/* ============================================================
   大作咨询 DAZUO CONSULTING — 浅色高级咨询风
   品牌色取自 DAZUO Logo：橙红 #E85018 / 炭黑 #383838
   整体以米白为底，黑色仅用于强调，大幅缩减深色面积
   ============================================================ */
:root {
  --paper: #FFFFFF;
  --paper-2: #FAF9F7;
  --paper-3: #F4F2EF;
  --ink: #1F1F1F;
  --ink-2: #383838;
  --gray: #6B6B6B;
  --gray-light: #8C8C8C;
  --brand: #E85018;
  --brand-light: #FF6A33;
  --brand-deep: #C23E0E;
  --line: rgba(0, 0, 0, .09);
  --line-brand: rgba(232, 80, 24, .28);
  --shadow: 0 6px 24px rgba(0, 0, 0, .06);
  --shadow-hi: 0 16px 44px rgba(0, 0, 0, .12);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

.container { max-width: 1180px; margin: 0 auto; padding: 0 32px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block;
  padding: 13px 34px;
  border-radius: 40px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 1px;
  transition: all .3s ease;
  cursor: pointer;
  border: 1px solid transparent;
}
.btn-brand {
  background: linear-gradient(135deg, var(--brand-light) 0%, var(--brand-deep) 100%);
  color: #fff;
}
.btn-brand:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(232,80,24,.32); }
.btn-ghost { border-color: var(--line-brand); color: var(--brand); background: #fff; }
.btn-ghost:hover { border-color: var(--brand); background: rgba(232,80,24,.06); }
.btn-light { background: #fff; color: var(--brand); }
.btn-light:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(0,0,0,.18); }
.btn-outline-light { border-color: rgba(255,255,255,.7); color: #fff; }
.btn-outline-light:hover { background: rgba(255,255,255,.14); border-color: #fff; }
.btn-sm { padding: 9px 22px; font-size: 13px; }
.btn-lg { padding: 16px 44px; font-size: 16px; }

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background .3s ease, box-shadow .3s ease;
  background: rgba(255,255,255,.72);
  backdrop-filter: blur(14px);
}
.nav.scrolled {
  background: rgba(255,255,255,.94);
  box-shadow: 0 2px 18px rgba(0,0,0,.06);
}
.nav-inner {
  max-width: 1280px; margin: 0 auto; padding: 0 32px;
  height: 76px;
  display: flex; align-items: center; justify-content: space-between;
}
.logo-img { height: 30px; width: auto; }
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a {
  font-size: 14px; color: var(--ink-2); transition: color .25s;
  position: relative;
}
.nav-links a:hover { color: var(--brand); }
.nav-links a:not(.btn)::after {
  content: ''; position: absolute; left: 0; bottom: -6px;
  width: 0; height: 2px; background: var(--brand); transition: width .3s;
}
.nav-links a:not(.btn):hover::after { width: 100%; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--brand); margin: 5px 0; transition: .3s; }

/* ---------- Hero（浅底） ---------- */
.hero {
  position: relative; min-height: 88vh;
  display: flex; align-items: center;
  overflow: hidden;
  background: #E6E2DC;
}
.hero-bg, .hero-bg img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
}
/* 加深头图：提高图像饱和度与对比，并叠加暖深色压低亮度 */
.hero-bg img { filter: saturate(1.35) contrast(1.18) brightness(.82); }
.hero-bg::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(31,31,31,.55) 0%, rgba(31,31,31,.38) 45%, rgba(31,31,31,.62) 100%);
  mix-blend-mode: multiply;
}
.hero-mask {
  position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(255,255,255,.94) 0%, rgba(255,255,255,.72) 38%, rgba(255,255,255,.12) 78%, rgba(255,255,255,0) 100%);
}
.hero-content { position: relative; z-index: 2; max-width: 1280px; margin: 0 auto; padding: 140px 32px 80px; width: 100%; }
.hero-eyebrow { font-size: 13px; color: var(--brand); letter-spacing: 5px; margin-bottom: 26px; font-weight: 600; }
.hero-title { font-size: clamp(38px, 5.2vw, 64px); font-weight: 800; line-height: 1.35; margin-bottom: 24px; color: var(--ink); }
.hero-title .brand, .brand-text {
  background: linear-gradient(135deg, var(--brand-light) 0%, var(--brand-deep) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub { font-size: 18px; color: var(--ink-2); line-height: 2; margin-bottom: 40px; }
.hero-actions { display: flex; gap: 18px; flex-wrap: wrap; margin-bottom: 72px; }
.hero-stats { display: flex; gap: 64px; flex-wrap: wrap; }
.stat strong { font-size: 34px; font-weight: 800; color: var(--brand); margin-right: 4px; }
.stat strong i { font-style: normal; font-size: 17px; }
.stat span { display: block; font-size: 13px; color: var(--gray); margin-top: 2px; }

