/* 钉钉官网-最终版-v123 样式表
 * 风格：邮筒投口｜骨架：投口+班次+取信+页脚
 * 配色：邮筒投口深红#992B24 + 邮筒投口辅浅琥珀#EBE5D6
 * 辅助色：深红铸铁#5E1712、黄铜金#C99700、炭黑#1C1817、浅琥珀衬底#F7F4EC、投口白#FFFFFF
 * 背景：邮筒红漆（带有轻微铸铁质感、投口横向拉丝与深红漆防锈光泽）
 * 字体：更纱黑体 + Instrument Serif / 系统无衬线
 */

:root {
  --color-primary: #992B24;        /* 邮筒投口深红 */
  --color-secondary: #EBE5D6;      /* 邮筒投口辅浅琥珀 */
  --color-dark-iron: #5E1712;      /* 深红铸铁色 */
  --color-brass: #C99700;          /* 金属黄铜色 */
  --color-text-main: #1C1817;      /* 炭黑正文 */
  --color-text-muted: #6B5E59;     /* 氧化红棕文字 */
  --color-bg-base: #F7F4EC;        /* 浅琥珀纸底 */
  --color-card-bg: #FFFFFF;        /* 纯白卡片 */
  --color-border: #D8CEBC;         /* 投口框浅金属边框 */
  --color-border-dark: #7A221C;    /* 深红边框 */
  --font-serif: "Instrument Serif", Georgia, "Source Han Serif CN", serif;
  --font-sans: "Sarasa Gothic SC", "Sarasa Gothic", "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --radius-slot: 12px;
  --shadow-chute: 0 4px 20px rgba(94, 23, 18, 0.12);
  --shadow-inset: inset 0 2px 6px rgba(0, 0, 0, 0.2);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg-base);
  color: var(--color-text-main);
  line-height: 1.65;
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(153, 43, 36, 0.04) 0%, transparent 60%),
    linear-gradient(rgba(153, 43, 36, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(153, 43, 36, 0.02) 1px, transparent 1px);
  background-size: 100% 100%, 32px 32px, 32px 32px;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.25s ease;
}

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

.w {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 顶部 SEO 极小字条 */
.top-seo-bar {
  background: var(--color-dark-iron);
  color: var(--color-secondary);
  font-size: 12px;
  padding: 6px 0;
  border-bottom: 1px solid rgba(235, 229, 214, 0.15);
}
.top-seo-bar .kw-items {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}
.top-seo-bar .kw-items span {
  opacity: 0.8;
}
.top-seo-bar .kw-items a {
  color: var(--color-secondary);
  opacity: 0.9;
  border-bottom: 1px dotted rgba(235, 229, 214, 0.4);
}
.top-seo-bar .kw-items a:hover {
  opacity: 1;
  color: #FFFFFF;
  border-bottom-color: #FFFFFF;
}

/* 顶部吸顶导航栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(247, 244, 236, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 2px solid var(--color-primary);
  box-shadow: 0 2px 10px rgba(94, 23, 18, 0.06);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand-slot {
  display: flex;
  align-items: center;
  gap: 14px;
}
.brand-logo-wrap {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px;
  border: 1px solid var(--color-brass);
}
.brand-titles {
  display: flex;
  flex-direction: column;
}
.brand-titles .main-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.5px;
}
.brand-titles .sub-tag {
  font-size: 11px;
  color: var(--color-text-muted);
  background: var(--color-secondary);
  padding: 1px 6px;
  border-radius: 4px;
  display: inline-block;
  width: fit-content;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}
.nav-links a {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text-main);
  position: relative;
  padding: 6px 0;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--color-primary);
}
.nav-links a.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}
.btn-login {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  padding: 8px 18px;
  border: 1px solid var(--color-primary);
  border-radius: 6px;
  background: transparent;
}
.btn-login:hover {
  background: rgba(153, 43, 36, 0.06);
}
.btn-cta-slot {
  font-size: 14px;
  font-weight: 700;
  color: #FFFFFF;
  background: var(--color-primary);
  padding: 9px 20px;
  border-radius: 6px;
  border: 1px solid var(--color-dark-iron);
  box-shadow: 0 2px 6px rgba(153, 43, 36, 0.25);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn-cta-slot:hover {
  background: var(--color-dark-iron);
  transform: translateY(-1px);
}

