/* ==========================================================================
   长沙勤思问教育科技有限公司 - 企业官网样式
   简约现代商务风格 · 深蓝 + 浅灰 · 无外部依赖
   ========================================================================== */

:root {
  --primary: #16324f;
  --primary-600: #1e4570;
  --primary-700: #10263c;
  --accent: #2f6fb0;
  --accent-600: #24598f;
  --accent-soft: #e9f1f9;
  --ink: #27313c;
  --ink-2: #5c6773;
  --ink-3: #8a95a1;
  --bg: #ffffff;
  --bg-soft: #f5f7fa;
  --line: #e4e9ef;
  --ok: #2e7d5b;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 2px rgba(22, 50, 79, 0.05), 0 6px 18px rgba(22, 50, 79, 0.06);
  --shadow-md: 0 2px 4px rgba(22, 50, 79, 0.05), 0 14px 34px rgba(22, 50, 79, 0.10);
  --container: 1200px;
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC",
    system-ui, -apple-system, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

img,
svg {
  vertical-align: middle;
}

a {
  color: var(--accent-600);
  text-decoration: none;
}

a:hover {
  color: var(--accent);
}

h1,
h2,
h3,
h4,
p,
ul,
ol,
figure {
  margin-top: 0;
}

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

h1,
h2,
h3,
h4 {
  color: var(--primary);
  line-height: 1.35;
  font-weight: 700;
}

::selection {
  background: rgba(47, 111, 176, 0.18);
}

:focus-visible {
  outline: 3px solid rgba(47, 111, 176, 0.45);
  outline-offset: 2px;
}

[id] {
  scroll-margin-top: 92px;
}

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

.section {
  padding: 78px 0;
}

.section--soft {
  background: var(--bg-soft);
}

.section--tight {
  padding: 56px 0;
}

.section-head {
  max-width: 760px;
  margin-bottom: 44px;
}

.section-head--center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.section-head .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  color: var(--accent-600);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.section-head .eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--accent);
}

.section-head--center .eyebrow::after {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--accent);
}

.section-head h2 {
  margin-bottom: 12px;
  font-size: 32px;
}

.section-head p {
  margin-bottom: 0;
  color: var(--ink-2);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 11px 26px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease,
    box-shadow 0.18s ease, transform 0.18s ease;
}

.btn svg {
  width: 17px;
  height: 17px;
}

.btn--primary {
  background: var(--primary);
  color: #fff;
}

.btn--primary:hover {
  background: var(--primary-600);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn--outline {
  background: transparent;
  border-color: #c6d2de;
  color: var(--primary);
}

.btn--outline:hover {
  border-color: var(--accent);
  color: var(--accent-600);
  transform: translateY(-1px);
}

.btn--light {
  background: #fff;
  color: var(--primary);
}

.btn--light:hover {
  background: var(--accent-soft);
  color: var(--primary);
  transform: translateY(-1px);
}

.btn--outline-light {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.55);
  color: #fff;
}

.btn--outline-light:hover {
  border-color: #fff;
  color: #fff;
  transform: translateY(-1px);
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(255, 255, 255, 0.97);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 74px;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--primary);
}

.brand:hover {
  color: var(--primary);
}

.brand-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-600));
  color: #fff;
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-name {
  font-size: 19px;
  font-weight: 700;
}

.brand-sub {
  margin-top: 4px;
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--ink-3);
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 6px;
}

.site-nav a {
  display: block;
  padding: 9px 15px;
  border-radius: 8px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 500;
  transition: color 0.15s ease, background-color 0.15s ease;
}

.site-nav a:hover {
  color: var(--accent-600);
  background: var(--bg-soft);
}

.site-nav a.active {
  color: var(--accent-600);
  background: var(--accent-soft);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: #fff;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--primary);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.is-open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- 首页 Hero ---------- */
.hero {
  position: relative;
  padding: 78px 0 86px;
  background:
    radial-gradient(700px 380px at 88% 12%, rgba(47, 111, 176, 0.10), transparent 62%),
    linear-gradient(180deg, #f3f7fb 0%, #eef3f9 100%);
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 56px;
  align-items: center;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  padding: 7px 14px;
  border: 1px solid #d4e0ec;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.75);
  color: var(--primary-600);
  font-size: 13.5px;
  font-weight: 600;
}

.hero-eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

.hero h1 {
  margin-bottom: 20px;
  font-size: 44px;
  letter-spacing: 0.01em;
}

.hero-lead {
  max-width: 560px;
  margin-bottom: 32px;
  color: var(--ink-2);
  font-size: 17px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 34px;
}

