/* ============================================================
   Cangis MainSite — Dark Luxe Design System
   暗奢金：暖调近黑 + 香槟金 + 象牙白 + 衬线编辑排印
   ============================================================ */

/* ===== 基础设置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 色彩 */
    --bg: #0b0b0d;                 /* 暖调近黑背景 */
    --bg-elevated: #121318;        /* 次级背景 */
    --surface: #15161b;            /* 卡片面 */
    --surface-2: #1b1c23;          /* 卡片 hover 面 */
    --border: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.16);
    --text: #f0ece4;               /* 象牙白正文 */
    --text-2: #c9c4b8;             /* 次级文字 */
    --text-muted: #8d887c;         /* 弱化文字 */
    --gold: #d4af6a;               /* 香槟金主色 */
    --gold-bright: #eed9a6;        /* 金色高光 */
    --gold-deep: #9c7835;          /* 金色深调 */
    --gold-grad: linear-gradient(135deg, #eed9a6 0%, #d4af6a 45%, #a97e3e 100%);

    /* 字体 */
    --serif: 'Fraunces', 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
    --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    --mono: 'SF Mono', 'JetBrains Mono', 'Menlo', 'Consolas', monospace;

    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    --spacing-xxl: 8rem;

    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-pill: 999px;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    color-scheme: dark;
}

body {
    font-family: var(--sans);
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    position: relative;
    overflow-x: hidden;
}

/* 胶片颗粒质感层 */
body::after {
    content: '';
    position: fixed;
    inset: 0;
    z-index: 9998;
    pointer-events: none;
    opacity: 0.045;
    mix-blend-mode: overlay;
    background-image: url("data:image/svg+xml,%3Csvg xmlns=%27http://www.w3.org/2000/svg%27 width=%27200%27 height=%27200%27%3E%3Cfilter id=%27n%27%3E%3CfeTurbulence type=%27fractalNoise%27 baseFrequency=%270.85%27 numOctaves=%273%27 stitchTiles=%27stitch%27/%3E%3C/filter%3E%3Crect width=%27100%25%27 height=%27100%25%27 filter=%27url%28%23n%29%27/%3E%3C/svg%3E");
}

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

a, button {
    -webkit-tap-highlight-color: transparent;
}

a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--gold);
    outline-offset: 3px;
    border-radius: 4px;
}

button {
    font-family: inherit;
    cursor: pointer;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    z-index: 2;
}

@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }
}

/* ===== 通用章节 ===== */
.section {
    padding: var(--spacing-xxl) 0;
    position: relative;
}

.section-eyebrow {
    font-family: var(--mono);
    font-size: 0.8125rem;
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 1.25rem;
    display: block;
}

.section-title {
    font-family: var(--serif);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 500;
    letter-spacing: -0.01em;
    line-height: 1.15;
    margin-bottom: 1rem;
    color: var(--text);
}

.section-sub {
    font-size: 1.0625rem;
    color: var(--text-muted);
    max-width: 620px;
}

.section-head {
    margin-bottom: var(--spacing-lg);
}

/* 章节金色发丝分隔线 */
.divider {
    height: 1px;
    border: none;
    background: linear-gradient(90deg, transparent, rgba(212, 175, 106, 0.35), transparent);
}

/* 滚动淡入（仅在 JS 可用时启用，避免无 JS 时内容不可见） */
.js .reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* ===== 导航栏 ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(11, 11, 13, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: background 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

.nav.scrolled {
    background: rgba(11, 11, 13, 0.92);
    border-bottom-color: var(--border-strong);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
}

.logo {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 30px;
    width: auto;
    display: block;
}

.nav-links {
    display: flex;
    gap: 2.25rem;
    align-items: center;
}

.nav-links > a {
    font-size: 0.9375rem;
    color: var(--text-2);
    transition: color 0.3s;
    position: relative;
    font-weight: 450;
}

.nav-links > a::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--gold);
    transition: width 0.35s ease;
}

