/* Apple-inspired Light Theme */
:root {
    --bg: #ffffff;
    --bg-secondary: #f5f5f7;
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --text-tertiary: #a1a1a6;
    --border: #d2d2d7;
    --border-light: #e8e8ed;

    --accent: #5856D6;
    --accent-hover: #4240a8;
    --accent-light: rgba(88, 86, 214, 0.1);

    /* Emotion colors - muted, sophisticated */
    --surprise: #32ADE6;
    --fear: #AF52DE;
    --disgust: #30D158;
    --happiness: #FFD60A;
    --sadness: #5856D6;
    --anger: #FF453A;
    --neutral: #8E8E93;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12), 0 4px 12px rgba(0, 0, 0, 0.06);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;

    --transition: 0.2s ease;
}

/* Apple-inspired Dark Theme */
[data-theme="dark"] {
    --bg: #1c1c1e;
    --bg-secondary: #000000;
    --text-primary: #f5f5f7;
    --text-secondary: #98989d;
    --text-tertiary: #636366;
    --border: #38383a;
    --border-light: #2c2c2e;

    --accent: #7d7aff;
    --accent-hover: #9b99ff;
    --accent-light: rgba(125, 122, 255, 0.15);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4), 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5), 0 4px 12px rgba(0, 0, 0, 0.4);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.app {
    max-width: 800px;
    margin: 0 auto;
    padding: 48px 24px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 48px;
    position: relative;
}

header h1 {
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.subtitle {
    font-size: 15px;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Theme Toggle */
.theme-toggle {
    position: absolute;
    top: 0;
    right: 0;
    background: var(--bg);
    border: 1px solid var(--border);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.theme-toggle:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-md);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    color: var(--text-primary);
    transition: var(--transition);
}

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

.theme-toggle .icon-moon {
    display: block;
}

[data-theme="dark"] .theme-toggle .icon-sun {
    display: block;
}

[data-theme="dark"] .theme-toggle .icon-moon {
    display: none;
}

/* Upload Section */
.upload-section {
    margin-bottom: 32px;
}

.upload-container {
    background: var(--bg);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-md);
}

/* Preview Area */
.preview-area {
    background: var(--bg-secondary);
    border: 2px dashed var(--border);
    border-radius: var(--radius-md);
    min-height: 280px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    cursor: pointer;
    transition: var(--transition);
    overflow: hidden;
    position: relative;
}

.preview-area:hover {
    border-color: var(--accent);
    background: var(--accent-light);
}

.preview-area.dragover {
    border-color: var(--accent);
    background: var(--accent-light);
    transform: scale(1.01);
}

.placeholder {
    text-align: center;
    padding: 32px;
}

.placeholder .icon {
    color: var(--text-tertiary);
    margin-bottom: 12px;
}

.placeholder p {
    color: var(--text-secondary);
    font-size: 14px;
}

.placeholder .size-hint {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-top: 8px;
}

.preview-area img {
    max-width: 100%;
    max-height: 400px;
    object-fit: contain;
    border-radius: var(--radius-sm);
}

/* Buttons */
.upload-actions {
    display: flex;
    gap: 12px;
}

.btn {
    flex: 1;
    padding: 14px 24px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: none;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg);
    border-color: var(--accent);
    color: var(--accent);
}

.btn-secondary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Results Section */
.results-section {
    animation: slideUp 0.4s ease;
}

.results-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.results-header h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.face-count {
    font-size: 14px;
    color: var(--text-secondary);
    background: var(--bg);
    padding: 6px 14px;
    border-radius: 20px;
    box-shadow: var(--shadow-sm);
}

.results-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Annotated Image */
.annotated-image-card {
    background: var(--bg);
    border-radius: var(--radius-lg);
    padding: 16px;
    box-shadow: var(--shadow-md);
    animation: fadeIn 0.4s ease;
}

.annotated-image-card img {
    width: 100%;
    border-radius: var(--radius-md);
    cursor: zoom-in;
    transition: var(--transition);
}

.annotated-image-card img:hover {
    opacity: 0.9;
}

.image-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 12px;
}

.image-hint {
    font-size: 12px;
    color: var(--text-tertiary);
    opacity: 0.7;
    transition: var(--transition);
}

.annotated-image-card:hover .image-hint {
    opacity: 1;
    color: var(--accent);
}

.btn-download {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.btn-download:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-download svg {
    flex-shrink: 0;
}

