/* ==========================================================================
   www.k8s2024.com 首页模板样式（模板编码：simple）
   视觉体系：沿用站点原主题（Arco 蓝白体系）的品牌色阶与中性色阶
   执行原则：白底 + 蓝色强调 + 卡片分层；不使用玻璃拟态、彩色发光、
             跨色相渐变、粒子与装饰插画；层次靠描边、留白与字号字重建立。
   静态资源目录：/public/assets/plugin/simple/css/
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 设计 token
   -------------------------------------------------------------------------- */
:root {
    /* 品牌色阶（原主题 arcoblue 原值） */
    --brand-1: #E8F3FF;
    --brand-2: #BEDAFF;
    --brand-3: #94BFFF;
    --brand-4: #6AA1FF;
    --brand-5: #4080FF;
    --brand-6: #165DFF;
    --brand-7: #0E42D2;
    --brand-8: #072CA6;
    --brand-9: #031A79;
    --brand-10: #000D4D;

    /* 中性色阶（原主题 gray 原值） */
    --gray-1: #F7F8FA;
    --gray-2: #F2F3F5;
    --gray-3: #E5E6EB;
    --gray-4: #C9CDD4;
    --gray-5: #A9AEB8;
    --gray-6: #86909C;
    --gray-7: #6B7785;
    --gray-8: #4E5969;
    --gray-9: #272E3B;
    --gray-10: #1D2129;

    --white: #FFFFFF;

    /* 功能色（仅状态使用） */
    --success-6: #00B42A;
    --danger-6: #F53F3F;

    /* 语义 */
    --text-title: var(--gray-10);
    --text-body: var(--gray-8);
    --text-muted: var(--gray-7);
    --text-faint: var(--gray-6);

    --line: var(--gray-3);
    --line-strong: var(--gray-4);
    --line-soft: var(--gray-2);

    --surface: var(--white);
    --surface-sub: var(--gray-1);
    --surface-inset: var(--gray-2);

    /* 阴影：只用中性投影，无彩色发光 */
    --shadow-1: 0 1px 2px rgba(29, 33, 41, .05);
    --shadow-2: 0 2px 6px rgba(29, 33, 41, .06), 0 1px 2px rgba(29, 33, 41, .04);
    --shadow-3: 0 10px 24px rgba(29, 33, 41, .08), 0 2px 6px rgba(29, 33, 41, .04);
    --shadow-4: 0 18px 40px rgba(29, 33, 41, .10);

    /* 圆角：按层级区分，不统一一种圆角 */
    --r-xs: 4px;
    --r-sm: 8px;
    --r-md: 12px;
    --r-lg: 14px;
    --r-xl: 18px;
    --r-2xl: 22px;
    --r-pill: 999px;

    /* 尺寸与节奏 */
    --container: 1200px;
    --gutter: 24px;
    --header-h: 72px;
    --space-section: 112px;
    --space-card: 30px;

    /* 动效 */
    --ease: cubic-bezier(.22, .8, .36, 1);
    --dur-1: 150ms;
    --dur-2: 220ms;
    --dur-3: 320ms;
    --dur-reveal: 560ms;

    --font-sans: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

/* --------------------------------------------------------------------------
   2. 基础
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--text-body);
    font: 400 15px/1.7 var(--font-sans);
    background: var(--surface);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
}

img,
video {
    display: block;
    max-width: 100%;
}

h1,
h2,
h3,
h4,
p,
dl,
dd,
dt,
figure {
    margin: 0;
}

ul,
ol {
    margin: 0;
    padding: 0;
    list-style: none;
}

button {
    font-family: inherit;
}

em,
i {
    font-style: normal;
}

.num {
    font-variant-numeric: tabular-nums;
    font-feature-settings: "tnum" 1;
}

:focus-visible {
    outline: 2px solid var(--brand-6);
    outline-offset: 2px;
    border-radius: var(--r-xs);
}

