/* ============================================
   SleepGuard — Premium Dark UI
   ============================================ */

:root {
    --bg-deep: #06060f;
    --bg-base: #0a0a1a;
    --bg-surface: #10102a;
    --bg-card: #161640;
    --glass-bg: rgba(16, 16, 42, 0.65);
    --glass-border: rgba(255, 255, 255, 0.07);
    --glass-blur: 24px;
    --accent: #00d4ff;
    --accent-glow: rgba(0, 212, 255, 0.35);
    --success: #00ff88;
    --warning: #ffaa00;
    --danger: #ff3366;
    --text-primary: #e8e8ff;
    --text-secondary: #9999bb;
    --text-muted: #666688;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font);
    background: var(--bg-deep);
    color: var(--text-primary);
    line-height: 1.5;
}

/* ── Scrollbar ─────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--glass-border); border-radius: 3px; }

/* ── Utility ───────────────────────────── */
.hidden { display: none !important; }

/* ── Glass Panel ───────────────────────── */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
}

/* ── Buttons ───────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 22px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}
.btn-sm { padding: 6px 14px; font-size: 0.8rem; }
.btn-large { padding: 14px 36px; font-size: 1.1rem; border-radius: var(--radius-md); }
.btn-primary {
    background: linear-gradient(135deg, var(--accent), #0090ff);
    color: #fff;
    box-shadow: 0 4px 20px var(--accent-glow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 30px var(--accent-glow); }
.btn-secondary {
    background: rgba(255,255,255,0.06);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
}
.btn-secondary:hover { background: rgba(255,255,255,0.12); }
.btn-danger {
    background: linear-gradient(135deg, var(--danger), #cc0044);
    color: #fff;
    box-shadow: 0 4px 20px rgba(255,51,102,0.4);
}
.btn-danger:hover { transform: translateY(-2px); box-shadow: 0 6px 30px rgba(255,51,102,0.5); }
.btn-ghost { background: transparent; color: var(--text-secondary); }
.btn-ghost:hover { color: var(--text-primary); }
.btn-glow { animation: btn-glow-pulse 2s ease-in-out infinite; }
@keyframes btn-glow-pulse {
    0%, 100% { box-shadow: 0 4px 20px var(--accent-glow); }
    50% { box-shadow: 0 4px 40px var(--accent-glow), 0 0 60px rgba(0,212,255,0.15); }
}

.icon-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    background: var(--glass-bg);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent); }

/* ── Loading Screen ────────────────────── */
#loading-screen {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-deep);
}
.loader-content { text-align: center; }
.loader-title {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}
.loader-subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 24px;
}

/* Eye animation */
.eye-animation {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    position: relative;
}
.eye-outer {
    width: 80px;
    height: 80px;
    border: 3px solid var(--accent);
    border-radius: 50% 10% 50% 10%;
    transform: rotate(45deg);
    animation: eye-blink 2s ease-in-out infinite;
    position: absolute;
}
.eye-inner {
    width: 24px;
    height: 24px;
    background: var(--accent);
    border-radius: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 20px var(--accent-glow);
    animation: eye-glow 2s ease-in-out infinite;
}
@keyframes eye-blink {
    0%, 40%, 100% { transform: rotate(45deg) scaleY(1); }
    45%, 55% { transform: rotate(45deg) scaleY(0.1); }
}
@keyframes eye-glow {
    0%, 100% { box-shadow: 0 0 20px var(--accent-glow); }
    50% { box-shadow: 0 0 40px var(--accent-glow), 0 0 60px rgba(0,212,255,0.2); }
}

.progress-bar {
    width: 240px;
    height: 4px;
    background: rgba(255,255,255,0.08);
    border-radius: 2px;
    margin: 0 auto;
    overflow: hidden;
}
.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent), #a855f7);
    border-radius: 2px;
    transition: width 0.4s ease;
}

/* ── Alert Overlay ─────────────────────── */
#alert-overlay {
    position: fixed;
    inset: 0;
    z-index: 900;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 20, 60, 0.12);
    animation: alert-bg-flash 0.5s ease-in-out infinite alternate;
}
@keyframes alert-bg-flash {
    from { background: rgba(255, 20, 60, 0.08); }
    to { background: rgba(255, 20, 60, 0.25); }
}
.alert-content {
    text-align: center;
    position: relative;
    z-index: 2;
}
.alert-pulse-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 200px;
    height: 200px;
    transform: translate(-50%, -50%);
    border: 2px solid var(--danger);
    border-radius: 50%;
    animation: pulse-ring 1.5s ease-out infinite;
    pointer-events: none;
}
.alert-pulse-ring.delay-1 { animation-delay: 0.5s; }
.alert-pulse-ring.delay-2 { animation-delay: 1s; }
@keyframes pulse-ring {
    0% { width: 100px; height: 100px; opacity: 1; }
    100% { width: 400px; height: 400px; opacity: 0; }
}
.alert-icon-large { font-size: 5rem; animation: alert-shake 0.3s ease-in-out infinite; pointer-events: none; }
#dismiss-alert-btn { position: relative; z-index: 10; }
@keyframes alert-shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px) rotate(-5deg); }
    75% { transform: translateX(10px) rotate(5deg); }
}
.alert-title {
    font-size: 4rem;
    font-weight: 900;
    color: #fff;
    text-shadow: 0 0 40px var(--danger), 0 0 80px rgba(255,51,102,0.5);
    animation: alert-text-pulse 0.8s ease-in-out infinite alternate;
}
@keyframes alert-text-pulse {
    from { opacity: 0.7; transform: scale(0.98); }
    to { opacity: 1; transform: scale(1.02); }
}
.alert-subtitle {
    font-size: 1.2rem;
    color: rgba(255,255,255,0.7);
    margin: 12px 0 28px;
}

