/* ============================================================
   鸿观 (Hongguan) — Design Tokens
   暗色科技 · 玻璃拟态 · 渐变光效
   ============================================================ */

:root {
  /* —— Color · 背景层级 —— */
  --bg-canvas: #050810;
  --bg-surface: #0A0E1A;
  --bg-elevated: #111827;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.07);
  --bg-glass: rgba(15, 20, 35, 0.55);
  --bg-glass-strong: rgba(15, 20, 35, 0.78);

  /* —— Color · 品牌主色（科技蓝渐变） —— */
  --primary-50: #E6F2FF;
  --primary-100: #B8DCFF;
  --primary-300: #5BAEFF;
  --primary-500: #0066CC;
  --primary-600: #0052A6;
  --primary-700: #003E80;
  --primary-gradient: linear-gradient(135deg, #0066CC 0%, #00A3FF 100%);
  --primary-gradient-hover: linear-gradient(135deg, #0052A6 0%, #0088D6 100%);
  --primary-soft-glow: 0 0 30px rgba(0, 102, 204, 0.45);

  /* —— Color · 辅助色 —— */
  --accent-cyan: #00FFD1;
  --accent-cyan-soft: rgba(0, 255, 209, 0.18);
  --accent-purple: #6B46FF;
  --accent-purple-soft: rgba(107, 70, 255, 0.2);

  /* —— Color · 文本 —— */
  --text-primary: #F2F1EB;
  --text-secondary: rgba(255, 255, 255, 0.72);
  --text-tertiary: rgba(255, 255, 255, 0.5);
  --text-disabled: rgba(255, 255, 255, 0.32);
  --text-inverse: #0A0E1A;

  /* —— Color · 边框 / 分隔线 —— */
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-default: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.18);
  --border-accent: rgba(0, 163, 255, 0.45);

  /* —— Color · 状态 —— */
  --success: #17FB99;
  --warning: #FFBF5F;
  --danger: #FF4757;
  --info: #5BAEFF;

  /* —— Typography —— */
  --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont,
               'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, Monaco, Consolas, monospace;

  --fs-xs: 0.75rem;     /* 12px */
  --fs-sm: 0.875rem;    /* 14px */
  --fs-base: 1rem;      /* 16px */
  --fs-lg: 1.125rem;    /* 18px */
  --fs-xl: 1.25rem;     /* 20px */
  --fs-2xl: 1.5rem;     /* 24px */
  --fs-3xl: 1.875rem;   /* 30px */
  --fs-4xl: 2.25rem;    /* 36px */
  --fs-5xl: 3rem;       /* 48px */
  --fs-6xl: 3.75rem;    /* 60px */
  --fs-7xl: 4.5rem;     /* 72px */
  --fs-8xl: 5.25rem;    /* 84px */

  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;
  --fw-black: 800;

  --lh-tight: 1.1;
  --lh-snug: 1.3;
  --lh-normal: 1.6;
  --lh-relaxed: 1.8;

  /* —— Spacing · 4px 阶梯 —— */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-14: 56px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;
  --space-32: 128px;

  /* —— Border Radius —— */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-2xl: 32px;
  --radius-full: 9999px;

  /* —— Shadow / Glow —— */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 14px 40px rgba(0, 0, 0, 0.45);
  --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.55);
  --glow-primary: 0 0 40px rgba(0, 163, 255, 0.35);
  --glow-cyan: 0 0 30px rgba(0, 255, 209, 0.32);
  --glow-purple: 0 0 30px rgba(107, 70, 255, 0.32);

  /* —— Backdrop Blur —— */
  --blur-sm: blur(8px);
  --blur-md: blur(14px);
  --blur-lg: blur(22px);

  /* —— Layout —— */
  --container-max: 1200px;
  --container-wide: 1400px;
  --header-height: 72px;
  --header-height-mobile: 64px;

