/* ==========================================================================
   Aurora UI — 流动渐变设计系统
   站点：PHP个人工作站  |  主字体：Space Grotesk  |  核心圆角：14px
   ========================================================================== */

/* ---------- 1. 设计系统变量 ---------- */
:root {
  /* 极光色板 */
  --g-blue: #0080FF;
  --g-magenta: #FF1493;
  --g-cyan: #00FFFF;
  --g-purple: #7B2FFF;

  /* 深色主题（默认） */
  --bg: #0B1026;
  --bg-soft: #0E1430;
  --ink: #F2F6FF;
  --muted: #A9B4D8;
  --surface: rgba(255, 255, 255, .06);
  --surface-strong: rgba(255, 255, 255, .10);
  --line: rgba(255, 255, 255, .16);
  --glow: rgba(123, 47, 255, .45);

  /* 形状与节奏 */
  --radius: 14px;
  --animation-duration: 10s;
  --step: 8px;
  --maxw: 1200px;

  /* 排版 */
  --font: "Space Grotesk", system-ui, -apple-system, "Segoe UI", Roboto,
    "Helvetica Neue", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;

  --fs-hero: clamp(2rem, 5vw, 4rem);
  --fs-h2: clamp(1.5rem, 3vw, 2rem);
  --fs-card: 18px;
  --fs-body: 16px;
  --fs-sub: 15px;
  --fs-label: 13px;

  --ease: cubic-bezier(.22, 1, .36, 1);
  --dur: .35s;
}

/* 浅色主题 */
:root[data-theme="light"] {
  --bg: #F2F5FD;
  --bg-soft: #E9EEFA;
  --ink: #0B1026;
  --muted: #4C5878;
  --surface: rgba(255, 255, 255, .72);
  --surface-strong: rgba(255, 255, 255, .92);
  --line: rgba(11, 16, 38, .14);
  --glow: rgba(123, 47, 255, .28);
}

/* ---------- 2. 基础重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: 1.6;
  letter-spacing: .01em;
  overflow-x: hidden;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; color: inherit; }

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -.01em;
}
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }

::selection { background: var(--g-purple); color: #fff; }

/* 焦点环 —— 键盘可见 */
:focus-visible {
  outline: 2px solid var(--g-cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -64px;
  z-index: 100;
  padding: 10px 18px;
  border-radius: var(--radius);
  background: var(--bg-soft);
  border: 1px solid var(--line);
  backdrop-filter: blur(12px);
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 16px; }

/* ---------- 3. 极光背景 ---------- */
.aurora {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background: var(--bg);
  transition: background var(--dur) var(--ease);
}

.aurora__layer {
  position: absolute;
  inset: -35%;
  filter: blur(70px) saturate(1.35);
  mix-blend-mode: screen;
  will-change: transform, background-position;
  background-size: 200% 200%;
}

.aurora__layer--a {
  background:
    radial-gradient(42% 42% at 22% 26%, var(--g-purple) 0%, rgba(123, 47, 255, 0) 64%),
    radial-gradient(38% 38% at 78% 18%, var(--g-blue) 0%, rgba(0, 128, 255, 0) 62%),
    radial-gradient(46% 46% at 72% 78%, var(--g-magenta) 0%, rgba(255, 20, 147, 0) 64%),
    radial-gradient(40% 40% at 24% 84%, var(--g-cyan) 0%, rgba(0, 255, 255, 0) 62%);
  opacity: .55;
  animation: aurora-drift var(--animation-duration) ease-in-out infinite alternate,
             gradient-shift calc(var(--animation-duration) * 1.6) ease-in-out infinite;
}

.aurora__layer--b {
  background:
    conic-gradient(from 140deg at 60% 45%,
      rgba(0, 128, 255, .55),
      rgba(123, 47, 255, .5),
      rgba(255, 20, 147, .45),
      rgba(0, 255, 255, .45),
      rgba(0, 128, 255, .55));
  opacity: .16;
  animation: aurora-spin calc(var(--animation-duration) * 2.4) linear infinite;
}

