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

:root {
    --bg-primary: #000000;
    --bg-secondary: #0a0a0a;
    --bg-card: #1a1a1a;
    --border-color: #333;
    --text-primary: #ffffff;
    --text-secondary: rgba(255,255,255,0.7);
    --text-tertiary: rgba(255,255,255,0.5);
    --accent-cyan: #00ffff;
    --accent-pink: #ff006e;
    --accent-gold: #ffd700;
}

body.theme-light {
    --bg-primary: #f5f5f5;
    --bg-secondary: #ebebeb;
    --bg-card: #ffffff;
    --border-color: #d0d0d0;
    --text-primary: #0a0a0a;
    --text-secondary: rgba(0,0,0,0.7);
    --text-tertiary: rgba(0,0,0,0.5);
    --accent-cyan: #0099cc;
    --accent-pink: #cc0055;
    --accent-gold: #cc9900;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'SF Pro Display', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
    height: 100dvh;
    -webkit-font-smoothing: antialiased;
    transition: background 0.3s, color 0.3s;
    position: fixed;
    width: 100%;
}

.hidden {
    display: none !important;
}

.auth-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    height: 100dvh;
    padding: 20px;
}

.auth-container {
    text-align: center;
    max-width: 400px;
    width: 100%;
}

.logo {
    font-size: 80px;
    margin-bottom: 20px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.auth-container h1 {
    font-size: 48px;
    margin-bottom: 8px;
    font-weight: 900;
    letter-spacing: 4px;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.auth-subtitle {
    font-size: 16px;
    margin-bottom: 40px;
    color: var(--text-secondary);
    letter-spacing: 3px;
    text-transform: uppercase;
}

.auth-form {
    background: var(--bg-card);
    padding: 32px;
    border-radius: 16px;
    border: 2px solid var(--border-color);
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
    margin-bottom: 20px;
}

.auth-form input {
    width: 100%;
    padding: 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    margin-bottom: 20px;
    font-family: inherit;
    background: var(--bg-secondary);
    color: var(--text-primary);
    text-align: center;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    transition: all 0.3s;
}

.auth-form input:focus {
    outline: none;
    border-color: var(--accent-cyan);
    box-shadow: 0 0 20px rgba(0, 255, 255, 0.3);
}

.auth-note {
    font-size: 13px;
    color: var(--text-tertiary);
    line-height: 1.6;
}

#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh;
    max-width: 480px;
    margin: 0 auto;
    overflow: hidden;
    position: relative;
}

header {
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-secondary);
    border-bottom: 2px solid var(--border-color);
    gap: 12px;
    flex-shrink: 0;
}

.header-left h1 {
    font-size: 20px;
    font-weight: 900;
    letter-spacing: 2px;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.user-stats {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 4px;
}

.username-display {
    font-size: 11px;
    font-weight: 700;
    color: var(--accent-cyan);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.xp-display {
    font-size: 11px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
}

.level-badge {
    background: var(--bg-card);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 10px;
    border: 1px solid var(--border-color);
    letter-spacing: 1px;
}

.streak-display {
    font-size: 12px;
    font-weight: 700;
    color: var(--accent-pink);
}

.battle-status {
    display: flex;
    justify-content: space-around;
    padding: 16px;
    background: var(--bg-secondary);
    border-bottom: 2px solid var(--border-color);
    flex-shrink: 0;
}

.status-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.status-label {
    font-size: 10px;
    color: var(--text-tertiary);
    letter-spacing: 1px;
}

.status-value {
    font-size: 20px;
    font-weight: 900;
    color: var(--accent-cyan);
}

.view {
    display: none;
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    min-height: 0;
}

.view.active {
    display: flex;
    flex-direction: column;
}

.feed {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    min-height: 0;
}

.battle-card {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    width: 100%;
    max-width: 440px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
    animation: slideIn 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    transition: transform 0.3s, opacity 0.3s;
}

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

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.vibe-tag {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-pink));
    color: #fff;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 900;
    letter-spacing: 1px;
}

.timer-display {
    font-size: 14px;
    font-weight: 700;
    color: var(--accent-cyan);
    display: flex;
    align-items: center;
    gap: 6px;
}

.timer-display.urgent {
    color: var(--accent-pink);
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.battle-prompt {
    font-size: 22px;
    line-height: 1.3;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.battle-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    font-size: 12px;
    color: var(--text-secondary);
}

.battle-status {
    color: var(--accent-cyan);
    font-weight: 700;
    letter-spacing: 1px;
}

