/* ============================================
   DFA A1 Ramp Test — Tremayne Performance
   Design System: Dark Technical Interface
   ============================================ */

/* --- Full-page effort overlay (TTE, no-pedaling, cooldown transition) --- */
.effort-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: overlayFadeIn 0.3s ease-out;
}
@keyframes overlayFadeIn {
    0% { opacity: 0; }
    100% { opacity: 1; }
}
.effort-overlay-content {
    text-align: center;
    padding: 2rem;
    max-width: 400px;
    width: 90%;
}
.effort-overlay-label {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: #ef4444;
    margin-bottom: 1.5rem;
}
.effort-overlay-timer {
    font-family: 'Montserrat', sans-serif;
    font-size: 4rem;
    font-weight: 700;
    color: #fff;
    line-height: 1;
}
.effort-overlay-total {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 1.5rem;
}
.effort-overlay-target {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.4);
    margin-bottom: 1rem;
}
.effort-overlay-hint {
    color: rgba(255, 255, 255, 0.35);
    font-size: 0.75rem;
    margin-top: 0.5rem;
    letter-spacing: 0.03em;
}
.btn-tte-done {
    display: inline-block;
    width: 100%;
    max-width: 400px;
    padding: 1.8rem 2rem;
    font-family: 'Montserrat', sans-serif;
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: #fff;
    background: linear-gradient(135deg, #dc2626, #ef4444);
    border: 2px solid rgba(239, 68, 68, 0.5);
    border-radius: 16px;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.2s, background 0.2s;
    box-shadow: 0 0 30px rgba(239, 68, 68, 0.3);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    user-select: none;
    margin-top: 1.5rem;
}
.btn-tte-done:hover {
    transform: scale(1.02);
    box-shadow: 0 0 40px rgba(239, 68, 68, 0.5);
}
.btn-tte-done:active {
    transform: scale(0.97);
    background: linear-gradient(135deg, #b91c1c, #dc2626);
}
.btn-no-pedaling-resume {
    display: inline-block;
    width: 100%;
    max-width: 400px;
    padding: 1rem 1.5rem;
    font-family: 'Montserrat', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.7);
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    cursor: pointer;
    margin-top: 1rem;
    transition: background 0.2s, border-color 0.2s;
}
.btn-no-pedaling-resume:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.4);
}

/* --- Power warning (recovery phase, power too high) --- */
.power-warning {
    text-align: center;
    padding: 0.6rem 1rem;
    margin: 0.5rem 20px;
    background: rgba(251, 191, 36, 0.15);
    border: 1px solid rgba(251, 191, 36, 0.3);
    border-radius: 8px;
    color: #fbbf24;
    font-family: 'Montserrat', sans-serif;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    animation: warningPulse 1.5s ease-in-out infinite;
}
@keyframes warningPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

/* --- Coach Navigation Bar --- */
.top-nav {
    background: rgba(14, 15, 18, 0.97);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 200;
    padding: 0 20px;
}
.top-nav-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    height: 48px;
    gap: 1.5rem;
}
.top-nav-brand {
    text-decoration: none;
    flex-shrink: 0;
    display: flex;
    align-items: center;
}
.top-nav-logo {
    height: 28px;
    width: auto;
}
.top-nav-links {
    display: flex;
    gap: 0.25rem;
    flex: 1;
}
.top-nav-links a {
    color: #9ca3af;
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 500;
    padding: 0.35rem 0.75rem;
    border-radius: 8px;
    transition: color 0.2s, background 0.2s;
}
.top-nav-links a:hover {
    color: #e5e7eb;
    background: rgba(59, 130, 246, 0.15);
}
.top-nav-links a.active {
    color: #3b82f6;
    background: rgba(59, 130, 246, 0.15);
}

.top-nav-logout {
    background: none;
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #9ca3af;
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.3rem 0.75rem;
    border-radius: 8px;
    cursor: pointer;
    transition: color 0.2s, border-color 0.2s;
    flex-shrink: 0;
}
.top-nav-logout:hover {
    color: #ef4444;
    border-color: #ef4444;
}
.top-nav-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-left: auto;
}

