/* ==========================================================================
   Chaeco — unified project website styles
   深蓝黑底 + 数据青 + 动作琥珀 · Space Grotesk + JetBrains Mono
   Shared across all @chaeco/* project websites.
   ========================================================================== */

/* ── Design tokens ──────────────────────────────────────────────────────── */

:root {
  --bg:          #0b0f14;
  --bg-surface:  #111826;
  --bg-raised:   #151d2c;
  --line:        rgba(148, 163, 184, 0.14);
  --line-strong: rgba(148, 163, 184, 0.28);

  --text:        #e6edf3;
  --text-dim:    #8b98a5;
  --text-faint:  #5c6a78;

  --accent-data: #22d3ee;   /* 数据 / 代码 / 结果 */
  --accent-act:  #f59e0b;   /* 动作 / 绑定参数 */
  --ok:          #34d399;
  --err:         #f87171;

  --font-display: "Space Grotesk", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body:    -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --radius: 10px;
  --radius-sm: 6px;
  --maxw: 1120px;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 0.7s;

  --nav-h: 64px;
}

/* ── Reset & base ──────────────────────────────────────────────────────── */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 12px);
}

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

::selection { background: rgba(34, 211, 238, 0.25); color: #fff; }

a { color: var(--accent-data); text-decoration: none; }
a:hover { text-decoration: underline; }

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

code, pre {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 8px;
  z-index: 200;
  padding: 8px 16px;
  background: var(--accent-data);
  color: #04121a;
  border-radius: var(--radius-sm);
  font-weight: 600;
}
.skip-link:focus { left: 8px; }

/* ── 背景氛围 ──────────────────────────────────────────────────────────── */

.backdrop {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.backdrop__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 30%, transparent 75%);
  animation: grid-drift 24s linear infinite;
}

@keyframes grid-drift {
  from { background-position: 0 0; }
  to   { background-position: 0 56px; }
}

.backdrop__glow {
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 560px;
  background: radial-gradient(ellipse at center, rgba(34, 211, 238, 0.09), transparent 65%);
  filter: blur(30px);
}

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

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.nav__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  height: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}
.brand:hover { text-decoration: none; }

.brand__mark {
  color: var(--accent-act);
  font-family: var(--font-mono);
  font-weight: 600;
}

.nav__links {
  display: flex;
  gap: 22px;
  margin-left: auto;
}
.nav__links a {
  color: var(--text-dim);
  font-size: 0.92rem;
  transition: color 0.2s;
}
.nav__links a:hover { color: var(--text); text-decoration: none; }

.nav__cta { font-size: 0.9rem; padding: 9px 18px; }

/* ── 按钮 ──────────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s var(--ease-out), box-shadow 0.25s, background 0.25s, color 0.2s;
}
.btn:hover { text-decoration: none; }

.btn--solid {
  background: var(--accent-data);
  color: #04121a;
}
.btn--solid:hover {
  background: #4fd8f5;
  transform: translateY(-2px);
  box-shadow: 0 10px 28px -10px rgba(34, 211, 238, 0.5);
}

.btn--ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--line-strong);
}
.btn--ghost:hover {
  border-color: var(--accent-data);
  color: var(--accent-data);
  transform: translateY(-2px);
}

/* ── Section 通用 ──────────────────────────────────────────────────────── */

.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 104px 24px;
}

.section__head {
  max-width: 680px;
  margin-bottom: 56px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-act);
  margin: 0 0 14px;
}

.section__title {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4.5vw, 2.8rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0 0 16px;
}

.section__sub {
  color: var(--text-dim);
  font-size: 1.08rem;
  margin: 0;
}

/* ── 滚动揭示（JS 添加 .in-view）────────────────────────── */

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity var(--dur) var(--ease-out),
    transform var(--dur) var(--ease-out);
  will-change: opacity, transform;
}
.reveal.in-view {
  opacity: 1;
  transform: none;
}

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

.hero {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 88px 24px 40px;
  min-height: calc(100vh - var(--nav-h));
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 64px;
  align-items: center;
}

.hero__copy { position: relative; z-index: 2; }

.hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.6rem, 6.5vw, 4.4rem);
  line-height: 1.06;
  letter-spacing: -0.03em;
  margin: 0 0 22px;
}

.hero__title .line {
  display: block;
  overflow: hidden;
}
.hero__title .word {
  display: inline-block;
  transform: translateY(110%);
  opacity: 0;
  animation: word-rise 0.8s var(--ease-out) forwards;
}
.hero__title .line:nth-child(1) .word { animation-delay: 0.10s; }
.hero__title .line:nth-child(2) .word { animation-delay: 0.22s; }
.hero__title .line:nth-child(3) .word { animation-delay: 0.34s; }

.hero__title .accent {
  color: transparent;
  background: linear-gradient(100deg, var(--accent-data), #60a5fa 60%, var(--accent-data));
  -webkit-background-clip: text;
  background-clip: text;
}