.battle-status.ended {
    color: var(--accent-pink);
}

.actions {
    display: flex;
    gap: 12px;
    margin-bottom: 12px;
}

.btn-for, .btn-against {
    flex: 1;
    padding: 16px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 900;
    cursor: pointer;
    letter-spacing: 2px;
    transition: all 0.2s;
    text-transform: uppercase;
}

.btn-for {
    background: var(--accent-cyan);
    color: #fff;
    box-shadow: 0 4px 20px rgba(0, 153, 204, 0.3);
}

.btn-for:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(0, 153, 204, 0.5);
}

.btn-for:active {
    transform: scale(0.98);
}

.btn-against {
    background: var(--accent-pink);
    color: #fff;
    box-shadow: 0 4px 20px rgba(204, 0, 85, 0.3);
}

.btn-against:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(204, 0, 85, 0.5);
}

.btn-against:active {
    transform: scale(0.98);
}

.btn-skip {
    width: 100%;
    padding: 12px;
    background: transparent;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-tertiary);
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    letter-spacing: 1px;
}

.btn-skip:hover {
    border-color: var(--text-secondary);
    color: var(--text-secondary);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-pink));
    color: #fff;
    padding: 16px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 900;
    cursor: pointer;
    letter-spacing: 2px;
    transition: all 0.2s;
    text-transform: uppercase;
    box-shadow: 0 4px 20px rgba(0, 153, 204, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(0, 153, 204, 0.5);
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-large {
    width: 100%;
    padding: 18px;
    font-size: 18px;
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    padding: 16px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    letter-spacing: 1px;
    transition: all 0.2s;
    text-transform: uppercase;
}

.btn-secondary:hover {
    border-color: var(--text-secondary);
    background: var(--bg-secondary);
}

.create-container, .leaderboard-container, .profile-container {
    flex: 1;
    padding: 24px 20px;
    padding-bottom: 24px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    min-height: 0;
}

.create-container h2, .leaderboard-container h2 {
    font-size: 28px;
    margin-bottom: 8px;
    font-weight: 900;
    letter-spacing: 2px;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 28px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-size: 11px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-secondary);
    letter-spacing: 1px;
}

.form-group textarea, .form-group select {
    width: 100%;
    padding: 14px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-family: inherit;
    transition: all 0.2s;
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

.form-group textarea:focus, .form-group select:focus {
    outline: none;
    border-color: var(--accent-cyan);
    box-shadow: 0 0 20px rgba(0, 153, 204, 0.2);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.char-count {
    text-align: right;
    font-size: 12px;
    color: var(--text-tertiary);
    margin-top: 6px;
}

.theme-selector {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
}

.theme-selector h3 {
    font-size: 16px;
    margin-bottom: 16px;
    letter-spacing: 2px;
}

.theme-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.theme-btn {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    padding: 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 12px;
    letter-spacing: 1px;
    color: var(--text-secondary);
}

.theme-btn:hover {
    border-color: var(--accent-cyan);
    transform: translateY(-2px);
}

.theme-btn.active {
    border-color: var(--accent-cyan);
    background: var(--bg-card);
    color: var(--accent-cyan);
}

.theme-preview {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
}

.dark-preview {
    background: linear-gradient(135deg, #000 0%, #1a1a1a 100%);
}

.light-preview {
    background: linear-gradient(135deg, #f5f5f5 0%, #fff 100%);
}

.leaderboard-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.leaderboard-item {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: all 0.2s;
}

.leaderboard-item:hover {
    border-color: var(--accent-cyan);
    box-shadow: 0 4px 20px rgba(0, 153, 204, 0.2);
}

.leaderboard-item.top-1 {
    border-color: var(--accent-gold);
    background: linear-gradient(135deg, var(--bg-card), rgba(255, 215, 0, 0.05));
}

.leaderboard-item.top-2 {
    border-color: #c0c0c0;
}

.leaderboard-item.top-3 {
    border-color: #cd7f32;
}

.leaderboard-rank {
    font-size: 24px;
    font-weight: 900;
    width: 40px;
    text-align: center;
}

.leaderboard-rank.top-1 {
    color: var(--accent-gold);
}

.leaderboard-rank.top-2 {
    color: #c0c0c0;
}

.leaderboard-rank.top-3 {
    color: #cd7f32;
}

.leaderboard-info {
    flex: 1;
}

.leaderboard-username {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 4px;
    color: var(--accent-cyan);
}

