/* ===== VARIABLES ===== */
:root {
    /* Light Theme */
    --primary: #4361ee;
    --primary-light: #4895ef;
    --primary-dark: #3a0ca3;
    --secondary: #f72585;
    --accent: #4cc9f0;
    --success: #2ecc71;
    --warning: #f39c12;
    --danger: #e74c3c;
    --info: #3498db;

    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --bg-card: #ffffff;

    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --text-tertiary: #95a5a6;

    --border-color: #dfe6e9;
    --shadow-color: rgba(0, 0, 0, 0.1);

    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #4361ee, #3a0ca3);
    --gradient-secondary: linear-gradient(135deg, #f72585, #b5179e);
    --gradient-accent: linear-gradient(135deg, #4cc9f0, #3a86ff);
    --gradient-success: linear-gradient(135deg, #2ecc71, #27ae60);
    --gradient-warning: linear-gradient(135deg, #f39c12, #e67e22);

    /* Shadows */
    --shadow-sm: 0 2px 8px var(--shadow-color);
    --shadow-md: 0 4px 16px var(--shadow-color);
    --shadow-lg: 0 8px 32px var(--shadow-color);
    --shadow-xl: 0 16px 48px var(--shadow-color);
}

.dark-theme {
    /* Dark Theme */
    --primary: #5a7dff;
    --primary-light: #6d8eff;
    --primary-dark: #4a1dc9;
    --secondary: #ff3d96;
    --accent: #5cd5ff;
    --success: #27d27d;
    --warning: #ffaa47;
    --danger: #ff5252;
    --info: #4dabf7;

    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-card: #1e293b;

    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;

    --border-color: #475569;
    --shadow-color: rgba(0, 0, 0, 0.3);

    --gradient-primary: linear-gradient(135deg, #5a7dff, #4a1dc9);
    --gradient-secondary: linear-gradient(135deg, #ff3d96, #d81b60);
    --gradient-accent: linear-gradient(135deg, #5cd5ff, #3a86ff);
}

/* ===== RESET & BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: var(--transition);
    overflow-x: hidden;
    line-height: 1.6;
    width: 100%;
    position: relative;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.upload-panel-wrapper {
    width: 100%;
    padding: 0 40px; /* Equal margins on left and right */
    box-sizing: border-box;
    margin: 2rem 0;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
    line-height: 1.2;
}

.title-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    text-align: center;
}

.section-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    text-align: center;
    max-width: 600px;
    margin: 0 auto 2rem;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 14px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    outline: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--border-color);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-glow {
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent);
    animation: glow 2s infinite;
}

@keyframes glow {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* ===== NAVBAR ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(var(--bg-primary), 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
}

.logo-text {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 4px;
    line-height: 1.2;
}

.logo-line-1,
.logo-line-2 {
    display: inline;
}

.logo-line-2 {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.logo .version-badge {
    display: inline-block;
    margin-left: 4px;
}

.logo i {
    font-size: 1.75rem;
    color: var(--primary);
}

.logo-highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.version-badge {
    background: var(--gradient-accent);
    color: white;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.mobile-menu-toggle {
    display: none;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    padding: 8px 12px;
    border-radius: var(--radius-md);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
    background: var(--bg-secondary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-toggle {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    transition: var(--transition);
    position: relative;
}

.theme-toggle:hover {
    transform: rotate(15deg);
    background: var(--border-color);
}

.theme-toggle .fa-sun {
    display: none;
}

.dark-theme .theme-toggle .fa-moon {
    display: none;
}

.dark-theme .theme-toggle .fa-sun {
    display: block;
}

/* ===== QUALITY CARDS ===== */
.quality-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin: 2rem 0;
}

/* Responsive styles moved to responsive.css */

.quality-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    text-align: center;
    cursor: pointer;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    border: 2px solid transparent;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    min-height: 240px; /* Fixed height to match flipped Custom card */
    height: 240px;
    box-shadow: var(--shadow-md);
    transform: translateY(0);
}

.quality-card:hover:not(.active) {
    transform: translateY(-4px) !important;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}

.dark-theme .quality-card:hover:not(.active) {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
}

/* Apply shadow to flip card front/back on hover (non-active only) */
.quality-card.flip-card:hover:not(.active) .flip-card-front,
.quality-card.flip-card:hover:not(.active) .flip-card-back {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}

.dark-theme .quality-card.flip-card:hover:not(.active) .flip-card-front,
.dark-theme .quality-card.flip-card:hover:not(.active) .flip-card-back {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
}

