/* ==========================================================================
   海普海洋建站 hippmarine.com - 全站主样式表
   风格：电脑壁纸风（墨黑 + 浅金 + 米白）
   布局：高低阶梯灵动节奏高级布局，海洋开阔视觉
   纯原生 CSS3，无任何框架依赖
   ========================================================================== */

/* ---------- 设计变量 ---------- */
:root {
  /* 主色：墨黑系（深海沉稳感） */
  --ink-50:  #F5F4F0;
  --ink-100: #E8E6DF;
  --ink-200: #C9C6BC;
  --ink-300: #9A968A;
  --ink-400: #6E6A5E;
  --ink-500: #4A473E;
  --ink-600: #33312B;
  --ink-700: #22211D;
  --ink-800: #151411;
  --ink-900: #0A0908;

  /* 辅色：浅金系（海洋贵金属感） */
  --gold-50:  #FDF8EC;
  --gold-100: #FAF0D4;
  --gold-200: #F5E0A8;
  --gold-300: #EED07C;
  --gold-400: #E8C050;
  --gold-500: #DDB02A;
  --gold-600: #C49818;
  --gold-700: #9E7A10;
  --gold-800: #7A5C08;

  /* 强调色：深海蓝金 */
  --ocean-400: #3A6B8C;
  --ocean-500: #2A5470;
  --ocean-600: #1E3F55;

  /* 中性：米白与深墨 */
  --cream:    #FAF8F3;
  --milk:     #F5F2EA;
  --paper:    #EFECE3;
  --paper-2:  #E8E4D8;
  --charcoal: #1A1916;
  --smoke:    #2A2824;

  /* 功能 */
  --radius-sm: 6px;
  --radius:    14px;
  --radius-lg: 24px;
  --shadow-sm: 0 4px 16px rgba(10, 9, 8, 0.06);
  --shadow:    0 16px 44px rgba(10, 9, 8, 0.10);
  --shadow-lg: 0 28px 64px rgba(10, 9, 8, 0.18);
  --shadow-gold: 0 8px 32px rgba(221, 176, 42, 0.18);
  --container: 1260px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-600);
  background: var(--cream);
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; border: 0; }
a { color: inherit; text-decoration: none; transition: color .3s var(--ease); }
a:hover { color: var(--gold-600); }
ul, ol { list-style: none; }
button { font: inherit; cursor: pointer; border: 0; background: transparent; color: inherit; }
input, textarea, select { font: inherit; color: inherit; }

h1, h2, h3, h4, h5 {
  color: var(--ink-800);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(2rem, 4vw, 3.4rem); }
h2 { font-size: clamp(1.6rem, 2.8vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 1.8vw, 1.55rem); }
h4 { font-size: 1.1rem; }
p  { color: var(--ink-500); }

/* ---------- 容器 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}
.container-narrow { max-width: 880px; }
.container-wide   { max-width: 1480px; }
section { position: relative; }
.text-center { text-align: center; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mt-5 { margin-top: 3rem; }

/* ==========================================================================
   顶部导航
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(250, 248, 243, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: all .4s var(--ease);
}
.site-header.scrolled {
  background: rgba(250, 248, 243, 0.96);
  border-bottom-color: var(--ink-100);
  box-shadow: 0 4px 24px rgba(10, 9, 8, 0.06);
}
.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.brand img { width: 40px; height: 40px; border-radius: 8px; }
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.brand-text strong {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--ink-800);
  letter-spacing: 0.02em;
}
.brand-text small {
  font-size: 0.62rem;
  color: var(--gold-600);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 600;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  justify-content: center;
}
.main-nav > li { position: relative; }
.main-nav > li > a {
  display: block;
  padding: 10px 14px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--ink-600);
  border-radius: 8px;
  transition: all .3s var(--ease);
  position: relative;
}
.main-nav > li > a:hover,
.main-nav > li.active > a {
  color: var(--gold-700);
  background: var(--gold-50);
}
.main-nav > li.has-sub > a::after {
  content: '';
  display: inline-block;
  width: 0; height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  margin-left: 6px;
  vertical-align: middle;
  transition: transform .3s;
}
.main-nav > li.has-sub:hover > a::after { transform: rotate(180deg); }