::selection {
    background: var(--brand-2);
    color: var(--gray-10);
}

.container {
    width: min(var(--container), 100% - var(--gutter) * 2);
    margin-inline: auto;
}

.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    z-index: 200;
    padding: 10px 16px;
    border-radius: 0 0 var(--r-sm) 0;
    color: #fff;
    font-size: 13px;
    font-weight: 600;
    background: var(--brand-6);
}

.skip-link:focus {
    left: 0;
}

/* --------------------------------------------------------------------------
   3. 排版
   -------------------------------------------------------------------------- */
.eyebrow,
.kicker {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 22px;
    padding: 7px 15px;
    border: 1px solid var(--brand-2);
    border-radius: var(--r-pill);
    color: var(--brand-7);
    font-size: 12.5px;
    font-weight: 600;
    letter-spacing: .1em;
    text-transform: uppercase;
    background: var(--brand-1);
}

.eyebrow::before,
.kicker::before {
    content: "";
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--brand-6);
}

.section-title {
    color: var(--text-title);
    font-size: clamp(24px, 2.9vw, 36px);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -.01em;
}

.section-subtitle {
    margin-top: 14px;
    color: var(--text-muted);
    font-size: 15px;
}

.section-text {
    margin: 0 0 28px;
    color: var(--text-body);
}

.section-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 28px;
    margin-bottom: 48px;
}

.section-head-main {
    max-width: 640px;
}

.section-more {
    flex: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding-bottom: 2px;
    color: var(--brand-6);
    font-size: 14px;
    font-weight: 600;
    border-bottom: 1px solid transparent;
    transition: color var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease);
}

.section-more::after {
    content: "→";
    transition: transform var(--dur-2) var(--ease);
}

.section-more:hover {
    color: var(--brand-7);
    border-bottom-color: var(--brand-3);
}

.section-more:hover::after {
    transform: translateX(3px);
}

/* --------------------------------------------------------------------------
   4. 按钮
   -------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 44px;
    padding: 0 22px;
    border: 1px solid transparent;
    border-radius: var(--r-sm);
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    letter-spacing: .01em;
    white-space: nowrap;
    cursor: pointer;
    background: var(--brand-6);
    transition: background var(--dur-2) var(--ease), color var(--dur-2) var(--ease),
        border-color var(--dur-2) var(--ease), box-shadow var(--dur-2) var(--ease),
        transform var(--dur-1) var(--ease);
}

.btn-lg {
    height: 52px;
    padding: 0 30px;
    border-radius: var(--r-md);
    font-size: 15.5px;
}

.btn-primary {
    box-shadow: var(--shadow-1);
}

.btn-primary:hover {
    background: var(--brand-5);
    transform: translateY(-2px);
    box-shadow: var(--shadow-2);
}

.btn-primary:active {
    background: var(--brand-7);
    transform: translateY(0);
    box-shadow: none;
}

.btn-ghost {
    color: var(--text-title);
    background: var(--surface);
    border-color: var(--line-strong);
    box-shadow: var(--shadow-1);
}

.btn-ghost:hover {
    color: var(--brand-6);
    border-color: var(--brand-3);
    background: var(--brand-1);
    transform: translateY(-2px);
}

.btn-ghost:active {
    transform: translateY(0);
    box-shadow: none;
}

.btn-sm {
    height: 38px;
    padding: 0 16px;
    border-radius: var(--r-sm);
    font-size: 13.5px;
}

.btn[disabled],
.btn.is-disabled {
    cursor: not-allowed;
    opacity: .45;
    transform: none;
    box-shadow: none;
}

/* --------------------------------------------------------------------------
   5. 卡片
   -------------------------------------------------------------------------- */
.card {
    position: relative;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-lg);
    box-shadow: var(--shadow-1);
    transition: transform var(--dur-3) var(--ease), border-color var(--dur-2) var(--ease),
        box-shadow var(--dur-3) var(--ease);
}

