/* Frost Workspace — Solana Learning Library
   Theme: dark navy/graphite, white text, purple/cyan/teal accents */

:root {
  --bg-0: #070b16;
  --bg-1: #0b1020;
  --bg-2: #11182e;
  --bg-3: #18203a;
  --line: #233055;
  --line-soft: #1a2440;
  --text: #eef2ff;
  --text-dim: #aeb9d6;
  --text-mute: #7c89ad;
  --purple: #7c5cff;
  --purple-2: #9a7cff;
  --cyan: #22d3ee;
  --teal: #2dd4bf;
  --accent-grad: linear-gradient(135deg, #7c5cff 0%, #22d3ee 55%, #2dd4bf 100%);
  --shadow: 0 18px 50px rgba(8, 12, 26, 0.55);
  --radius: 16px;
  --radius-sm: 10px;
  --maxw: 1180px;
  --font: "Pretendard", "Noto Sans KR", "Apple SD Gothic Neo", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background:
    radial-gradient(1100px 700px at 12% -8%, rgba(124, 92, 255, 0.18), transparent 60%),
    radial-gradient(900px 600px at 100% 0%, rgba(34, 211, 238, 0.12), transparent 55%),
    radial-gradient(800px 600px at 80% 100%, rgba(45, 212, 191, 0.10), transparent 55%),
    var(--bg-0);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  min-height: 100%;
}

a { color: var(--cyan); text-decoration: none; }
a:hover { color: var(--purple-2); }

h1, h2, h3, h4 { color: #fff; line-height: 1.25; margin: 0 0 0.6em; font-weight: 700; letter-spacing: -0.01em; }
h1 { font-size: clamp(2.1rem, 4.6vw, 3.4rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
h3 { font-size: 1.25rem; }
p { margin: 0 0 1rem; color: var(--text-dim); }
strong { color: #fff; }
code, pre { font-family: var(--mono); }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }
.section { padding: 64px 0; }
.section.tight { padding: 38px 0; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.78rem; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--cyan); font-weight: 600;
  padding: 6px 12px; border: 1px solid var(--line); border-radius: 999px;
  background: rgba(34, 211, 238, 0.06);
}
.eyebrow::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--cyan); box-shadow: 0 0 12px var(--cyan);
}
.lead { font-size: 1.12rem; color: var(--text-dim); max-width: 62ch; }
.grad-text {
  background: var(--accent-grad); -webkit-background-clip: text; background-clip: text;
  color: transparent;
}

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(7, 11, 22, 0.72);
  border-bottom: 1px solid var(--line-soft);
}
.site-header .bar { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; color: #fff; }
.brand .mark {
  width: 30px; height: 30px; border-radius: 8px;
  background: var(--accent-grad);
  display: grid; place-items: center; color: #070b16; font-weight: 800;
  box-shadow: 0 6px 18px rgba(124, 92, 255, 0.35);
}
.brand small { color: var(--text-mute); font-weight: 500; letter-spacing: 0.04em; }

.nav { display: flex; align-items: center; gap: 4px; }
.nav a {
  color: var(--text-dim); font-size: 0.95rem; padding: 8px 12px; border-radius: 8px;
  transition: color .15s, background .15s;
}
.nav a:hover { color: #fff; background: rgba(124, 92, 255, 0.10); }
.nav a.active { color: #fff; background: rgba(34, 211, 238, 0.10); }

.nav-cta { display: inline-flex; align-items: center; gap: 8px; }
.menu-toggle {
  display: none; background: transparent; border: 1px solid var(--line);
  color: var(--text); width: 42px; height: 42px; border-radius: 10px; cursor: pointer;
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 20px; border-radius: 12px; font-weight: 600; cursor: pointer;
  border: 1px solid transparent; font-size: 0.98rem; transition: transform .12s, box-shadow .2s, background .2s;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--accent-grad); color: #070b16; box-shadow: 0 10px 28px rgba(124, 92, 255, 0.30); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--cyan); color: #fff; }
.btn-soft { background: rgba(124, 92, 255, 0.12); color: var(--purple-2); border-color: rgba(124, 92, 255, 0.25); }

/* Cards */
.card {
  background: linear-gradient(180deg, rgba(24, 32, 58, 0.6), rgba(11, 16, 32, 0.6));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  transition: border-color .2s, transform .2s, box-shadow .2s;
}
.card:hover { border-color: rgba(34, 211, 238, 0.45); transform: translateY(-3px); box-shadow: var(--shadow); }
.card h3 { margin-top: 0; }
.card .tag { color: var(--cyan); font-size: 0.78rem; letter-spacing: 0.12em; text-transform: uppercase; font-weight: 600; }

