/* ==========================================================================
   中山市汐洱网络科技有限公司 — 企业官网
   设计风格：新拟态 / Neumorphism（Soft UI）
   ========================================================================== */

:root {
  /* 圆角（风格关键视觉指纹，严格遵循） */
  --border-radius: 14px;
  --radius-lg: 22px;

  /* 色彩 */
  --color-light: #F5F5F5;
  --bg: #E6ECF3;
  --bg-grad: linear-gradient(145deg, #F0F5FA, #DDE4EC);
  --color-primary: #C8E0F4;
  --color-pink: #F5E0E8;
  --color-grey: #E8E8E8;

  --text: #2C3549;
  --text-muted: #5B6A80;
  --accent: #33608D;
  --accent-strong: #274B70;
  --accent-soft: #C8E0F4;
  --line: rgba(96, 114, 140, .18);

  /* 新拟态双向柔和阴影 */
  --shadow-soft-1: -6px -6px 14px rgba(255, 255, 255, .85);
  --shadow-soft-2: 6px 6px 14px rgba(96, 114, 140, .28);
  --shadow-raised: var(--shadow-soft-1), var(--shadow-soft-2);
  --shadow-raised-sm: -3px -3px 8px rgba(255, 255, 255, .85), 3px 3px 8px rgba(96, 114, 140, .22);
  --shadow-pressed: inset 4px 4px 10px rgba(96, 114, 140, .25), inset -4px -4px 10px rgba(255, 255, 255, .85);
  --shadow-flat: 2px 2px 6px rgba(96, 114, 140, .14), -2px -2px 6px rgba(255, 255, 255, .7);

  /* 排版 */
  --font: 'Nunito', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;

  /* 间距与布局 */
  --gap: 8px;
  --max-width: 1200px;
  --pad: 24px;

  --ease: cubic-bezier(.32, .72, .35, 1);
  --dur: 200ms;
}

/* --------------------------------------------------------------- reset -- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }

h1, h2, h3, h4 {
  margin: 0 0 16px;
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -.01em;
}

h1 {
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 1.1;
}

h2 { font-size: clamp(1.5rem, 3vw, 2rem); }

h3 {
  font-size: 18px;
  line-height: 1.3;
  font-weight: 700;
  margin-bottom: 8px;
}

p {
  margin: 0 0 16px;
  max-width: 34em;
}

p:last-child { margin-bottom: 0; }

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

ul, ol { margin: 0; padding: 0; }

li { list-style: none; }

strong { font-weight: 700; }

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 12px 20px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--border-radius);
}

.skip-link:focus {
  left: 16px;
  top: 16px;
}

/* ------------------------------------------------------------ 布局容器 -- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.section { padding: 72px 0; }

.section-head {
  max-width: 720px;
  margin-bottom: 40px;
}

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

.section-head.center p { margin-inline: auto; }

.eyebrow {
  display: inline-block;
  margin-bottom: 16px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--accent);
}

.lead {
  font-size: 17px;
  color: var(--text-muted);
}

/* 新拟态表面 */
.surface {
  background: var(--bg-grad);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-raised);
}

.surface-inset {
  background: linear-gradient(145deg, #DDE4EC, #F0F5FA);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-pressed);
}

/* ----------------------------------------------------------- 顶部导航 -- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(230, 236, 243, .88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 76px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  min-height: 44px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: none;
  border-radius: var(--border-radius);
  background: var(--bg-grad);
  box-shadow: var(--shadow-raised-sm);
  color: var(--accent);
}

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

.brand-text strong {
  font-size: 15px;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -.01em;
}

.brand-text small {
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: .12em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav a.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  border-radius: var(--border-radius);
  color: var(--text-muted);
  font-size: 15px;
  font-weight: 600;
  transition: color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.site-nav a.nav-link:hover,
.site-nav a.nav-link:focus-visible { color: var(--accent); }

.site-nav a.nav-link[aria-current="page"] {
  color: var(--accent);
  background: var(--bg-grad);
  box-shadow: var(--shadow-flat);
}

.nav-cta { margin-left: 12px; }

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  border-radius: var(--border-radius);
  background: var(--bg-grad);
  box-shadow: var(--shadow-raised-sm);
  color: var(--accent);
  cursor: pointer;
  place-items: center;
}

.nav-toggle:active { box-shadow: var(--shadow-pressed); }

/* ------------------------------------------------------------- 按钮 -- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 12px 24px;
  border: 0;
  border-radius: var(--border-radius);
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  cursor: pointer;
  transition: transform 150ms var(--ease), box-shadow var(--dur) var(--ease),
              background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 6px 14px rgba(51, 96, 141, .32), inset 0 1px 0 rgba(255, 255, 255, .18);
}

.btn-primary:hover {
  background: var(--accent-strong);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(51, 96, 141, .36);
}

.btn-primary:active {
  transform: translateY(0) scale(.98);
  box-shadow: inset 3px 3px 8px rgba(0, 0, 0, .22);
}

