-field textarea:focus {
    outline: none;
    border-color: #7c5cfc;
    box-shadow: 0 0 0 3px rgba(124, 92, 252, 0.12);
}

.feedback-field textarea {
    resize: vertical;
    min-height: 100px;
}

.star-rating {
    display: flex;
    gap: 4px;
    margin-top: 4px;
}

.star-rating .star {
    font-size: 1.8rem;
    color: var(--md-outline-variant);
    cursor: pointer;
    transition: color 0.15s, transform 0.15s;
    line-height: 1;
}

.star-rating .star:hover,
.star-rating .star.active {
    color: #F59E0B;
    transform: scale(1.15);
}

.feedback-submit-btn {
    width: 100%;
    padding: 12px;
    border-radius: 12px;
    border: none;
    background: linear-gradient(135deg, #7c5cfc, #9171fb, #a78bfa);
    color: #ffffff;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    margin-top: 8px;
    transition: all 0.2s;
    box-shadow: 0 2px 8px rgba(124, 92, 252, 0.25);
}

.feedback-submit-btn:hover {
    background: linear-gradient(135deg, #6b4ce6, #8060f0, #9b7ef5);
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(124, 92, 252, 0.35);
}

.feedback-submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.feedback-success {
    text-align: center;
    padding: 24px;
    color: #16a34a;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.feedback-success svg {
    stroke: #16a34a;
}

/* Floating Feedback Button */
.floating-feedback-btn {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    background: linear-gradient(135deg, #7c5cfc, #a78bfa);
    color: #ffffff;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(124, 92, 252, 0.35);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s, box-shadow 0.2s;
    z-index: 1000;
}

.floating-feedback-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(124, 92, 252, 0.45);
}

/* ========== How It Works (SEO) ========== */
.seo-how-it-works {
    margin: 36px 0 28px;
}

.how-steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 20px;
}

.how-step {
    text-align: center;
    padding: 24px 16px;
    background: var(--md-surface-container-low);
    border: 1px solid var(--md-outline-variant);
    border-radius: 16px;
    transition: all 0.2s;
}

.how-step:hover {
    box-shadow: var(--md-elevation-2);
    transform: translateY(-2px);
}

.how-step-num {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, #7c5cfc, #a78bfa);
    color: #ffffff;
    font-weight: 700;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 12px;
}

.how-step h3 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--md-on-surface);
    margin-bottom: 6px;
}

.how-step p {
    font-size: 0.82rem;
    color: var(--md-on-surface-variant);
    line-height: 1.5;
    margin: 0;
}

/* ========== Use Cases (SEO keyword content) ========== */
.seo-use-cases {
    margin: 28px 0;
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 20px;
}

.use-case {
    padding: 20px;
    background: var(--md-surface-container-low);
    border: 1px solid var(--md-outline-variant);
    border-radius: 14px;
    transition: all 0.2s;
}

.use-case:hover {
    box-shadow: var(--md-elevation-2);
    transform: translateY(-2px);
}

.use-case h3 {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--md-on-surface);
    margin-bottom: 6px;
}

.use-case p {
    font-size: 0.8rem;
    color: var(--md-on-surface-variant);
    line-height: 1.55;
    margin: 0;
}

/* ========== Inline Newsletter ========== */
/* Ad Containers */
.ad-container {
    margin: 20px 0;
    text-align: center;
    min-height: 90px;
    overflow: hidden;
    border-radius: 12px;
}
.ad-container ins {
    background: transparent;
}
.ad-below-upload {
    margin-top: 16px;
}
.ad-after-download {
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px solid var(--md-outline-variant, #e0e0e0);
}
.ad-between-sections {
    margin: 32px 0;
}
.ad-before-newsletter {
    margin-bottom: 24px;
}
@media (max-width: 600px) {
    .ad-container { margin: 12px 0; min-height: 50px; }
    .ad-between-sections { margin: 20px 0; }
}

.newsletter-inline {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 24px;
    background: var(--md-surface-container);
    border: 1px solid var(--md-outline-variant);
    border-radius: 14px;
    margin: 24px 0;
    flex-wrap: wrap;
}