  /* —— Motion —— */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 160ms;
  --duration-base: 280ms;
  --duration-slow: 480ms;
  --duration-slower: 720ms;

  /* —— Z-index —— */
  --z-base: 1;
  --z-elevated: 10;
  --z-header: 100;
  --z-dropdown: 200;
  --z-modal: 1000;
  --z-toast: 2000;
}

/* ============================================================
   Reset & Base
   ============================================================ */

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

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

body {
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100vh;
  text-rendering: optimizeLegibility;
}

img,
svg,
video,
canvas {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

a:hover {
  color: var(--primary-300);
}

ul,
ol {
  list-style: none;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  outline: none;
}

button {
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

::selection {
  background: var(--primary-500);
  color: var(--text-primary);
}

/* 滚动条 */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-canvas); }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

/* 焦点可见性（无障碍） */
:focus-visible {
  outline: 2px solid var(--primary-300);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ============================================================
   Typography
   ============================================================ */

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

h1 { font-size: var(--fs-5xl); }
h2 { font-size: var(--fs-4xl); }
h3 { font-size: var(--fs-2xl); }
h4 { font-size: var(--fs-xl); }
h5 { font-size: var(--fs-lg); }
h6 { font-size: var(--fs-base); }

p { line-height: var(--lh-relaxed); color: var(--text-secondary); }

.lead { font-size: var(--fs-xl); line-height: var(--lh-snug); color: var(--text-primary); }
.text-sm { font-size: var(--fs-sm); }
.text-xs { font-size: var(--fs-xs); }
.text-muted { color: var(--text-tertiary); }
.text-gradient {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}
.text-accent { color: var(--accent-cyan); }

/* ============================================================
   Layout · 容器 / 网格 / Section
   ============================================================ */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container--wide { max-width: var(--container-wide); }

section {
  position: relative;
  padding: var(--space-24) 0;
}

section.tight { padding: var(--space-16) 0; }

.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

.section-header__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--primary-300);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}

.section-header__eyebrow::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--primary-300);
}

.section-header__title {
  font-size: var(--fs-5xl);
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

.section-header__subtitle {
  font-size: var(--fs-lg);
  color: var(--text-secondary);
  line-height: var(--lh-relaxed);
}

.section-header--left { text-align: left; margin-left: 0; margin-right: 0; }

/* 网格 */
.grid {
  display: grid;
  gap: var(--space-6);
}
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--6 { grid-template-columns: repeat(6, 1fr); }

/* Flex helpers */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* 文字 */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* 间距工具 */
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mt-16 { margin-top: var(--space-16); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }
.mb-16 { margin-bottom: var(--space-16); }
.mx-auto { margin-left: auto; margin-right: auto; }

/* ============================================================
   玻璃拟态 (Glassmorphism) 核心工具类
   ============================================================ */

.glass {
  background: var(--bg-glass);
  backdrop-filter: var(--blur-md);
  -webkit-backdrop-filter: var(--blur-md);
  border: 1px solid var(--border-default);
}

.glass-strong {
  background: var(--bg-glass-strong);
  backdrop-filter: var(--blur-lg);
  -webkit-backdrop-filter: var(--blur-lg);
  border: 1px solid var(--border-default);
}

.glass-card {
  position: relative;
  background: var(--bg-glass);
  backdrop-filter: var(--blur-md);
  -webkit-backdrop-filter: var(--blur-md);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: transform var(--duration-base) var(--ease-out),
              border-color var(--duration-base) var(--ease-out),
              background var(--duration-base) var(--ease-out);
  overflow: hidden;
}

.glass-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(0, 163, 255, 0.4), transparent 50%, rgba(0, 255, 209, 0.2));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--duration-base) var(--ease-out);
  pointer-events: none;
}

.glass-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
}

.glass-card:hover::before {
  opacity: 1;
}

/* ============================================================
   渐变背景工具类
   ============================================================ */

.gradient-mesh {
  position: relative;
  overflow: hidden;
}

.gradient-mesh::before,
.gradient-mesh::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
  pointer-events: none;
  z-index: 0;
}