.aurora__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .035) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(80% 60% at 50% 30%, #000 20%, transparent 100%);
  -webkit-mask-image: radial-gradient(80% 60% at 50% 30%, #000 20%, transparent 100%);
}

:root[data-theme="light"] .aurora__layer--a { opacity: .45; }
:root[data-theme="light"] .aurora__layer--b { opacity: .13; }
:root[data-theme="light"] .aurora__grid {
  background-image:
    linear-gradient(rgba(11, 16, 38, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(11, 16, 38, .05) 1px, transparent 1px);
}

@keyframes aurora-drift {
  0%   { transform: translate3d(-4%, -2%, 0) scale(1.05) rotate(0deg); }
  50%  { transform: translate3d(3%, 3%, 0) scale(1.14) rotate(7deg); }
  100% { transform: translate3d(-2%, 4%, 0) scale(1.08) rotate(-6deg); }
}
@keyframes aurora-spin  { to { transform: rotate(360deg) scale(1.1); } }
@keyframes gradient-shift {
  0%, 100% { background-position: 0% 50%; }
  50%      { background-position: 100% 50%; }
}

/* ---------- 4. 布局骨架 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 64px 0; }
.section--tight { padding: 40px 0; }

.section-head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
  max-width: 46ch;
}

.section-head--center {
  max-width: 62ch;
  margin-inline: auto;
  text-align: center;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-label);
  font-weight: 500;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--g-cyan), var(--g-purple), var(--g-magenta));
}

.lead {
  color: var(--muted);
  font-size: var(--fs-sub);
  line-height: 1.6;
  max-width: 34em;
}

.divider {
  height: 1px;
  border: 0;
  margin: 0;
  background: linear-gradient(90deg, transparent, var(--line) 20%, var(--line) 80%, transparent);
}

/* ---------- 5. 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 76%, transparent);
  backdrop-filter: blur(18px) saturate(1.3);
  -webkit-backdrop-filter: blur(18px) saturate(1.3);
}

.nav {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -.01em;
  white-space: nowrap;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius);
  color: #fff;
  background: linear-gradient(135deg, var(--g-blue), var(--g-purple) 52%, var(--g-magenta));
  box-shadow: 0 8px 22px -10px var(--g-purple);
  background-size: 200% 200%;
  animation: gradient-shift calc(var(--animation-duration) * 1.4) ease-in-out infinite;
}
.brand__mark svg { width: 21px; height: 21px; }

.nav__links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  border-radius: var(--radius);
  font-size: var(--fs-sub);
  font-weight: 500;
  color: var(--muted);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.nav__link:hover { color: var(--ink); background: var(--surface); }
.nav__link[aria-current="page"] { color: var(--ink); }
.nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 6px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--g-cyan), var(--g-purple), var(--g-magenta));
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: 12px;
}

.theme-toggle {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.theme-toggle:hover { background: var(--surface-strong); transform: translateY(-1px); }
.theme-toggle svg { width: 19px; height: 19px; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: none; }
:root:not([data-theme="light"]) .theme-toggle .icon-sun { display: none; }

.nav__burger {
  display: none;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
}
.nav__burger svg { width: 20px; height: 20px; }
.nav__burger .icon-close { display: none; }
.nav__burger[aria-expanded="true"] .icon-menu { display: none; }
.nav__burger[aria-expanded="true"] .icon-close { display: block; }

/* ---------- 6. 按钮 ---------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: var(--fs-sub);
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
    background var(--dur) var(--ease), border-color var(--dur) var(--ease),
    color var(--dur) var(--ease), filter var(--dur) var(--ease);
}
.btn svg { width: 18px; height: 18px; }

.btn--primary {
  color: #FFFFFF;
  background: linear-gradient(100deg, var(--g-blue), var(--g-purple) 50%, var(--g-magenta));
  background-size: 200% 200%;
  box-shadow: 0 12px 30px -12px rgba(0, 128, 255, .75);
  animation: gradient-shift calc(var(--animation-duration) * 1.3) ease-in-out infinite;
}
.btn--primary:hover {
  filter: saturate(1.25);
  transform: translateY(-2px);
  box-shadow: 0 18px 42px -12px rgba(255, 20, 147, .7);
}
.btn--primary:active {
  transform: translateY(0) scale(.98);
  box-shadow: 0 6px 16px -8px rgba(123, 47, 255, .8);
}

