/**
 * Bytell 产品首页（index.html）专用样式
 * 设计主线：Bento 便当盒 —— 所有模块锁进同一个 CSS Grid，居中由网格保证
 * 依赖：css/style.css（设计令牌）、css/dark-mode.css（深色变量覆盖）
 * 回滚：删除本文件引用即可，不影响其它页面
 */

.landing-body {
    background: var(--color-bg-page);
    overflow-x: hidden;
    position: relative;
}

.landing-body main {
    display: block;
    flex: none;
    align-items: stretch;
    justify-content: flex-start;
    padding: 0;
    width: 100%;
}

:root {
    --lp-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

/* ============ 首页自用导航 ============ */
.lp-nav {
    position: fixed;
    top: var(--site-announce-h, 0px);
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 14px 0;
    transition: background .28s ease, backdrop-filter .28s ease, box-shadow .28s ease, top .22s ease;
}

#site-announcement {
    position: fixed !important;
    top: 0;
    left: 0;
    right: 0;
}

.lp-nav.scrolled {
    background: rgba(255, 255, 255, 0.86);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06);
}

[data-mode="dark"] .lp-nav.scrolled {
    background: rgba(13, 20, 32, 0.88);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06);
}

.lp-nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.lp-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: #f8fafc;
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: -0.4px;
    text-decoration: none;
    transition: opacity .2s ease;
}

.lp-logo:hover {
    opacity: .9;
    color: #f8fafc;
    text-decoration: none;
}

.lp-logo img {
    width: 32px;
    height: 32px;
    display: block;
}

.lp-nav.scrolled .lp-logo {
    color: var(--color-text-primary);
}

.lp-nav-menu {
    display: flex;
    align-items: center;
    gap: 6px;
}

.lp-nav-menu > a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border-radius: 999px;
    font-size: 0.92rem;
    font-weight: 600;
    color: rgba(226, 232, 240, 0.85);
    text-decoration: none;
    transition: color .2s ease, background .2s ease;
}

.lp-nav-menu > a:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.08);
}

.lp-nav.scrolled .lp-nav-menu > a {
    color: var(--color-text-secondary);
}

.lp-nav.scrolled .lp-nav-menu > a:hover {
    color: var(--color-text-primary);
    background: var(--color-bg-hover);
}

.lp-nav-menu > a.active {
    color: var(--theme-primary) !important;
    background: rgba(var(--theme-primary-rgb), 0.10);
}

.lp-nav-cta {
    background: rgba(var(--theme-primary-rgb), 0.14) !important;
    border: 1px solid rgba(var(--theme-accent-rgb), 0.32);
    color: var(--theme-accent) !important;
    margin-left: 4px;
}

/* 首页导航右侧用户区（#user-slot）：与课程页共用 js/auth.js 的 renderUserSlot，
   未登录渲染 .ba-login-btn，已登录渲染 .ba-user 头像下拉菜单。
   这里把登录按钮外观调成与 .lp-nav-cta 一致，并修正定位使其融入导航条。 */
.lp-nav-menu > #user-slot {
    display: inline-flex;
    align-items: center;
}

.lp-nav-menu > #user-slot .ba-login-btn {
    background: rgba(var(--theme-primary-rgb), 0.14) !important;
    border: 1px solid rgba(var(--theme-accent-rgb), 0.32) !important;
    border-radius: 999px;
    color: var(--theme-accent) !important;
    padding: 7px 14px;
    font-size: 0.92rem;
    font-weight: 600;
    white-space: nowrap;
    transition: background .2s ease, border-color .2s ease;
}

.lp-nav-menu > #user-slot .ba-login-btn:hover {
    background: rgba(var(--theme-primary-rgb), 0.22) !important;
    border-color: rgba(var(--theme-accent-rgb), 0.50) !important;
}

.lp-nav-menu > #user-slot .ba-user {
    margin-left: 0;
    position: relative;
    display: inline-flex;
    align-items: center;
}

.lp-nav-menu > #user-slot .ba-avatar-btn {
    border: 0;
    background: transparent;
    box-shadow: none;
    width: 32px;
    height: 32px;
    border-radius: 999px;
    color: var(--theme-accent) !important;
}

.lp-nav-menu > #user-slot .ba-avatar-btn:hover {
    background: rgba(255, 255, 255, 0.08);
}

.lp-nav-toggle {
    display: none;
    background: transparent;
    border: none;
    color: #f8fafc;
    font-size: 1.55rem;
    padding: 6px;
    cursor: pointer;
}