.gradient-mesh::before {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 102, 204, 0.55) 0%, transparent 70%);
  top: -10%;
  left: -8%;
  animation: blobFloat 20s ease-in-out infinite;
}

.gradient-mesh::after {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0, 255, 209, 0.3) 0%, transparent 70%);
  bottom: -15%;
  right: -5%;
  animation: blobFloat 25s ease-in-out infinite reverse;
}

@keyframes blobFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(80px, -50px) scale(1.1); }
  50% { transform: translate(-40px, 60px) scale(0.95); }
  75% { transform: translate(50px, 30px) scale(1.05); }
}

.gradient-text {
  background: linear-gradient(135deg, #00A3FF 0%, #00FFD1 50%, #6B46FF 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.gradient-border {
  position: relative;
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
}

.gradient-border::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, #0066CC, #00A3FF, #00FFD1);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

/* ============================================================
   按钮 · 4 variants
   ============================================================ */

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 14px 28px;
  font-size: var(--fs-base);
  font-weight: var(--fw-semibold);
  line-height: 1;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
  transition: transform var(--duration-fast) var(--ease-out),
              background var(--duration-base) var(--ease-out),
              box-shadow var(--duration-base) var(--ease-out),
              border-color var(--duration-base) var(--ease-out);
}

.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--primary-gradient);
  color: var(--text-primary);
  box-shadow: var(--primary-soft-glow);
}

.btn--primary:hover {
  background: var(--primary-gradient-hover);
  box-shadow: 0 0 50px rgba(0, 163, 255, 0.6);
  color: var(--text-primary);
  transform: translateY(-2px);
}

.btn--secondary {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border-strong);
  backdrop-filter: var(--blur-sm);
}

.btn--secondary:hover {
  border-color: var(--primary-300);
  background: rgba(0, 163, 255, 0.08);
  color: var(--text-primary);
  transform: translateY(-2px);
}

.btn--ghost {
  background: transparent;
  color: var(--text-primary);
  padding: 10px 18px;
}

.btn--ghost:hover {
  color: var(--primary-300);
  background: rgba(0, 163, 255, 0.06);
}

.btn--small {
  padding: 8px 16px;
  font-size: var(--fs-sm);
}

.btn--large {
  padding: 18px 36px;
  font-size: var(--fs-lg);
}

.btn--block { display: flex; width: 100%; }

.btn .arrow {
  display: inline-block;
  transition: transform var(--duration-fast) var(--ease-out);
}

.btn:hover .arrow { transform: translateX(4px); }

/* ============================================================
   卡片
   ============================================================ */

.card {
  position: relative;
  background: var(--bg-glass);
  backdrop-filter: var(--blur-md);
  -webkit-backdrop-filter: var(--blur-md);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: all var(--duration-base) var(--ease-out);
  overflow: hidden;
}

.card--hover {
  cursor: pointer;
}

.card--hover:hover {
  transform: translateY(-6px);
  border-color: var(--border-accent);
  box-shadow: var(--shadow-lg), 0 0 40px rgba(0, 163, 255, 0.15);
}

.card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(0, 102, 204, 0.2), rgba(0, 255, 209, 0.1));
  border: 1px solid rgba(0, 163, 255, 0.3);
  margin-bottom: var(--space-5);
  color: var(--primary-300);
}

.card__title {
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  margin-bottom: var(--space-3);
  color: var(--text-primary);
}

.card__subtitle {
  font-size: var(--fs-sm);
  color: var(--primary-300);
  margin-bottom: var(--space-4);
  font-weight: var(--fw-medium);
  letter-spacing: 0.02em;
}

.card__desc {
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  line-height: var(--lh-relaxed);
  margin-bottom: var(--space-5);
}