/* 投口横幅标牌（Slot Plaque） */
.slot-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  padding: 6px 14px;
  border-radius: 30px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 16px;
}
.slot-badge .bullet {
  width: 8px;
  height: 8px;
  background: var(--color-primary);
  border-radius: 50%;
}

/* 首屏 HERO 区：投口与班次调度质感 */
.hero-section {
  padding: 60px 0 50px;
  position: relative;
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}
.hero-content h1 {
  font-size: 40px;
  line-height: 1.25;
  color: var(--color-primary);
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}
.hero-content .hero-subtitle {
  font-size: 17px;
  color: var(--color-text-muted);
  margin-bottom: 24px;
  line-height: 1.6;
}
.hero-btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 32px;
}
.btn-primary-large {
  background: var(--color-primary);
  color: #FFFFFF;
  font-size: 16px;
  font-weight: 700;
  padding: 14px 28px;
  border-radius: 8px;
  box-shadow: 0 4px 14px rgba(153, 43, 36, 0.3);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-primary-large:hover {
  background: var(--color-dark-iron);
  transform: translateY(-2px);
}
.btn-secondary-large {
  background: var(--color-secondary);
  color: var(--color-primary);
  font-size: 16px;
  font-weight: 700;
  padding: 14px 28px;
  border-radius: 8px;
  border: 1px solid var(--color-border);
}
.btn-secondary-large:hover {
  background: #E0D9C7;
}

/* 首屏邮筒投口物理卡与班次时刻表 */
.hero-slot-card {
  background: var(--color-primary);
  border: 3px solid var(--color-dark-iron);
  border-radius: 16px;
  padding: 24px;
  color: var(--color-secondary);
  box-shadow: var(--shadow-chute);
  position: relative;
}
.slot-metal-bar {
  background: linear-gradient(180deg, #D6CEBC 0%, #B8AD96 100%);
  border: 2px solid #8F826D;
  border-radius: 8px;
  padding: 12px 18px;
  color: var(--color-dark-iron);
  margin-bottom: 20px;
  box-shadow: var(--shadow-inset);
  text-align: center;
}
.slot-metal-bar .chute-title {
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 2px;
  text-transform: uppercase;
}
.slot-metal-bar .chute-opening {
  height: 12px;
  background: #240B09;
  border-radius: 6px;
  margin: 8px 0;
  box-shadow: inset 0 2px 4px #000;
}
.hero-slot-preview {
  border-radius: 10px;
  overflow: hidden;
  border: 2px solid rgba(235, 229, 214, 0.4);
  margin-bottom: 16px;
  background: #fff;
}
.hero-schedule-list {
  background: rgba(0, 0, 0, 0.2);
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 13px;
}
.hero-schedule-list .schedule-item {
  display: flex;
  justify-content: space-between;
  padding: 4px 0;
  border-bottom: 1px dashed rgba(235, 229, 214, 0.2);
}
.hero-schedule-list .schedule-item:last-child {
  border-bottom: none;
}

/* 核心功能区：4 横条特色 + 投递通道 */
.section-title-wrap {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 40px;
}
.section-title-wrap h2 {
  font-size: 32px;
  color: var(--color-primary);
  font-weight: 800;
  margin-bottom: 12px;
}
.section-title-wrap p {
  font-size: 16px;
  color: var(--color-text-muted);
}

