/* Hallmark · macrostructure: Index-First · genre: modern-minimal · theme: Cobalt (dual-mode) ·
 * tone: technical-calm · enrichment: none · nav: N9 edge-aligned · footer: Ft2 inline line
 * pre-emit critique: P5 H5 E5 S5 R5 V5
 */

/* ---- 字体资源（自托管 woff2） ---- */
@font-face {
  font-family: "Space Grotesk";
  src: url("/static/fonts/space-grotesk-latin-400-normal.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Space Grotesk";
  src: url("/static/fonts/space-grotesk-latin-500-normal.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Space Grotesk";
  src: url("/static/fonts/space-grotesk-latin-600-normal.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Space Grotesk";
  src: url("/static/fonts/space-grotesk-latin-700-normal.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Inter";
  src: url("/static/fonts/inter-latin-400-normal.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Inter";
  src: url("/static/fonts/inter-latin-500-normal.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Inter";
  src: url("/static/fonts/inter-latin-600-normal.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("/static/fonts/jetbrains-mono-latin-400-normal.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("/static/fonts/jetbrains-mono-latin-500-normal.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

/* ---- Tokens ---- */
:root {
  /* 字体 */
  --font-display: "Space Grotesk", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  /* 字号 · 1.25 major third */
  --text-xs: 0.6875rem;   /* 11px */
  --text-sm: 0.8125rem;   /* 13px */
  --text-base: 1rem;      /* 16px */
  --text-md: 1.25rem;     /* 20px */
  --text-lg: 1.5625rem;   /* 25px */
  --text-xl: 1.9531rem;   /* 31px */
  --text-2xl: 2.4414rem;  /* 39px */
  --text-display: clamp(2.25rem, 5vw + 0.9rem, 3.5rem);

  /* 间距 · 4pt 语义刻度 */
  --space-2xs: 0.25rem;   /*  4px */
  --space-xs: 0.5rem;     /*  8px */
  --space-sm: 0.75rem;    /* 12px */
  --space-md: 1rem;       /* 16px */
  --space-lg: 1.5rem;     /* 24px */
  --space-xl: 2.5rem;     /* 40px */
  --space-2xl: 4rem;      /* 64px */
  --space-3xl: 6rem;      /* 96px */

  /* 动效 */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 160ms;
  --dur-base: 320ms;
  --dur-slow: 600ms;

  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 6px;    /* Cobalt: 尺规绘制的 6px 控件 */
  --radius-lg: 10px;   /* 代码卡 / 大面 */

  /* z-index */
  --z-base: 1;
  --z-raised: 10;
  --z-sticky: 200;
}

/* ---- 主题 · Cobalt 双模式（hue 恒为 ~255，仅亮度与色度变化） ---- */
:root[data-theme="light"] {
  --color-paper:    oklch(98.5% 0.004 250);
  --color-paper-2:  oklch(96.5% 0.006 250);
  --color-rule:     oklch(90%  0.008 252);
  --color-rule-2:   oklch(83%  0.01  252);
  --color-graphite: oklch(22%  0.016 260);
  --color-ink:      oklch(24%  0.02  258);
  --color-ink-2:    oklch(34%  0.018 257);
  --color-muted:    oklch(52%  0.015 256);
  --color-accent:   oklch(58%  0.20  256);
  --color-accent-ink: oklch(99%  0.005 250);
  --color-focus:    oklch(58%  0.20  256);
  --shadow-card:    0 1px 2px oklch(24% 0.02 258 / 0.05);
}

:root[data-theme="dark"] {
  --color-paper:    oklch(15%  0.012 258);
  --color-paper-2:  oklch(18.5% 0.013 258);
  --color-rule:     oklch(28%  0.015 258);
  --color-rule-2:   oklch(37%  0.016 258);
  --color-graphite: oklch(10%  0.01  258);
  --color-ink:      oklch(94%  0.006 250);
  --color-ink-2:    oklch(87%  0.008 251);
  --color-muted:    oklch(68%  0.012 254);
  --color-accent:   oklch(68%  0.17  256);
  --color-accent-ink: oklch(15%  0.012 258);
  --color-focus:    oklch(68%  0.17  256);
  --shadow-card:    0 1px 2px oklch(10% 0.01 258 / 0.4);
}

/* ---- 基础 ---- */
html {
  overflow-x: clip;
  scroll-behavior: smooth;
}
body {
  overflow-x: clip;
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink-2);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color var(--dur-base) var(--ease-out),
              color var(--dur-base) var(--ease-out);
}

a { color: inherit; }

/* 主题切换的平滑过渡 */
body, .nav, .card, .intro__name, .theme-toggle svg {
  transition-property: background-color, border-color, color, fill, stroke;
  transition-duration: var(--dur-base);
  transition-timing-function: var(--ease-out);
}

