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

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    color: #eee;
}

.container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

h1 {
    font-size: 2.2rem;
    letter-spacing: 8px;
    color: #f0d9b5;
    text-shadow: 0 2px 10px rgba(240, 217, 181, 0.3);
}

/* ===== 大厅 ===== */
.lobby-box {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(240,217,181,0.2);
    border-radius: 16px;
    padding: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    min-width: 340px;
}

.btn-primary {
    width: 100%;
    padding: 14px 0;
    font-size: 1.15rem;
    background: #e94560;
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-family: inherit;
    transition: background 0.2s;
}
.btn-primary:hover { background: #c73650; }

.divider {
    width: 100%;
    text-align: center;
    position: relative;
    color: #888;
    font-size: 0.9rem;
}
.divider::before, .divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 38%;
    height: 1px;
    background: rgba(255,255,255,0.15);
}
.divider::before { left: 0; }
.divider::after { right: 0; }

.join-row {
    display: flex;
    gap: 8px;
    width: 100%;
}
.join-row input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid rgba(240,217,181,0.3);
    border-radius: 8px;
    background: rgba(0,0,0,0.3);
    color: #eee;
    font-size: 1rem;
    font-family: inherit;
    outline: none;
}
.join-row input::placeholder { color: #666; }
.join-row input:focus { border-color: #f0d9b5; }

.btn-secondary {
    padding: 12px 20px;
    font-size: 1rem;
    background: #0f3460;
    color: #f0d9b5;
    border: 1px solid #f0d9b5;
    border-radius: 8px;
    cursor: pointer;
    font-family: inherit;
    transition: background 0.2s;
    white-space: nowrap;
}
.btn-secondary:hover { background: #1a4a8a; }

.btn-local {
    padding: 10px 24px;
    font-size: 0.95rem;
    background: transparent;
    color: #aaa;
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 8px;
    cursor: pointer;
    font-family: inherit;
    transition: all 0.2s;
}
.btn-local:hover { color: #eee; border-color: rgba(255,255,255,0.3); }

/* ===== 等待界面 ===== */
.waiting-text {
    font-size: 1.2rem;
    color: #f0d9b5;
}
.room-id-label {
    font-size: 1rem;
    color: #aaa;
}
.room-id-label strong {
    font-size: 1.8rem;
    color: #f0d9b5;
    letter-spacing: 6px;
}
.share-box {
    display: flex;
    gap: 8px;
    width: 100%;
}
.share-box input {
    flex: 1;
    padding: 10px 14px;
    border: 1px solid rgba(240,217,181,0.3);
    border-radius: 8px;
    background: rgba(0,0,0,0.3);
    color: #eee;
    font-size: 0.9rem;
    font-family: inherit;
    outline: none;
}
.btn-copy {
    padding: 10px 16px;
    font-size: 0.9rem;
    background: #0f3460;
    color: #f0d9b5;
    border: 1px solid #f0d9b5;
    border-radius: 8px;
    cursor: pointer;
    font-family: inherit;
    white-space: nowrap;
}

/* ===== 游戏 ===== */
.info-panel {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: 600px;
    padding: 0 10px;
}

.player-info {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1rem;
}

.stone {
    display: inline-block;
    width: 24px;
    height: 24px;
    border-radius: 50%;
}

.black-stone {
    background: radial-gradient(circle at 35% 35%, #555, #111);
    box-shadow: 1px 1px 3px rgba(0,0,0,0.6);
}

.white-stone {
    background: radial-gradient(circle at 35% 35%, #fff, #ccc);
    box-shadow: 1px 1px 3px rgba(0,0,0,0.3);
}

.score-board {
    display: flex;
    gap: 20px;
    font-size: 1rem;
}
.score-board strong { color: #f0d9b5; }

.my-color {
    font-size: 0.85rem;
    padding: 4px 12px;
    border-radius: 12px;
    background: rgba(255,255,255,0.1);
}
.my-color.black { color: #f0d9b5; }
.my-color.white { color: #ccc; border: 1px solid rgba(255,255,255,0.2); }

#board {
    border-radius: 8px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    cursor: pointer;
}

.controls {
    display: flex;
    gap: 12px;
}

.controls button {
    padding: 10px 24px;
    font-size: 1rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}

#btn-restart { background: #e94560; color: #fff; }
#btn-restart:hover { background: #c73650; }

#btn-undo { background: #f0d9b5; color: #333; }
#btn-undo:hover { background: #d4c09a; }

.btn-lobby {
    background: #0f3460;
    color: #f0d9b5;
    border: 1px solid #f0d9b5 !important;
}
.btn-lobby:hover { background: #1a4a8a; }

/* ===== 弹窗 ===== */
.overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
}
.overlay.hidden { display: none; }

.overlay-content {
    background: linear-gradient(135deg, #1a1a2e, #16213e);
    padding: 48px 64px;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 16px 48px rgba(0,0,0,0.6);
    border: 2px solid #f0d9b5;
}
.overlay-content h2 {
    font-size: 2rem;
    margin-bottom: 24px;
    color: #f0d9b5;
}
.overlay-content button {
    padding: 12px 36px;
    font-size: 1.1rem;
    background: #e94560;
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-family: inherit;
}
.overlay-content button:hover { background: #c73650; }

.undo-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
}
.btn-accept {
    padding: 12px 36px !important;
    font-size: 1.1rem;
    background: #4caf50 !important;
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-family: inherit;
}
.btn-accept:hover { background: #3d9140 !important; }
.btn-reject {
    padding: 12px 36px !important;
    font-size: 1.1rem;
    background: #e94560 !important;
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-family: inherit;
}
.btn-reject:hover { background: #c73650 !important; }

.hidden { display: none !important; }