/* Ferry 官网样式。
 *
 * 没有构建步骤，没有框架，没有动画库 —— 一个卖点是「单静态二进制、零运行时」
 * 的项目，官网不该为了让卡片淡入而拉一个 27KB 的库。动效全部用原生 CSS 和
 * IntersectionObserver。
 *
 * 排版用 clamp() 做流式缩放，所以从 320px 手机到 4K 显示器是连续变化的，
 * 而不是在几个断点上跳。断点只用来改布局结构。
 */

:root {
  --bg: #070b14;
  --bg-soft: #0c1220;
  --panel: rgba(18, 26, 44, 0.72);
  --line: rgba(140, 170, 255, 0.14);
  --line-strong: rgba(140, 170, 255, 0.28);

  --text: #e8eeff;
  --muted: #97a6c7;
  --dim: #6b7a9c;

  --cyan: #38e8ff;
  --violet: #8b7bff;
  --mint: #4ee6a8;

  --grad: linear-gradient(110deg, var(--cyan), var(--violet));

  --radius: 16px;
  --radius-lg: 22px;
  --wrap: 1180px;

  --mono: ui-monospace, SFMono-Regular, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei", "Noto Sans SC", Roboto, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  /* 锚点跳转时给固定导航留出空间 */
  scroll-padding-top: 84px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: clamp(15px, 0.55vw + 13.4px, 17px);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
code { font-family: var(--mono); }

.wrap {
  width: min(100% - 2.5rem, var(--wrap));
  margin-inline: auto;
}

/* ── 极光背景 ─────────────────────────────────────────────────────────── */

.aurora {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  /* 背景不该拦截点击，也不该被读屏软件念出来 */
  pointer-events: none;
}

.blob {
  position: absolute;
  border-radius: 50%;
  /* 大半径模糊比多层渐变省 GPU，且在低端手机上不掉帧 */
  filter: blur(90px);
  opacity: 0.5;
  will-change: transform;
}

.blob-a {
  width: 46vmax; height: 46vmax;
  top: -16vmax; left: -10vmax;
  background: radial-gradient(circle, rgba(56, 232, 255, 0.55), transparent 68%);
  animation: drift-a 26s ease-in-out infinite alternate;
}
.blob-b {
  width: 40vmax; height: 40vmax;
  top: 4vmax; right: -14vmax;
  background: radial-gradient(circle, rgba(139, 123, 255, 0.55), transparent 68%);
  animation: drift-b 32s ease-in-out infinite alternate;
}
.blob-c {
  width: 34vmax; height: 34vmax;
  bottom: -12vmax; left: 32%;
  background: radial-gradient(circle, rgba(78, 230, 168, 0.32), transparent 68%);
  animation: drift-c 38s ease-in-out infinite alternate;
}

@keyframes drift-a { to { transform: translate3d(9vmax, 7vmax, 0) scale(1.12); } }
@keyframes drift-b { to { transform: translate3d(-11vmax, 9vmax, 0) scale(1.08); } }
@keyframes drift-c { to { transform: translate3d(7vmax, -8vmax, 0) scale(1.15); } }

/* 网格纹理，给深色背景一点「工程感」的质地 */
.grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 30%, transparent 78%);
  opacity: 0.35;
}

/* ── 导航 ─────────────────────────────────────────────────────────────── */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem clamp(1.25rem, 4vw, 2.5rem);
  background: rgba(7, 11, 20, 0.72);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background 0.3s;
}
.nav.stuck {
  border-bottom-color: var(--line);
  background: rgba(7, 11, 20, 0.88);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 650;
  font-size: 1.06rem;
  letter-spacing: -0.01em;
}
.mark { width: 26px; height: 26px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(0.8rem, 2vw, 1.6rem);
  font-size: 0.94rem;
  color: var(--muted);
}
.nav-links a { transition: color 0.2s; }
.nav-links a:hover { color: var(--text); }

.nav-cta {
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--text) !important;
}
.nav-cta:hover { border-color: var(--cyan); box-shadow: 0 0 20px rgba(56, 232, 255, 0.18); }

/* 手机上藏起次要链接，只留 GitHub —— 挤成两行比少两个锚点更糟 */
@media (max-width: 640px) {
  .nav-links a:not(.nav-cta) { display: none; }
}

/* ── Hero ─────────────────────────────────────────────────────────────── */

.hero { padding: clamp(3rem, 9vw, 7rem) 0 clamp(2rem, 5vw, 4rem); }

.hero-grid {
  display: grid;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

