/* ==========================================================================
   Wingfoil — Design System
   Dark ocean theme · Deep navy + teal + cyan
   ========================================================================== */

/* ---- CSS Variables ---------------------------------------------------- */
:root {
    /* Palette */
    --color-bg:           #0f1a2e;
    --color-bg-alt:       #162240;
    --color-bg-card:      #1a2a40;
    --color-bg-hover:     #1f3050;
    --color-surface:      #1e2d42;
    --color-border:       #2a3f5a;

    --color-text:         #d0dce8;
    --color-text-muted:   #8899b0;
    --color-heading:      #e8eef4;

    --color-primary:      #00d4aa;
    --color-primary-dim:  #00a88a;
    --color-accent:       #4488ff;
    --color-accent-dim:   #3366cc;
    --color-danger:       #ff5555;
    --color-warning:      #ffaa00;

    /* Speed legend */
    --color-spd-0:   #ff4444;
    --color-spd-4:   #ff8844;
    --color-spd-8:   #ffcc00;
    --color-spd-12:  #aadd00;
    --color-spd-16:  #44dd44;
    --color-spd-20:  #22cc88;
    --color-spd-24:  #00d4aa;
    --color-spd-28:  #00bbdd;
    --color-spd-32:  #4488ff;

    /* Typography */
    --font-heading: 'Plus Jakarta Sans', sans-serif;
    --font-body:    'Inter', system-ui, -apple-system, sans-serif;

    --text-xs: 0.75rem;
    --text-sm: 0.8125rem;
    --text-base: 0.9375rem;
    --text-lg: 1.125rem;
    --text-xl: 1.375rem;
    --text-2xl: 1.75rem;
    --text-3xl: 2.25rem;

    --weight-normal: 400;
    --weight-medium: 500;
    --weight-semibold: 600;
    --weight-bold: 700;
    --weight-extrabold: 800;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;

    /* Radii */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 20px rgba(0,212,170,0.15);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;

    /* Layout */
    --max-width: 1280px;
    --nav-height: 60px;
}

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

html { font-size: 16px; -webkit-font-smoothing: antialiased; }

body {
    font-family: var(--font-body);
    font-size: var(--text-base);
    font-weight: var(--weight-normal);
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    min-height: 100vh;
}

img, svg { display: block; max-width: 100%; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-primary-dim); }
h1, h2, h3, h4, h5, h6 { font-family: var(--font-heading); color: var(--color-heading); line-height: 1.3; }

/* ---- Nav -------------------------------------------------------------- */
.nav {
    position: sticky; top: 0; z-index: 100;
    height: var(--nav-height);
    background: rgba(15, 26, 46, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}
.nav__inner {
    max-width: var(--max-width); margin: 0 auto;
    display: flex; align-items: center; justify-content: space-between;
    height: 100%; padding: 0 var(--space-6);
}
.nav__brand {
    display: flex; align-items: center; gap: var(--space-3);
    font-family: var(--font-heading); font-weight: var(--weight-bold);
    font-size: var(--text-lg); color: var(--color-heading);
}
.nav__brand:hover { color: var(--color-primary); }
.nav__logo { flex-shrink: 0; }
.nav__links { display: flex; gap: var(--space-4); align-items: center; }
.nav__link--upload {
    background: rgba(0,212,170,0.1); border: 1px solid rgba(0,212,170,0.2);
    padding: 4px 12px; border-radius: var(--radius-sm);
}
.nav__link--upload:hover { background: rgba(0,212,170,0.18); border-color: rgba(0,212,170,0.4); }
.nav__link {
    font-size: var(--text-sm); font-weight: var(--weight-medium);
    color: var(--color-text-muted); padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm); transition: all var(--transition-fast);
}
.nav__link:hover { color: var(--color-heading); background: var(--color-bg-hover); }
.nav__user {
    font-size: var(--text-sm); color: var(--color-text-muted);
    padding: var(--space-2) var(--space-2);
}

/* ---- Main Layout ------------------------------------------------------ */
.main {
    max-width: var(--max-width); margin: 0 auto;
    padding: var(--space-8) var(--space-6);
    min-height: calc(100vh - var(--nav-height) - 60px);
}