.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.card__tags span {
  font-size: var(--fs-xs);
  padding: 4px 10px;
  background: rgba(0, 163, 255, 0.1);
  border: 1px solid rgba(0, 163, 255, 0.25);
  color: var(--primary-300);
  border-radius: var(--radius-full);
  font-weight: var(--fw-medium);
}

/* ============================================================
   导航 · Header
   ============================================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: var(--z-header);
  background: rgba(5, 8, 16, 0.6);
  backdrop-filter: var(--blur-md);
  -webkit-backdrop-filter: var(--blur-md);
  border-bottom: 1px solid transparent;
  transition: all var(--duration-base) var(--ease-out);
}

.site-header.is-scrolled {
  background: rgba(5, 8, 16, 0.85);
  border-bottom-color: var(--border-default);
}

.site-header__inner {
  height: 100%;
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.site-header__logo {
  height: 36px;
  width: auto;
  object-fit: contain;
}

.site-header__brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.site-header__brand-name {
  font-size: var(--fs-base);
  font-weight: var(--fw-bold);
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.site-header__brand-tagline {
  font-size: 11px;
  color: var(--text-tertiary);
  margin-top: 2px;
  font-weight: var(--fw-regular);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
  margin-right: var(--space-6);
}

.site-nav__link {
  position: relative;
  padding: 10px 16px;
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast) var(--ease-out),
              background var(--duration-fast) var(--ease-out);
}

.site-nav__link:hover,
.site-nav__link.is-active {
  color: var(--text-primary);
  background: rgba(0, 163, 255, 0.08);
}

.site-nav__link.is-active::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  background: var(--primary-300);
  border-radius: 50%;
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-full);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
}

.lang-switch a {
  padding: 4px 10px;
  border-radius: var(--radius-full);
  color: var(--text-tertiary);
  transition: all var(--duration-fast) var(--ease-out);
}

.lang-switch a:hover { color: var(--text-primary); }

.lang-switch a.is-active {
  background: var(--primary-gradient);
  color: var(--text-primary);
}

.mobile-menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-default);
}

.mobile-menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text-primary);
  position: relative;
  transition: all var(--duration-base) var(--ease-out);
}

.mobile-menu-toggle span::before,
.mobile-menu-toggle span::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--duration-base) var(--ease-out);
}

.mobile-menu-toggle span::before { top: -6px; }
.mobile-menu-toggle span::after { top: 6px; }

.mobile-menu-toggle.is-open span { background: transparent; }
.mobile-menu-toggle.is-open span::before { transform: translateY(6px) rotate(45deg); }
.mobile-menu-toggle.is-open span::after { transform: translateY(-6px) rotate(-45deg); }

.mobile-menu {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  z-index: var(--z-dropdown);
  background: rgba(5, 8, 16, 0.96);
  backdrop-filter: var(--blur-lg);
  -webkit-backdrop-filter: var(--blur-lg);
  padding: var(--space-8) var(--space-6);
  overflow-y: auto;
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity var(--duration-base) var(--ease-out),
              transform var(--duration-base) var(--ease-out);
  pointer-events: none;
}

.mobile-menu.is-open {
  display: block;
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.mobile-menu__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.mobile-menu__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  font-size: var(--fs-lg);
  font-weight: var(--fw-medium);
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
}

.mobile-menu__link:hover {
  background: rgba(0, 163, 255, 0.1);
  border-color: var(--border-accent);
  color: var(--primary-300);
}

.mobile-menu__link::after {
  content: '→';
  color: var(--text-tertiary);
  font-size: var(--fs-lg);
}

.mobile-menu__cta {
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-default);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.mobile-menu__lang {
  display: flex;
  gap: var(--space-2);
  justify-content: center;
  margin-bottom: var(--space-3);
}

/* ============================================================
   Footer
   ============================================================ */

.site-footer {
  background: linear-gradient(180deg, var(--bg-canvas) 0%, #020409 100%);
  border-top: 1px solid var(--border-default);
  padding: var(--space-20) 0 var(--space-6);
  margin-top: var(--space-24);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary-300), var(--accent-cyan), transparent);
  opacity: 0.5;
}