/* grid 与 flex 子项默认是 min-width:auto，也就是「不许收缩到内容的
 * min-content 以下」。里面那条 curl 安装命令是 nowrap 的，于是它会把整个
 * 列撑到比视口还宽，在手机上表现为整页可以左右拖动。
 * 显式写 min-width:0 才允许子项收缩，让内部的 overflow-x 真正生效。 */
.hero-grid > *,
.agents-grid > * { min-width: 0; }
/* 平板以上才并排，否则终端会被压得看不清 */
@media (min-width: 940px) {
  .hero-grid { grid-template-columns: 1fr 1fr; }
}

.eyebrow {
  margin: 0 0 1rem;
  font-size: 0.86rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--cyan);
}

h1 {
  margin: 0 0 1.2rem;
  font-size: clamp(2.5rem, 6.4vw, 4.4rem);
  line-height: 1.06;
  letter-spacing: -0.035em;
  font-weight: 700;
}
.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede {
  margin: 0 0 2rem;
  max-width: 34rem;
  color: var(--muted);
  font-size: clamp(1rem, 0.5vw + 0.9rem, 1.14rem);
}
.lede strong { color: var(--text); font-weight: 600; }

.install {
  display: flex;
  align-items: stretch;
  gap: 0.5rem;
  max-width: 34rem;
  padding: 0.55rem 0.55rem 0.55rem 1rem;
  background: var(--panel);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
}
.install code {
  flex: 1;
  min-width: 0;
  align-self: center;
  font-size: clamp(0.76rem, 1.9vw, 0.9rem);
  color: var(--text);
  /* 命令太长时横向滚动，而不是撑破卡片 */
  overflow-x: auto;
  white-space: nowrap;
  scrollbar-width: none;
}
.install code::-webkit-scrollbar { display: none; }

.copy {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.85rem;
  background: rgba(56, 232, 255, 0.1);
  border: 1px solid var(--line-strong);
  border-radius: 11px;
  color: var(--text);
  font: inherit;
  font-size: 0.84rem;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, transform 0.1s;
}
.copy:hover { background: rgba(56, 232, 255, 0.2); border-color: var(--cyan); }
.copy:active { transform: scale(0.96); }
.copy.done { background: rgba(78, 230, 168, 0.18); border-color: var(--mint); }
.copy svg {
  width: 15px; height: 15px;
  fill: none; stroke: currentColor; stroke-width: 1.8;
  stroke-linecap: round; stroke-linejoin: round;
}
@media (max-width: 480px) { .copy-label { display: none; } }

.install-note {
  margin: 0.9rem 0 0;
  font-size: 0.86rem;
  color: var(--dim);
}

/* ── 终端 ─────────────────────────────────────────────────────────────── */

.terminal {
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background: rgba(6, 10, 18, 0.9);
  box-shadow: 0 30px 80px -30px rgba(0, 0, 0, 0.9), 0 0 60px -20px rgba(139, 123, 255, 0.3);
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.term-bar {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
}
.dot { width: 11px; height: 11px; border-radius: 50%; background: #2a3550; }
.dot:nth-child(1) { background: #ff5f57; }
.dot:nth-child(2) { background: #febc2e; }
.dot:nth-child(3) { background: #28c840; }
.term-title {
  margin-left: auto;
  font-size: 0.76rem;
  color: var(--dim);
  font-family: var(--mono);
}

.term-body {
  margin: 0;
  padding: 1.15rem 1.25rem 1.5rem;
  font-family: var(--mono);
  font-size: clamp(0.74rem, 1.7vw, 0.88rem);
  line-height: 1.85;
  /* 高度固定，避免打字时页面不停抖动 */
  min-height: 15.5rem;
  white-space: pre-wrap;
  word-break: break-all;
}
.term-body .prompt { color: var(--mint); }
.term-body .cmd { color: var(--text); }
.term-body .url { color: var(--cyan); }
.term-body .note { color: var(--dim); }

.cursor {
  display: inline-block;
  width: 8px;
  height: 1.05em;
  vertical-align: text-bottom;
  background: var(--cyan);
  animation: blink 1.05s steps(2, start) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ── 数据条 ───────────────────────────────────────────────────────────── */