.feature-slots-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}
.slot-feat-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-top: 4px solid var(--color-primary);
  border-radius: 10px;
  padding: 24px 20px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.03);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.slot-feat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-chute);
}
.slot-card-num {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}
.slot-feat-card h3 {
  font-size: 18px;
  color: var(--color-dark-iron);
  margin-bottom: 10px;
  font-weight: 700;
}
.slot-feat-card p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* 产品亮点左右交替图文区 */
.highlight-section {
  padding: 60px 0;
  background: rgba(235, 229, 214, 0.35);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.hl-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 50px;
}
.hl-row:last-child {
  margin-bottom: 0;
}
.hl-row.reverse {
  direction: rtl;
}
.hl-row.reverse .hl-text {
  direction: ltr;
}
.hl-img-wrap {
  border-radius: 12px;
  overflow: hidden;
  border: 2px solid var(--color-border);
  box-shadow: 0 6px 18px rgba(94, 23, 18, 0.08);
  background: #FFFFFF;
}
.hl-text h3 {
  font-size: 26px;
  color: var(--color-primary);
  font-weight: 800;
  margin-bottom: 14px;
}
.hl-text p {
  font-size: 15px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
  line-height: 1.7;
}
.hl-points {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.hl-points li {
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-text-main);
}
.hl-points li::before {
  content: "✔";
  color: var(--color-primary);
  font-weight: bold;
}

/* 4 步骤投递流 */
.steps-section {
  padding: 60px 0;
}
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
}
.step-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 24px 18px;
  text-align: center;
  position: relative;
}
.step-number-tag {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 14px;
  font-size: 15px;
  border: 2px solid var(--color-secondary);
}
.step-card h4 {
  font-size: 16px;
  color: var(--color-dark-iron);
  margin-bottom: 8px;
}
.step-card p {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* 深色对照清单（铸铁与红漆质感） */
.compare-section {
  padding: 60px 0;
  background: var(--color-dark-iron);
  color: var(--color-secondary);
}
.compare-section .section-title-wrap h2 {
  color: #FFFFFF;
}
.compare-section .section-title-wrap p {
  color: var(--color-secondary);
  opacity: 0.85;
}
.compare-table-wrap {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(235, 229, 214, 0.2);
  border-radius: 12px;
  overflow: hidden;
}
.compare-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 14px;
}
.compare-table th, .compare-table td {
  padding: 16px 20px;
  border-bottom: 1px solid rgba(235, 229, 214, 0.12);
}
.compare-table th {
  background: rgba(0, 0, 0, 0.35);
  font-weight: 700;
  color: var(--color-secondary);
}
.compare-table tr:last-child td {
  border-bottom: none;
}
.compare-table .badge-ok {
  color: #4ADE80;
  font-weight: 700;
}
.compare-table .badge-no {
  color: #F87171;
}

/* 4 岗位使用场景气泡卡 */
.scenario-section {
  padding: 60px 0;
}
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.scenario-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 22px 18px;
  position: relative;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.02);
}
.scenario-card .role-badge {
  font-size: 12px;
  font-weight: 700;
  background: var(--color-primary);
  color: #fff;
  padding: 3px 10px;
  border-radius: 20px;
  display: inline-block;
  margin-bottom: 12px;
}
.scenario-card h4 {
  font-size: 16px;
  color: var(--color-dark-iron);
  margin-bottom: 8px;
}
.scenario-card p {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* 3 列小技巧与 3 卡点笔记 */
.tips-section {
  padding: 50px 0;
  background: rgba(235, 229, 214, 0.3);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.tips-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 36px;
}
.tip-box {
  background: #FFFFFF;
  border-left: 4px solid var(--color-primary);
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.tip-box h4 {
  font-size: 16px;
  color: var(--color-primary);
  margin-bottom: 8px;
}
.tip-box p {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* 手风琴 FAQ（8 条原生 details/summary） */
.faq-section {
  padding: 60px 0;
}
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.faq-item {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  transition: all 0.25s ease;
}
.faq-item summary {
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-dark-iron);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}
.faq-item summary::-webkit-details-marker {
  display: none;
}
.faq-item summary::after {
  content: "+";
  font-size: 20px;
  color: var(--color-primary);
  transition: transform 0.25s ease;
}
.faq-item[open] summary::after {
  content: "−";
  transform: rotate(180deg);
}
.faq-item .faq-ans {
  padding: 0 20px 18px;
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.7;
  border-top: 1px dashed rgba(216, 206, 188, 0.6);
  padding-top: 14px;
}

