/*
  devwei.com - Independent developer tech writing site
  Style direction: Swiss Modernism 2.0 + light motion
  Typography: IBM Plex Sans + JetBrains Mono (CJK falls back to system fonts)
*/

/* IBM Plex Sans (variable, latin + latin-ext) */
@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 100 700;
  font-display: swap;
  src: url("/assets/fonts/ibm-plex-sans-latin-ext-wght-normal.woff2")
    format("woff2-variations");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7,
    U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F,
    U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F,
    U+A720-A7FF;
}

@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 100 700;
  font-display: swap;
  src: url("/assets/fonts/ibm-plex-sans-latin-wght-normal.woff2")
    format("woff2-variations");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6,
    U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122,
    U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "IBM Plex Sans";
  font-style: italic;
  font-weight: 100 700;
  font-display: swap;
  src: url("/assets/fonts/ibm-plex-sans-latin-ext-wght-italic.woff2")
    format("woff2-variations");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7,
    U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F,
    U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F,
    U+A720-A7FF;
}

@font-face {
  font-family: "IBM Plex Sans";
  font-style: italic;
  font-weight: 100 700;
  font-display: swap;
  src: url("/assets/fonts/ibm-plex-sans-latin-wght-italic.woff2")
    format("woff2-variations");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6,
    U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122,
    U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* JetBrains Mono (variable, latin + latin-ext) */
@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 100 800;
  font-display: swap;
  src: url("/assets/fonts/jetbrains-mono-latin-ext-wght-normal.woff2")
    format("woff2-variations");
  unicode-range: U+0100-02AF, U+0300-0301, U+0303-0304, U+0308-0309,
    U+0323, U+0329, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113,
    U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 100 800;
  font-display: swap;
  src: url("/assets/fonts/jetbrains-mono-latin-wght-normal.woff2")
    format("woff2-variations");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6,
    U+02DA, U+02DC, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329,
    U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215,
    U+FEFF, U+FFFD;
}

@font-face {
  font-family: "JetBrains Mono";
  font-style: italic;
  font-weight: 100 800;
  font-display: swap;
  src: url("/assets/fonts/jetbrains-mono-latin-ext-wght-italic.woff2")
    format("woff2-variations");
  unicode-range: U+0100-02AF, U+0300-0301, U+0303-0304, U+0308-0309,
    U+0323, U+0329, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113,
    U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: "JetBrains Mono";
  font-style: italic;
  font-weight: 100 800;
  font-display: swap;
  src: url("/assets/fonts/jetbrains-mono-latin-wght-italic.woff2")
    format("woff2-variations");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6,
    U+02DA, U+02DC, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329,
    U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215,
    U+FEFF, U+FFFD;
}

:root {
  color-scheme: light dark;

  /* Swiss modernism: neutral base + single signal accent */
  --bg: #fcfaf5;
  --bg-2: #f4f2ed;
  --text: #0b0b0f;
  --muted: #4b5563;
  --muted-2: #6b7280;
  --border: rgba(11, 11, 15, 0.14);
  --shadow: rgba(11, 11, 15, 0.08);

  --accent: #f97316;
  --accent-ink: #7c2d12;

  --focus: rgba(249, 115, 22, 0.45);

  --radius-sm: 10px;
  --radius-md: 16px;

  --container: 1120px;
  --reading: 760px;

  --step--1: clamp(0.88rem, 0.82rem + 0.2vw, 0.95rem);
  --step-0: clamp(1rem, 0.92rem + 0.35vw, 1.1rem);
  --step-1: clamp(1.2rem, 1.05rem + 0.7vw, 1.4rem);
  --step-2: clamp(1.5rem, 1.18rem + 1.3vw, 1.95rem);
  --step-3: clamp(2.1rem, 1.55rem + 2.2vw, 2.8rem);

  --space-1: 6px;
  --space-2: 10px;
  --space-3: 14px;
  --space-4: 18px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 44px;
  --space-8: 60px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0b0f;
    --bg-2: #111118;
    --text: #f5f5f4;
    --muted: rgba(245, 245, 244, 0.78);
    --muted-2: rgba(245, 245, 244, 0.62);
    --border: rgba(245, 245, 244, 0.14);
    --shadow: rgba(0, 0, 0, 0.35);

