/* 한강북스 — 다크 에디토리얼 템플릿 */

:root {
  --bg: #0d0f14;
  --surface: #161922;
  --surface2: #1e2230;
  --text: #e8eaef;
  --muted: #8b92a5;
  --accent: #6ee7b7;
  --accent2: #818cf8;
  --border: rgba(255,255,255,0.08);
  --font: 'Noto Sans KR', sans-serif;
  --font-display: 'Space Grotesk', sans-serif;
  --max: 1200px;
  --header-h: 70px;
  --radius: 10px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; height: auto; object-fit: cover; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.skip-link {
  position: absolute; top: -100px; left: 1rem;
  background: var(--accent); color: var(--bg);
  padding: 0.5rem 1rem; z-index: 9999; border-radius: 4px;
}
.skip-link:focus { top: 1rem; }

/* Header */
.site-header {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--header-h);
  background: rgba(13,15,20,0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
}

.header-inner {
  max-width: var(--max); margin: 0 auto; height: 100%;
  padding: 0 1.5rem; display: flex; align-items: center; gap: 2rem;
}

.logo {
  display: flex; align-items: center; gap: 0.6rem;
  text-decoration: none; color: var(--text); font-weight: 700;
}

.logo-mark {
  width: 34px; height: 34px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: var(--bg); border-radius: 8px;
  display: grid; place-items: center;
  font-family: var(--font-display); font-size: 0.7rem; font-weight: 700;
}

.logo-text { font-family: var(--font-display); letter-spacing: -0.02em; }

.main-nav { display: flex; gap: 1.75rem; margin-left: auto; }
.main-nav a { color: var(--muted); font-size: 0.9rem; text-decoration: none; transition: color 0.2s; }
.main-nav a:hover { color: var(--text); text-decoration: none; }

.header-cta {
  background: var(--accent); color: var(--bg);
  padding: 0.55rem 1.2rem; border-radius: 999px;
  font-size: 0.85rem; font-weight: 600; text-decoration: none;
  transition: opacity 0.2s;
}
.header-cta:hover { opacity: 0.85; text-decoration: none; }

.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0.75rem 1.5rem; border-radius: 999px;
  font-family: var(--font); font-size: 0.9rem; font-weight: 500;
  border: none; cursor: pointer; transition: all 0.2s;
}
.btn-primary { background: var(--accent); color: var(--bg); }
.btn-primary:hover { opacity: 0.9; }
.btn-outline { background: transparent; color: var(--text); border: 1px solid var(--border); text-decoration: none; }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.btn-small { padding: 0.45rem 1rem; font-size: 0.8rem; background: var(--surface2); color: var(--accent); border: 1px solid var(--border); }
.btn-small:hover { background: var(--accent); color: var(--bg); }

/* Hero */
.hero {
  padding-top: calc(var(--header-h) + 3rem);
  position: relative; min-height: 90vh;
}

.hero-bg {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 60% 50% at 70% 30%, rgba(110,231,183,0.08), transparent),
              radial-gradient(ellipse 40% 40% at 20% 80%, rgba(129,140,248,0.06), transparent);
  pointer-events: none;
}

.hero-content {
  max-width: var(--max); margin: 0 auto; padding: 2rem 1.5rem 3rem;
  display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center;
}

.hero-label {
  font-family: var(--font-display); font-size: 0.75rem;
  letter-spacing: 0.15em; color: var(--accent); margin-bottom: 1rem;
}

.hero-left h1 {
  font-family: var(--font-display); font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 700; line-height: 1.15; margin-bottom: 1.25rem;
}

.hero-left h1 span {
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

.hero-desc { color: var(--muted); max-width: 420px; margin-bottom: 2rem; }

.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 2rem; }

.hero-stack { position: relative; border-radius: var(--radius); overflow: hidden; }
.hero-stack img { width: 100%; aspect-ratio: 4/5; }

.hero-badge {
  position: absolute; bottom: 1.5rem; left: 1.5rem;
  background: rgba(13,15,20,0.9); backdrop-filter: blur(8px);
  padding: 1rem 1.25rem; border-radius: var(--radius);
  border: 1px solid var(--border);
}
.hero-badge strong { display: block; font-family: var(--font-display); font-size: 1.5rem; color: var(--accent); }
.hero-badge span { font-size: 0.8rem; color: var(--muted); }

