/**
 * GymScan — PWA Styles
 * Dark theme, structured workout cards, mobile-first.
 */

/* =========================================================================
 * RESET & BASE
 * ========================================================================= */

#gymscan-app {
    --gv-bg: #0f172a;
    --gv-surface: #1e293b;
    --gv-surface-2: #334155;
    --gv-border: #475569;
    --gv-text: #f1f5f9;
    --gv-text-muted: #94a3b8;
    --gv-primary: #6366f1;
    --gv-primary-hover: #818cf8;
    --gv-accent: #22d3ee;
    --gv-success: #34d399;
    --gv-warning: #fbbf24;
    --gv-danger: #f87171;
    --gv-radius: 16px;
    --gv-radius-sm: 10px;
    --gv-radius-xs: 6px;

    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--gv-bg);
    color: var(--gv-text);
    min-height: 100vh;
    max-width: 480px;
    margin: 0 auto;
    padding: 0 16px 32px;
    -webkit-font-smoothing: antialiased;
}

#gymscan-app *,
#gymscan-app *::before,
#gymscan-app *::after {
    box-sizing: border-box;
}

/* Hide inactive screens */
.gv-screen { display: none; }
.gv-screen.gv-active { display: block; }

/* =========================================================================
 * HERO / BRANDING
 * ========================================================================= */

.gv-hero {
    text-align: center;
    padding: 40px 0 24px;
}

.gv-logo-icon svg {
    width: 64px;
    height: 64px;
    margin-bottom: 12px;
}

.gv-title {
    font-size: 28px;
    font-weight: 800;
    margin: 0;
    background: linear-gradient(135deg, #818cf8, #22d3ee);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.gv-subtitle {
    font-size: 15px;
    color: var(--gv-text-muted);
    margin: 6px 0 0;
}

/* =========================================================================
 * CAPTURE ZONE
 * ========================================================================= */

.gv-capture-zone {
    position: relative;
    width: 100%;
    aspect-ratio: 4/3;
    background: var(--gv-surface);
    border: 2px dashed var(--gv-border);
    border-radius: var(--gv-radius);
    overflow: hidden;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
}

.gv-capture-zone:hover,
.gv-capture-zone.gv-dragover {
    border-color: var(--gv-primary);
    background: rgba(99, 102, 241, 0.08);
}

.gv-camera-prompt {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    gap: 12px;
    color: var(--gv-text-muted);
    font-size: 15px;
}

.gv-camera-icon {
    width: 48px;
    height: 48px;
    color: var(--gv-border);
}

.gv-preview {
    display: none;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* =========================================================================
 * OPTIONS (Pill Selectors)
 * ========================================================================= */

.gv-options {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin: 20px 0;
}

.gv-option-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--gv-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
}

.gv-pill-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.gv-pill {
    padding: 8px 16px;
    border-radius: 100px;
    border: 1.5px solid var(--gv-border);
    background: transparent;
    color: var(--gv-text-muted);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    -webkit-tap-highlight-color: transparent;
}

.gv-pill:hover {
    border-color: var(--gv-primary);
    color: var(--gv-text);
}

.gv-pill-active {
    background: var(--gv-primary);
    border-color: var(--gv-primary);
    color: #fff;
}

/* =========================================================================
 * BUTTONS
 * ========================================================================= */

.gv-btn-primary {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 16px;
    border: none;
    border-radius: var(--gv-radius-sm);
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    color: #fff;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: opacity 0.2s, transform 0.1s;
    -webkit-tap-highlight-color: transparent;
}

.gv-btn-primary:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.gv-btn-primary:not(:disabled):hover {
    opacity: 0.9;
}

.gv-btn-primary:not(:disabled):active {
    transform: scale(0.98);
}

.gv-btn-loading {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.gv-spinner {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 2.5px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: gv-spin 0.7s linear infinite;
}

@keyframes gv-spin {
    to { transform: rotate(360deg); }
}

.gv-btn-secondary {
    display: block;
    width: 100%;
    padding: 14px;
    border: 1.5px solid var(--gv-border);
    border-radius: var(--gv-radius-sm);
    background: transparent;
    color: var(--gv-text);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.gv-btn-secondary:hover {
    border-color: var(--gv-primary);
    background: rgba(99, 102, 241, 0.1);
}

.gv-btn-back {
    padding: 8px 16px;
    border: none;
    border-radius: var(--gv-radius-xs);
    background: var(--gv-surface);
    color: var(--gv-text-muted);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.gv-btn-back:hover {
    color: var(--gv-text);
    background: var(--gv-surface-2);
}

/* =========================================================================
 * ERROR
 * ========================================================================= */