.hero-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
}

.hero-trust li {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--ink-2);
  font-size: 14px;
}

.hero-trust svg {
  width: 16px;
  height: 16px;
  color: var(--ok);
}

.hero-visual {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.hv-card {
  padding: 24px 26px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  box-shadow: var(--shadow-md);
}

.hv-title {
  margin-bottom: 14px;
  color: var(--primary);
  font-size: 15px;
  font-weight: 700;
}

.hv-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 18px;
}

.hv-list li {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--ink);
  font-size: 14.5px;
}

.hv-list .dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
}

.hv-mode {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 0;
  color: var(--ink);
  font-size: 14.5px;
}

.hv-mode + .hv-mode {
  border-top: 1px dashed var(--line);
}

.hv-mode-tag {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 46px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-600);
  font-size: 12.5px;
  font-weight: 700;
}

/* ---------- 卡片网格 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 20px;
}

.card-grid--3 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.card {
  display: flex;
  flex-direction: column;
  padding: 28px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-sm);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.card:hover {
  transform: translateY(-3px);
  border-color: #c9d8e8;
  box-shadow: var(--shadow-md);
}

.icon-chip {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  margin-bottom: 18px;
  border-radius: 11px;
  background: var(--accent-soft);
  color: var(--accent-600);
}

.icon-chip svg {
  width: 24px;
  height: 24px;
}

.card h3 {
  margin-bottom: 9px;
  font-size: 18px;
}

.card p {
  margin-bottom: 0;
  color: var(--ink-2);
  font-size: 14.5px;
}

.card .card-link {
  margin-top: auto;
  padding-top: 16px;
  font-size: 14px;
  font-weight: 600;
}

.card .card-link svg {
  width: 14px;
  height: 14px;
  vertical-align: -2px;
}

/* ---------- 列表勾选 ---------- */
.checks li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 10px;
  color: var(--ink-2);
  font-size: 14.5px;
}

.checks li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 1px;
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-600);
  font-size: 11px;
  font-weight: 700;
}

.checks li:last-child {
  margin-bottom: 0;
}

/* ---------- 课程卡片 ---------- */
.course-card {
  display: flex;
  flex-direction: column;
  padding: 30px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-sm);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.course-card:hover {
  transform: translateY(-3px);
  border-color: #c9d8e8;
  box-shadow: var(--shadow-md);
}

.course-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 16px;
}

.course-tag {
  flex: none;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-600);
  font-size: 12.5px;
  font-weight: 700;
}

.course-card h3 {
  margin-bottom: 10px;
  font-size: 19px;
}

.course-card .course-desc {
  margin-bottom: 16px;
  color: var(--ink-2);
  font-size: 14.5px;
}

.course-card .checks {
  margin-bottom: 18px;
}

.course-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
  color: var(--ink-2);
  font-size: 13.5px;
}

.course-meta strong {
  display: block;
  color: var(--ink);
  font-size: 13px;
}

/* ---------- 产品卡片 ---------- */
.product-card {
  display: flex;
  flex-direction: column;
  padding: 30px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-sm);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.product-card:hover {
  transform: translateY(-3px);
  border-color: #c9d8e8;
  box-shadow: var(--shadow-md);
}

.product-card h3 {
  margin-bottom: 10px;
  font-size: 18px;
}

.product-card p {
  margin-bottom: 14px;
  color: var(--ink-2);
  font-size: 14.5px;
}

.product-card .checks {
  margin-top: auto;
}

.product-tag {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  margin-bottom: 16px;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-600);
  font-size: 12.5px;
  font-weight: 700;
}

/* ---------- 业务详情块 ---------- */
.service-block {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 36px;
  margin-bottom: 22px;
  padding: 34px 36px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-sm);
}

.service-block:last-child {
  margin-bottom: 0;
}

.service-side .icon-chip {
  width: 56px;
  height: 56px;
}

.service-side h3 {
  margin: 16px 0 8px;
  font-size: 21px;
}

.service-side .service-tagline {
  margin-bottom: 14px;
  color: var(--ink-2);
  font-size: 14.5px;
}

.service-side .service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.service-side .service-tags span {
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  color: var(--ink-2);
  font-size: 12.5px;
}

.service-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 26px;
  align-content: start;
}

.service-cols h4 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-size: 15px;
}

