/* ==========================================================================
   shangxiawen.me · 黑场设计系统（全站唯一风格）
   --------------------------------------------------------------------------
   一种底：墨黑 + 微观布朗波背景（GIF→H.264），全站统一
   一种强调色：玉青 #7FB79B（与 logo 原稿深绿同系），其余全部奶油白透明度梯度
   一种卡片：半透明墨色 + 1px 细边线，无阴影
   字体：英文 Apple 系统字体（SF Pro），中文 PingFang SC
   ========================================================================== */

:root {
  --bg:      #101815;   /* 墨绿黑（与 logo 原稿深绿同系） */
  --fg:      #FAF9F5;
  --fg-2:    rgba(250,249,245,0.70);
  --fg-3:    rgba(250,249,245,0.45);
  --line:    rgba(250,249,245,0.13);
  --line-soft: rgba(250,249,245,0.07);
  --card:    rgba(14,22,19,0.62);
  --card-2:  rgba(14,22,19,0.45);
  --scrim:   rgba(13,21,18,0.52);

  --accent:      #7FB79B;   /* 玉青 */
  --accent-lt:   #A6CDB8;   /* 小字号提亮 */
  --accent-hover:#93C5AB;
  --accent-ink:  #0F1A15;   /* 玉青底上的深字 */

  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 20px;

  --pad-x: clamp(22px, 4.4vw, 76px);
  --max-w: 1160px;

  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
          "Segoe UI", "Helvetica Neue", "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

.wrap { max-width: var(--max-w); margin: 0 auto; padding: 0 var(--pad-x); position: relative; z-index: 10; }
a { color: inherit; }

/* ---------- 背景层：全站统一的布朗波 ---------- */
.bg { position: fixed; inset: 0; z-index: 0; background: var(--bg); }
.bg video { width: 100%; height: 100%; object-fit: cover; display: block; }
.bg .scrim { position: absolute; inset: 0; background: var(--scrim); }

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  background: rgba(11,18,15,0.42);
  border-bottom: 1px solid transparent;
  transition: background .25s ease, border-color .25s ease;
}
.nav.scrolled {
  background: rgba(11,18,15,0.90);
  border-bottom-color: var(--line);
}
.nav-inner {
  max-width: var(--max-w); margin: 0 auto; padding: 0 var(--pad-x);
  height: 64px;
  display: flex; align-items: center; gap: 26px;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  text-decoration: none; flex-shrink: 0;
  font-size: 16.5px; font-weight: 500; letter-spacing: -0.015em;
}
.brand .mk { display: block; flex-shrink: 0; }
.links { display: flex; gap: 4px; margin-left: 6px; }
.links a {
  font-size: 14px; color: var(--fg-2); text-decoration: none;
  padding: 7px 13px; border-radius: 999px;
  transition: background .16s ease, color .16s ease;
}
.links a:hover { background: rgba(250,249,245,0.09); color: var(--fg); }
.links a.active { background: rgba(250,249,245,0.13); color: var(--fg); }
.nav-right { margin-left: auto; flex-shrink: 0; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 500; text-decoration: none;
  padding: 12px 24px; border-radius: 999px;
  border: 1px solid transparent;
  transition: background .16s ease, border-color .16s ease;
}
.btn-sm { font-size: 13.5px; padding: 8px 17px; }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: var(--accent-hover); }
.btn-ghost { color: var(--fg); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--fg-3); }
.btn-ink { background: var(--fg); color: var(--bg); }
.btn-ink:hover { background: #fff; }

/* ---------- Hero（仅首页） ---------- */
.hero {
  position: relative; z-index: 10;
  min-height: 92svh;
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: 130px 0 84px;
}
.hero .pill {
  display: inline-flex; align-items: center; gap: 9px; align-self: flex-start;
  font-size: 13px; font-weight: 500;
  padding: 7px 15px 7px 10px; border-radius: 999px;
  background: rgba(250,249,245,0.10); border: 1px solid var(--line);
  color: var(--fg); text-decoration: none; margin-bottom: 26px;
  transition: background .16s ease;
}
.hero .pill:hover { background: rgba(250,249,245,0.18); }
.hero .pill .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent-lt); }
.hero h1 {
  font-size: clamp(38px, 5.4vw, 72px);
  font-weight: 500; line-height: 1.07; letter-spacing: -0.03em;
  margin: 0 0 22px; max-width: 17em;
}
.hero .lede {
  font-size: clamp(16px, 1.3vw, 19px); line-height: 1.62;
  color: var(--fg-2); max-width: 42em; margin: 0 0 32px;
}
.hero .lede strong { font-weight: 500; color: var(--fg); }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-meta {
  margin-top: 56px; padding-top: 20px;
  border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap;
  font-size: 12.5px; color: var(--fg-3);
}
.hero-meta .mono { font-family: var(--mono); }

