/* ============================================================
   Dotobe 设计系统 · Serene Focus / Visible Progress / Gentle Feedback
   依赖：main.css → tokens.css → 本文件
   原则：增强而非破坏 —— ds- 前缀组件 + 兼容增强既有 main- / 通用态
   ============================================================ */

/* ---------- 全局基线增强 ---------- */
body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

::selection {
    background: rgba(59, 130, 246, 0.18);
    color: var(--color-text);
}

/* 焦点：键盘可见，鼠标不抢戏 */
:focus {
    outline: none;
}
:focus-visible {
    outline: none;
    box-shadow: var(--shadow-focus) !important;
    border-radius: var(--radius-sm);
}

a {
    transition: color var(--transition-fast), background var(--transition-fast), opacity var(--transition-fast);
}
button {
    transition:
        transform var(--transition-fast),
        box-shadow var(--transition-normal),
        background var(--transition-fast),
        color var(--transition-fast),
        border-color var(--transition-fast),
        filter var(--transition-fast);
}
button:active:not(:disabled) {
    transform: translateY(1px);
}

/* 滚动条 */
::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #CBD5E1, #B6C2D6);
    border-radius: var(--radius-full);
    border: 2px solid var(--color-surface-2);
}
::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, #93A6C4, #7C93B8);
}

/* ---------- 工具类 · 渐变 ---------- */
.bg-gradient-primary { background: var(--grad-primary) !important; }
.bg-gradient-growth  { background: var(--grad-growth) !important; }
.bg-gradient-alert   { background: var(--grad-alert) !important; }
.bg-gradient-soft    { background: var(--grad-primary-soft) !important; }

.text-gradient-primary {
    background: var(--grad-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

/* ---------- 关键帧动画 ---------- */
@keyframes ds-float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}
@keyframes ds-pulse-glow {
    0%, 100% { box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.35); }
    50% { box-shadow: 0 0 0 10px rgba(59, 130, 246, 0); }
}
@keyframes ds-shimmer {
    to { transform: translateX(100%); }
}
@keyframes ds-fadeUp {
    from { opacity: 0; transform: translateY(14px); }
    to   { opacity: 1; transform: none; }
}
@keyframes ds-pop {
    from { opacity: 0; transform: scale(0.96); }
    to   { opacity: 1; transform: scale(1); }
}
@keyframes ds-check-in {
    0%   { transform: scale(0) rotate(-20deg); opacity: 0; }
    60%  { transform: scale(1.15) rotate(4deg); opacity: 1; }
    100% { transform: scale(1) rotate(0); opacity: 1; }
}
@keyframes ds-progress-fill {
    from { width: 0; }
}

.ds-anim-float { animation: ds-float 3s ease-in-out infinite; }
.ds-anim-pulse-glow { animation: ds-pulse-glow 2s ease-in-out infinite; }
.ds-fade-up { animation: ds-fadeUp 0.45s var(--ease-out) both; }
.ds-pop { animation: ds-pop 0.3s var(--ease-spring) both; }

/* ---------- 卡片 ---------- */
.ds-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border-soft);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition:
        transform var(--transition-normal),
        box-shadow var(--transition-normal),
        border-color var(--transition-normal);
}
.ds-card:hover { box-shadow: var(--shadow-md); }
.ds-card-interactive { cursor: pointer; }
.ds-card-interactive:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(59, 130, 246, 0.35);
}
.ds-card-accent { position: relative; overflow: hidden; }
.ds-card-accent::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0; height: 4px;
    background: var(--grad-primary);
}