.site-footer__main {
  display: grid;
  grid-template-columns: 1.4fr 2fr;
  gap: var(--space-16);
  margin-bottom: var(--space-12);
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.site-footer__logo {
  height: 40px;
  width: auto;
}

.site-footer__tagline {
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  line-height: var(--lh-relaxed);
  max-width: 320px;
}

.site-footer__social {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.site-footer__social a {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all var(--duration-fast) var(--ease-out);
}

.site-footer__social a:hover {
  background: var(--primary-gradient);
  border-color: transparent;
  color: var(--text-primary);
  transform: translateY(-2px);
}

.site-footer__cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.footer-col__title {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.footer-col__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-col__links a {
  font-size: var(--fs-sm);
  color: var(--text-tertiary);
  transition: color var(--duration-fast) var(--ease-out);
}

.footer-col__links a:hover {
  color: var(--primary-300);
}

.footer-col__info {
  font-size: var(--fs-sm);
  color: var(--text-tertiary);
  line-height: var(--lh-relaxed);
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-subtle);
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
}

.site-footer__bottom a {
  color: var(--text-tertiary);
  transition: color var(--duration-fast) var(--ease-out);
}

.site-footer__bottom a:hover { color: var(--primary-300); }

.site-footer__legal {
  display: flex;
  gap: var(--space-5);
  flex-wrap: wrap;
}

/* ============================================================
   Form
   ============================================================ */

.form-group {
  margin-bottom: var(--space-4);
}

.form-label {
  display: block;
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.form-label__required {
  color: var(--accent-cyan);
  margin-left: 2px;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: var(--fs-sm);
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
  font-family: inherit;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--primary-300);
  background: rgba(0, 163, 255, 0.04);
  box-shadow: 0 0 0 3px rgba(0, 163, 255, 0.15);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-disabled);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
  line-height: var(--lh-relaxed);
}

.form-select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8' fill='none'%3e%3cpath d='M1 1l5 5 5-5' stroke='%23ffffff80' stroke-width='2' stroke-linecap='round'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}

.form-select option {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.form-checkbox {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  font-size: var(--fs-sm);
  color: var(--text-tertiary);
  cursor: pointer;
}

.form-checkbox input { margin-top: 4px; accent-color: var(--primary-500); }

/* ============================================================
   Badge / Tag / Chip
   ============================================================ */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  border-radius: var(--radius-full);
  background: rgba(0, 163, 255, 0.12);
  color: var(--primary-300);
  border: 1px solid rgba(0, 163, 255, 0.25);
}

.badge--cyan { background: rgba(0, 255, 209, 0.1); color: var(--accent-cyan); border-color: rgba(0, 255, 209, 0.3); }
.badge--purple { background: rgba(107, 70, 255, 0.12); color: #A78BFA; border-color: rgba(107, 70, 255, 0.3); }
.badge--success { background: rgba(23, 251, 153, 0.1); color: var(--success); border-color: rgba(23, 251, 153, 0.3); }
.badge--warning { background: rgba(255, 191, 95, 0.1); color: var(--warning); border-color: rgba(255, 191, 95, 0.3); }

/* ============================================================
   FAQ Accordion
   ============================================================ */

.faq {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.faq-item {
  background: var(--bg-glass);
  backdrop-filter: var(--blur-sm);
  -webkit-backdrop-filter: var(--blur-sm);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--duration-fast) var(--ease-out);
}

.faq-item.is-open {
  border-color: var(--border-accent);
}

.faq-item__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-6);
  font-size: var(--fs-base);
  font-weight: var(--fw-medium);
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: background var(--duration-fast) var(--ease-out);
}

.faq-item__question::-webkit-details-marker { display: none; }
.faq-item__question::marker { content: ''; }

