:root {
    --primary: #0098EA;
    --primary-dark: #0080C7;
    --primary-light: #4DB8F0;
    --secondary: #8b5cf6;
    --success: #10b981;
    --success-dark: #059669;
    --danger: #ef4444;
    --danger-dark: #dc2626;
    --warning: #f59e0b;
    --dark-bg: #0f172a;
    --dark-surface: #1e293b;
    --dark-surface-light: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --border-color: #475569;
    --gradient-up: linear-gradient(135deg, #10b981 0%, #34d399 100%);
    --gradient-down: linear-gradient(135deg, #ef4444 0%, #f87171 100%);
    --gradient-primary: linear-gradient(135deg, #0098EA 0%, #4DB8F0 100%);
    --gradient-premium: linear-gradient(135deg, #ec4899 0%, #f59e0b 100%);
}

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

html, body {
    width: 100%;
    height: 100%;
    background: var(--dark-bg);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    overflow-x: hidden;
    -webkit-tap-highlight-color: transparent;
}

body { background-color: var(--dark-bg) !important; }

.app-container {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding-bottom: 70px;
}

/* Header */
.header {
    padding: 16px 20px;
    background: linear-gradient(180deg, var(--dark-surface) 0%, rgba(30,41,59,0.7) 100%);
    border-bottom: 1px solid var(--border-color);
}

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

.header h1 {
    font-size: 24px;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.streak-badge {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 6px 12px;
    background: rgba(239,68,68,0.15);
    border: 1px solid rgba(239,68,68,0.3);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 700;
    color: #f87171;
}

.streak-flame { animation: flicker 0.5s ease-in-out infinite alternate; }

@keyframes flicker {
    0%,19%,21%,23%,25%,54%,56%,100% { opacity:1; }
    20%,24%,55% { opacity:0.7; }
}

.header-stats {
    display: flex;
    justify-content: space-around;
}

.stat-item {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-light);
}

.stat-label {
    display: block;
    font-size: 11px;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Screens */
.screen { display: none; flex: 1; padding: 16px 20px; flex-direction: column; gap: 16px; }
.screen.active { display: flex; }

/* Price Card */
.price-card {
    background: var(--dark-surface);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    text-align: center;
}

.price-label {
    font-size: 13px;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.price-value {
    font-size: 42px;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 4px;
}

.price-change {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.price-change.up { color: var(--success); }
.price-change.down { color: var(--danger); }

.price-updated {
    font-size: 11px;
    color: var(--text-tertiary);
}

/* Countdown */
.countdown-card {
    background: var(--dark-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    text-align: center;
}

.countdown-label {
    font-size: 12px;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.countdown-timer {
    font-size: 28px;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: var(--warning);
}

.countdown-note {
    font-size: 11px;
    color: var(--text-tertiary);
    margin-top: 2px;
}

/* Predict Area */
.predict-area {
    text-align: center;
    padding: 16px 0;
}

.predict-area h2 {
    font-size: 20px;
    margin-bottom: 4px;
}

.predict-area p {
    color: var(--text-secondary);
    font-size: 13px;
    margin-bottom: 20px;
}

.predict-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.btn-up, .btn-down {
    border: none;
    border-radius: 16px;
    padding: 24px 20px;
    font-size: 20px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: white;
}

.btn-up {
    background: var(--gradient-up);
}

.btn-down {
    background: var(--gradient-down);
}

.btn-up:active, .btn-down:active {
    transform: scale(0.95);
}

.btn-up:disabled, .btn-down:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
}

.btn-arrow { font-size: 24px; }

/* Prediction Locked */
.prediction-locked {
    background: var(--dark-surface);
    border: 2px solid var(--primary);
    border-radius: 16px;
    padding: 24px;
    text-align: center;
}

.locked-icon { font-size: 40px; margin-bottom: 12px; }

.prediction-locked h3 {
    font-size: 18px;
    margin-bottom: 8px;
    color: var(--primary-light);
}

.prediction-locked p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 8px;
}

.locked-note {
    font-size: 12px !important;
    color: var(--text-tertiary) !important;
}

/* Upsell */
.upsell-section {
    padding: 8px 0;
}

.upsell-section h3 {
    font-size: 16px;
    text-align: center;
    margin-bottom: 12px;
}

.tier-cards {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.tier-card {
    background: var(--dark-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 14px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
}

.tier-popular {
    border-color: var(--primary);
    background: rgba(0,152,234,0.08);
}

.tier-badge {
    position: absolute;
    top: -8px;
    right: 12px;
    background: var(--gradient-premium);
    color: white;
    font-size: 9px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tier-name {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 2px;
}

.tier-price {
    font-size: 12px;
    color: var(--primary-light);
    font-weight: 600;
}

.tier-desc {
    font-size: 11px;
    color: var(--text-tertiary);
}

.btn-tier {
    border: none;
    background: var(--dark-surface-light);
    color: var(--text-primary);
    border-radius: 8px;
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
    flex-shrink: 0;
    margin-left: 12px;
}