.hero-strip {
  max-width: var(--max); margin: 0 auto; padding: 0 1.5rem 3rem;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem;
}

.strip-item {
  background: var(--surface); border: 1px solid var(--border);
  padding: 1.25rem; border-radius: var(--radius); text-align: center;
  font-size: 0.85rem; color: var(--muted);
}
.strip-item strong { display: block; font-family: var(--font-display); font-size: 1.25rem; color: var(--text); margin-bottom: 0.25rem; }

/* Sections */
.section { max-width: var(--max); margin: 0 auto; padding: 5rem 1.5rem; }

.section-tag {
  display: inline-block; font-family: var(--font-display);
  font-size: 0.7rem; letter-spacing: 0.12em;
  color: var(--accent); margin-bottom: 0.75rem;
}

.section-head { margin-bottom: 2.5rem; }
.section-head h2 { font-family: var(--font-display); font-size: 2rem; margin-bottom: 0.5rem; }
.section-head p { color: var(--muted); }

/* Books */
.book-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem;
}

.book-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  transition: transform 0.25s, border-color 0.25s;
}
.book-card:hover { transform: translateY(-4px); border-color: rgba(110,231,183,0.3); }
.book-card.highlight { grid-column: span 1; }

.book-card figure { position: relative; aspect-ratio: 3/4; overflow: hidden; }
.book-card figure img { width: 100%; height: 100%; transition: transform 0.4s; }
.book-card:hover figure img { transform: scale(1.05); }

.book-tag {
  position: absolute; top: 0.75rem; left: 0.75rem;
  background: var(--accent); color: var(--bg);
  font-size: 0.65rem; font-weight: 700; letter-spacing: 0.05em;
  padding: 0.25rem 0.6rem; border-radius: 4px;
}
.book-tag.new { background: var(--accent2); }
.book-tag.ind { background: #f472b6; }

.book-body { padding: 1.25rem; }
.book-body h3 { font-size: 1rem; margin-bottom: 0.25rem; }
.book-body .author { font-size: 0.8rem; color: var(--muted); margin-bottom: 1rem; }
.book-foot { display: flex; justify-content: space-between; align-items: center; }
.price { font-family: var(--font-display); font-weight: 700; color: var(--accent); }

/* Categories */
.categories-section { background: var(--surface); max-width: none; }
.cat-layout { max-width: var(--max); margin: 0 auto; padding: 5rem 1.5rem; }

.cat-header { margin-bottom: 2rem; }
.cat-header h2 { font-family: var(--font-display); font-size: 2rem; margin-bottom: 0.5rem; }
.cat-header p { color: var(--muted); }

.cat-tabs { display: flex; gap: 0.5rem; margin-bottom: 2rem; flex-wrap: wrap; }

.cat-tab {
  background: var(--surface2); border: 1px solid var(--border);
  color: var(--muted); padding: 0.6rem 1.25rem; border-radius: 999px;
  font-family: var(--font); font-size: 0.85rem; cursor: pointer;
  transition: all 0.2s;
}
.cat-tab.active, .cat-tab:hover { background: var(--accent); color: var(--bg); border-color: var(--accent); }

.cat-panel-inner {
  display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center;
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 2rem;
}

.cat-img { border-radius: var(--radius); overflow: hidden; }
.cat-img img { width: 100%; aspect-ratio: 7/5; }
.cat-desc { color: var(--muted); margin-bottom: 1.25rem; }
.cat-list { list-style: none; }
.cat-list li { padding: 0.5rem 0; border-bottom: 1px solid var(--border); font-size: 0.9rem; }
.cat-list strong { color: var(--accent); float: right; }

/* About */
.about-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center; }

.about-visual { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.about-main { grid-row: span 2; }
.about-visual figure { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); }
.about-visual img { width: 100%; height: 100%; min-height: 180px; }

.about-text h2 { font-family: var(--font-display); font-size: 2rem; margin-bottom: 1rem; }
.about-text p { color: var(--muted); margin-bottom: 1rem; }

.about-values { list-style: none; margin-top: 1.5rem; }
.about-values li {
  padding: 0.75rem 0; border-left: 2px solid var(--accent);
  padding-left: 1rem; margin-bottom: 0.5rem; font-size: 0.9rem;
}