.newsletter-inline-text {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--md-on-surface);
    white-space: nowrap;
}

.newsletter-inline-text svg {
    color: var(--md-primary);
    flex-shrink: 0;
}

.newsletter-inline-form {
    display: flex;
    gap: 8px;
    flex: 1;
    min-width: 250px;
}

.newsletter-inline-form input {
    flex: 1;
    padding: 8px 14px;
    border-radius: var(--md-shape-full);
    border: 1px solid var(--md-outline-variant);
    background: var(--md-surface);
    color: var(--md-on-surface);
    font-size: 0.85rem;
    font-family: inherit;
    min-width: 0;
}

.newsletter-inline-form input:focus {
    outline: none;
    border-color: var(--md-primary);
}

@media (max-width: 900px) {
    .how-steps { grid-template-columns: 1fr; }
    .use-cases-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 600px) {
    .use-cases-grid { grid-template-columns: 1fr; }
    .newsletter-inline { flex-direction: column; align-items: stretch; }
    .newsletter-inline-form { min-width: 0; }
}

/* ========== Content + Sidebar Layout (for ads) ========== */
.content-with-sidebar {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 32px;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
}

.content-main {
    min-width: 0;
}

.content-sidebar {
    min-width: 0;
}

.sidebar-sticky {
    position: sticky;
    top: 80px;
}

/* ========== Ad Slots ========== */
.ad-container {
    position: relative;
    z-index: 1;
}

.ad-top-banner {
    padding: 12px 0;
    background: var(--md-surface-container-lowest);
    border-bottom: 1px solid var(--md-outline-variant);
}

.ad-mid-content {
    margin: 32px 0;
}

.ad-bottom-banner {
    margin: 40px 0 32px;
}

.ad-slot {
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.ad-leaderboard {
    min-height: 90px;
}

.ad-responsive {
    min-height: 100px;
}

.ad-sidebar {
    min-height: 600px;
}

.ad-sidebar-sm {
    min-height: 250px;
}

.ad-in-content {
    margin: 20px 0;
    min-height: 280px;
}

/* Ad placeholders (remove when real ads are added) */
.ad-placeholder {
    width: 100%;
    max-width: 728px;
    height: 0;
    border: none;
    border-radius: var(--md-shape-md);
    display: none; /* Hidden until ads are enabled */
    align-items: center;
    justify-content: center;
    color: var(--md-outline);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    background: var(--md-surface-container-lowest);
}
/* Uncomment below to show ad placeholders:
.ad-placeholder { display: flex; height: 90px; border: 2px dashed var(--md-outline-variant); }
*/

.ad-placeholder-sm {
    max-width: 336px;
    height: 280px;
}

.ad-placeholder-md {
    max-width: 300px;
    height: 250px;
}

.ad-placeholder-tall {
    max-width: 300px;
    height: 600px;
    flex-direction: column;
    gap: 4px;
    line-height: 1.4;
    text-align: center;
}

/* ========== Related Conversions Panel ========== */
.related-panel {
    background: var(--md-surface-container);
    border-radius: var(--md-shape-lg);
    padding: 20px 24px;
    margin: 20px 0;
    border: 1px solid var(--md-outline-variant);
}

.related-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
    color: var(--md-on-surface);
}

.related-header h3 {
    font-size: 1rem;
    font-weight: 700;
    margin: 0;
}

.related-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.related-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: var(--md-shape-full);
    border: 1px solid var(--md-outline-variant);
    background: var(--md-surface-container-low);
    color: var(--md-on-surface);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.related-chip:hover {
    background: var(--md-primary-container);
    color: var(--md-on-primary-container);
    border-color: var(--md-primary);
    transform: translateY(-1px);
}

.related-chip svg {
    width: 14px;
    height: 14px;
    opacity: 0.6;
}

/* ========== Conversion Tips ========== */
.conversion-tip {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 14px 18px;
    margin: 16px 0;
    background: var(--md-primary-container);
    border-radius: var(--md-shape-md);
    border-left: 4px solid var(--md-primary);
}

.conversion-tip svg {
    flex-shrink: 0;
    color: var(--md-primary);
    margin-top: 1px;
}