/* ---- Footer ----------------------------------------------------------- */
.footer {
    border-top: 1px solid var(--color-border);
    padding: var(--space-6) var(--space-6);
    text-align: center;
}
.footer__inner { max-width: var(--max-width); margin: 0 auto; }
.footer p { font-size: var(--text-xs); color: var(--color-text-muted); }

/* ---- Page Header ------------------------------------------------------ */
.page-header { margin-bottom: var(--space-8); }
.page-header h1 {
    font-size: var(--text-3xl);
    font-weight: var(--weight-extrabold);
    letter-spacing: -0.02em;
}
.page-subtitle {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-1);
}

/* ---- Session Cards Grid ----------------------------------------------- */
.sessions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-5);
}

.session-card {
    display: flex; flex-direction: column;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    transition: all var(--transition-base);
    color: var(--color-text);
    position: relative;
    overflow: hidden;
}
.session-card::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    opacity: 0;
    transition: opacity var(--transition-base);
}
.session-card:hover {
    border-color: var(--color-primary-dim);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--color-text);
}
.session-card:hover::before { opacity: 1; }

.session-card__header { margin-bottom: var(--space-4); }
.session-card__title {
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: var(--weight-bold);
    color: var(--color-heading);
    margin-bottom: var(--space-1);
}
.session-card__date {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.session-card__body { flex: 1; }

.stat-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-2);
}
.stat-item {
    text-align: center;
    background: rgba(0,0,0,0.2);
    border-radius: var(--radius-sm);
    padding: var(--space-2) var(--space-1);
}
.stat-value {
    display: block;
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: var(--weight-bold);
    color: var(--color-primary);
    line-height: 1.2;
}
.stat-label {
    display: block;
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    margin-top: var(--space-1);
}
.session-card__wind { margin-top: var(--space-3); }
.wind-badge {
    display: inline-block;
    font-size: var(--text-xs);
    font-weight: var(--weight-medium);
    color: var(--color-accent);
    background: rgba(68, 136, 255, 0.1);
    border: 1px solid rgba(68, 136, 255, 0.2);
    border-radius: var(--radius-full);
    padding: 2px var(--space-3);
}

.session-card__footer {
    display: flex; justify-content: space-between; align-items: center;
    margin-top: var(--space-4);
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-border);
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}
.card-arrow {
    font-size: var(--text-lg);
    color: var(--color-primary);
    transition: transform var(--transition-fast);
}
.session-card:hover .card-arrow { transform: translateX(4px); }

/* ---- Empty State ------------------------------------------------------ */
.empty-state {
    text-align: center;
    padding: var(--space-16) var(--space-6);
    color: var(--color-text-muted);
}
.empty-state__icon { color: var(--color-text-muted); margin-bottom: var(--space-6); opacity: 0.4; }
.empty-state h2 {
    font-size: var(--text-2xl);
    font-weight: var(--weight-bold);
    margin-bottom: var(--space-3);
}
.empty-state p { font-size: var(--text-base); margin-bottom: var(--space-6); }
.cli-hint {
    display: inline-block;
    font-family: 'SFMono-Regular', Consolas, monospace;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    color: var(--color-primary);
}

/* ---- Map Page --------------------------------------------------------- */
.map-page { display: flex; flex-direction: column; gap: var(--space-5); }

.map-header {
    display: flex; justify-content: space-between; align-items: flex-start;
    flex-wrap: wrap; gap: var(--space-4);
}
.map-header__info h1 {
    font-size: var(--text-2xl);
    font-weight: var(--weight-extrabold);
    letter-spacing: -0.02em;
}
.map-header__meta {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-1);
}
.meta-sep { margin: 0 var(--space-2); opacity: 0.3; }

/* ---- Buttons ---------------------------------------------------------- */
.btn {
    display: inline-flex; align-items: center; gap: var(--space-2);
    font-family: var(--font-body);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    cursor: pointer;
    transition: all var(--transition-fast);
    background: var(--color-surface);
    color: var(--color-text);
    line-height: 1;
}
.btn:hover { background: var(--color-bg-hover); border-color: var(--color-text-muted); }
.btn-ghost {
    background: transparent;
    border-color: transparent;
    color: var(--color-text-muted);
}
.btn-ghost:hover { background: var(--color-bg-hover); color: var(--color-heading); }
.btn-icon {
    width: 36px; height: 36px;
    padding: 0; justify-content: center;
    border-radius: var(--radius-full);
    background: var(--color-bg-card);
    border-color: var(--color-border);
    color: var(--color-text);
}
.btn-icon:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
    box-shadow: var(--shadow-glow);
}

