:root {
    --bg-primary: #2e384d;
    --bg-secondary: #3c4c5c;
    --bg-card: #47566a;
    --accent: #1b99de;
    --text-primary: #ffffff;
    --text-secondary: #9ca3af;
    --border-radius: 16px;
    --spacing: 16px;
}

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

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

#app {
    max-width: 480px;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding-bottom: 80px;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing);
    background: var(--bg-secondary);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-back {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 8px;
}

h1 {
    font-size: 20px;
    font-weight: 600;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.balance {
    display: flex;
    align-items: center;
    gap: 6px;
    background: var(--bg-card);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 16px;
    font-weight: 600;
}

.btn-deposit {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--accent);
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* User Info */
.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: var(--spacing);
}

.user-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--bg-card);
}

.user-name {
    font-size: 16px;
    font-weight: 600;
}

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

/* Main Content */
main {
    flex: 1;
    padding: 0 var(--spacing);
}

.screen {
    display: none;
}

.screen.active {
    display: block;
}

/* Cases Grid */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing);
    padding-bottom: var(--spacing);
}

.case-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 12px;
    cursor: pointer;
    transition: transform 0.2s;
    display: flex;
    flex-direction: column;
}

.case-card:active {
    transform: scale(0.95);
}

.case-image {
    width: 100%;
    height: 104px;
    object-fit: contain;
    object-position: center;
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.08);
    padding: 8px;
    box-sizing: border-box;
}

.case-name {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 8px;
    margin-bottom: 4px;
    min-height: 34px;
}

.case-name-main {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.case-price {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 18px;
    font-weight: 700;
}

/* Case Opening */

.prize-carousel {
    display: flex;
    overflow-x: auto;
    gap: var(--spacing);
    margin: var(--spacing) 0;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
}

.prize-carousel::-webkit-scrollbar {
    display: none;
}

.prize-item {
    min-width: 160px;
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 20px;
    text-align: center;
    scroll-snap-align: center;
}

.prize-emoji {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 72px;
    margin-bottom: 12px;
}

.prize-emoji-image {
    width: 64px;
    height: 64px;
    object-fit: contain;
}

.emoji-fallback {
    font-size: 48px;
    line-height: 1;
}

.prize-value {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    font-size: 18px;
    font-weight: 600;
}

.btn-primary {
    width: 100%;
    padding: 16px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
}

.btn-primary:active {
    opacity: 0.8;
}

.btn-large {
    font-size: 18px;
    padding: 20px;
}

.prize-list {
    margin-top: var(--spacing);
}

.prize-list h3 {
    font-size: 18px;
    margin: var(--spacing) 0 12px 0;
}

.prize-row {
    display: flex;
    align-items: center;
    background: var(--bg-card);
    border-radius: 12px;
    padding: 12px;
    margin-bottom: 8px;
}

.prize-icon {
    width: 48px;
    height: 48px;
    border-radius: 8px;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 12px;
}

.prize-icon-image {
    width: 34px;
    height: 34px;
    object-fit: contain;
}

.inventory-prize-emoji {
    margin-bottom: 0;
    min-height: auto;
}

.inventory-emoji-image {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.prize-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.prize-name {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 0;
}

.prize-info .prize-value {
    justify-content: flex-start;
}

/* Inventory */
.period-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: var(--spacing);
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: 4px;
}

.period-tab {
    flex: 1;
    padding: 10px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    border-radius: 12px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
}

.period-tab.active {
    background: var(--bg-card);
    color: var(--text-primary);
}

.inventory-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.inventory-item {
    aspect-ratio: 1;
    background: var(--bg-card);
    border-radius: 12px;
    padding: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    text-align: center;
    position: relative;
    gap: 6px;
}

.inventory-rank {
    position: absolute;
    top: 8px;
    left: 8px;
    font-size: 12px;
    color: var(--text-secondary);
}

.inventory-prize-name {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.2;
    min-height: 28px;
}

.inventory-withdraw-btn {
    margin-top: auto;
    width: 100%;
    border: none;
    border-radius: 10px;
    background: var(--accent-blue);
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    padding: 7px 8px;
    cursor: pointer;
}

.inventory-withdraw-btn:disabled {
    opacity: 0.7;
    cursor: wait;
}

/* Leaderboard */
.user-rank {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: var(--spacing);
    margin-bottom: var(--spacing);
}

#rankAvatar {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--bg-secondary);
    object-fit: cover;
    display: block;
}

#rankName {
    font-size: 18px;
    font-weight: 600;
}

#rankPosition {
    font-size: 14px;
    color: var(--text-secondary);
}

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

.leaderboard-item {
    display: flex;
    align-items: center;
    background: var(--bg-card);
    border-radius: 12px;
    padding: 12px;
}

.leaderboard-rank {
    width: 32px;
    font-size: 18px;
    font-weight: 700;
    text-align: center;
}

.leaderboard-rank.gold { color: #FFD700; }
.leaderboard-rank.silver { color: #C0C0C0; }
.leaderboard-rank.bronze { color: #CD7F32; }

.leaderboard-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-secondary);
    margin: 0 12px;
    object-fit: cover;
    display: block;
    flex-shrink: 0;
}

.leaderboard-info {
    flex: 1;
}

.leaderboard-name {
    font-size: 16px;
    font-weight: 600;
}

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

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

.history-item {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-card);
    border-radius: 12px;
    padding: 10px 12px;
}

.history-icon {
    width: 42px;
    height: 42px;
    border-radius: 10px;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.history-emoji-image {
    width: 28px;
    height: 28px;
    object-fit: contain;
}

.history-content {
    min-width: 0;
}

.history-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history-meta {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 2px;
}

.history-empty {
    text-align: center;
    color: var(--text-secondary);
    margin: 16px 0;
}

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    max-width: 480px;
    margin: 0 auto;
    background: var(--bg-secondary);
    display: flex;
    padding: 8px;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
}

.nav-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 8px;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 8px;
}

.nav-btn.active {
    color: var(--accent);
}

.nav-btn span {
    font-size: 12px;
}