.conversion-tip p {
    margin: 0;
    font-size: 0.85rem;
    line-height: 1.5;
    color: var(--md-on-primary-container);
}

/* ========== Newsletter Button ========== */
.newsletter-btn {
    padding: 8px 18px;
    border-radius: var(--md-shape-full);
    border: none;
    background: linear-gradient(135deg, #7c5cfc, #9171fb);
    color: #ffffff;
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s;
    box-shadow: 0 2px 6px rgba(124, 92, 252, 0.2);
}

.newsletter-btn:hover { transform: translateY(-1px); }
.newsletter-btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

.newsletter-success {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: #16a34a;
}

/* ========== Popular Conversions (SEO + clickable) ========== */
.popular-conversions {
    margin: 40px 0 32px;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--md-on-surface);
}

.conversion-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.conversion-link {
    display: inline-flex;
    align-items: center;
    padding: 10px 20px;
    border-radius: var(--md-shape-full);
    background: var(--md-surface-container);
    color: var(--md-on-surface-variant);
    text-decoration: none;
    font-size: 0.8125rem;
    font-weight: 500;
    transition: all var(--md-motion-duration-short) var(--md-motion-easing-standard);
    box-shadow: var(--md-elevation-1);
    cursor: pointer;
    border: 1px solid transparent;
}

.conversion-link:hover {
    background: var(--md-primary-container);
    color: var(--md-on-primary-container);
    box-shadow: var(--md-elevation-2);
    transform: translateY(-1px);
    border-color: var(--md-primary);
}

/* ========== Enhanced Footer ========== */
.footer {
    position: relative;
    z-index: 1;
    padding: 40px 0 20px;
    border-top: 1px solid var(--md-outline-variant);
    background: var(--md-surface-container-lowest);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 24px;
    gap: 24px;
}

.footer-brand .logo-text {
    display: block;
    margin-bottom: 8px;
}

.footer-brand p {
    font-size: 0.8125rem;
    color: var(--md-on-surface-variant);
    max-width: 360px;
}

.footer-links {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.footer-links .nav-link {
    padding: 8px 16px;
    font-size: 0.8125rem;
    color: var(--md-on-surface-variant);
    text-decoration: none;
    border-radius: var(--md-shape-sm);
    transition: all var(--md-motion-duration-short);
}

.footer-links .nav-link:hover {
    color: var(--md-primary);
    background: var(--md-surface-container-high);
}

.footer-bottom {
    padding-top: 16px;
    border-top: 1px solid var(--md-outline-variant);
    text-align: center;
    font-size: 0.75rem;
    color: var(--md-outline);
}

/* ========== Utilities ========== */
.hidden { display: none !important; }

/* File type colors - using Material You tones */
.ft-image { background: linear-gradient(135deg, #D81B60, #E91E63); }
.ft-document { background: linear-gradient(135deg, #1565C0, #1976D2); }
.ft-spreadsheet { background: linear-gradient(135deg, #2E7D32, #388E3C); }
.ft-audio { background: linear-gradient(135deg, #E65100, #EF6C00); }
.ft-video { background: linear-gradient(135deg, #B71C1C, #C62828); }
.ft-data { background: linear-gradient(135deg, #6A1B9A, #7B1FA2); }
.ft-ebook { background: linear-gradient(135deg, #00695C, #00796B); }
.ft-font { background: linear-gradient(135deg, #37474F, #455A64); }
.ft-archive { background: linear-gradient(135deg, #4E342E, #5D4037); }
.ft-code { background: linear-gradient(135deg, #283593, #303F9F); }
.ft-unknown { background: linear-gradient(135deg, #546E7A, #607D8B); }

/* ========== Capabilities Strip ========== */
.capabilities-strip {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 28px;
}

.capability {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px;
    background: var(--md-surface-container-low);
    border: 1px solid var(--md-outline-variant);
    border-radius: 14px;
    transition: all 0.2s;
}

.capability:hover {
    box-shadow: var(--md-elevation-2);
    transform: translateY(-2px);
}

.capability-icon {
    width: 40px;
    height: 40px;
    border-radius: 11px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.capability div:last-child {
    display: flex;
    flex-direction: column;
    gap: 3px;
    min-width: 0;
}

