/* ============================================================
   香港黑曜药业有限公司 - 暗金黑曜风格样式表
   作者：黑曜药业前端团队
   说明：纯黑曜石背景 + 金丝纹理 + scroll-snap 全页滑动
   ============================================================ */

/* ---------- CSS 变量：暗金黑曜色板 ---------- */
:root {
    /* 黑曜石色阶 */
    --obsidian-900: #0a0a0a;
    --obsidian-800: #121212;
    --obsidian-700: #1a1a1a;
    --obsidian-600: #242424;
    --obsidian-500: #2e2e2e;

    /* 金丝色阶 */
    --gold-bright: #FFD700;
    --gold-main: #D4AF37;
    --gold-deep: #B8860B;
    --gold-soft: rgba(212, 175, 55, 0.15);

    /* 文字色 */
    --text-main: #f5f0e0;
    --text-muted: #a89f8a;
    --text-dim: #6b6557;

    /* 字体 */
    --font-title: 'Cormorant Garamond', 'Noto Serif SC', serif;
    --font-body: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;

    /* 尺寸 */
    --nav-h: 72px;
    --max-width: 1200px;
    --radius: 4px;
}

/* ---------- 全局重置 ---------- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    /* scroll-snap 垂直全页滑动吸附 */
    scroll-snap-type: y mandatory;
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-h);
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    color: var(--text-main);
    line-height: 1.7;
    overflow-x: hidden;
    /* 黑曜石质感：多层径向渐变模拟宝石光泽 */
    background-color: var(--obsidian-900);
    background-image:
        radial-gradient(ellipse at 20% 0%, rgba(212, 175, 55, 0.08) 0%, transparent 45%),
        radial-gradient(ellipse at 80% 100%, rgba(184, 134, 11, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, var(--obsidian-800) 0%, var(--obsidian-900) 70%);
    background-attachment: fixed;
}

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

a {
    color: var(--gold-main);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--gold-bright);
}

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    color: inherit;
}

/* ---------- 通用容器 ---------- */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- 主滚动区（承载 scroll-snap section） ---------- */
.main-scroll {
    width: 100%;
}

/* ---------- 每个 section 全屏吸附 ---------- */
.section {
    min-height: 100vh;
    scroll-snap-align: start;
    padding: calc(var(--nav-h) + 60px) 0 80px;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* 客户案例板块：取消强制全屏高度和垂直居中，避免内容偏移 */
.cases.section {
    min-height: auto;
    justify-content: flex-start;
    padding-top: calc(var(--nav-h) + 60px);
    padding-bottom: 80px;
}

/* ============================================================
   1. 导航栏 + Logo
   ============================================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-h);
    z-index: 1000;
    /* 黑曜石质感导航：半透明 + 金色底边 */
    background: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(212, 175, 55, 0.25);
    transition: background 0.4s ease, border-color 0.4s ease;
}

.navbar.scrolled {
    background: rgba(10, 10, 10, 0.95);
    border-bottom-color: rgba(212, 175, 55, 0.5);
}

.nav-container {
    max-width: var(--max-width);
    height: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--gold-bright);
    font-family: var(--font-title);
}

.logo-icon {
    font-size: 1.4rem;
    color: var(--gold-main);
    /* 金光闪耀脉冲 */
    animation: goldPulse 3s ease-in-out infinite;
    text-shadow: 0 0 12px rgba(212, 175, 55, 0.6);
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 2px;
    background: linear-gradient(135deg, var(--gold-bright), var(--gold-main), var(--gold-deep));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    gap: 36px;
}

.nav-link {
    position: relative;
    color: var(--text-main);
    font-size: 0.95rem;
    font-weight: 400;
    letter-spacing: 1px;
    padding: 6px 0;
    transition: color 0.3s ease;
}

/* 金丝下划线 hover 动画 */
.nav-link::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--gold-bright), transparent);
    transition: width 0.4s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--gold-bright);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* 汉堡菜单按钮 */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
}

.hamburger span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--gold-main);
    transition: transform 0.35s ease, opacity 0.3s ease;
}

.hamburger.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ============================================================
   2. 全屏轮播图
   ============================================================ */
.hero {
    padding: 0;
    min-height: 100vh;
}