.strip {
  padding: clamp(1.5rem, 4vw, 2.5rem) 0;
  border-block: 1px solid var(--line);
  background: rgba(10, 15, 26, 0.5);
  backdrop-filter: blur(8px);
}
.strip-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(1rem, 3vw, 2rem);
  text-align: center;
}
@media (min-width: 760px) { .strip-grid { grid-template-columns: repeat(4, 1fr); } }

.stat { display: flex; flex-direction: column; gap: 0.15rem; }
.stat-k {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat-v { font-size: 0.84rem; color: var(--muted); }

/* ── 通用小节 ─────────────────────────────────────────────────────────── */

.section { padding: clamp(3.5rem, 9vw, 7rem) 0; }
.section.alt { background: rgba(10, 15, 26, 0.42); border-block: 1px solid var(--line); }

h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.75rem, 3.6vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -0.028em;
  font-weight: 680;
}

.section-lede {
  margin: 0 0 clamp(2rem, 4vw, 3rem);
  max-width: 46rem;
  color: var(--muted);
}
.section-lede strong { color: var(--text); }
.section-lede code, .ticks code, .card code {
  padding: 0.1em 0.4em;
  background: rgba(139, 123, 255, 0.14);
  border-radius: 5px;
  font-size: 0.9em;
  color: var(--text);
}

/* ── 流程图 ───────────────────────────────────────────────────────────── */

.flow {
  display: grid;
  gap: 0.5rem;
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
  grid-template-columns: 1fr;
}
/* 手机上竖排，箭头转 90 度；平板起横排 */
@media (min-width: 820px) {
  .flow { grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr; align-items: center; }
}

.flow-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  padding: 1.1rem 0.9rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-align: center;
  transition: border-color 0.3s, transform 0.3s;
}
.flow-node:hover { border-color: var(--line-strong); transform: translateY(-3px); }
.flow-node.accent {
  border-color: rgba(56, 232, 255, 0.4);
  box-shadow: 0 0 40px -12px rgba(56, 232, 255, 0.5);
}
.flow-ico { font-size: 1.5rem; line-height: 1; }
.flow-node strong { font-size: 0.98rem; }
.flow-node em { font-style: normal; font-size: 0.8rem; color: var(--dim); }

.flow-arrow {
  position: relative;
  height: 26px;
  display: grid;
  place-items: center;
}
.flow-arrow::before {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  width: 2px;
  height: 100%;
  background: linear-gradient(var(--line-strong), transparent);
}
.pulse {
  position: absolute;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px var(--cyan);
  animation: flow-down 2.2s ease-in-out infinite;
}
@keyframes flow-down {
  0%   { transform: translateY(-13px); opacity: 0; }
  30%  { opacity: 1; }
  100% { transform: translateY(13px); opacity: 0; }
}

@media (min-width: 820px) {
  .flow-arrow { height: auto; width: 40px; }
  .flow-arrow::before { width: 100%; height: 2px; background: linear-gradient(90deg, var(--line-strong), transparent); }
  @keyframes flow-down {
    0%   { transform: translateX(-20px); opacity: 0; }
    30%  { opacity: 1; }
    100% { transform: translateX(20px); opacity: 0; }
  }
}

/* ── 卡片 ─────────────────────────────────────────────────────────────── */

.cards {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}
@media (min-width: 700px)  { .cards { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1080px) { .cards { grid-template-columns: repeat(4, 1fr); } }

.card {
  position: relative;
  padding: 1.5rem 1.35rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
  overflow: hidden;
  transition: border-color 0.3s, transform 0.3s;
}
/* 顶部一道渐变高光，hover 时点亮 */
.card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 1px;
  background: var(--grad);
  opacity: 0;
  transition: opacity 0.3s;
}
.card:hover { border-color: var(--line-strong); transform: translateY(-4px); }
.card:hover::before { opacity: 1; }
.card h3 { margin: 0 0 0.5rem; font-size: 1.04rem; font-weight: 620; }
.card p { margin: 0; font-size: 0.92rem; color: var(--muted); }
.card strong { color: var(--text); }

/* ── Agent 小节 ───────────────────────────────────────────────────────── */

.agents-grid { display: grid; gap: clamp(2rem, 5vw, 3.5rem); align-items: center; }
@media (min-width: 940px) { .agents-grid { grid-template-columns: 1.05fr 1fr; } }

