/* LuckyLab shared styles: theme tokens, header/footer, content pages */

:root {
  --bg-gradient: radial-gradient(circle at 50% 0%, #1e1b4b 0%, #0f172a 45%, #030712 100%);
  --card-bg: rgba(30, 41, 59, 0.7);
  --card-border: rgba(255, 255, 255, 0.1);
  --accent: #f59e0b;
  --accent-glow: rgba(245, 158, 11, 0.35);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-soft: #e2e8f0;
  --badge-text: #fbbf24;
  --title-gradient: linear-gradient(135deg, #ffffff 0%, #cbd5e1 50%, #f59e0b 100%);
  --tint-rgb: 255, 255, 255;
  --panel-rgb: 15, 23, 42;
  --shadow-rgb: 0, 0, 0;
  --shadow-alpha: 0.5;
  --nav-bg: rgba(3, 7, 18, 0.72);
  --nav-solid: #0b1120;
  --link: #fbbf24;
  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg-gradient: radial-gradient(circle at 50% 0%, #fff7ed 0%, #f1f5f9 45%, #e2e8f0 100%);
  --card-bg: rgba(255, 255, 255, 0.78);
  --card-border: rgba(15, 23, 42, 0.1);
  --accent: #d97706;
  --accent-glow: rgba(245, 158, 11, 0.25);
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-soft: #334155;
  --badge-text: #b45309;
  --title-gradient: linear-gradient(135deg, #0f172a 0%, #334155 50%, #d97706 100%);
  --tint-rgb: 15, 23, 42;
  --panel-rgb: 255, 255, 255;
  --shadow-alpha: 0.15;
  --nav-bg: rgba(255, 255, 255, 0.8);
  --nav-solid: #ffffff;
  --link: #b45309;
  color-scheme: light;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

body.site {
  margin: 0;
  min-height: 100vh;
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-main);
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, 'Apple SD Gothic Neo', 'Malgun Gothic', sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  padding: 0.6rem 1rem;
  background: var(--accent);
  color: #0f172a;
  font-weight: 700;
  border-radius: 0 0 0.5rem 0;
}

.skip-link:focus { left: 0; }

/* ---------- Header / navigation ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--card-border);
}

.site-header-inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0.65rem 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--text-main);
  text-decoration: none;
  font-weight: 900;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.site-logo-mark {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #fbbf24, #d97706);
  color: #0f172a;
  font-size: 1rem;
}

.site-nav {
  margin-left: auto;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.site-nav a {
  display: block;
  padding: 0.45rem 0.75rem;
  border-radius: 0.6rem;
  color: var(--text-soft);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 600;
  white-space: nowrap;
  transition: background 0.2s ease, color 0.2s ease;
}

.site-nav a:hover { background: rgba(var(--tint-rgb), 0.08); color: var(--text-main); }

.site-nav a[aria-current="page"] {
  color: var(--accent);
  background: rgba(245, 158, 11, 0.12);
}

.icon-btn {
  width: 38px;
  height: 38px;
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  color: var(--text-main);
  cursor: pointer;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.icon-btn:hover { border-color: var(--accent); }

.site-header .theme-btn .icon-sun { display: none; }
:root[data-theme="light"] .site-header .theme-btn .icon-sun { display: block; }
:root[data-theme="light"] .site-header .theme-btn .icon-moon { display: none; }

.menu-btn { display: none; }

.site a:focus-visible,
.site button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (max-width: 820px) {
  .menu-btn { display: inline-flex; margin-left: auto; }
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin: 0;
    /* Solid: a backdrop blur can't reach through the header's own blur layer */
    background: var(--nav-solid);
    border-bottom: 1px solid var(--card-border);
    box-shadow: 0 16px 32px -12px rgba(var(--shadow-rgb), var(--shadow-alpha));
    display: none;
  }
  .site-nav.open { display: block; }
  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
    padding: 0.5rem 1rem 1rem;
  }
  .site-nav a { padding: 0.75rem 0.85rem; font-size: 1rem; }
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: 4rem;
  border-top: 1px solid var(--card-border);
  background: rgba(var(--panel-rgb), 0.35);
}

.site-footer-inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 2rem 1rem 2.5rem;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.site-footer h2 {
  font-size: 0.95rem;
  color: var(--text-main);
  margin: 0 0 0.75rem;
}