/* ---------- 通用 Section ---------- */
.section { padding: 110px 0; background: var(--paper); }
/* 02 板块底色加深一档 */
.section-alt { background: #F0EDE8; }
.section-alt .pillar, .section-alt .cert-card, .section-alt .guar-card { box-shadow: 0 4px 16px rgba(0,0,0,.05); }
.section-works { background: #fff; }
.section-head { display: flex; align-items: flex-start; gap: 26px; margin-bottom: 56px; }
.sec-num {
  font-size: 58px; font-weight: 800; line-height: 1;
  background: linear-gradient(135deg, var(--brand-light) 0%, var(--brand-deep) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.section-head h2 { font-size: clamp(28px, 3vw, 38px); font-weight: 800; letter-spacing: 1px; color: var(--ink); }
.sec-en { font-size: 13px; color: var(--brand); letter-spacing: 5px; margin-top: 6px; }
.sec-intro { font-size: 16px; color: var(--gray); margin: 18px 0 48px; line-height: 2.1; }
.sec-intro .hl { color: var(--brand); font-weight: 700; }
.sub-head { font-size: 24px; font-weight: 700; margin: 70px 0 14px; color: var(--ink); }
.sub-head:first-of-type { margin-top: 0; }
.sub-head em { font-style: normal; color: var(--brand); }

/* ---------- 关于 ---------- */
.about-grid { display: grid; grid-template-columns: 1.25fr 1fr; gap: 56px; margin-bottom: 64px; }
.about-text p { font-size: 15.5px; color: var(--ink-2); margin-bottom: 20px; line-height: 2; }
.about-text strong { color: var(--ink); }
.about-text blockquote {
  border-left: 4px solid var(--brand);
  padding: 8px 0 8px 24px;
  font-size: 23px; font-weight: 700; color: var(--ink);
  margin: 30px 0; line-height: 1.7;
}
.about-text blockquote span { color: var(--brand); }
.about-text .muted { font-size: 14px; color: var(--gray); }
.about-cards { display: flex; flex-direction: column; gap: 18px; justify-content: center; }
.light-card {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--brand);
  border-radius: 12px;
  padding: 22px 28px;
  transition: transform .3s, box-shadow .3s;
}
.light-card:hover { transform: translateX(6px); box-shadow: var(--shadow); }
.dc-label { font-size: 12px; color: var(--brand); letter-spacing: 3px; margin-bottom: 6px; font-weight: 600; }
.dc-value { font-size: 17px; font-weight: 600; color: var(--ink); }

.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.pillar {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 34px 30px;
  transition: transform .3s, box-shadow .3s;
}
.pillar:hover { transform: translateY(-6px); box-shadow: var(--shadow-hi); }
.pillar-num { font-size: 30px; font-weight: 800; color: var(--brand); display: block; margin-bottom: 14px; }
.pillar h3 { font-size: 20px; margin-bottom: 10px; color: var(--ink); }
.pillar p { font-size: 13.5px; color: var(--gray); margin-bottom: 18px; line-height: 1.9; }
.pillar ul li {
  font-size: 13.5px; color: var(--ink-2); padding: 7px 0;
  border-top: 1px solid var(--line);
}
.pillar ul li::before { content: '· '; color: var(--brand); font-weight: 800; }

/* ---------- 价值 ---------- */
.cert-grid, .guar-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.cert-card, .guar-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 34px 30px;
  transition: transform .3s, box-shadow .3s;
}
.cert-card:hover, .guar-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hi); }
.cert-num { font-size: 40px; font-weight: 800; color: var(--brand); display: block; margin-bottom: 10px; }
.cert-card h4, .guar-card h4 { font-size: 20px; margin-bottom: 4px; color: var(--ink); }
.cert-tag { font-size: 13px; color: var(--brand); font-weight: 600; margin-bottom: 14px; }
.cert-card > p:not(.cert-tag):not(.cert-arrow), .guar-card > p { font-size: 13.5px; color: var(--gray); line-height: 1.9; margin-bottom: 18px; }
.cert-card ul li, .guar-card ul li {
  font-size: 13px; color: var(--ink-2); padding: 7px 0;
  border-top: 1px solid var(--line);
}
.cert-card ul li::before, .guar-card ul li::before { content: '✓ '; color: var(--brand); font-weight: 700; }
.cert-arrow {
  margin-top: 14px; padding-top: 12px;
  border-top: 1px dashed var(--line-brand);
  font-size: 12.5px !important; color: var(--brand) !important; font-weight: 600;
}
.guar-icon {
  width: 52px; height: 52px; border-radius: 14px;
  background: rgba(232,80,24,.1);
  color: var(--brand); font-weight: 800; font-size: 17px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
}