.carousel {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
}

.carousel-track {
    display: flex;
    width: 300%;
    height: 100%;
    transition: transform 0.9s cubic-bezier(0.77, 0, 0.175, 1);
}

.carousel-slide {
    position: relative;
    width: 33.3333%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 三张轮播图背景 */
.slide-1 {
    background-image: url('https://trae-api-cn.mchost.guru/api/ide/v1/text_to_image?prompt=black%20obsidian%20luxury%20pharmaceutical%20products%20gold%20accents&image_size=landscape_16_9');
}

.slide-2 {
    background-image: url('https://trae-api-cn.mchost.guru/api/ide/v1/text_to_image?prompt=premium%20black%20gold%20health%20supplements%20luxury%20packaging&image_size=landscape_16_9');
}

.slide-3 {
    background-image: url('https://trae-api-cn.mchost.guru/api/ide/v1/text_to_image?prompt=dark%20luxury%20pharmaceutical%20laboratory%20gold%20lighting&image_size=landscape_16_9');
}

/* 黑曜石暗化遮罩 */
.slide-overlay {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at center, rgba(10, 10, 10, 0.4) 0%, rgba(10, 10, 10, 0.9) 100%),
        linear-gradient(180deg, rgba(10, 10, 10, 0.6) 0%, transparent 40%, rgba(10, 10, 10, 0.8) 100%);
}

.slide-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 0 24px;
    max-width: 900px;
    animation: slideFadeIn 1.2s ease;
}

.slide-eyebrow {
    font-size: 0.85rem;
    letter-spacing: 4px;
    color: var(--gold-main);
    margin-bottom: 24px;
    text-transform: uppercase;
}

.slide-title {
    font-family: var(--font-title);
    font-size: clamp(2.5rem, 6vw, 5rem);
    font-weight: 600;
    line-height: 1.15;
    color: var(--text-main);
    margin-bottom: 20px;
    text-shadow: 0 4px 30px rgba(0, 0, 0, 0.8);
}

.slide-subtitle {
    font-size: clamp(0.8rem, 1.5vw, 1rem);
    letter-spacing: 3px;
    color: var(--gold-main);
    margin-bottom: 18px;
}

.slide-desc {
    font-size: clamp(0.95rem, 1.8vw, 1.15rem);
    color: var(--text-muted);
    margin-bottom: 36px;
}

/* 金色按钮 */
.btn-gold {
    display: inline-block;
    padding: 14px 40px;
    font-size: 0.95rem;
    letter-spacing: 2px;
    color: var(--gold-bright);
    border: 1px solid var(--gold-main);
    background: rgba(212, 175, 55, 0.05);
    position: relative;
    overflow: hidden;
    transition: color 0.4s ease, box-shadow 0.4s ease;
}

/* 金光闪耀扫过效果 */
.btn-gold::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(120deg, transparent, rgba(255, 215, 0, 0.4), transparent);
    transition: left 0.6s ease;
}

.btn-gold:hover {
    color: var(--obsidian-900);
    background: var(--gold-bright);
    box-shadow: 0 0 30px rgba(212, 175, 55, 0.5);
}

.btn-gold:hover::before {
    left: 100%;
}

/* 圆点指示器 */
.carousel-dots {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 14px;
    z-index: 3;
}

.carousel-dot {
    width: 36px;
    height: 3px;
    background: rgba(212, 175, 55, 0.3);
    cursor: pointer;
    transition: background 0.3s ease, width 0.3s ease;
}

.carousel-dot.active {
    background: var(--gold-bright);
    width: 56px;
    box-shadow: 0 0 10px rgba(255, 215, 0, 0.6);
}

/* 左右箭头 */
.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 52px;
    height: 52px;
    font-size: 2rem;
    color: var(--gold-main);
    border: 1px solid rgba(212, 175, 55, 0.4);
    background: rgba(10, 10, 10, 0.4);
    z-index: 3;
    transition: all 0.3s ease;
}

.carousel-btn:hover {
    color: var(--obsidian-900);
    background: var(--gold-bright);
    border-color: var(--gold-bright);
}

