/* ==========================================================================
   LMNTIC blog — base stylesheet
   Brand: indigo #131B4B · blue #0F84E2 · light-blue #24D3FF
          violet #6922D3 · light-violet #AB56FC · Pretendard
   All asset paths are root-absolute under / (served at blog.lmntic.com).
   ========================================================================== */

/* ---- Self-hosted Pretendard (dynamic subset) -----------------------------
   The browser fetches only the unicode-ranges each page actually uses
   (basic Latin ~34KB); the full 92-file set lives in /assets/fonts/.
   font-display: swap is set inside the imported CSS. ------------------------- */
@import url("/assets/fonts/pretendardvariable-dynamic-subset.css");

/* ---- Design tokens -------------------------------------------------------- */
:root {
  --indigo: #131b4b;
  --blue: #0f84e2;
  --light-blue: #24d3ff;
  --violet: #6922d3;
  --light-violet: #ab56fc;

  --ink: #0b1020;
  --slate: #5b6478;
  --line: #e6e9f0;
  --bg: #ffffff;
  --bg-soft: #f6f8fc;
  --surface: #ffffff;

  --accent: var(--blue);
  --accent-2: var(--light-blue);
  --gradient: linear-gradient(90deg, var(--blue), var(--light-blue));

  --font: "Pretendard Variable", "Pretendard", -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, "Helvetica Neue", Arial, "Apple SD Gothic Neo",
    "Malgun Gothic", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;

  --measure: 68ch;
  --wrap: 1120px;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(19, 27, 75, 0.04), 0 8px 24px rgba(19, 27, 75, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #eef1f8;
    --slate: #9aa4bd;
    --line: #26304f;
    --bg: #0a0f22;
    --bg-soft: #0f1631;
    --surface: #111938;

    --accent: #47a3f0;
    --accent-2: var(--light-blue);
    --gradient: linear-gradient(90deg, #47a3f0, var(--light-blue));
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 28px rgba(0, 0, 0, 0.35);
  }
}

/* ---- Reset / base --------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 18px;
  line-height: 1.7;
  font-feature-settings: "ss01", "cv01";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}
a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---- Layout --------------------------------------------------------------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 40px);
}

/* ---- Header --------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(150%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 66px;
}
.wordmark {
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.14em;
  color: var(--indigo);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
@media (prefers-color-scheme: dark) {
  .wordmark {
    color: #fff;
  }
}
.wordmark:hover {
  text-decoration: none;
}
.wordmark .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gradient);
}
.nav {
  display: flex;
  gap: 26px;
  align-items: center;
  font-size: 15px;
  font-weight: 600;
}
.nav a {
  color: var(--slate);
}
.nav a:hover {
  color: var(--accent);
  text-decoration: none;
}

/* ---- Hero (landing) ------------------------------------------------------- */
.hero {
  padding: clamp(48px, 8vw, 96px) 0 clamp(28px, 4vw, 48px);
  border-bottom: 1px solid var(--line);
}
.hero .eyebrow {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 14px;
}
.hero h1 {
  font-size: clamp(34px, 6vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  max-width: 18ch;
}
.hero p {
  font-size: clamp(17px, 2.2vw, 21px);
  color: var(--slate);
  margin: 0;
  max-width: 60ch;
}
.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---- Post list (landing) -------------------------------------------------- */
.post-list {
  list-style: none;
  margin: 0;
  padding: clamp(28px, 5vw, 56px) 0;
  display: grid;
  gap: 8px;
}
.post-item {
  padding: 26px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}
.post-item:hover {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}
.post-item h2 {
  font-size: 23px;
  line-height: 1.25;
  margin: 8px 0 8px;
  letter-spacing: -0.01em;
}
.post-item h2 a {
  color: var(--ink);
}
.post-item h2 a:hover {
  color: var(--accent);
  text-decoration: none;
}
.post-item p {
  margin: 0;
  color: var(--slate);
  font-size: 16px;
}
.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  font-size: 13px;
  color: var(--slate);
}
.post-meta time {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}
.tag {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--violet);
  background: color-mix(in srgb, var(--violet) 10%, transparent);
  border-radius: 999px;
  padding: 3px 10px;
}
.empty-state {
  color: var(--slate);
  padding: 32px 0;
}

/* ---- Article (post) ------------------------------------------------------- */
.post {
  padding: clamp(36px, 6vw, 72px) 0 24px;
}
.post-header {
  max-width: var(--measure);
  margin-inline: auto;
  margin-bottom: 36px;
}
.post-header h1 {
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 12px 0 16px;
}
.post-header .post-meta {
  font-size: 14px;
}
.prose {
  max-width: var(--measure);
  margin-inline: auto;
}
.prose > * + * {
  margin-top: 1.25em;
}
.prose h2 {
  font-size: 27px;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-top: 2em;
  padding-top: 0.4em;
}
.prose h3 {
  font-size: 21px;
  margin-top: 1.6em;
}
.prose p,
.prose li {
  color: var(--ink);
}
.prose a {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent);
}
.prose ul,
.prose ol {
  padding-left: 1.3em;
}
.prose li + li {
  margin-top: 0.4em;
}
.prose blockquote {
  margin: 1.6em 0;
  padding: 4px 0 4px 22px;
  border-left: 3px solid var(--accent);
  color: var(--slate);
  font-style: italic;
}
.prose code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.1em 0.4em;
}
.prose pre {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  overflow-x: auto;
  font-size: 15px;
  line-height: 1.6;
}
.prose pre code {
  background: none;
  border: 0;
  padding: 0;
}
.prose figure {
  margin: 2em 0;
}
.prose figure img {
  border-radius: var(--radius);
  border: 1px solid var(--line);
}
.prose figcaption {
  margin-top: 10px;
  font-size: 14px;
  color: var(--slate);
  text-align: center;
}
.prose hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 2.4em 0;
}
.lede {
  font-size: clamp(19px, 2.4vw, 22px);
  color: var(--slate);
  line-height: 1.6;
}

/* ---- Back link ------------------------------------------------------------ */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--slate);
  margin-bottom: 8px;
}
.back-link:hover {
  color: var(--accent);
  text-decoration: none;
}

/* ---- Disclaimer + footer -------------------------------------------------- */
.disclaimer {
  max-width: var(--measure);
  margin: 40px auto 0;
  padding: 18px 20px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--slate);
}
.disclaimer strong {
  color: var(--ink);
}
.site-footer {
  margin-top: clamp(56px, 9vw, 104px);
  background: var(--indigo);
  color: #c7cede;
}
@media (prefers-color-scheme: dark) {
  .site-footer {
    background: #060a18;
    border-top: 1px solid var(--line);
  }
}
.site-footer .wrap {
  padding-block: 48px;
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: space-between;
  align-items: center;
}
.site-footer a {
  color: #fff;
  font-weight: 600;
}
.site-footer .muted {
  font-size: 13.5px;
  color: #8b93ac;
  max-width: 46ch;
}

/* ---- Utilities ------------------------------------------------------------ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

@media (max-width: 640px) {
  body {
    font-size: 17px;
  }
  .nav {
    gap: 18px;
  }
}