@keyframes word-rise {
  to { transform: translateY(0); opacity: 1; }
}

.hero__lead {
  color: var(--text-dim);
  font-size: 1.1rem;
  max-width: 520px;
  margin: 0 0 30px;
}
.hero__lead code { color: var(--text); }

.hero__actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.hero .reveal.in-view { transition-delay: 0.1s; }
.hero .reveal:nth-of-type(2) { transition-delay: 0.15s; }
.hero .reveal:nth-of-type(3) { transition-delay: 0.25s; }

/* 活终端 */

.terminal {
  position: relative;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--bg-surface) 88%, transparent);
  box-shadow: 0 30px 80px -30px rgba(0, 0, 0, 0.7);
  overflow: hidden;
}

.terminal__bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-raised);
}

.terminal__dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}
.terminal__dot:nth-child(1) { background: #f87171; }
.terminal__dot:nth-child(2) { background: #fbbf24; }
.terminal__dot:nth-child(3) { background: #34d399; }

.terminal__title {
  margin-left: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-faint);
}

.terminal__body {
  padding: 22px 24px 26px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.85;
}

.terminal__code {
  margin: 0 0 18px;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text);
  min-height: 3.7em;
}

.terminal__code .tok-kw   { color: #c084fc; }
.terminal__code .tok-var  { color: var(--text); }
.terminal__code .tok-str  { color: var(--ok); }
.terminal__code .tok-num  { color: var(--accent-act); }
.terminal__code .tok-comment { color: var(--text-faint); font-style: italic; }

.terminal__output {
  border-top: 1px dashed var(--line);
  padding-top: 14px;
}

.terminal__row { white-space: pre-wrap; word-break: break-word; }
.terminal__row .tok-comment { color: var(--text-faint); font-style: italic; }

.tok-sql  { color: var(--accent-data); }
.tok-param { color: var(--accent-act); }

.terminal__result {
  color: var(--ok);
  font-size: 0.84rem;
}

.terminal__caret {
  position: absolute;
  right: 22px;
  bottom: 22px;
  color: var(--accent-data);
  animation: blink 1s steps(1) infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero__scroll-hint {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  margin-top: 48px;
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
}

.hero__scroll-line {
  width: 1px;
  height: 44px;
  background: linear-gradient(var(--accent-data), transparent);
  animation: scroll-pulse 2s ease-in-out infinite;
}

@keyframes scroll-pulse {
  0%, 100% { transform: scaleY(0.6); opacity: 0.6; }
  50%      { transform: scaleY(1);   opacity: 1; }
}

/* ── 事实带 ────────────────────────────────────────────────────────────── */

.facts {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg-surface) 55%, transparent);
}

.facts__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 44px 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.fact__value {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 4vw, 3rem);
  color: var(--accent-data);
  line-height: 1;
}

.fact__value--mono {
  font-family: var(--font-mono);
  font-weight: 600;
}

.fact__label {
  color: var(--text-dim);
  font-size: 0.86rem;
}

/* ── 为什么 / 特性 ──────────────────────────────────────────────────────── */

.why__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--bg-surface) 80%, transparent);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: border-color 0.3s, transform 0.3s var(--ease-out), box-shadow 0.3s;
}

.card:hover {
  border-color: var(--line-strong);
  transform: translateY(-4px);
  box-shadow: 0 24px 50px -24px rgba(0, 0, 0, 0.6);
}

.card__icon {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  font-family: var(--font-mono);
  color: var(--accent-act);
  margin-bottom: 20px;
  transition: transform 0.3s var(--ease-out), color 0.3s, border-color 0.3s;
}

.card:hover .card__icon {
  transform: rotate(-8deg) scale(1.08);
  color: var(--accent-data);
  border-color: var(--accent-data);
}

.card__title {
  font-family: var(--font-display);
  font-size: 1.22rem;
  font-weight: 600;
  margin: 0 0 10px;
}

.card__body {
  color: var(--text-dim);
  font-size: 0.95rem;
  margin: 0 0 20px;
}
.card__body code { color: var(--text); font-size: 0.86em; }

.card__code {
  margin: auto 0 0;
  max-width: 100%;
  background: rgba(0, 0, 0, 0.28);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 16px;
  font-size: 0.78rem;
  line-height: 1.7;
  overflow-x: auto;
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-word;
}

.card__code .tok-comment { color: var(--text-faint); font-style: italic; }
.card__code .tok-var     { color: #7dd3fc; }
.card__code .tok-str     { color: var(--ok); }
.card__code .tok-num     { color: var(--accent-act); }

/* ── 用法演示 ──────────────────────────────────────────────────────────── */

.demo {
  border-top: 1px solid var(--line);
}

.demo__tabs {
  display: inline-flex;
  gap: 4px;
  background: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 4px;
  margin-bottom: 18px;
}