#login-screen .card {
    padding: 2rem;
}
#login-screen .btn-start {
    padding: 1rem;
}
#login-screen .form-group label {
    font-size: 0.75rem;
}
#login-screen input[type="email"],
#login-screen input[type="text"] {
    font-size: 1rem;
}

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

:root {
    /* Backgrounds */
    --bg-base: #0e0f12;
    --bg-elevated: #141620;
    --bg-card: rgba(22, 24, 32, 0.85);
    --bg-card-hover: rgba(28, 30, 40, 0.9);
    --bg-input: rgba(16, 18, 26, 0.9);

    /* Accent — Bike */
    --bike-primary: #3b82f6;
    --bike-dim: rgba(59, 130, 246, 0.15);
    --bike-glow: rgba(59, 130, 246, 0.25);
    --bike-dark: #1a2540;

    /* Accent — Run */
    --run-primary: #22c55e;
    --run-dim: rgba(34, 197, 94, 0.15);
    --run-glow: rgba(34, 197, 94, 0.25);
    --run-dark: #0f2918;

    /* Semantic */
    --red: #ef4444;
    --red-dim: rgba(239, 68, 68, 0.15);
    --amber: #fbbf24;
    --amber-dim: rgba(251, 191, 36, 0.15);
    --purple: #8b5cf6;
    --purple-dim: rgba(139, 92, 246, 0.15);
    --cyan: #38bdf8;

    /* Text */
    --text-primary: #e5e7eb;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --text-dim: #4b5563;

    /* Borders */
    --border: rgba(255, 255, 255, 0.06);
    --border-accent: rgba(255, 255, 255, 0.1);

    /* Radii */
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;

    /* Transitions */
    --ease: cubic-bezier(0.4, 0, 0.2, 1);

    /* Active sport accent (toggled by JS) */
    --accent: var(--bike-primary);
    --accent-dim: var(--bike-dim);
    --accent-glow: var(--bike-glow);
    --accent-dark: var(--bike-dark);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-base);
    color: var(--text-primary);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

body.sport-run {
    --accent: var(--run-primary);
    --accent-dim: var(--run-dim);
    --accent-glow: var(--run-glow);
    --accent-dark: var(--run-dark);
}

/* --- Typography --- */
h1, h2, h3 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

/* --- Screens --- */
.screen {
    display: none;
    max-width: 820px;
    margin: 0 auto;
    padding: 0 20px 40px;
}
.screen.active {
    display: block;
}

.status-chip {
    font-family: 'Inter', sans-serif;
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    padding: 4px 12px;
    border-radius: 20px;
    text-transform: uppercase;
}
.status-chip.disconnected {
    background: var(--red-dim);
    color: var(--red);
}
.status-chip.partial {
    background: var(--amber-dim);
    color: var(--amber);
}
.status-chip.connected {
    background: var(--accent-dim);
    color: var(--accent);
}

/* --- Cards --- */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-top: 20px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: border-color 0.3s var(--ease);
}
.card:hover {
    border-color: var(--border-accent);
}
.card-title {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

/* --- Sport Toggle --- */
.sport-toggle {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}
.sport-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 24px 16px;
    background: var(--bg-input);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-muted);
    font-family: 'Montserrat', sans-serif;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: all 0.3s var(--ease);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    user-select: none;
}
.sport-btn .sport-icon {
    width: 36px;
    height: 36px;
}
.sport-btn:hover {
    border-color: var(--border-accent);
    color: var(--text-secondary);
}
.sport-btn.active {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-dim);
    box-shadow: 0 0 20px var(--accent-glow);
}

/* --- Forms --- */
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.form-group.full-width {
    grid-column: 1 / -1;
}
.form-group label {
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    text-transform: uppercase;
}
.form-group input {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
    transition: border-color 0.2s var(--ease);
    outline: none;
}
.form-group input::placeholder {
    color: var(--text-dim);
}
.form-group input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-dim);
}