.card:hover {
    transform: translateY(-3px);
    border-color: var(--brand-3);
    box-shadow: var(--shadow-3);
}

/* --------------------------------------------------------------------------
   6. 顶部导航
   -------------------------------------------------------------------------- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 60;
    background: var(--surface);
    border-bottom: 1px solid transparent;
    transition: border-color var(--dur-3) var(--ease), box-shadow var(--dur-3) var(--ease);
}

.site-header.is-scrolled {
    border-bottom-color: var(--line);
    box-shadow: 0 4px 16px rgba(29, 33, 41, .05);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    height: var(--header-h);
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 11px;
    color: var(--text-title);
    font-size: 18px;
    font-weight: 700;
    letter-spacing: .01em;
    white-space: nowrap;
}

.logo img {
    height: 32px;
    width: auto;
}

.logo-mark {
    display: grid;
    place-items: center;
    width: 34px;
    height: 34px;
    border-radius: var(--r-sm);
    color: #fff;
    font-size: 13px;
    font-weight: 700;
    background: var(--brand-6);
}

.logo-text {
    font-size: 17px;
}

.main-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 30px;
    flex: 1;
}

.nav-link {
    position: relative;
    padding: 6px 0;
    color: var(--text-body);
    font-size: 14.5px;
    transition: color var(--dur-2) var(--ease);
}

.nav-link::after {
    content: "";
    position: absolute;
    left: 0;
    right: 100%;
    bottom: 0;
    height: 2px;
    border-radius: 2px;
    background: var(--brand-6);
    transition: right var(--dur-2) var(--ease);
}

.nav-link:hover,
.nav-link.is-active {
    color: var(--text-title);
}

.nav-link:hover::after,
.nav-link.is-active::after {
    right: 0;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.menu-toggle {
    display: none;
    position: relative;
    width: 42px;
    height: 42px;
    padding: 0;
    border: 1px solid var(--line-strong);
    border-radius: var(--r-sm);
    background: var(--surface);
    cursor: pointer;
    transition: border-color var(--dur-2) var(--ease), background var(--dur-2) var(--ease);
}

.menu-toggle:hover {
    border-color: var(--brand-3);
    background: var(--brand-1);
}

.menu-toggle span,
.menu-toggle span::before,
.menu-toggle span::after {
    content: "";
    position: absolute;
    left: 50%;
    width: 18px;
    height: 2px;
    border-radius: 2px;
    background: var(--text-title);
    transform: translateX(-50%);
    transition: transform var(--dur-2) var(--ease), opacity var(--dur-2) var(--ease);
}

.menu-toggle span {
    top: 20px;
}

.menu-toggle span::before {
    top: -6px;
}

.menu-toggle span::after {
    top: 6px;
}

.menu-toggle[aria-expanded="true"] span {
    background: transparent;
}

.menu-toggle[aria-expanded="true"] span::before {
    top: 0;
    transform: translateX(-50%) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span::after {
    top: 0;
    transform: translateX(-50%) rotate(-45deg);
}

.mobile-menu {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    z-index: 59;
    padding: 8px 24px 22px;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-3);
}

.mobile-menu[hidden] {
    display: none;
}

.mobile-menu a {
    display: block;
    padding: 14px 2px;
    color: var(--text-body);
    font-size: 15.5px;
    border-bottom: 1px solid var(--line-soft);
    transition: color var(--dur-2) var(--ease), padding-left var(--dur-2) var(--ease);
}

.mobile-menu a:hover {
    color: var(--brand-6);
    padding-left: 6px;
}

.mobile-menu .btn {
    width: 100%;
    margin-top: 18px;
    border-bottom: 0;
}

.mobile-menu .btn:hover {
    padding-left: 22px;
}

@media (min-width: 901px) {
    .mobile-menu {
        display: none;
    }
}

/* --------------------------------------------------------------------------
   7. 首屏：全屏视频幻灯片
   -------------------------------------------------------------------------- */
.hero {
    position: relative;
    display: flex;
    align-items: center;
    min-height: 100vh;
    min-height: 100svh;
    padding: calc(var(--header-h) + 48px) 0 80px;
    overflow: hidden;
    background: var(--brand-1);
}

