:root {
    --navy: #1B1F3B;
    --navy-light: #252a4d;
    --orange: #ff763c;
    --orange-light: #ff6937;
    --white: #ffffff;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background: var(--navy);
    color: var(--white);
}

.app-header {
    text-align: center;
    margin-bottom: 32px;
}

.app-logo {
    width: 80px;
    height: 80px;
    margin-bottom: 16px;
    border-radius: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

@media (max-width: 768px) {
    body {
        padding: 16px;
    }

    .app-header {
        margin-bottom: 24px;
    }

    .app-logo {
        width: 64px;
        height: 64px;
        margin-bottom: 12px;
    }

    h1 {
        font-size: 1.5rem;
        margin: 16px 0;
    }
}

.activity {
    border: 1px solid #ddd;
    padding: 10px;
    margin: 10px 0;
}

#login-container {
    text-align: center;
    margin: 20px 0;
}

.strava-btn {
    display: inline-block;
    background: var(--orange);
    color: var(--white);
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s ease;
    box-shadow: 0 4px 12px rgba(252, 76, 2, 0.3);
}

.strava-btn:hover {
    background: var(--orange-light);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(252, 76, 2, 0.4);
}

@media (max-width: 768px) {
    .strava-btn {
        padding: 10px 20px;
        font-size: 0.9rem;
        width: 100%;
        text-align: center;
    }
}

.total-stats {
    background: linear-gradient(145deg, var(--navy-light), var(--navy));
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

@media (max-width: 768px) {
    .total-stats {
        padding: 16px;
        margin-bottom: 16px;
    }

    .total-stats h2 {
        font-size: 1.3rem;
        margin: 0 0 12px 0;
    }

    .total-stats p {
        font-size: 0.9rem;
        margin: 8px 0;
    }
}

.total-stats h2 {
    margin-top: 0;
    color: var(--orange);
    font-size: 1.5rem;
}

.total-stats p {
    color: var(--white);
    opacity: 0.9;
    margin: 12px 0;
}

.leaderboard {
    background: linear-gradient(145deg, var(--navy-light), var(--navy));
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

@media (max-width: 768px) {
    .leaderboard {
        padding: 16px;
        margin-bottom: 16px;
    }

    .leaderboard h2 {
        font-size: 1.3rem;
        margin: 0 0 12px 0;
    }

    .leaderboard table {
        font-size: 0.9rem;
    }

    .leaderboard th, 
    .leaderboard td {
        padding: 8px 4px;
    }
}

.leaderboard table {
    width: 100%;
    border-collapse: collapse;
}

.leaderboard th,
.leaderboard td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--white);
}

.leaderboard th {
    font-weight: 600;
    color: rgba(255, 255, 255, 0.7);
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.5px;
}

.leaderboard tr:last-child td {
    border-bottom: none;
}

.leaderboard tr:nth-child(1) {
    font-weight: 600;
    color: var(--orange);
}

.leaderboard tr.current-user {
    background: rgba(252, 76, 2, 0.1);
    font-weight: 600;
    color: var(--orange);
}

/* Skeleton Loading Animation */
@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

.skeleton {
    background: var(--navy-light);
    border-radius: 8px;
    animation: skeleton-loading 1s infinite alternate;
}

.skeleton-title {
    height: 32px;
    margin-bottom: 16px;
    width: 60%;
}

.skeleton-text {
    height: 20px;
    margin-bottom: 12px;
}

.skeleton-progress {
    height: 10px;
    margin: 16px 0;
}

.skeleton-activity {
    height: 100px;
    margin-bottom: 16px;
}

.skeleton-table-row {
    display: flex;
    gap: 16px;
    margin-bottom: 12px;
}

.skeleton-table-cell {
    height: 24px;
    flex: 1;
}

@keyframes skeleton-loading {
    0% {
        opacity: 0.5;
    }
    100% {
        opacity: 0.2;
    }
}

@media (max-width: 768px) {
    .skeleton-title {
        height: 24px;
        margin-bottom: 12px;
    }

    .skeleton-text {
        height: 16px;
        margin-bottom: 8px;
    }

    .skeleton-activity {
        height: 80px;
        margin-bottom: 12px;
    }

    .skeleton-table-row {
        gap: 8px;
        margin-bottom: 8px;
    }

    .skeleton-table-cell {
        height: 20px;
    }
}

.activity-card {
    background: linear-gradient(145deg, var(--navy-light), var(--navy));
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 16px;
    color: var(--white);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.activity-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
    border-color: rgba(252, 76, 2, 0.3);
}

.activity-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.activity-date {
    font-size: 1.5rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.95);
    margin: 0;
}

.activity-distance {
    font-size: 1.5rem;
    font-weight: 600;
    color: #fc4c02;
    margin: 0;
    text-shadow: 0 0 20px rgba(252, 76, 2, 0.3);
}

.activity-details {
    display: flex;
    gap: 24px;
    margin-top: 8px;
    padding-top: 12px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

.activity-stat-label {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.5);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.activity-stat-value {
    font-size: 1rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
}

@media (max-width: 768px) {
    .activity-card {
        padding: 16px;
        margin-bottom: 12px;
    }

    .activity-date {
        font-size: 1.2rem;
    }

    .activity-distance {
        font-size: 1.2rem;
    }

    .activity-details {
        gap: 16px;
        padding-top: 10px;
    }

    .activity-stat-label {
        font-size: 0.8rem;
    }

    .activity-stat-value {
        font-size: 0.9rem;
    }
}

.activity-metrics {
    display: flex;
    justify-content: space-between;
    gap: 24px;
}

.metric {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
}

.metric-value {
    font-size: 1.4rem;
    font-weight: 600;
    color: #fc4c02;
}

.metric-label {
    font-size: 0.9rem;
    color: #666;
    text-transform: uppercase;
    margin-top: 4px;
}