/* 下拉菜单 */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(12px);
  min-width: 260px;
  background: var(--cream);
  border: 1px solid var(--ink-100);
  border-radius: 14px;
  padding: 10px;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: all .35s var(--ease);
  z-index: 100;
}
.main-nav > li.has-sub:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.dropdown-menu li a {
  display: block;
  padding: 10px 14px;
  font-size: 0.88rem;
  color: var(--ink-500);
  border-radius: 8px;
  transition: all .25s;
}
.dropdown-menu li a:hover {
  background: var(--gold-50);
  color: var(--gold-700);
  padding-left: 18px;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 10px 22px;
  background: var(--ink-800);
  color: var(--cream) !important;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: 10px;
  transition: all .3s var(--ease);
  flex-shrink: 0;
}
.nav-cta:hover {
  background: var(--gold-600);
  color: var(--ink-900) !important;
  transform: translateY(-2px);
  box-shadow: var(--shadow-gold);
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  z-index: 1001;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--ink-800);
  border-radius: 2px;
  transition: all .3s var(--ease);
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 移动端抽屉 */
.mobile-drawer {
  position: fixed;
  top: 0; right: -320px;
  width: 300px;
  height: 100vh;
  background: var(--cream);
  z-index: 999;
  padding: 90px 24px 40px;
  overflow-y: auto;
  transition: right .4s var(--ease);
  box-shadow: -8px 0 40px rgba(0,0,0,0.1);
}
.mobile-drawer.open { right: 0; }
.mobile-drawer li a {
  display: block;
  padding: 14px 12px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink-700);
  border-bottom: 1px solid var(--ink-100);
}
.mobile-drawer li.has-sub > a { cursor: pointer; }
.mobile-sub { padding-left: 16px; }
.mobile-sub li a { font-size: 0.85rem; font-weight: 400; color: var(--ink-500); }

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 9, 8, 0.5);
  z-index: 998;
  opacity: 0;
  visibility: hidden;
  transition: all .3s;
}
.overlay.show { opacity: 1; visibility: visible; }

/* ==========================================================================
   通用区块
   ========================================================================== */
.section {
  padding: 90px 0;
  position: relative;
  overflow: hidden;
}
.section-sm { padding: 60px 0; }
.section-lg { padding: 120px 0; }

.section-dark {
  background: var(--ink-900);
  color: var(--cream);
}
.section-dark h1, .section-dark h2, .section-dark h3, .section-dark h4 { color: var(--cream); }
.section-dark p { color: var(--ink-300); }

.section-gold {
  background: linear-gradient(135deg, var(--gold-50) 0%, var(--cream) 100%);
}
.section-paper { background: var(--paper); }

/* 区块头部 */
.section-head {
  max-width: 720px;
  margin-bottom: 56px;
}
.section-head.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold-600);
  margin-bottom: 18px;
}
.eyebrow.warm { color: var(--gold-700); }
.eyebrow::before {
  content: '';
  width: 28px;
  height: 1px;
  background: var(--gold-500);
}
.section-head.center .eyebrow::before { display: none; }
.section-head h2 {
  margin-bottom: 16px;
}
.section-head p {
  font-size: 1.02rem;
  line-height: 1.8;
}

/* ==========================================================================
   按钮
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 30px;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: 10px;
  transition: all .35s var(--ease);
  cursor: pointer;
  border: 1.5px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: var(--ink-800);
  color: var(--cream);
}
.btn-primary:hover {
  background: var(--gold-600);
  color: var(--ink-900);
  transform: translateY(-3px);
  box-shadow: var(--shadow-gold);
}
.btn-gold {
  background: var(--gold-500);
  color: var(--ink-900);
}
.btn-gold:hover {
  background: var(--gold-600);
  transform: translateY(-3px);
  box-shadow: var(--shadow-gold);
}
.btn-outline {
  border-color: var(--ink-300);
  color: var(--ink-700);
  background: transparent;
}
.btn-outline:hover {
  border-color: var(--gold-500);
  color: var(--gold-700);
  background: var(--gold-50);
}
.btn-outline-light {
  border-color: rgba(250,248,243,0.3);
  color: var(--cream);
}
.btn-outline-light:hover {
  border-color: var(--gold-400);
  color: var(--gold-300);
  background: rgba(221,176,42,0.08);
}
.btn-lg { padding: 16px 38px; font-size: 1rem; }
.btn-sm { padding: 9px 20px; font-size: 0.82rem; }