.carousel-prev {
    left: 30px;
}

.carousel-next {
    right: 30px;
}

/* 金丝流动装饰条 */
.gold-flow {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--gold-bright), transparent);
    background-size: 200% 100%;
    animation: goldFlow 4s linear infinite;
    z-index: 3;
}

/* ============================================================
   通用：章节标题
   ============================================================ */
.section-head {
    text-align: center;
    margin-bottom: 60px;
}

.section-eyebrow {
    font-size: 0.8rem;
    letter-spacing: 5px;
    color: var(--gold-main);
    text-transform: uppercase;
    margin-bottom: 14px;
}

.section-title {
    font-family: var(--font-title);
    font-size: clamp(2.2rem, 4.5vw, 3.5rem);
    font-weight: 600;
    color: var(--text-main);
    letter-spacing: 2px;
}

.title-divider {
    display: flex;
    justify-content: center;
    margin-top: 20px;
}

.title-divider span {
    width: 80px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--gold-main), transparent);
    position: relative;
}

.title-divider span::after {
    content: '◆';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--gold-main);
    font-size: 0.7rem;
    background: var(--obsidian-900);
    padding: 0 6px;
}

.section-intro {
    max-width: 640px;
    margin: 24px auto 0;
    color: var(--text-muted);
    font-size: 1rem;
}

/* ============================================================
   3. 关于我们
   ============================================================ */
.about-grid {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 70px;
}

.about-lead {
    font-family: var(--font-title);
    font-size: 1.6rem;
    color: var(--gold-main);
    margin-bottom: 24px;
    font-style: italic;
}

.about-text p {
    color: var(--text-muted);
    margin-bottom: 18px;
    font-size: 1.02rem;
}

.about-media {
    position: relative;
}

.about-img {
    width: 100%;
    aspect-ratio: 4 / 5;
    background-image: url('https://trae-api-cn.mchost.guru/api/ide/v1/text_to_image?prompt=luxury%20black%20obsidian%20building%20gold%20architecture%20elegant&image_size=landscape_16_9');
    background-size: cover;
    background-position: center;
    border: 1px solid rgba(212, 175, 55, 0.3);
    position: relative;
}

/* 金色相框装饰 */
.img-frame {
    position: absolute;
    top: 16px;
    left: 16px;
    right: -16px;
    bottom: -16px;
    border: 1px solid var(--gold-main);
    z-index: -1;
}

/* 统计数据 */
.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    padding: 50px 0;
    border-top: 1px solid rgba(212, 175, 55, 0.2);
    border-bottom: 1px solid rgba(212, 175, 55, 0.2);
}

.stat-item {
    text-align: center;
    position: relative;
}

.stat-item:not(:last-child)::after {
    content: '';
    position: absolute;
    right: -15px;
    top: 15%;
    height: 70%;
    width: 1px;
    background: rgba(212, 175, 55, 0.2);
}

.stat-num {
    font-family: var(--font-title);
    font-size: 3.2rem;
    font-weight: 700;
    color: var(--gold-bright);
    line-height: 1;
    text-shadow: 0 0 20px rgba(212, 175, 55, 0.3);
}

.stat-unit,
.stat-plus {
    font-family: var(--font-title);
    font-size: 1.4rem;
    color: var(--gold-main);
    font-weight: 600;
}

.stat-label {
    margin-top: 10px;
    color: var(--text-muted);
    font-size: 0.95rem;
    letter-spacing: 1px;
}

/* ============================================================
   4. 服务介绍（黑曜卡片 3D 翻转）
   ============================================================ */
.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.service-card {
    perspective: 1200px;
    height: 360px;
}

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 桌面端 hover 翻转，移动端由 JS 控制 tap 翻转 */
@media (hover: hover) {
    .service-card:hover .card-inner,
    .service-card.flipped .card-inner {
        transform: rotateY(180deg);
    }
}

.service-card.flipped .card-inner {
    transform: rotateY(180deg);
}

.card-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    /* 黑曜石质感卡片 */
    background:
        radial-gradient(circle at 30% 20%, rgba(212, 175, 55, 0.1), transparent 60%),
        linear-gradient(160deg, var(--obsidian-700), var(--obsidian-900));
    border: 1px solid rgba(212, 175, 55, 0.25);
    padding: 40px 28px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    transition: box-shadow 0.4s ease, border-color 0.4s ease;
}