.leaderboard-stats {
    font-size: 12px;
    color: var(--text-tertiary);
}

.leaderboard-xp {
    font-size: 18px;
    font-weight: 900;
    color: var(--text-primary);
}

.profile-header {
    text-align: center;
    padding: 32px 0;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    margin-bottom: 24px;
}

.avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-pink));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    margin: 0 auto 16px;
    box-shadow: 0 8px 30px rgba(0, 153, 204, 0.4);
}

.profile-header h2 {
    font-size: 24px;
    font-weight: 900;
    letter-spacing: 2px;
    margin-bottom: 12px;
}

.profile-stats-inline {
    display: flex;
    justify-content: center;
    gap: 12px;
}

.level-badge-large {
    background: var(--bg-secondary);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 12px;
    border: 2px solid var(--border-color);
    letter-spacing: 1px;
    font-weight: 700;
}

.streak-badge-large {
    background: var(--bg-secondary);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 12px;
    border: 2px solid var(--accent-pink);
    letter-spacing: 1px;
    font-weight: 700;
    color: var(--accent-pink);
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    padding: 20px;
    border-radius: 12px;
    text-align: center;
}

.stat-card.win-card {
    border-color: var(--accent-cyan);
}

.stat-card.loss-card {
    border-color: var(--accent-pink);
}

.stat-value {
    font-size: 32px;
    font-weight: 900;
    margin-bottom: 4px;
}

.win-card .stat-value {
    color: var(--accent-cyan);
}

.loss-card .stat-value {
    color: var(--accent-pink);
}

.stat-label {
    font-size: 11px;
    color: var(--text-tertiary);
    letter-spacing: 1px;
}

.badges-section {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
}

.badges-section h3 {
    font-size: 16px;
    margin-bottom: 16px;
    letter-spacing: 2px;
}

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

.badge {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    padding: 12px;
    border-radius: 8px;
    text-align: center;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 1px;
}

.badge.locked {
    opacity: 0.3;
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
}

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

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    width: 90%;
    max-width: 460px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
    animation: slideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideUp {
    from { 
        transform: translateY(30px); 
        opacity: 0; 
    }
    to { 
        transform: translateY(0); 
        opacity: 1; 
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.modal-header h3 {
    font-size: 20px;
    font-weight: 900;
    letter-spacing: 2px;
    color: var(--accent-cyan);
}

.btn-close {
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    font-size: 24px;
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s;
}

.btn-close:hover {
    color: var(--text-primary);
}

.modal-prompt {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 15px;
    line-height: 1.5;
}

#argument-input {
    width: 100%;
    padding: 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    min-height: 140px;
    margin-bottom: 8px;
    resize: none;
    font-family: inherit;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: all 0.2s;
}

#argument-input:focus {
    outline: none;
    border-color: var(--accent-cyan);
    box-shadow: 0 0 20px rgba(0, 153, 204, 0.2);
}

.timer-bar {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 20px;
    height: 40px;
    margin: 20px 0;
    position: relative;
    overflow: hidden;
}

.timer-fill {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-pink));
    height: 100%;
    width: 100%;
    transition: width 1s linear;
}

.timer-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-weight: 900;
    font-size: 16px;
    color: #fff;
    text-shadow: 0 0 10px rgba(0,0,0,0.5);
    letter-spacing: 1px;
}

.winner-content {
    text-align: center;
}

.winner-icon {
    font-size: 80px;
    margin-bottom: 20px;
    animation: bounce 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes bounce {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.3); }
}

#winner-title {
    font-size: 32px;
    font-weight: 900;
    letter-spacing: 3px;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

#winner-message {
    font-size: 20px;
    font-weight: 700;
    color: var(--accent-cyan);
    margin-bottom: 24px;
}

nav {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 480px;
    display: flex;
    background: var(--bg-secondary);
    border-top: 2px solid var(--border-color);
    padding: 8px;
    padding-bottom: calc(8px + env(safe-area-inset-bottom));
    flex-shrink: 0;
    z-index: 100;
}

.nav-btn {
    flex: 1;
    padding: 14px 8px;
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    font-size: 11px;
    cursor: pointer;
    transition: all 0.2s;
    border-radius: 8px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.nav-btn:hover {
    color: var(--text-secondary);
    background: rgba(0, 153, 204, 0.05);
}

.nav-btn.active {
    color: var(--accent-cyan);
    background: rgba(0, 153, 204, 0.1);
    border: 2px solid var(--accent-cyan);
    padding: 12px 6px;
}