/* ---------- 内页标题 ---------- */
.page-head { padding: 148px 0 56px; }
.page-head .kicker { margin-bottom: 16px; }
.page-head h1 {
  font-size: clamp(32px, 4.2vw, 54px);
  font-weight: 500; line-height: 1.1; letter-spacing: -0.03em;
  margin: 0 0 18px; max-width: 20em;
}
.page-head .lede { font-size: clamp(15.5px,1.15vw,18px); color: var(--fg-2); max-width: 44em; margin: 0; }
.page-head .lede strong { font-weight: 500; color: var(--fg); }

/* ---------- 区块 ---------- */
.sec { padding: clamp(52px, 7vh, 88px) 0; }
.sec + .sec { border-top: 1px solid var(--line-soft); }
.sec-head { margin-bottom: 34px; }
.kicker {
  font-family: var(--mono);
  font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent-lt); margin: 0 0 14px;
}
h2 {
  font-size: clamp(26px, 2.9vw, 38px);
  font-weight: 500; line-height: 1.16; letter-spacing: -0.026em;
  margin: 0 0 14px; max-width: 24em;
}
.lede { font-size: clamp(15px,1.1vw,17.5px); color: var(--fg-2); max-width: 46em; margin: 0 0 36px; }
.lede strong { font-weight: 500; color: var(--fg); }
.more {
  display: inline-block; margin-top: 22px;
  font-size: 14px; font-weight: 500; text-decoration: none; color: var(--fg);
  border-bottom: 1px solid var(--line); padding-bottom: 2px;
}
.more:hover { border-bottom-color: var(--accent-lt); }

/* ---------- 卡片（唯一一种） ---------- */
.grid { display: grid; gap: 14px; }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 24px 26px 26px;
  display: flex; flex-direction: column;
  transition: border-color .2s ease, transform .2s ease;
}
a.card { text-decoration: none; }
a.card:hover { border-color: rgba(250,249,245,0.28); transform: translateY(-2px); }
.card .label {
  font-family: var(--mono); font-size: 11.5px;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent-lt); margin-bottom: 12px;
}
.card h3 { font-size: 17.5px; font-weight: 500; letter-spacing: -0.018em; margin: 0 0 8px; }
.card h3 .en { font-family: var(--mono); font-size: 12px; color: var(--fg-3); margin-left: 8px; font-weight: 400; }
.card p { margin: 0; font-size: 14.5px; line-height: 1.72; color: var(--fg-2); }
.card p strong { font-weight: 500; color: var(--fg); }
.card .more { margin: 14px 0 0; font-size: 13.5px; }
.card .more:hover { border-bottom-color: var(--accent-lt); }

/* ---------- 表格 ---------- */
.table-wrap {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--r-md); overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.tb { width: 100%; min-width: 580px; border-collapse: collapse; font-size: 14.5px; }
.tb th {
  text-align: left; font-weight: 500; font-size: 11.5px;
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--fg-3);
  font-family: var(--mono);
  padding: 14px 22px; border-bottom: 1px solid var(--line);
}
.tb td { padding: 18px 22px; border-bottom: 1px solid var(--line-soft); color: var(--fg-2); vertical-align: top; }
.tb tr:last-child td { border-bottom: none; }
.tb .strong { font-weight: 500; color: var(--fg); white-space: nowrap; }
.tb .en { font-family: var(--mono); font-size: 13px; color: var(--fg-3); white-space: nowrap; }

/* ---------- Callout ---------- */
.callout {
  background: var(--card); border: 1px solid var(--line);
  border-left: 2px solid var(--accent);
  border-radius: var(--r-md);
  padding: 22px 26px; margin-top: 18px;
}
.callout p { margin: 0 0 9px; font-size: 15px; color: var(--fg-2); }
.callout p:last-child { margin-bottom: 0; }
.callout strong { font-weight: 500; color: var(--fg); }
.callout .term { font-family: var(--mono); font-size: 13px; color: var(--accent-lt); margin-right: 10px; }