.btn--secondary {
  color: var(--ink);
  background: var(--surface);
  border-color: var(--line);
  backdrop-filter: blur(10px);
}
.btn--secondary:hover {
  background: var(--surface-strong);
  border-color: color-mix(in srgb, var(--g-cyan) 55%, var(--line));
  transform: translateY(-2px);
}
.btn--secondary:active { transform: translateY(0) scale(.98); }

.btn--ghost {
  color: var(--muted);
  background: transparent;
  padding-inline: 6px;
  border-radius: 8px;
}
.btn--ghost:hover { color: var(--ink); }
.btn--ghost::after {
  content: "";
  position: absolute;
  left: 6px;
  right: 6px;
  bottom: 8px;
  height: 1px;
  background: currentColor;
  transform: scaleX(.2);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.btn--ghost:hover::after { transform: scaleX(1); }

.btn--sm { min-height: 38px; padding: 0 16px; font-size: var(--fs-label); }

.btn:disabled,
.btn[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: .45;
  filter: grayscale(.8);
  box-shadow: none;
  transform: none;
  animation: none;
}

/* ---------- 7. Chip / Badge / Toggle ---------- */
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  backdrop-filter: blur(10px);
  font-size: var(--fs-label);
  font-weight: 500;
  line-height: 1.4;
  color: var(--ink);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.chip:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--g-purple) 60%, var(--line));
  background: var(--surface-strong);
}
.chip__k { color: var(--muted); }
.chip__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--g-cyan), var(--g-magenta));
  box-shadow: 0 0 10px var(--g-purple);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: var(--fs-label);
  font-weight: 500;
  letter-spacing: .06em;
  text-transform: uppercase;
  line-height: 1.4;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
}
.badge--aurora {
  color: #FFFFFF;
  border-color: transparent;
  background: linear-gradient(100deg, var(--g-blue), var(--g-purple) 55%, var(--g-magenta));
  background-size: 200% 200%;
  animation: gradient-shift calc(var(--animation-duration) * 1.3) ease-in-out infinite;
}
.badge--line-cyan { border-color: color-mix(in srgb, var(--g-cyan) 60%, transparent); color: var(--g-cyan); }
.badge--line-magenta { border-color: color-mix(in srgb, var(--g-magenta) 60%, transparent); color: var(--g-magenta); }

.toggle-row {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 44px;
  font-size: var(--fs-sub);
  color: var(--muted);
}

.switch {
  position: relative;
  display: inline-flex;
  align-items: center;
  width: 54px;
  height: 30px;
  flex: 0 0 auto;
}
.switch input {
  position: absolute;
  inset: 0;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}
.switch__track {
  position: absolute;
  inset: 0;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.switch__thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--muted);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.switch input:checked ~ .switch__track {
  background: linear-gradient(100deg, var(--g-blue), var(--g-purple), var(--g-magenta));
  border-color: transparent;
}
.switch input:checked ~ .switch__thumb {
  transform: translateX(24px);
  background: #FFFFFF;
  box-shadow: 0 4px 14px -4px rgba(0, 0, 0, .6);
}
.switch input:focus-visible ~ .switch__track { outline: 2px solid var(--g-cyan); outline-offset: 3px; }

/* ---------- 8. 卡片与网格 ---------- */
.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)); }

