/* ===== CSS Variables & Reset ===== */
:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-card: #1c2333;
    --bg-input: #0d1117;
    --border: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --green-1: #0d4d2b;
    --green-2: #1a7a45;
    --green-3: #27ae60;
    --green-4: #2ecc71;
    --green-5: #a8e6cf;
    --accent: #27ae60;
    --accent-hover: #2ecc71;
    --danger: #f85149;
    --warning: #d29922;
    --info: #58a6ff;
    --gold: #ffd700;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 2px 8px rgba(0,0,0,0.3);
    --transition: all 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

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

/* ===== Header ===== */
header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--green-4);
    white-space: nowrap;
}

.logo img { border-radius: 50%; }

nav {
    display: flex;
    gap: 0.25rem;
    flex-wrap: wrap;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    transition: var(--transition);
    white-space: nowrap;
}

.nav-link:hover { background: var(--bg-card); color: var(--text-primary); }
.nav-link.active { background: var(--green-1); color: var(--green-4); }

.header-right {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.user-badge {
    color: var(--green-4);
    font-weight: 600;
    font-size: 0.875rem;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

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

.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); }

.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

.btn-sm { padding: 0.375rem 0.75rem; font-size: 0.8rem; }

.btn-full { width: 100%; justify-content: center; }

/* ===== Container & Layout ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem;
}

.page { display: none; }
.page.visible { display: block; }

.page-header {
    margin-bottom: 1.5rem;
}

.page-header h2 {
    font-size: 1.75rem;
    margin-bottom: 0.25rem;
}

.page-header p {
    color: var(--text-secondary);
}

.grid {
    display: grid;
    gap: 1.5rem;
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); }

/* ===== Cards ===== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

.card h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.card-highlight {
    border-color: var(--green-2);
    background: linear-gradient(135deg, var(--bg-card) 0%, rgba(39, 174, 96, 0.08) 100%);
}

.card-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.card-header-row h3 { margin-bottom: 0; }

/* ===== Forms ===== */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.375rem;
    font-weight: 500;
}

.form-control, input[type="text"], input[type="password"], input[type="number"], input[type="email"], select, textarea {
    width: 100%;
    padding: 0.625rem 0.875rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: var(--transition);
}

.form-control:focus, input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(39, 174, 96, 0.15);
}

.form-row {
    display: flex;
    gap: 0.75rem;
    align-items: flex-end;
}

.flex-1 { flex: 1; }
.flex-2 { flex: 2; }

.error-msg {
    margin-top: 0.75rem;
    padding: 0.625rem;
    background: rgba(248, 81, 73, 0.1);
    border: 1px solid var(--danger);
    border-radius: var(--radius-sm);
    color: var(--danger);
    font-size: 0.85rem;
}

/* ===== Auth Page ===== */
.auth-container {
    max-width: 420px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.auth-logo {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-logo img {
    border-radius: 50%;
    box-shadow: 0 0 30px rgba(39, 174, 96, 0.3);
    margin-bottom: 1rem;
}

.auth-logo h1 {
    font-size: 1.75rem;
    color: var(--green-4);
}

.subtitle {
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.auth-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    padding: 4px;
}

.tab-btn {
    flex: 1;
    padding: 0.625rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    border-radius: 6px;
    transition: var(--transition);
}

.tab-btn.active {
    background: var(--accent);
    color: white;
}

.auth-form {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

/* ===== Progress Bar ===== */
.progress-bar-container {
    background: var(--bg-primary);
    border-radius: 20px;
    height: 32px;
    position: relative;
    overflow: hidden;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border);
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--green-1), var(--green-3), var(--green-4));
    border-radius: 20px;
    transition: width 1s ease;
    position: relative;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-weight: 700;
    font-size: 0.85rem;
    text-shadow: 0 1px 3px rgba(0,0,0,0.5);
}

/* ===== Stats ===== */
.goal-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
}

.stat {
    text-align: center;
    padding: 0.75rem;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--green-4);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ===== Events ===== */
.events-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
    max-height: 600px;
    overflow-y: auto;
    padding-right: 0.5rem;
}

.event-card {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1rem;
    transition: var(--transition);
    cursor: pointer;
}

.event-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.event-card .event-title {
    font-weight: 600;
    margin-bottom: 0.375rem;
    font-size: 0.95rem;
}

.event-card .event-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.event-card .event-amount {
    color: var(--green-4);
    font-weight: 700;
}

.event-card .event-badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: 600;
}

