/* ==========================================================================
   NeoLinks 官网 · 基础层
   重置、排版、全局背景、页头页脚、容器与栅格。
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.68;
  color: var(--ink);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* 全站底色：极轻的垂直渐变，让长页面有呼吸 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background:
    radial-gradient(90% 60% at 50% -10%, var(--aurora-cream) 0%, transparent 60%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg) 55%, var(--bg-deep) 100%);
}

/* 极细噪点：抵消大面积渐变的塑料感 */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: var(--grain-opacity);
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='140' height='140'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='3' stitchTiles='stitch'/><feColorMatrix type='saturate' values='0'/></filter><rect width='140' height='140' filter='url(%23n)'/></svg>");
  background-size: 140px 140px;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

::selection {
  background: color-mix(in srgb, var(--sky) 45%, transparent);
  color: var(--ink);
}

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: var(--r-badge);
}

/* ---------- 排版 ---------- */

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 740;
  line-height: 1.06;
  letter-spacing: -.034em;
  color: var(--ink);
  text-wrap: balance;
}

h1 {
  font-size: var(--fs-display);
  font-weight: 800;
  letter-spacing: -.042em;
}

h2 {
  font-size: var(--fs-h2);
}

h3 {
  font-size: var(--fs-h3);
  line-height: 1.25;
  letter-spacing: -.02em;
  font-weight: 700;
}

p {
  margin: 0;
  text-wrap: pretty;
}

.lead {
  font-size: var(--fs-lead);
  color: var(--muted);
  line-height: 1.72;
}

.muted {
  color: var(--muted);
}

/* ---------- 布局 ---------- */

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

.section {
  padding-block: clamp(72px, 9vw, 132px);
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.62fr);
  gap: clamp(24px, 5vw, 72px);
  align-items: end;
  margin-bottom: clamp(40px, 5vw, 68px);
}

.section-head-side {
  color: var(--muted);
  font-size: var(--fs-sm);
  max-width: 42ch;
  justify-self: end;
}

@media (max-width: 860px) {
  .section-head {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .section-head-side {
    justify-self: start;
  }
}

/* ---------- 小标签 ---------- */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-size: var(--fs-xs);
  font-weight: 640;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}

.eyebrow-line::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: .5;
}

.eyebrow-num {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .02em;
  color: var(--accent);
  opacity: .8;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--grass-deep);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--grass) 26%, transparent);
  animation: dotPulse 3.4s var(--ease-soft) infinite;
}

@keyframes dotPulse {
  0%, 100% { box-shadow: 0 0 0 3px color-mix(in srgb, var(--grass) 22%, transparent); }
  50% { box-shadow: 0 0 0 7px color-mix(in srgb, var(--grass) 10%, transparent); }
}

/* ---------- 跳转链接 ---------- */

.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 100;
  padding: 10px 18px;
  border-radius: var(--r-pill);
  background: var(--cta-bg);
  color: var(--cta-ink);
  font-size: var(--fs-sm);
  transition: top var(--dur-2) var(--ease-out);
}

.skip-link:focus-visible {
  top: 14px;
}

/* ---------- 页头 ---------- */

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: var(--z-header);
  padding: 14px 0;
  transition: padding var(--dur-2) var(--ease-out);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  height: 62px;
  padding: 0 10px 0 16px;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  transition:
    background var(--dur-2) var(--ease-out),
    border-color var(--dur-2) var(--ease-out),
    box-shadow var(--dur-2) var(--ease-out),
    height var(--dur-2) var(--ease-out);
}

.site-header.is-scrolled {
  padding: 8px 0;
}

.site-header.is-scrolled .nav {
  height: 56px;
  background: var(--glass-bg);
  border-color: var(--line-glass);
  box-shadow: var(--shadow-md);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 750;
  letter-spacing: -.03em;
  font-size: 1.06rem;
  flex: none;
}

.brand-icon {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  box-shadow: 0 6px 14px -6px rgba(12, 40, 60, .5);
  transition: transform var(--dur-2) var(--ease-spring);
}

.brand:hover .brand-icon {
  transform: rotate(-6deg) scale(1.06);
}

.brand-name .brand-neo {
  color: var(--ink);
}

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

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link {
  position: relative;
  padding: 9px 14px;
  border-radius: var(--r-pill);
  font-size: var(--fs-sm);
  color: var(--muted);
  transition: color var(--dur-1) var(--ease-out), background var(--dur-1) var(--ease-out);
}

.nav-link:hover {
  color: var(--ink);
  background: color-mix(in srgb, var(--ink) 5%, transparent);
}