.demo__tab {
  border: 0;
  background: transparent;
  color: var(--text-dim);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 9px 18px;
  border-radius: 4px;
  cursor: pointer;
  transition: color 0.2s, background 0.2s;
}
.demo__tab:hover { color: var(--text); }

.demo__tab.is-active {
  background: var(--bg-raised);
  color: var(--text);
  box-shadow: inset 0 0 0 1px var(--line-strong);
}

.demo__panel { display: none; }
.demo__panel.is-active { display: block; }

.demo__code {
  margin: 0;
  background: color-mix(in srgb, var(--bg-surface) 70%, transparent);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 32px;
  font-size: 0.86rem;
  line-height: 1.8;
  overflow-x: auto;
  color: var(--text);
}

.demo__code .tok-comment { color: var(--text-faint); font-style: italic; }
.demo__code .tok-var     { color: #7dd3fc; }
.demo__code .tok-kw      { color: #c084fc; }
.demo__code .tok-str     { color: var(--ok); }
.demo__code .tok-num     { color: var(--accent-act); }
.demo__code .tok-tpl     { color: var(--accent-data); }

/* ── 诚实边界 / 对比 ───────────────────────────────────────────────────── */

.honest {
  border-top: 1px solid var(--line);
}

.honest__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.honest__item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--bg-surface) 55%, transparent);
  padding: 26px 28px;
}

.honest__item h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.honest__item h3::before {
  content: "·";
  color: var(--accent-act);
  font-family: var(--font-mono);
}

.honest__item p {
  color: var(--text-dim);
  font-size: 0.94rem;
  margin: 0;
}
.honest__item code { color: var(--text); font-size: 0.86em; }

/* ── 特性表 ────────────────────────────────────────────────────────────── */

.table-wrap {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  overflow-x: auto;
  background: color-mix(in srgb, var(--bg-surface) 55%, transparent);
}

.table-wrap table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  min-width: 560px;
}

.table-wrap th, .table-wrap td {
  text-align: left;
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.table-wrap tr:last-child th,
.table-wrap tr:last-child td { border-bottom: 0; }

.table-wrap th {
  color: var(--accent-act);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: color-mix(in srgb, var(--bg-raised) 60%, transparent);
  white-space: nowrap;
}

.table-wrap td { color: var(--text-dim); }
.table-wrap td code { color: var(--text); font-size: 0.84em; }
.table-wrap td:first-child code { color: var(--accent-data); }

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

.cta { padding-top: 40px; }

.cta__box {
  border: 1px solid var(--line-strong);
  border-radius: 16px;
  background:
    radial-gradient(ellipse 60% 100% at 50% 0%, rgba(34, 211, 238, 0.08), transparent 70%),
    var(--bg-surface);
  padding: 72px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta__title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 28px;
}

.cta__cmd {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  padding: 16px 28px;
  font-size: 0.95rem;
  color: var(--text);
  margin: 0 0 18px;
  position: relative;
}

.cta__cmd code { color: var(--ok); }

.cta__cursor {
  width: 8px;
  height: 18px;
  background: var(--accent-data);
  animation: blink 1.1s steps(1) infinite;
}

.cta__note {
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  margin: 0 0 30px;
}

.cta__actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

/* ── Footer ────────────────────────────────────────────────────────────── */

.footer {
  border-top: 1px solid var(--line);
  padding: 40px 24px;
}

.footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 32px;
  align-items: baseline;
  color: var(--text-dim);
  font-size: 0.88rem;
}

.footer__inner .brand { color: var(--text); }

.footer__meta {
  color: var(--text-faint);
  font-size: 0.8rem;
  margin-left: auto;
}

/* ── 响应式 ────────────────────────────────────────────────────────────── */

@media (max-width: 960px) {
  .hero__inner { grid-template-columns: 1fr; gap: 48px; }
  .hero { padding-top: 56px; }
  .why__grid { grid-template-columns: 1fr; }
  .facts__inner { grid-template-columns: repeat(2, 1fr); row-gap: 32px; }
}

@media (max-width: 640px) {
  .section { padding: 72px 20px; }
  .hero { padding: 44px 20px; }

  .nav__links { display: none; }

  .facts__inner { grid-template-columns: repeat(2, 1fr); }
  .honest__grid { grid-template-columns: 1fr; }
  .cta__box { padding: 52px 22px; }
  .cta__cmd { font-size: 0.8rem; padding: 14px 18px; }

  .hero__actions { flex-direction: column; align-items: stretch; }
  .hero__actions .btn { width: 100%; }
}

/* ── 减少动效偏好 ──────────────────────────────────────────────────────── */

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

  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .hero__title .word {
    transform: none;
    opacity: 1;
  }

  .reveal { opacity: 1; transform: none; }

  .backdrop__grid { animation: none; }
}