.service-card:hover .card-face {
    border-color: rgba(212, 175, 55, 0.6);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6), 0 0 30px rgba(212, 175, 55, 0.15);
}

.card-back {
    transform: rotateY(180deg);
    align-items: stretch;
    text-align: left;
}

/* 正面卡片：读取 JS 设置的 --rx/--ry 实现 3D 倾斜（默认 0deg） */
.card-front {
    transform: rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg));
    transition: transform 0.15s ease-out, box-shadow 0.4s ease, border-color 0.4s ease;
}

.card-num {
    position: absolute;
    top: 20px;
    right: 24px;
    font-family: var(--font-title);
    font-size: 2.4rem;
    color: rgba(212, 175, 55, 0.25);
    font-weight: 700;
}

.card-icon {
    font-size: 3rem;
    color: var(--gold-main);
    margin-bottom: 24px;
    text-shadow: 0 0 20px rgba(212, 175, 55, 0.5);
    animation: goldPulse 4s ease-in-out infinite;
}

.card-title {
    font-family: var(--font-title);
    font-size: 1.6rem;
    color: var(--text-main);
    margin-bottom: 16px;
    letter-spacing: 1px;
}

.card-hint {
    font-size: 0.85rem;
    color: var(--gold-deep);
    letter-spacing: 1px;
}

.card-back p {
    color: var(--text-muted);
    font-size: 0.98rem;
    line-height: 1.8;
}

/* ============================================================
   5. 客户案例（横向滑动）
   ============================================================ */
.cases-slider {
    width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 10px 0 30px;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--gold-main) transparent;
}

.cases-slider::-webkit-scrollbar {
    height: 4px;
}

.cases-slider::-webkit-scrollbar-thumb {
    background: var(--gold-main);
}

.cases-track {
    display: flex;
    gap: 28px;
    width: max-content;
    /* 左右内边距与 .container 对齐，确保首张卡片与标题左对齐 */
    padding-left: max(24px, calc((100vw - var(--max-width)) / 2 + 24px));
    padding-right: max(24px, calc((100vw - var(--max-width)) / 2 + 24px));
}

.case-card {
    flex: 0 0 300px;
    scroll-snap-align: center;
    background: var(--obsidian-700);
    border: 1px solid rgba(212, 175, 55, 0.2);
    overflow: hidden;
    transition: transform 0.4s ease, box-shadow 0.4s ease, border-color 0.4s ease;
}

.case-card:hover {
    transform: translateY(-8px);
    border-color: var(--gold-main);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5), 0 0 25px rgba(212, 175, 55, 0.15);
}

/* 方形案例图片 */
.case-img {
    width: 100%;
    aspect-ratio: 1 / 1;
    background-size: cover;
    background-position: center;
    position: relative;
}

.case-img::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 50%, rgba(10, 10, 10, 0.7) 100%);
}

.case-img-1 {
    background-image: url('https://trae-api-cn.mchost.guru/api/ide/v1/text_to_image?prompt=luxury%20portrait%20elegant%20man%20black%20gold%20background&image_size=square');
}

.case-img-2 {
    background-image: url('https://trae-api-cn.mchost.guru/api/ide/v1/text_to_image?prompt=sophisticated%20woman%20portrait%20black%20gold%20luxury&image_size=square');
}

.case-img-3 {
    background-image: url('https://trae-api-cn.mchost.guru/api/ide/v1/text_to_image?prompt=distinguished%20gentleman%20portrait%20dark%20elegant&image_size=square');
}

.case-img-4 {
    background-image: url('https://trae-api-cn.mchost.guru/api/ide/v1/text_to_image?prompt=elegant%20lady%20portrait%20black%20gold%20sophisticated&image_size=square');
}

.case-caption {
    padding: 24px;
}

.case-tag {
    font-size: 0.75rem;
    letter-spacing: 1px;
    color: var(--gold-main);
    text-transform: uppercase;
}

