/* 本地字体（不依赖外部 CDN） */
@import './fonts.css';

/* ============================================================
   箱单智造官网 — 全局样式系统 v3.0
   风格：浅色极简 · 专业SaaS · 深蓝主色
   品牌升级版：增强视觉深度 · 优化动效系统
   ============================================================ */

/* ── 1. CSS 变量 ─────────────────────────────────────────── */
:root {
  /* 颜色 */
  --brand:          #1E40AF;
  --brand-light:    #3B82F6;
  --brand-soft:     #EFF6FF;
  --brand-border:   #BFDBFE;
  --brand-glow:     rgba(30, 64, 175, 0.15);
  --sky:            #0EA5E9;
  --sky-soft:       #F0F9FF;

  /* 渐变色系 */
  --gradient-brand: linear-gradient(135deg, #1E40AF 0%, #3B82F6 100%);
  --gradient-hero:  linear-gradient(160deg, #F8FAFC 0%, #EFF6FF 50%, #F0F9FF 100%);
  --gradient-card:  linear-gradient(180deg, rgba(255,255,255,0.9) 0%, rgba(255,255,255,1) 100%);

  /* 背景 */
  --bg:             #FFFFFF;
  --bg-subtle:      #F8FAFC;
  --bg-muted:       #F1F5F9;
  --bg-glass:       rgba(255, 255, 255, 0.85);
  --bg-overlay:     rgba(15, 23, 42, 0.5);

  /* 文字 */
  --text-heading:   #0F172A;
  --text-body:      #334155;
  --text-muted:     #64748B;
  --text-faint:     #94A3B8;
  --text-inverse:   #FFFFFF;

  /* 边框 */
  --line:           #E2E8F0;
  --line-strong:    #CBD5E1;

  /* 语义色 */
  --green:          #059669;
  --green-soft:     #ECFDF5;
  --amber:          #D97706;
  --amber-soft:     #FFFBEB;
  --red:            #DC2626;

  /* 间距 */
  --r-xs:    6px;
  --r-sm:    10px;
  --r-md:    16px;
  --r-lg:    24px;
  --r-xl:    32px;

  /* 阴影 */
  --shadow-xs:    0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-sm:    0 4px 12px rgba(15, 23, 42, 0.06);
  --shadow-md:    0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg:    0 16px 40px rgba(15, 23, 42, 0.12);
  --shadow-xl:    0 24px 56px rgba(15, 23, 42, 0.16);
  --shadow-brand: 0 8px 32px rgba(30, 64, 175, 0.25);
  --shadow-glow:  0 0 60px rgba(59, 130, 246, 0.2);

  /* 布局 */
  --max-w:   1280px;
  --nav-h:   72px;

  /* 动效 */
  --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-smooth:   cubic-bezier(0.4, 0, 0.2, 1);
  --ease-spring:   cubic-bezier(0.175, 0.885, 0.32, 1.275);
  --dur-fast:      150ms;
  --dur-normal:    300ms;
  --dur-slow:      500ms;

  /* 字体 */
  --font:         "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-en:      "Inter", "Segoe UI", "Helvetica Neue", sans-serif;
  --font-display: "Noto Serif SC", "Source Han Serif CN", "FZShuSong-Z01", serif;
}

/* ── 2. Reset & Base ──────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

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

h1,h2,h3,h4,h5,h6 {
  margin: 0;
  color: var(--text-heading);
  font-family: var(--font-display);
  line-height: 1.25;
  letter-spacing: -.01em;
}

p { margin: 0; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { cursor: pointer; font-family: inherit; }
ul,ol { margin: 0; padding: 0; list-style: none; }

/* ── 3. 布局工具 ──────────────────────────────────────────── */
.container {
  width: min(100%, var(--max-w));
  margin: 0 auto;
  padding: 0 28px;
}

.section {
  padding: 96px 0;
}

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

.section-accent {
  background: linear-gradient(135deg, #EFF6FF 0%, #F0F9FF 100%);
}

/* ── 4. 通用文字 ──────────────────────────────────────────── */
.kicker {
  display: inline-block;
  padding: 2px 0 2px 12px;
  border-radius: 0;
  border: none;
  border-left: 2.5px solid var(--brand);
  background: none;
  color: var(--text-muted);
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  line-height: 1.5;
}

.kicker::before {
  display: none;
}

.section-title {
  margin-top: 16px;
  font-size: clamp(28px, 3.2vw, 44px);
  font-weight: 800;
  color: var(--text-heading);
  letter-spacing: -.02em;
  line-height: 1.2;
}

.section-desc {
  margin-top: 14px;
  font-size: 17px;
  color: var(--text-body);
  max-width: 580px;
  line-height: 1.75;
}

.section-head {
  margin-bottom: 52px;
}

/* ── 5. 按钮 ──────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: var(--r-sm);
  border: 1.5px solid transparent;
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  white-space: nowrap;
  transition: all var(--dur-normal) var(--ease-smooth);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0.15) 0%, transparent 100%);
  opacity: 0;
  transition: opacity var(--dur-fast) ease;
}