/* ---------- 按钮族 ---------- */
.ds-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.7rem 1.4rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    line-height: 1;
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition:
        transform var(--transition-fast),
        box-shadow var(--transition-normal),
        filter var(--transition-fast),
        background var(--transition-fast),
        color var(--transition-fast),
        border-color var(--transition-fast);
}
.ds-btn-primary {
    background: var(--grad-primary);
    color: #fff;
    box-shadow: var(--shadow-btn);
}
.ds-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-btn-lg);
    filter: brightness(1.05);
}
.ds-btn-primary:focus-visible {
    box-shadow: var(--shadow-btn), var(--shadow-focus) !important;
}
.ds-btn-outline {
    background: var(--color-surface);
    color: var(--color-primary);
    border: 1.5px solid rgba(59, 130, 246, 0.5);
}
.ds-btn-outline:hover {
    background: var(--color-primary-light);
    border-color: var(--color-primary);
    transform: translateY(-2px);
}
.ds-btn-ghost {
    background: var(--color-surface-3);
    color: var(--color-text);
}
.ds-btn-ghost:hover {
    background: #E6ECF5;
    transform: translateY(-2px);
}
.ds-btn-danger {
    background: var(--grad-danger);
    color: #fff;
    box-shadow: 0 8px 20px rgba(225, 29, 72, 0.28);
}
.ds-btn-danger:hover {
    transform: translateY(-2px);
    filter: brightness(1.05);
}
.ds-btn-sm { padding: 0.4rem 0.85rem; font-size: 0.85rem; border-radius: var(--radius-sm); }
.ds-btn-lg { padding: 0.95rem 1.9rem; font-size: 1.1rem; }
.ds-btn[disabled],
.ds-btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
    filter: none !important;
}

/* ---------- 徽章 / 标签 ---------- */
.ds-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.2rem 0.65rem;
    border-radius: var(--radius-full);
    font-size: 0.78rem;
    font-weight: 600;
    line-height: 1.5;
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
}
.ds-badge-success { background: var(--color-success-soft); color: #047857; }
.ds-badge-warning { background: var(--color-warning-soft); color: #B45309; }
.ds-badge-danger  { background: var(--color-danger-soft); color: var(--color-danger-text); }
.ds-badge-info    { background: var(--color-info-soft); color: var(--color-info); }
.ds-badge-purple  { background: #F5F3FF; color: #6D28D9; }
.ds-badge-outline {
    background: rgba(255, 255, 255, 0.7);
    border: 1.5px solid transparent;
    background-image:
        linear-gradient(var(--color-surface), var(--color-surface)),
        var(--grad-primary);
    background-origin: border-box;
    background-clip: padding-box, border-box;
    color: var(--color-primary);
}

/* ---------- 输入 ---------- */
.ds-input,
.ds-select,
.ds-textarea {
    width: 100%;
    padding: 0.7rem 0.9rem;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    color: var(--color-text);
    font: inherit;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.ds-input:hover,
.ds-select:hover,
.ds-textarea:hover {
    border-color: #C5CCD8;
}
.ds-input:focus,
.ds-select:focus,
.ds-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: var(--shadow-focus);
}

/* ---------- 页面标题栏 ---------- */
.ds-page-header { margin-bottom: 1.5rem; }
.ds-page-header .ds-title {
    font-size: var(--text-h2);
    font-weight: 600;
    letter-spacing: 0.2px;
    line-height: var(--leading-h2);
    background: var(--grad-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}
.ds-page-header .ds-subtitle {
    color: var(--color-text-secondary);
    margin-top: 0.3rem;
    font-size: var(--text-sm);
    line-height: var(--leading-sm);
}

/* ---------- 统计卡片 ---------- */
.ds-stat {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.1rem 1.2rem;
}
.ds-stat .ds-stat-icon {
    width: 3rem;
    height: 3rem;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.25rem;
    flex: 0 0 auto;
    background: var(--grad-primary);
    box-shadow: var(--shadow-btn);
}
.ds-stat .ds-stat-icon.success { background: var(--grad-growth); box-shadow: 0 8px 20px rgba(5, 150, 105, 0.28); }
.ds-stat .ds-stat-icon.warning { background: var(--grad-warning); }
.ds-stat .ds-stat-icon.purple  { background: var(--grad-purple); }
.ds-stat .ds-stat-icon.teal    { background: var(--grad-teal); }
.ds-stat .ds-stat-value {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.1;
}
.ds-stat .ds-stat-label {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-top: 0.15rem;
}

/* ---------- 进度条（成长渐变 + 光点） ---------- */
.ds-progress {
    position: relative;
    height: 10px;
    background: #E9ECF2;
    border-radius: var(--radius-full);
    overflow: visible;
}
.ds-progress__bar {
    position: relative;
    height: 100%;
    border-radius: var(--radius-full);
    background: var(--grad-growth);
    transition: width var(--transition-progress);
    min-width: 0;
}
.ds-progress__bar::after {
    content: '';
    position: absolute;
    right: -2px;
    top: 50%;
    width: 8px;
    height: 8px;
    margin-top: -4px;
    border-radius: 50%;
    background: #fff;
    box-shadow: 0 0 0 2px rgba(52, 211, 153, 0.5), 0 0 8px 2px rgba(5, 150, 105, 0.45);
}

