/* ===========================================================
   이성과 본질 (Reason & Essence) — Publisher Site Stylesheet
   Minimal / Modern / Academic tone
   =========================================================== */

:root {
  --color-bg: #f7f5f1;
  --color-bg-alt: #efece5;
  --color-navy: #131b2e;
  --color-navy-soft: #1c2942;
  --color-ink: #1a1a1a;
  --color-ink-soft: #4a4a48;
  --color-gold: #b8934f;
  --color-gold-soft: #d9bd88;
  --color-line: #ddd8cd;
  --color-white: #ffffff;

  --font-serif: 'Noto Serif KR', 'Georgia', serif;
  --font-sans: 'Pretendard', 'Noto Sans KR', -apple-system, sans-serif;

  --max-width: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  word-break: keep-all;
  overflow-wrap: break-word;
}

img { max-width: 100%; display: block; }

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

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--color-navy);
  margin: 0 0 0.6em;
  letter-spacing: -0.01em;
}

p { margin: 0 0 1em; }

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- Header ---------- */

.site-header {
  background: var(--color-navy);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  position: sticky;
  top: 0;
  z-index: 50;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
}

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

.brand img {
  height: 46px;
  width: auto;
}

@media (max-width: 460px) {
  .brand img { height: 36px; }
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-text .kor {
  font-family: var(--font-serif);
  font-size: 20px;
  color: var(--color-white);
  letter-spacing: 0.02em;
}

.brand-text .eng {
  font-size: 11px;
  color: var(--color-gold-soft);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-top: 2px;
}

.main-nav ul {
  list-style: none;
  display: flex;
  gap: 34px;
  margin: 0;
  padding: 0;
}

.main-nav a {
  color: rgba(255,255,255,0.78);
  font-size: 15px;
  letter-spacing: 0.02em;
  padding: 6px 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-gold-soft);
  border-color: var(--color-gold-soft);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-white);
  font-size: 26px;
  cursor: pointer;
}

@media (max-width: 760px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 84px;
    left: 0;
    right: 0;
    background: var(--color-navy);
    border-top: 1px solid rgba(255,255,255,0.08);
    border-bottom: 1px solid rgba(255,255,255,0.08);
  }
  .main-nav.open { display: block; }
  .main-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 8px 28px 20px;
  }
  .main-nav a {
    display: block;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }
  .nav-toggle { display: block; }
}

/* ---------- Hero ---------- */

.hero {
  background: linear-gradient(180deg, var(--color-navy) 0%, var(--color-navy-soft) 100%);
  color: var(--color-white);
  padding: 96px 0 88px;
  text-align: center;
}

.hero .eyebrow {
  color: var(--color-gold-soft);
  font-size: 13px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  margin-bottom: 22px;
}

.hero h1 {
  color: var(--color-white);
  font-size: 44px;
  line-height: 1.4;
  max-width: 760px;
  margin: 0 auto 24px;
}

.hero p.lead {
  color: rgba(255,255,255,0.72);
  font-size: 17px;
  max-width: 560px;
  margin: 0 auto 36px;
}

.btn {
  display: inline-block;
  padding: 13px 30px;
  border: 1px solid var(--color-gold-soft);
  color: var(--color-gold-soft);
  font-size: 14px;
  letter-spacing: 0.06em;
  border-radius: 2px;
  transition: background 0.2s, color 0.2s;
}

.btn:hover {
  background: var(--color-gold-soft);
  color: var(--color-navy);
}

.btn.solid {
  background: var(--color-gold);
  color: var(--color-navy);
  border-color: var(--color-gold);
}

.btn.solid:hover {
  background: var(--color-gold-soft);
}

/* ---------- Section generic ---------- */

section { padding: 88px 0; }

.section-head {
  text-align: center;
  max-width: 620px;
  margin: 0 auto 56px;
}

.section-head .eyebrow {
  color: var(--color-gold);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.section-head h2 {
  font-size: 30px;
}

.section-head p {
  color: var(--color-ink-soft);
  font-size: 15px;
}

.divider {
  width: 46px;
  height: 1px;
  background: var(--color-gold);
  margin: 22px auto 0;
}