.faq-item__question:hover {
  background: rgba(0, 163, 255, 0.04);
}

.faq-item__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-300);
  transition: transform var(--duration-base) var(--ease-out);
}

.faq-item.is-open .faq-item__icon { transform: rotate(45deg); }

.faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-slow) var(--ease-out);
}

.faq-item.is-open .faq-item__answer {
  max-height: 600px;
}

.faq-item__answer-inner {
  padding: 0 var(--space-6) var(--space-6);
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  line-height: var(--lh-relaxed);
}

/* ============================================================
   Hero · 首页专用
   ============================================================ */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
  overflow: hidden;
  background: var(--bg-canvas);
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.hero__bg-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero__bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(0, 102, 204, 0.4) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(0, 255, 209, 0.18) 0%, transparent 50%),
    radial-gradient(circle at 50% 100%, rgba(107, 70, 255, 0.2) 0%, transparent 60%);
  z-index: 1;
}

.hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 163, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 163, 255, 0.04) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
  z-index: 2;
}

.hero__inner {
  position: relative;
  z-index: 3;
  width: 100%;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-16);
  align-items: center;
  padding: var(--space-12) 0;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px 14px;
  background: rgba(0, 163, 255, 0.08);
  border: 1px solid rgba(0, 163, 255, 0.25);
  border-radius: var(--radius-full);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  color: var(--primary-300);
  margin-bottom: var(--space-6);
}

.hero__eyebrow .dot {
  width: 6px;
  height: 6px;
  background: var(--accent-cyan);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-cyan);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

.hero__title {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: var(--fw-black);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-6);
  color: var(--text-primary);
}

.hero__title-line {
  display: block;
  overflow: hidden;
}

.hero__subtitle {
  font-size: clamp(1rem, 1.5vw, 1.25rem);
  line-height: var(--lh-relaxed);
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
  max-width: 560px;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-12);
}

.hero__stats {
  display: flex;
  gap: var(--space-10);
  flex-wrap: wrap;
}

.hero__stat {
  display: flex;
  flex-direction: column;
}

.hero__stat-value {
  font-size: var(--fs-3xl);
  font-weight: var(--fw-black);
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  line-height: 1;
  margin-bottom: var(--space-1);
}

.hero__stat-label {
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.hero__visual {
  position: relative;
  aspect-ratio: 1;
  max-width: 520px;
  margin: 0 auto;
}

.hero__3d {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.hero__visual-frame {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-2xl);
  background: linear-gradient(135deg, rgba(0, 163, 255, 0.15) 0%, transparent 50%, rgba(0, 255, 209, 0.1) 100%);
  border: 1px solid var(--border-default);
  z-index: 2;
  pointer-events: none;
}

.hero__visual-frame::before {
  content: '';
  position: absolute;
  inset: 8px;
  border-radius: calc(var(--radius-2xl) - 8px);
  background: var(--bg-glass);
  backdrop-filter: var(--blur-sm);
  -webkit-backdrop-filter: var(--blur-sm);
  z-index: -1;
}

/* ============================================================
   Page Header (内页头)
   ============================================================ */

.page-header {
  position: relative;
  padding: calc(var(--header-height) + var(--space-20)) 0 var(--space-20);
  overflow: hidden;
  background: var(--bg-canvas);
}

.page-header__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(0, 102, 204, 0.25) 0%, transparent 60%),
    radial-gradient(circle at 80% 70%, rgba(107, 70, 255, 0.18) 0%, transparent 50%);
}

.page-header__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 163, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 163, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: linear-gradient(to bottom, black 0%, transparent 80%);
  -webkit-mask-image: linear-gradient(to bottom, black 0%, transparent 80%);
}

.page-header__inner {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 880px;
  margin: 0 auto;
}

.page-header__breadcrumbs {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  font-size: var(--fs-sm);
  color: var(--text-tertiary);
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
}

.page-header__breadcrumbs a {
  color: var(--text-tertiary);
  transition: color var(--duration-fast) var(--ease-out);
}