.quality-card.active {
    border: 2px solid var(--primary);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
    transform: translateY(-4px) !important;
}

.dark-theme .quality-card.active {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
}

/* Ensure active card keeps its position even on hover */
.quality-card.active:hover {
    transform: translateY(-4px) !important;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}

.dark-theme .quality-card.active:hover {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
}

/* Remove border from Custom card when not active */
.quality-card.flip-card:not(.active) .flip-card-front,
.quality-card.flip-card:not(.active) .flip-card-back {
    border: 2px solid transparent;
}

.quality-card.flip-card.active .flip-card-front,
.quality-card.flip-card.active .flip-card-back {
    border: 2px solid var(--primary);
}

.quality-icon {
    width: 64px;
    height: 64px;
    min-width: 64px;
    min-height: 64px;
    max-width: 64px;
    max-height: 64px;
    aspect-ratio: 1 / 1;
    margin: 0 auto 16px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: white;
    flex-shrink: 0;
    box-sizing: border-box;
}

.quality-card[data-quality="maximum"] .quality-icon {
    background: var(--gradient-secondary);
}

.quality-card[data-quality="best"] .quality-icon {
    background: var(--gradient-success);
}

.quality-card[data-quality="custom"] .quality-icon {
    background: var(--gradient-warning);
}

/* Flip Card Styles - Maintains exact same size */
.flip-card {
    perspective: 1000px;
    padding: 0;
    overflow: hidden;
    min-height: 240px; /* Match other cards */
    height: 240px;
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 240px; /* Fixed height to match other cards */
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.flip-card.flipped .flip-card-inner {
    transform: rotateY(180deg);
}

/* Apply translateY and shadow to active flip card - the card itself lifts */
.quality-card.flip-card.active {
    transform: translateY(-4px) !important;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}

.dark-theme .quality-card.flip-card.active {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
}

/* Active flip card shadow on front/back */
.quality-card.flip-card.active .flip-card-front,
.quality-card.flip-card.active .flip-card-back {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}

.dark-theme .quality-card.flip-card.active .flip-card-front,
.dark-theme .quality-card.flip-card.active .flip-card-back {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
}

/* When flipped and active, maintain rotation on inner */
.quality-card.flip-card.active.flipped .flip-card-inner {
    transform: rotateY(180deg);
}

/* Hover effect for flip cards - transform the parent card */
.quality-card.flip-card:hover:not(.active) {
    transform: translateY(-4px) !important;
}

.flip-card-front,
.flip-card-back {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 240px; /* Fixed height to match other cards */
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    border: 2px solid transparent; /* No border by default */
    box-shadow: var(--shadow-md);
    box-sizing: border-box;
    overflow: hidden; /* Prevent content overflow */
    transition: var(--transition);
}

.flip-card-front {
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 24px; /* Match other cards exactly */
}

.flip-card-back {
    transform: rotateY(180deg);
    background: var(--bg-card);
    overflow-y: auto;
    overflow-x: hidden;
    justify-content: flex-start;
    padding: 16px; /* Reduced padding to fit content in same height */
    border: 2px solid transparent; /* No border */
}

.flip-card-back h3 {
    margin-bottom: 6px;
    color: var(--text-primary);
    font-size: 0.9rem;
    text-align: center;
    font-weight: 600;
}

.flip-card-back .settings-grid {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.flip-card-back .setting-item {
    margin-bottom: 0;
}

.flip-card-back .setting-item label {
    display: block;
    margin-bottom: 3px;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.75rem;
}

.flip-card-back input[type="range"],
.flip-card-back select,
.flip-card-back input[type="number"] {
    width: 100%;
    padding: 3px 5px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.75rem;
}

.flip-card-back .slider-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 1px;
    font-size: 0.6rem;
    color: var(--text-secondary);
}

.flip-card-back .size-inputs {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-top: 6px;
}

.flip-card-back .size-inputs input {
    width: 70px;
    padding: 4px;
    font-size: 0.8rem;
}

.flip-card-back .size-inputs span {
    font-size: 0.8rem;
}

.quality-indicator {
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    margin: 16px 0;
    overflow: hidden;
}

.quality-bar {
    height: 100%;
    background: var(--gradient-primary);
    transition: width 0.3s ease;
}

.quality-stats {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    color: var(--text-tertiary);
}

.quality-saving {
    font-weight: 600;
    color: var(--text-secondary);
}

.quality-speed {
    font-size: 11px;
    color: var(--text-tertiary);
    font-style: italic;
}

