/* ============================================================
   智能水杯 PC 官网 — 全站统一样式（设计令牌单一来源）
   视觉取自 App 真实品牌色：深色科技风
   ============================================================ */

/* ---------- 设计令牌 ---------- */
:root {
  /* 品牌色（取自 App lib 中的真实配色） */
  --c-primary: #5d89ff;        /* 主蓝 */
  --c-primary-600: #4c82ff;
  --c-primary-700: #3a6bf0;
  --c-accent-green: #7dfa5a;   /* 辅色绿 */
  --c-accent-amber: #ffb637;   /* 辅色琥珀 */
  --c-accent-purple: #b63dff;  /* 辅色紫 */

  /* 深色基调 */
  --c-bg: #0e1016;             /* 页面底 */
  --c-bg-1: #13151b;           /* 区块底 */
  --c-bg-2: #1a1c23;           /* 卡片底 */
  --c-bg-3: #22252e;           /* 浮起 */
  --c-border: #2c2f37;

  /* 文本 */
  --c-text: #f7f8fb;
  --c-text-2: #b9bdc9;
  --c-text-3: #7e8493;

  /* 排版 */
  --font: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --fs-hero: clamp(2.4rem, 4.6vw, 4rem);
  --fs-h2: clamp(1.7rem, 2.8vw, 2.4rem);
  --fs-h3: 1.25rem;
  --fs-body: 1rem;
  --fs-sm: 0.875rem;

  /* 间距 / 圆角 / 阴影 */
  --space: 1rem;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 60px rgba(93, 137, 255, 0.25);
  --maxw: 1180px;
  --header-h: 72px;

  /* 渐变 */
  --grad-primary: linear-gradient(135deg, #5d89ff 0%, #b63dff 100%);
  --grad-text: linear-gradient(120deg, #7dfa5a, #5d89ff 60%, #b63dff);
}

/* ---------- 基础重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: var(--fs-body);
  line-height: 1.65;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }

h1, h2, h3, p { margin: 0; }

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

.section { padding-block: clamp(56px, 8vw, 110px); }
.section--alt { background: var(--c-bg-1); }

.eyebrow {
  display: inline-block;
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-primary);
  margin-bottom: 14px;
}

.section-title {
  font-size: var(--fs-h2);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.section-lead {
  margin-top: 16px;
  max-width: 640px;
  color: var(--c-text-2);
  font-size: 1.05rem;
}

.text-grad {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

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

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}
.btn:active { transform: translateY(1px); }
.btn--primary {
  background: var(--grad-primary);
  color: #fff;
  box-shadow: 0 8px 24px rgba(93, 137, 255, 0.35);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(93, 137, 255, 0.5); }
.btn--ghost {
  background: transparent;
  border-color: var(--c-border);
  color: var(--c-text);
}
.btn--ghost:hover { border-color: var(--c-primary); color: var(--c-primary); }

/* ---------- 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: rgba(14, 16, 22, 0.72);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--c-border);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}
.brand img { width: 32px; height: 32px; }

.nav { display: flex; align-items: center; gap: 6px; }
.nav a {
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.95rem;
  color: var(--c-text-2);
  transition: color 0.15s ease, background 0.15s ease;
}
.nav a:hover { color: var(--c-text); }
.nav a.is-active { color: var(--c-text); background: var(--c-bg-2); }

.header-cta { display: flex; align-items: center; gap: 10px; }

/* 纯 CSS 汉堡菜单 */
.nav-toggle {
  /* 视觉隐藏但保留可聚焦，保证键盘可达（WCAG 2.1.1） */
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; border: 0;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}
.hamburger {
  display: none;
  width: 44px; height: 44px;
  border: 1px solid var(--c-border);
  border-radius: 12px;
  background: var(--c-bg-2);
  cursor: pointer;
  position: relative;
}
.nav-toggle:focus-visible ~ .hamburger {
  outline: 2px solid var(--c-primary);
  outline-offset: 2px;
}
.hamburger span,
.hamburger span::before,
.hamburger span::after {
  content: "";
  position: absolute;
  left: 50%; transform: translateX(-50%);
  width: 20px; height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: 0.25s ease;
}
.hamburger span { top: 50%; margin-top: -1px; }
.hamburger span::before { top: -7px; }
.hamburger span::after { top: 7px; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding-block: clamp(64px, 9vw, 130px);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 50% at 75% 10%, rgba(93, 137, 255, 0.22), transparent 70%),
    radial-gradient(50% 45% at 15% 80%, rgba(182, 61, 255, 0.16), transparent 70%);
  pointer-events: none;
}
.hero .container {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 48px;
}
.hero h1 {
  font-size: var(--fs-hero);
  font-weight: 850;
  line-height: 1.08;
  letter-spacing: -0.02em;
}
.hero p.lead {
  margin-top: 22px;
  font-size: 1.15rem;
  color: var(--c-text-2);
  max-width: 520px;
}
.hero-actions { margin-top: 34px; display: flex; flex-wrap: wrap; gap: 14px; }
.hero-stats {
  margin-top: 40px;
  display: flex;
  gap: 36px;
  flex-wrap: wrap;
}
.hero-stats .num {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--c-text);
}
.hero-stats .lbl { font-size: var(--fs-sm); color: var(--c-text-3); }
.hero-visual { display: flex; justify-content: center; }
.hero-visual img { width: min(100%, 420px); filter: drop-shadow(0 30px 60px rgba(93,137,255,0.3)); }