.lp-nav.scrolled .lp-nav-toggle {
    color: var(--color-text-primary);
}

/* ============ 通用骨架 ============ */
.lp-section {
    padding: 88px 0;
    position: relative;
}

.lp-section-alt {
    background: var(--color-bg-muted);
    border-top: 1px solid var(--color-border-muted);
    border-bottom: 1px solid var(--color-border-muted);
}

.lp-head {
    text-align: center;
    max-width: 760px;
    margin: 0 auto 48px;
}

.lp-eyebrow {
    display: inline-block;
    font-size: 0.82rem;
    letter-spacing: 2px;
    color: var(--theme-primary-dark);
    background: var(--theme-primary-bg);
    border: 1px solid var(--theme-primary-border);
    border-radius: 999px;
    padding: 5px 16px;
    margin-bottom: 18px;
    font-weight: 600;
}

.lp-title {
    font-size: clamp(1.65rem, 3.4vw, 2.5rem);
    font-weight: 800;
    color: var(--color-text-primary);
    letter-spacing: -0.5px;
    margin: 0 0 14px;
    line-height: 1.28;
}

.lp-subtitle {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin: 0;
}

/* ============ HERO ============ */
.hero {
    position: relative;
    background: linear-gradient(150deg, #0b1322 0%, #101d33 45%, #0d1a2e 100%);
    padding: 128px 0 132px;
    overflow: hidden;
    color: #e2e8f0;
}

.hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    pointer-events: none;
}

.hero-glow-1 {
    width: 540px;
    height: 540px;
    left: -170px;
    top: -140px;
    background: radial-gradient(circle, rgba(var(--theme-primary-rgb), 0.30), transparent 65%);
}

.hero-glow-2 {
    width: 470px;
    height: 470px;
    right: -150px;
    bottom: -170px;
    background: radial-gradient(circle, rgba(var(--theme-accent-rgb), 0.24), transparent 65%);
}

.hero-grid-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
    opacity: .55;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.028) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.028) 1px, transparent 1px);
    background-size: 46px 46px;
    -webkit-mask-image: radial-gradient(ellipse at 50% 40%, #000 30%, transparent 76%);
    mask-image: radial-gradient(ellipse at 50% 40%, #000 30%, transparent 76%);
}

.hero-inner {
    position: relative;
    z-index: 2;
}

.hero-core {
    display: grid;
    grid-template-columns: 1.22fr 0.78fr;
    gap: 32px;
    align-items: center;
    padding: 28px 0 20px;
}

.hero-text {
    text-align: left;
}

.hero-vision {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 0.86rem;
    font-weight: 600;
    color: var(--theme-accent);
    background: rgba(var(--theme-primary-rgb), 0.10);
    border: 1px solid rgba(var(--theme-accent-rgb), 0.25);
    border-radius: 999px;
    padding: 6px 16px;
    margin-bottom: 24px;
    letter-spacing: .5px;
}

.hero-vision-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--theme-primary);
    animation: lp-pulse 1.8s ease-in-out infinite;
}

.hero-title {
    font-size: clamp(2.2rem, 4.6vw, 3.6rem);
    font-weight: 800;
    letter-spacing: -2px;
    color: #f8fafc;
    margin: 0 0 20px;
    line-height: 1.22;
}

.hero-title-line {
    display: block;
}

.hero-title-accent {
    /* 第二行整体右移两格，与第一行形成错位；缩进写在 CSS 里，窄屏统一归零 */
    display: inline-block;
    padding-left: 2em;
    color: var(--theme-primary);
    background: linear-gradient(135deg, var(--theme-primary) 0%, var(--theme-accent) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -1.5px;
}

.hero-intro-block {
    display: inline-block;
    max-width: 100%;
    vertical-align: top;
}

.hero-badges {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 0 0 22px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    font-size: 0.86rem;
    font-weight: 700;
    color: rgba(226, 232, 240, 0.85);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 999px;
    padding: 7px 14px;
}

.hero-badge i {
    font-size: 1em;
    color: var(--theme-primary);
}

.hero-desc {
    font-size: clamp(0.92rem, 1.4vw, 1.05rem);
    color: rgba(226, 232, 240, 0.58);
    line-height: 1.75;
    margin: 0 0 28px;
}

.hero-actions {
    display: inline-flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: flex-start;
    margin-bottom: 32px;
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: 22px;
    flex-wrap: wrap;
}