.hero-stage {
    position: absolute;
    inset: 0;
    z-index: 0;
    overflow: hidden;
}

.hero-video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    opacity: 0;
    transform: translateZ(0);
    transition: opacity 1000ms var(--ease);
}

.hero-video.is-active {
    opacity: 1;
}

/* 功能性遮罩：左侧更白保证正文可读，右侧保留画面细节 */
.hero-mask {
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    background:
        linear-gradient(90deg, rgba(255, 255, 255, .95) 0%, rgba(255, 255, 255, .90) 34%, rgba(255, 255, 255, .66) 60%, rgba(255, 255, 255, .34) 84%, rgba(255, 255, 255, .22) 100%),
        linear-gradient(180deg, rgba(255, 255, 255, .58) 0%, rgba(255, 255, 255, .04) 30%, rgba(255, 255, 255, .04) 68%, rgba(255, 255, 255, .64) 100%);
}

.hero-inner {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.hero-title {
    max-width: 15em;
    margin-bottom: 20px;
    color: var(--text-title);
    font-size: clamp(32px, 4.4vw, 54px);
    font-weight: 800;
    line-height: 1.14;
    letter-spacing: -.015em;
}

.hero-desc {
    max-width: 34em;
    margin-bottom: 32px;
    color: var(--text-body);
    font-size: 16.5px;
    line-height: 1.72;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
}

.hero-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 34px;
}

.hero-stat {
    min-width: 152px;
    padding: 15px 20px;
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    background: var(--surface);
    box-shadow: var(--shadow-2);
}

.hero-stat-value {
    display: block;
    color: var(--text-title);
    font-size: 25px;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -.02em;
}

.hero-stat-label {
    display: block;
    margin-top: 3px;
    color: var(--text-faint);
    font-size: 12.5px;
}

/* 幻灯片控制区 */
.hero-controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 16px;
    width: 100%;
    max-width: 620px;
    margin-top: 44px;
    padding-top: 24px;
    border-top: 1px solid rgba(29, 33, 41, .12);
}

.hero-stepper {
    display: flex;
    gap: 8px;
}

.ctrl-btn {
    display: grid;
    place-items: center;
    width: 44px;
    height: 44px;
    padding: 0;
    color: var(--text-body);
    background: var(--surface);
    border: 1px solid var(--line-strong);
    border-radius: var(--r-sm);
    cursor: pointer;
    transition: color var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease),
        background var(--dur-2) var(--ease), transform var(--dur-1) var(--ease);
}

.ctrl-btn svg {
    width: 18px;
    height: 18px;
}

.ctrl-btn:hover {
    color: var(--brand-6);
    border-color: var(--brand-3);
    background: var(--brand-1);
}

.ctrl-btn:active {
    transform: translateY(1px);
    background: var(--brand-2);
}

.ctrl-btn-sm {
    width: 38px;
    height: 38px;
}

.ctrl-btn .icon-play {
    display: none;
}

.ctrl-btn.is-paused .icon-pause {
    display: none;
}

.ctrl-btn.is-paused .icon-play {
    display: block;
}

.hero-indicators {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1 1 150px;
    max-width: 240px;
}

.hero-indicator {
    position: relative;
    flex: 1;
    height: 3px;
    padding: 0;
    border: 0;
    border-radius: 2px;
    background: rgba(29, 33, 41, .14);
    cursor: pointer;
    overflow: hidden;
    transition: background var(--dur-2) var(--ease);
}

.hero-indicator:hover {
    background: rgba(29, 33, 41, .26);
}

.hero-indicator-fill {
    display: block;
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: var(--brand-6);
}

.hero-meter {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-left: auto;
}

.hero-count {
    color: var(--text-faint);
    font-size: 13px;
    letter-spacing: .06em;
}