.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li + li { margin-top: 0.4rem; }

.site-footer a {
  color: var(--text-muted);
  text-decoration: none;
}

.site-footer a:hover { color: var(--accent); text-decoration: underline; }

.site-footer .footer-about p { margin: 0.5rem 0 0; line-height: 1.7; }

.site-footer .footer-bottom {
  grid-column: 1 / -1;
  padding-top: 1.25rem;
  border-top: 1px solid var(--card-border);
  font-size: 0.82rem;
}

@media (max-width: 720px) {
  .site-footer-inner { grid-template-columns: 1fr 1fr; }
  .site-footer .footer-about { grid-column: 1 / -1; }
}

/* ---------- Content pages ---------- */
.page {
  max-width: 820px;
  margin: 0 auto;
  padding: 2.5rem 1rem 0;
}

.page-wide { max-width: 1040px; }

.breadcrumb {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.breadcrumb a { color: var(--text-muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span[aria-hidden] { margin: 0 0.4rem; }

.page-title {
  font-size: clamp(1.8rem, 4.5vw, 2.6rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.25;
  margin: 0 0 0.75rem;
  background: var(--title-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-lead {
  font-size: 1.08rem;
  color: var(--text-soft);
  margin: 0 0 1.25rem;
  line-height: 1.75;
}

.meta-line {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.content-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 1.5rem;
  padding: clamp(1.25rem, 4vw, 2.25rem);
  box-shadow: 0 20px 40px -15px rgba(var(--shadow-rgb), var(--shadow-alpha));
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.content-card + .content-card { margin-top: 1.5rem; }

/* Long-form text */
.prose {
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--text-soft);
  word-break: keep-all;
  overflow-wrap: break-word;
}

.prose > :first-child { margin-top: 0; }

.prose h2 {
  font-size: 1.45rem;
  line-height: 1.35;
  color: var(--text-main);
  margin: 2.5rem 0 0.9rem;
  letter-spacing: -0.02em;
}

.prose h3 {
  font-size: 1.15rem;
  color: var(--text-main);
  margin: 1.75rem 0 0.6rem;
}

.prose p { margin: 0 0 1.1rem; }

.prose ul, .prose ol { margin: 0 0 1.2rem; padding-left: 1.4rem; }
.prose li { margin: 0.35rem 0; }

.prose a { color: var(--link); text-underline-offset: 3px; }

.prose strong { color: var(--text-main); }

.prose blockquote,
.prose .callout {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  border-left: 4px solid var(--accent);
  border-radius: 0 0.9rem 0.9rem 0;
  background: rgba(245, 158, 11, 0.08);
  color: var(--text-soft);
}

.prose .callout p:last-child { margin-bottom: 0; }

.prose .callout-title {
  display: block;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.35rem;
}

.prose code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  padding: 0.1rem 0.35rem;
  border-radius: 0.35rem;
  background: rgba(var(--tint-rgb), 0.08);
}

.prose pre {
  overflow-x: auto;
  padding: 1rem 1.1rem;
  border-radius: 0.9rem;
  background: rgba(var(--panel-rgb), 0.75);
  border: 1px solid var(--card-border);
  line-height: 1.6;
  font-size: 0.9rem;
}

.prose pre code { padding: 0; background: none; }

.table-wrap {
  overflow-x: auto;
  margin: 1.25rem 0 1.5rem;
  border: 1px solid var(--card-border);
  border-radius: 0.9rem;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  min-width: 480px;
}

.prose th, .prose td {
  padding: 0.7rem 0.9rem;
  text-align: left;
  border-bottom: 1px solid var(--card-border);
  white-space: nowrap;
}

.prose th {
  color: var(--text-main);
  background: rgba(var(--tint-rgb), 0.05);
  font-weight: 700;
}

.prose tr:last-child td { border-bottom: none; }

.prose td.num, .prose th.num { text-align: right; font-variant-numeric: tabular-nums; }

.toc {
  margin: 0 0 2rem;
  padding: 1rem 1.25rem;
  border: 1px solid var(--card-border);
  border-radius: 1rem;
  background: rgba(var(--panel-rgb), 0.4);
  font-size: 0.95rem;
}