/* Reviews */
.reviews-section h2 { font-family: var(--font-display); font-size: 2rem; margin-bottom: 2rem; }

.reviews-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }

.review-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem;
}
.review-card p { font-style: italic; color: var(--muted); margin-bottom: 1rem; font-size: 0.9rem; }
.review-card footer { font-size: 0.8rem; color: var(--accent); }

/* Policy */
.policy-section h2 { font-family: var(--font-display); font-size: 2rem; margin-bottom: 2rem; }

.policy-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem;
}

.policy-grid article {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem;
}
.policy-grid h3 { font-size: 0.95rem; margin-bottom: 0.75rem; color: var(--accent); }
.policy-grid p { font-size: 0.85rem; color: var(--muted); line-height: 1.6; }

/* Contact */
.contact-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; }

.contact-info h2 { font-family: var(--font-display); font-size: 2rem; margin-bottom: 1rem; }
.contact-info p { color: var(--muted); margin-bottom: 1.5rem; }
.contact-info address { font-style: normal; font-size: 0.9rem; }
.contact-info address p { margin-bottom: 0.5rem; color: var(--text); }

.contact-form {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 2rem;
}
.contact-form label { display: block; font-size: 0.85rem; margin-bottom: 0.35rem; color: var(--muted); }
.contact-form input, .contact-form select, .contact-form textarea {
  width: 100%; background: var(--bg); border: 1px solid var(--border);
  color: var(--text); padding: 0.7rem 1rem; border-radius: 8px;
  font-family: var(--font); font-size: 0.9rem; margin-bottom: 1rem;
}
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus {
  outline: none; border-color: var(--accent);
}
.checkbox-label { display: flex; align-items: flex-start; gap: 0.5rem; font-size: 0.85rem; cursor: pointer; }
.checkbox-label input { width: auto; margin: 0; }

.form-note { font-size: 0.85rem; margin-top: 0.75rem; }
.form-note.error { color: #f87171; }
.form-note.success { color: var(--accent); }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 1.5rem; margin-top: 2rem;
}

.footer-inner {
  max-width: var(--max); margin: 0 auto;
  display: flex; flex-wrap: wrap; align-items: center; gap: 1.5rem;
}

.footer-brand { display: flex; align-items: center; gap: 0.75rem; }
.footer-brand p { font-size: 0.85rem; color: var(--muted); }

.footer-nav { display: flex; gap: 1.5rem; margin-left: auto; flex-wrap: wrap; }
.footer-nav a { color: var(--muted); font-size: 0.85rem; text-decoration: none; }
.footer-nav a:hover { color: var(--text); }

.footer-copy { width: 100%; font-size: 0.8rem; color: var(--muted); margin-top: 0.5rem; }

/* Cookie & Toast */
.cookie-banner {
  position: fixed; bottom: 1.5rem; left: 1.5rem; right: 1.5rem;
  max-width: 480px; background: var(--surface2);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1rem 1.25rem; display: flex; align-items: center; gap: 1rem;
  z-index: 2000; box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}
.cookie-banner p { font-size: 0.85rem; color: var(--muted); flex: 1; }

.toast {
  position: fixed; bottom: 2rem; left: 50%; transform: translateX(-50%);
  background: var(--accent); color: var(--bg);
  padding: 0.85rem 1.5rem; border-radius: 999px;
  font-size: 0.9rem; font-weight: 500; z-index: 3000;
  box-shadow: 0 8px 24px rgba(110,231,183,0.3);
}

/* Responsive */
@media (max-width: 900px) {
  .hero-content, .about-layout, .contact-layout, .cat-panel-inner { grid-template-columns: 1fr; }
  .book-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid, .policy-grid { grid-template-columns: 1fr; }
  .hero-strip { grid-template-columns: repeat(2, 1fr); }
  .about-main { grid-row: auto; }
}

@media (max-width: 640px) {
  .nav-toggle { display: flex; margin-left: auto; }
  .main-nav {
    position: fixed; top: var(--header-h); left: 0; right: 0;
    background: var(--bg); flex-direction: column; padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%); transition: transform 0.3s;
  }
  .main-nav.open { transform: translateY(0); }
  .header-cta { display: none; }
  .book-grid { grid-template-columns: 1fr; }
  .hero-strip { grid-template-columns: 1fr 1fr; }
}