.nav-download {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-left: 8px;
  padding: 10px 18px;
  border-radius: var(--r-pill);
  background: var(--cta-bg);
  color: var(--cta-ink);
  font-size: var(--fs-sm);
  font-weight: 600;
  box-shadow: var(--cta-shadow);
  transition: transform var(--dur-2) var(--ease-spring), background var(--dur-2) var(--ease-out);
}

.nav-download:hover {
  background: var(--cta-bg-hover);
  transform: translateY(-1px);
}

.nav-download span {
  transition: transform var(--dur-2) var(--ease-out);
}

.nav-download:hover span {
  transform: translate(2px, -2px);
}

@media (max-width: 760px) {
  .nav-link {
    display: none;
  }

  .nav-link.is-essential {
    display: inline-flex;
  }
}

/* ---------- 页脚 ---------- */

.site-footer {
  position: relative;
  margin-top: clamp(48px, 6vw, 96px);
  padding: clamp(56px, 7vw, 88px) 0 40px;
  border-top: 1px solid var(--line);
}

.footer-simple {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  font-size: var(--fs-sm);
  color: var(--muted);
}

.footer-records {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 5px;
}

.footer-record-sep {
  color: var(--muted-soft);
}

@media (max-width: 760px) {
  /* 窄屏两条备案各占一行，避免分隔符与备案号被拆到不同行 */
  .footer-records {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .footer-record-sep {
    display: none;
  }
}

.footer-records a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--muted);
  border-bottom: 1px solid transparent;
  transition: color var(--dur-1) var(--ease-out), border-color var(--dur-1) var(--ease-out);
}

/* 公安备案号旁的官方图标：保持原图比例，不参与文字基线对齐 */
.footer-record-icon {
  width: 18px;
  height: 20px;
  flex: none;
  object-fit: contain;
  image-rendering: -webkit-optimize-contrast;
}

.footer-records a:hover {
  color: var(--ink);
  border-color: currentColor;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-5);
}

.footer-links a {
  color: var(--muted);
  transition: color var(--dur-1) var(--ease-out);
}

.footer-links a:hover {
  color: var(--ink);
}

.footer-top-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
}

.footer-top-link span {
  transition: transform var(--dur-2) var(--ease-out);
}

.footer-top-link:hover {
  color: var(--ink);
}

.footer-top-link:hover span {
  transform: translateY(-3px);
}

/* 页脚品牌大字：整页收尾的视觉重量 */
.footer-mark {
  display: block;
  margin-bottom: clamp(28px, 4vw, 44px);
  font-size: clamp(3.4rem, 13vw, 11rem);
  font-weight: 800;
  line-height: .82;
  letter-spacing: -.055em;
  background: linear-gradient(180deg, var(--ink) 0%, color-mix(in srgb, var(--ink) 22%, transparent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  user-select: none;
}

/* ---------- 长文（隐私政策） ---------- */

.prose-page {
  position: relative;
  max-width: var(--container-narrow);
  padding-top: clamp(96px, 9vw, 124px);
}

/* 隐私页顶部的一层柔光，避免长文页过于干瘪 */
.prose-page::before {
  content: "";
  position: absolute;
  top: -60px;
  left: -14%;
  width: 78%;
  height: 340px;
  z-index: -1;
  background: radial-gradient(50% 50% at 50% 50%, var(--halo), transparent 70%);
  filter: blur(56px);
  opacity: .55;
  pointer-events: none;
}

.prose h1 {
  font-size: clamp(2.4rem, 4.4vw, 3.6rem);
  margin-bottom: var(--sp-4);
}

.prose .lead {
  margin-bottom: var(--sp-10);
}

.prose section {
  padding-block: var(--sp-6);
  border-top: 1px solid var(--line);
}

.prose h2 {
  font-size: 1.12rem;
  letter-spacing: -.01em;
  margin-bottom: var(--sp-3);
}

.prose p {
  color: var(--muted);
  margin-bottom: var(--sp-3);
}

.prose a {
  color: var(--accent);
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 34%, transparent);
}

/* ---------- 无障碍 ---------- */

.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;
}

/* ---------- 进入动效基础 ----------
   默认可见；只有脚本真正接管后（html.reveal-ready）才隐藏待入场元素，
   脚本异常或关闭 JS 时页面照常可读。 */

.reveal-ready [data-reveal] {
  opacity: 0;
  transform: translate3d(0, 26px, 0);
  transition:
    opacity .85s var(--ease-out) var(--reveal-delay, 0ms),
    transform .95s var(--ease-out) var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}

.reveal-ready [data-reveal="left"] {
  transform: translate3d(-32px, 0, 0);
}

.reveal-ready [data-reveal="right"] {
  transform: translate3d(32px, 0, 0);
}

.reveal-ready [data-reveal="scale"] {
  transform: scale(.94);
}

.reveal-ready [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

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

  .reveal-ready [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}