/* ========================================
   Interview Intro - 面试题库介绍页
   风格与首页一致：浅色底 + 主绿 #5d9743 + 白卡片
   ======================================== */

.ivi {
    /* 与头部 .header-inner 同宽（1500px + 两侧 16px 内边距） */
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    font-family: var(--font-family);
}

.ivi a { text-decoration: none; }

/* 锚点跳转时不被固定头部遮挡 */
.ivi-section[id],
.ivi-hero[id] { scroll-margin-top: calc(var(--header-height) + 16px); }

/* 平滑滚动（仅本页加载此样式，尊重系统减弱动效设置） */
@media (prefers-reduced-motion: no-preference) {
    html { scroll-behavior: smooth; }
}

/* 键盘可访问性：焦点态与主色一致 */
.ivi a:focus-visible,
.ivi button:focus-visible,
.ivi summary:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* ---------- 通用面板（白卡片） ---------- */
.ivi-panel {
    position: relative;
    background: rgba(255, 255, 255, 0.9);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 46px 40px 42px;
    overflow: hidden;
    transition: box-shadow var(--transition-normal);
}

.ivi-panel:hover { box-shadow: var(--shadow-md); }

.ivi-section { margin-top: var(--spacing-xl); }

/* ---------- 区块标题 ---------- */
.ivi-section-head {
    text-align: center;
    margin-bottom: 34px;
}

.ivi-overline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: var(--font-size-sm);
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--primary-color);
}

.ivi-overline i {
    width: 22px;
    height: 2px;
    border-radius: 2px;
    background: linear-gradient(90deg, var(--primary-color), #8fc972);
}

.ivi-section-title {
    margin: 10px 0 10px;
    font-size: 26px;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--text-primary);
}

.ivi-section-desc {
    margin: 0 auto;
    max-width: 560px;
    font-size: var(--font-size-base);
    line-height: 1.9;
    color: var(--text-secondary);
}

/* ================= Hero ================= */
.ivi-hero {
    position: relative;
    overflow: hidden;
    text-align: center;
    padding: 64px 40px 54px;
    border-radius: var(--radius-lg);
    background:
        radial-gradient(600px 260px at 88% -10%, rgba(93, 151, 67, 0.14), transparent 65%),
        radial-gradient(520px 240px at 4% 110%, rgba(143, 201, 114, 0.16), transparent 65%),
        rgba(255, 255, 255, 0.92);
    box-shadow: var(--shadow-sm);
}

.ivi-hero-glow {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
}

.ivi-hero-glow--1 {
    top: -70px;
    right: -60px;
    width: 220px;
    height: 220px;
    background: radial-gradient(circle, rgba(93, 151, 67, 0.20), transparent 70%);
}

.ivi-hero-glow--2 {
    bottom: -90px;
    left: -70px;
    width: 260px;
    height: 260px;
    background: radial-gradient(circle, rgba(143, 201, 114, 0.18), transparent 70%);
}

/* 顶部渐变高亮条（与文章卡一致的视觉语言） */
.ivi-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-dark), var(--primary-color), #8fc972);
}

/* 点阵纹理 */
.ivi-hero-dots {
    position: absolute;
    inset: 0;
    background-image: radial-gradient(rgba(93, 151, 67, 0.14) 1.2px, transparent 1.2px);
    background-size: 22px 22px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 0%, #000 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 0%, #000 20%, transparent 70%);
    pointer-events: none;
}

.ivi-hero-inner {
    position: relative;
    z-index: 1;
    max-width: 880px;
    margin: 0 auto;
}

.ivi-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    border-radius: 999px;
    border: 1px solid rgba(93, 151, 67, 0.25);
    background: var(--primary-lighter);
    color: var(--primary-dark);
    font-size: var(--font-size-sm);
    font-weight: 600;
    letter-spacing: 1px;
}

.ivi-badge-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--primary-color);
    box-shadow: 0 0 8px rgba(93, 151, 67, 0.6);
    animation: ivi-pulse 2s ease-in-out infinite;
}

@keyframes ivi-pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50%      { opacity: 0.5; transform: scale(0.8); }
}

.ivi-title {
    margin: 22px 0 16px;
    font-size: 52px;
    line-height: 1.15;
    font-weight: 800;
    letter-spacing: 6px;
    color: var(--text-primary);
}

