/* ==========================================================================
   EmotionSense — Design System & Custom Stylesheet
   Clinical, Editorial, Lab Instrument UI Aesthetic
   ========================================================================== */

:root {
    /* Color Palette: Warm Paper & Muted Slate Ink */
    --bg-paper: #FAFAF8;
    --bg-card: #FFFFFF;
    --bg-subtle: #F4F3EF;
    --bg-hover: #EFECE6;

    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #64748B;

    --border-hairline: rgba(0, 0, 0, 0.08);
    --border-solid: #E2E8F0;
    --border-dark: #334155;

    /* Single Restrained Accent Color Scale */
    --accent-primary: #1E293B;  /* Muted Slate Ink Blue */
    --accent-subtle: #334155;
    --accent-bar-top: #1E293B;
    --accent-bar-mid: #475569;
    --accent-bar-low: #94A3B8;

    /* Status Indicators */
    --status-active: #15803D;
    --status-warning: #B45309;
    --status-inactive: #64748B;

    /* Typography Fonts */
    --font-sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'IBM Plex Mono', SFMono-Regular, Consolas, 'Liberation Mono', monospace;

    /* Transitions & Focus */
    --transition-fast: 0.15s ease;
    --transition-smooth: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
    background-color: var(--bg-paper);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 14px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.mono {
    font-family: var(--font-mono);
}

/* Header Bar */
.app-header {
    background-color: var(--bg-paper);
    border-bottom: 1px solid var(--border-hairline);
    padding: 12px 24px;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.brand-title {
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--accent-primary);
}

.brand-sub {
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.12em;
    color: var(--text-muted);
}

.header-status {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 12px;
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--status-inactive);
    transition: background-color var(--transition-fast);
}

.status-indicator.live {
    background-color: var(--status-active);
}

.status-text {
    font-weight: 500;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.header-divider {
    color: var(--border-solid);
}

.header-time {
    color: var(--text-muted);
}

/* Workspace Container (Two Zone Layout) */
.workspace-container {
    max-width: 1400px;
    width: 100%;
    margin: 24px auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 32px;
    flex: 1;
}

@media (max-width: 1024px) {
    .workspace-container {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}

/* Common Panel Header */
.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-hairline);
}

.panel-title {
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--text-muted);
}

.panel-subtitle {
    font-size: 10px;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

.panel-badge {
    font-size: 11px;
    font-weight: 500;
    color: var(--text-secondary);
    background-color: var(--bg-subtle);
    padding: 2px 8px;
    border: 1px solid var(--border-hairline);
}

/* Zone 1: Camera Viewport */
.zone-viewport {
    display: flex;
    flex-direction: column;
}

.video-frame-container {
    position: relative;
    width: 100%;
    aspect-ratio: 4 / 3;
    background-color: #12161A;
    border: 1px solid var(--border-hairline);
    overflow: hidden;
}

#webcamVideo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

#overlayCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

/* Viewport Overlays */
.viewport-overlay {
    position: absolute;
    inset: 0;
    background-color: rgba(250, 250, 248, 0.95);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 32px;
    text-align: center;
    transition: opacity var(--transition-smooth);
}

.overlay-card {
    max-width: 360px;
}

.overlay-icon {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.overlay-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.overlay-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.face-status-banner {
    position: absolute;
    bottom: 12px;
    left: 12px;
    background-color: rgba(15, 23, 42, 0.85);
    color: #FFFFFF;
    padding: 4px 10px;
    font-size: 11px;
    letter-spacing: 0.08em;
    border: 1px solid rgba(255, 255, 255, 0.15);
    transition: opacity var(--transition-fast);
}

.face-status-banner.hidden {
    opacity: 0;
    pointer-events: none;
}

/* Viewport Controls */
.viewport-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 16px;
    gap: 16px;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: var(--accent-primary);
    color: #FFFFFF;
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.08em;
    padding: 10px 20px;
    border: 1px solid var(--accent-primary);
    cursor: pointer;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.btn-primary:hover {
    background-color: var(--accent-subtle);
    border-color: var(--accent-subtle);
}

.btn-primary.active {
    background-color: #991B1B;
    border-color: #991B1B;
}