/* ---------- 三层架构 ---------- */
.stack { display: flex; flex-direction: column; gap: 12px; }
.stack-row {
  display: grid; grid-template-columns: 200px 1fr; gap: 26px;
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--r-md); padding: 24px 26px;
}
.stack-lbl { display: flex; flex-direction: column; gap: 4px; }
.stack-num { font-family: var(--mono); font-size: 12px; color: var(--accent-lt); }
.stack-name { font-size: 17.5px; font-weight: 500; letter-spacing: -0.018em; }
.stack-en { font-family: var(--mono); font-size: 12px; color: var(--fg-3); }
.stack-body p { margin: 0 0 7px; font-size: 14.5px; color: var(--fg-2); }
.stack-body p:last-child { margin-bottom: 0; }
.stack-note { font-size: 13px !important; color: var(--fg-3) !important; font-family: var(--mono); }
.stack-arrow { text-align: center; font-size: 12.5px; color: var(--fg-3); font-family: var(--mono); padding: 0; }

/* ---------- 路线图 ---------- */
.roadmap { display: flex; flex-direction: column; gap: 12px; }
.rm {
  display: grid; grid-template-columns: 82px 190px 1fr; gap: 24px; align-items: baseline;
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--r-md); padding: 20px 26px;
}
.rm.now { border-color: rgba(127,183,155,0.45); }
.rm .ver { font-family: var(--mono); font-size: 13px; color: var(--accent-lt); }
.rm .name { font-size: 16px; font-weight: 500; letter-spacing: -0.015em; }
.rm .note { font-size: 14px; color: var(--fg-2); }

/* ---------- Chips ---------- */
.chips { display: grid; grid-template-columns: repeat(4, 1fr); gap: 11px; }
.chip {
  font-family: var(--mono); font-size: 12.5px; color: var(--fg-2);
  background: var(--card-2); border: 1px solid var(--line);
  border-radius: var(--r-sm); padding: 12px 15px;
}

/* ---------- 页脚 ---------- */
.foot {
  border-top: 1px solid var(--line);
  padding: 52px 0 30px; margin-top: 26px;
}
.foot-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 32px; }
.foot .fb {
  display: flex; align-items: center; gap: 10px;
  font-size: 17px; font-weight: 500; letter-spacing: -0.015em; margin: 0 0 10px;
}
.foot .fb .mk { display: block; }
.foot .fn { margin: 0; font-size: 13px; color: var(--fg-3); line-height: 1.65; }
.foot h4 {
  font-family: var(--mono);
  font-size: 11.5px; font-weight: 500; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--fg-3); margin: 0 0 14px;
}
.foot ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 9px; }
.foot ul a { font-size: 14px; color: var(--fg-2); text-decoration: none; }
.foot ul a:hover { color: var(--fg); }
.foot-base {
  margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--line-soft);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  font-size: 12.5px; color: var(--fg-3);
}

/* ---------- 进场动效 ---------- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .7s cubic-bezier(.22,.61,.36,1), transform .7s cubic-bezier(.22,.61,.36,1); }
.reveal.in { opacity: 1; transform: none; }
.hero .pill, .hero h1, .hero .lede, .hero-cta { opacity: 0; animation: rise .8s cubic-bezier(.22,.61,.36,1) forwards; }
.hero h1 { animation-delay: .07s; }
.hero .lede { animation-delay: .18s; }
.hero-cta { animation-delay: .3s; }
@keyframes rise { to { opacity: 1; transform: none; } }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .g3 { grid-template-columns: 1fr; }
  .g2 { grid-template-columns: 1fr; }
  .chips { grid-template-columns: repeat(2, 1fr); }
  .stack-row { grid-template-columns: 1fr; gap: 10px; }
  .rm { grid-template-columns: 68px 1fr; }
  .rm .note { grid-column: 1 / -1; }
  .foot-grid { grid-template-columns: 1fr; gap: 26px; }
  .nav-inner { height: auto; flex-wrap: wrap; padding-top: 11px; padding-bottom: 11px; row-gap: 6px; }
  .links { order: 3; width: 100%; margin-left: 0; overflow-x: auto; }
  .links::-webkit-scrollbar { display: none; }
  .hero { min-height: 86svh; }
}
@media (max-width: 520px) {
  .chips { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .bg video { display: none; }
  .bg { background-image: var(--poster, none); background-size: cover; background-position: center; }
  .reveal, .hero .pill, .hero h1, .hero .lede, .hero-cta { animation: none !important; opacity: 1 !important; transform: none !important; transition: none !important; }
}