/* ---------- 服务 ---------- */
.svc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.svc-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 30px 32px;
  transition: transform .3s, box-shadow .3s;
  display: flex; flex-direction: column;
}
.svc-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hi); }
.svc-card-brand {
  background: linear-gradient(145deg, rgba(232,80,24,.07) 0%, rgba(232,80,24,.02) 100%);
  border-color: var(--line-brand);
}
.svc-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.svc-tag {
  background: linear-gradient(135deg, var(--brand-light) 0%, var(--brand-deep) 100%);
  color: #fff; font-size: 12px; font-weight: 700;
  padding: 4px 14px; border-radius: 4px;
}
.svc-mod { font-size: 11px; color: var(--gray-light); letter-spacing: 2px; }
.svc-card h4 { font-size: 21px; margin-bottom: 16px; color: var(--ink); }
.svc-card p { font-size: 13.5px; color: var(--ink-2); margin-bottom: 8px; line-height: 1.85; }
.svc-card p strong { color: var(--brand); font-weight: 600; }
.svc-fit {
  margin-top: auto; padding-top: 14px; font-size: 12.5px !important; color: var(--gray) !important;
  border-top: 1px solid var(--line);
}

/* ---------- 铁三角模型 ---------- */
.model { margin-top: 90px; }
.model-grid {
  display: grid; grid-template-columns: 1fr 1.1fr; gap: 40px; align-items: center;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 44px;
}
.model-triangle svg { width: 100%; height: auto; }
.model-points { display: flex; flex-direction: column; gap: 18px; }
.model-card {
  display: flex; gap: 16px; align-items: flex-start;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px 22px;
  transition: box-shadow .3s, border-color .3s;
}
.model-card:hover { box-shadow: var(--shadow); border-color: var(--line-brand); }
.model-num {
  flex-shrink: 0;
  width: 40px; height: 40px; border-radius: 50%;
  background: rgba(232,80,24,.1);
  color: var(--brand); font-size: 19px; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
}
.model-card h4 { font-size: 16px; margin-bottom: 6px; color: var(--ink); }
.model-card h4 em { font-style: normal; font-size: 12px; color: var(--brand); margin-left: 8px; letter-spacing: 1px; }
.model-card p { font-size: 13px; color: var(--gray); line-height: 1.85; }
.model-base { margin-top: 8px; font-size: 12px !important; color: var(--brand) !important; }

/* ---------- 作品（纯白底） ---------- */
.filter-bar { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 40px; }
.filter-btn {
  background: #fff; border: 1px solid var(--line);
  color: var(--ink-2); font-size: 13.5px; font-family: inherit;
  padding: 9px 24px; border-radius: 30px; cursor: pointer; transition: all .25s;
}
.filter-btn:hover { border-color: var(--brand); color: var(--brand); }
.filter-btn.active {
  background: linear-gradient(135deg, var(--brand-light) 0%, var(--brand-deep) 100%);
  border-color: transparent; color: #fff; font-weight: 600;
}
.works-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.work {
  background: #fff; border-radius: 12px; cursor: pointer;
  border: 1px solid var(--line); padding: 14px 14px 0;
  transition: transform .3s, box-shadow .3s, opacity .3s;
}
.work.hide { display: none; }
.work-img {
  background: #fff; aspect-ratio: 4 / 3; overflow: hidden;
  display: flex; align-items: center; justify-content: center;
}
.work-img img {
  width: 100%; height: 100%; object-fit: contain;
  transition: transform .5s ease;
}
.work:hover img { transform: scale(1.04); }
.work:hover { transform: translateY(-4px); box-shadow: var(--shadow-hi); }
.work figcaption { padding: 14px 4px 16px; }
.work figcaption strong { display: block; font-size: 15px; color: var(--ink); }
.work figcaption span { display: block; margin-top: 2px; font-size: 11.5px; color: var(--brand); letter-spacing: 1px; }
.works-note { margin-top: 44px; font-size: 13.5px; color: var(--gray); text-align: center; }