.ivi-title-grad {
    background: linear-gradient(100deg, var(--primary-dark), var(--primary-color) 55%, #8fc972);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.ivi-lede {
    margin: 0 auto 30px;
    max-width: 620px;
    font-size: 15px;
    line-height: 2;
    color: var(--text-secondary);
}

/* 按钮 */
.ivi-cta {
    display: flex;
    justify-content: center;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 42px;
}

.ivi-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 30px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 1px;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal),
                background var(--transition-normal), color var(--transition-normal);
}

.ivi-btn--primary {
    color: #fff;
    background: linear-gradient(120deg, var(--primary-color), #6faa53);
    box-shadow: 0 6px 18px rgba(93, 151, 67, 0.35);
}

.ivi-btn--primary:hover {
    transform: translateY(-2px);
    background: linear-gradient(120deg, var(--primary-dark), var(--primary-color));
    box-shadow: 0 10px 26px rgba(93, 151, 67, 0.45);
}

.ivi-btn--ghost {
    color: var(--primary-dark);
    border: 1px solid rgba(93, 151, 67, 0.35);
    background: rgba(255, 255, 255, 0.7);
}

.ivi-btn--ghost:hover {
    transform: translateY(-2px);
    background: var(--primary-lighter);
    box-shadow: var(--shadow-md);
}

.ivi-btn--white {
    color: var(--primary-dark);
    background: #fff;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.15);
}

.ivi-btn--white:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(0, 0, 0, 0.2); }

.ivi-btn--outline {
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.65);
    background: rgba(255, 255, 255, 0.12);
}

.ivi-btn--outline:hover { transform: translateY(-2px); background: rgba(255, 255, 255, 0.22); }

/* Hero 统计 */
.ivi-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    margin: 0;
}

.ivi-stat {
    padding: 18px 10px 15px;
    border-radius: var(--radius-md);
    background: linear-gradient(180deg, var(--primary-bg), rgba(240, 247, 237, 0.5));
    border: 1px solid rgba(93, 151, 67, 0.14);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.ivi-stat:hover { transform: translateY(-3px); box-shadow: var(--shadow-sm); }

.ivi-stat dd {
    margin: 0 0 5px;
    font-size: 32px;
    font-weight: 800;
    line-height: 1.1;
    color: var(--primary-dark);
    font-variant-numeric: tabular-nums;
}

.ivi-stat dt {
    margin: 0;
    font-size: var(--font-size-sm);
    letter-spacing: 2px;
    color: var(--text-muted);
}

/* ================= 下载方向 Tabs ================= */
.ivi-dltabs-nav {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 26px;
    flex-wrap: wrap;
}

.ivi-dltab {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 22px;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    background: #fff;
    cursor: pointer;
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal),
                background var(--transition-normal), color var(--transition-normal),
                transform var(--transition-normal);
}

.ivi-dltab:hover {
    border-color: rgba(93, 151, 67, 0.45);
    color: var(--primary-dark);
    transform: translateY(-2px);
}

.ivi-dltab.is-active {
    border-color: var(--primary-color);
    background: linear-gradient(120deg, var(--primary-color), #6faa53);
    color: #fff;
    box-shadow: 0 6px 16px rgba(93, 151, 67, 0.3);
}

.ivi-dltab-icon { font-size: 16px; line-height: 1; }

.ivi-tab-panel { display: none; }
.ivi-tab-panel.is-active { display: block; animation: ivi-fade-in 0.35s ease; }

@keyframes ivi-fade-in {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ================= 下载分组（精简版 / 详细版） ================= */
.ivi-dl-group + .ivi-dl-group { margin-top: 20px; }

.ivi-dl-group-head {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.ivi-dl-group-badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 14px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--primary-dark);
    background: var(--primary-lighter);
    border: 1px solid rgba(93, 151, 67, 0.22);
}

.ivi-dl-group-badge--full {
    color: #fff;
    background: linear-gradient(120deg, var(--primary-color), #8fc972);
    border-color: transparent;
}

.ivi-dl-group-desc {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

/* 在线阅读卡片与分组间距 */
.ivi-dl--read { margin-top: 20px; }

/* ================= 下载卡片 ================= */
.ivi-download-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
}

.ivi-dl {
    position: relative;
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 18px 20px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: #fff;
    overflow: hidden;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal),
                border-color var(--transition-normal);
}

.ivi-dl-bar {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--bar, var(--primary-color));
}

.ivi-dl:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.1);
    border-color: rgba(93, 151, 67, 0.35);
}