/* --- Device Slots --- */
.device-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.device-slot {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: border-color 0.3s var(--ease);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}
.device-slot.connected {
    border-color: var(--accent);
    border-left: 4px solid var(--accent);
}
.device-icon-wrap {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.device-icon-wrap.bike-accent {
    background: var(--bike-dim);
    color: var(--bike-primary);
}
.device-icon-wrap.run-accent {
    background: var(--run-dim);
    color: var(--run-primary);
}
.device-icon {
    width: 22px;
    height: 22px;
}
.device-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.device-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-primary);
}
.device-name {
    font-size: 0.7rem;
    color: var(--text-muted);
}
.device-name.active {
    color: var(--accent);
}
.btn-connect {
    padding: 12px 20px;
    min-height: 44px;
    min-width: 44px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    font-family: 'Inter', sans-serif;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    cursor: pointer;
    transition: all 0.2s var(--ease);
    text-transform: uppercase;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    user-select: none;
}
.btn-connect:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-dim);
}
.btn-connect.connected {
    background: var(--accent-dim);
    border-color: var(--accent);
    color: var(--accent);
}
.device-note {
    font-size: 0.7rem;
    color: var(--text-dim);
    margin-top: 12px;
    font-style: italic;
}

/* --- Protocol Preview --- */
.protocol-bar {
    display: flex;
    height: 32px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: 16px;
}
.protocol-segment {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.55rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.8);
    transition: opacity 0.3s var(--ease);
}
.protocol-segment.warmup { background: var(--bike-primary); }
.protocol-segment.ramp { background: var(--purple); }
.protocol-segment.recovery { background: var(--run-primary); }
.protocol-segment.max-effort { background: var(--red); }
.protocol-segment.cooldown { background: var(--text-dim); }

body.sport-run .protocol-segment.warmup { background: var(--run-primary); }
body.sport-run .protocol-segment.ramp { background: var(--purple); }
body.sport-run .protocol-segment.recovery { background: var(--bike-primary); }
body.sport-run .protocol-segment.max-effort { background: var(--red); }

.protocol-stages {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 8px;
}
.stage-chip {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.7rem;
}
.stage-chip .stage-num {
    font-weight: 600;
    color: var(--text-secondary);
}
.stage-chip .stage-target {
    color: var(--accent);
    font-weight: 500;
    font-variant-numeric: tabular-nums;
}

/* --- Start Button --- */
.start-section {
    margin-top: 28px;
    text-align: center;
}
.btn-start {
    width: 100%;
    max-width: 400px;
    padding: 18px 32px;
    background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 70%, white));
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.3s var(--ease);
    position: relative;
    overflow: hidden;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    user-select: none;
}
.btn-start:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}
.btn-start:not(:disabled):hover {
    box-shadow: 0 0 30px var(--accent-glow);
    transform: translateY(-1px);
}
.btn-start-text {
    display: block;
    font-family: 'Montserrat', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    color: white;
    text-transform: uppercase;
}
.btn-start-sub {
    display: block;
    font-size: 0.65rem;
    color: rgba(255,255,255,0.6);
    margin-top: 4px;
    letter-spacing: 0.04em;
}

.btn-new-test {
    padding: 14px 40px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-family: 'Montserrat', sans-serif;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    cursor: pointer;
    transition: all 0.3s var(--ease);
    text-transform: uppercase;
}
.btn-new-test:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* ============================================
   TEST SCREEN
   ============================================ */

/* --- Metrics Bar --- */
.metrics-bar {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1px;
    background: var(--border);
    border-radius: var(--radius) var(--radius) 0 0;
    overflow: hidden;
    margin-top: 20px;
}
.metric-cell {
    background: var(--bg-card);
    padding: 14px 16px;
    text-align: center;
}
.metric-label {
    display: block;
    font-size: 0.6rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 4px;
}
.metric-value {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