/* ---------- 联系（橙红品牌色带） ---------- */
.contact {
  position: relative; padding: 130px 0; overflow: hidden; text-align: center;
  background: linear-gradient(135deg, var(--brand-light) 0%, var(--brand-deep) 100%);
  color: #fff;
}
.contact-deco {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,.1) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.1) 1px, transparent 1px);
  background-size: 54px 54px;
  opacity: .5;
}
.contact-content { position: relative; z-index: 2; max-width: 860px; margin: 0 auto; padding: 0 32px; }
.contact-eyebrow { font-size: 13px; color: rgba(255,255,255,.85); letter-spacing: 5px; margin-bottom: 24px; }
.contact h2 { font-size: clamp(32px, 4vw, 48px); font-weight: 800; line-height: 1.5; margin-bottom: 20px; }
/* 橙红底上标题全部白色（含「增值」强调字） */
.contact .brand-text {
  background: none; -webkit-background-clip: initial; background-clip: initial;
  color: #fff; text-shadow: 0 2px 18px rgba(0,0,0,.12);
}
.contact-sub { font-size: 16px; color: rgba(255,255,255,.92); margin-bottom: 52px; }
.contact-cards { display: flex; justify-content: center; gap: 20px; flex-wrap: wrap; margin-bottom: 46px; }
.contact-card {
  background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.32); border-radius: 12px;
  padding: 18px 32px; min-width: 230px;
  backdrop-filter: blur(4px);
}
.contact-card span { display: block; font-size: 12px; color: rgba(255,255,255,.85); letter-spacing: 2px; margin-bottom: 6px; }
.contact-card strong { font-size: 15.5px; font-weight: 600; color: #fff; }
.contact-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ---------- Footer ---------- */
.footer {
  background: var(--paper-2);
  border-top: 1px solid var(--line);
  padding: 40px 32px; text-align: center;
  font-size: 12.5px; color: var(--gray); letter-spacing: 1px;
}
.footer-logo { height: 22px; width: auto; margin: 0 auto 14px; }
.footer-info { margin-top: 6px; color: var(--gray-light); }

/* ---------- Lightbox（浅底） ---------- */
.lightbox {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(255,255,255,.97);
  display: none; align-items: center; justify-content: center;
  flex-direction: column;
}
.lightbox.open { display: flex; }
.lightbox img {
  max-width: 86vw; max-height: 78vh; object-fit: contain;
  border-radius: 8px; box-shadow: 0 20px 60px rgba(0,0,0,.18);
  background: #fff;
}
.lb-close {
  position: absolute; top: 26px; right: 38px;
  background: none; border: none; color: var(--brand);
  font-size: 44px; cursor: pointer; line-height: 1;
}
.lb-prev, .lb-next {
  position: absolute; top: 50%; transform: translateY(-50%);
  background: #fff; border: 1px solid var(--line);
  color: var(--brand); font-size: 34px; cursor: pointer;
  width: 54px; height: 54px; border-radius: 50%;
  transition: background .25s;
  box-shadow: var(--shadow);
}
.lb-prev:hover, .lb-next:hover { background: rgba(232,80,24,.1); }
.lb-prev { left: 30px; }
.lb-next { right: 30px; }
.lb-caption { margin-top: 18px; color: var(--ink-2); font-size: 14px; }

/* ---------- 滚动浮现 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .pillars, .cert-grid, .guar-grid { grid-template-columns: 1fr 1fr; }
  .works-grid { grid-template-columns: 1fr 1fr; }
  .svc-grid { grid-template-columns: 1fr; }
  .model-grid { grid-template-columns: 1fr; padding: 30px; }
}
@media (max-width: 680px) {
  .nav-links {
    position: fixed; top: 76px; right: 0; width: 240px;
    flex-direction: column; align-items: flex-start; gap: 8px;
    background: rgba(255,255,255,.98); padding: 24px 28px;
    border-left: 1px solid var(--line);
    box-shadow: var(--shadow);
    transform: translateX(100%); transition: transform .3s;
  }
  .nav-links.open { transform: none; }
  .nav-toggle { display: block; }
  .pillars, .cert-grid, .guar-grid { grid-template-columns: 1fr; }
  .works-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 32px; }
  .section { padding: 80px 0; }
  .contact-cards { flex-direction: column; align-items: center; }
  .lb-prev, .lb-next { display: none; }
  .logo-img { height: 24px; }
}

/* ---------- 语言切换（中英共用） ---------- */
.lang-switch {
  font-size: 13px !important;
  letter-spacing: .06em;
  color: var(--gray) !important;
  border: 1px solid var(--line);
  border-radius: 30px;
  padding: 5px 14px;
  line-height: 1.4;
  transition: color .25s, border-color .25s;
}
.lang-switch:hover { color: var(--brand) !important; border-color: var(--line-brand); }
.lang-switch::after { display: none !important; }

/* ---------- 导航 CTA：背景同为品牌橙红渐变，文字统一白色 ---------- */
.nav .nav-links a.btn-brand,
.nav .nav-links a.btn-brand:hover { color: #fff; }
.nav .nav-links a.btn-brand:hover { box-shadow: 0 12px 28px rgba(232,80,24,.32); }