.page-header__breadcrumbs a:hover { color: var(--primary-300); }

.page-header__breadcrumbs span { color: var(--text-tertiary); }

.page-header__title {
  font-size: clamp(2.25rem, 4.5vw, 4rem);
  font-weight: var(--fw-black);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-5);
}

.page-header__subtitle {
  font-size: var(--fs-lg);
  color: var(--text-secondary);
  line-height: var(--lh-relaxed);
  max-width: 720px;
  margin: 0 auto;
}

/* ============================================================
   Tag chips · 行业 / 产品
   ============================================================ */

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-full);
  transition: all var(--duration-fast) var(--ease-out);
}

.chip:hover {
  color: var(--primary-300);
  border-color: var(--border-accent);
  background: rgba(0, 163, 255, 0.06);
}

/* ============================================================
   动画 · 滚动进场
   ============================================================ */

[data-reveal] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
  will-change: opacity, transform;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

[data-reveal][data-reveal-delay="100"] { transition-delay: 100ms; }
[data-reveal][data-reveal-delay="200"] { transition-delay: 200ms; }
[data-reveal][data-reveal-delay="300"] { transition-delay: 300ms; }
[data-reveal][data-reveal-delay="400"] { transition-delay: 400ms; }
[data-reveal][data-reveal-delay="500"] { transition-delay: 500ms; }
[data-reveal][data-reveal-delay="600"] { transition-delay: 600ms; }

[data-reveal="left"] { transform: translateX(-30px); }
[data-reveal="left"].is-visible { transform: translateX(0); }
[data-reveal="right"] { transform: translateX(30px); }
[data-reveal="right"].is-visible { transform: translateX(0); }
[data-reveal="scale"] { transform: scale(0.95); }
[data-reveal="scale"].is-visible { transform: scale(1); }

/* stagger children */
[data-reveal-stagger] > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

[data-reveal-stagger].is-visible > *:nth-child(1) { transition-delay: 0ms; opacity: 1; transform: translateY(0); }
[data-reveal-stagger].is-visible > *:nth-child(2) { transition-delay: 80ms; opacity: 1; transform: translateY(0); }
[data-reveal-stagger].is-visible > *:nth-child(3) { transition-delay: 160ms; opacity: 1; transform: translateY(0); }
[data-reveal-stagger].is-visible > *:nth-child(4) { transition-delay: 240ms; opacity: 1; transform: translateY(0); }
[data-reveal-stagger].is-visible > *:nth-child(5) { transition-delay: 320ms; opacity: 1; transform: translateY(0); }
[data-reveal-stagger].is-visible > *:nth-child(6) { transition-delay: 400ms; opacity: 1; transform: translateY(0); }
[data-reveal-stagger].is-visible > *:nth-child(7) { transition-delay: 480ms; opacity: 1; transform: translateY(0); }
[data-reveal-stagger].is-visible > *:nth-child(8) { transition-delay: 560ms; opacity: 1; transform: translateY(0); }

/* 用户偏好：减少动画 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
}

/* ============================================================
   响应式 · 4 breakpoints
   ============================================================ */

/* 1440px+ : 2xl */
@media (min-width: 1441px) {
  .container { padding: 0 var(--space-8); }
}

/* 1024-1440 : lg (default desktop) */
@media (max-width: 1200px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .site-footer__main { grid-template-columns: 1fr; gap: var(--space-10); }
  .site-footer__cols { grid-template-columns: repeat(3, 1fr); }
}

/* 768-1024 : md (tablet) */
@media (max-width: 1024px) {
  :root { --header-height: 64px; }
  section { padding: var(--space-16) 0; }
  .section-header__title { font-size: var(--fs-4xl); }
  .hero__inner { grid-template-columns: 1fr; gap: var(--space-10); }
  .hero__visual { max-width: 360px; }
  .site-nav { display: none; }
  .site-header__actions .btn { display: none; }
  .mobile-menu-toggle { display: inline-flex; }
  .lang-switch { margin-left: auto; }
  .grid--2 { grid-template-columns: 1fr; }
  .grid--3 { grid-template-columns: 1fr; }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--6 { grid-template-columns: repeat(3, 1fr); }
  .form-row { grid-template-columns: 1fr; }
}