.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 980px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 680px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .nav { display: none; }
  .menu-toggle { display: inline-grid; place-items: center; }
  .nav.open {
    display: flex; flex-direction: column; align-items: stretch;
    position: absolute; top: 66px; left: 0; right: 0;
    background: rgba(7, 11, 22, 0.98); border-bottom: 1px solid var(--line);
    padding: 12px 16px 18px; gap: 4px;
  }
  .nav.open a { padding: 12px 14px; }
}

/* Hero */
.hero { padding: 70px 0 40px; position: relative; overflow: hidden; }
.hero .grid-hero { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 40px; align-items: center; }
.hero h1 { margin-top: 18px; }
.hero .cta-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 26px; }
.hero .meta { display: flex; gap: 26px; flex-wrap: wrap; margin-top: 28px; color: var(--text-mute); font-size: 0.9rem; }
.hero .meta b { color: #fff; font-size: 1.1rem; display: block; }
.hero-art {
  border: 1px solid var(--line); border-radius: 18px; padding: 22px;
  background: linear-gradient(180deg, rgba(24,32,58,0.7), rgba(11,16,32,0.7));
  box-shadow: var(--shadow);
}
@media (max-width: 880px) { .hero .grid-hero { grid-template-columns: 1fr; } }

/* Code block */
.code {
  font-family: var(--mono); font-size: 0.86rem; color: #cfe9ff;
  background: #06090f; border: 1px solid var(--line); border-radius: 12px;
  padding: 16px 18px; overflow-x: auto; white-space: pre;
}
.code .c { color: #6b7896; }
.code .k { color: #c4b5ff; }
.code .s { color: #7ee0c0; }
.code .n { color: #ffd479; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--line-soft);
  background: rgba(7, 11, 22, 0.85);
  padding: 50px 0 26px;
  margin-top: 60px;
}
.site-footer .cols { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 28px; }
@media (max-width: 880px) { .site-footer .cols { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .site-footer .cols { grid-template-columns: 1fr; } }
.site-footer h4 { color: #fff; font-size: 0.95rem; margin-bottom: 12px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 8px; }
.site-footer a { color: var(--text-dim); }
.site-footer a:hover { color: var(--cyan); }
.footer-contact { color: var(--text-dim); font-size: 0.92rem; }
.footer-contact .row { display: flex; gap: 8px; margin-bottom: 6px; }
.footer-contact .row b { color: #fff; min-width: 64px; display: inline-block; }

.mandatory-footer {
  margin-top: 28px; padding: 16px 18px;
  border: 1px solid var(--line); border-left: 3px solid var(--cyan);
  border-radius: 10px;
  background: rgba(34, 211, 238, 0.05);
  color: var(--text-dim); font-size: 0.86rem; line-height: 1.55;
}
.mandatory-footer strong { color: #fff; }
.footer-bottom {
  margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--line-soft);
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  color: var(--text-mute); font-size: 0.85rem;
}

/* Search */
.search-box {
  display: flex; gap: 10px; align-items: center;
  border: 1px solid var(--line); border-radius: 12px; padding: 10px 14px;
  background: rgba(11, 16, 32, 0.6); max-width: 520px;
}
.search-box input {
  flex: 1; background: transparent; border: 0; color: var(--text); font-size: 0.95rem; outline: none;
}
.search-box input::placeholder { color: var(--text-mute); }
.search-results { margin-top: 18px; }
.search-empty { color: var(--text-mute); padding: 18px; border: 1px dashed var(--line); border-radius: 10px; }

/* Chips / categories */
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font-size: 0.82rem; padding: 7px 13px; border-radius: 999px;
  border: 1px solid var(--line); color: var(--text-dim); cursor: pointer;
  background: rgba(17, 24, 46, 0.5); transition: all .15s;
}
.chip:hover, .chip.active { color: #fff; border-color: var(--cyan); background: rgba(34, 211, 238, 0.10); }

/* Article list */
.article-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
@media (max-width: 980px) { .article-list { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .article-list { grid-template-columns: 1fr; } }
.article-card { display: flex; flex-direction: column; overflow: hidden; padding: 0; }
.article-card .thumb { height: 150px; background-size: cover; background-position: center; border-bottom: 1px solid var(--line); }
.article-card .body { padding: 18px 20px 20px; display: flex; flex-direction: column; gap: 8px; }
.article-card h3 { margin: 0; font-size: 1.08rem; }
.article-card .meta { color: var(--text-mute); font-size: 0.82rem; }
.article-card p { margin: 0; font-size: 0.92rem; }