/* Face Cards Container */
.faces-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 16px;
}

.no-faces {
    text-align: center;
    color: var(--text-secondary);
    padding: 40px;
    background: var(--bg);
    border-radius: var(--radius-lg);
    grid-column: 1 / -1;
}

/* Face Card */
.face-card {
    background: var(--bg);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-md);
    animation: cardIn 0.4s ease backwards;
    transition: var(--transition);
}

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

.face-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.face-number {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.emotion-badge {
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    color: white;
}

/* Emotion Badge Colors */
.emotion-badge.surprise { background: var(--surprise); }
.emotion-badge.fear { background: var(--fear); }
.emotion-badge.disgust { background: var(--disgust); color: #1d1d1f; }
.emotion-badge.happiness { background: var(--happiness); color: #1d1d1f; }
.emotion-badge.sadness { background: var(--sadness); }
.emotion-badge.anger { background: var(--anger); }
.emotion-badge.neutral { background: var(--neutral); }

/* Confidence Display */
.confidence-display {
    display: flex;
    justify-content: space-between;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
}

.confidence-label {
    font-size: 13px;
    color: var(--text-secondary);
}

.confidence-value {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

/* Probability List */
.probabilities-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.prob-item {
    display: grid;
    grid-template-columns: 100px 1fr 50px;
    align-items: center;
    gap: 12px;
    opacity: 0.6;
    transition: var(--transition);
}

.prob-item.top {
    opacity: 1;
}

.prob-item:hover {
    opacity: 1;
}

.prob-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
}

.prob-item.top .prob-label {
    color: var(--text-primary);
    font-weight: 500;
}

.emotion-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

/* Emotion Dot Colors */
.emotion-dot.surprise { background: var(--surprise); }
.emotion-dot.fear { background: var(--fear); }
.emotion-dot.disgust { background: var(--disgust); }
.emotion-dot.happiness { background: var(--happiness); }
.emotion-dot.sadness { background: var(--sadness); }
.emotion-dot.anger { background: var(--anger); }
.emotion-dot.neutral { background: var(--neutral); }

.prob-bar-track {
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 3px;
    overflow: hidden;
}

.prob-bar-fill {
    height: 100%;
    border-radius: 3px;
    transition: width 0.6s ease;
}

/* Probability Bar Colors */
.prob-bar-fill.surprise { background: var(--surprise); }
.prob-bar-fill.fear { background: var(--fear); }
.prob-bar-fill.disgust { background: var(--disgust); }
.prob-bar-fill.happiness { background: var(--happiness); }
.prob-bar-fill.sadness { background: var(--sadness); }
.prob-bar-fill.anger { background: var(--anger); }
.prob-bar-fill.neutral { background: var(--neutral); }

.prob-value {
    font-size: 12px;
    color: var(--text-tertiary);
    text-align: right;
    font-variant-numeric: tabular-nums;
}

.prob-item.top .prob-value {
    color: var(--text-primary);
    font-weight: 500;
}

/* Analysis Stage */
.analysis-stage {
    position: fixed;
    inset: 0;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    animation: fadeIn 0.3s ease;
}

.analysis-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    padding: 24px;
    max-width: 90vw;
    max-height: 90vh;
}

.analysis-image-wrapper {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    animation: scaleIn 0.4s ease;
}

.analysis-image-wrapper img {
    display: block;
    max-width: 80vw;
    max-height: 70vh;
    object-fit: contain;
}

/* Scanning Line Effect */
.scan-line {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg,
        transparent 0%,
        var(--accent) 20%,
        var(--accent) 80%,
        transparent 100%
    );
    box-shadow:
        0 0 20px var(--accent),
        0 0 40px var(--accent),
        0 0 60px rgba(88, 86, 214, 0.5);
    animation: scanDown 2s ease-in-out infinite;
    opacity: 0.9;
}

.scan-line::before {
    content: '';
    position: absolute;
    top: 3px;
    left: 0;
    right: 0;
    height: 30px;
    background: linear-gradient(180deg,
        rgba(88, 86, 214, 0.3) 0%,
        transparent 100%
    );
}

@keyframes scanDown {
    0% {
        top: -3px;
        opacity: 0;
    }
    10% {
        opacity: 0.9;
    }
    90% {
        opacity: 0.9;
    }
    100% {
        top: 100%;
        opacity: 0;
    }
}

@keyframes scaleIn {
    from {
        transform: scale(0.9);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

