/* ============================
   Login Screen 2048
   ============================ */
.game-container.hidden {
    display: none !important;
}

.login-screen-2048 {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
    animation: fadeIn 0.5s ease-out;
}

.login-screen-2048 .back-home-btn {
    position: absolute;
    top: 20px;
    left: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.login-screen-2048 .back-home-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    transform: translateX(-3px);
}

.login-container-2048 {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    width: 100%;
    max-width: 400px;
}

.login-hero {
    text-align: center;
    margin-bottom: 10px;
}

.login-title {
    font-size: 5rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 50px rgba(102, 126, 234, 0.5);
}

.login-tagline {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-top: 8px;
}

.login-card {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 16px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 24px;
}

.login-card input {
    width: 100%;
    padding: 16px 20px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1.1rem;
    text-align: center;
    transition: all 0.3s ease;
}

.login-card input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 4px rgba(233, 69, 96, 0.15);
}

.login-card input::placeholder {
    color: var(--text-secondary);
}

.start-btn-2048 {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 16px 32px;
    background: var(--accent-gradient);
    border: none;
    border-radius: 14px;
    color: white;
    font-family: inherit;
    font-size: 1.2rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.start-btn-2048:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.6);
}

.start-btn-2048 svg {
    width: 24px;
    height: 24px;
}

/* Leaderboard 2048 */
.leaderboard-2048 {
    width: 100%;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 20px;
    margin-top: 10px;
}

.leaderboard-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.trophy-icon {
    font-size: 1.3rem;
}

.leaderboard-2048 ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.leaderboard-2048 li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.leaderboard-2048 li:hover {
    background: rgba(255, 255, 255, 0.08);
}

.leaderboard-2048 li.rank-1 {
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.15) 0%, rgba(255, 215, 0, 0.05) 100%);
    border: 1px solid rgba(255, 215, 0, 0.3);
}

.leaderboard-2048 li.rank-2 {
    background: linear-gradient(135deg, rgba(192, 192, 192, 0.12) 0%, rgba(192, 192, 192, 0.04) 100%);
    border: 1px solid rgba(192, 192, 192, 0.25);
}

.leaderboard-2048 li.rank-3 {
    background: linear-gradient(135deg, rgba(205, 127, 50, 0.12) 0%, rgba(205, 127, 50, 0.04) 100%);
    border: 1px solid rgba(205, 127, 50, 0.25);
}

.leaderboard-2048 li .rank-num {
    font-weight: 700;
    min-width: 28px;
    color: var(--text-secondary);
}

.leaderboard-2048 li .name {
    flex: 1;
    text-align: left;
    margin-left: 8px;
}

.leaderboard-2048 li .pts {
    font-weight: 700;
    color: var(--accent-primary);
}

.leaderboard-2048 li.loading {
    justify-content: center;
    color: var(--text-secondary);
}

/* Player Info Display */
.player-info {
    width: 100%;
    max-width: 450px;
    text-align: center;
    padding: 8px 16px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.player-info span {
    font-weight: 600;
    color: var(--accent-primary);
}

.login-screen-2048.hidden {
    display: none !important;
}