.hero-stat {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 8px 14px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.hero-stat > i {
    font-size: 1.1rem;
    color: var(--theme-primary);
}

.hero-stat-num {
    font-family: var(--lp-mono);
    font-size: 1.25rem;
    font-weight: 800;
    color: #f8fafc;
    letter-spacing: -1px;
    line-height: 1;
}

.hero-stat-label {
    font-size: 0.8rem;
    color: rgba(226, 232, 240, 0.55);
}

.hero-visual {
    display: flex;
    align-items: center;
    justify-content: flex-end;
}

.hero-visual-svg {
    width: 100%;
    max-width: none;
    height: auto;
    display: block;
    filter: drop-shadow(0 24px 48px rgba(0, 0, 0, 0.28));
}

/* 课程截图堆叠轮播 */
.hero-stack {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 10;
    max-width: 620px;
    margin-left: auto;
}

.hero-stack-card {
    position: absolute;
    inset: 0;
    border-radius: 14px;
    overflow: hidden;
    background: var(--color-bg-surface);
    border: none;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.28);
    transform: scale(0.88) translateY(18px) rotate(-4deg);
    opacity: 0.45;
    transition: transform .7s cubic-bezier(.34,1.56,.64,1), opacity .5s ease, z-index 0s .35s;
    z-index: 1;
}

.hero-stack-card:nth-child(2) {
    transform: scale(0.88) translateY(18px) rotate(-5deg);
}

.hero-stack-card:nth-child(3) {
    transform: scale(0.88) translateY(18px) rotate(4deg);
}

.hero-stack-card:nth-child(4) {
    transform: scale(0.88) translateY(18px) rotate(-6deg);
}

.hero-stack-card:nth-child(5) {
    transform: scale(0.88) translateY(18px) rotate(3deg);
}

.hero-stack-card:nth-child(6) {
    transform: scale(0.88) translateY(18px) rotate(-4deg);
}

.hero-stack-card:nth-child(7) {
    transform: scale(0.88) translateY(18px) rotate(5deg);
}

.hero-stack-card:nth-child(8) {
    transform: scale(0.88) translateY(18px) rotate(-3deg);
}

.hero-stack-card:nth-child(9) {
    transform: scale(0.88) translateY(18px) rotate(4deg);
}

.hero-stack-card:nth-child(10) {
    transform: scale(0.88) translateY(18px) rotate(-5deg);
}

.hero-stack-card:nth-child(11) {
    transform: scale(0.88) translateY(18px) rotate(3deg);
}

.hero-stack-card.active {
    transform: scale(1) translateY(0) rotate(0deg);
    opacity: 1;
    z-index: 10;
    transition: transform .7s cubic-bezier(.34,1.56,.64,1), opacity .5s ease, z-index 0s;
}

.hero-stack-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
}

/* 浏览器窗口装饰条 */
.hero-stack-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 24px;
    background: rgba(255, 255, 255, 0.06);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    z-index: 2;
}

.hero-stack-card::after {
    content: '● ● ●';
    position: absolute;
    top: 5px;
    left: 12px;
    font-size: 8px;
    letter-spacing: 4px;
    color: rgba(255, 255, 255, 0.35);
    z-index: 3;
}

.hero-wave {
    position: absolute;
    left: 0;
    right: 0;
    bottom: -1px;
    line-height: 0;
    z-index: 1;
}

.hero-wave svg {
    display: block;
    width: 100%;
    height: 80px;
}

/* ============ 按钮 ============ */
.btn-hero-primary,
.btn-lp-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 26px;
    border-radius: 11px;
    background: linear-gradient(135deg, var(--theme-primary), var(--theme-primary-dark));
    color: #fff;
    font-weight: 700;
    font-size: 0.95rem;
    text-decoration: none;
    border: none;
    box-shadow: 0 10px 26px rgba(var(--theme-primary-rgb), 0.32), 0 0 0 0 rgba(var(--theme-primary-rgb), 0.35);
    transition: transform .2s ease, box-shadow .2s ease;
}

.btn-hero-primary:hover,
.btn-lp-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 34px rgba(var(--theme-primary-rgb), 0.42), 0 0 28px rgba(var(--theme-primary-rgb), 0.28);
    color: #fff;
    text-decoration: none;
}

