/* ==========================================================
   智码耘科技 · 公司门户首页样式
   色系沿用一茶通 Design Tokens（见 C:\tea\docs\design\UI原型图.md 第0章）
   字体：正文思源黑体 / 标题思源宋体（OFL，上线时打包 woff2 子集，
   草稿阶段回退系统字体）
   ========================================================== */

:root {
  --green:   #2E7D5F;
  --green-d: #1F5A43;
  --green-l: #5BA683;
  --accent:  #C77B3F;
  --ink:     #1F2A24;
  --ink-2:   #5A6661;
  --ink-3:   #94A29C;
  --bg:      #F7F6F2;
  --surface: #FFFFFF;
  --line:    #E5E4DD;
  --success: #3D9A6B;
  --warn:    #E0A042;
  --footer:  #10291F;

  --font-body: "Source Han Sans SC", "思源黑体", "Noto Sans SC",
               "PingFang SC", "Microsoft YaHei", "微软雅黑", sans-serif;
  --font-display: "Source Han Serif SC", "思源宋体", "Noto Serif SC",
                  "Source Han Serif CN", "STZhongsong", "华文中宋", "SimSun", serif;

  --radius: 14px;
  --shadow: 0 12px 32px rgba(31, 42, 36, 0.08);
  --wrap: 1120px;
}

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

html { scroll-behavior: smooth; }

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

img, svg { display: block; }

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

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

section { scroll-margin-top: 72px; }

.section { padding: 96px 0; }
.section-alt { background: var(--surface); }

/* ============ 按钮 ============ */
.btn {
  display: inline-block;
  padding: 13px 30px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-accent {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 6px 18px rgba(199, 123, 63, 0.35);
}
.btn-accent:hover { background: #B56D33; }
.btn-ghost {
  border: 1px solid rgba(255, 255, 255, 0.55);
  color: #fff;
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.1); }
.btn-sm { padding: 8px 20px; font-size: 14px; }

/* ============ 顶部导航 ============ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(247, 246, 242, 0.88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.brand-mark { width: 32px; height: 32px; }
.brand-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 2px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
  font-size: 15px;
  color: var(--ink-2);
}
.nav-links a:not(.btn):hover { color: var(--green); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
}

/* ============ 第一屏：一茶通 ============ */
.hero {
  position: relative;
  overflow: hidden;
  color: #fff;
  background: linear-gradient(158deg, #1F5A43 0%, #2E7D5F 58%, #3B8A6B 100%);
}
.hero-media {
  position: absolute;
  inset: 0;
  background: url("../img/hero-bg.jpg") center / cover no-repeat;
  opacity: 0.28;
  mix-blend-mode: luminosity;
}
.hero-hills {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 46%;
  pointer-events: none;
}
.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
  padding-top: 96px;
  padding-bottom: 128px;
}
.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  font-size: 13px;
  letter-spacing: 1px;
  color: rgba(255, 255, 255, 0.92);
  margin-bottom: 26px;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(34px, 4.6vw, 52px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 1px;
  margin-bottom: 22px;
}
.hero-sub {
  font-size: 17px;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.85);
  max-width: 30em;
  margin-bottom: 36px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ---- 手机示意图 ---- */
.hero-phone-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.phone {
  width: 296px;
  background: #142E24;
  border-radius: 44px;
  padding: 10px;
  box-shadow: 0 30px 60px rgba(9, 26, 19, 0.45);
}
.phone-screen {
  background: var(--bg);
  border-radius: 35px;
  overflow: hidden;
}
.app-head {
  background: linear-gradient(135deg, var(--green-d), var(--green));
  color: #fff;
  padding: 26px 18px 16px;
}
.app-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 2px;
}
.app-sub { font-size: 12px; opacity: .85; margin-top: 2px; }
.app-body { padding: 14px 14px 18px; display: grid; gap: 9px; }
.app-progress {
  background: var(--surface);
  border-radius: 12px;
  padding: 10px 12px;
  box-shadow: 0 2px 8px rgba(31, 42, 36, 0.05);
}
.app-progress-text {
  display: flex;
  justify-content: space-between;
  font-size: 11.5px;
  color: var(--ink-2);
  margin-bottom: 6px;
}
.app-progress-text b { color: var(--success); }
.app-progress-bar {
  height: 6px;
  border-radius: 999px;
  background: #ECEEE7;
  overflow: hidden;
}
.app-progress-bar i {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--green-l), var(--success));
}
.app-task {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--surface);
  border-radius: 12px;
  padding: 9px 12px;
  font-size: 12px;
  box-shadow: 0 2px 8px rgba(31, 42, 36, 0.05);
}
.t-date {
  flex: none;
  font-size: 10.5px;
  color: var(--green);
  background: #EAF3EE;
  border-radius: 6px;
  padding: 2px 7px;
}
.t-name { flex: 1; color: var(--ink); }
.t-pill {
  flex: none;
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 999px;
}
.t-pill.done  { color: var(--success); background: #E7F4EC; }
.t-pill.doing { color: #B56D33; background: #FBF1E6; }
.t-pill.todo  { color: #7A8781; background: #EFF0EB; }
.app-qa {
  background: var(--surface);
  border-radius: 12px;
  padding: 11px 12px;
  box-shadow: 0 2px 8px rgba(31, 42, 36, 0.05);
  font-size: 11.5px;
}
.qa-q { color: var(--ink); font-weight: 600; margin-bottom: 4px; }
.qa-a { color: var(--ink-2); line-height: 1.6; }
.qa-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 8px;
}
.qa-src { font-size: 10px; color: var(--green); }
.qa-btn {
  font-size: 10px;
  color: #fff;
  background: var(--green);
  border-radius: 999px;
  padding: 3px 10px;
}
.phone-caption {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.6);
  letter-spacing: 1px;
}