/* ==========================================================================
   英雄区
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10,9,8,0.82) 0%, rgba(26,25,22,0.65) 50%, rgba(10,9,8,0.75) 100%);
}
.hero .container { position: relative; z-index: 2; }
.hero-content { max-width: 680px; }
.hero .eyebrow { color: var(--gold-400); }
.hero .eyebrow::before { background: var(--gold-400); }
.hero h1 {
  color: var(--cream);
  margin-bottom: 24px;
  font-weight: 800;
}
.hero h1 .accent {
  color: var(--gold-400);
  position: relative;
}
.hero-desc {
  font-size: 1.08rem;
  color: var(--ink-200);
  margin-bottom: 36px;
  line-height: 1.9;
  max-width: 580px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.hero-stats {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
  padding-top: 32px;
  border-top: 1px solid rgba(221,176,42,0.2);
}
.hero-stat .num {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--gold-400);
  line-height: 1;
}
.hero-stat .lbl {
  font-size: 0.82rem;
  color: var(--ink-300);
  margin-top: 6px;
  letter-spacing: 0.05em;
}

/* 首页英雄 - 阶梯网格 */
.hero-home {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 130px 0 90px;
  background: var(--ink-900);
  overflow: hidden;
}
.hero-home::before {
  content: '';
  position: absolute;
  top: -20%; right: -10%;
  width: 70%; height: 140%;
  background: radial-gradient(ellipse, rgba(221,176,42,0.12) 0%, transparent 70%);
  pointer-events: none;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}
.hero-text .eyebrow { color: var(--gold-400); }
.hero-text .eyebrow::before { background: var(--gold-400); }
.hero-title {
  color: var(--cream);
  margin-bottom: 22px;
  font-weight: 800;
}
.hero-title .accent { color: var(--gold-400); }
.hero-text .hero-desc { color: var(--ink-300); }

/* 阶梯拼贴 */
.hero-quilt {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 16px;
}
.q-cell {
  border-radius: 16px;
  overflow: hidden;
  position: relative;
}
.q-cell img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.q1 {
  grid-column: 1 / -1;
  height: 240px;
}
.q1 .q-badge {
  position: absolute;
  top: 16px; left: 16px;
  background: rgba(10,9,8,0.7);
  backdrop-filter: blur(8px);
  color: var(--gold-300);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
}
.q2, .q3 {
  height: 130px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 20px;
  background: var(--smoke);
  border: 1px solid rgba(221,176,42,0.15);
}

/* ==========================================================================
   渐入动画
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity .8s var(--ease-out), transform .8s var(--ease-out);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: .1s; }
.reveal-delay-2 { transition-delay: .2s; }
.reveal-delay-3 { transition-delay: .3s; }
.reveal-delay-4 { transition-delay: .4s; }

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  background: var(--ink-900);
  color: var(--ink-300);
  padding: 70px 0 0;
  position: relative;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 50px;
}
.footer-brand .brand-text strong { color: var(--cream); }
.footer-brand p {
  color: var(--ink-400);
  font-size: 0.9rem;
  margin-top: 18px;
  line-height: 1.8;
}
.footer-col h5 {
  color: var(--cream);
  font-size: 0.95rem;
  margin-bottom: 22px;
  font-weight: 700;
}
.footer-col ul li {
  margin-bottom: 12px;
}
.footer-col ul li a {
  color: var(--ink-400);
  font-size: 0.88rem;
  transition: all .25s;
}
.footer-col ul li a:hover {
  color: var(--gold-400);
  padding-left: 4px;
}
.footer-contact p {
  color: var(--ink-400);
  font-size: 0.88rem;
  margin-bottom: 12px;
  display: flex;
  gap: 8px;
}
.footer-contact p strong {
  color: var(--gold-500);
  font-weight: 600;
  min-width: 56px;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p {
  color: var(--ink-500);
  font-size: 0.82rem;
}
.footer-bottom a { color: var(--ink-400); }
.footer-bottom a:hover { color: var(--gold-400); }
.icp-record { color: var(--ink-500); font-size: 0.82rem; }