/* --- Primary Metrics --- */
.primary-metrics {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    background: var(--border);
}
.big-metric {
    background: var(--bg-card);
    padding: 28px 20px;
    text-align: center;
    position: relative;
}
.big-value {
    font-family: 'Montserrat', sans-serif;
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1;
    font-variant-numeric: tabular-nums;
}
.big-unit {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-left: 4px;
}
.big-label {
    display: block;
    font-size: 0.6rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-top: 8px;
}
.power-metric .big-value { color: var(--accent); }
.hr-metric .big-value { color: var(--red); }

.target-row {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--border);
}
.target-label {
    font-size: 0.55rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--text-dim);
    text-transform: uppercase;
    margin-right: 6px;
}
.target-value {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-secondary);
}
.target-unit {
    font-size: 0.7rem;
    color: var(--text-dim);
}

/* --- Secondary Metrics --- */
.secondary-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1px;
    background: var(--border);
    border-radius: 0 0 var(--radius) var(--radius);
    overflow: hidden;
    margin-bottom: 20px;
}
.small-metric {
    background: var(--bg-card);
    padding: 14px 12px;
    text-align: center;
}
.small-label {
    display: block;
    font-size: 0.55rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--text-dim);
    text-transform: uppercase;
    margin-bottom: 4px;
}
.small-value {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}
.small-unit {
    display: block;
    font-size: 0.55rem;
    color: var(--text-dim);
    margin-top: 2px;
}

/* --- Progress --- */
.progress-section {
    margin-bottom: 16px;
}
.progress-bar-container {
    height: 6px;
    background: var(--bg-input);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 8px;
}
.progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent), var(--purple));
    border-radius: 3px;
    transition: width 1s linear;
}
.progress-segments {
    display: flex;
    gap: 2px;
    height: 20px;
}
.progress-seg {
    flex: 1;
    border-radius: 3px;
    font-size: 0.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.5);
    letter-spacing: 0.04em;
    transition: all 0.3s var(--ease);
}
.progress-seg.warmup { background: rgba(59, 130, 246, 0.2); }
.progress-seg.ramp { background: rgba(139, 92, 246, 0.2); }
.progress-seg.recovery { background: rgba(34, 197, 94, 0.2); }
.progress-seg.max-effort { background: rgba(239, 68, 68, 0.2); }
.progress-seg.cooldown { background: rgba(107, 114, 128, 0.15); }
.progress-seg.active {
    outline: 2px solid var(--accent);
    outline-offset: -1px;
    color: rgba(255,255,255,0.9);
}
.progress-seg.done {
    opacity: 0.4;
}

/* --- Chart --- */
.chart-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 16px;
    height: 240px;
}
.chart-section canvas {
    width: 100% !important;
    height: 100% !important;
}

/* --- HRV Status --- */
.hrv-status-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
}
.hrv-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
}
.hrv-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-dim);
}
.hrv-dot.receiving {
    background: var(--run-primary);
    box-shadow: 0 0 8px rgba(34, 197, 94, 0.5);
    animation: pulse-dot 1.5s ease infinite;
}
.hrv-dot.warning {
    background: var(--amber);
}
@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}
.hrv-text {
    font-size: 0.7rem;
    color: var(--text-secondary);
}
.hrv-stats {
    display: flex;
    gap: 16px;
    font-size: 0.65rem;
    font-weight: 500;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

/* --- Controls --- */
.test-controls {
    display: flex;
    gap: 12px;
    justify-content: center;
}
.btn-control {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    min-height: 44px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    color: var(--text-secondary);
    font-family: 'Inter', sans-serif;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    cursor: pointer;
    transition: all 0.2s var(--ease);
    text-transform: uppercase;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    user-select: none;
}
.btn-control svg {
    width: 16px;
    height: 16px;
}
.btn-control:hover {
    border-color: var(--text-muted);
    color: var(--text-primary);
}
.btn-stop:hover {
    border-color: var(--red);
    color: var(--red);
    background: var(--red-dim);
}
.btn-pause.paused {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-dim);
}