.case-name {
    font-family: var(--font-title);
    font-size: 1.5rem;
    color: var(--text-main);
    margin: 8px 0 12px;
}

.case-quote {
    color: var(--text-muted);
    font-size: 0.92rem;
    font-style: italic;
    line-height: 1.6;
}

.slider-hint {
    text-align: center;
    color: var(--text-dim);
    font-size: 0.85rem;
    letter-spacing: 2px;
    margin-top: 20px;
}

/* ============================================================
   6. 新闻资讯
   ============================================================ */
.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.news-card {
    display: flex;
    gap: 20px;
    padding: 28px;
    background:
        radial-gradient(circle at 0% 0%, rgba(212, 175, 55, 0.06), transparent 50%),
        linear-gradient(160deg, var(--obsidian-700), var(--obsidian-800));
    border: 1px solid rgba(212, 175, 55, 0.2);
    transition: transform 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

.news-card:hover {
    transform: translateY(-6px);
    border-color: var(--gold-main);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
}

.news-date {
    flex-shrink: 0;
    text-align: center;
    border-right: 1px solid rgba(212, 175, 55, 0.25);
    padding-right: 20px;
    min-width: 70px;
}

.news-day {
    display: block;
    font-family: var(--font-title);
    font-size: 2.6rem;
    font-weight: 700;
    color: var(--gold-bright);
    line-height: 1;
}

.news-month {
    display: block;
    font-size: 0.8rem;
    color: var(--gold-deep);
    margin-top: 6px;
    letter-spacing: 1px;
}

.news-body {
    flex: 1;
}

.news-tag {
    display: inline-block;
    font-size: 0.72rem;
    letter-spacing: 1px;
    color: var(--obsidian-900);
    background: var(--gold-main);
    padding: 2px 10px;
    margin-bottom: 10px;
    text-transform: uppercase;
}

.news-title {
    font-family: var(--font-title);
    font-size: 1.2rem;
    color: var(--text-main);
    margin-bottom: 10px;
    line-height: 1.4;
}

.news-body p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 14px;
}

.news-link {
    font-size: 0.85rem;
    letter-spacing: 1px;
    border-bottom: 1px solid transparent;
    transition: border-color 0.3s ease;
}

.news-link:hover {
    border-bottom-color: var(--gold-bright);
}

/* ============================================================
   7. 常见问题 FAQ（手风琴）
   ============================================================ */
.faq-list {
    max-width: 820px;
    margin: 0 auto;
}

.faq-item {
    border: 1px solid rgba(212, 175, 55, 0.2);
    margin-bottom: 16px;
    background:
        linear-gradient(160deg, var(--obsidian-700), var(--obsidian-800));
    transition: border-color 0.3s ease;
    overflow: hidden;
}

.faq-item.open {
    border-color: var(--gold-main);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px 28px;
    text-align: left;
    color: var(--text-main);
    font-size: 1.05rem;
    transition: color 0.3s ease;
}

.faq-question:hover {
    color: var(--gold-bright);
}

.faq-q-text {
    flex: 1;
    letter-spacing: 0.5px;
}

.faq-q-icon {
    font-size: 1.4rem;
    color: var(--gold-main);
    transition: transform 0.4s ease;
    margin-left: 16px;
}

.faq-item.open .faq-q-icon {
    transform: rotate(45deg);
    color: var(--gold-bright);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease, padding 0.4s ease;
    padding: 0 28px;
}

.faq-item.open .faq-answer {
    max-height: 300px;
    padding: 0 28px 24px;
}

.faq-answer p {
    color: var(--text-muted);
    font-size: 0.96rem;
    line-height: 1.8;
}

/* ============================================================
   8. 联系我们
   ============================================================ */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: 50px;
    align-items: start;
}

.contact-info {
    padding: 40px;
    background:
        radial-gradient(circle at 100% 0%, rgba(212, 175, 55, 0.1), transparent 50%),
        linear-gradient(160deg, var(--obsidian-700), var(--obsidian-900));
    border: 1px solid rgba(212, 175, 55, 0.3);
}

.info-title {
    font-family: var(--font-title);
    font-size: 1.8rem;
    color: var(--gold-bright);
    margin-bottom: 6px;
}