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  backdrop-filter: blur(14px) saturate(1.15);
  -webkit-backdrop-filter: blur(14px) saturate(1.15);
  overflow: hidden;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease), background var(--dur) var(--ease);
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(120deg, var(--g-cyan), var(--g-purple), var(--g-magenta));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  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(--dur) var(--ease);
  pointer-events: none;
}
.card::after {
  content: "";
  position: absolute;
  top: -60%;
  right: -30%;
  width: 70%;
  height: 120%;
  background: radial-gradient(circle at center, var(--glow), transparent 68%);
  opacity: 0;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
  transform: translateY(10%);
  pointer-events: none;
}
.card:hover {
  transform: translateY(-6px);
  background: var(--surface-strong);
  box-shadow: 0 24px 50px -24px var(--glow);
}
.card:hover::before { opacity: 1; }
.card:hover::after { opacity: .75; transform: translateY(0); }

.card__icon {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(140deg, color-mix(in srgb, var(--g-blue) 32%, transparent), color-mix(in srgb, var(--g-magenta) 26%, transparent));
  color: var(--ink);
}
.card__icon svg { width: 22px; height: 22px; }

.card__title,
.card__text,
.card__foot { position: relative; z-index: 1; }
.card__title { font-size: var(--fs-card); font-weight: 700; line-height: 1.3; }
.card__text { color: var(--muted); font-size: var(--fs-sub); line-height: 1.6; }
.card__foot { margin-top: auto; padding-top: 8px; }

.link-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  font-size: var(--fs-sub);
  font-weight: 500;
  color: var(--ink);
  transition: color var(--dur) var(--ease), gap var(--dur) var(--ease);
}
.link-more svg { width: 17px; height: 17px; transition: transform var(--dur) var(--ease); }
.link-more:hover { color: var(--g-cyan); }
.link-more:hover svg { transform: translateX(4px); }

/* ---------- 9. Hero ---------- */
.hero {
  position: relative;
  padding: 72px 0 56px;
  overflow: hidden;
}
.hero__inner {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 48px;
  align-items: center;
}
.hero__title {
  font-size: var(--fs-hero);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.03em;
  margin: 16px 0;
}
.hero__title .grad {
  background: linear-gradient(100deg, var(--g-cyan), var(--g-blue) 30%, var(--g-purple) 60%, var(--g-magenta) 85%, var(--g-cyan));
  background-size: 220% 220%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: gradient-shift var(--animation-duration) ease-in-out infinite;
}
.hero__sub {
  color: var(--muted);
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  line-height: 1.6;
  max-width: 34em;
  margin-bottom: 28px;
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}
.hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}
.hero__stat strong {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -.02em;
}
.hero__stat span { font-size: var(--fs-label); color: var(--muted); letter-spacing: .04em; }

/* Hero 纯 CSS 装饰视觉 */
.hero__visual {
  position: relative;
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
  isolation: isolate;
}
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(6px) saturate(1.3);
  mix-blend-mode: screen;
  opacity: .85;
}
.orb--1 {
  width: 62%;
  height: 62%;
  background: conic-gradient(from 0deg, var(--g-blue), var(--g-purple), var(--g-magenta), var(--g-cyan), var(--g-blue));
  animation: aurora-spin calc(var(--animation-duration) * 2) linear infinite;
  box-shadow: 0 0 90px -10px var(--g-purple);
}
.orb--2 {
  width: 40%;
  height: 40%;
  background: radial-gradient(circle at 35% 35%, var(--g-cyan), transparent 66%);
  animation: aurora-drift calc(var(--animation-duration) * 1.2) ease-in-out infinite alternate;
}
.glass-panel {
  position: relative;
  z-index: 2;
  width: 76%;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--bg) 55%, transparent);
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  box-shadow: 0 30px 60px -30px rgba(0, 0, 0, .8);
  display: grid;
  gap: 12px;
}
.glass-panel__bar {
  height: 10px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--g-cyan), var(--g-blue), var(--g-purple), var(--g-magenta));
  background-size: 200% 200%;
  animation: gradient-shift calc(var(--animation-duration) * 1.2) ease-in-out infinite;
}
.glass-panel__bar:nth-child(1) { width: 82%; }
.glass-panel__bar:nth-child(2) { width: 58%; animation-delay: -2s; }
.glass-panel__bar:nth-child(3) { width: 92%; animation-delay: -4s; }
.glass-panel__bar:nth-child(4) { width: 44%; animation-delay: -6s; }
.glass-panel__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 4px;
  font-size: var(--fs-label);
  color: var(--muted);
}