/* ==========================================================================
   内页通用
   ========================================================================== */
.page-banner {
  position: relative;
  padding: 160px 0 90px;
  background: var(--ink-900);
  overflow: hidden;
}
.page-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10,9,8,0.9) 0%, rgba(30,63,85,0.4) 100%);
  z-index: 1;
}
.page-banner-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.page-banner-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
}
.page-banner .container { position: relative; z-index: 2; }
.page-banner h1 {
  color: var(--cream);
  margin-bottom: 16px;
}
.page-banner .breadcrumb {
  display: flex;
  gap: 10px;
  align-items: center;
  font-size: 0.88rem;
  color: var(--ink-300);
}
.page-banner .breadcrumb a { color: var(--gold-400); }
.page-banner .breadcrumb span { color: var(--ink-500); }
.page-banner p {
  color: var(--ink-300);
  max-width: 600px;
  margin-top: 16px;
  font-size: 1rem;
}

/* 面包屑 */
.breadcrumb-nav {
  padding: 18px 0;
  background: var(--paper);
  border-bottom: 1px solid var(--ink-100);
}
.breadcrumb-nav .container {
  display: flex;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--ink-400);
}
.breadcrumb-nav a { color: var(--gold-600); }
.breadcrumb-nav a:hover { color: var(--gold-700); }

/* ==========================================================================
   卡片通用
   ========================================================================== */
.card {
  background: var(--cream);
  border-radius: var(--radius);
  border: 1px solid var(--ink-100);
  overflow: hidden;
  transition: all .4s var(--ease);
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--gold-200);
}
.card-img {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/10;
}
.card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .6s var(--ease);
}
.card:hover .card-img img { transform: scale(1.06); }
.card-body { padding: 24px; }
.card-body h4 {
  margin-bottom: 10px;
  font-size: 1.08rem;
}
.card-body p {
  font-size: 0.9rem;
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-meta {
  display: flex;
  gap: 16px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--ink-100);
  font-size: 0.8rem;
  color: var(--ink-400);
}

/* ==========================================================================
   网格通用
   ========================================================================== */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.grid-6 { display: grid; grid-template-columns: repeat(6, 1fr); gap: 20px; }

/* ==========================================================================
   阶梯布局特色 - 高低错落
   ========================================================================== */
.stagger-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: start;
}
.stagger-grid > *:nth-child(2) { margin-top: 48px; }
.stagger-grid > *:nth-child(3) { margin-top: 24px; }
.stagger-grid > *:nth-child(5) { margin-top: 36px; }
.stagger-grid > *:nth-child(6) { margin-top: 12px; }

/* 对角分割背景 */
.diagonal-bg {
  position: relative;
}
.diagonal-bg::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 60%;
  background: var(--ink-900);
  z-index: 0;
}
.diagonal-bg > * { position: relative; z-index: 1; }

/* 金色装饰线 */
.gold-line {
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, var(--gold-500), transparent);
  margin: 16px 0;
}
.gold-line.center { margin: 16px auto; }

/* 标签 */
.tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--gold-50);
  color: var(--gold-700);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 20px;
  letter-spacing: 0.03em;
}
.tag-dark {
  background: rgba(221,176,42,0.12);
  color: var(--gold-400);
}

/* 回到顶部 */
.back-to-top {
  position: fixed;
  bottom: 32px; right: 32px;
  width: 48px; height: 48px;
  background: var(--ink-800);
  color: var(--cream);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 900;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all .35s var(--ease);
  box-shadow: var(--shadow);
}
.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--gold-600);
  color: var(--ink-900);
}