/* ============================================
   RESULTS SCREEN
   ============================================ */
.results-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}
.result-item {
    text-align: center;
    padding: 16px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}
.result-label {
    display: block;
    font-size: 0.6rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 6px;
}
.result-value {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

/* Quality Bar */
.quality-bar {
    height: 8px;
    background: var(--bg-input);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 12px;
}
.quality-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.5s var(--ease);
}
.quality-fill.good { background: var(--run-primary); }
.quality-fill.moderate { background: var(--amber); }
.quality-fill.poor { background: var(--red); }
.quality-note {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Export */
.export-note {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 16px;
}
.export-buttons {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}
.btn-export {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    min-height: 44px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    cursor: pointer;
    transition: all 0.2s var(--ease);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}
.btn-export:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-dim);
}

/* ============================================
   RESPONSIVE — Mobile-first testing UI
   ============================================ */

/* Safe area insets for notched phones */
@supports (padding: env(safe-area-inset-bottom)) {
    .screen {
        padding-left: max(16px, env(safe-area-inset-left));
        padding-right: max(16px, env(safe-area-inset-right));
        padding-bottom: max(40px, env(safe-area-inset-bottom));
    }
    .top-nav {
        padding-left: max(16px, env(safe-area-inset-left));
        padding-right: max(16px, env(safe-area-inset-right));
    }
}

@media (max-width: 640px) {
    /* --- Nav bar --- */
    .top-nav {
        padding: 0 12px;
    }
    .top-nav-inner {
        height: 44px;
        gap: 0.75rem;
    }
    .top-nav-logo {
        height: 22px;
    }
    .top-nav-links a {
        font-size: 0.7rem;
        padding: 0.3rem 0.5rem;
    }
    .top-nav-logout {
        font-size: 0.65rem;
        padding: 0.25rem 0.6rem;
    }
    .top-nav-right {
        gap: 0.5rem;
    }

    /* --- Layout --- */
    .screen {
        padding: 0 12px 40px;
    }
    .card {
        padding: 16px;
        margin-top: 14px;
        border-radius: 10px;
    }
    .card-title {
        font-size: 0.65rem;
        margin-bottom: 14px;
    }

    /* --- Login --- */
    #login-screen .card {
        padding: 1.5rem;
        margin: 1rem auto;
    }

    /* --- Setup screen --- */
    .sport-toggle {
        gap: 8px;
    }
    .sport-btn {
        padding: 16px 12px;
        gap: 8px;
        font-size: 0.7rem;
    }
    .sport-btn .sport-icon {
        width: 28px;
        height: 28px;
    }

    .form-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    .form-group.full-width {
        grid-column: 1;
    }
    .form-group label {
        font-size: 0.65rem;
    }
    .form-group input {
        font-size: 1rem;
        padding: 12px 14px;
    }

    /* Device connection — larger tap targets */
    .device-grid {
        gap: 8px;
    }
    .device-slot {
        padding: 12px;
        gap: 10px;
        flex-wrap: wrap;
    }
    .device-icon-wrap {
        width: 36px;
        height: 36px;
        border-radius: 8px;
    }
    .device-icon {
        width: 18px;
        height: 18px;
    }
    .btn-connect {
        width: 100%;
        padding: 12px 16px;
        font-size: 0.75rem;
        text-align: center;
    }
    .device-label {
        font-size: 0.8rem;
    }
    .device-name {
        font-size: 0.7rem;
    }
    .device-note {
        font-size: 0.65rem;
        margin-top: 8px;
    }

    /* Protocol preview */
    .protocol-bar {
        height: 26px;
        margin-bottom: 10px;
    }
    .protocol-segment {
        font-size: 0.45rem;
    }
    .protocol-stages {
        grid-template-columns: repeat(auto-fill, minmax(85px, 1fr));
        gap: 6px;
    }
    .stage-chip {
        padding: 6px 8px;
        font-size: 0.65rem;
    }

    /* Start button */
    .start-section {
        margin-top: 20px;
    }
    .btn-start {
        padding: 14px 24px;
    }
    .btn-start-text {
        font-size: 0.9rem;
    }
    .btn-start-sub {
        font-size: 0.6rem;
    }