.hero-count b {
    color: var(--text-title);
    font-weight: 700;
}

.hero-count i {
    margin: 0 3px;
    color: var(--line-strong);
}

/* --------------------------------------------------------------------------
   8. 区块
   -------------------------------------------------------------------------- */
.section {
    padding: var(--space-section) 0;
}

.section-alt {
    background: var(--surface-sub);
    border-top: 1px solid var(--line-soft);
    border-bottom: 1px solid var(--line-soft);
}

/* --------------------------------------------------------------------------
   9. 核心能力（6 列错落栅格 + 展开收起）
   -------------------------------------------------------------------------- */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 20px;
    /* 内边距 + 负外边距：让 overflow:hidden 不裁掉卡片 hover 位移与投影 */
    padding: 6px;
    margin: -6px;
    overflow: hidden;
}

.feature-grid.is-collapsed > .feature-card:nth-child(n + 5) {
    display: none;
}

.feature-card {
    position: relative;
    display: flex;
    flex-direction: column;
    grid-column: span 3;
    padding: var(--space-card);
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-lg);
    box-shadow: var(--shadow-1);
    transition: transform var(--dur-3) var(--ease), border-color var(--dur-2) var(--ease),
        box-shadow var(--dur-3) var(--ease);
}

.feature-card:hover {
    transform: translateY(-3px);
    border-color: var(--brand-3);
    box-shadow: var(--shadow-3);
}

.feature-grid .feature-card:nth-child(1) {
    grid-column: span 4;
    border-color: var(--brand-6);
    border-radius: var(--r-xl);
    background: var(--brand-6);
    box-shadow: var(--shadow-2);
}

.feature-grid .feature-card:nth-child(1):hover {
    border-color: var(--brand-5);
    background: var(--brand-5);
}

.feature-grid .feature-card:nth-child(2) {
    grid-column: span 2;
}

.feature-grid .feature-card:nth-child(3) {
    grid-column: span 2;
}

.feature-grid .feature-card:nth-child(4) {
    grid-column: span 4;
}

.feature-grid .feature-card:nth-child(n + 5) {
    grid-column: span 3;
}

.feature-icon {
    display: grid;
    place-items: center;
    width: 44px;
    height: 44px;
    margin-bottom: 22px;
    border-radius: var(--r-md);
    color: var(--brand-6);
    background: var(--brand-1);
}

.feature-icon svg {
    width: 22px;
    height: 22px;
}

.feature-title {
    margin-bottom: 10px;
    color: var(--text-title);
    font-size: 17px;
    font-weight: 700;
}

.feature-desc {
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.72;
}

.feature-card:nth-child(1) .feature-icon {
    color: #fff;
    background: rgba(255, 255, 255, .18);
}

.feature-card:nth-child(1) .feature-title {
    color: #fff;
    font-size: 22px;
}

.feature-card:nth-child(1) .feature-desc {
    max-width: 36em;
    color: rgba(255, 255, 255, .84);
    font-size: 14.5px;
}

/* 展开/收起 */
.collapse-actions {
    display: flex;
    justify-content: center;
    margin-top: 32px;
}

.collapse-actions[hidden] {
    display: none;
}

.collapse-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.collapse-toggle::after {
    content: "";
    width: 7px;
    height: 7px;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: translateY(-2px) rotate(45deg);
    transition: transform var(--dur-2) var(--ease);
}

.collapse-toggle[aria-expanded="true"]::after {
    transform: translateY(1px) rotate(-135deg);
}

/* --------------------------------------------------------------------------
   10. 数据指标
   -------------------------------------------------------------------------- */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 20px;
}

.stat-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 28px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-lg);
    box-shadow: var(--shadow-1);
    transition: transform var(--dur-3) var(--ease), border-color var(--dur-2) var(--ease),
        box-shadow var(--dur-3) var(--ease);
}

.stat-item:hover {
    transform: translateY(-3px);
    border-color: var(--brand-3);
    box-shadow: var(--shadow-3);
}