.capability strong {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--md-on-surface);
}

.capability span {
    font-size: 0.73rem;
    color: var(--md-on-surface-variant);
    line-height: 1.4;
}

@media (max-width: 900px) {
    .capabilities-strip { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
    .capabilities-strip { grid-template-columns: 1fr; }
}

/* ========== Tools Showcase (Main Page) ========== */
.tools-showcase {
    margin: 32px 0 28px;
}

.tools-showcase-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

.showcase-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    background: var(--md-surface-container-low);
    border: 1px solid var(--md-outline-variant);
    border-radius: 14px;
    text-decoration: none;
    color: inherit;
    transition: all 0.25s ease;
    cursor: pointer;
}

.showcase-card:hover {
    border-color: var(--md-primary);
    box-shadow: var(--md-elevation-3);
    transform: translateY(-3px);
}

[data-theme="light"] .showcase-card:hover {
    background: #faf8ff;
}

.showcase-icon {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.showcase-card div:last-child {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.showcase-card strong {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--md-on-surface);
    white-space: nowrap;
}

.showcase-card span {
    font-size: 0.72rem;
    color: var(--md-on-surface-variant);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.view-all-tools-btn {
    display: inline-block;
    padding: 10px 24px !important;
    border-radius: var(--md-shape-full);
    background: linear-gradient(135deg, #7c5cfc, #9171fb);
    color: #ffffff !important;
    font-weight: 600;
    font-size: 0.875rem;
    text-decoration: none;
    transition: all 0.2s;
    box-shadow: 0 2px 8px rgba(124, 92, 252, 0.2);
}

.view-all-tools-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 14px rgba(124, 92, 252, 0.35);
}

@media (max-width: 900px) {
    .tools-showcase-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
    .tools-showcase-grid { grid-template-columns: 1fr; }
}

/* ========== Language Selector ========== */
.lang-selector {
    position: relative;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--md-shape-full);
    border: 2px solid var(--md-primary);
    background: linear-gradient(135deg, rgba(124, 92, 252, 0.08), rgba(167, 139, 250, 0.12));
    color: var(--md-primary);
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
    font-family: inherit;
    animation: langPulse 3s ease-in-out infinite;
    box-shadow: 0 0 0 0 rgba(124, 92, 252, 0.3);
}

@keyframes langPulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(124, 92, 252, 0.3); }
    50% { box-shadow: 0 0 0 6px rgba(124, 92, 252, 0); }
}

.lang-btn:hover {
    background: linear-gradient(135deg, #7c5cfc, #a78bfa);
    border-color: #7c5cfc;
    color: #fff;
    transform: scale(1.05);
    animation: none;
}

.lang-btn.lang-changed {
    background: linear-gradient(135deg, #10b981, #34d399);
    border-color: #10b981;
    color: #fff;
    animation: langConfirm 0.5s ease;
}

@keyframes langConfirm {
    0% { transform: scale(1); }
    50% { transform: scale(1.15); }
    100% { transform: scale(1); }
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 200px;
    max-height: 360px;
    overflow-y: auto;
    background: var(--md-surface-container);
    border: 1px solid var(--md-outline-variant);
    border-radius: 14px;
    box-shadow: var(--md-elevation-4);
    z-index: 200;
    padding: 6px;
}

[data-theme="light"] .lang-dropdown {
    background: #ffffff;
}

.lang-option {
    padding: 10px 14px;
    font-size: 0.85rem;
    color: var(--md-on-surface);
    cursor: pointer;
    border-radius: 10px;
    transition: all 0.15s;
}

.lang-option:hover {
    background: var(--md-surface-container-high);
}

.lang-option.selected {
    background: var(--md-primary-container);
    color: var(--md-on-primary-container);
    font-weight: 600;
}

@media (max-width: 768px) {
    .lang-btn span { display: none; }
    .lang-btn { padding: 6px 8px; }
    .lang-dropdown { right: -40px; }
}

/* ========== Tools Page ========== */
.tools-section-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--md-on-surface);
    margin: 32px 0 16px;
}

.tools-section-title:first-of-type {
    margin-top: 8px;
}

.tools-section-title svg {
    color: var(--md-primary);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 14px;
}