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

.wrap {
  width: 100%;
  max-width: 44rem;
  margin-inline: auto;
  padding-inline: var(--space-lg);
  box-sizing: border-box;
}

::selection {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

/* ---- 导航 · N9 edge-aligned minimal ---- */
.nav {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: color-mix(in oklch, var(--color-paper) 82%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-rule);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-md);
}
.wordmark {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-md);
  letter-spacing: -0.02em;
  color: var(--color-ink);
  text-decoration: none;
}
.wordmark__icon {
  /* 像素风图标放大：禁用插值平滑，保持像素锐利 */
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  width: 24px;
  height: 24px;
  flex: none;
}
.wordmark__dot { color: var(--color-accent); }
.nav__right {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}
.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-ink-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-block: 2px;
  transition: border-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out);
}
.nav__link:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--color-ink);
  cursor: pointer;
  transition: border-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              background-color var(--dur-fast) var(--ease-out);
}
.theme-toggle:hover {
  border-color: var(--color-rule-2);
  color: var(--color-accent);
}
.theme-toggle svg { display: none; }
:root[data-theme="light"] .icon-sun { display: block; }
:root[data-theme="dark"]  .icon-moon { display: block; }

/* ---- 导言区 ---- */
.intro {
  padding-block: clamp(4rem, 12vh, 8rem) var(--space-2xl);
}
.intro__icon {
  /* 4 倍整数放大像素徽章：pixelated 下整数倍最锐利 */
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  width: 64px;
  height: 64px;
  margin-bottom: var(--space-lg);
  border-radius: var(--radius-md);
}
.intro__eyebrow {
  margin: 0 0 var(--space-md);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
}
.intro__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-display);
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--color-ink);
  overflow-wrap: anywhere;
  min-width: 0;
}
.intro__tagline {
  margin: var(--space-lg) 0 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--text-lg);
  letter-spacing: -0.01em;
  line-height: 1.3;
  color: var(--color-ink);
}
.intro__lede {
  margin: var(--space-md) 0 0;
  max-width: 38rem;
  color: var(--color-ink-2);
}
.intro__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md) var(--space-xl);
  margin: var(--space-xl) 0 0;
  padding: 0;
  list-style: none;
}
.meta-item {
  display: flex;
  align-items: baseline;
  gap: var(--space-xs);
}
.meta-item__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-muted);
}
.meta-item__value {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--color-rule-2);
  transition: color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
}
.meta-item__value:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* ---- 作品区 ---- */
.projects {
  padding-block: var(--space-2xl) var(--space-3xl);
  border-top: 1px solid var(--color-rule);
}
.projects__head {
  margin-bottom: var(--space-xl);
}
.projects__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-xl);
  letter-spacing: -0.02em;
  color: var(--color-ink);
}
.projects__note {
  margin: var(--space-xs) 0 0;
  font-size: var(--text-sm);
  color: var(--color-muted);
  max-width: 36rem;
}

/* 平铺卡片 —— 垂直堆叠，非网格 */
.cards {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding: var(--space-lg);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-lg);
  background: var(--color-paper-2);
  text-decoration: none;
  box-shadow: var(--shadow-card);
  transition: border-color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
}
.card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}
.card:active {
  transform: translateY(0);
}
.card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}
.card__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-md);
  letter-spacing: -0.01em;
  color: var(--color-ink);
}
.card__arrow {
  flex: none;
  color: var(--color-muted);
  transition: color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
}
.card:hover .card__arrow {
  color: var(--color-accent);
  transform: translate(2px, -2px);
}
.card__desc {
  font-size: var(--text-sm);
  color: var(--color-ink-2);
}
.card__host {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.02em;
  color: var(--color-muted);
}

/* ---- 页脚 · Ft2 inline single line ---- */
.foot {
  padding-block: var(--space-xl) var(--space-2xl);
  border-top: 1px solid var(--color-rule);
}
.foot__line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-xs);
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-muted);
}
.foot__copy { color: var(--color-ink-2); }
.foot__sep { color: var(--color-rule-2); }

/* ---- 进入动效（reduced-motion 下为静态） ---- */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}
.reveal.is-in {
  opacity: 1;
  transform: none;
}

/* ---- 响应式 ---- */
@media (max-width: 480px) {
  .wrap { padding-inline: var(--space-md); }
  .intro { padding-block: var(--space-2xl) var(--space-xl); }
  .card { padding: var(--space-md); }
  .intro__meta { gap: var(--space-sm) var(--space-lg); }
  .foot { padding-block: var(--space-lg) var(--space-xl); }
}

/* ---- 无障碍：减少动效 ---- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  body, .nav, .card, .intro__name, .theme-toggle svg {
    transition-duration: 0.01ms !important;
    transition-property: none !important;
  }
  .card { transform: none !important; }
  .card__arrow { transition: none !important; }
  .reveal { opacity: 1; transform: none; transition: none; }
}