.service-cols h4 svg {
  width: 17px;
  height: 17px;
  color: var(--accent);
}

/* ---------- 流程步骤 ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  counter-reset: step;
}

.step {
  position: relative;
  padding: 28px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-sm);
}

.step-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-bottom: 16px;
  border-radius: 10px;
  background: var(--primary);
  color: #fff;
  font-size: 17px;
  font-weight: 700;
}

.step h3 {
  margin-bottom: 8px;
  font-size: 16.5px;
}

.step p {
  margin-bottom: 0;
  color: var(--ink-2);
  font-size: 14px;
}

/* ---------- CTA 横幅 ---------- */
.cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding: 48px 52px;
  border-radius: 16px;
  background:
    radial-gradient(560px 260px at 92% 10%, rgba(255, 255, 255, 0.08), transparent 60%),
    linear-gradient(120deg, var(--primary) 0%, var(--primary-600) 100%);
  color: #fff;
  box-shadow: var(--shadow-md);
}

.cta h2 {
  margin-bottom: 10px;
  color: #fff;
  font-size: 26px;
}

.cta p {
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.82);
  font-size: 15px;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  flex: none;
}

/* ---------- 内页页头 ---------- */
.page-head {
  padding: 58px 0 52px;
  background:
    radial-gradient(600px 300px at 90% 0%, rgba(47, 111, 176, 0.10), transparent 60%),
    linear-gradient(180deg, #f3f7fb 0%, #eef3f9 100%);
  border-bottom: 1px solid var(--line);
}

.breadcrumb {
  margin-bottom: 18px;
  color: var(--ink-3);
  font-size: 13.5px;
}

.breadcrumb a {
  color: var(--ink-3);
}

.breadcrumb a:hover {
  color: var(--accent-600);
}

.breadcrumb .sep {
  margin: 0 8px;
  color: #b9c3cd;
}

.page-head h1 {
  margin-bottom: 12px;
  font-size: 36px;
}

.page-head p {
  max-width: 720px;
  margin-bottom: 0;
  color: var(--ink-2);
  font-size: 16px;
}

/* ---------- 锚点导航（业务总览） ---------- */
.anchor-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.anchor-nav a {
  padding: 8px 16px;
  border: 1px solid #d5dfe9;
  border-radius: 999px;
  background: #fff;
  color: var(--primary);
  font-size: 14px;
  font-weight: 600;
  transition: border-color 0.15s ease, background-color 0.15s ease, color 0.15s ease;
}

.anchor-nav a:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent-600);
}

/* ---------- 关于：品牌释义 / 双线架构 ---------- */
.split {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 44px;
  align-items: start;
}

.split h2 {
  margin-bottom: 16px;
  font-size: 28px;
}

.split p {
  color: var(--ink-2);
}

.word-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.word-card-head {
  padding: 20px 26px;
  background: var(--primary);
  color: #fff;
}

.word-card-head h3 {
  margin-bottom: 2px;
  color: #fff;
  font-size: 20px;
}

.word-card-head p {
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: 13px;
}

.word-list {
  padding: 14px 26px 20px;
}

.word-list li {
  display: grid;
  grid-template-columns: 62px 1fr;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px dashed var(--line);
}

.word-list li:last-child {
  border-bottom: 0;
}

.word-list .char {
  color: var(--accent-600);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.2;
}

.word-list .word {
  color: var(--ink);
  font-size: 14.5px;
  font-weight: 600;
}

.word-list .explain {
  color: var(--ink-2);
  font-size: 13.5px;
}

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

.duo-card {
  padding: 30px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-sm);
}

.duo-card h3 {
  margin-bottom: 10px;
  font-size: 19px;
}

.duo-card > p {
  margin-bottom: 16px;
  color: var(--ink-2);
  font-size: 14.5px;
}

/* ---------- 合作模式 ---------- */
.mode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.mode-card {
  padding: 34px 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-sm);
}

.mode-card--dark {
  background: linear-gradient(135deg, var(--primary), var(--primary-600));
  border-color: var(--primary);
  color: #fff;
}

.mode-card--dark h3 {
  color: #fff;
}

.mode-card h3 {
  margin-bottom: 12px;
  font-size: 20px;
}

.mode-card p {
  margin-bottom: 16px;
  color: var(--ink-2);
  font-size: 14.5px;
}

.mode-card--dark p {
  color: rgba(255, 255, 255, 0.82);
}

/* ---------- 联系页 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 44px;
  align-items: start;
}

.info-card-list {
  display: grid;
  gap: 14px;
}

.info-card {
  display: flex;
  gap: 16px;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-sm);
}