.smoothing-control {
    display: flex;
    align-items: center;
    gap: 8px;
}

.control-label {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--text-muted);
}

.control-select {
    background-color: var(--bg-paper);
    color: var(--text-primary);
    font-size: 12px;
    padding: 6px 10px;
    border: 1px solid var(--border-solid);
    outline: none;
    cursor: pointer;
}

.control-select:focus {
    border-color: var(--accent-primary);
}

/* Privacy Note */
.privacy-note {
    margin-top: 16px;
    padding: 12px 16px;
    background-color: var(--bg-subtle);
    border: 1px solid var(--border-hairline);
    display: flex;
    gap: 12px;
    font-size: 12px;
    color: var(--text-secondary);
}

.privacy-icon {
    font-size: 14px;
}

.privacy-note strong {
    color: var(--text-primary);
    letter-spacing: 0.04em;
}

/* Zone 2: Analytics Readout */
.zone-analytics {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Dominant Emotion Card */
.dominant-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-hairline);
    padding: 20px 24px;
}

.card-label {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.12em;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.dominant-content {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 12px;
}

.dominant-name {
    font-size: 28px;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--accent-primary);
}

.dominant-score {
    font-size: 28px;
    font-weight: 600;
    color: var(--accent-primary);
}

.dominant-meta {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    color: var(--text-muted);
    border-top: 1px solid var(--border-hairline);
    padding-top: 8px;
}

.dominant-meta strong {
    color: var(--text-primary);
}

.low-confidence-hint {
    margin-top: 10px;
    padding: 6px 12px;
    background-color: #FEF3C7;
    border: 1px solid #F59E0B;
    color: #92400E;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.05em;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: opacity var(--transition-fast);
}

.low-confidence-hint.hidden {
    display: none;
}

/* Meters Panel */
.meters-panel {
    background-color: var(--bg-card);
    border: 1px solid var(--border-hairline);
    padding: 20px 24px;
}

.meters-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.meter-row {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.meter-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
}

.meter-label {
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--text-secondary);
}

.meter-label.top-rank {
    color: var(--accent-primary);
}

.meter-pct {
    font-weight: 500;
    color: var(--text-primary);
}

.meter-track {
    width: 100%;
    height: 6px;
    background-color: var(--bg-subtle);
    border-radius: 0px;
    overflow: hidden;
}

.meter-fill {
    height: 100%;
    background-color: var(--accent-bar-mid);
    width: 0%;
    transition: width 0.12s linear, background-color var(--transition-fast);
}

.meter-fill.top-rank {
    background-color: var(--accent-bar-top);
}

.meter-fill.low-rank {
    background-color: var(--accent-bar-low);
}

/* Telemetry Panel */
.telemetry-panel {
    background-color: var(--bg-card);
    border: 1px solid var(--border-hairline);
    padding: 16px 24px;
}

.telemetry-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    padding-top: 8px;
}

@media (max-width: 640px) {
    .telemetry-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.telemetry-item {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.tel-label {
    font-size: 10px;
    color: var(--text-muted);
    letter-spacing: 0.06em;
}

.tel-value {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
}

/* About Section */
.about-section {
    background-color: var(--bg-paper);
    border-top: 1px solid var(--border-hairline);
    padding: 48px 24px;
    margin-top: 40px;
}

.about-container {
    max-width: 1400px;
    margin: 0 auto;
}

.about-heading {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.12em;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.stats-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 40px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-hairline);
    padding: 20px 24px;
}

@media (max-width: 768px) {
    .stats-row {
        grid-template-columns: repeat(2, 1fr);
    }
}

.stat-box {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-label {
    font-size: 10px;
    letter-spacing: 0.08em;
    color: var(--text-muted);
}

.stat-value {
    font-size: 16px;
    font-weight: 600;
    color: var(--accent-primary);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

@media (max-width: 768px) {
    .about-grid {
        grid-template-columns: 1fr;
    }
}

.about-block h3 {
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.about-block p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Footer Credit Line */
.app-footer {
    border-top: 1px solid var(--border-hairline);
    padding: 24px;
    text-align: center;
    background-color: var(--bg-paper);
}

.footer-credit {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 400;
}