.toc strong { display: block; margin-bottom: 0.4rem; color: var(--text-main); }
.toc ol { margin: 0; padding-left: 1.2rem; }
.toc a { color: var(--text-soft); text-decoration: none; }
.toc a:hover { color: var(--accent); text-decoration: underline; }

/* FAQ */
.faq details {
  border: 1px solid var(--card-border);
  border-radius: 0.9rem;
  background: rgba(var(--panel-rgb), 0.35);
  padding: 0 1.1rem;
}

.faq details + details { margin-top: 0.6rem; }

.faq summary {
  cursor: pointer;
  padding: 0.95rem 0;
  font-weight: 700;
  color: var(--text-main);
  list-style: none;
}

.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: 'Q. '; color: var(--accent); }
.faq details[open] summary { border-bottom: 1px solid var(--card-border); }
.faq details > div { padding: 0.9rem 0 1rem; }
.faq details > div p:last-child { margin-bottom: 0; }

/* Cards grid (home, guide list, related) */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1rem;
}

.link-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.35rem;
  border-radius: 1.25rem;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  color: var(--text-main);
  text-decoration: none;
  transition: transform 0.2s ease, border-color 0.2s ease;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.link-card:hover { transform: translateY(-3px); border-color: var(--accent); }

.link-card .card-emoji { font-size: 2rem; line-height: 1; }
.link-card .card-kicker { font-size: 0.78rem; font-weight: 700; color: var(--accent); letter-spacing: 0.02em; }
.link-card h3 { margin: 0; font-size: 1.12rem; line-height: 1.4; }
.link-card p { margin: 0; font-size: 0.92rem; color: var(--text-muted); line-height: 1.65; }
.link-card .card-more { margin-top: auto; padding-top: 0.4rem; font-size: 0.88rem; font-weight: 700; color: var(--accent); }

.section-heading {
  font-size: 1.35rem;
  font-weight: 800;
  margin: 3rem 0 1rem;
  letter-spacing: -0.02em;
}

.section-heading small {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-top: 0.25rem;
  letter-spacing: 0;
}

.related { margin-top: 2.5rem; }

.btn-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.8rem 1.3rem;
  border-radius: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: #0f172a;
  box-shadow: 0 8px 20px -6px var(--accent-glow);
}

.btn-link.secondary {
  background: rgba(var(--tint-rgb), 0.08);
  color: var(--text-main);
  border: 1px solid rgba(var(--tint-rgb), 0.14);
  box-shadow: none;
}

.btn-row { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 1.5rem 0 0.5rem; }

/* Contact form */
.contact-form {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.contact-form .full { grid-column: 1 / -1; }

.field { display: flex; flex-direction: column; gap: 0.4rem; }
.field.full { grid-column: 1 / -1; }

.field label {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-muted);
}

.field .required { color: var(--accent); }

.input {
  width: 100%;
  font: inherit;
  font-size: 0.95rem;
  color: var(--text-main);
  background: rgba(var(--panel-rgb), 0.8);
  border: 1px solid rgba(var(--tint-rgb), 0.14);
  border-radius: 0.75rem;
  padding: 0.75rem 1rem;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.input:focus { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-glow); }
.input::placeholder { color: var(--text-muted); opacity: 0.75; }
textarea.input { min-height: 160px; resize: vertical; line-height: 1.6; }

.form-note { margin: 0; font-size: 0.85rem; color: var(--text-muted); }
.form-note a { color: var(--link); }

.form-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.form-footer .btn-link { border: none; cursor: pointer; font: inherit; font-weight: 700; }
.form-footer .btn-link:disabled { opacity: 0.6; cursor: not-allowed; }

.form-status { font-size: 0.9rem; font-weight: 600; color: var(--text-muted); }
.form-status.success { color: #22c55e; }
.form-status.error { color: #ef4444; }

.hp-field { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

@media (max-width: 640px) {
  .contact-form { grid-template-columns: 1fr; }
  .form-footer .btn-link { width: 100%; justify-content: center; }
}

/* Home */
.home-hero { padding: 1.5rem 0 0.5rem; }
.home-kicker { margin: 0 0 0.75rem; font-weight: 700; color: var(--accent); }

/* Guide sections appended under the tools */
.tool-guide {
  width: 100%;
  max-width: 860px;
  margin: 2.5rem auto 0;
}