.ivi-dl-icon {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    border-radius: var(--radius-md);
    background: var(--tint, var(--primary-lighter));
    color: var(--ink, var(--primary-color));
    transition: transform var(--transition-normal);
}

.ivi-dl:hover .ivi-dl-icon { transform: scale(1.08); }

.ivi-dl-name { flex: 1; min-width: 0; }

.ivi-dl-name strong {
    display: block;
    font-size: 15px;
    color: var(--text-primary);
    margin-bottom: 3px;
}

.ivi-dl-name small {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.ivi-dl-arrow {
    flex-shrink: 0;
    font-size: 18px;
    color: var(--text-muted);
    transition: transform var(--transition-normal), color var(--transition-normal);
}

.ivi-dl:hover .ivi-dl-arrow { transform: translateX(5px); color: var(--primary-color); }

/* ================= 版本对比 ================= */
.ivi-versions {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: stretch;
    gap: 18px;
    margin-top: 30px;
    padding-top: 30px;
    border-top: 1px dashed var(--border-color);
}

.ivi-version {
    position: relative;
    padding: 24px 24px 20px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: linear-gradient(180deg, #fff, #fafcfa);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.ivi-version:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }

.ivi-version--full {
    border-color: rgba(93, 151, 67, 0.35);
    background: linear-gradient(180deg, var(--primary-lighter), #fff);
}

.ivi-version-badge {
    display: inline-block;
    padding: 3px 12px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--text-muted);
    background: var(--bg-body);
    margin-bottom: 12px;
}

.ivi-version--full .ivi-version-badge {
    color: #fff;
    background: linear-gradient(120deg, var(--primary-color), #8fc972);
}

.ivi-version-name {
    margin: 0 0 8px;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
}

.ivi-version-desc {
    margin: 0 0 14px;
    font-size: 13px;
    line-height: 1.9;
    color: var(--text-secondary);
}

.ivi-version-list {
    list-style: none;
    margin: 0 0 16px;
    padding: 0;
}

.ivi-version-list li {
    position: relative;
    padding: 5px 0 5px 22px;
    font-size: 13px;
    color: var(--text-secondary);
}

.ivi-version-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    top: 5px;
    width: 16px;
    height: 16px;
    line-height: 16px;
    text-align: center;
    font-size: 11px;
    border-radius: 50%;
    color: #fff;
    background: var(--primary-color);
}

.ivi-version-tags { display: flex; gap: 8px; flex-wrap: wrap; }

.ivi-version-tags span {
    padding: 3px 12px;
    border-radius: 999px;
    font-size: var(--font-size-sm);
    color: var(--primary-dark);
    background: var(--primary-lighter);
    border: 1px solid rgba(93, 151, 67, 0.18);
}

.ivi-version-vs {
    display: flex;
    align-items: center;
    justify-content: center;
}

.ivi-version-vs span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    font-size: 15px;
    font-weight: 800;
    letter-spacing: 1px;
    color: #fff;
    background: linear-gradient(140deg, var(--primary-color), #8fc972);
    box-shadow: 0 6px 16px rgba(93, 151, 67, 0.35);
}

/* ================= 知识地图 Tabs ================= */
.ivi-maptabs-nav {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 26px;
    flex-wrap: wrap;
}

.ivi-maptab {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    background: #fff;
    cursor: pointer;
    font-family: inherit;
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal),
                background var(--transition-normal), transform var(--transition-normal);
}

.ivi-maptab:hover {
    border-color: rgba(93, 151, 67, 0.45);
    transform: translateY(-2px);
}

.ivi-maptab.is-active {
    border-color: var(--primary-color);
    background: linear-gradient(180deg, var(--primary-lighter), #fff);
    box-shadow: 0 6px 16px rgba(93, 151, 67, 0.18);
}

.ivi-maptab-icon { font-size: 20px; line-height: 1; }

.ivi-maptab-name {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
}

.ivi-maptab.is-active .ivi-maptab-name { color: var(--primary-dark); }

.ivi-maptab-meta {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    padding-left: 10px;
    border-left: 1px solid var(--border-color);
}

.ivi-map-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    padding-bottom: 16px;
    margin-bottom: 6px;
    border-bottom: 1px solid var(--border-light);
}

.ivi-map-head-total {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
}

.ivi-map-head-link {
    font-size: 13px;
    font-weight: 600;
    color: var(--primary-color);
    transition: color var(--transition-fast);
}

.ivi-map-head-link:hover { color: var(--primary-dark); text-decoration: underline; }

