/* ============================================================
   Trainer Tim — Trail Running Dashboard Styles
   Earthy palette, mobile-first, fully responsive
   ============================================================ */

/* --- CSS Variables --- */
:root {
    --green-deep: #1B4332;
    --green-mid: #2D6A4F;
    --green-light: #40916C;
    --green-pale: #52B788;
    --brown: #8B5E3C;
    --brown-light: #D4A574;
    --brown-pale: #E8D5B7;
    --slate: #2D3748;
    --slate-light: #4A5568;
    --cream: #F7F3E8;
    --white: #FFFFFF;
    --off-white: #FAF9F6;
    --danger: #C53030;
    --danger-light: #FED7D7;
    --success: #2F855A;
    --success-light: #C6F6D5;
    --warning: #B7791F;
    --warning-light: #FEFCBF;
    --info: #2B6CB0;
    --info-light: #BEE3F8;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.1), 0 10px 10px rgba(0,0,0,0.04);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;

    --font-sans: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'SF Mono', 'Cascadia Code', 'Fira Code', monospace;

    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

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

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

body {
    font-family: var(--font-sans);
    background: var(--cream);
    color: var(--slate);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- Header --- */
.header {
    background: linear-gradient(135deg, var(--green-deep) 0%, var(--green-mid) 100%);
    color: var(--white);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-md);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-icon {
    font-size: 1.8rem;
    line-height: 1;
}

.logo-text {
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

/* --- Navigation Tabs --- */
.nav-tabs {
    display: flex;
    gap: 4px;
    background: rgba(255,255,255,0.1);
    border-radius: var(--radius-md);
    padding: 3px;
}

.nav-tab {
    background: transparent;
    border: none;
    color: rgba(255,255,255,0.7);
    padding: 8px 18px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-sans);
}

.nav-tab:hover {
    color: var(--white);
    background: rgba(255,255,255,0.1);
}

.nav-tab.active {
    background: var(--white);
    color: var(--green-deep);
    box-shadow: var(--shadow-sm);
}

/* --- Profile Switcher --- */
.profile-switcher {
    display: flex;
    gap: 8px;
}

.profile-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,0.15);
    border: 2px solid transparent;
    color: var(--white);
    padding: 6px 14px 6px 6px;
    border-radius: 24px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-sans);
}

.profile-btn:hover {
    background: rgba(255,255,255,0.25);
}

.profile-btn.active {
    background: var(--white);
    color: var(--green-deep);
    border-color: var(--green-light);
    box-shadow: var(--shadow-sm);
}

.avatar-circle {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--green-light);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.profile-btn.active .avatar-circle {
    background: var(--green-deep);
}

/* --- Main Content --- */
.main-content {
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 24px 16px 48px;
}

/* --- Connect Prompt --- */
.connect-prompt {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 50vh;
}

.connect-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 48px 40px;
    text-align: center;
    max-width: 480px;
    width: 100%;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--brown-pale);
}

.connect-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.connect-card h2 {
    font-size: 1.6rem;
    color: var(--green-deep);
    margin-bottom: 12px;
}

.connect-card p {
    color: var(--slate-light);
    margin-bottom: 24px;
    font-size: 0.95rem;
    line-height: 1.7;
}

.btn-connect {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, #FC4C02 0%, #E34402 100%);
    color: var(--white);
    border: none;
    padding: 14px 32px;
    border-radius: 28px;
    font-size: 1.05rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 12px rgba(252,76,2,0.3);
    font-family: var(--font-sans);
}

.btn-connect:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(252,76,2,0.4);
}

.btn-connect:active {
    transform: translateY(0);
}

.strava-icon {
    font-size: 1.2rem;
}

.connect-note {
    font-size: 0.8rem !important;
    color: var(--slate-light) !important;
    opacity: 0.7;
    margin-top: 20px !important;
    margin-bottom: 0 !important;
}

/* --- Views --- */
.view {
    transition: opacity var(--transition-normal);
}

.view.hidden {
    display: none;
}

/* --- Section Headers --- */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}

.section-header h2 {
    font-size: 1.3rem;
    color: var(--green-deep);
    font-weight: 700;
}

.cached-badge {
    font-size: 0.75rem;
    background: var(--warning-light);
    color: var(--warning);
    padding: 4px 10px;
    border-radius: 12px;
    font-weight: 600;
}