.info-en {
    color: var(--gold-deep);
    font-size: 0.9rem;
    letter-spacing: 1px;
    margin-bottom: 30px;
}

.info-list li {
    padding: 14px 0;
    border-bottom: 1px solid rgba(212, 175, 55, 0.12);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.info-label {
    font-size: 0.78rem;
    color: var(--gold-deep);
    letter-spacing: 2px;
    text-transform: uppercase;
}

.info-value {
    color: var(--text-main);
    font-size: 1rem;
}

/* 黑曜质感表单，金色边框 */
.contact-form {
    padding: 40px;
    background: var(--obsidian-800);
    border: 1px solid var(--gold-main);
    box-shadow: 0 0 30px rgba(212, 175, 55, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    margin-bottom: 22px;
}

.form-group label {
    display: block;
    font-size: 0.88rem;
    color: var(--gold-main);
    margin-bottom: 8px;
    letter-spacing: 1px;
}

.req {
    color: var(--gold-bright);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 14px;
    background: var(--obsidian-900);
    border: 1px solid rgba(212, 175, 55, 0.3);
    color: var(--text-main);
    font-family: var(--font-body);
    font-size: 0.95rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--gold-bright);
    box-shadow: 0 0 12px rgba(212, 175, 55, 0.2);
}

.form-group input.invalid,
.form-group textarea.invalid {
    border-color: #c0392b;
}

.error-msg {
    display: block;
    color: #e57373;
    font-size: 0.8rem;
    margin-top: 6px;
    min-height: 18px;
}

.btn-submit {
    width: 100%;
    margin-top: 6px;
}

.form-success {
    display: none;
    margin-top: 18px;
    padding: 14px;
    text-align: center;
    color: var(--gold-bright);
    background: rgba(212, 175, 55, 0.1);
    border: 1px solid var(--gold-main);
    font-size: 0.92rem;
}

.form-success.show {
    display: block;
    animation: slideFadeIn 0.5s ease;
}

/* ============================================================
   9. 页脚 + 友情链接
   ============================================================ */
.footer {
    background:
        radial-gradient(ellipse at 50% 0%, rgba(212, 175, 55, 0.08), transparent 60%),
        var(--obsidian-900);
    border-top: 1px solid rgba(212, 175, 55, 0.25);
    padding: 60px 0 24px;
    scroll-snap-align: start;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr 1fr;
    gap: 50px;
    margin-bottom: 40px;
}

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

.footer-slogan {
    font-family: var(--font-title);
    color: var(--gold-main);
    font-style: italic;
    font-size: 1.1rem;
    margin-bottom: 6px;
}

.footer-en {
    color: var(--text-dim);
    font-size: 0.85rem;
    letter-spacing: 1px;
}

.footer-title {
    font-family: var(--font-title);
    font-size: 1.2rem;
    color: var(--text-main);
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(212, 175, 55, 0.2);
}

.footer-links li {
    margin-bottom: 12px;
    color: var(--text-muted);
    font-size: 0.92rem;
}

.footer-links a {
    color: var(--text-muted);
    transition: color 0.3s ease, padding-left 0.3s ease;
}

.footer-links a:hover {
    color: var(--gold-bright);
    padding-left: 6px;
}

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid rgba(212, 175, 55, 0.15);
    color: var(--text-dim);
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

/* ============================================================
   回到顶部按钮
   ============================================================ */
.back-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    font-size: 1.4rem;
    color: var(--gold-bright);
    border: 1px solid var(--gold-main);
    background: rgba(10, 10, 10, 0.8);
    border-radius: 50%;
    z-index: 900;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.4s ease;
}

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

.back-top:hover {
    background: var(--gold-bright);
    color: var(--obsidian-900);
    box-shadow: 0 0 20px rgba(212, 175, 55, 0.5);
}

/* ============================================================
   IntersectionObserver 入场动画
   ============================================================ */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.9s ease, transform 0.9s ease;
}

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

/* 逐项延迟 */
.services-grid .reveal:nth-child(2),
.news-grid .reveal:nth-child(2),
.cases-track .reveal:nth-child(2) {
    transition-delay: 0.1s;
}