    /* --- Test screen --- */
    .metrics-bar {
        grid-template-columns: 1fr 1fr 1fr;
    }
    .metric-cell {
        padding: 10px 8px;
    }
    .metric-label {
        font-size: 0.5rem;
    }
    .metric-value {
        font-size: 0.9rem;
    }

    .primary-metrics {
        grid-template-columns: 1fr 1fr;
    }
    .big-value {
        font-size: 2.4rem;
    }
    .big-metric {
        padding: 16px 10px;
    }
    .big-unit {
        font-size: 0.7rem;
    }
    .big-label {
        font-size: 0.5rem;
        margin-top: 4px;
    }
    .target-row {
        margin-top: 6px;
        padding-top: 6px;
    }
    .target-value {
        font-size: 1rem;
    }

    .secondary-metrics {
        grid-template-columns: repeat(2, 1fr);
    }
    .small-metric {
        padding: 10px 6px;
    }
    .small-label {
        font-size: 0.5rem;
    }
    .small-value {
        font-size: 1rem;
    }

    /* Progress */
    .progress-bar-container {
        height: 5px;
        margin-bottom: 6px;
    }
    .progress-segments {
        height: 18px;
        gap: 1px;
    }
    .progress-seg {
        font-size: 0.4rem;
    }

    /* Chart */
    .chart-section {
        height: 180px;
        padding: 10px;
        margin-bottom: 10px;
    }

    /* HRV bar */
    .hrv-status-bar {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
        padding: 8px 12px;
        margin-bottom: 10px;
    }
    .hrv-text {
        font-size: 0.65rem;
    }
    .hrv-stats {
        gap: 10px;
        font-size: 0.6rem;
    }

    /* Overlay button mobile */
    .btn-tte-done {
        padding: 1.4rem 1.5rem;
        font-size: 1.3rem;
        border-radius: 12px;
    }

    /* Controls */
    .test-controls {
        flex-wrap: wrap;
        gap: 6px;
    }
    .btn-control {
        flex: 1 1 auto;
        justify-content: center;
        padding: 12px 12px;
        font-size: 0.65rem;
        gap: 5px;
    }
    .btn-control svg {
        width: 14px;
        height: 14px;
    }

    /* --- Results screen --- */
    .results-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }
    .result-item {
        padding: 12px 8px;
    }
    .result-label {
        font-size: 0.55rem;
    }
    .result-value {
        font-size: 1rem;
    }
    .export-buttons {
        flex-direction: column;
    }
    .btn-export {
        justify-content: center;
    }

    /* --- Preflight modal --- */
    .preflight-overlay {
        padding: 12px;
    }
    .preflight-modal {
        padding: 18px;
        max-height: 92vh;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        border-radius: 12px;
    }
    .preflight-desc {
        font-size: 0.75rem;
        margin-bottom: 16px;
    }
    .preflight-live {
        grid-template-columns: 1fr 1fr 1fr;
        gap: 6px;
        margin-bottom: 14px;
    }
    .preflight-metric {
        padding: 10px 4px;
    }
    .preflight-metric-label {
        font-size: 0.5rem;
    }
    .preflight-metric-value {
        font-size: 1.2rem;
    }
    .preflight-rr-tickers {
        max-height: 56px;
        padding: 8px;
    }
    .preflight-status {
        padding: 10px 12px;
        margin-bottom: 16px;
    }
    .preflight-actions {
        flex-direction: column-reverse;
        gap: 8px;
    }
    .preflight-actions .btn-stop {
        width: 100%;
        justify-content: center;
    }
    .preflight-actions .btn-start {
        padding: 14px;
    }
}

@media (max-width: 380px) {
    .top-nav-inner {
        height: 40px;
        gap: 0.5rem;
    }
    .top-nav-logo {
        height: 18px;
    }
    .top-nav-links a {
        font-size: 0.6rem;
        padding: 0.25rem 0.4rem;
    }