/* 8 条带日期资讯列表 */
.news-section {
  padding: 50px 0 60px;
  background: var(--color-bg-base);
}
.news-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  max-width: 960px;
  margin: 0 auto;
}
.news-item {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 14px 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.news-item .news-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-main);
}
.news-item .news-date {
  font-size: 12px;
  color: var(--color-text-muted);
  background: var(--color-secondary);
  padding: 2px 8px;
  border-radius: 4px;
  white-space: nowrap;
  margin-left: 12px;
}

/* 底部 CTA 邮筒投递区 */
.cta-section {
  padding: 70px 0;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-dark-iron) 100%);
  color: #FFFFFF;
  text-align: center;
}
.cta-box {
  max-width: 800px;
  margin: 0 auto;
  border: 2px solid var(--color-brass);
  border-radius: 16px;
  padding: 48px 32px;
  background: rgba(0, 0, 0, 0.2);
  box-shadow: var(--shadow-chute);
}
.cta-box h2 {
  font-size: 32px;
  margin-bottom: 14px;
  color: var(--color-secondary);
}
.cta-box p {
  font-size: 16px;
  opacity: 0.9;
  margin-bottom: 28px;
}
.cta-actions {
  display: flex;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
}

/* 页脚 Footer 规范 */
.site-footer {
  background: #171312;
  color: #BDB4A8;
  padding: 60px 0 24px;
  font-size: 13px;
  border-top: 3px solid var(--color-primary);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-col h4 {
  color: var(--color-secondary);
  font-size: 15px;
  margin-bottom: 16px;
  font-weight: 700;
}
.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-links a:hover {
  color: #FFFFFF;
}
.footer-bottom {
  border-top: 1px solid rgba(235, 229, 214, 0.1);
  padding-top: 24px;
  text-align: center;
  font-size: 12px;
  line-height: 1.8;
  color: #8C8276;
}
.footer-bottom .cert-numbers {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-bottom: 8px;
}

/* 下载页与帮助页专属样式 */
.page-hero {
  padding: 50px 0 36px;
  background: var(--color-secondary);
  border-bottom: 2px solid var(--color-primary);
  margin-bottom: 40px;
}
.page-hero h1 {
  font-size: 32px;
  color: var(--color-primary);
  font-weight: 800;
  margin-bottom: 10px;
}
.page-hero p {
  color: var(--color-text-muted);
  font-size: 15px;
}

.dl-platform-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}
.dl-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-top: 4px solid var(--color-primary);
  border-radius: 12px;
  padding: 28px 22px;
  text-align: center;
  box-shadow: 0 4px 12px rgba(0,0,0,0.03);
}
.dl-card h3 {
  font-size: 20px;
  color: var(--color-dark-iron);
  margin-bottom: 10px;
}
.dl-card .version-tag {
  font-size: 12px;
  background: var(--color-secondary);
  color: var(--color-primary);
  padding: 3px 8px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 18px;
  font-weight: 600;
}
.dl-card .btn-download {
  display: block;
  background: var(--color-primary);
  color: #FFFFFF;
  padding: 12px;
  border-radius: 6px;
  font-weight: 700;
  margin-bottom: 14px;
}
.dl-card .btn-download:hover {
  background: var(--color-dark-iron);
}

.verify-box {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 50px;
}
.hash-code {
  font-family: monospace;
  background: #F3EFE6;
  padding: 8px 12px;
  border-radius: 4px;
  font-size: 13px;
  color: var(--color-dark-iron);
  display: block;
  margin-top: 6px;
  word-break: break-all;
}

/* 响应式断点适配 */
@media (max-width: 992px) {
  .hero-grid, .hl-row, .hl-row.reverse {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .feature-slots-grid, .steps-grid, .scenario-grid, .dl-platform-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .tips-grid, .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .news-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .feature-slots-grid, .steps-grid, .scenario-grid, .dl-platform-grid {
    grid-template-columns: 1fr;
  }
  .hero-content h1 {
    font-size: 28px;
  }
  .nav-links {
    display: none;
  }
}