.stat-icon {
    flex: none;
    display: grid;
    place-items: center;
    width: 46px;
    height: 46px;
    border-radius: var(--r-md);
    color: var(--brand-6);
    background: var(--brand-1);
}

.stat-icon svg {
    width: 23px;
    height: 23px;
}

.stat-body {
    min-width: 0;
}

.stat-value {
    display: block;
    color: var(--text-title);
    font-size: 30px;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -.02em;
}

.stat-label {
    display: block;
    margin-top: 6px;
    color: var(--text-faint);
    font-size: 13px;
}

/* --------------------------------------------------------------------------
   11. 图文板块
   -------------------------------------------------------------------------- */
.split {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 68px;
    align-items: center;
}

.split-reverse .split-media {
    order: 2;
}

.split-body {
    min-width: 0;
}

.media-card {
    padding: 10px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-2xl);
    box-shadow: var(--shadow-2);
    transition: transform var(--dur-3) var(--ease), box-shadow var(--dur-3) var(--ease),
        border-color var(--dur-2) var(--ease);
}

.media-card:hover {
    transform: translateY(-3px);
    border-color: var(--brand-3);
    box-shadow: var(--shadow-3);
}

.media-card video {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    border-radius: var(--r-lg);
    background: var(--gray-9);
}

.spec-list {
    display: grid;
    gap: 16px;
    margin: 0 0 30px;
    padding: 26px 0 0;
    border-top: 1px solid var(--line);
}

.spec-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.spec-icon {
    flex: none;
    display: grid;
    place-items: center;
    width: 34px;
    height: 34px;
    border-radius: var(--r-sm);
    color: var(--brand-6);
    background: var(--brand-1);
}

.spec-icon svg {
    width: 18px;
    height: 18px;
}

.spec-body {
    display: flex;
    align-items: baseline;
    gap: 10px;
}

.spec-label {
    color: var(--text-faint);
    font-size: 12.5px;
}

.spec-value {
    color: var(--text-title);
    font-size: 15px;
    font-weight: 600;
}

/* --------------------------------------------------------------------------
   12. 动态列表（+ 展开收起）
   -------------------------------------------------------------------------- */
.notice-list {
    display: grid;
    gap: 12px;
    padding: 4px;
    margin: -4px;
    overflow: hidden;
}

.notice-list.is-collapsed > .notice-row:nth-child(n + 5) {
    display: none;
}

.notice-row {
    display: grid;
    grid-template-columns: 58px minmax(0, 1fr) 20px;
    align-items: center;
    gap: 20px;
    padding: 18px 22px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    box-shadow: var(--shadow-1);
    transition: transform var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease),
        box-shadow var(--dur-2) var(--ease);
}

.notice-row:hover {
    transform: translateX(4px);
    border-color: var(--brand-3);
    box-shadow: var(--shadow-2);
}

.notice-date {
    display: grid;
    place-items: center;
    width: 58px;
    height: 58px;
    border-radius: var(--r-sm);
    background: var(--brand-1);
    line-height: 1.15;
}

.notice-day {
    color: var(--brand-6);
    font-size: 21px;
    font-weight: 800;
}

.notice-month {
    color: var(--text-faint);
    font-size: 11px;
}

.notice-body {
    min-width: 0;
}

.notice-title {
    display: block;
    color: var(--text-title);
    font-size: 16px;
    font-weight: 600;
    transition: color var(--dur-2) var(--ease);
}

.notice-row:hover .notice-title {
    color: var(--brand-6);
}

.notice-desc {
    display: block;
    margin-top: 5px;
    overflow: hidden;
    color: var(--text-muted);
    font-size: 13.5px;
    white-space: nowrap;
    text-overflow: ellipsis;
}

.notice-arrow {
    width: 20px;
    height: 20px;
    color: var(--gray-5);
    transition: transform var(--dur-2) var(--ease), color var(--dur-2) var(--ease);
}