.tool-card {
    padding: 24px;
    background: var(--md-surface-container-low);
    border: 1px solid var(--md-outline-variant);
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.25s ease;
}

.tool-card:hover {
    border-color: var(--md-primary);
    box-shadow: var(--md-elevation-3);
    transform: translateY(-3px);
}

.tool-icon {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
}

.tool-card h3 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--md-on-surface);
    margin-bottom: 6px;
}

.tool-card p {
    font-size: 0.8rem;
    color: var(--md-on-surface-variant);
    line-height: 1.5;
    margin: 0;
}

/* Tool Workspace */
.tool-workspace {
    margin-top: 24px;
    padding: 28px;
    background: var(--md-surface-container-low);
    border: 1px solid var(--md-outline-variant);
    border-radius: 20px;
    animation: mdFadeIn var(--md-motion-duration-medium) var(--md-motion-easing-emphasized);
}

.tool-workspace-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.tool-back-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--md-shape-full);
    border: 1px solid var(--md-outline-variant);
    background: transparent;
    color: var(--md-on-surface-variant);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}

.tool-back-btn:hover {
    background: var(--md-surface-container-high);
    color: var(--md-primary);
    border-color: var(--md-primary);
}

.tool-workspace-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--md-on-surface);
}

.tool-upload-zone {
    border: 2px dashed var(--md-outline-variant);
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.25s;
    background: var(--md-surface-container);
    margin-bottom: 16px;
}

[data-theme="light"] .tool-upload-zone {
    border-color: #d0c5f0;
    background: #faf8ff;
}

.tool-upload-zone:hover {
    border-color: var(--md-primary);
    box-shadow: var(--md-elevation-1);
}

.tool-upload-zone .upload-zone-inner {
    padding: 36px 24px;
}

.tool-options {
    padding: 20px;
    background: var(--md-surface-container);
    border-radius: 14px;
    margin-bottom: 16px;
}

.tool-options label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--md-on-surface-variant);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.tool-options input[type="text"],
.tool-options input[type="number"],
.tool-options input[type="password"],
.tool-options select {
    width: 100%;
    padding: 10px 14px;
    border-radius: 10px;
    border: 1px solid var(--md-outline-variant);
    background: var(--md-surface);
    color: var(--md-on-surface);
    font-family: inherit;
    font-size: 0.9rem;
    margin-bottom: 14px;
    transition: border-color 0.2s;
    box-sizing: border-box;
}

.tool-options input:focus,
.tool-options select:focus {
    outline: none;
    border-color: #7c5cfc;
    box-shadow: 0 0 0 3px rgba(124, 92, 252, 0.12);
}

.tool-options .option-row {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.tool-options .option-row > div {
    flex: 1;
    min-width: 120px;
}

.tool-process-btn {
    margin-top: 8px;
}

.tool-result {
    margin-top: 20px;
    padding: 24px;
    border-radius: 14px;
    text-align: center;
    animation: mdFadeIn 0.3s ease;
}

.tool-result.success {
    background: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.tool-result.info {
    background: var(--md-surface-container);
    border: 1px solid var(--md-outline-variant);
    text-align: left;
}

.tool-result h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--md-on-surface);
}

.tool-result .result-meta {
    font-size: 0.85rem;
    color: var(--md-on-surface-variant);
    margin-bottom: 16px;
}

.tool-result .btn-download {
    display: inline-flex;
}

.tool-result .hash-table {
    width: 100%;
    border-collapse: collapse;
}

.tool-result .hash-table th,
.tool-result .hash-table td {
    padding: 10px 14px;
    text-align: left;
    font-size: 0.85rem;
    border-bottom: 1px solid var(--md-outline-variant);
}

.tool-result .hash-table th {
    font-weight: 700;
    color: var(--md-primary);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.tool-result .hash-table td {
    color: var(--md-on-surface);
    font-family: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
    font-size: 0.78rem;
    word-break: break-all;
}