.btn-secondary {
  background: var(--bg-grad);
  color: var(--accent);
  box-shadow: var(--shadow-raised);
}

.btn-secondary:hover {
  transform: translateY(-2px);
  color: var(--accent-strong);
  box-shadow: -8px -8px 18px rgba(255, 255, 255, .9), 8px 8px 18px rgba(96, 114, 140, .3);
}

.btn-secondary:active {
  transform: translateY(0) scale(.98);
  box-shadow: var(--shadow-pressed);
}

.btn-ghost {
  min-height: 44px;
  padding: 10px 8px;
  background: transparent;
  color: var(--accent);
  box-shadow: none;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.btn-ghost:hover { color: var(--accent-strong); }

.btn[disabled],
.btn:disabled {
  cursor: not-allowed;
  color: #8B98AB;
  background: #DFE5EC;
  box-shadow: none;
  transform: none;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 24px;
}

.btn-block { width: 100%; }

/* --------------------------------------------------------------- chip -- */
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 32px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--bg-grad);
  box-shadow: var(--shadow-flat);
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .02em;
}

/* -------------------------------------------------------------- badge -- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.badge-soft {
  background: var(--color-pink);
  color: #8B4F66;
}

/* --------------------------------------------------------------- hero -- */
.hero { padding: 80px 0 64px; }

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  align-items: center;
  gap: 56px;
}

.hero h1 { margin-bottom: 20px; }

.hero h1 .accent { color: var(--accent); }

.hero .lead { font-size: 18px; max-width: 32em; }

.hero-panel {
  padding: 32px;
  border-radius: var(--radius-lg);
  background: var(--bg-grad);
  box-shadow: var(--shadow-raised);
}

.hero-visual svg { width: 100%; height: auto; }

.hero-note {
  margin-top: 16px;
  font-size: 14px;
  color: var(--text-muted);
}

/* -------------------------------------------------------------- 网格 -- */
.grid {
  display: grid;
  gap: 24px;
}

.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

/* --------------------------------------------------------- 特性卡片 -- */
.card {
  display: flex;
  flex-direction: column;
  padding: 24px;
  border-radius: var(--border-radius);
  background: var(--bg-grad);
  box-shadow: var(--shadow-raised);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: -8px -8px 20px rgba(255, 255, 255, .9), 10px 10px 22px rgba(96, 114, 140, .3);
}

.card-icon {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  margin-bottom: 20px;
  border-radius: var(--border-radius);
  background: var(--bg-grad);
  box-shadow: var(--shadow-pressed);
  color: var(--accent);
}

.card h3 { margin-bottom: 8px; }

.card p {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 0;
}

.card-link {
  margin-top: 20px;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.card-link:hover { color: var(--accent-strong); }

.card-link::after {
  content: "→";
  transition: transform var(--dur) var(--ease);
}

.card-link:hover::after { transform: translateX(3px); }

/* -------------------------------------------------------------- 列表 -- */
.check-list { display: grid; gap: 12px; }

.check-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 15px;
  color: var(--text-muted);
}

.check-list svg {
  flex: none;
  margin-top: 3px;
  color: var(--accent);
}

/* ---------------------------------------------------------- 数据条带 -- */
.stat-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  padding: 32px;
  border-radius: var(--radius-lg);
  background: var(--bg-grad);
  box-shadow: var(--shadow-pressed);
}

.stat-strip div { text-align: center; }

.stat-strip strong {
  display: block;
  font-size: 28px;
  font-weight: 900;
  color: var(--accent);
  line-height: 1.2;
}

.stat-strip span {
  font-size: 14px;
  color: var(--text-muted);
}

/* -------------------------------------------------------------- 表格 -- */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-raised);
}

table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  background: var(--bg-grad);
  font-size: 15px;
}

caption {
  padding: 16px 20px 0;
  text-align: left;
  font-size: 14px;
  color: var(--text-muted);
}

th, td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

thead th {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent);
}

tbody tr:last-child td { border-bottom: 0; }

td { color: var(--text-muted); }

/* -------------------------------------------------------------- 表单 -- */
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.form-field { display: flex; flex-direction: column; gap: 8px; }

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

label {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
}

.label-hint {
  font-weight: 400;
  color: var(--text-muted);
}

.input,
textarea,
select {
  width: 100%;
  min-height: 48px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: var(--border-radius);
  background: #DDE4EC;
  box-shadow: var(--shadow-pressed);
  color: var(--text);
  font-family: inherit;
  font-size: 15px;
  line-height: 1.5;
  transition: box-shadow var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

textarea {
  min-height: 140px;
  resize: vertical;
}

.input::placeholder,
textarea::placeholder { color: #8B98AB; }

.input:focus,
textarea:focus,
select:focus {
  outline: none;
  background: #E4EAF1;
  box-shadow: var(--shadow-pressed), 0 0 0 3px rgba(51, 96, 141, .35);
}

