/* ==========================================================================
   FaceShield — Custom CSS
   Dark theme, fully responsive, zero external frameworks.
   ========================================================================== */

   :root {
    /* Colors */
    --bg-main: #0A0A0F;
    --bg-card: #13131A;
    --bg-darker: #050508;
    
    --border: #1E1E2E;
    --border-hover: #2D2D3D;
    
    --accent: #7C3AED;
    --accent-hover: #6D28D9;
    --accent-light: rgba(124, 58, 237, 0.15);
    
    --cyan: #06B6D4;
    
    --text-primary: #E2E8F0;
    --text-muted: #64748B;
    
    --danger: #EF4444;
    --success: #10B981;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Metrics */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition: 200ms ease-in-out;
}

/* ── Base Reset ── */
* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* ── Typography ── */
h1, h2, h3 { font-weight: 600; color: #F8FAFC; }
h1 { font-size: 1.5rem; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1.1rem; }
.font-mono { font-family: var(--font-mono); }
.text-muted { color: var(--text-muted); }
.text-small { font-size: 0.875rem; }
.text-accent { color: var(--accent); }
.text-cyan { color: var(--cyan); }
.text-danger { color: var(--danger); }

/* ── Utilities ── */
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-8 { margin-top: 2rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.ml-4 { margin-left: 1rem; }
.mr-2 { margin-right: 0.5rem; }
.p-4 { padding: 1rem; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }
.hidden { display: none !important; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.flex-center { display: flex; justify-content: center; align-items: center; }
.flex-end { display: flex; justify-content: flex-end; align-items: center; }
.flex-col { flex-direction: column; }
.h-full { height: 100%; }
.self-start { align-self: flex-start; }
.relative { position: relative; }
.overflow-hidden { overflow: hidden; }
.z-10 { z-index: 10; }
.text-center { text-align: center; }
.bg-darker { background-color: var(--bg-darker); }
.border-red { border: 1px solid rgba(239, 68, 68, 0.3); }
.rounded { border-radius: var(--radius-md); }

/* ── Layout ── */
.app-container {
    max-width: 960px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* ── Header & Stepper ── */
.app-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 3rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--accent);
    margin-bottom: 2rem;
}

.stepper {
    display: flex;
    align-items: center;
    width: 100%;
    max-width: 600px;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    transition: color var(--transition);
}

.step-indicator {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.step.active { color: var(--text-primary); }
.step.active .step-indicator {
    border-color: var(--accent);
    background: var(--accent-light);
    color: var(--accent);
    box-shadow: 0 0 12px var(--accent-light);
}

.step.completed .step-indicator {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.step-line {
    flex: 1;
    height: 2px;
    background: var(--border);
    margin: 0 1rem;
    transform: translateY(-12px);
    transition: background var(--transition);
}
.step.completed + .step-line { background: var(--accent); }

/* ── Cards ── */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-weight: 500;
    font-size: 0.9375rem;
    cursor: pointer;
    transition: all var(--transition);
    border: none;
    outline: none;
}

.btn:focus-visible { box-shadow: 0 0 0 2px var(--bg-main), 0 0 0 4px var(--accent); }
.btn:active { transform: translateY(0); }
.btn:hover { transform: translateY(-1px); }

.btn-primary {
    background: var(--accent);
    color: white;
    box-shadow: 0 2px 10px rgba(124, 58, 237, 0.3);
}
.btn-primary:hover {
    background: var(--accent-hover);
    box-shadow: 0 4px 15px rgba(124, 58, 237, 0.4);
}
.btn-primary:disabled {
    background: var(--border);
    color: var(--text-muted);
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

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

.btn-danger {
    background: transparent;
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}
.btn-danger:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--danger);
}

.btn-sm { padding: 0.375rem 0.75rem; font-size: 0.8125rem; }
.btn-lg { padding: 0.875rem 2rem; font-size: 1rem; border-radius: var(--radius-md); }

.text-btn {
    background: none; border: none;
    color: var(--accent); cursor: pointer;
    font-family: var(--font-sans); font-weight: 500;
    font-size: inherit; text-decoration: underline;
}

/* Shine Effect for CTAs */
.shine-effect {
    position: relative;
    overflow: hidden;
}
.shine-effect::after {
    content: '';
    position: absolute;
    top: -50%; left: -60%;
    width: 20%; height: 200%;
    background: rgba(255,255,255,0.2);
    transform: rotate(30deg);
    transition: transform 0.5s;
}
.shine-effect:hover::after {
    transform: rotate(30deg) translate(500%, 0);
}