.nav-links > a:hover {
    color: var(--text);
}

.nav-links > a:hover::after {
    width: 100%;
}

/* Language Switcher */
.language-switcher {
    position: relative;
}

.language-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    color: var(--text-2);
    cursor: pointer;
    transition: all 0.3s;
    font-size: 0.875rem;
    font-family: inherit;
}

.language-btn svg:first-child {
    width: 17px;
    height: 17px;
}

.language-btn .chevron {
    width: 15px;
    height: 15px;
    transition: transform 0.3s;
}

.language-btn:hover {
    border-color: var(--gold-deep);
    color: var(--gold);
}

.language-switcher.active .language-btn {
    border-color: var(--gold-deep);
    color: var(--gold);
}

.language-switcher.active .language-btn .chevron {
    transform: rotate(180deg);
}

.language-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    min-width: 190px;
    background: rgba(18, 19, 24, 0.96);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    padding: 0.5rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s;
    z-index: 1000;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
}

.language-switcher.active .language-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.language-dropdown a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.7rem 0.9rem;
    color: var(--text-2);
    border-radius: var(--radius-sm);
    transition: all 0.25s;
    font-size: 0.875rem;
    font-weight: 400;
}

.language-dropdown a::after {
    display: none;
}

.language-dropdown a:hover {
    background: rgba(212, 175, 106, 0.1);
    color: var(--gold);
    transform: translateX(4px);
}

.language-dropdown a.active {
    background: rgba(212, 175, 106, 0.14);
    color: var(--gold);
    border-left: 2px solid var(--gold);
}

.lang-flag {
    font-size: 1.15rem;
    line-height: 1;
}

/* 移动端汉堡菜单 */
.nav-burger {
    display: none;
    width: 42px;
    height: 42px;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 62px;
    left: 0;
    right: 0;
    background: rgba(11, 11, 13, 0.97);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-strong);
    padding: 1rem 1.5rem 1.5rem;
    flex-direction: column;
    gap: 0.25rem;
    z-index: 999;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.mobile-menu.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
}

.mobile-menu a {
    padding: 0.85rem 0.5rem;
    color: var(--text-2);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    border-bottom: 1px solid var(--border);
}

.mobile-menu a:hover {
    color: var(--gold);
}

@media (max-width: 968px) {
    .nav-links > a {
        display: none;
    }
    .nav-burger {
        display: inline-flex;
    }
    .nav-container {
        padding: 0.875rem 1.5rem;
    }
}

@media (max-width: 768px) {
    .language-btn .current-lang {
        display: none;
    }
    .language-btn {
        padding: 0.5rem 0.65rem;
    }
}

/* ===== Hero 区域 ===== */
.hero {
    padding: 11rem 0 5rem;
    min-height: 92vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    opacity: 0.5;
    filter: grayscale(0.15) sepia(0.35) saturate(0.9) brightness(0.72) contrast(1.05);
    animation: hero-zoom 24s ease-in-out infinite alternate;
}

@keyframes hero-zoom {
    from { transform: scale(1); }
    to { transform: scale(1.08); }
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        100deg,
        rgba(11, 11, 13, 0.94) 0%,
        rgba(11, 11, 13, 0.72) 45%,
        rgba(11, 11, 13, 0.55) 100%
    );
}

.hero-glow {
    position: absolute;
    top: -20%;
    right: -10%;
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(212, 175, 106, 0.16) 0%, transparent 62%);
    pointer-events: none;
    z-index: 1;
}

.hero-content {
    max-width: 780px;
    position: relative;
    z-index: 2;
}

.hero-eyebrow {
    font-family: var(--mono);
    font-size: 0.8125rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 1.75rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.hero-eyebrow::before {
    content: '';
    width: 44px;
    height: 1px;
    background: var(--gold);
    opacity: 0.6;
}

.hero-title {
    font-family: var(--serif);
    font-size: clamp(2.75rem, 6vw, 4.75rem);
    font-weight: 450;
    letter-spacing: -0.015em;
    line-height: 1.08;
    margin-bottom: 1.75rem;
    color: var(--text);
    text-wrap: balance;
}