.services-grid .reveal:nth-child(3),
.news-grid .reveal:nth-child(3),
.cases-track .reveal:nth-child(3) {
    transition-delay: 0.2s;
}

.services-grid .reveal:nth-child(4),
.cases-track .reveal:nth-child(4) {
    transition-delay: 0.3s;
}

/* ============================================================
   关键帧动画
   ============================================================ */

/* 金光闪耀脉冲 */
@keyframes goldPulse {
    0%, 100% {
        text-shadow: 0 0 12px rgba(212, 175, 55, 0.5);
        transform: scale(1);
    }
    50% {
        text-shadow: 0 0 24px rgba(255, 215, 0, 0.9);
        transform: scale(1.08);
    }
}

/* 金丝流动 */
@keyframes goldFlow {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* 淡入上移 */
@keyframes slideFadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================================
   响应式：平板 (≤1024px)
   ============================================================ */
@media (max-width: 1024px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-media {
        max-width: 500px;
        margin: 0 auto;
    }

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

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

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 36px;
    }

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

    .footer-brand {
        grid-column: 1 / -1;
    }
}

/* ============================================================
   响应式：移动端 (≤768px)
   ============================================================ */
@media (max-width: 768px) {
    :root {
        --nav-h: 60px;
    }

    /* 汉堡菜单显示 */
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: var(--nav-h);
        left: 0;
        width: 100%;
        height: calc(100vh - var(--nav-h));
        flex-direction: column;
        justify-content: flex-start;
        gap: 0;
        background: rgba(10, 10, 10, 0.98);
        backdrop-filter: blur(16px);
        padding: 20px 0;
        transform: translateX(100%);
        transition: transform 0.4s ease;
        border-top: 1px solid rgba(212, 175, 55, 0.3);
    }

    .nav-menu.open {
        transform: translateX(0);
    }

    .nav-link {
        padding: 18px 40px;
        font-size: 1.05rem;
        border-bottom: 1px solid rgba(212, 175, 55, 0.1);
    }

    .logo-text {
        font-size: 1.25rem;
    }

    .section {
        padding: calc(var(--nav-h) + 40px) 0 60px;
    }

    .section-head {
        margin-bottom: 40px;
    }

    /* 轮播图箭头隐藏，靠滑动 + 圆点 */
    .carousel-btn {
        display: none;
    }

    .carousel-dots {
        bottom: 28px;
    }

    /* 关于统计：2列 */
    .stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 36px 20px;
    }

    .stat-item:nth-child(2)::after {
        display: none;
    }

    .stat-num {
        font-size: 2.6rem;
    }

    /* 服务卡片：单列 */
    .services-grid {
        grid-template-columns: 1fr;
        max-width: 380px;
        margin: 0 auto;
        gap: 20px;
    }

    .service-card {
        height: 300px;
    }

    /* 案例卡片 */
    .case-card {
        flex: 0 0 260px;
    }

    /* 表单单列 */
    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .contact-form,
    .contact-info {
        padding: 28px 20px;
    }

    /* 页脚单列 */
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-brand {
        grid-column: auto;
    }

    .back-top {
        bottom: 20px;
        right: 20px;
        width: 42px;
        height: 42px;
    }

    /* 移动端关闭 scroll-snap 强制吸附，避免内容溢出难以浏览 */
    html {
        scroll-snap-type: none;
    }

    .section {
        min-height: auto;
    }

    .hero,
    .carousel {
        min-height: 100vh;
        height: 100vh;
    }
}

/* ============================================================
   极小屏 (≤480px) 微调
   ============================================================ */
@media (max-width: 480px) {
    .container {
        padding: 0 18px;
    }

    .stat-num {
        font-size: 2.2rem;
    }

    .news-card {
        flex-direction: column;
        gap: 14px;
    }

    .news-date {
        border-right: none;
        border-bottom: 1px solid rgba(212, 175, 55, 0.25);
        padding-right: 0;
        padding-bottom: 14px;
        display: flex;
        align-items: baseline;
        gap: 10px;
    }

    /* 极小屏案例轨道内边距与 container 的 18px 对齐 */
    .cases-track {
        padding-left: 18px;
        padding-right: 18px;
    }
}

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

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