/* ── Header ────────────────────────────── */
#main-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    border-bottom: 1px solid var(--glass-border);
    background: rgba(6, 6, 15, 0.8);
    backdrop-filter: blur(16px);
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo-icon { font-size: 1.6rem; }
.logo-text {
    font-size: 1.3rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.status-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}
.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    animation: status-pulse 2s ease-in-out infinite;
}
@keyframes status-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}
.status-idle { background: rgba(255,255,255,0.06); color: var(--text-secondary); }
.status-idle .status-dot { background: var(--text-muted); }
.status-active { background: rgba(0,255,136,0.1); color: var(--success); border: 1px solid rgba(0,255,136,0.2); }
.status-active .status-dot { background: var(--success); }
.status-warning { background: rgba(255,170,0,0.1); color: var(--warning); border: 1px solid rgba(255,170,0,0.2); }
.status-warning .status-dot { background: var(--warning); }
.status-danger { background: rgba(255,51,102,0.15); color: var(--danger); border: 1px solid rgba(255,51,102,0.25); }
.status-danger .status-dot { background: var(--danger); animation: status-pulse 0.5s ease-in-out infinite; }

/* ── Main Content ──────────────────────── */
#main-content {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 16px;
    padding: 16px 24px;
    height: calc(100vh - 64px - 210px);
    min-height: 350px;
}

.panel { display: flex; flex-direction: column; overflow: hidden; }
.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    border-bottom: 1px solid var(--glass-border);
}
.panel-header h2 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
}
.panel-note {
    padding: 8px 18px;
    font-size: 0.75rem;
    color: var(--text-muted);
    border-top: 1px solid var(--glass-border);
}

/* Video Panel */
#video-wrapper {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}
#drop-zone {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}
.drop-visual {
    text-align: center;
    padding: 32px;
}
.drop-icon {
    color: var(--text-muted);
    margin-bottom: 16px;
    transition: var(--transition);
}
.drop-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}
.drop-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 16px;
}
#drop-zone.drag-over {
    background: rgba(0,212,255,0.06);
    border: 2px dashed var(--accent);
    border-radius: var(--radius-md);
}
#drop-zone.drag-over .drop-icon { color: var(--accent); transform: translateY(-4px); }

#media-player {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: #000;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

/* Monitor Panel */
#camera-container {
    position: relative;
    width: 100%;
    aspect-ratio: 4/3;
    background: #000;
    overflow: hidden;
    border-radius: 0;
}
#webcam {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scaleX(-1);
}
#face-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    transform: scaleX(-1);
}
#cam-overlay-info {
    position: absolute;
    top: 8px;
    left: 8px;
    right: 8px;
    display: flex;
    justify-content: space-between;
    font-size: 0.72rem;
    font-weight: 600;
    font-family: 'SF Mono', 'Fira Code', monospace;
}
#cam-ear-display, #cam-fps-display {
    background: rgba(0,0,0,0.6);
    padding: 3px 8px;
    border-radius: 4px;
    color: var(--success);
}
#no-camera-msg {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    background: var(--bg-surface);
}
.no-cam-icon { font-size: 2.5rem; opacity: 0.5; }
#no-camera-msg p { color: var(--text-secondary); font-size: 0.9rem; }

/* Gauge */
#gauge-section {
    padding: 14px 18px;
    display: flex;
    align-items: center;
    gap: 20px;
    border-top: 1px solid var(--glass-border);
}
.gauge-wrapper {
    width: 100px;
    height: 100px;
    position: relative;
    flex-shrink: 0;
}
.gauge-svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.gauge-track {
    fill: none;
    stroke: rgba(255,255,255,0.06);
    stroke-width: 8;
}
.gauge-arc {
    fill: none;
    stroke: var(--success);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 502.65;
    stroke-dashoffset: 502.65;
    transition: stroke-dashoffset 0.5s ease, stroke 0.5s ease;
}
.gauge-center-text {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
.gauge-value {
    font-size: 1.6rem;
    font-weight: 800;
    line-height: 1;
    color: var(--success);
    transition: color 0.5s ease;
}
.gauge-label {
    font-size: 0.6rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.ear-readouts {
    display: flex;
    gap: 16px;
    flex: 1;
}
.ear-readout {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}
.ear-label {
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}
.ear-val {
    font-size: 1.1rem;
    font-weight: 700;
    font-family: 'SF Mono', 'Fira Code', monospace;
    color: var(--text-secondary);
}
.ear-val.highlight { color: var(--accent); font-size: 1.3rem; }