/* Article page */
.article { display: grid; grid-template-columns: 1fr 280px; gap: 40px; }
@media (max-width: 980px) { .article { grid-template-columns: 1fr; } }
.article .toc { position: sticky; top: 90px; align-self: start; }
.article .toc ul { list-style: none; padding: 0; margin: 0; }
.article .toc li { margin-bottom: 8px; }
.article .toc a { color: var(--text-dim); font-size: 0.88rem; }
.article .toc a:hover { color: var(--cyan); }
.prose h2 { margin-top: 36px; }
.prose h3 { margin-top: 22px; color: var(--purple-2); }
.prose p, .prose li { color: var(--text-dim); }
.prose ul { padding-left: 1.2em; }
.prose li { margin-bottom: 6px; }
.prose .callout {
  border: 1px solid var(--line); border-left: 3px solid var(--purple);
  padding: 14px 16px; border-radius: 10px; background: rgba(124, 92, 255, 0.06);
  margin: 18px 0;
}
.prose .callout.warn { border-left-color: #ffd479; background: rgba(255, 212, 121, 0.06); }

.related { margin-top: 50px; }

/* Glossary */
.glossary-list { display: grid; grid-template-columns: 1fr; gap: 14px; }
.glossary-item { padding: 18px 20px; }
.glossary-item .term { color: #fff; font-weight: 700; }
.glossary-item .term .ko { color: var(--cyan); margin-left: 10px; font-weight: 500; font-size: 0.92rem; }

/* Forms */
.form { display: grid; gap: 16px; max-width: 620px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { color: var(--text); font-weight: 600; font-size: 0.92rem; }
.field label .req { color: var(--cyan); }
.field input, .field select, .field textarea {
  background: rgba(11, 16, 32, 0.7); border: 1px solid var(--line);
  color: var(--text); padding: 11px 13px; border-radius: 10px; font-size: 0.95rem;
  font-family: inherit; outline: none; transition: border-color .15s;
}
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--cyan); }
.field .err { color: #ff8a8a; font-size: 0.82rem; min-height: 1em; }
.form-status { padding: 14px 16px; border-radius: 10px; font-size: 0.92rem; }
.form-status.ok { background: rgba(45, 212, 191, 0.10); border: 1px solid rgba(45, 212, 191, 0.4); color: #b6f7e6; }
.form-status.bad { background: rgba(255, 138, 138, 0.08); border: 1px solid rgba(255, 138, 138, 0.4); color: #ffcaca; }

/* Cookie banner */
.cookie-banner {
  position: fixed; left: 16px; right: 16px; bottom: 16px; z-index: 80;
  max-width: 760px; margin: 0 auto;
  background: rgba(11, 16, 32, 0.96); border: 1px solid var(--line);
  border-radius: 14px; padding: 18px 20px; box-shadow: var(--shadow);
  display: flex; gap: 16px; align-items: center; flex-wrap: wrap;
}
.cookie-banner .text { flex: 1; min-width: 240px; color: var(--text-dim); font-size: 0.9rem; }
.cookie-banner .text a { color: var(--cyan); }
.cookie-banner .actions { display: flex; gap: 8px; }
@media (max-width: 560px) { .cookie-banner { left: 10px; right: 10px; bottom: 10px; padding: 14px; } }

/* Page header */
.page-head { padding: 56px 0 28px; }
.page-head .lead { margin-top: 14px; }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; counter-reset: step; }
@media (max-width: 880px) { .steps { grid-template-columns: 1fr; } }
.step { position: relative; padding: 22px; }
.step::before {
  counter-increment: step; content: counter(step);
  position: absolute; top: -14px; left: 22px;
  width: 30px; height: 30px; border-radius: 50%;
  background: var(--accent-grad); color: #070b16; font-weight: 800;
  display: grid; place-items: center; font-size: 0.9rem;
}

/* Table */
.tbl { width: 100%; border-collapse: collapse; }
.tbl th, .tbl td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--line); font-size: 0.92rem; }
.tbl th { color: #fff; font-weight: 600; }
.tbl td { color: var(--text-dim); }
.tbl tr:hover td { background: rgba(34, 211, 238, 0.04); }

/* Misc */
.muted { color: var(--text-mute); }
.divider { height: 1px; background: var(--line-soft); margin: 36px 0; border: 0; }
.breadcrumb { color: var(--text-mute); font-size: 0.86rem; margin-bottom: 18px; }
.breadcrumb a { color: var(--text-dim); }
.breadcrumb a:hover { color: var(--cyan); }
.tag-row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }
.badge { font-size: 0.74rem; padding: 4px 10px; border-radius: 999px; border: 1px solid var(--line); color: var(--text-dim); }
.badge.purple { color: var(--purple-2); border-color: rgba(124,92,255,0.4); background: rgba(124,92,255,0.08); }
.badge.cyan { color: var(--cyan); border-color: rgba(34,211,238,0.4); background: rgba(34,211,238,0.08); }
.badge.teal { color: var(--teal); border-color: rgba(45,212,191,0.4); background: rgba(45,212,191,0.08); }