/* ---------- 卡片网格 ---------- */
.grid {
  display: grid;
  gap: 22px;
  margin-top: 48px;
}
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(93, 137, 255, 0.5);
  box-shadow: var(--shadow);
}
.card .icon {
  width: 52px; height: 52px;
  margin-bottom: 18px;
}
.card h3 { font-size: var(--fs-h3); font-weight: 700; margin-bottom: 10px; }
.card p { color: var(--c-text-2); font-size: 0.95rem; }

/* ---------- 数据亮点带 ---------- */
.stats-band {
  background: var(--c-bg-1);
  border-block: 1px solid var(--c-border);
}
.stats-band .container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding-block: 56px;
  text-align: center;
}
.stat .num {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 850;
  background: var(--grad-text);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stat .lbl { color: var(--c-text-3); font-size: var(--fs-sm); margin-top: 6px; }

/* ---------- 特性大区块（图文交错） ---------- */
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
  padding-block: clamp(40px, 6vw, 80px);
}
.feature-row:nth-child(even) .feature-media { order: -1; }
.feature-media {
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 36px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow);
}
.feature-media img { width: min(100%, 320px); }
.feature-row h3 { font-size: var(--fs-h2); font-weight: 800; letter-spacing: -0.01em; }
.feature-row .desc { margin-top: 16px; color: var(--c-text-2); }
.feature-list { margin-top: 22px; display: grid; gap: 12px; }
.feature-list li {
  display: flex; gap: 12px; align-items: flex-start;
  color: var(--c-text-2); font-size: 0.97rem;
}
.feature-list li::before {
  content: "";
  flex: none;
  margin-top: 7px;
  width: 8px; height: 8px; border-radius: 3px;
  background: var(--grad-primary);
}

/* ---------- 参数表 ---------- */
.spec-table {
  width: 100%;
  margin-top: 40px;
  border-collapse: collapse;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
}
.spec-table th, .spec-table td {
  text-align: left;
  padding: 16px 22px;
  border-bottom: 1px solid var(--c-border);
}
.spec-table th { background: var(--c-bg-2); color: var(--c-text-3); font-weight: 600; width: 32%; font-size: var(--fs-sm); }
.spec-table td { color: var(--c-text); }
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: none; }

/* ---------- CTA 区 ---------- */
.cta-band {
  position: relative;
  text-align: center;
  overflow: hidden;
}
.cta-card {
  position: relative;
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-radius: 28px;
  padding: clamp(40px, 6vw, 72px);
  box-shadow: var(--shadow-glow);
  overflow: hidden;
}
.cta-card::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(60% 120% at 50% 0%, rgba(93,137,255,0.18), transparent 70%);
}
.cta-card > * { position: relative; }
.cta-card h2 { font-size: var(--fs-h2); font-weight: 850; }
.cta-card p { margin-top: 14px; color: var(--c-text-2); }
.cta-card .hero-actions { justify-content: center; }

/* ---------- 联系表单 ---------- */
.contact-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-top: 48px;
}
.contact-info li {
  display: flex; gap: 14px; align-items: flex-start;
  padding-block: 14px;
  border-bottom: 1px solid var(--c-border);
  color: var(--c-text-2);
}
.contact-info .k { color: var(--c-text-3); font-size: var(--fs-sm); }
.contact-info .v { color: var(--c-text); font-weight: 600; }