/* Drowsiness Badge */
.drowsiness-badge {
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}
.drowsiness-badge.level-alert {
    background: rgba(0,255,136,0.12);
    color: var(--success);
}
.drowsiness-badge.level-warn {
    background: rgba(255,170,0,0.12);
    color: var(--warning);
}
.drowsiness-badge.level-danger {
    background: rgba(255,51,102,0.15);
    color: var(--danger);
    animation: badge-pulse 0.8s ease-in-out infinite alternate;
}
@keyframes badge-pulse { from { opacity: 0.7; } to { opacity: 1; } }

/* ── Bottom Bar ────────────────────────── */
#bottom-bar {
    padding: 12px 24px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    border-top: 1px solid var(--glass-border);
    background: rgba(6, 6, 15, 0.7);
    backdrop-filter: blur(16px);
}

#stats-row {
    display: flex;
    gap: 10px;
}
.stat-card {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: var(--radius-md);
}
.stat-icon { font-size: 1.2rem; }
.stat-info { display: flex; flex-direction: column; }
.stat-value {
    font-size: 1rem;
    font-weight: 700;
    font-family: 'SF Mono', 'Fira Code', monospace;
    color: var(--text-primary);
}
.stat-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

#controls-row {
    display: flex;
    gap: 10px;
    justify-content: center;
}

#graph-container {
    height: 50px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--glass-border);
}
#ear-graph { width: 100%; height: 100%; display: block; }

/* ── Modals ────────────────────────────── */
.modal {
    position: fixed;
    inset: 0;
    z-index: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(8px);
    animation: modal-in 0.25s ease;
}
@keyframes modal-in { from { opacity: 0; } to { opacity: 1; } }

.modal-content {
    background: var(--bg-surface);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    width: 440px;
    max-height: 80vh;
    overflow-y: auto;
    animation: modal-content-in 0.3s ease;
}
@keyframes modal-content-in {
    from { transform: scale(0.95) translateY(10px); opacity: 0; }
    to { transform: scale(1) translateY(0); opacity: 1; }
}
.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px 16px;
    border-bottom: 1px solid var(--glass-border);
}
.modal-header h2 { font-size: 1.1rem; font-weight: 700; }
.close-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: rgba(255,255,255,0.06);
    color: var(--text-secondary);
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
}
.close-btn:hover { background: rgba(255,255,255,0.12); color: var(--text-primary); }
.modal-body { padding: 20px 24px 28px; }

.setting-group {
    margin-bottom: 20px;
}
.setting-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}
.setting-hint {
    font-weight: 400;
    color: var(--text-muted);
    font-size: 0.78rem;
}
.slider-row {
    display: flex;
    align-items: center;
    gap: 12px;
}
.slider-row input[type="range"] { flex: 1; }
.slider-value {
    min-width: 42px;
    text-align: right;
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent);
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    border-radius: 3px;
    background: rgba(255,255,255,0.08);
    outline: none;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    box-shadow: 0 0 10px var(--accent-glow);
}

select {
    width: 100%;
    padding: 10px 14px;
    background: rgba(255,255,255,0.06);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.85rem;
    outline: none;
}
select:focus { border-color: var(--accent); }

.toggle-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}
.toggle-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: rgba(255,255,255,0.04);
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
}
.toggle-item input[type="checkbox"] {
    accent-color: var(--accent);
    width: 16px;
    height: 16px;
}

/* ── Calibration ───────────────────────── */
.calibration-content {
    text-align: center;
    padding: 32px 28px;
}
.calibration-content h2 { margin-bottom: 8px; }
#calibration-instruction {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 24px;
}
.calibration-progress {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 28px;
}
.calibration-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    color: var(--text-muted);
    font-size: 0.78rem;
    font-weight: 600;
}
.step-num {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(255,255,255,0.06);
    font-size: 0.82rem;
    font-weight: 700;
}
.calibration-step.active .step-num {
    background: var(--accent);
    color: #000;
    box-shadow: 0 0 20px var(--accent-glow);
}
.calibration-step.done .step-num {
    background: var(--success);
    color: #000;
}
.calibration-step.active, .calibration-step.done { color: var(--text-primary); }

.calibration-timer {
    width: 100px;
    height: 100px;
    margin: 0 auto 20px;
    position: relative;
}
.calibration-timer svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.cal-timer-bg { fill: none; stroke: rgba(255,255,255,0.06); stroke-width: 4; }
.cal-timer-fill {
    fill: none;
    stroke: var(--accent);
    stroke-width: 4;
    stroke-linecap: round;
    stroke-dasharray: 251.33;
    stroke-dashoffset: 251.33;
    transition: stroke-dashoffset 1s linear;
}
#cal-timer-text {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent);
}

/* ── Responsive ────────────────────────── */
@media (max-width: 900px) {
    #main-content {
        grid-template-columns: 1fr;
        height: auto;
        overflow-y: auto;
    }
    #stats-row { flex-wrap: wrap; }
    .stat-card { min-width: calc(50% - 5px); }
}