.ivi-map-cats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px 28px;
}

.ivi-map-cat-name {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 16px 0 10px;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--primary-dark);
}

.ivi-map-cat-name::before {
    content: '';
    width: 4px;
    height: 14px;
    border-radius: 2px;
    background: linear-gradient(180deg, var(--primary-color), #8fc972);
}

.ivi-map-subs { display: flex; flex-wrap: wrap; gap: 8px; }

.ivi-map-sub {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 6px 8px 6px 13px;
    border-radius: 999px;
    font-size: 13px;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    background: #fff;
    transition: color var(--transition-fast), border-color var(--transition-fast),
                transform var(--transition-fast), box-shadow var(--transition-fast);
}

.ivi-map-sub:hover {
    color: var(--primary-dark);
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(93, 151, 67, 0.18);
}

.ivi-map-sub-name {
    max-width: 220px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.ivi-map-sub-count {
    min-width: 22px;
    padding: 1px 7px;
    border-radius: 999px;
    text-align: center;
    font-size: 11px;
    font-weight: 700;
    color: var(--primary-dark);
    background: var(--primary-lighter);
}

/* ================= 特色 ================= */
.ivi-features {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
}

.ivi-feature {
    position: relative;
    padding: 24px 20px 20px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: #fff;
    overflow: hidden;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

/* 悬浮顶部高亮条（与文章卡一致） */
.ivi-feature::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), #8fc972);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.ivi-feature:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.ivi-feature:hover::before { transform: scaleX(1); }

.ivi-feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    margin-bottom: 14px;
    border-radius: var(--radius-md);
    font-size: 21px;
    background: var(--primary-lighter);
    border: 1px solid rgba(93, 151, 67, 0.18);
    transition: transform var(--transition-normal), background var(--transition-normal);
}

.ivi-feature:hover .ivi-feature-icon {
    transform: translateY(-2px) scale(1.06);
    background: #dff0d8;
}

.ivi-feature h3 {
    margin: 0 0 8px;
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
}

.ivi-feature p {
    margin: 0;
    font-size: 12.5px;
    line-height: 1.9;
    color: var(--text-secondary);
}

/* ================= 星级体系 ================= */
.ivi-stars {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
    margin-top: 30px;
    padding-top: 30px;
    border-top: 1px dashed var(--border-color);
}

.ivi-star-card {
    position: relative;
    text-align: center;
    padding: 26px 22px 22px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: linear-gradient(180deg, #fff, #fafcfa);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal),
                border-color var(--transition-normal);
}

.ivi-star-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.ivi-star-card--3:hover { border-color: rgba(245, 158, 11, 0.45); }

.ivi-star-icons {
    display: block;
    font-size: 26px;
    letter-spacing: 5px;
    margin-bottom: 12px;
}

.ivi-star-card--3 .ivi-star-icons { color: #f5a623; text-shadow: 0 2px 10px rgba(245, 166, 35, 0.35); }
.ivi-star-card--2 .ivi-star-icons { color: #9aa5b1; }
.ivi-star-card--1 .ivi-star-icons { color: var(--primary-light); }

.ivi-star-card h3 {
    margin: 0 0 8px;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--text-primary);
}

.ivi-star-card p {
    margin: 0 0 14px;
    font-size: 12.5px;
    line-height: 1.9;
    color: var(--text-secondary);
}

.ivi-star-tag {
    display: inline-block;
    padding: 4px 16px;
    border-radius: 999px;
    font-size: var(--font-size-sm);
    letter-spacing: 1px;
    color: var(--primary-dark);
    background: var(--primary-lighter);
    border: 1px solid rgba(93, 151, 67, 0.18);
}

.ivi-star-card--3 .ivi-star-tag {
    color: #b45309;
    background: #fef3c7;
    border-color: rgba(245, 158, 11, 0.3);
}

/* ================= FAQ ================= */
.ivi-faq {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.ivi-faq-item {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: #fff;
    overflow: hidden;
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.ivi-faq-item:hover { border-color: rgba(93, 151, 67, 0.35); }
.ivi-faq-item[open] { border-color: var(--primary-color); box-shadow: var(--shadow-sm); }

.ivi-faq-q {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 15px 18px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    list-style: none;
    user-select: none;
    transition: color var(--transition-fast);
}

.ivi-faq-q:hover { color: var(--primary-dark); }

.ivi-faq-q::-webkit-details-marker { display: none; }

.ivi-faq-icon {
    position: relative;
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-lighter);
    transition: transform var(--transition-normal), background var(--transition-normal);
}