    --accent: #fb923c;
    --accent-ink: #fed7aa;

    --focus: rgba(251, 146, 60, 0.38);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family:
    "IBM Plex Sans",
    "PingFang SC",
    "Hiragino Sans GB",
    "Microsoft YaHei",
    "Noto Sans CJK SC",
    sans-serif;
  font-size: var(--step-0);
  line-height: 1.65;
  color: var(--text);
  background: radial-gradient(
      1000px 540px at 20% 10%,
      rgba(249, 115, 22, 0.09),
      transparent 55%
    ),
    radial-gradient(
      900px 500px at 85% 15%,
      rgba(11, 11, 15, 0.06),
      transparent 60%
    ),
    linear-gradient(180deg, var(--bg), var(--bg-2));
}

::selection {
  background: rgba(249, 115, 22, 0.25);
}

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

a:hover {
  color: var(--accent);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid transparent;
  box-shadow: 0 0 0 3px var(--focus);
  border-radius: 8px;
}

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

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

@media (max-width: 640px) {
  .container {
    padding: 0 var(--space-4);
  }
}

.skip-link {
  position: absolute;
  left: -999px;
  top: var(--space-4);
  z-index: 1000;
  padding: 10px 12px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 12px 30px var(--shadow);
}

.skip-link:focus {
  left: var(--space-4);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  padding: var(--space-4) 0;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg), transparent 35%);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand__mark {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background-image:
    url("/assets/icons/avatar.jpg"),
    linear-gradient(135deg, var(--text), var(--accent));
  background-size: cover, cover;
  background-position: center, center;
  background-repeat: no-repeat, no-repeat;
  box-shadow:
    0 14px 34px var(--shadow),
    inset 0 0 0 1px rgba(255, 255, 255, 0.12);
}

.brand__text {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.brand__name {
  font-weight: 650;
  letter-spacing: -0.02em;
  font-size: 1rem;
}

.brand__tagline {
  font-size: var(--step--1);
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav__link {
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid transparent;
  color: var(--muted);
  transition:
    color 160ms ease,
    border-color 160ms ease,
    background-color 160ms ease;
  cursor: pointer;
}

.nav__link:hover {
  color: var(--text);
  border-color: var(--border);
  background: color-mix(in srgb, var(--bg), transparent 20%);
}

.nav__link[aria-current="page"] {
  color: var(--text);
  border-color: var(--border);
  background: color-mix(in srgb, var(--bg), transparent 12%);
}

.hero {
  padding: var(--space-8) 0 var(--space-7);
}

.hero__grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-7);
  align-items: start;
}

@media (max-width: 960px) {
  .hero__grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
}

.hero__title {
  font-size: var(--step-3);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 0;
}

.hero__subtitle {
  margin: var(--space-5) 0 0;
  color: var(--muted);
  max-width: 60ch;
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: var(--space-6);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  background: color-mix(in srgb, var(--bg), transparent 10%);
}

.chip strong {
  color: var(--text);
  font-weight: 650;
}

.panel {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--bg), transparent 7%);
  box-shadow: 0 18px 50px var(--shadow);
  overflow: hidden;
}

.panel__hd {
  padding: var(--space-5);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-4);
}

.panel__title {
  margin: 0;
  font-size: var(--step-1);
  letter-spacing: -0.02em;
}

.panel__hint {
  color: var(--muted);
  font-size: var(--step--1);
}

.panel__bd {
  padding: var(--space-5);
}

.post-list {
  display: grid;
  gap: var(--space-4);
}

.post-card {
  display: grid;
  gap: 10px;
  padding: var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg), transparent 3%);
  transition:
    border-color 160ms ease,
    transform 160ms ease,
    box-shadow 160ms ease;
  cursor: pointer;
}

.post-card:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--accent), var(--border) 70%);
  box-shadow: 0 22px 60px var(--shadow);
}

.post-card__kicker {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: var(--step--1);
}

.post-card__title {
  margin: 0;
  font-size: var(--step-1);
  letter-spacing: -0.02em;
}