.selected-badge {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 32px;
    height: 32px;
    background: var(--success);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

/* ===== UPLOAD SECTION ===== */
.upload-section {
    margin: 2rem 0;
}

.upload-section .quality-cards {
    margin-bottom: 2rem;
}

/* Upload Panel - Single container for everything */
.upload-panel {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: 40px;
    margin: 2rem auto;
    box-shadow: var(--shadow-lg);
    width: calc(100% - 80px); /* Full width minus equal margins */
    max-width: none;
    box-sizing: border-box;
}

.upload-zone {
    border: 3px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 50px 40px;
    text-align: center;
    transition: var(--transition);
    margin: 0 0 30px 0;
    position: relative;
    overflow: hidden;
    width: 100%;
    background: transparent;
    box-sizing: border-box;
}

.upload-zone.drag-over {
    border-color: var(--primary);
    background: rgba(67, 97, 238, 0.05);
}

.upload-content {
    position: relative;
    z-index: 1;
}

.upload-icon {
    font-size: 56px;
    color: var(--primary);
    margin-bottom: 16px;
    position: relative;
}

.upload-pulse {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    background: var(--primary);
    border-radius: 50%;
    opacity: 0.2;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 0.2;
    }
    50% {
        transform: translate(-50%, -50%) scale(1.2);
        opacity: 0.1;
    }
}

.upload-title {
    font-size: 1.5rem;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.upload-subtitle {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.supported-formats {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin: 24px 0;
}

.format-tag {
    background: var(--bg-tertiary);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
}

.format-tag:last-child {
    background: var(--gradient-primary);
    color: white;
}

.upload-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 0;
    padding: 30px 0;
    border-top: 1px solid var(--border-color);
}

.file-list {
    margin: 20px 0;
    min-height: 0;
}

.action-buttons {
    display: flex;
    gap: 12px;
    margin-top: 30px;
    justify-content: flex-start;
    padding-top: 20px;
}

.action-buttons .btn {
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.action-buttons .btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.action-buttons .btn-secondary:hover {
    background: var(--border-color);
    transform: translateY(-2px);
}

.action-buttons .btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.action-buttons .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.stat-icon {
    width: 48px;
    height: 48px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--primary);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
}

.stat-label {
    font-size: 14px;
    color: var(--text-tertiary);
}

/* ===== FILE LIST ===== */
.file-list {
    margin: 2rem 0;
}

.file-item {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.file-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-sm);
}

.file-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: white;
}

.file-icon.image { background: var(--gradient-accent); }
.file-icon.pdf { background: var(--gradient-secondary); }
.file-icon.document { background: var(--gradient-warning); }
.file-icon.audio { background: var(--gradient-success); }
.file-icon.video { background: var(--gradient-primary); }
.file-icon.archive { background: var(--gradient-info); }

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

.file-name {
    font-weight: 500;
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-details {
    display: flex;
    gap: 16px;
    font-size: 12px;
    color: var(--text-tertiary);
}

.file-size {
    font-weight: 500;
}

.file-status {
    margin-left: auto;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.file-status.pending {
    background: rgba(255, 193, 7, 0.1);
    color: #ffc107;
}

.file-status.processing {
    background: rgba(13, 110, 253, 0.1);
    color: var(--primary);
}

.file-status.completed {
    background: rgba(40, 167, 69, 0.1);
    color: var(--success);
}

.file-status.error {
    background: rgba(220, 53, 69, 0.1);
    color: var(--danger);
}

/* ===== PROGRESS ===== */
.processing-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-lg);
}

.processing-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.progress-container {
    margin: 24px 0;
}

.progress-bar {
    height: 12px;
    background: var(--bg-tertiary);
    border-radius: 6px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #27d27d, #2ecc71, #27ae60);
    width: 0%;
    transition: width 0.3s ease-out, background 0.2s ease-out;
    border-radius: 6px;
    box-shadow: 0 0 10px rgba(46, 204, 113, 0.5);
}

.progress-pulse {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg,
    transparent,
    rgba(46, 204, 113, 0.4),
    transparent);
    animation: progressPulse 1.5s infinite;
    pointer-events: none;
}

@keyframes progressPulse {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.progress-text {
    display: flex;
    justify-content: space-between;
    margin-top: 8px;
    font-size: 14px;
    color: var(--text-secondary);
}

/* ===== RESULTS ===== */
.results-card {
    /* Results card styles will be added here */
}