.badge-easy { background: rgba(39,174,96,0.15); color: var(--green-4); }
.badge-medium { background: rgba(210,153,34,0.15); color: var(--warning); }
.badge-hard { background: rgba(248,81,73,0.15); color: var(--danger); }

.filter-row {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.events-list {
    max-height: 600px;
    overflow-y: auto;
}

.event-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
    cursor: pointer;
}

.event-row:hover { background: var(--bg-primary); }

.event-row .event-info {
    flex: 1;
}

.event-row .event-info .title {
    font-weight: 600;
    font-size: 0.9rem;
}

.event-row .event-info .meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.event-row .event-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* ===== Pagination ===== */
.pagination {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.pagination button {
    padding: 0.5rem 0.875rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.85rem;
}

.pagination button:hover { border-color: var(--accent); }
.pagination button.active { background: var(--accent); border-color: var(--accent); }
.pagination button:disabled { opacity: 0.5; cursor: not-allowed; }

/* ===== Earnings ===== */
.earnings-list .earning-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
}

.earning-item .earning-info .title {
    font-weight: 600;
    font-size: 0.9rem;
}

.earning-item .earning-info .meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.earning-item .earning-amount {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--green-4);
    white-space: nowrap;
}

/* ===== Leaderboard ===== */
.leaderboard-table table {
    width: 100%;
    border-collapse: collapse;
}

.leaderboard-table th,
.leaderboard-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.leaderboard-table th {
    color: var(--text-secondary);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.leaderboard-table .position {
    font-weight: 700;
    color: var(--green-4);
    width: 50px;
}

.leaderboard-table .position-1 { color: var(--gold); }
.leaderboard-table .position-2 { color: #c0c0c0; }
.leaderboard-table .position-3 { color: #cd7f32; }

/* ===== Achievements ===== */
.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.achievement-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    text-align: center;
    transition: var(--transition);
}

.achievement-card.earned {
    border-color: var(--green-3);
    background: linear-gradient(135deg, var(--bg-card), rgba(39,174,96,0.1));
}

.achievement-card.locked {
    opacity: 0.5;
}

.achievement-card .ach-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.achievement-card .ach-name {
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.achievement-card .ach-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.achievement-card .ach-date {
    font-size: 0.75rem;
    color: var(--green-4);
    margin-top: 0.5rem;
}

/* ===== Ranks ===== */
.rank-display {
    text-align: center;
    padding: 1rem;
}

.rank-display .rank-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.rank-display .rank-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--green-4);
}

.rank-display .rank-level {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.rank-progress-display {
    text-align: center;
    padding: 1rem;
}

.ranks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 0.75rem;
}

.rank-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.75rem;
    text-align: center;
    transition: var(--transition);
    font-size: 0.85rem;
}

.rank-card.achieved {
    border-color: var(--green-3);
    background: rgba(39,174,96,0.08);
}

.rank-card.current {
    border-color: var(--green-4);
    background: rgba(39,174,96,0.15);
    box-shadow: 0 0 12px rgba(39,174,96,0.2);
}

.rank-card .rank-num {
    font-weight: 700;
    color: var(--text-muted);
    font-size: 0.75rem;
}

.rank-card .rank-icon {
    font-size: 1.5rem;
}

.rank-card .rank-name {
    font-weight: 600;
    font-size: 0.8rem;
}

.rank-card .rank-threshold {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* ===== Toast ===== */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: 0.875rem 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--green-3);
    border-radius: var(--radius-sm);
    color: var(--green-4);
    font-weight: 600;
    box-shadow: 0 4px 20px rgba(0,0,0,0.4);
    z-index: 1000;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* ===== Modal ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
}

.modal-body {
    padding: 1.5rem;
}

.modal-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
}

/* ===== Motivation ===== */
.motivation {
    font-size: 1rem;
    color: var(--green-4);
    font-style: italic;
}

/* ===== Utilities ===== */
.hidden { display: none !important; }
.text-center { text-align: center; }
.text-green { color: var(--green-4); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mb-1 { margin-bottom: 0.5rem; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .header-inner {
        flex-wrap: wrap;
        gap: 0.75rem;
    }

    nav { order: 3; width: 100%; overflow-x: auto; }

    .nav-link {
        padding: 0.375rem 0.5rem;
        font-size: 0.8rem;
    }

    .grid-2 { grid-template-columns: 1fr; }

    .form-row {
        flex-direction: column;
    }

    .events-grid {
        grid-template-columns: 1fr;
    }

    .goal-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .auth-container {
        padding: 1rem;
    }

    .filter-row {
        flex-direction: column;
    }
}