.hero-title .italic {
    font-style: italic;
    background: var(--gold-grad);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

.hero-sub {
    font-size: 1.125rem;
    color: var(--text-2);
    line-height: 1.9;
    margin-bottom: 2.75rem;
    max-width: 560px;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

/* 按钮 */
.btn {
    padding: 1rem 2.25rem;
    border-radius: var(--radius-pill);
    font-size: 0.975rem;
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease, color 0.3s ease, background 0.3s ease;
    display: inline-block;
    letter-spacing: 0.02em;
    position: relative;
}

.btn-primary {
    background: var(--gold-grad);
    color: #17130a;
    box-shadow: 0 10px 34px -10px rgba(212, 175, 106, 0.6);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 16px 44px -10px rgba(212, 175, 106, 0.85);
}

.btn-ghost {
    border: 1px solid var(--border-strong);
    color: var(--text);
    background: transparent;
}

.btn-ghost:hover {
    border-color: var(--gold);
    color: var(--gold);
    transform: translateY(-3px);
}

/* Hero 统计条 */
.hero-stats {
    display: flex;
    gap: 3.5rem;
    margin-top: 4.5rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    flex-wrap: wrap;
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.stat-num {
    font-family: var(--serif);
    font-size: 2rem;
    font-weight: 500;
    color: var(--text);
    font-variant-numeric: tabular-nums;
}

.stat-label {
    font-family: var(--mono);
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-muted);
}

@media (max-width: 768px) {
    .hero {
        padding: 9rem 0 4rem;
        min-height: auto;
    }
    .hero-title {
        font-size: clamp(2.25rem, 8vw, 3rem);
    }
    .hero-stats {
        gap: 2.5rem;
        margin-top: 3rem;
    }
    .stat-num {
        font-size: 1.6rem;
    }
}

/* ===== 走马灯条 ===== */
.marquee {
    overflow: hidden;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 1.35rem 0;
    background: var(--bg-elevated);
    position: relative;
}

.marquee-track {
    display: flex;
    gap: 3.5rem;
    width: max-content;
    animation: marquee 36s linear infinite;
    will-change: transform;
}

.marquee-item {
    display: inline-flex;
    align-items: center;
    gap: 3.5rem;
    white-space: nowrap;
    font-family: var(--serif);
    font-size: 1.05rem;
    font-style: italic;
    color: var(--text-muted);
    letter-spacing: 0.06em;
}

.marquee-item .sep {
    color: var(--gold);
    opacity: 0.65;
    font-style: normal;
}

@keyframes marquee {
    from { transform: translateX(0); }
    to { transform: translateX(-50%); }
}

/* ===== 产品区域 ===== */
.products {
    padding: var(--spacing-xxl) 0;
    background: var(--bg);
}

.product-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.product-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
    transition: transform 0.45s cubic-bezier(0.16, 1, 0.3, 1),
                border-color 0.45s ease,
                box-shadow 0.45s ease;
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gold-grad);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 3;
}

.product-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-strong);
    box-shadow: 0 24px 64px -20px rgba(0, 0, 0, 0.7);
}

.product-card:hover::before {
    transform: scaleX(1);
}

.product-image {
    position: relative;
    height: 210px;
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.product-card:hover .product-image img {
    transform: scale(1.06);
}

.product-image-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(11, 11, 13, 0.1) 0%, rgba(11, 11, 13, 0.55) 100%);
}

.product-body {
    padding: 1.75rem 1.75rem 2rem;
}

.product-header {
    display: flex;
    align-items: center;
    gap: 0.9rem;
    margin-bottom: 1rem;
}

.product-logo {
    width: 42px;
    height: 42px;
    border-radius: 10px;
    object-fit: cover;
    border: 1px solid var(--border-strong);
    background: var(--surface-2);
}

.product-logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gold);
}

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

.product-title {
    font-family: var(--serif);
    font-size: 1.6rem;
    font-weight: 500;
    color: var(--text);
}