.btn-hero-ghost {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 24px;
    border-radius: 11px;
    background: rgba(255, 255, 255, 0.075);
    border: 1px solid rgba(255, 255, 255, 0.17);
    color: #e2e8f0;
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    transition: background .2s ease, color .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.btn-hero-ghost:hover {
    background: rgba(255, 255, 255, 0.13);
    border-color: rgba(255, 255, 255, 0.28);
    color: #fff;
    box-shadow: 0 0 24px rgba(255, 255, 255, 0.08);
    text-decoration: none;
}

/* ============ BENTO 主面板 ============ */
.bento {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    max-width: 1120px;
    margin: 0 auto;
}

.bento-cell {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: 14px;
    padding: 22px 20px;
    transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}

.bento-cell:hover {
    transform: translateY(-4px);
    border-color: var(--theme-primary-border-strong);
    box-shadow: 0 10px 26px rgba(var(--theme-primary-rgb), 0.14);
}

.bento-cell--lead {
    grid-column: span 2;
    grid-row: span 2;
}

.bento-cell--wide {
    grid-column: span 2;
}

.bento-cell-head {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 6px;
}

.bento-cell-icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: 11px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.15rem;
    color: #fff;
    background: linear-gradient(135deg, var(--theme-primary) 0%, var(--theme-primary-dark) 100%);
    box-shadow: 0 6px 16px rgba(var(--theme-primary-rgb), 0.26);
}

.bento-cell-title {
    font-size: 1.05rem;
    font-weight: 800;
    color: var(--color-text-primary);
    margin: 0;
}

.bento-cell-name {
    font-size: 0.98rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin: 14px 0 6px;
}

.bento-cell-desc {
    font-size: 0.88rem;
    line-height: 1.7;
    color: var(--color-text-secondary);
    margin: 0;
}

.bento-mini {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-top: 18px;
}

.bento-mini-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 14px 14px 15px;
    border-radius: 11px;
    background: var(--color-bg-muted);
    border: 1px solid var(--color-border-muted);
}

.bento-mini-item i {
    width: 28px;
    height: 28px;
    border-radius: 7px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    color: var(--theme-primary-dark);
    background: var(--theme-primary-bg);
    border: 1px solid var(--theme-primary-border);
    margin-bottom: 6px;
}

.bento-mini-name {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-text-primary);
}

.bento-mini-desc {
    font-size: 0.8rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
}

.bento-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 14px;
}

.bento-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 13px;
    border-radius: 999px;
    background: var(--theme-primary-bg);
    border: 1px solid var(--theme-primary-border);
    font-size: 0.86rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.bento-badge b {
    font-family: var(--lp-mono);
    font-size: 0.8rem;
    color: var(--theme-primary);
}

/* ============ 教学流程 ============ */
.steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    max-width: 1120px;
    margin: 0 auto;
}

.step {
    padding: 22px 20px 24px;
    border-radius: 14px;
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
}

.step-num {
    font-family: var(--lp-mono);
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--theme-primary);
    margin-bottom: 4px;
}

.step-name {
    font-size: 1.05rem;
    font-weight: 800;
    color: var(--color-text-primary);
    margin-bottom: 14px;
}

.step-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 5px 0;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    border-top: 1px dashed var(--color-border-muted);
}

.step-row:first-of-type {
    border-top: none;
}

.step-role {
    flex-shrink: 0;
    font-size: 0.76rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 999px;
    color: var(--theme-primary-dark);
    background: var(--theme-primary-bg);
    border: 1px solid var(--theme-primary-border);
}

.step-role-s {
    color: var(--theme-accent);
    background: var(--theme-accent-bg);
    border-color: var(--theme-accent-border);
}

/* ============ 合作与招贤 ============ */
.join-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    max-width: 1000px;
    margin: 0 auto;
}

.join-col {
    padding: 26px 24px 28px;
    border-radius: 14px;
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
}

.join-col-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.05rem;
    font-weight: 800;
    color: var(--color-text-primary);
    margin: 0 0 16px;
}

.join-col-title i {
    color: var(--theme-primary);
    font-size: 1.15rem;
}

.join-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.join-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    line-height: 1.55;
    color: var(--color-text-secondary);
}

.join-list i {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--theme-primary);
    font-size: 1rem;
    line-height: 1;
}

.join-contact {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
    max-width: 1000px;
    margin: 22px auto 0;
    padding: 18px 24px;
    border-radius: 14px;
    background: var(--theme-primary-bg);
    border: 1px solid var(--theme-primary-border);
    font-size: 0.92rem;
    color: var(--color-text-secondary);
}