    .screen {
        padding: 0 8px 32px;
    }
    .card {
        padding: 12px;
        margin-top: 10px;
    }

    .sport-btn {
        padding: 12px 8px;
    }

    .big-value {
        font-size: 2rem;
    }
    .big-metric {
        padding: 12px 6px;
    }

    .small-value {
        font-size: 0.9rem;
    }

    .btn-control {
        padding: 10px 8px;
        font-size: 0.6rem;
    }

    .status-chip {
        font-size: 0.55rem;
        padding: 2px 6px;
    }

    .preflight-metric-value {
        font-size: 1rem;
    }

    .results-grid {
        grid-template-columns: 1fr 1fr;
        gap: 6px;
    }
}

/* ============================================
   DFA ALPHA1 LIVE DISPLAY
   ============================================ */
.dfa-metric-cell {
    position: relative;
    border-left: 3px solid var(--purple);
}
.dfa-value {
    color: var(--text-primary);
    transition: color 0.5s var(--ease);
}
.dfa-value.dfa-zone1 {
    color: var(--run-primary);
}
.dfa-value.dfa-transition {
    color: var(--amber);
}
.dfa-value.dfa-zone2 {
    color: var(--red);
}

/* ============================================
   RR PRE-FLIGHT CONFIRMATION MODAL
   ============================================ */
.preflight-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    align-items: center;
    justify-content: center;
    padding: 20px;
}
.preflight-overlay.active {
    display: flex;
}
.preflight-modal {
    background: var(--bg-elevated);
    border: 1px solid var(--border-accent);
    border-radius: var(--radius-lg);
    padding: 32px;
    max-width: 520px;
    width: 100%;
    animation: modal-in 0.3s var(--ease);
}
@keyframes modal-in {
    from { opacity: 0; transform: scale(0.95) translateY(10px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}
.preflight-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 24px;
}

/* Preflight live metrics */
.preflight-live {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 12px;
    margin-bottom: 20px;
}
.preflight-metric {
    text-align: center;
    padding: 16px 8px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}
.preflight-metric-label {
    display: block;
    font-size: 0.55rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--text-dim);
    text-transform: uppercase;
    margin-bottom: 6px;
}
.preflight-metric-value {
    display: block;
    font-family: 'Montserrat', sans-serif;
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}
.preflight-metric-unit {
    display: block;
    font-size: 0.55rem;
    color: var(--text-dim);
    margin-top: 2px;
}

/* RR stream ticker */
.preflight-rr-stream {
    margin-bottom: 20px;
}
.preflight-stream-label {
    display: block;
    font-size: 0.55rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--text-dim);
    text-transform: uppercase;
    margin-bottom: 8px;
}
.preflight-rr-tickers {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    max-height: 72px;
    overflow: hidden;
    padding: 10px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    min-height: 44px;
}
.rr-tick {
    display: inline-block;
    padding: 2px 8px;
    background: var(--purple-dim);
    color: var(--purple);
    border-radius: 4px;
    font-family: 'Montserrat', sans-serif;
    font-size: 0.65rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    animation: tick-in 0.2s var(--ease);
}
@keyframes tick-in {
    from { opacity: 0; transform: scale(0.8); }
    to { opacity: 1; transform: scale(1); }
}

/* Status indicator */
.preflight-status {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    margin-bottom: 24px;
}
.preflight-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--text-dim);
    flex-shrink: 0;
}
.preflight-dot.waiting {
    background: var(--amber);
    animation: pulse-dot 1.5s ease infinite;
}
.preflight-dot.streaming {
    background: var(--run-primary);
    box-shadow: 0 0 10px rgba(34, 197, 94, 0.5);
    animation: pulse-dot 1.5s ease infinite;
}
.preflight-status-text {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Actions */
.preflight-actions {
    display: flex;
    gap: 12px;
}
.preflight-actions .btn-stop {
    flex-shrink: 0;
}
.preflight-confirm {
    flex: 1;
    max-width: none;
}

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