:root {
    --primary: #2d3436;
    --secondary: #636e72;
    --accent: #00b894;
    --accent-danger: #e17055;
    --accent-warning: #fdcb6e;
    --accent-info: #74b9ff;
    --bg: #f8f9fa;
    --card-bg: #ffffff;
    --sidebar-bg: #2d3436;
    --text: #2d3436;
    --text-light: #636e72;
    --border: #dfe6e9;
    --shadow: 0 2px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--sidebar-bg);
    color: white;
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 32px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.logo-icon { font-size: 32px; }
.logo h1 { font-size: 20px; font-weight: 700; }

.nav-menu { list-style: none; flex: 1; }
.nav-menu li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 4px;
    font-size: 14px;
    opacity: 0.7;
}
.nav-menu li:hover { opacity: 1; background: rgba(255,255,255,0.05); }
.nav-menu li.active { opacity: 1; background: rgba(0,184,148,0.2); color: var(--accent); }
.nav-menu li span { font-size: 18px; }

.rider-profile {
    margin-top: auto;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    gap: 12px;
}
.rider-avatar {
    width: 40px; height: 40px;
    border-radius: 50%;
    background: var(--accent);
    display: flex; align-items: center; justify-content: center;
    font-size: 20px;
}
.rider-info { display: flex; flex-direction: column; }
.rider-name { font-weight: 600; font-size: 14px; }
.rider-level { font-size: 12px; opacity: 0.6; }

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 260px;
    padding: 32px;
    max-width: calc(100vw - 260px);
}

.section { display: none; }
.section.active { display: block; animation: fadeIn 0.3s ease; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}
.section-header h2 { font-size: 28px; font-weight: 700; }

/* Risk Badge */
.risk-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    background: var(--card-bg);
    box-shadow: var(--shadow);
}
.risk-indicator {
    width: 10px; height: 10px;
    border-radius: 50%;
    background: var(--accent-warning);
}
.risk-badge.low .risk-indicator { background: var(--accent); }
.risk-badge.medium .risk-indicator { background: var(--accent-warning); }
.risk-badge.high .risk-indicator { background: var(--accent-danger); }

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-left: 4px solid var(--accent-info);
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.stat-card.highlight { border-left-color: var(--accent-danger); }
.stat-card:nth-child(1) { border-left-color: var(--accent); }
.stat-card:nth-child(2) { border-left-color: var(--accent-info); }
.stat-card:nth-child(3) { border-left-color: var(--accent-warning); }

.stat-icon { font-size: 32px; margin-bottom: 8px; }
.stat-value { font-size: 32px; font-weight: 700; margin-bottom: 4px; }
.stat-label { font-size: 14px; color: var(--text-light); }

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 20px;
    margin-bottom: 24px;
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}
.card h3 { font-size: 18px; margin-bottom: 16px; color: var(--text); }
.card.wide { grid-column: 1 / -1; }
.card.danger { border: 2px solid var(--accent-danger); }

/* Upload Area */
.upload-area {
    border: 3px dashed var(--border);
    border-radius: var(--radius);
    padding: 60px 40px;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
    margin-bottom: 24px;
}
.upload-area:hover, .upload-area.dragover {
    border-color: var(--accent);
    background: rgba(0,184,148,0.03);
}
.upload-icon { font-size: 48px; margin-bottom: 16px; }
.upload-area p { color: var(--text-light); margin-bottom: 20px; }

.upload-form {
    max-width: 500px;
    margin: 20px auto 0;
    text-align: left;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 16px; }
.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text);
}
.form-group input, .form-group textarea, .form-group select {
    width: 100%;
    padding: 10px 14px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    transition: var(--transition);
    font-family: inherit;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
    outline: none;
    border-color: var(--accent);
}
.form-group textarea { min-height: 80px; resize: vertical; }

/* Progress */
.upload-progress {
    margin: 20px 0;
    text-align: center;
}
.progress-bar {
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 8px;
}
.progress-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0%;
}

/* Analysis Result */
.analysis-result { margin-top: 24px; }
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}
.metric-box {
    background: var(--bg);
    padding: 16px;
    border-radius: var(--radius-sm);
    text-align: center;
}
.metric-box .value { font-size: 24px; font-weight: 700; color: var(--accent); }
.metric-box .label { font-size: 12px; color: var(--text-light); margin-top: 4px; }

.recommendations {
    background: rgba(0,184,148,0.05);
    border-left: 4px solid var(--accent);
    padding: 16px 20px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-bottom: 24px;
}
.recommendations h4 { margin-bottom: 8px; }
.recommendations ul { list-style: none; }
.recommendations li { padding: 6px 0; font-size: 14px; }

/* Map */
.map-container {
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 24px;
    box-shadow: var(--shadow);
}
#upload-map, #ride-map { height: 400px; width: 100%; }

/* Segments Table */
.segments-table-container { overflow-x: auto; }
.segments-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}
.segments-table th {
    background: var(--bg);
    padding: 12px;
    text-align: left;
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-light);
}
.segments-table td {
    padding: 12px;
    border-bottom: 1px solid var(--border);
}
.segments-table tr:hover { background: var(--bg); }