/* ── Upload Zone ── */
.upload-zone {
    border: 2px dashed var(--border);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    cursor: pointer;
    transition: all var(--transition);
}
.upload-zone.drag-over {
    border-color: var(--accent);
    background: var(--accent-light);
}
.upload-icon {
    color: var(--text-muted);
    margin-bottom: 1rem;
    transition: color var(--transition);
}
.upload-zone:hover .upload-icon, .upload-zone.drag-over .upload-icon {
    color: var(--accent);
}

/* ── Progress Bars ── */
.progress-bar-bg {
    width: 100%;
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
}
.progress-bar-fill {
    height: 100%;
    background: var(--accent);
    width: 0%;
    transition: width 0.3s ease;
}

/* ── Face Grid ── */
.face-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 1.5rem;
}

.face-card {
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition);
    position: relative;
}
.face-card:hover { transform: scale(1.03); border-color: var(--border-hover); }
.face-card.selected {
    border-color: var(--accent);
    box-shadow: 0 0 15px var(--accent-light);
}

.face-img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    display: block;
}

.face-info {
    padding: 0.75rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 0.25rem;
    background: var(--bg-darker);
}

/* Custom Checkbox inside face card */
.face-checkbox {
    width: 18px; height: 18px;
    border-radius: 4px;
    border: 2px solid var(--text-muted);
    display: flex; align-items: center; justify-content: center;
    transition: all var(--transition);
}
.face-card.selected .face-checkbox {
    background: var(--accent);
    border-color: var(--accent);
}
.face-checkbox svg {
    stroke: white; stroke-width: 3;
    opacity: 0; transition: opacity var(--transition);
}
.face-card.selected .face-checkbox svg { opacity: 1; }

/* Face status labels (BLURRED / NOT BLURRED) */
.face-status {
    font-size: 0.625rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    padding: 2px 6px;
    border-radius: 4px;
    text-transform: uppercase;
    transition: all var(--transition);
}
.face-status.status-safe {
    color: var(--success);
    background: rgba(16, 185, 129, 0.12);
}
.face-status.status-blurred {
    color: var(--danger);
    background: rgba(239, 68, 68, 0.15);
}

/* ── Skeleton Shimmer ── */
@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}
.skeleton {
    background: linear-gradient(90deg, var(--border) 25%, var(--border-hover) 50%, var(--border) 75%);
    background-size: 200% 100%;
    animation: shimmer 2s infinite linear;
    aspect-ratio: 3/4;
    border: none;
}

/* ── Settings Segmented Control ── */
.segmented-control {
    display: flex;
    background: var(--bg-darker);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 4px;
}
.segment {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}
.segment:hover { color: var(--text-primary); }
.segment.active {
    background: var(--bg-card);
    color: var(--text-primary);
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

/* ── Custom Range Slider ── */
.styled-slider {
    -webkit-appearance: none;
    width: 100%;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    outline: none;
    margin: 1rem 0;
}
.styled-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    box-shadow: 0 0 10px var(--accent-light);
    transition: transform 0.1s;
}
.styled-slider::-webkit-slider-thumb:hover { transform: scale(1.2); }
.styled-slider::-moz-range-thumb {
    width: 20px; height: 20px; border-radius: 50%;
    background: var(--accent); cursor: pointer; border: none;
}
.slider-labels {
    display: flex; justify-content: space-between;
    font-size: 0.75rem; color: var(--text-muted);
}
.slider-label { cursor: pointer; transition: color var(--transition); }
.slider-label:hover { color: var(--text-primary); }

/* ── Settings Layout ── */
.settings-layout {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 2rem;
}
.preview-canvas-wrapper {
    width: 200px; height: 200px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--bg-darker);
}

/* ── Processing Screen ── */
.process-card {
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.shimmer-bg {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(circle at 50% 50%, var(--accent-light) 0%, transparent 60%);
    opacity: 0.5;
    animation: pulse 4s infinite alternate;
}
@keyframes pulse {
    0% { opacity: 0.3; transform: scale(0.9); }
    100% { opacity: 0.7; transform: scale(1.1); }
}