/* Face Detection Boxes */
.face-boxes {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.face-box {
    position: absolute;
    border: 2px solid var(--accent);
    border-radius: 4px;
    opacity: 0;
    transform: scale(1.1);
    transition: all 0.3s ease;
    box-shadow:
        0 0 10px rgba(88, 86, 214, 0.5),
        inset 0 0 20px rgba(88, 86, 214, 0.1);
}

.face-box.revealed {
    opacity: 1;
    transform: scale(1);
}

.face-box::before,
.face-box::after {
    content: '';
    position: absolute;
    width: 12px;
    height: 12px;
    border: 2px solid var(--accent);
}

.face-box::before {
    top: -2px;
    left: -2px;
    border-right: none;
    border-bottom: none;
}

.face-box::after {
    bottom: -2px;
    right: -2px;
    border-left: none;
    border-top: none;
}

.face-box-label {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent);
    color: white;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
    margin-bottom: 4px;
    opacity: 0;
    transition: opacity 0.3s ease 0.2s;
}

.face-box.revealed .face-box-label {
    opacity: 1;
}

/* Analysis Status */
.analysis-status {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--bg);
    padding: 12px 20px;
    border-radius: 30px;
    box-shadow: var(--shadow-md);
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    animation: pulse 1.5s ease infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.5;
        transform: scale(0.8);
    }
}

#statusText {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

/* Completion state */
.analysis-stage.complete .scan-line {
    animation: none;
    opacity: 0;
}

.analysis-stage.complete .status-dot {
    background: var(--disgust);
    animation: none;
}

/* Dark mode adjustments for analysis stage */
[data-theme="dark"] .scan-line {
    background: linear-gradient(90deg,
        transparent 0%,
        var(--accent) 20%,
        var(--accent) 80%,
        transparent 100%
    );
    box-shadow:
        0 0 20px var(--accent),
        0 0 40px var(--accent),
        0 0 60px rgba(125, 122, 255, 0.5);
}

[data-theme="dark"] .scan-line::before {
    background: linear-gradient(180deg,
        rgba(125, 122, 255, 0.3) 0%,
        transparent 100%
    );
}

[data-theme="dark"] .face-box {
    box-shadow:
        0 0 10px rgba(125, 122, 255, 0.5),
        inset 0 0 20px rgba(125, 122, 255, 0.1);
}

/* Error Toast */
.error-toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    background: #1d1d1f;
    color: white;
    padding: 14px 20px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
    z-index: 200;
}

.error-toast svg {
    color: var(--anger);
    flex-shrink: 0;
}

/* Footer */
footer {
    text-align: center;
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--border-light);
}

footer .emotions-list {
    font-size: 13px;
    color: var(--text-tertiary);
    margin-bottom: 16px;
}

.attribution {
    padding-top: 16px;
    border-top: 1px solid var(--border-light);
}

.attribution .course {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.attribution .authors {
    font-size: 12px;
    color: var(--text-tertiary);
}

.attribution .authors a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.attribution .authors a:hover {
    color: var(--accent);
}

/* Lightbox */
.lightbox {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 300;
    padding: 24px;
    animation: fadeIn 0.2s ease;
}

.lightbox img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: var(--radius-md);
    animation: zoomIn 0.3s ease;
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: white;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.2);
}

@keyframes zoomIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Animations */
@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes cardIn {
    from {
        opacity: 0;
        transform: translateY(16px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* Responsive */
@media (max-width: 640px) {
    .app {
        padding: 32px 16px;
    }

    header {
        padding-top: 48px;
    }

    .theme-toggle {
        top: -8px;
        right: 50%;
        transform: translateX(50%);
    }

    header h1 {
        font-size: 26px;
    }

    .upload-container {
        padding: 20px;
    }

    .upload-actions {
        flex-direction: column;
    }

    .preview-area {
        min-height: 200px;
    }

    .faces-container {
        grid-template-columns: 1fr;
    }

    .face-card {
        padding: 20px;
    }

    .prob-item {
        grid-template-columns: 80px 1fr 45px;
        gap: 8px;
    }

    .results-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    /* Analysis stage mobile adjustments */
    .face-box-label {
        font-size: 9px;
        padding: 2px 6px;
        margin-bottom: 2px;
    }

    .face-box::before,
    .face-box::after {
        width: 8px;
        height: 8px;
    }

    .analysis-status {
        padding: 10px 16px;
    }

    #statusText {
        font-size: 13px;
    }
}