.input:focus-visible,
textarea:focus-visible,
select:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.field-error {
  font-size: 13px;
  color: #A33B54;
  min-height: 18px;
}

/* 开关 toggle */
.toggle-row {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px;
  border-radius: var(--border-radius);
  background: var(--bg-grad);
  box-shadow: var(--shadow-raised-sm);
}

.toggle {
  position: relative;
  flex: none;
  width: 58px;
  height: 32px;
  margin-top: 2px;
}

.toggle input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.toggle-track {
  position: absolute;
  inset: 0;
  border-radius: 999px;
  background: #D6DDE6;
  box-shadow: var(--shadow-pressed);
  transition: background-color var(--dur) var(--ease);
}

.toggle-track::after {
  content: "";
  position: absolute;
  top: 4px;
  left: 4px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-grad);
  box-shadow: var(--shadow-raised-sm);
  transition: transform var(--dur) var(--ease);
}

.toggle input:checked + .toggle-track { background: var(--accent-soft); }

.toggle input:checked + .toggle-track::after { transform: translateX(26px); }

.toggle input:focus-visible + .toggle-track { outline: 3px solid var(--accent); outline-offset: 3px; }

.toggle-text strong { display: block; font-size: 15px; }

.toggle-text span { font-size: 14px; color: var(--text-muted); }

.form-status {
  margin-top: 16px;
  padding: 16px 20px;
  border-radius: var(--border-radius);
  background: #E2EDF7;
  box-shadow: var(--shadow-raised-sm);
  font-size: 15px;
  color: var(--accent-strong);
}

.form-status[hidden] { display: none; }

/* ------------------------------------------------------- 联系信息卡 -- */
.contact-list { display: grid; gap: 16px; }

.contact-list li {
  display: flex;
  gap: 16px;
  padding: 20px;
  border-radius: var(--border-radius);
  background: var(--bg-grad);
  box-shadow: var(--shadow-raised);
}

.contact-list .card-icon {
  width: 44px;
  height: 44px;
  margin: 0;
  flex: none;
}

.contact-list strong { display: block; font-size: 15px; }

.contact-list span,
.contact-list a { font-size: 15px; color: var(--text-muted); }

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

/* -------------------------------------------------------------- 页脚 -- */
.site-footer {
  margin-top: 72px;
  padding: 56px 0 32px;
  background: linear-gradient(145deg, #DDE4EC, #CFD8E3);
  border-top: 1px solid var(--line);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
}

.site-footer h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 16px;
}

.site-footer p,
.site-footer li,
.site-footer a {
  font-size: 14px;
  color: var(--text-muted);
}

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

.footer-links { display: grid; gap: 8px; }

.footer-links a { display: inline-block; min-height: 24px; }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--text-muted);
}

/* --------------------------------------------------------- 页面头图 -- */
.page-head {
  padding: 56px 0 40px;
  border-bottom: 1px solid var(--line);
}

.page-head .lead { max-width: 40em; }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  font-size: 13px;
  color: var(--text-muted);
}

.breadcrumb a { color: var(--text-muted); }

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

/* ---------------------------------------------------------- 内容分栏 -- */
.split {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 40px;
  align-items: start;
}

.aside-panel {
  padding: 24px;
  border-radius: var(--radius-lg);
  background: var(--bg-grad);
  box-shadow: var(--shadow-raised);
  position: sticky;
  top: 100px;
}

.aside-panel h2 { font-size: 18px; margin-bottom: 12px; }

/* ------------------------------------------------------------ 时间线 -- */
.timeline { display: grid; gap: 20px; }

.timeline li {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 20px;
  padding: 20px;
  border-radius: var(--border-radius);
  background: var(--bg-grad);
  box-shadow: var(--shadow-raised-sm);
}

.timeline b { color: var(--accent); font-size: 15px; }

.timeline p { font-size: 15px; color: var(--text-muted); margin: 0; }

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

  .aside-panel { position: static; }

  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

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

@media (max-width: 768px) {
  .section { padding: 56px 0; }

  .hero { padding: 56px 0 48px; }

  .nav-toggle { display: grid; }

  .site-nav {
    position: absolute;
    left: var(--pad);
    right: var(--pad);
    top: calc(100% + 8px);
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    padding: 16px;
    border-radius: var(--radius-lg);
    background: var(--bg-grad);
    box-shadow: var(--shadow-raised);
  }

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

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

  .site-nav a.nav-link { justify-content: flex-start; }

  .nav-cta { margin-left: 0; }

  .grid-3,
  .grid-2,
  .form-grid,
  .stat-strip,
  .footer-grid { grid-template-columns: 1fr; }

  .timeline li { grid-template-columns: 1fr; gap: 8px; }
}

@media (max-width: 400px) {
  :root { --pad: 16px; }
}

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

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    transition-duration: .001ms !important;
  }
}