.btn:hover::before {
  opacity: 1;
}

.btn-primary {
  background: var(--gradient-brand);
  color: #fff;
  border-color: transparent;
  box-shadow: var(--shadow-brand);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 36px rgba(30,64,175,.35);
}

.btn-secondary {
  background: #fff;
  color: var(--text-heading);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-xs);
}
.btn-secondary:hover {
  border-color: var(--brand-light);
  color: var(--brand);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  background: transparent;
  color: var(--brand);
  border-color: var(--brand-border);
}
.btn-ghost:hover {
  background: var(--brand-soft);
}

.btn-sm { padding: 9px 18px; font-size: 13px; border-radius: var(--r-xs); }
.btn-lg { padding: 16px 32px; font-size: 16px; border-radius: var(--r-md); }

/* 按钮点击效果 */
.btn:active {
  transform: translateY(-1px) scale(0.98);
}

/* ── 6. 徽章 ──────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .03em;
}

.badge-blue   { background: var(--brand-soft);  color: var(--brand);  border: 1px solid var(--brand-border); }
.badge-green  { background: var(--green-soft);  color: var(--green);  border: 1px solid #A7F3D0; }
.badge-amber  { background: var(--amber-soft);  color: var(--amber);  border: 1px solid #FCD34D; }
.badge-sky    { background: var(--sky-soft);    color: #0369A1;       border: 1px solid #BAE6FD; }
.badge-gray   { background: var(--bg-muted);    color: var(--text-muted); border: 1px solid var(--line); }

/* ── 7. 卡片 ──────────────────────────────────────────────── */
.card {
  background: var(--bg);
  border: 1.5px solid var(--line);
  border-radius: var(--r-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--dur-normal) var(--ease-smooth), 
              border-color var(--dur-normal) var(--ease-smooth), 
              transform var(--dur-normal) var(--ease-out-back);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--brand-border);
  transform: translateY(-5px);
}

/* 玻璃态卡片变体 */
.card-glass {
  background: var(--bg-glass);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid rgba(255,255,255,0.6);
}

/* ── 8. 导航 ──────────────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-h);
  background: rgba(255,255,255,.88);
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(20px) saturate(200%);
  -webkit-backdrop-filter: blur(20px) saturate(200%);
  transition: all var(--dur-normal) var(--ease-smooth);
}

.site-header.scrolled {
  background: rgba(255,255,255,.96);
  box-shadow: 0 4px 24px rgba(15,23,42,.08);
  border-bottom-color: var(--line);
}

.nav-shell {
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-shrink: 0;
  transition: transform var(--dur-fast) var(--ease-smooth);
}

.nav-logo:hover {
  transform: scale(1.02);
}

.nav-logo img {
  height: 36px;
  width: auto;
}

/* 导航链接 */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  position: relative;
  padding: 8px 16px;
  border-radius: var(--r-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-body);
  transition: all var(--dur-fast) var(--ease-smooth);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 20px;
  height: 2px;
  background: var(--brand);
  border-radius: 2px;
  transition: transform var(--dur-fast) var(--ease-out-back);
}

.nav-link:hover {
  color: var(--brand);
  background: var(--brand-soft);
}

.nav-link:hover::after {
  transform: translateX(-50%) scaleX(1);
}

.nav-link.active {
  color: var(--brand);
  background: var(--brand-soft);
  font-weight: 700;
}

.nav-link.active::after {
  transform: translateX(-50%) scaleX(1);
}

/* 右侧操作区 */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* 移动端汉堡菜单 */
.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  border: 1.5px solid var(--line-strong);
  border-radius: var(--r-sm);
  background: #fff;
  padding: 0;
  transition: all var(--dur-fast) var(--ease-smooth);
}

.menu-toggle:hover {
  border-color: var(--brand-light);
  background: var(--brand-soft);
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: var(--text-heading);
  transition: all var(--dur-normal) var(--ease-smooth);
}

.menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  display: none;
  border-top: 1px solid var(--line);
  background: rgba(255,255,255,.98);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
.mobile-menu.open { display: block; }
.mobile-menu-inner { padding: 16px 0 20px; }
.mobile-link {
  display: block;
  padding: 13px 4px;
  font-size: 15px;
  color: var(--text-body);
  border-bottom: 1px solid var(--line);
  transition: all var(--dur-fast) var(--ease-smooth);
}
.mobile-link:last-of-type { border-bottom: 0; }
.mobile-link:hover { color: var(--brand); padding-left: 8px; }
.mobile-link.active { color: var(--brand); font-weight: 700; }
.mobile-actions {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ── 9. 页脚 ──────────────────────────────────────────────── */
.site-footer {
  background: #0B1628;
  color: #94A3B8;
  padding-top: 64px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2.2fr 1fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(148,163,184,.15);
}