.cached-badge.hidden {
    display: none;
}

/* --- Stat Cards Grid --- */
.stat-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0,0,0,0.04);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--green-light), var(--green-pale));
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.stat-card-icon {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.stat-card-value {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--green-deep);
    line-height: 1.2;
    margin-bottom: 4px;
}

.stat-card-label {
    font-size: 0.8rem;
    color: var(--slate-light);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-card-trend {
    font-size: 0.78rem;
    margin-top: 8px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 4px;
}

.stat-card-trend.up {
    color: var(--success);
}

.stat-card-trend.down {
    color: var(--danger);
}

.stat-card-trend.neutral {
    color: var(--slate-light);
}

/* --- Activity List --- */
.activity-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.activity-item {
    background: var(--white);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0,0,0,0.04);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: 16px;
}

.activity-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(2px);
    border-color: var(--green-pale);
}

.activity-item:active {
    transform: scale(0.995);
}

.activity-type-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
    width: 40px;
    text-align: center;
}

.activity-info {
    flex: 1;
    min-width: 0;
}

.activity-name {
    font-weight: 700;
    color: var(--slate);
    font-size: 0.95rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.activity-date {
    font-size: 0.78rem;
    color: var(--slate-light);
    margin-top: 2px;
}

.activity-stats-row {
    display: flex;
    gap: 16px;
    flex-shrink: 0;
    flex-wrap: wrap;
}

.activity-stat {
    text-align: center;
    min-width: 50px;
}

.activity-stat-value {
    font-weight: 700;
    color: var(--green-deep);
    font-size: 0.9rem;
}

.activity-stat-label {
    font-size: 0.65rem;
    color: var(--slate-light);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.activity-chevron {
    font-size: 1.2rem;
    color: var(--slate-light);
    flex-shrink: 0;
    transition: transform var(--transition-fast);
}

.activity-item.expanded .activity-chevron {
    transform: rotate(90deg);
}

/* --- Filter Bar --- */
.filter-bar {
    display: flex;
    gap: 8px;
    align-items: center;
}

.filter-select {
    padding: 8px 14px;
    border: 1px solid var(--brown-pale);
    border-radius: var(--radius-sm);
    background: var(--white);
    color: var(--slate);
    font-size: 0.85rem;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: border-color var(--transition-fast);
}

.filter-select:focus {
    outline: none;
    border-color: var(--green-light);
    box-shadow: 0 0 0 3px rgba(64,145,108,0.15);
}

/* --- Load More --- */
.load-more-container {
    text-align: center;
    margin-top: 24px;
}

.load-more-container.hidden {
    display: none;
}

.btn-load-more {
    background: var(--white);
    border: 2px solid var(--green-light);
    color: var(--green-mid);
    padding: 10px 28px;
    border-radius: 24px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    font-family: var(--font-sans);
}

.btn-load-more:hover {
    background: var(--green-light);
    color: var(--white);
}

.btn-load-more:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* --- Stats Period Tabs --- */
.stats-period-tabs {
    display: flex;
    gap: 4px;
    background: var(--white);
    border-radius: var(--radius-md);
    padding: 3px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
    width: fit-content;
}

.period-tab {
    background: transparent;
    border: none;
    color: var(--slate-light);
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-sans);
}

.period-tab:hover {
    color: var(--green-mid);
}

.period-tab.active {
    background: var(--green-mid);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

/* --- Chart Container --- */
.chart-container {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0,0,0,0.04);
    margin-top: 24px;
}

.chart-container h3 {
    font-size: 1.1rem;
    color: var(--green-deep);
    margin-bottom: 16px;
}

.chart-container canvas {
    width: 100%;
    max-width: 100%;
    height: auto;
}

/* --- Modal --- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    animation: fadeIn var(--transition-normal);
}

.modal-overlay.hidden {
    display: none;
}

.modal-content {
    background: var(--white);
    border-radius: var(--radius-xl);
    max-width: 800px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    position: relative;
    animation: slideUp var(--transition-slow);
}

.modal-close {
    position: sticky;
    top: 12px;
    right: 12px;
    float: right;
    z-index: 10;
    background: var(--white);
    border: 1px solid rgba(0,0,0,0.1);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    font-size: 1.3rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--slate);
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.modal-close:hover {
    background: var(--danger-light);
    color: var(--danger);
}

.modal-body {
    padding: 32px 28px;
}

/* --- Modal Activity Detail --- */
.modal-activity-header {
    margin-bottom: 24px;
}

.modal-activity-name {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--green-deep);
    margin-bottom: 4px;
}