/* ---- Playback Controls ------------------------------------------------ */
.playback-controls {
    display: flex; align-items: center; gap: var(--space-4);
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}
.playback-buttons { display: flex; gap: var(--space-2); }
.playback-speed-display {
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: var(--weight-bold);
}
.playback-replay-speed {
    display: flex; align-items: center; gap: var(--space-2);
    margin-left: auto;
}
.speed-buttons { display: flex; gap: 2px; }
.btn-speed {
    min-width: 32px; justify-content: center;
    padding: 2px 6px; font-size: 11px;
    background: transparent; border-color: transparent;
    color: var(--color-text-muted);
}
.btn-speed:hover { color: var(--color-heading); background: var(--color-bg-hover); }
.btn-speed.active {
    color: var(--color-primary);
    background: rgba(0,212,170,0.1);
    border-color: rgba(0,212,170,0.3);
}
.speed-label { font-size: var(--text-xs); color: var(--color-text-muted); font-weight: var(--weight-normal); }
.speed-value { color: var(--color-primary); }

/* ---- Map Layout ------------------------------------------------------- */
.map-layout {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: var(--space-5);
    align-items: start;
}
.map-main { display: flex; flex-direction: column; gap: var(--space-3); }
.map-wrapper {
    position: relative;
    height: 55vh;
    min-height: 400px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
}
.map-container { width: 100%; height: 100%; }

.speed-hud {
    position: absolute; top: 12px; right: 12px; z-index: 1000;
    background: rgba(0,0,0,0.75);
    backdrop-filter: blur(4px);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-sm);
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: var(--weight-bold);
    color: var(--color-primary);
    pointer-events: none;
}

/* ---- Timeline --------------------------------------------------------- */
.timeline-container {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-4);
}
.timeline-track {
    width: 100%; height: 24px;
    background: #1a2a3a;
    border-radius: var(--radius-sm);
    position: relative;
    cursor: pointer;
    overflow: hidden;
}
.timeline-segment {
    position: absolute; top: 0; height: 100%;
    pointer-events: none;
}
.timeline-progress {
    position: absolute; top: 0; left: 0; height: 100%;
    background: rgba(0,0,0,0.35);
    pointer-events: none;
    transition: width 50ms linear;
}
.timeline-cursor {
    position: absolute; top: -4px; width: 3px; height: 32px;
    background: #fff;
    border-radius: 2px;
    left: 0;
    transform: translateX(-50%);
    pointer-events: none;
    box-shadow: 0 0 6px rgba(255,255,255,0.3);
    transition: left 50ms linear;
}
.timeline-ticks { position: absolute; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; }
.tick-mark {
    position: absolute; top: 0; width: 1px; height: 100%;
    background: rgba(255,255,255,0.15);
}
.tick-label {
    position: absolute; top: 28px;
    transform: translateX(-50%);
    font-size: 9px; color: var(--color-text-muted);
    white-space: nowrap;
}
.timeline-labels {
    display: flex; justify-content: center; align-items: center;
    gap: var(--space-2); margin-top: var(--space-4);
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}
.timeline-time { color: var(--color-primary); font-weight: var(--weight-bold); }
.timeline-sep { opacity: 0.3; }