/* ---------- 测验选项（温和反馈） ---------- */
.ds-quiz-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.95rem 1.1rem;
    background: var(--color-surface);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    cursor: pointer;
    text-align: left;
    transition:
        border-color var(--transition-normal),
        box-shadow var(--transition-normal),
        background var(--transition-normal),
        color var(--transition-normal),
        transform var(--transition-fast);
}
.ds-quiz-option:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-inset-glow);
}
.ds-quiz-option.is-selected {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
    box-shadow: var(--shadow-inset-glow);
}
.ds-quiz-option.is-correct {
    border: none;
    background: var(--grad-growth);
    color: #fff;
}
.ds-quiz-option.is-correct .ds-quiz-option__mark {
    animation: ds-check-in 0.3s var(--ease-spring) both;
}
.ds-quiz-option.is-wrong {
    border: none;
    background: var(--color-danger-bg);
    color: var(--color-danger-text);
}

/* ---------- 代码块（Mac 圆点 + 深底） ---------- */
.ds-code {
    position: relative;
    background: var(--grad-code);
    color: #E8E9F0;
    border-radius: var(--radius-md);
    padding: 1.25rem 1rem 1rem;
    font-family: var(--font-mono);
    font-size: var(--text-code);
    line-height: 1.7;
    overflow-x: auto;
    box-shadow: var(--shadow-md);
}
.ds-code::before {
    content: '';
    display: block;
    height: 10px;
    margin-bottom: 0.85rem;
    background:
        radial-gradient(circle at 6px 5px, #FF5F56 4px, transparent 5px),
        radial-gradient(circle at 22px 5px, #FFBD2E 4px, transparent 5px),
        radial-gradient(circle at 38px 5px, #27C93F 4px, transparent 5px);
}

/* ---------- 空状态 ---------- */
.ds-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3.5rem 1rem;
    text-align: center;
    color: var(--color-text-secondary);
}
.ds-empty .ds-empty-icon {
    width: 4.5rem;
    height: 4.5rem;
    border-radius: 50%;
    background: var(--grad-primary-soft);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: var(--color-primary);
    margin-bottom: 1rem;
}

/* ---------- 骨架屏 ---------- */
.ds-skeleton {
    position: relative;
    overflow: hidden;
    background: var(--color-surface-3);
    border-radius: var(--radius-sm);
}
.ds-skeleton::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.7), transparent);
    animation: ds-shimmer 1.4s infinite;
    transform: translateX(-100%);
}

/* ---------- 玻璃 / 分割 ---------- */
.ds-glass {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-glaze);
}
.ds-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-border-soft), transparent);
    border: none;
}

/* ---------- 增强既有 main- 组件 ---------- */
.main-btn-primary {
    background: var(--grad-primary);
    box-shadow: var(--shadow-btn);
}
.main-btn-primary:hover {
    background: var(--grad-primary);
    filter: brightness(1.06);
    box-shadow: var(--shadow-btn-lg);
}
.main-btn-secondary {
    border-color: rgba(59, 130, 246, 0.5);
}
.main-btn-secondary:hover {
    background: var(--color-primary-light);
    box-shadow: var(--shadow-sm);
}

/* 通用 btn 兼容（部分页面仍用 .btn.btn-primary） */
.btn.btn-primary,
button.btn-primary {
    background: var(--grad-primary);
    border: none;
    color: #fff;
    box-shadow: var(--shadow-btn);
    border-radius: var(--radius-md);
}
.btn.btn-primary:hover,
button.btn-primary:hover {
    filter: brightness(1.05);
    transform: translateY(-2px);
    box-shadow: var(--shadow-btn-lg);
}

/* ---------- 悬浮微提升 ---------- */
.ds-lift {
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}
.ds-lift:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
    .ds-card-interactive:hover,
    .ds-btn:hover,
    .ds-lift:hover,
    .main-btn-primary:hover,
    .main-btn-secondary:hover,
    .btn.btn-primary:hover {
        transform: none !important;
    }
    .ds-anim-float,
    .ds-anim-pulse-glow,
    .ds-fade-up,
    .ds-pop,
    .ds-skeleton::after {
        animation: none !important;
    }
    .ds-progress__bar {
        transition: none;
    }
}

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
    .ds-page-header .ds-title { font-size: 1.35rem; }
    .ds-btn { padding: 0.6rem 1.1rem; }
}