.tool-result .hash-table tr:last-child td {
    border-bottom: none;
}

.tool-file-list {
    list-style: none;
    padding: 0;
    margin: 0 0 16px;
}

.tool-file-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: var(--md-surface-container);
    border-radius: 10px;
    margin-bottom: 6px;
    font-size: 0.85rem;
    color: var(--md-on-surface);
}

.tool-file-item .file-remove {
    margin-left: auto;
    background: none;
    border: none;
    color: var(--md-error);
    cursor: pointer;
    font-size: 1.1rem;
    padding: 2px 6px;
    border-radius: 6px;
}

.tool-file-item .file-remove:hover {
    background: rgba(255, 0, 0, 0.08);
}

.metadata-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 2px;
}

.metadata-grid .meta-key {
    font-weight: 600;
    color: var(--md-primary);
    font-size: 0.8rem;
    padding: 6px 10px;
    background: var(--md-surface-container-high);
    border-radius: 6px 0 0 6px;
}

.metadata-grid .meta-val {
    font-size: 0.8rem;
    color: var(--md-on-surface);
    padding: 6px 10px;
    background: var(--md-surface-container);
    border-radius: 0 6px 6px 0;
    word-break: break-all;
}

.effect-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 14px;
}

.effect-chip {
    padding: 8px 16px;
    border-radius: var(--md-shape-full);
    border: 1px solid var(--md-outline-variant);
    background: transparent;
    color: var(--md-on-surface-variant);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}

.effect-chip:hover {
    background: var(--md-surface-container-high);
}

.effect-chip.selected {
    background: linear-gradient(135deg, #7c5cfc, #9171fb);
    color: #ffffff;
    border-color: transparent;
}

@media (max-width: 768px) {
    .tools-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .tool-card { padding: 18px; }
    .tool-workspace { padding: 20px; }
    .tool-options .option-row { flex-direction: column; }
    .metadata-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
    .tools-grid { grid-template-columns: 1fr; }
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
    .content-with-sidebar {
        grid-template-columns: 1fr;
    }

    .content-sidebar {
        display: none; /* Hide sidebar ads on tablet */
    }

    .ad-in-content {
        display: flex; /* Show in-content ads instead */
    }
}

@media (max-width: 768px) {
    .header .container { height: 56px; }
    .nav { gap: 0; }
    .nav-link { padding: 16px 12px; font-size: 0.8125rem; }
    .hero-title { font-size: 1.75rem; }
    .upload-zone-inner { padding: 40px 20px; }
    .conversion-panel { padding: 20px; }
    .stats-bar { grid-template-columns: repeat(2, 1fr); }
    .features { grid-template-columns: 1fr; }
    .category-bar { gap: 6px; }
    .cat-btn { padding: 6px 12px; font-size: 0.75rem; }
    .batch-controls { flex-direction: column; }
    .file-info { flex-wrap: wrap; }

    .ad-leaderboard { min-height: 60px; }
    .ad-placeholder { max-width: 100%; height: 60px; }
    .ad-placeholder-sm { height: 250px; }

    .footer-content { flex-direction: column; }

    .conversion-links { gap: 8px; }
    .conversion-link { padding: 8px 14px; font-size: 0.75rem; }
}

@media (max-width: 480px) {
    .content-with-sidebar { padding: 0 16px; }
    .stats-bar { grid-template-columns: repeat(2, 1fr); gap: 8px; }
    .stat { padding: 16px 10px; }
    .stat-number { font-size: 1.3rem; }
    .logo-text { font-size: 1.1rem; }

    .ad-top-banner { display: none; } /* Hide top banner on small screens */
}

/* ========== Scrollbar ========== */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: var(--md-outline-variant);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--md-outline);
}

/* ========== MUI Ripple Effect ========== */
.ripple {
    position: absolute;
    border-radius: 50%;
    background: currentColor;
    opacity: 0.15;
    transform: scale(0);
    animation: rippleAnim 0.6s var(--md-motion-easing-standard);
    pointer-events: none;
}

@keyframes rippleAnim {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* Preview image */
.preview-img {
    max-width: 200px;
    max-height: 120px;
    border-radius: var(--md-shape-sm);
    margin-top: 8px;
    border: 1px solid var(--md-outline-variant);
}

/* MUI Tooltip */
[title] {
    position: relative;
}