/* ============ 通用小节头 ============ */
.sec-head { text-align: center; margin-bottom: 56px; }
.sec-head h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 700;
  letter-spacing: 1px;
  margin-bottom: 12px;
}
.sec-head p { color: var(--ink-2); font-size: 16px; }

/* ============ 第二屏：核心能力 ============ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.feature-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 26px;
  transition: transform .2s ease, box-shadow .2s ease;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.f-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: #EAF3EE;
  color: var(--green);
  display: grid;
  place-items: center;
  margin-bottom: 18px;
}
.f-icon svg { width: 26px; height: 26px; }
.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}
.feature-card p {
  font-size: 14.5px;
  color: var(--ink-2);
  line-height: 1.8;
}

/* ============ 第三屏：旗下业务 ============ */
.biz-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.biz-card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform .2s ease, box-shadow .2s ease;
}
.biz-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.biz-media { aspect-ratio: 16 / 9; background-position: center; background-size: cover; }
.biz-media--tea { background-color: #EAF3EE; background-image: url("../img/biz-songcha.jpg"); }
.biz-media--edu { background-color: #F2EFE6; background-image: url("../img/biz-workbench.jpg"); }
.biz-media--edu2 { background-color: #E9EEF0; background-image: url("../img/biz-edu.jpg"); }
.biz-body { padding: 22px 24px 26px; }
.biz-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}
.biz-body h3 { font-size: 18px; font-weight: 700; }
.badge {
  font-size: 12px;
  padding: 3px 12px;
  border-radius: 999px;
}
.badge-on  { color: var(--success); background: #E7F4EC; }
.badge-dev { color: #B56D33; background: #FBF1E6; }
.biz-body p { font-size: 14.5px; color: var(--ink-2); }

/* ============ 第四屏：关于我们 ============ */
.about-inner { max-width: 760px; margin: 0 auto; }
.about-inner .sec-head { margin-bottom: 28px; }
.about-name {
  text-align: center;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 18px;
}
.about-text {
  text-align: center;
  color: var(--ink-2);
  font-size: 16px;
  line-height: 2;
  margin-bottom: 30px;
}
.about-tags {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}
.tag {
  font-size: 13px;
  color: var(--green);
  background: #EAF3EE;
  border: 1px solid #D5E6DC;
  border-radius: 999px;
  padding: 6px 16px;
}