.join-contact > i {
    color: var(--theme-primary);
}

.join-sep {
    color: var(--color-border);
}

/* ============ 尾部 CTA ============ */
.lp-cta {
    padding: 88px 0;
    background: linear-gradient(160deg, #0f172a 0%, #16233d 55%, #12203a 100%);
    position: relative;
    overflow: hidden;
}

.lp-cta::before {
    content: "";
    position: absolute;
    width: 520px;
    height: 520px;
    right: -180px;
    top: -160px;
    background: radial-gradient(circle, rgba(var(--theme-primary-rgb), 0.22), transparent 68%);
    pointer-events: none;
}

.cta-box {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 760px;
    margin: 0 auto;
}

.cta-title {
    font-size: clamp(1.6rem, 3.2vw, 2.4rem);
    font-weight: 800;
    color: #f1f5f9;
    letter-spacing: -0.5px;
    margin: 0 0 14px;
    line-height: 1.3;
}

.cta-desc {
    font-size: 1rem;
    color: rgba(226, 232, 240, 0.72);
    line-height: 1.85;
    margin: 0 auto 30px;
    max-width: 560px;
}

.cta-actions {
    display: inline-flex;
    gap: 14px;
    flex-wrap: wrap;
    justify-content: center;
}

/* ============ 页脚 ============ */
.lp-footer {
    padding: 56px 0 28px;
    background: var(--color-bg-surface);
    border-top: 1px solid var(--color-border-muted);
}

.lp-footer-grid {
    display: grid;
    grid-template-columns: 1.6fr repeat(3, 1fr);
    gap: 32px;
    padding-bottom: 32px;
}

.lp-footer .lp-logo {
    color: var(--color-text-primary);
}

.lp-footer-mission {
    margin: 14px 0 16px;
    font-size: 0.88rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
    max-width: 340px;
}

.lp-footer-social {
    display: flex;
    gap: 10px;
}

.lp-footer-social a {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-muted);
    border: 1px solid var(--color-border-muted);
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color .2s ease, border-color .2s ease;
}

.lp-footer-social a:hover {
    color: var(--theme-primary);
    border-color: var(--theme-primary-border);
}

.lp-footer-col h4 {
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin: 0 0 14px;
}

.lp-footer-col a {
    display: block;
    font-size: 0.87rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    padding: 5px 0;
    transition: color .2s ease;
}

.lp-footer-col a:hover {
    color: var(--theme-primary);
}

.lp-footer-bottom {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
    padding-top: 22px;
    border-top: 1px solid var(--color-border-muted);
    font-size: 0.82rem;
    color: var(--color-text-muted);
}

/* 底部法务链接：以前是纯文本，现在指向真实页面 */
.lp-footer-links {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.lp-footer-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color .2s ease;
}

.lp-footer-links a:hover {
    color: var(--theme-primary);
    text-decoration: underline;
}

.lp-link-sep {
    opacity: .45;
}

/* ============ 法务文档（隐私政策 / 用户协议） ============ */
.lp-doc {
    max-width: 860px;
    margin: 0 auto;
    padding: 26px 28px 30px;
    border: 1px solid var(--color-border-muted, rgba(148, 163, 184, .28));
    border-radius: 16px;
    background: var(--color-bg-surface, #ffffff);
    line-height: 1.9;
    font-size: .95rem;
    color: var(--color-text-secondary, #475569);
}

.lp-doc h2 {
    margin: 30px 0 10px;
    font-size: 1.12rem;
    font-weight: 700;
    color: var(--color-text-primary, #0f172a);
}

.lp-doc h2:first-child {
    margin-top: 0;
}

.lp-doc p {
    margin: 0 0 10px;
}

.lp-doc ul {
    margin: 0 0 12px;
    padding-left: 20px;
}

.lp-doc li {
    margin-bottom: 6px;
}

.lp-doc strong {
    color: var(--color-text-primary, #0f172a);
}

.lp-doc-meta {
    max-width: 860px;
    margin: 18px auto 0;
    font-size: .82rem;
    color: var(--color-text-muted, #94a3b8);
}

/* 深色模式：法务文档卡片应是不透明深色表面，避免半透明白色发灰 */
[data-mode="dark"] .lp-doc {
    background: var(--color-bg-surface, #0f172a);
    border-color: rgba(148, 163, 184, .18);
}

/* ============ 滚动淡入 ============ */
.reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity .6s ease, transform .6s ease;
}

.reveal.is-visible {
    opacity: 1;
    transform: none;
}

/* ============ 动画 ============ */
@keyframes lp-pulse {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: .45;
        transform: scale(.86);
    }
}