.ticks { margin: 0; padding: 0; list-style: none; display: grid; gap: 0.7rem; }
.ticks li {
  position: relative;
  padding-left: 1.75rem;
  color: var(--muted);
  font-size: 0.96rem;
}
.ticks li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.55em;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--grad);
  box-shadow: 0 0 10px rgba(56, 232, 255, 0.6);
}
.ticks strong { color: var(--text); }

.code-card {
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background: rgba(6, 10, 18, 0.86);
  overflow: hidden;
  box-shadow: 0 24px 60px -30px rgba(0, 0, 0, 0.9);
}
.code-head {
  padding: 0.7rem 1.1rem;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--dim);
}
.code-card pre, .cta-code pre {
  margin: 0;
  padding: 1.15rem 1.25rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: clamp(0.76rem, 1.7vw, 0.88rem);
  line-height: 1.8;
}
.code-card .k { color: var(--cyan); }
.code-card .s { color: var(--mint); }
.code-card .p { color: var(--dim); }

/* ── 表格 ─────────────────────────────────────────────────────────────── */

.table-wrap {
  /* 窄屏时表格自己横向滚动，绝不让整页横滚 */
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  backdrop-filter: blur(8px);
  -webkit-overflow-scrolling: touch;
}
table { width: 100%; border-collapse: collapse; min-width: 30rem; }
th, td { padding: 0.85rem 1.1rem; text-align: left; font-size: 0.93rem; }
thead th {
  border-bottom: 1px solid var(--line-strong);
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
}
.th-note {
  display: block;
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--dim);
}
tbody tr { border-top: 1px solid var(--line); }
tbody td:first-child { color: var(--muted); }
th:not(:first-child), td:not(:first-child) { text-align: center; width: 8.5rem; }
.yes, .no { font-size: 1rem; }
.no { opacity: 0.45; }

.pledge {
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  padding: 1.2rem 1.5rem;
  border-left: 3px solid transparent;
  border-image: var(--grad) 1;
  background: rgba(139, 123, 255, 0.08);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  font-weight: 550;
}

/* ── 结尾 CTA ─────────────────────────────────────────────────────────── */

.cta { padding: clamp(3.5rem, 9vw, 7rem) 0; text-align: center; }
.cta h2 { margin-bottom: 2rem; }

.cta-code {
  max-width: 44rem;
  margin: 0 auto 2rem;
  text-align: left;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background: rgba(6, 10, 18, 0.86);
  box-shadow: 0 24px 60px -30px rgba(0, 0, 0, 0.9);
}
.cta-code .c { color: var(--dim); }

.cta-links { display: flex; flex-wrap: wrap; gap: 0.75rem; justify-content: center; }
.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.7rem 1.5rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 550;
  transition: transform 0.15s, box-shadow 0.25s, border-color 0.25s;
}
.btn:hover { transform: translateY(-2px); border-color: var(--cyan); }
.btn.primary {
  background: var(--grad);
  border-color: transparent;
  color: #05080f;
}
.btn.primary:hover { box-shadow: 0 12px 34px -10px rgba(56, 232, 255, 0.6); }

/* ── 页脚 ─────────────────────────────────────────────────────────────── */

.foot {
  padding: 2.5rem 0;
  border-top: 1px solid var(--line);
  color: var(--dim);
  font-size: 0.88rem;
}
.foot-grid { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; align-items: center; }
.foot nav { display: flex; flex-wrap: wrap; gap: 1.25rem; }
.foot a:hover { color: var(--text); }
.foot p { margin: 0; }

/* ── 滚动揭示 ─────────────────────────────────────────────────────────── */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.in { opacity: 1; transform: none; }

/* 同一容器内的元素依次进场，靠 CSS 变量传递序号 */
.reveal { transition-delay: calc(var(--i, 0) * 70ms); }

/* JS 没跑起来时（禁用脚本、加载失败）内容必须照常可见 */
.no-js .reveal { opacity: 1; transform: none; }

/* ── 无障碍与降级 ─────────────────────────────────────────────────────── */

:where(a, button):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

/* 尊重系统的「减少动态效果」。这不是可选项：前庭功能障碍的用户会因为
 * 大面积位移动画产生眩晕。 */
@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;
  }
  .reveal { opacity: 1; transform: none; }
  .blob { animation: none; }
}

/* 浅色系统偏好下也保持深色 —— 这是刻意的品牌选择，但把对比度调高一点，
 * 因为浅色环境下屏幕通常更亮。 */
@media (prefers-color-scheme: light) {
  :root { --muted: #a4b2d0; --dim: #7a89ab; }
}