/* buttons.css - 按钮组件 */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 10px 24px; border: none; border-radius: var(--radius);
    font-family: var(--font-main); font-size: 15px; font-weight: 600;
    cursor: pointer; transition: all 0.2s ease;
    background: var(--color-surface-light); color: var(--color-text);
    position: relative; overflow: hidden;
    /* 触控友好：最小点击区域 44×44 dp (WCAG 2.5.5) */
    min-height: 44px;
    min-width: 44px;
    touch-action: manipulation;
}
.btn::after {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.08), transparent 60%);
    pointer-events: none; opacity: 0; transition: opacity 0.2s;
}
.btn:hover::after { opacity: 1; }
.btn:hover { filter: brightness(1.15); transform: translateY(-1px); }
.btn:active { transform: translateY(0) scale(0.98); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none; filter: none; }

.btn--primary {
    background: var(--color-accent); color: #fff;
    box-shadow: 0 2px 8px rgba(78,168,222,0.2);
}
.btn--primary:hover { box-shadow: var(--glow-accent); }

.btn--gold {
    background: linear-gradient(135deg, var(--color-gold), var(--color-gold-dark));
    color: #1a1a1a; text-shadow: 0 1px 0 rgba(255,255,255,0.2);
    box-shadow: 0 2px 8px rgba(240,192,64,0.15);
}
.btn--gold:hover { box-shadow: var(--glow-gold); }

.btn--outline { background: transparent; border: 1.5px solid var(--color-text-dim); color: var(--color-text); }
.btn--outline:hover { border-color: var(--color-accent); background: var(--color-accent-dim); }
.btn--danger { background: var(--color-danger); color: #fff; box-shadow: 0 2px 8px rgba(231,76,60,0.2); }

.btn--large { padding: 14px 36px; font-size: 17px; border-radius: var(--radius-lg); }
.btn--small { padding: 6px 14px; font-size: 13px; border-radius: var(--radius-sm); min-width: 36px; }
.btn--full { width: 100%; }
.btn--back { background: transparent; color: var(--color-text-dim); padding: 6px 12px; font-size: 14px; }
.btn--back:hover { color: var(--color-text); }

/* 键盘 focus 可见性（无障碍）：鼠标点击不显示，键盘 Tab 会显示 */
.btn:focus { outline: none; }
.btn:focus-visible {
    outline: 2px solid var(--color-gold);
    outline-offset: 2px;
}

/* 场景退出按钮（BP / 卡牌对战等长流程场景用）
   视觉上做成小型"暂停"图标按钮，避免遮挡头部信息 */
.scene-exit-btn {
    position: absolute;
    top: 12px;
    right: 14px;
    z-index: 100;
    width: 34px;
    height: 34px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    color: rgba(255, 255, 255, 0.75);
    cursor: pointer;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.1s, box-shadow 0.15s;
    touch-action: manipulation;
    user-select: none;
    -webkit-user-select: none;
}
.scene-exit-btn__icon {
    font-size: 14px;
    line-height: 1;
    /* 视觉微调：⏸ 字符略偏小，放大一点且去掉 emoji 字体 */
    font-size: 16px;
    filter: drop-shadow(0 0 2px rgba(0, 0, 0, 0.6));
    transform: translateY(-1px);
}
.scene-exit-btn:hover {
    background: rgba(231, 76, 60, 0.4);
    border-color: rgba(231, 76, 60, 0.7);
    color: #fff;
    box-shadow: 0 0 12px rgba(231, 76, 60, 0.35);
}
.scene-exit-btn:active {
    transform: scale(0.92);
}
.scene-exit-btn:focus-visible {
    outline: 2px solid var(--color-danger);
    outline-offset: 2px;
}
@media (max-width: 480px) {
    .scene-exit-btn { top: 10px; right: 10px; width: 30px; height: 30px; }
    .scene-exit-btn__icon { font-size: 14px; }
}

/* 覆盖场景级 `.scene--battle > * { position: relative; z-index: 1; }` 规则，
   确保退出按钮始终浮动定位且层级高于弹幕等元素 */
.scene > .scene-exit-btn { position: absolute; z-index: 100; }