.btn-tier-popular {
    background: var(--gradient-primary);
    color: white;
}

.btn-tier:active { transform: scale(0.95); }

/* Results */
.results-card {
    background: var(--dark-surface);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 20px;
}

.result-outcome {
    text-align: center;
    padding: 16px 0;
}

.result-outcome-icon { font-size: 48px; margin-bottom: 8px; }

.result-outcome h3 { font-size: 20px; margin-bottom: 4px; }

.result-correct h3 { color: var(--success); }
.result-wrong h3 { color: var(--danger); }

.result-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 16px;
}

.result-detail {
    background: var(--dark-bg);
    border-radius: 8px;
    padding: 12px;
    text-align: center;
}

.result-detail-label {
    font-size: 11px;
    color: var(--text-tertiary);
    text-transform: uppercase;
    margin-bottom: 4px;
}

.result-detail-value {
    font-size: 16px;
    font-weight: 700;
}

/* History */
.history-section h3 {
    font-size: 16px;
    margin-bottom: 12px;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.history-empty {
    text-align: center;
    color: var(--text-tertiary);
    padding: 20px;
    font-size: 13px;
}

.history-item {
    background: var(--dark-surface);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 12px 14px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.history-date { font-size: 12px; color: var(--text-tertiary); }
.history-direction { font-size: 14px; font-weight: 600; }
.history-direction.up { color: var(--success); }
.history-direction.down { color: var(--danger); }
.history-result { font-size: 18px; }

/* Leaderboard */
.leaderboard-header {
    text-align: center;
    margin-bottom: 16px;
}

.leaderboard-header h2 { font-size: 20px; }
.leaderboard-header p { color: var(--text-secondary); font-size: 13px; }

.leaderboard-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.lb-row {
    background: var(--dark-surface);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 12px 14px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.lb-row.lb-you {
    border-color: var(--primary);
    background: rgba(0,152,234,0.1);
}

.lb-rank {
    font-size: 16px;
    font-weight: 700;
    min-width: 28px;
    text-align: center;
}

.lb-rank-medal { font-size: 20px; }

.lb-info { flex: 1; }
.lb-name { font-size: 14px; font-weight: 600; }
.lb-streak { font-size: 11px; color: var(--text-tertiary); }

.lb-accuracy {
    font-size: 16px;
    font-weight: 700;
    color: var(--primary-light);
}

.leaderboard-you {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

/* Profile */
.profile-avatar {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    font-weight: 700;
    margin: 0 auto 12px;
}

#profileScreen h2 {
    text-align: center;
    font-size: 20px;
    margin-bottom: 16px;
}

.profile-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin-bottom: 16px;
}

.profile-stat {
    background: var(--dark-surface);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 12px 8px;
    text-align: center;
}

.profile-stat-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-light);
}

.profile-stat-label {
    font-size: 10px;
    color: var(--text-tertiary);
    text-transform: uppercase;
}

.profile-points {
    text-align: center;
    font-size: 24px;
    font-weight: 700;
    padding: 16px;
    background: var(--dark-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 16px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.profile-referral {
    background: var(--dark-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    text-align: center;
    margin-bottom: 16px;
}

.profile-referral h3 { font-size: 16px; margin-bottom: 4px; }
.profile-referral p { font-size: 13px; color: var(--text-secondary); margin-bottom: 12px; }

.referral-count {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-top: 8px;
}

/* Buttons */
.btn {
    border: none;
    border-radius: 12px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 20px;
}

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

.btn-primary:active { transform: scale(0.97); }

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

.btn-block { width: 100%; }

/* Tab Bar */
.tab-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    max-width: 500px;
    margin: 0 auto;
    display: flex;
    background: var(--dark-surface);
    border-top: 1px solid var(--border-color);
    z-index: 100;
    padding: 4px 0;
    padding-bottom: env(safe-area-inset-bottom, 4px);
}

.tab {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 8px 4px;
    background: none;
    border: none;
    color: var(--text-tertiary);
    font-size: 10px;
    cursor: pointer;
    transition: color 0.2s;
}

.tab.active { color: var(--primary-light); }
.tab-icon { font-size: 20px; }
.tab-label { font-weight: 600; }

/* Spinner */
.spinner-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(15,23,42,0.85);
    backdrop-filter: blur(4px);
    align-items: center;
    justify-content: center;
    flex-direction: column;
    z-index: 1000;
}

.spinner-overlay.active { display: flex; }

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 12px;
}

@keyframes spin { to { transform: rotate(360deg); } }

.spinner-text { color: var(--text-secondary); font-size: 14px; }

/* Responsive */
@media (max-width: 360px) {
    .header h1 { font-size: 20px; }
    .price-value { font-size: 36px; }
    .profile-stats { grid-template-columns: repeat(2, 1fr); }
    .btn-up, .btn-down { padding: 20px 16px; font-size: 18px; }
}