/* ============================================================
   Strava GPX Uploader — Design System
   Dark mode first, Strava-inspired, glassmorphism
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* --- CSS Variables (Design Tokens) --- */
:root {
    /* Background */
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-card: rgba(22, 27, 34, 0.8);
    --bg-glass: rgba(22, 27, 34, 0.6);
    --bg-input: #0d1117;

    /* Text */
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-tertiary: #6e7681;
    --text-inverse: #0d1117;

    /* Accent — Strava Orange */
    --accent: #FC4C02;
    --accent-hover: #e04400;
    --accent-light: #ff6a33;
    --accent-glow: rgba(252, 76, 2, 0.15);
    --accent-border: rgba(252, 76, 2, 0.3);

    /* Status */
    --success: #3fb950;
    --success-bg: rgba(63, 185, 80, 0.1);
    --warning: #d29922;
    --warning-bg: rgba(210, 153, 34, 0.1);
    --error: #f85149;
    --error-bg: rgba(248, 81, 73, 0.1);
    --info: #58a6ff;
    --info-bg: rgba(88, 166, 255, 0.1);

    /* Border */
    --border: #30363d;
    --border-hover: #484f58;
    --border-focus: var(--accent);

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Typography */
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition: 0.2s ease;
    --transition-slow: 0.3s ease;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px var(--accent-glow);
}

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

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

body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-light); }

img { max-width: 100%; display: block; }

/* --- Layout --- */
.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.main-content {
    flex: 1;
    padding: var(--space-xl) 0;
}

/* --- Nav --- */
.nav {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    max-width: 1100px;
    margin: 0 auto;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--text-primary);
}

.nav-brand .icon { font-size: 1.5rem; }

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-family: var(--font);
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: var(--accent);
    color: white;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 0 30px var(--accent-glow);
    color: white;
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--border);
    color: var(--text-primary);
    border-color: var(--border-hover);
}

.btn-success {
    background: var(--success);
    color: var(--text-inverse);
}

.btn-success:hover {
    background: #36a148;
    color: var(--text-inverse);
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1.05rem;
    border-radius: var(--radius-lg);
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.85rem;
}

.btn-icon { padding: 8px; border-radius: var(--radius-sm); }

/* --- Cards --- */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    backdrop-filter: blur(10px);
    transition: all var(--transition);
}

.card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-md);
}

.card-accent {
    border-color: var(--accent-border);
    background: linear-gradient(135deg, var(--bg-card), var(--accent-glow));
}

/* --- Forms --- */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.95rem;
    transition: all var(--transition);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-textarea { resize: vertical; min-height: 80px; }

/* --- Upload Zone --- */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius-xl);
    padding: var(--space-3xl) var(--space-xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-slow);
    background: var(--bg-secondary);
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--accent);
    background: var(--accent-glow);
    box-shadow: var(--shadow-glow);
}

.upload-zone .icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
    opacity: 0.6;
}

.upload-zone p {
    color: var(--text-secondary);
    font-size: 1rem;
}

.upload-zone .highlight {
    color: var(--accent);
    font-weight: 600;
}

/* --- Stats Grid --- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--space-md);
}

.stat-card {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    text-align: center;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.stat-value.accent { color: var(--accent); }

.stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: var(--space-xs);
}

/* --- Comparison (Before/After) --- */
.comparison-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
}

.comparison-col h3 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--border);
}

.comparison-col.original h3 { color: var(--text-secondary); }
.comparison-col.modified h3 { color: var(--accent); border-color: var(--accent); }

/* --- Flash Messages --- */
.flash {
    padding: var(--space-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    animation: slideDown 0.3s ease;
}

.flash-success { background: var(--success-bg); border: 1px solid var(--success); color: var(--success); }
.flash-error { background: var(--error-bg); border: 1px solid var(--error); color: var(--error); }
.flash-warning { background: var(--warning-bg); border: 1px solid var(--warning); color: var(--warning); }
.flash-info { background: var(--info-bg); border: 1px solid var(--info); color: var(--info); }

/* --- Map --- */
.map-container {
    width: 100%;
    height: 400px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border);
}

/* --- Table --- */
.table-container { overflow-x: auto; }

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.table th {
    text-align: left;
    padding: var(--space-md);
    border-bottom: 2px solid var(--border);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.table td {
    padding: var(--space-md);
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
}

.table tr:hover td {
    background: var(--bg-tertiary);
}

/* --- Status Badges --- */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.badge-success { background: var(--success-bg); color: var(--success); }
.badge-warning { background: var(--warning-bg); color: var(--warning); }
.badge-error { background: var(--error-bg); color: var(--error); }
.badge-info { background: var(--info-bg); color: var(--info); }

/* --- Hero Section --- */
.hero {
    text-align: center;
    padding: var(--space-3xl) 0;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--text-primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-md);
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--space-xl);
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* --- Feature Cards --- */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
    margin: var(--space-2xl) 0;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
    transition: all var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-border);
    box-shadow: var(--shadow-lg);
}

.feature-card .icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-md);
}

.feature-card h3 {
    font-size: 1.1rem;
    margin-bottom: var(--space-sm);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* --- Connection Status --- */
.connections {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    margin: var(--space-lg) 0;
}

.connection-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 500;
}

.connection-badge.connected {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid var(--success);
}

.connection-badge.disconnected {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

/* --- Guide Steps --- */
.guide-steps {
    counter-reset: step;
}

.guide-step {
    display: flex;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
    padding: var(--space-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
}

.guide-step::before {
    counter-increment: step;
    content: counter(step);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    background: var(--accent);
    color: white;
    border-radius: 50%;
    font-weight: 700;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.guide-step-content h3 {
    font-size: 1rem;
    margin-bottom: var(--space-xs);
}

.guide-step-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* --- Footer --- */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: var(--space-lg);
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.85rem;
}

/* --- Page Header --- */
.page-header {
    margin-bottom: var(--space-xl);
}

.page-header h1 {
    font-size: 1.8rem;
    font-weight: 700;
}

.page-header p {
    color: var(--text-secondary);
    margin-top: var(--space-xs);
}

/* --- Loading --- */
.loading {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
}

.spinner {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

/* --- Animations --- */
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes slideDown { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }

/* --- Admin Panel --- */
.admin-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.admin-table th,
.admin-table td {
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.admin-table th {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: rgba(255, 255, 255, 0.02);
}

.admin-table tr:hover {
    background: rgba(255, 255, 255, 0.03);
}

.admin-table a {
    color: var(--accent);
    text-decoration: none;
}

.admin-table a:hover {
    text-decoration: underline;
}

/* --- Badges --- */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.3px;
}

.badge-role {
    background: rgba(99, 179, 237, 0.15);
    color: #63b3ed;
}

.badge-active {
    background: rgba(72, 187, 120, 0.15);
    color: #48bb78;
}

.badge-pending,
.badge-pending_verification {
    background: rgba(237, 187, 73, 0.15);
    color: #edbb49;
}

.badge-suspended {
    background: rgba(245, 101, 101, 0.15);
    color: #f56565;
}

.badge-rejected {
    background: rgba(160, 120, 120, 0.15);
    color: #a07878;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .hero h1 { font-size: 2rem; }
    .hero p { font-size: 1rem; }
    .nav-links { gap: var(--space-sm); }
    .comparison-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .guide-step { flex-direction: column; align-items: flex-start; }
    .container { padding: 0 var(--space-md); }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 1.6rem; }
    .stats-grid { grid-template-columns: 1fr; }
    .nav-links a span.label { display: none; }
    .hero-actions { flex-direction: column; align-items: center; }
}