/* ---------- 10. 信息条 ---------- */
.info-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  backdrop-filter: blur(12px);
}

/* ---------- 11. 表单 ---------- */
.form {
  display: grid;
  gap: 18px;
}
.form__row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.field {
  display: grid;
  gap: 8px;
}
.field label {
  font-size: var(--fs-label);
  font-weight: 500;
  letter-spacing: .05em;
  color: var(--muted);
}
.field .req { color: var(--g-magenta); }

.field input,
.field textarea {
  width: 100%;
  min-height: 48px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .04);
  color: var(--ink);
  font-size: var(--fs-sub);
  line-height: 1.6;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), background var(--dur) var(--ease);
}
:root[data-theme="light"] .field input,
:root[data-theme="light"] .field textarea { background: rgba(255, 255, 255, .85); }

.field textarea { min-height: 132px; resize: vertical; }

.field input::placeholder,
.field textarea::placeholder { color: color-mix(in srgb, var(--muted) 72%, transparent); }

.field input:hover,
.field textarea:hover { border-color: color-mix(in srgb, var(--g-blue) 45%, var(--line)); }

.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--g-cyan);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--g-cyan) 26%, transparent), 0 0 24px -8px var(--g-purple);
}

.form__note { font-size: var(--fs-label); color: var(--muted); }

.alert {
  display: flex;
  gap: 12px;
  padding: 16px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--surface);
  font-size: var(--fs-sub);
}
.alert svg { width: 20px; height: 20px; flex: 0 0 auto; margin-top: 3px; }
.alert--ok { border-color: color-mix(in srgb, var(--g-cyan) 55%, transparent); }
.alert--ok svg { color: var(--g-cyan); }
.alert--err { border-color: color-mix(in srgb, var(--g-magenta) 55%, transparent); }
.alert--err svg { color: var(--g-magenta); }
.alert ul { margin-top: 6px; display: grid; gap: 4px; }
.alert li { color: var(--muted); }

/* ---------- 12. 面包屑 & 页面头 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block-start: 20px;
  font-size: var(--fs-label);
  color: var(--muted);
}
.breadcrumb a { color: var(--muted); transition: color var(--dur) var(--ease); }
.breadcrumb a:hover { color: var(--g-cyan); }
.breadcrumb [aria-current="page"] { color: var(--ink); }
.breadcrumb svg { width: 14px; height: 14px; opacity: .6; }

.page-head {
  padding: 32px 0 8px;
  display: grid;
  gap: 16px;
  max-width: 62ch;
}
.page-head h1 {
  font-size: clamp(1.75rem, 3.6vw, 2.75rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -.025em;
}

/* ---------- 13. 详情页排版 ---------- */
.detail {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}
.prose { display: grid; gap: 20px; }
.prose h2 { font-size: var(--fs-h2); font-weight: 700; line-height: 1.2; }
.prose p { color: var(--muted); line-height: 1.7; max-width: 34em; }

.checklist { display: grid; gap: 12px; }
.checklist li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: var(--fs-sub);
  line-height: 1.6;
}
.checklist svg {
  width: 20px;
  height: 20px;
  flex: 0 0 auto;
  margin-top: 3px;
  color: var(--g-cyan);
}

.aside-card {
  position: sticky;
  top: 92px;
  display: grid;
  gap: 16px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  backdrop-filter: blur(14px);
}
.aside-card h2 { font-size: var(--fs-card); }

.meta-list { display: grid; gap: 12px; font-size: var(--fs-sub); }
.meta-list > div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}
.meta-list > div:last-child { border-bottom: 0; padding-bottom: 0; }
.meta-list dt { color: var(--muted); }
.meta-list dd { margin: 0; text-align: right; }