.form { display: grid; gap: 18px; }
.field { display: grid; gap: 8px; }
.field label { font-size: var(--fs-sm); color: var(--c-text-2); }
.field label .req { color: var(--c-accent-amber); }
.field input,
.field textarea {
  width: 100%;
  padding: 13px 16px;
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  color: var(--c-text);
  font: inherit;
  font-size: 0.95rem;
  transition: border-color 0.15s ease;
}
.field input:focus,
.field textarea:focus { outline: none; border-color: var(--c-primary); }
.field textarea { resize: vertical; min-height: 120px; }
.field .err {
  font-size: var(--fs-sm);
  color: #ff6b6b;
  display: none;
}
.field.invalid input,
.field.invalid textarea { border-color: #ff6b6b; }
.field.invalid .err { display: block; }
.form-status {
  font-size: var(--fs-sm);
  color: var(--c-accent-green);
  min-height: 1.2em;
}

/* ---------- 公司信息 ---------- */
.company-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 40px;
}
.company-item {
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  padding: 18px 22px;
}
.company-item .k {
  font-size: var(--fs-sm);
  color: var(--c-text-3);
  margin-bottom: 6px;
}
.company-item .v {
  color: var(--c-text);
  font-weight: 600;
  line-height: 1.5;
}
.company-item--wide { grid-column: 1 / -1; }
.company-note {
  margin-top: 18px;
  font-size: var(--fs-sm);
  color: var(--c-text-3);
}
.holder-table {
  width: 100%;
  margin-top: 8px;
  border-collapse: collapse;
}
.holder-table th,
.holder-table td {
  text-align: left;
  padding: 8px 0;
  border-bottom: 1px solid var(--c-border);
  font-size: 0.95rem;
}
.holder-table th { color: var(--c-text-3); font-weight: 600; font-size: var(--fs-sm); }
.holder-table tr:last-child td { border-bottom: none; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--c-bg-1);
  border-top: 1px solid var(--c-border);
  padding-block: 56px 32px;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
}
.footer-brand p { margin-top: 14px; color: var(--c-text-3); font-size: 0.92rem; max-width: 280px; }
.footer-col h4 { font-size: var(--fs-sm); color: var(--c-text-3); margin-bottom: 16px; letter-spacing: 0.05em; text-transform: uppercase; }
.footer-col a { display: block; padding-block: 6px; color: var(--c-text-2); font-size: 0.95rem; }
.footer-col a:hover { color: var(--c-primary); }
.footer-bottom {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--c-border);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  color: var(--c-text-3); font-size: var(--fs-sm);
}

/* ---------- 进入动画 ---------- */
@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(18px); animation: reveal 0.7s ease forwards; }
  .reveal:nth-child(2) { animation-delay: 0.08s; }
  .reveal:nth-child(3) { animation-delay: 0.16s; }
  .reveal:nth-child(4) { animation-delay: 0.24s; }
  @keyframes reveal { to { opacity: 1; transform: none; } }
}

/* ============================================================
   响应式：三档（≥1025 桌面 / 768–1024 平板 / <768 移动，<420 窄屏微调）
   ============================================================ */
@media (max-width: 1024px) {
  .hero .container { grid-template-columns: 1fr; }
  .hero-visual { order: -1; }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  /* 汉堡菜单接管 */
  .hamburger { display: block; }
  .nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 16px 24px 24px;
    background: var(--c-bg-1);
    border-bottom: 1px solid var(--c-border);
    transform: translateY(-120%);
    transition: transform 0.3s ease;
    box-shadow: var(--shadow);
  }
  .nav a { padding: 12px 14px; }
  .nav-toggle:checked ~ .nav { transform: translateY(0); }
  .nav-toggle:checked ~ .hamburger span { background: transparent; }
  .nav-toggle:checked ~ .hamburger span::before { top: 0; transform: rotate(45deg); }
  .nav-toggle:checked ~ .hamburger span::after { top: 0; transform: rotate(-45deg); }

  .grid--3, .grid--2 { grid-template-columns: 1fr; }
  .stats-band .container { grid-template-columns: repeat(2, 1fr); row-gap: 36px; }
  .feature-row { grid-template-columns: 1fr; gap: 28px; }
  .feature-row:nth-child(even) .feature-media { order: 0; }
  .contact-wrap { grid-template-columns: 1fr; }
  .company-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; gap: 28px; }
  .header-cta { display: none; }
}

@media (max-width: 420px) {
  .grid--4 { grid-template-columns: 1fr; }
  .hero-stats { gap: 22px; }
}