/* ============ 响应式：平板 ============ */
@media (max-width: 991px) {
    .lp-section {
        padding: 64px 0;
    }

    .lp-head {
        margin-bottom: 36px;
    }

    .hero-core {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }

    .hero-text {
        text-align: center;
    }

    .hero-desc {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-visual {
        justify-content: center;
    }

    .hero-stack {
        max-width: 520px;
        margin: 0 auto;
    }

    .bento {
        grid-template-columns: repeat(2, 1fr);
    }

    .bento-cell--lead {
        grid-column: span 2;
        grid-row: span 1;
    }

    .bento-cell--wide {
        grid-column: span 2;
    }

    .steps {
        grid-template-columns: repeat(2, 1fr);
    }

    .join-grid {
        grid-template-columns: 1fr;
    }

    .lp-footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ============ 响应式：手机 ============ */
@media (max-width: 767px) {
    .hero {
        padding: 96px 0 100px;
    }

    .lp-nav-toggle {
        display: inline-flex;
    }

    .lp-nav-menu {
        position: absolute;
        top: 100%;
        left: 12px;
        right: 12px;
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
        padding: 10px;
        border-radius: 14px;
        background: rgba(15, 23, 42, 0.96);
        backdrop-filter: blur(16px);
        border: 1px solid rgba(255, 255, 255, 0.1);
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
        opacity: 0;
        transform: translateY(-10px);
        pointer-events: none;
        transition: opacity .22s ease, transform .22s ease;
    }

    .lp-nav-menu.open {
        opacity: 1;
        transform: translateY(0);
        pointer-events: auto;
    }

    .lp-nav.scrolled .lp-nav-menu {
        background: rgba(255, 255, 255, 0.96);
        border-color: var(--color-border);
    }

    .lp-nav-menu > a {
        justify-content: center;
        color: rgba(226, 232, 240, 0.9);
    }

    .lp-nav.scrolled .lp-nav-menu > a {
        color: var(--color-text-primary);
    }

    .lp-nav-cta {
        margin-left: 0;
    }

    /* 窄屏去掉标题第二行的错位缩进，避免折行后参差不齐 */
    .hero-title-accent {
        padding-left: 0;
    }

    .btn-hero-primary,
    .btn-hero-ghost,
    .btn-lp-primary {
        justify-content: center;
    }

    .bento {
        grid-template-columns: 1fr;
    }

    .bento-cell--lead,
    .bento-cell--wide {
        grid-column: span 1;
    }

    .bento-mini {
        grid-template-columns: 1fr;
    }

    .steps {
        grid-template-columns: 1fr;
    }

    .hero-stack {
        max-width: 340px;
        margin: 0 auto;
    }

    .hero-stats {
        justify-content: center;
        gap: 10px;
    }

    .hero-stat {
        padding: 6px 10px;
    }

    .hero-stat > i {
        font-size: 0.95rem;
    }

    .hero-stat-num {
        font-size: 1.1rem;
    }

    .lp-footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .join-contact {
        flex-direction: column;
        text-align: center;
    }
}

/* ============ 无障碍：降低动效 ============ */
@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }

    .hero-vision-dot {
        animation: none;
    }

    .bento-cell:hover {
        transform: none;
    }
}

/* ============ 站点首页：隐藏滚动条（页面仍可滚动） ============
 * 关键点：页面滚动条归「根元素 html（viewport）」所有，只写 body 的伪元素不生效，
 * 因此必须同时命中 html（由 index.html 内联脚本加的 .lp-page 标记）与 body.landing-body。
 * 仅仅不显示滚动条的外观：鼠标滚轮 / 触控板 / 键盘 / 锚点跳转全部照常可用。
 * 作用域仅限站点首页（index.html），课程页、后台页等不受影响。
 */
html.lp-page,
body.landing-body {
    scrollbar-width: none;
    /* Firefox */
    -ms-overflow-style: none;
    /* 旧版 Edge / IE */
}

html.lp-page::-webkit-scrollbar,
html.lp-page::-webkit-scrollbar-thumb,
html.lp-page::-webkit-scrollbar-track,
body.landing-body::-webkit-scrollbar,
body.landing-body::-webkit-scrollbar-thumb,
body.landing-body::-webkit-scrollbar-track {
    width: 0;
    height: 0;
    display: none;
    /* Chrome / Safari / Edge(Chromium) */
    background: transparent;
}