/* ============ 联系我们 ============ */
.contact { padding-bottom: 110px; }
.contact-panel {
  background: linear-gradient(158deg, var(--green-d), var(--green));
  border-radius: 22px;
  color: #fff;
  padding: 64px 56px;
  box-shadow: 0 20px 50px rgba(31, 90, 67, 0.28);
}
.contact-panel h2 {
  font-family: var(--font-display);
  font-size: clamp(24px, 2.8vw, 32px);
  font-weight: 700;
  letter-spacing: 1px;
  margin-bottom: 12px;
}
.contact-lead {
  color: rgba(255, 255, 255, 0.82);
  margin-bottom: 38px;
}
.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.contact-item {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius);
  padding: 20px;
}
.c-label {
  display: block;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.65);
  margin-bottom: 6px;
}
.c-value { font-size: 16px; font-weight: 600; }
.c-value.todo {
  font-weight: 400;
  color: rgba(255, 255, 255, 0.75);
  border-bottom: 1px dashed rgba(255, 255, 255, 0.45);
}

/* ============ 页脚 ============ */
.footer {
  background: var(--footer);
  color: rgba(255, 255, 255, 0.6);
  padding: 30px 0;
  font-size: 13.5px;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.icp a { font-size: 12.5px; color: rgba(255, 255, 255, 0.5); }
.icp a:hover { color: rgba(255, 255, 255, 0.85); }

/* ============ 响应式 ============ */
@media (max-width: 960px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 48px;
    padding-top: 72px;
    padding-bottom: 96px;
    text-align: center;
  }
  .hero-sub { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .biz-grid { grid-template-columns: 1fr; max-width: 460px; margin: 0 auto; }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .section { padding: 64px 0; }
  .nav-links {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    display: none;
    padding: 8px 24px 16px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 0; }
  .nav-links .btn { margin-top: 8px; text-align: center; }
  .nav-toggle { display: flex; }
  .feature-grid { grid-template-columns: 1fr; }
  .contact-panel { padding: 44px 28px; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-inner { justify-content: center; text-align: center; }
}

/* ============ 整屏节奏 + 滚动渐入（参考颂茶官网的滑动观感） ============ */

/* 首屏占满一屏，内容垂直居中 */
.hero {
  min-height: calc(100vh - 64px);
  display: flex;
  align-items: center;
}

/* 其余各段接近整屏，滚动时一屏一屏滑过 */
.section-screen {
  min-height: 92vh;
  display: flex;
  align-items: center;
}
.section-screen > .wrap { width: 100%; }

/* 滚动渐入：进入视口后上浮淡入，.d1~.d4 做先后层次（仅 JS 可用时才隐藏初始态） */
html.js .rv {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .7s cubic-bezier(.22, .61, .36, 1),
              transform .7s cubic-bezier(.22, .61, .36, 1);
  will-change: opacity, transform;
}
html.js .rv.in { opacity: 1; transform: none; }
.d1 { transition-delay: .08s; }
.d2 { transition-delay: .16s; }
.d3 { transition-delay: .26s; }
.d4 { transition-delay: .36s; }

@media (prefers-reduced-motion: reduce) {
  .rv { opacity: 1; transform: none; transition: none; }
  .scroll-hint { display: none; }
}

/* 首屏底部的滑动提示 */
.scroll-hint {
  position: absolute;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%);
  z-index: 2;
  padding: 6px;
}
.scroll-hint-track {
  display: block;
  width: 24px;
  height: 38px;
  border: 2px solid rgba(255, 255, 255, 0.55);
  border-radius: 14px;
  position: relative;
}
.scroll-hint-dot {
  position: absolute;
  left: 50%;
  top: 7px;
  width: 4px;
  height: 8px;
  margin-left: -2px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.85);
  animation: hint-drop 1.8s ease-in-out infinite;
}
@keyframes hint-drop {
  0%   { transform: translateY(0);    opacity: 1; }
  70%  { transform: translateY(13px); opacity: 0; }
  100% { transform: translateY(0);    opacity: 0; }
}

/* 段落编号（颂茶站式的章节标记） */
.sec-index {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 4px;
  color: var(--green);
  margin-bottom: 14px;
}
.sec-index-light { color: rgba(255, 255, 255, 0.7); }

.btn-ghost .arrow { margin-left: 8px; }