.circular-progress {
    position: relative;
    width: 160px; height: 160px;
    margin: 0 auto;
}
.circular-progress svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.circular-progress circle {
    fill: none; stroke-width: 8; stroke-linecap: round;
}
.circular-progress .bg { stroke: var(--border); }
.circular-progress .progress {
    stroke: var(--cyan);
    stroke-dasharray: 283; /* 2 * pi * 45 */
    stroke-dashoffset: 283;
    transition: stroke-dashoffset 0.5s ease;
}
.circular-progress .percentage {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.5rem; color: var(--text-primary);
}
.stats-grid {
    display: flex; justify-content: center; gap: 3rem;
}
.stat-item {
    display: flex; flex-direction: column; gap: 0.25rem;
}

/* ── Video Player ── */
.video-wrapper {
    position: relative;
    width: 100%;
    background: #000;
    border-radius: var(--radius-md);
    overflow: hidden;
}
video {
    width: 100%;
    max-height: 400px;
    display: block;
}
.custom-controls {
    position: absolute;
    bottom: 0; left: 0; right: 0;
    background: linear-gradient(transparent, rgba(0,0,0,0.8));
    padding: 1rem;
    display: flex; align-items: center; gap: 1rem;
    opacity: 0; transition: opacity var(--transition);
}
.video-wrapper:hover .custom-controls { opacity: 1; }
.control-btn {
    background: none; border: none; color: white; cursor: pointer;
}
.timeline-slider {
    flex: 1; -webkit-appearance: none; height: 4px;
    background: rgba(255,255,255,0.3); border-radius: 2px;
}
.timeline-slider::-webkit-slider-thumb {
    -webkit-appearance: none; width: 12px; height: 12px;
    border-radius: 50%; background: var(--accent); cursor: pointer;
}

/* ── Custom Radio ── */
.radio-label {
    display: inline-flex; align-items: center; cursor: pointer;
    font-size: 0.9375rem;
}
.radio-label input { display: none; }
.radio-custom {
    width: 18px; height: 18px; border-radius: 50%;
    border: 2px solid var(--border); margin-right: 8px;
    position: relative; transition: all var(--transition);
}
.radio-label input:checked + .radio-custom { border-color: var(--accent); }
.radio-label input:checked + .radio-custom::after {
    content: ''; position: absolute;
    top: 3px; left: 3px; width: 8px; height: 8px;
    border-radius: 50%; background: var(--accent);
}

/* ── Toast Notifications ── */
#toast-container {
    position: fixed; top: 1.5rem; right: 1.5rem;
    z-index: 9999; display: flex; flex-direction: column; gap: 0.5rem;
}
.toast {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
    display: flex; align-items: center; gap: 0.75rem;
    transform: translateX(120%);
    animation: slideIn 0.3s forwards cubic-bezier(0.2, 0.8, 0.2, 1);
}
.toast.error { border-left: 4px solid var(--danger); }
.toast.success { border-left: 4px solid var(--success); }
.toast.fade-out { animation: fadeOut 0.3s forwards; }

@keyframes slideIn { to { transform: translateX(0); } }
@keyframes fadeOut { to { opacity: 0; transform: translateY(-10px); } }

/* ── Success Banner ── */
.success-banner {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: var(--success);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

/* ── Canvas Wrapper (Manual Region) ── */
.canvas-wrapper {
    position: relative;
    width: 100%;
    max-height: 500px;
    overflow: auto;
    background: #000;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    display: flex;
    justify-content: center;
}

/* ── Media Queries ── */
@media (max-width: 768px) {
    .app-container { padding: 1rem; margin-bottom: 2rem; }
    .app-header { margin-bottom: 1.5rem; }
    .logo { margin-bottom: 1.5rem; }
    .settings-layout { grid-template-columns: 1fr; gap: 1rem; }
    .stepper span { display: none; }
    .step-indicator { width: 28px; height: 28px; font-size: 0.875rem; }
    .step-line { margin: 0 0.5rem; }
    
    /* Specific layout fixes for smaller screens */
    #step-detect .flex-between { flex-direction: column; align-items: flex-start; gap: 1rem; }
    #step-detect .action-group { width: 100%; display: flex; gap: 0.5rem; justify-content: space-between; }
    
    /* Make large buttons span full width on mobile */
    .flex-end.mt-8.gap-4 { flex-direction: column-reverse; gap: 0.75rem; }
    .flex-end.mt-8.gap-4 .btn-lg { width: 100%; }
    
    #step-output .flex-center.gap-4 { flex-direction: column-reverse; }
    #step-output .btn { width: 100%; }
    
    /* Settings Segmented Control */
    .segmented-control { flex-direction: column; }
    