.ivi-faq-icon::before,
.ivi-faq-icon::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 10px;
    height: 2px;
    border-radius: 2px;
    background: var(--primary-dark);
    transform: translate(-50%, -50%);
    transition: transform var(--transition-normal);
}

.ivi-faq-icon::after { transform: translate(-50%, -50%) rotate(90deg); }

.ivi-faq-item[open] .ivi-faq-icon { transform: rotate(180deg); background: var(--primary-color); }
.ivi-faq-item[open] .ivi-faq-icon::before,
.ivi-faq-item[open] .ivi-faq-icon::after { background: #fff; }
.ivi-faq-item[open] .ivi-faq-icon::after { transform: translate(-50%, -50%) rotate(0deg); }

.ivi-faq-a { padding: 0 18px 16px; }

.ivi-faq-a p {
    margin: 0;
    font-size: 13px;
    line-height: 1.9;
    color: var(--text-secondary);
}

/* ================= 底部 CTA ================= */
.ivi-cta-banner { margin: var(--spacing-xl) 0; }

.ivi-cta-banner-inner {
    position: relative;
    overflow: hidden;
    text-align: center;
    padding: 56px 24px;
    border-radius: var(--radius-lg);
    color: #fff;
    background:
        radial-gradient(500px 220px at 90% -20%, rgba(255, 255, 255, 0.18), transparent 60%),
        linear-gradient(130deg, var(--primary-dark), var(--primary-color) 55%, #6faa53);
    box-shadow: 0 14px 34px rgba(93, 151, 67, 0.3);
}

.ivi-cta-banner-inner::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(rgba(255, 255, 255, 0.16) 1.2px, transparent 1.2px);
    background-size: 22px 22px;
    mask-image: radial-gradient(ellipse 60% 70% at 50% 0%, #000 10%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 60% 70% at 50% 0%, #000 10%, transparent 70%);
    pointer-events: none;
}

.ivi-cta-banner-inner h2 {
    position: relative;
    margin: 0 0 10px;
    font-size: 28px;
    font-weight: 800;
    letter-spacing: 2px;
    font-family: "huiwen-micho", "Ma Shan Zheng", "STKaiti", "KaiTi", "楷体", serif;
}

.ivi-cta-banner-inner p {
    position: relative;
    margin: 0 0 28px;
    font-size: 14px;
    letter-spacing: 1px;
    opacity: 0.92;
}

.ivi-cta-banner-btns {
    position: relative;
    display: flex;
    justify-content: center;
    gap: 14px;
    flex-wrap: wrap;
}

/* ================= 滚动渐显 ================= */
.ivi-js .ivi-reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.ivi-js .ivi-reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ================= 响应式 ================= */
@media (max-width: 1200px) {
    .ivi-download-grid { grid-template-columns: repeat(2, 1fr); }
    .ivi-map-cats { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 992px) {
    .ivi-features { grid-template-columns: repeat(2, 1fr); }
    .ivi-map-cats { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .ivi-panel { padding: 32px 18px 28px; }
    .ivi-hero { padding: 48px 20px 40px; }
    .ivi-title { font-size: 36px; letter-spacing: 3px; }
    .ivi-stats { grid-template-columns: repeat(2, 1fr); }
    .ivi-download-grid { grid-template-columns: 1fr; }
    .ivi-versions { grid-template-columns: 1fr; }
    .ivi-version-vs span { width: 44px; height: 44px; margin: 0 auto; }
    .ivi-faq { grid-template-columns: 1fr; }
    .ivi-section-title { font-size: 22px; }
    .ivi-maptab-meta { display: none; }
}

@media (max-width: 560px) {
    .ivi-features { grid-template-columns: 1fr; }
    .ivi-stars { grid-template-columns: 1fr; }
    .ivi-dltab { padding: 8px 16px; font-size: 13px; }
}

/* ================= 无障碍：减弱动效 ================= */
@media (prefers-reduced-motion: reduce) {
    .ivi-badge-dot { animation: none; }
    .ivi-tab-panel.is-active { animation: none; }
    .ivi-js .ivi-reveal { opacity: 1; transform: none; transition: none; }
    .ivi-btn, .ivi-dl, .ivi-feature, .ivi-star-card, .ivi-map-sub, .ivi-dltab, .ivi-maptab {
        transition: none;
    }
}