/* ---------- 14. 时间线 ---------- */
.timeline { display: grid; gap: 24px; }
.timeline__item {
  position: relative;
  padding-left: 28px;
  display: grid;
  gap: 6px;
}
.timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--g-cyan), var(--g-magenta));
  box-shadow: 0 0 14px var(--g-purple);
}
.timeline__item::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 24px;
  bottom: -24px;
  width: 1px;
  background: var(--line);
}
.timeline__item:last-child::after { display: none; }
.timeline__item h3 { font-size: var(--fs-card); }
.timeline__item time { font-size: var(--fs-label); color: var(--muted); letter-spacing: .05em; }

/* ---------- 15. 区块背景变体 ---------- */
.band {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg-soft) 55%, transparent);
  backdrop-filter: blur(6px);
}

.cta-panel {
  position: relative;
  overflow: hidden;
  padding: 40px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  backdrop-filter: blur(16px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.cta-panel::after {
  content: "";
  position: absolute;
  inset: auto -10% -70% 40%;
  height: 220%;
  background: radial-gradient(circle at center, var(--glow), transparent 62%);
  pointer-events: none;
}
.cta-panel h2 { font-size: var(--fs-h2); }
.cta-panel .lead { margin-top: 8px; }

/* ---------- 16. 页脚 ---------- */
.site-footer {
  margin-top: 64px;
  border-top: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg-soft) 90%, transparent);
  backdrop-filter: blur(12px);
}
.site-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: 40px;
  padding: 48px 0 32px;
}
.site-footer__brand { display: grid; gap: 12px; max-width: 34ch; }
.site-footer h2 { font-size: var(--fs-label); letter-spacing: .16em; text-transform: uppercase; color: var(--muted); }
.site-footer__links { display: grid; gap: 4px; margin-top: 12px; }
.site-footer__links a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  font-size: var(--fs-sub);
  color: var(--muted);
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.site-footer__links a:hover { color: var(--ink); transform: translateX(4px); }
.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 20px 0 32px;
  border-top: 1px solid var(--line);
  font-size: var(--fs-label);
  color: var(--muted);
}
.site-footer__bottom a { transition: color var(--dur) var(--ease); }
.site-footer__bottom a:hover { color: var(--g-cyan); }

/* ---------- 17. 列表页过滤条 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}
.filter-bar .chip[aria-pressed="true"] {
  border-color: transparent;
  background: linear-gradient(100deg, var(--g-blue), var(--g-purple), var(--g-magenta));
  color: #fff;
}

/* ---------- 18. 响应式 ---------- */
@media (max-width: 1024px) {
  .hero__inner { grid-template-columns: 1fr; gap: 40px; }
  .hero__visual { max-width: 420px; margin-inline: auto; width: 100%; }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .detail { grid-template-columns: 1fr; }
  .aside-card { position: static; }
  .site-footer__inner { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 760px) {
  .container { padding: 0 16px; }
  .section { padding: 48px 0; }
  .hero { padding: 48px 0 40px; }

  .nav__burger { display: grid; }
  .nav__links {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 76px;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    margin: 0;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: color-mix(in srgb, var(--bg) 95%, transparent);
    backdrop-filter: blur(20px);
    box-shadow: 0 24px 50px -24px rgba(0, 0, 0, .8);
    display: none;
  }
  .nav__links[data-open="true"] { display: flex; }
  .nav__link { min-height: 48px; padding: 0 12px; }
  .nav__link[aria-current="page"]::after { display: none; }
  .nav__link[aria-current="page"] { background: var(--surface); }
  .nav__actions { margin-left: auto; }
  .nav__actions .btn { display: none; }

  .grid--3,
  .grid--2 { grid-template-columns: 1fr; }
  .form__row { grid-template-columns: 1fr; }
  .site-footer__inner { grid-template-columns: 1fr; }
  .cta-panel { padding: 24px; }
  .hero__stats { gap: 20px; }
  .card { padding: 20px; }
  .btn { min-height: 48px; }
}

/* ---------- 19. 工具类 ---------- */
.actions-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }

.prose h3 { font-size: 1.0625rem; font-weight: 700; }

/* ---------- 20. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .aurora__layer--a,
  .aurora__layer--b { animation: none; }
  .card:hover { transform: none; }
}