.product-desc {
    color: var(--text-2);
    line-height: 1.8;
    margin-bottom: 1.25rem;
    font-size: 0.95rem;
}

/* 产品亮点标签 */
.product-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

.product-chip {
    font-family: var(--mono);
    font-size: 0.7rem;
    letter-spacing: 0.12em;
    color: var(--gold);
    border: 1px solid rgba(212, 175, 106, 0.35);
    border-radius: var(--radius-pill);
    padding: 0.3rem 0.8rem;
    white-space: nowrap;
}

.product-features {
    list-style: none;
    margin-bottom: 1.75rem;
}

.product-features li {
    padding: 0.55rem 0;
    color: var(--text-muted);
    position: relative;
    padding-left: 1.5rem;
    line-height: 1.65;
    font-size: 0.925rem;
}

.product-features li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--gold);
    font-size: 1rem;
}

.product-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--gold);
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: 0.04em;
    transition: gap 0.3s ease, color 0.3s ease;
}

.product-link svg {
    width: 17px;
    height: 17px;
    transition: transform 0.3s ease;
}

.product-link:hover {
    color: var(--gold-bright);
    gap: 0.85rem;
}

.product-link:hover svg {
    transform: translateX(3px);
}

/* Berise 特色通栏卡 */
.product-card--feature {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    align-items: stretch;
    background:
        radial-gradient(1200px 500px at 0% 0%, rgba(212, 175, 106, 0.08), transparent 60%),
        var(--surface);
    border-color: rgba(212, 175, 106, 0.22);
}

.product-card--feature .product-body {
    padding: 2.5rem 2.5rem 2.75rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.product-badge {
    display: inline-flex;
    align-items: center;
    align-self: flex-start;
    gap: 0.4rem;
    padding: 0.3rem 0.85rem;
    margin-bottom: 1.25rem;
    border-radius: var(--radius-pill);
    border: 1px solid rgba(212, 175, 106, 0.5);
    color: var(--gold);
    font-family: var(--mono);
    font-size: 0.7rem;
    letter-spacing: 0.24em;
    text-transform: uppercase;
}

.product-card--feature .product-title {
    font-size: 2.4rem;
    margin-bottom: 1rem;
}

.product-media {
    position: relative;
    min-height: 320px;
    border-left: 1px solid var(--border);
    overflow: hidden;
}

.product-media img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.product-card--feature:hover .product-media img {
    transform: scale(1.04);
}

@media (max-width: 968px) {
    .product-card--feature {
        grid-template-columns: 1fr;
    }
    .product-media {
        border-left: none;
        border-top: 1px solid var(--border);
        min-height: 260px;
    }
}

@media (max-width: 768px) {
    .product-list {
        grid-template-columns: 1fr;
    }
    .product-card--feature .product-title {
        font-size: 1.9rem;
    }
}

/* ===== 技术栈区域 ===== */
.tech-stack {
    padding: var(--spacing-xxl) 0;
    background: var(--bg-elevated);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
}

.tech-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 2rem 1.75rem;
    position: relative;
    overflow: hidden;
    transition: transform 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}

.tech-card::after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gold-grad);
    transform: scaleY(0);
    transform-origin: top;
    transition: transform 0.4s ease;
}

.tech-card:hover {
    transform: translateY(-5px);
    border-color: rgba(212, 175, 106, 0.35);
    box-shadow: 0 18px 48px -18px rgba(0, 0, 0, 0.65);
}

.tech-card:hover::after {
    transform: scaleY(1);
}

.tech-index {
    font-family: var(--mono);
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    color: var(--text-muted);
    display: block;
    margin-bottom: 1.25rem;
}

.tech-icon {
    width: 46px;
    height: 46px;
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    border: 1px solid var(--border);
    color: var(--text-muted);
    transition: all 0.35s ease;
}

.tech-card:hover .tech-icon {
    color: var(--gold);
    border-color: rgba(212, 175, 106, 0.4);
    box-shadow: 0 0 28px -6px rgba(212, 175, 106, 0.4);
}