.footer-brand .logo-footer {
  height: 32px;
  margin-bottom: 16px;
  opacity: .95;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  color: #94A3B8;
  max-width: 320px;
}

.footer-col h4 {
  margin-bottom: 16px;
  color: #E2E8F0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
}

.footer-col a,
.footer-col span {
  display: block;
  margin-bottom: 10px;
  font-size: 13.5px;
  color: #94A3B8;
  transition: color var(--dur) var(--ease);
}

.footer-col a:hover { color: #E2E8F0; }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 20px 0 28px;
}

.footer-bottom p,
.footer-bottom a {
  font-size: 12px;
  color: #64748B;
}

.footer-bottom a:hover { color: #94A3B8; }

/* ── 10. 页面顶部横幅 ─────────────────────────────────────── */
.page-hero {
  position: relative;
  overflow: hidden;
  padding-top: calc(var(--nav-h) + 80px);
  padding-bottom: 88px;
  background: linear-gradient(160deg, #F8FAFC 0%, #EFF6FF 60%, #F0F9FF 100%);
  border-bottom: 1px solid var(--line);
}

.page-hero::before {
  content: "";
  position: absolute;
  left: -5%;
  top: -30%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(59,130,246,.05) 0%, transparent 65%);
  pointer-events: none;
  animation: float 20s ease-in-out infinite;
}

.page-hero::after {
  content: "";
  position: absolute;
  right: -10%;
  top: -20%;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(30,64,175,.06) 0%, transparent 65%);
  pointer-events: none;
  animation: float 25s ease-in-out infinite reverse;
}

.page-hero .kicker { margin-bottom: 20px; }

.page-hero h1 {
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 800;
  letter-spacing: -.025em;
  line-height: 1.15;
}

.page-hero p {
  margin-top: 16px;
  font-size: 18px;
  color: var(--text-body);
  max-width: 680px;
  line-height: 1.75;
}

/* ── 11. 通用工具 ─────────────────────────────────────────── */
.divider {
  width: 32px;
  height: 3px;
  border-radius: 0;
  background: var(--gradient-brand);
  margin-top: 20px;
}

/* 滚动动效 */
.fade-up {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity .6s var(--ease-out-back), transform .6s var(--ease-out-back);
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 延迟变体 */
.fade-up-delay-1 { transition-delay: .1s; }
.fade-up-delay-2 { transition-delay: .2s; }
.fade-up-delay-3 { transition-delay: .3s; }
.fade-up-delay-4 { transition-delay: .4s; }

/* 缩放入场 */
.scale-in {
  opacity: 0;
  transform: scale(.9);
  transition: opacity .5s var(--ease-out-back), transform .5s var(--ease-out-back);
}
.scale-in.visible {
  opacity: 1;
  transform: scale(1);
}

/* 滑入 */
.slide-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity .6s var(--ease-out-back), transform .6s var(--ease-out-back);
}
.slide-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.slide-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity .6s var(--ease-out-back), transform .6s var(--ease-out-back);
}
.slide-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* 浮动动画 */
@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  25% { transform: translateY(-12px) rotate(2deg); }
  50% { transform: translateY(-20px) rotate(0deg); }
  75% { transform: translateY(-8px) rotate(-2deg); }
}

@keyframes pulse-glow {
  0%, 100% { opacity: .4; transform: scale(1); }
  50% { opacity: .7; transform: scale(1.05); }
}

@keyframes gradient-shift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* 渐变文字 */
.gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
  animation: gradient-shift 8s ease infinite;
}

/* 光晕效果 */
.glow-effect {
  position: relative;
}

.glow-effect::before {
  content: "";
  position: absolute;
  inset: -20px;
  background: radial-gradient(circle, var(--brand-glow) 0%, transparent 70%);
  opacity: 0;
  transition: opacity var(--dur-normal) ease;
  pointer-events: none;
  z-index: -1;
}

.glow-effect:hover::before {
  opacity: 1;
}

/* 回到顶部按钮 */
.back-to-top {
  position: fixed;
  right: 28px;
  bottom: 28px;
  width: 48px;
  height: 48px;
  border: none;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: #fff;
  font-size: 18px;
  box-shadow: var(--shadow-brand);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(.8);
  transition: all var(--dur-normal) var(--ease-out-back);
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.back-to-top:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 12px 40px rgba(30,64,175,.35);
}

.back-to-top:active {
  transform: translateY(-2px) scale(.98);
}

/* ── 12. 响应式 ───────────────────────────────────────────── */
@media (max-width: 1080px) {
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 860px) {
  :root { --nav-h: 64px; }
  .container { padding: 0 20px; }
  .section { padding: 72px 0; }
  .nav-menu, .nav-actions { display: none; }
  .menu-toggle { display: inline-flex; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .page-hero p { font-size: 16px; }
}

@media (max-width: 600px) {
  .section { padding: 56px 0; }
  .btn-lg { padding: 14px 24px; font-size: 15px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }
}