    /* Stats grid */
    .stats-grid { gap: 1.5rem; flex-wrap: wrap; }
    
    /* Video Picker */
    .video-picker-header { flex-direction: column; gap: 0.75rem; align-items: stretch; }
    .video-picker-header-text p { margin-top: 0.5rem; }
    .video-picker-controls { flex-wrap: wrap; justify-content: center; }
    .video-picker-footer { flex-direction: column; align-items: stretch; gap: 1rem; }
    .video-picker-footer > div { justify-content: center; width: 100%; }
    .picker-timeline { min-width: 150px; }
}

@media (max-width: 480px) {
    .face-grid { grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); gap: 1rem; }
    .btn { font-size: 0.85rem; padding: 0.5rem 1rem; }
    h1 { font-size: 1.25rem; }
    h2 { font-size: 1.1rem; }
    h3 { font-size: 1rem; }
    .upload-zone { min-height: 200px; padding: 1.5rem; text-align: center; }
    .upload-icon { width: 36px; height: 36px; margin-bottom: 0.5rem; }
    .settings-preview .preview-canvas-wrapper { width: 160px; height: 160px; margin: 0 auto; }
    .radio-label { display: block; margin-left: 0; margin-bottom: 0.75rem; }
    .circular-progress { width: 120px; height: 120px; }
    .circular-progress .percentage { font-size: 1.25rem; }
}
@media (prefers-reduced-motion: reduce) {
    * { animation: none !important; transition: none !important; }
}

/* ── Live Video Picker Modal ── */
.video-picker-modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.92);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    backdrop-filter: blur(8px);
}
.video-picker-modal.hidden { display: none !important; }

.video-picker-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 900px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 25px 80px rgba(0,0,0,0.8);
}

.video-picker-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    padding: 1.25rem 1.75rem;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}
.video-picker-header-text h3 { margin: 0; }
.video-picker-header-text p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.video-picker-viewport {
    position: relative;
    flex: 1;
    background: #000;
    overflow: hidden;
}
.picker-video {
    width: 100%;
    max-height: 55vh;
    object-fit: contain;
    display: block;
}

.picker-canvas-wrapper {
    position: absolute;
    inset: 0;
    pointer-events: none;
}
.picker-canvas-wrapper.draw-mode {
    pointer-events: all;
    cursor: crosshair;
}
.draw-mode-hint {
    position: absolute;
    top: 1rem;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(124, 58, 237, 0.9);
    color: white;
    font-size: 0.85rem;
    font-weight: 500;
    padding: 0.4rem 1rem;
    border-radius: 999px;
    pointer-events: none;
    white-space: nowrap;
    display: none;
    z-index: 10;
}
.picker-canvas-wrapper.draw-mode .draw-mode-hint { display: block; }

.video-picker-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.25rem;
    background: var(--bg-darker);
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}
.picker-play-btn {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-primary);
    width: 36px; height: 36px;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    flex-shrink: 0;
    transition: all var(--transition);
}
.picker-play-btn:hover { border-color: var(--accent); color: var(--accent); }

.picker-timeline {
    flex: 1;
    -webkit-appearance: none;
    height: 4px;
    background: rgba(255,255,255,0.15);
    border-radius: 2px;
    cursor: pointer;
    outline: none;
}
.picker-timeline::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px; height: 14px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    box-shadow: 0 0 8px rgba(124,58,237,0.5);
}
.picker-time-label {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
    flex-shrink: 0;
    min-width: 90px;
    text-align: right;
}

.video-picker-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.75rem;
    border-top: 1px solid var(--border);
    flex-shrink: 0;
    gap: 1rem;
    flex-wrap: wrap;
}
.picker-mode-indicator {
    font-size: 0.85rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.picker-mode-indicator .dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--text-muted);
    transition: background var(--transition);
}
.picker-mode-indicator.drawing .dot { background: var(--accent); }
.picker-mode-indicator.drawing { color: var(--text-primary); }

/* ── Face Selection Hint ── */
.select-hint {
    background: rgba(124, 58, 237, 0.08);
    border: 1px solid rgba(124, 58, 237, 0.25);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.select-hint svg { flex-shrink: 0; color: var(--accent); }

/* face card NOT selected shows a subtle overlay */
.face-card:not(.selected)::after {
    content: 'Not blurred';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    background: rgba(0,0,0,0.65);
    color: var(--text-muted);
    font-size: 0.68rem;
    text-align: center;
    padding: 3px 0;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}
.face-card.selected::after { display: none; }