.notice-row:hover .notice-arrow {
    color: var(--brand-6);
    transform: translateX(3px);
}

.empty-tip {
    padding: 44px 24px;
    color: var(--text-muted);
    font-size: 14px;
    text-align: center;
    background: var(--surface-inset);
    border: 1px dashed var(--line-strong);
    border-radius: var(--r-md);
}

/* --------------------------------------------------------------------------
   13. 内页
   -------------------------------------------------------------------------- */
.page-hero {
    padding: calc(var(--header-h) + 64px) 0 48px;
    background: var(--brand-1);
    border-bottom: 1px solid var(--brand-2);
}

.page-inner .section {
    padding-top: 68px;
}

/* --------------------------------------------------------------------------
   14. 表单
   -------------------------------------------------------------------------- */
.form-control {
    display: block;
    width: 100%;
    min-height: 44px;
    padding: 10px 14px;
    color: var(--text-title);
    font: 400 15px/1.6 var(--font-sans);
    background: var(--surface);
    border: 1px solid var(--line-strong);
    border-radius: var(--r-sm);
    transition: border-color var(--dur-2) var(--ease), box-shadow var(--dur-2) var(--ease);
}

.form-control::placeholder {
    color: var(--gray-5);
}

.form-control:hover {
    border-color: var(--brand-3);
}

.form-control:focus {
    outline: none;
    border-color: var(--brand-6);
    box-shadow: 0 0 0 3px rgba(22, 93, 255, .12);
}

.form-control[disabled],
.form-control[readonly] {
    color: var(--text-faint);
    background: var(--surface-inset);
    cursor: not-allowed;
}

/* --------------------------------------------------------------------------
   15. 页脚
   -------------------------------------------------------------------------- */
.site-footer {
    padding: 64px 0 28px;
    background: var(--surface-sub);
    border-top: 1px solid var(--line);
}

.footer-grid {
    display: grid;
    grid-template-columns: minmax(0, 2fr) minmax(0, 1fr) minmax(0, 1.2fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-desc {
    max-width: 34em;
    color: var(--text-muted);
    font-size: 13.5px;
}

.footer-nav-title {
    display: block;
    margin-bottom: 18px;
    color: var(--text-title);
    font-size: 14px;
    font-weight: 700;
}

.footer-nav a {
    display: block;
    margin-bottom: 12px;
    color: var(--text-muted);
    font-size: 13.5px;
    transition: color var(--dur-2) var(--ease), padding-left var(--dur-2) var(--ease);
}

.footer-nav a:hover {
    color: var(--brand-6);
    padding-left: 4px;
}

.footer-contact p {
    margin-bottom: 12px;
    color: var(--text-muted);
    font-size: 13.5px;
}

.footer-bottom {
    border-top: 1px solid var(--line);
}

.footer-bottom-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding-top: 24px;
    color: var(--text-faint);
    font-size: 12.5px;
}

/* --------------------------------------------------------------------------
   16. 回到顶部
   -------------------------------------------------------------------------- */
.back-top {
    position: fixed;
    right: 24px;
    bottom: 24px;
    z-index: 55;
    display: grid;
    place-items: center;
    width: 46px;
    height: 46px;
    padding: 0;
    color: var(--text-body);
    background: var(--surface);
    border: 1px solid var(--line-strong);
    border-radius: var(--r-sm);
    box-shadow: var(--shadow-2);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: opacity var(--dur-2) var(--ease), visibility var(--dur-2) var(--ease),
        transform var(--dur-2) var(--ease), color var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease);
}

.back-top svg {
    width: 20px;
    height: 20px;
}

.back-top.is-show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-top:hover {
    color: var(--brand-6);
    border-color: var(--brand-3);
    transform: translateY(-2px);
}

.back-top:active {
    transform: translateY(0);
}

/* --------------------------------------------------------------------------
   17. 入场与内容切换动效（均由 JS 添加；无 JS 时内容照常显示）
   -------------------------------------------------------------------------- */
.reveal-item {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity var(--dur-reveal) var(--ease), transform var(--dur-reveal) var(--ease);
}