/* 480-768 : sm (large mobile) */
@media (max-width: 768px) {
  :root { --header-height: 60px; }
  html { font-size: 15px; }
  .container { padding: 0 var(--space-5); }
  .site-header__inner { padding: 0 var(--space-4); gap: var(--space-3); }
  .site-header__brand-tagline { display: none; }
  .site-header__logo { height: 32px; }
  h1 { font-size: var(--fs-4xl); }
  h2 { font-size: var(--fs-3xl); }
  .section-header__title { font-size: var(--fs-3xl); }
  .page-header { padding: calc(var(--header-height) + var(--space-12)) 0 var(--space-12); }
  .page-header__title { font-size: var(--fs-3xl); }
  .hero__title { font-size: 2.5rem; }
  .hero__stats { gap: var(--space-6); }
  .hero__stat-value { font-size: var(--fs-2xl); }
  .grid--4 { grid-template-columns: 1fr; }
  .grid--6 { grid-template-columns: repeat(2, 1fr); }
  .site-footer__cols { grid-template-columns: 1fr 1fr; gap: var(--space-6); }
  .site-footer__bottom { flex-direction: column; text-align: center; }
  .site-footer__legal { justify-content: center; }
  .glass-card, .card { padding: var(--space-6); }
}

/* 320-480 : xs (mobile) */
@media (max-width: 480px) {
  html { font-size: 14px; }
  .container { padding: 0 var(--space-4); }
  .site-header__inner { padding: 0 var(--space-3); }
  .site-header__logo { height: 28px; }
  .site-header__brand-name { font-size: var(--fs-sm); }
  .lang-switch a { padding: 3px 8px; }
  .hero__title { font-size: 2rem; }
  .hero__visual { max-width: 280px; }
  .hero__cta { flex-direction: column; align-items: stretch; }
  .hero__cta .btn { width: 100%; }
  .grid--6 { grid-template-columns: 1fr; }
  .site-footer__cols { grid-template-columns: 1fr; }
  .btn { padding: 12px 20px; font-size: var(--fs-sm); }
  .btn--large { padding: 14px 24px; font-size: var(--fs-base); }
}

/* ============================================================
   跳过链接 (a11y)
   ============================================================ */

.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  z-index: var(--z-toast);
  padding: 12px 20px;
  background: var(--primary-500);
  color: var(--text-primary);
  font-weight: var(--fw-semibold);
  border-radius: 0 0 var(--radius-md) 0;
  transition: top var(--duration-base) var(--ease-out);
}

.skip-link:focus { top: 0; color: var(--text-primary); }

/* ============================================================
   工具 · 视觉
   ============================================================ */

.divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-default), transparent);
  margin: var(--space-12) 0;
}

.divider-vertical {
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--border-default), transparent);
}

/* 隐藏但对屏幕阅读器可见 */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* 图片占位（无图时降级） */
.placeholder-img {
  background: linear-gradient(135deg, rgba(0, 163, 255, 0.1), rgba(107, 70, 255, 0.05));
  border: 1px dashed var(--border-default);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  font-size: var(--fs-sm);
  position: relative;
  overflow: hidden;
}

.placeholder-img::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(45deg, transparent 48%, rgba(0, 163, 255, 0.15) 50%, transparent 52%),
    linear-gradient(-45deg, transparent 48%, rgba(0, 163, 255, 0.15) 50%, transparent 52%);
  background-size: 30px 30px;
  opacity: 0.4;
}

/* 计数器 */
.counter {
  font-variant-numeric: tabular-nums;
}

/* 加载中 */
.loading {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-top-color: var(--primary-300);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}