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

.tech-name {
    font-family: var(--serif);
    font-size: 1.15rem;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 0.4rem;
}

.tech-desc {
    font-size: 0.875rem;
    color: var(--text-muted);
}

@media (max-width: 968px) {
    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 520px) {
    .tech-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== 特性区域 ===== */
.features {
    padding: var(--spacing-xxl) 0;
    background: var(--bg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
}

.feature-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 2rem 1.75rem;
    transition: transform 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: rgba(212, 175, 106, 0.35);
    box-shadow: 0 18px 48px -18px rgba(0, 0, 0, 0.65);
}

.feature-index {
    font-family: var(--mono);
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    color: var(--gold);
    display: block;
    margin-bottom: 1.25rem;
}

.feature-title {
    font-family: var(--serif);
    font-size: 1.3rem;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 0.9rem;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 0.4rem;
}

@media (max-width: 968px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 520px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== 案例区域 ===== */
.cases {
    padding: var(--spacing-xxl) 0;
    background: var(--bg-elevated);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.case-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    margin-bottom: 5rem;
}

.case-item:last-child {
    margin-bottom: 0;
}

.case-left .case-image { order: 1; }
.case-left .case-content { order: 2; }
.case-right .case-image { order: 2; }
.case-right .case-content { order: 1; }

.case-image {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border);
    aspect-ratio: 4 / 3;
}

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.case-image:hover img {
    transform: scale(1.05);
}

.case-image-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(11, 11, 13, 0.15) 0%, rgba(11, 11, 13, 0.6) 100%);
    pointer-events: none;
}

.case-content h3 {
    font-family: var(--serif);
    font-size: 1.9rem;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 1rem;
    text-wrap: balance;
}

.case-content > p {
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.case-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 2rem;
}

.case-stat {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.case-stat-number {
    font-family: var(--serif);
    font-size: 1.9rem;
    font-weight: 500;
    color: var(--gold);
    font-variant-numeric: tabular-nums;
}

.case-stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    letter-spacing: 0.04em;
}

.case-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--gold);
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: 0.04em;
    transition: gap 0.3s ease, color 0.3s ease;
}

.case-link svg {
    width: 17px;
    height: 17px;
    transition: transform 0.3s ease;
}

.case-link:hover {
    color: var(--gold-bright);
    gap: 0.85rem;
}

.case-link:hover svg {
    transform: translateX(3px);
}

@media (max-width: 968px) {
    .case-item {
        grid-template-columns: 1fr;
        gap: 2rem;
        margin-bottom: 3.5rem;
    }
    .case-left .case-image,
    .case-right .case-image { order: 1; }
    .case-left .case-content,
    .case-right .case-content { order: 2; }
    .case-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 1rem;
    }
    .case-stat-number {
        font-size: 1.5rem;
    }
}

/* ===== 关于区域 ===== */
.about {
    padding: var(--spacing-xxl) 0;
    background: var(--bg);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    align-items: start;
}

.about-text h2 {
    font-family: var(--serif);
    font-size: clamp(2rem, 3.5vw, 2.75rem);
    font-weight: 500;
    letter-spacing: -0.01em;
    margin-bottom: 1.5rem;
    color: var(--text);
}

.about-text p {
    color: var(--text-muted);
    line-height: 1.9;
    margin-bottom: 1rem;
}

.expertise {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.expertise-item {
    padding: 1.75rem 1.75rem 1.75rem 2.25rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: all 0.35s ease;
    position: relative;
    overflow: hidden;
}

.expertise-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--gold-grad);
    transform: scaleY(0);
    transition: transform 0.4s ease;
}

.expertise-item:hover {
    transform: translateX(6px);
    border-color: rgba(212, 175, 106, 0.35);
}

.expertise-item:hover::before {
    transform: scaleY(1);
}

.expertise-item h4 {
    font-family: var(--serif);
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--gold);
}