.segment-type {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}
.segment-type.subida { background: rgba(0,184,148,0.15); color: #00b894; }
.segment-type.bajada { background: rgba(116,185,255,0.15); color: #0984e3; }
.segment-type.bajada_tecnica { background: rgba(225,112,85,0.15); color: #d63031; }
.segment-type.llano { background: rgba(253,203,110,0.15); color: #e1b12c; }

.shoulder-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}
.shoulder-badge.low { background: rgba(0,184,148,0.15); color: #00b894; }
.shoulder-badge.medium { background: rgba(253,203,110,0.15); color: #e1b12c; }
.shoulder-badge.high { background: rgba(225,112,85,0.15); color: #d63031; }

/* Rides List */
.rides-list { display: grid; gap: 16px; }
.ride-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 20px;
    align-items: center;
    transition: var(--transition);
    cursor: pointer;
}
.ride-card:hover { transform: translateX(4px); box-shadow: var(--shadow-lg); }
.ride-card.high-shoulder { border-left: 4px solid var(--accent-danger); }

.ride-icon { font-size: 32px; }
.ride-info h4 { font-size: 16px; margin-bottom: 4px; }
.ride-meta { display: flex; gap: 16px; font-size: 13px; color: var(--text-light); }
.ride-meta span { display: flex; align-items: center; gap: 4px; }
.ride-stats { display: flex; gap: 16px; }
.ride-stat { text-align: center; }
.ride-stat .value { font-size: 18px; font-weight: 700; }
.ride-stat .label { font-size: 11px; color: var(--text-light); }

/* Filters */
.filters { display: flex; gap: 8px; }
.filter-btn, .period-btn {
    padding: 8px 16px;
    border: 2px solid var(--border);
    background: var(--card-bg);
    border-radius: 20px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: var(--transition);
    font-family: inherit;
}
.filter-btn:hover, .period-btn:hover { border-color: var(--accent); }
.filter-btn.active, .period-btn.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

/* Analytics Grid */
.analytics-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

/* Training */
.form-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow);
    max-width: 500px;
}
.form-card h3 { margin-bottom: 24px; }

.btn-primary {
    background: var(--accent);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}
.btn-primary:hover { background: #00a383; transform: translateY(-1px); }

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 12px;
    margin-top: 24px;
}
.calendar-day {
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    padding: 16px;
    text-align: center;
    box-shadow: var(--shadow);
    min-height: 120px;
}
.calendar-day .day-name { font-size: 12px; color: var(--text-light); text-transform: uppercase; }
.calendar-day .day-content { margin-top: 8px; }
.calendar-day.rest { background: var(--bg); opacity: 0.6; }
.calendar-day .session-type { font-size: 12px; font-weight: 600; margin-bottom: 4px; }
.calendar-day .session-distance { font-size: 14px; color: var(--accent); }

/* Health */
.health-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.risk-meter { margin: 20px 0; }
.risk-level { font-size: 24px; font-weight: 700; margin-bottom: 12px; }
.risk-bar {
    height: 12px;
    background: var(--border);
    border-radius: 6px;
    overflow: hidden;
}
.risk-fill {
    height: 100%;
    border-radius: 6px;
    transition: width 0.5s ease;
    width: 0%;
}
.risk-fill.low { background: var(--accent); }
.risk-fill.medium { background: var(--accent-warning); }
.risk-fill.high { background: var(--accent-danger); }

.exercises-list { display: grid; gap: 16px; }
.exercise-item {
    display: flex;
    gap: 16px;
    padding: 16px;
    background: var(--bg);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}
.exercise-item:hover { background: rgba(0,184,148,0.05); }
.exercise-icon { font-size: 28px; }
.exercise-info h4 { font-size: 15px; margin-bottom: 4px; }
.exercise-info p { font-size: 13px; color: var(--text-light); }
.exercise-tag {
    display: inline-block;
    padding: 2px 8px;
    background: var(--accent);
    color: white;
    border-radius: 10px;
    font-size: 11px;
    margin-top: 6px;
}

/* Loading */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-light);
}

/* Recommendations List */
.recommendations-list { display: grid; gap: 12px; }
.recommendation-item {
    padding: 16px;
    background: var(--bg);
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--accent);
    font-size: 14px;
    line-height: 1.6;
}
.recommendation-item.warning { border-left-color: var(--accent-warning); }
.recommendation-item.danger { border-left-color: var(--accent-danger); }

/* Responsive */
@media (max-width: 1024px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .dashboard-grid { grid-template-columns: 1fr; }
    .analytics-grid { grid-template-columns: 1fr; }
    .health-grid { grid-template-columns: 1fr; }
    .calendar-grid { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 768px) {
    .sidebar { width: 200px; }
    .main-content { margin-left: 200px; padding: 16px; }
    .stats-grid { grid-template-columns: 1fr; }
    .ride-card { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .calendar-grid { grid-template-columns: repeat(2, 1fr); }
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--secondary); }