/* ---- Stats Panel ------------------------------------------------------ */
.stats-panel {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    display: flex; flex-direction: column; gap: var(--space-5);
}
.stats-panel__title {
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);
}
.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3);
}
.stat-card {
    background: rgba(0,0,0,0.2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: var(--space-3);
    text-align: center;
    transition: all var(--transition-fast);
}
.stat-card:hover { border-color: var(--color-primary-dim); }
.stat-card--accent {
    border-color: var(--color-primary-dim);
    background: rgba(0, 212, 170, 0.05);
}
.stat-card--accent .stat-card__value { color: var(--color-primary); }
.stat-card__value {
    display: block;
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: var(--weight-extrabold);
    color: var(--color-accent);
    line-height: 1.2;
}
.stat-card__unit {
    display: block;
    font-size: 10px;
    font-weight: var(--weight-semibold);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 1px;
}
.stat-card__label {
    display: block;
    font-size: 10px;
    color: var(--color-text-muted);
    margin-top: var(--space-1);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* ---- Speed Legend (sidebar) ------------------------------------------- */
.speed-legend {
    background: rgba(0,0,0,0.15);
    border-radius: var(--radius-sm);
    padding: var(--space-3);
}
.speed-legend__title {
    font-size: 10px; font-weight: var(--weight-semibold);
    color: var(--color-text-muted);
    text-transform: uppercase; letter-spacing: 0.05em;
    margin-bottom: var(--space-2);
}
.speed-legend__bar {
    height: 8px;
    background: linear-gradient(90deg,
        var(--color-spd-0), var(--color-spd-4), var(--color-spd-8),
        var(--color-spd-12), var(--color-spd-16), var(--color-spd-20),
        var(--color-spd-24), var(--color-spd-28), var(--color-spd-32));
    border-radius: 4px;
}
.speed-legend__labels {
    display: flex; justify-content: space-between;
    font-size: 9px; color: var(--color-text-muted);
    margin-top: 4px;
}

/* ---- Map: Fallback (Folium) ------------------------------------------- */
.map-wrapper--full { height: 65vh; }
.map-folium-container { width: 100%; height: 100%; }
.map-folium-container iframe { border: none; }

/* ---- Leaflet Overrides (dark theme) ----------------------------------- */
.marker-custom { background: none !important; border: none !important; }
.marker-dot {
    width: 18px; height: 18px; border-radius: 50%;
    border: 2px solid #fff;
    box-shadow: 0 2px 6px rgba(0,0,0,0.4);
}
.marker-dot--start { background: #00d4aa; }
.marker-dot--end { background: #ff5555; }
.marker-dot--replay {
    width: 14px; height: 14px;
    background: #4488ff;
    border: 2px solid #fff;
    box-shadow: 0 0 12px rgba(68,136,255,0.5);
}
.map-tiles { filter: brightness(0.85) saturate(0.9); }

/* ---- Auth Pages ------------------------------------------------------- */
.auth-page {
    display: flex; justify-content: center; align-items: flex-start;
    padding-top: var(--space-12);
}
.auth-card {
    width: 100%; max-width: 380px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-8) var(--space-6);
}
.auth-card__title {
    font-size: var(--text-2xl);
    font-weight: var(--weight-extrabold);
    text-align: center;
    margin-bottom: var(--space-1);
}
.auth-card__subtitle {
    text-align: center;
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--space-6);
}
.auth-form { display: flex; flex-direction: column; gap: var(--space-4); }
.form-group { display: flex; flex-direction: column; gap: var(--space-2); }
.form-label {
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: var(--color-heading);
}
.form-input {
    font-family: var(--font-body);
    font-size: var(--text-base);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    color: var(--color-text);
    transition: border-color var(--transition-fast);
    outline: none;
}
.form-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(0,212,170,0.15);
}
.btn--primary {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #0f1a2e;
    font-weight: var(--weight-semibold);
    justify-content: center;
}
.btn--primary:hover {
    background: var(--color-primary-dim);
    border-color: var(--color-primary-dim);
}
.btn--full { width: 100%; }
.auth-form .btn { padding: var(--space-3) var(--space-4); }

/* Messages */
.message {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
    margin-bottom: var(--space-4);
}
.message--error {
    background: rgba(255,85,85,0.1);
    border: 1px solid rgba(255,85,85,0.25);
    color: var(--color-danger);
}

/* ---- Responsive ------------------------------------------------------- */
@media (max-width: 768px) {
    .map-layout {
        grid-template-columns: 1fr;
    }
    .stats-panel {
        order: -1;
    }
    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .map-wrapper {
        height: 40vh;
        min-height: 300px;
    }
    .map-header {
        flex-direction: column;
    }
    .sessions-grid {
        grid-template-columns: 1fr;
    }
    .playback-controls {
        justify-content: space-between;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .main {
        padding: var(--space-4) var(--space-4);
    }
    .stat-row {
        grid-template-columns: repeat(2, 1fr);
    }
    .page-header h1 { font-size: var(--text-2xl); }
}