.info-card .icon-chip {
  flex: none;
  width: 46px;
  height: 46px;
  margin-bottom: 0;
}

.info-card .icon-chip svg {
  width: 21px;
  height: 21px;
}

.info-card h3 {
  margin-bottom: 3px;
  font-size: 15px;
}

.info-card p {
  margin-bottom: 0;
  color: var(--ink-2);
  font-size: 14px;
  word-break: break-all;
}

.form-panel {
  padding: 34px 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-sm);
}

.form-panel h2 {
  margin-bottom: 8px;
  font-size: 22px;
}

.form-panel .form-hint {
  margin-bottom: 24px;
  color: var(--ink-2);
  font-size: 14px;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-item {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.form-item--full {
  grid-column: 1 / -1;
}

.form-item label {
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
}

.form-item label .req {
  color: #c0492f;
}

.form-item input,
.form-item select,
.form-item textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--ink);
  font-family: inherit;
  font-size: 14.5px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-item textarea {
  min-height: 120px;
  resize: vertical;
}

.form-item input:focus,
.form-item select:focus,
.form-item textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(47, 111, 176, 0.14);
}

.form-item select {
  appearance: auto;
}

.form-note {
  grid-column: 1 / -1;
  margin-bottom: 0;
  color: var(--ink-3);
  font-size: 13px;
}

.form-success {
  margin-top: 16px;
  padding: 14px 16px;
  border: 1px solid #bfe0cf;
  border-radius: var(--radius-sm);
  background: #eaf7f0;
  color: var(--ok);
  font-size: 14px;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--primary-700);
  color: rgba(255, 255, 255, 0.72);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 0.9fr 1.1fr 1.2fr;
  gap: 40px;
  padding: 56px 24px 44px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.footer-brand .brand-mark {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.footer-brand .brand-name {
  color: #fff;
}

.footer-brand .brand-sub {
  color: rgba(255, 255, 255, 0.5);
}

.footer-about p {
  margin-bottom: 0;
  font-size: 14px;
  line-height: 1.8;
}

.footer-col h3 {
  margin-bottom: 18px;
  color: #fff;
  font-size: 15px;
}

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
  transition: color 0.15s ease;
}

.footer-col a:hover {
  color: #fff;
}

.footer-contact li {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
  font-size: 14px;
}

.footer-contact svg {
  flex: none;
  width: 17px;
  height: 17px;
  margin-top: 4px;
  color: rgba(255, 255, 255, 0.45);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 18px 0;
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  color: rgba(255, 255, 255, 0.5);
  font-size: 13px;
}

.footer-bottom p {
  margin-bottom: 0;
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.5);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-bottom a:hover {
  color: #fff;
}

/* ---------- 响应式 ---------- */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-visual {
    max-width: 560px;
  }

  .service-block {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .service-side {
    display: grid;
    grid-template-columns: auto 1fr;
    column-gap: 20px;
    align-items: center;
  }

  .service-side .icon-chip {
    grid-row: 1 / 3;
    margin-bottom: 0;
  }

  .service-side h3 {
    margin: 0 0 2px;
  }

  .service-side .service-tagline {
    margin-bottom: 0;
  }

  .service-side .service-tags {
    grid-column: 1 / -1;
    margin-top: 14px;
  }

  .split,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

@media (max-width: 768px) {
  .section {
    padding: 58px 0;
  }

  .section-head h2 {
    font-size: 27px;
  }

  .hero {
    padding: 52px 0 60px;
  }

  .hero h1 {
    font-size: 34px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    padding: 14px 24px 22px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-md);
  }

  .site-nav.is-open {
    display: block;
  }

  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .site-nav a {
    padding: 12px 14px;
  }

  .duo-grid,
  .mode-grid {
    grid-template-columns: 1fr;
  }

  .cta {
    flex-direction: column;
    align-items: flex-start;
    padding: 36px 30px;
  }

  .page-head {
    padding: 44px 0 40px;
  }

  .page-head h1 {
    font-size: 30px;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    padding-top: 44px;
  }
}

@media (max-width: 560px) {
  .container {
    padding: 0 18px;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .hv-list {
    grid-template-columns: 1fr;
  }

  .course-meta {
    grid-template-columns: 1fr;
  }

  .service-block {
    padding: 26px 22px;
  }

  .cta {
    padding: 30px 24px;
  }

  .form-panel {
    padding: 26px 22px;
  }

  .brand-sub {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}