.modal-activity-date {
    font-size: 0.9rem;
    color: var(--slate-light);
}

.modal-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 12px;
    margin-bottom: 24px;
}

.modal-stat {
    background: var(--off-white);
    border-radius: var(--radius-sm);
    padding: 14px;
    text-align: center;
}

.modal-stat-value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--green-deep);
}

.modal-stat-label {
    font-size: 0.7rem;
    color: var(--slate-light);
    text-transform: uppercase;
    letter-spacing: 0.3px;
    margin-top: 2px;
}

.modal-map-container {
    width: 100%;
    height: 300px;
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: 24px;
    border: 1px solid rgba(0,0,0,0.08);
}

.modal-elevation-container {
    margin-bottom: 24px;
}

.modal-elevation-container h3 {
    font-size: 1rem;
    color: var(--green-deep);
    margin-bottom: 12px;
}

.modal-elevation-container canvas {
    width: 100%;
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
}

.modal-achievements {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 24px;
}

.achievement-badge {
    background: var(--success-light);
    color: var(--success);
    padding: 6px 14px;
    border-radius: 16px;
    font-size: 0.8rem;
    font-weight: 600;
}

.modal-description {
    color: var(--slate-light);
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 16px;
}

/* --- Loading Spinner --- */
.loading-spinner {
    text-align: center;
    padding: 48px 0;
}

.loading-spinner.hidden {
    display: none;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--brown-pale);
    border-top-color: var(--green-mid);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 16px;
}

.loading-spinner p {
    color: var(--slate-light);
    font-size: 0.9rem;
}

/* --- Error Banner --- */
.error-banner {
    background: var(--danger-light);
    border: 1px solid var(--danger);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.error-banner.hidden {
    display: none;
}

.error-message {
    color: var(--danger);
    font-weight: 600;
    font-size: 0.9rem;
}

.btn-retry {
    background: var(--danger);
    color: var(--white);
    border: none;
    padding: 8px 18px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    font-size: 0.85rem;
    transition: background var(--transition-fast);
    font-family: var(--font-sans);
}

.btn-retry:hover {
    background: #9B2C2C;
}

/* --- Empty State --- */
.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--slate-light);
    font-size: 1rem;
}

.empty-state.hidden {
    display: none;
}

/* --- Footer --- */
.footer {
    background: var(--green-deep);
    color: rgba(255,255,255,0.7);
    text-align: center;
    padding: 20px 16px;
    font-size: 0.85rem;
}

.footer-sub {
    font-size: 0.75rem;
    opacity: 0.6;
    margin-top: 4px;
}

/* --- Animations --- */
@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --- Responsive: Tablet (768px+) --- */
@media (min-width: 768px) {
    .header-inner {
        padding: 14px 24px;
    }

    .logo-text {
        font-size: 1.6rem;
    }

    .main-content {
        padding: 32px 24px 56px;
    }

    .stat-cards-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
    }

    .stat-card {
        padding: 24px;
    }

    .stat-card-value {
        font-size: 1.8rem;
    }

    .activity-item {
        padding: 18px 24px;
    }

    .activity-stats-row {
        gap: 24px;
    }

    .modal-content {
        max-width: 90%;
    }

    .modal-map-container {
        height: 400px;
    }

    .modal-stats-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .connect-card {
        padding: 56px 48px;
    }
}

/* --- Responsive: Desktop (1024px+) --- */
@media (min-width: 1024px) {
    .header-inner {
        padding: 16px 32px;
    }

    .main-content {
        padding: 40px 32px 64px;
    }

    .stat-cards-grid {
        grid-template-columns: repeat(6, 1fr);
    }

    .activity-stats-row {
        gap: 32px;
    }

    .activity-stat {
        min-width: 60px;
    }

    .modal-content {
        max-width: 800px;
    }

    .modal-map-container {
        height: 450px;
    }

    .modal-stats-grid {
        grid-template-columns: repeat(6, 1fr);
    }
}

/* --- Accessibility --- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

:focus-visible {
    outline: 2px solid var(--green-light);
    outline-offset: 2px;
}

/* --- Print --- */
@media print {
    .header, .footer, .nav-tabs, .profile-switcher, .modal-overlay {
        display: none;
    }
    body {
        background: var(--white);
    }
    .stat-card, .activity-item {
        box-shadow: none;
        border: 1px solid #ddd;
        break-inside: avoid;
    }
}