.post-card__desc {
  margin: 0;
  color: var(--muted);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px dashed var(--border);
  color: var(--muted);
  font-size: var(--step--1);
}

.tag:hover {
  border-style: solid;
  border-color: color-mix(in srgb, var(--accent), var(--border) 70%);
  color: var(--text);
}

.icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  margin-left: 6px;
  border-radius: 999px;
  border: 1px dashed var(--border);
  color: var(--muted);
  vertical-align: middle;
}

.icon-link:hover {
  border-style: solid;
  border-color: color-mix(in srgb, var(--accent), var(--border) 70%);
  color: var(--text);
}

.icon {
  width: 18px;
  height: 18px;
  display: block;
}

.prose a.icon-link {
  text-decoration: none;
}

.page {
  padding: var(--space-7) 0 var(--space-8);
}

.page__title {
  margin: 0 0 var(--space-5);
  font-size: var(--step-2);
  letter-spacing: -0.02em;
}

.page__lede {
  margin: 0 0 var(--space-6);
  color: var(--muted);
  max-width: 72ch;
}

.reading {
  max-width: var(--reading);
}

.prose {
  font-size: 1.02rem;
  line-height: 1.8;
}

.prose h2,
.prose h3 {
  scroll-margin-top: 120px;
}

.prose h2 {
  font-size: 1.4rem;
  letter-spacing: -0.02em;
  margin: 2.2em 0 0.8em;
}

.prose h3 {
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  margin: 1.8em 0 0.6em;
}

.prose p {
  margin: 1em 0;
}

.prose ul,
.prose ol {
  margin: 1em 0;
  padding-left: 1.25em;
}

.prose li {
  margin: 0.35em 0;
}

.prose a {
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent), transparent 55%);
  text-underline-offset: 4px;
}

.prose a:hover {
  text-decoration-color: var(--accent);
}

.prose code {
  font-family:
    "JetBrains Mono",
    ui-monospace,
    SFMono-Regular,
    Menlo,
    Monaco,
    Consolas,
    "Liberation Mono",
    "Courier New",
    monospace;
  font-size: 0.95em;
  background: color-mix(in srgb, var(--bg-2), transparent 5%);
  border: 1px solid var(--border);
  padding: 2px 6px;
  border-radius: 8px;
}

.prose pre {
  overflow: auto;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--text), var(--bg) 92%);
  box-shadow: 0 20px 55px var(--shadow);
}

@media (prefers-color-scheme: dark) {
  .prose pre {
    background: color-mix(in srgb, #000, var(--bg) 55%);
  }
}

.prose pre code {
  background: transparent;
  border: 0;
  padding: 0;
  color: color-mix(in srgb, var(--text), #fff 8%);
}

.prose blockquote {
  margin: 1.4em 0;
  padding: 12px 14px;
  border-left: 3px solid var(--accent);
  background: color-mix(in srgb, var(--bg), transparent 8%);
  color: var(--muted);
  border-radius: 12px;
}

.hr {
  height: 1px;
  background: var(--border);
  margin: var(--space-7) 0;
  border: 0;
}

.site-footer {
  padding: var(--space-7) 0;
  border-top: 1px solid var(--border);
  color: var(--muted);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-6);
  align-items: start;
}

@media (max-width: 840px) {
  .footer__grid {
    grid-template-columns: 1fr;
  }
}

.footer__small {
  font-size: var(--step--1);
  color: var(--muted-2);
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

@media (max-width: 840px) {
  .footer__links {
    justify-content: flex-start;
  }
}

.footer__links a {
  color: var(--muted);
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid transparent;
}

.footer__links a:hover {
  border-color: var(--border);
  color: var(--text);
}

/* Motion-driven (light) */
.reveal {
  opacity: 0;
  transform: translateY(8px);
  transition:
    opacity 520ms cubic-bezier(0.2, 0.9, 0.2, 1),
    transform 520ms cubic-bezier(0.2, 0.9, 0.2, 1);
  will-change: opacity, transform;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    transition: none;
    transform: none;
    opacity: 1;
  }

  .post-card {
    transition: border-color 160ms ease, box-shadow 160ms ease;
  }

  .post-card:hover {
    transform: none;
  }
}