.gv-error {
    margin-top: 12px;
    padding: 12px 16px;
    background: rgba(248, 113, 113, 0.12);
    border: 1px solid rgba(248, 113, 113, 0.3);
    border-radius: var(--gv-radius-xs);
    color: var(--gv-danger);
    font-size: 14px;
    text-align: center;
}

/* =========================================================================
 * WORKOUT SCREEN
 * ========================================================================= */

.gv-workout-header {
    padding: 24px 0 16px;
}

.gv-workout-title {
    font-size: 24px;
    font-weight: 800;
    margin: 12px 0 8px;
    line-height: 1.2;
}

.gv-workout-stats {
    display: flex;
    gap: 16px;
    color: var(--gv-text-muted);
    font-size: 14px;
}

.gv-stat strong {
    color: var(--gv-accent);
    font-weight: 700;
}

/* Equipment tags */
.gv-equipment-section {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin-bottom: 20px;
}

.gv-equipment-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--gv-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.gv-tag {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 100px;
    color: var(--gv-primary-hover);
    font-size: 13px;
    font-weight: 500;
}

/* Phase cards (warmup / cooldown) */
.gv-phase-card {
    padding: 16px;
    border-radius: var(--gv-radius-sm);
    margin-bottom: 16px;
}

.gv-warmup {
    background: rgba(251, 191, 36, 0.08);
    border: 1px solid rgba(251, 191, 36, 0.2);
}

.gv-cooldown {
    background: rgba(34, 211, 238, 0.08);
    border: 1px solid rgba(34, 211, 238, 0.2);
    margin-top: 16px;
}

.gv-phase-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.gv-phase-icon {
    font-size: 18px;
}

.gv-phase-title {
    font-weight: 700;
    font-size: 15px;
    flex: 1;
}

.gv-phase-duration {
    font-size: 13px;
    color: var(--gv-text-muted);
    font-weight: 500;
}

.gv-phase-desc {
    font-size: 14px;
    color: var(--gv-text-muted);
    margin: 0;
    line-height: 1.5;
}

/* =========================================================================
 * EXERCISE CARDS
 * ========================================================================= */

.gv-exercise-card {
    display: flex;
    gap: 14px;
    padding: 16px;
    background: var(--gv-surface);
    border: 1px solid rgba(71, 85, 105, 0.5);
    border-radius: var(--gv-radius-sm);
    margin-bottom: 12px;
    animation: gv-slide-in 0.4s ease-out both;
}

@keyframes gv-slide-in {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.gv-exercise-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    min-width: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    color: #fff;
    font-size: 15px;
    font-weight: 800;
}

.gv-exercise-content {
    flex: 1;
    min-width: 0;
}

.gv-exercise-name {
    font-size: 16px;
    font-weight: 700;
    margin: 0 0 4px;
    line-height: 1.3;
}

.gv-exercise-equipment {
    font-size: 13px;
    color: var(--gv-accent);
    font-weight: 500;
    margin-bottom: 8px;
}

.gv-exercise-params {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    margin-bottom: 8px;
}

.gv-param {
    font-weight: 600;
    color: var(--gv-text);
}

.gv-param-sep {
    color: var(--gv-text-muted);
    font-size: 12px;
}

.gv-exercise-muscles {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 6px;
}

.gv-muscle-tag {
    display: inline-block;
    padding: 2px 8px;
    background: var(--gv-surface-2);
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
    color: var(--gv-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.gv-exercise-difficulty {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.gv-diff-beginner {
    background: rgba(52, 211, 153, 0.15);
    color: var(--gv-success);
}

.gv-diff-intermediate {
    background: rgba(251, 191, 36, 0.15);
    color: var(--gv-warning);
}

.gv-diff-advanced {
    background: rgba(248, 113, 113, 0.15);
    color: var(--gv-danger);
}

.gv-coaching-tip {
    margin: 8px 0 0;
    padding: 8px 10px;
    background: rgba(99, 102, 241, 0.08);
    border-radius: var(--gv-radius-xs);
    font-size: 13px;
    color: var(--gv-text-muted);
    line-height: 1.4;
}

/* =========================================================================
 * FOOTER
 * ========================================================================= */

.gv-workout-footer {
    margin-top: 24px;
    padding-bottom: 40px;
}

/* =========================================================================
 * RESPONSIVE — already mobile-first, minor desktop tweaks
 * ========================================================================= */

@media (min-width: 600px) {
    #gymscan-app {
        padding: 0 24px 48px;
    }

    .gv-exercise-card {
        padding: 20px;
    }
}

/* =========================================================================
 * SAFE AREA (notched phones)
 * ========================================================================= */

@supports (padding-top: env(safe-area-inset-top)) {
    #gymscan-app {
        padding-top: env(safe-area-inset-top);
        padding-bottom: calc(32px + env(safe-area-inset-bottom));
    }
}