.expertise-item p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

@media (max-width: 968px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

/* ===== 联系区域 ===== */
.contact {
    padding: var(--spacing-xxl) 0;
    background:
        radial-gradient(900px 400px at 50% 120%, rgba(212, 175, 106, 0.1), transparent 65%),
        var(--bg-elevated);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.contact-content {
    text-align: center;
    max-width: 640px;
    margin: 0 auto;
}

.contact-content h2 {
    font-family: var(--serif);
    font-size: clamp(2.25rem, 5vw, 3.5rem);
    font-weight: 500;
    letter-spacing: -0.01em;
    margin-bottom: 1rem;
    color: var(--text);
}

.contact-content p {
    font-size: 1.125rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
}

.contact-email {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.1rem 2.5rem;
    border-radius: var(--radius-pill);
    background: var(--gold-grad);
    color: #17130a;
    font-size: 1.1rem;
    font-weight: 600;
    box-shadow: 0 12px 40px -12px rgba(212, 175, 106, 0.6);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.contact-email:hover {
    transform: translateY(-3px);
    box-shadow: 0 18px 52px -12px rgba(212, 175, 106, 0.85);
}

.contact-email svg {
    width: 18px;
    height: 18px;
}

/* ===== 页脚 ===== */
.footer {
    padding: 4rem 0 2rem;
    background: var(--bg);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

/* footer-links 仅作语义包装，让三个 footer-column 直接参与外层网格 */
.footer-links {
    display: contents;
}

.footer-brand {
    max-width: 300px;
}

.footer-logo-img {
    height: 28px;
    width: auto;
    display: block;
    margin-bottom: 1rem;
}

.footer-tagline {
    color: var(--text-2);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.footer-description {
    color: var(--text-muted);
    font-size: 0.85rem;
    line-height: 1.7;
}

.footer-column h4 {
    font-family: var(--mono);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    margin-bottom: 1.25rem;
    color: var(--gold);
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    margin-bottom: 0.7rem;
}

.footer-column a {
    color: var(--text-muted);
    font-size: 0.875rem;
    transition: color 0.3s ease, transform 0.3s ease;
    display: inline-block;
    position: relative;
}

.footer-column a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--gold);
    transition: width 0.3s ease;
}

.footer-column a:hover {
    color: var(--gold);
    transform: translateX(4px);
}

.footer-column a:hover::after {
    width: 100%;
}

.footer-social {
    display: flex;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.footer-social a {
    width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
}

.footer-social a::after {
    display: none;
}

.footer-social a svg {
    width: 15px;
    height: 15px;
}

.footer-social a:hover {
    border-color: var(--gold-deep);
    color: var(--gold);
    transform: translateY(-2px);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    flex-wrap: wrap;
}

.footer-bottom-left {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-bottom-left > p {
    color: var(--text-muted);
    font-size: 0.8125rem;
}

.footer-beian {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.footer-beian a {
    color: var(--text-muted);
    font-size: 0.75rem;
    transition: color 0.3s;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.footer-beian a svg {
    width: 13px;
    height: 13px;
    opacity: 0.6;
}

.footer-beian a:hover {
    color: var(--gold);
}

.footer-beian .separator {
    color: var(--border-strong);
    font-size: 0.75rem;
}

.footer-bottom-links {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.footer-bottom-links a {
    color: var(--text-muted);
    font-size: 0.8125rem;
    transition: color 0.3s;
}

.footer-bottom-links a:hover {
    color: var(--gold);
}

.footer-bottom-links .separator {
    color: var(--border-strong);
}

@media (max-width: 968px) {
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 2.5rem;
    }
    .footer-brand {
        grid-column: 1 / -1;
        max-width: 100%;
    }
}

@media (max-width: 768px) {
    .footer {
        padding: 3rem 0 1.5rem;
    }
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    .footer-bottom {
        flex-direction: column;
        text-align: center;
        align-items: center;
    }
    .footer-bottom-left {
        align-items: center;
    }
    .footer-beian {
        justify-content: center;
    }
}

/* ===== 无障碍：减少动效 ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    html {
        scroll-behavior: auto;
    }
}