.reveal-item.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* --------------------------------------------------------------------------
   18. 响应式
   -------------------------------------------------------------------------- */
@media (max-width: 1080px) {
    :root {
        --space-section: 88px;
    }

    .hero {
        padding: calc(var(--header-h) + 36px) 0 64px;
    }

    .feature-grid .feature-card,
    .feature-grid .feature-card:nth-child(1),
    .feature-grid .feature-card:nth-child(2),
    .feature-grid .feature-card:nth-child(3),
    .feature-grid .feature-card:nth-child(4),
    .feature-grid .feature-card:nth-child(n + 5) {
        grid-column: span 3;
    }

    .split {
        gap: 46px;
    }

    .footer-grid {
        grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    }
}

@media (max-width: 900px) {
    .main-nav,
    .header-actions {
        display: none;
    }

    .menu-toggle {
        display: block;
    }

    .split {
        grid-template-columns: minmax(0, 1fr);
        gap: 34px;
    }

    .split-reverse .split-media {
        order: 0;
    }

    /* 窄屏遮罩改纵向，正文压在画面中部仍可读 */
    .hero-mask {
        background:
            linear-gradient(180deg, rgba(255, 255, 255, .94) 0%, rgba(255, 255, 255, .76) 46%, rgba(255, 255, 255, .92) 100%),
            linear-gradient(180deg, rgba(255, 255, 255, .42) 0%, rgba(255, 255, 255, .16) 100%);
    }
}

@media (max-width: 767px) {
    :root {
        --space-section: 68px;
        --gutter: 18px;
        --space-card: 22px;
        --header-h: 62px;
    }

    .hero {
        padding: calc(var(--header-h) + 28px) 0 52px;
    }

    .hero-title {
        font-size: 30px;
    }

    .hero-desc {
        font-size: 15px;
        margin-bottom: 26px;
    }

    .hero-stats {
        margin-top: 26px;
    }

    .hero-stat {
        flex: 1 1 44%;
        min-width: 0;
        padding: 13px 16px;
    }

    .hero-stat-value {
        font-size: 21px;
    }

    .hero-controls {
        gap: 12px;
        margin-top: 32px;
        padding-top: 20px;
    }

    .hero-indicators {
        order: 3;
        flex: 1 1 100%;
        max-width: none;
    }

    .hero-meter {
        margin-left: auto;
    }

    .ctrl-btn {
        width: 42px;
        height: 42px;
    }

    .btn,
    .btn-lg {
        height: 46px;
        padding: 0 20px;
        font-size: 14.5px;
    }

    .hero-actions .btn {
        flex: 1 1 auto;
    }

    .feature-grid .feature-card,
    .feature-grid .feature-card:nth-child(1),
    .feature-grid .feature-card:nth-child(2),
    .feature-grid .feature-card:nth-child(3),
    .feature-grid .feature-card:nth-child(4),
    .feature-grid .feature-card:nth-child(n + 5) {
        grid-column: span 6;
    }

    .feature-card:nth-child(1) .feature-title {
        font-size: 19px;
    }

    .stat-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .stat-item {
        padding: 22px;
    }

    .notice-row {
        grid-template-columns: 50px minmax(0, 1fr) 18px;
        gap: 14px;
        padding: 15px 16px;
    }

    .notice-date {
        width: 50px;
        height: 50px;
    }

    .notice-day {
        font-size: 18px;
    }

    .footer-grid {
        grid-template-columns: minmax(0, 1fr);
        gap: 32px;
    }

    .footer-bottom-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
    }
}

/* --------------------------------------------------------------------------
   19. 减少动效
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: .001ms !important;
        transition-duration: .001ms !important;
    }

    .hero-video {
        transition: none;
    }

    .reveal-item {
        opacity: 1;
        transform: none;
    }
}