/* ---------- Publisher intro (home) ---------- */

.intro {
  background: var(--color-bg);
}

.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.intro-grid blockquote {
  font-family: var(--font-serif);
  font-size: 22px;
  line-height: 1.75;
  color: var(--color-navy);
  margin: 0;
  padding-left: 24px;
  border-left: 2px solid var(--color-gold);
}

.intro-grid .body p {
  color: var(--color-ink-soft);
  font-size: 15.5px;
}

@media (max-width: 800px) {
  .intro-grid { grid-template-columns: 1fr; gap: 36px; }
}

/* ---------- Category pills ---------- */

.pill {
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  padding: 4px 11px;
  border-radius: 20px;
  border: 1px solid var(--color-gold-soft);
  color: var(--color-navy);
  background: rgba(184,147,79,0.10);
}

/* ---------- Book grid ---------- */

.book-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 36px 28px;
}

@media (max-width: 980px) {
  .book-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 700px) {
  .book-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 460px) {
  .book-grid { grid-template-columns: 1fr; }
}

.book-card {
  background: var(--color-white);
  border: 1px solid var(--color-line);
}

.book-card .cover {
  aspect-ratio: 2 / 3;
  overflow: hidden;
  background: var(--color-navy);
}

.book-card .cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.book-card .meta {
  padding: 18px 18px 22px;
}

.book-card .status {
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.book-card h3 {
  font-size: 17px;
  line-height: 1.4;
  margin-bottom: 6px;
}

.book-card .subtitle {
  font-size: 13px;
  color: var(--color-ink-soft);
  margin-bottom: 10px;
}

.book-card .desc {
  font-size: 13.5px;
  color: var(--color-ink-soft);
  line-height: 1.6;
  margin-bottom: 0;
}

/* Featured strip (home) */

.featured-strip {
  background: var(--color-bg-alt);
}

/* ---------- Book detail (books page: alternating rows) ---------- */

.book-row {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 44px;
  padding: 44px 0;
  border-bottom: 1px solid var(--color-line);
}

.book-row:first-of-type { padding-top: 0; }
.book-row:last-of-type { border-bottom: none; }

.book-row .cover {
  aspect-ratio: 2 / 3;
  overflow: hidden;
  box-shadow: 0 14px 30px -14px rgba(19,27,46,0.35);
}

.book-row .cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.book-row .info .status {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.book-row .info h3 {
  font-size: 24px;
  margin-bottom: 8px;
}

.book-row .info .subtitle {
  font-size: 14.5px;
  color: var(--color-ink-soft);
  font-style: italic;
  margin-bottom: 16px;
}

.book-row .info .desc {
  font-size: 15px;
  color: var(--color-ink-soft);
  max-width: 620px;
}

.book-row .info .tags {
  margin-top: 16px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

@media (max-width: 640px) {
  .book-row { grid-template-columns: 130px 1fr; gap: 24px; }
  .book-row .info h3 { font-size: 19px; }
}

/* ---------- List controls (filter + view toggle) ---------- */

.list-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 50px;
}

.list-controls .filter-bar { margin-bottom: 0; }

.view-toggle {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.view-toggle button {
  font-family: var(--font-sans);
  font-size: 13px;
  padding: 8px 16px;
  border: 1px solid var(--color-line);
  background: var(--color-white);
  color: var(--color-ink-soft);
  border-radius: 30px;
  cursor: pointer;
  transition: all 0.15s;
}

.view-toggle button.active,
.view-toggle button:hover {
  background: var(--color-navy);
  color: var(--color-white);
  border-color: var(--color-navy);
}

/* Row (list) layout for book list */

.book-list {
  display: flex;
  flex-direction: column;
}

.book-row-link {
  display: block;
  color: inherit;
}

.book-row-link:hover .book-row .info h3 {
  color: var(--color-gold);
}

/* ---------- Filter bar ---------- */

.filter-bar {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 50px;
}

.filter-bar button {
  font-family: var(--font-sans);
  font-size: 13.5px;
  padding: 9px 20px;
  border: 1px solid var(--color-line);
  background: var(--color-white);
  color: var(--color-ink-soft);
  border-radius: 30px;
  cursor: pointer;
  transition: all 0.15s;
}

.filter-bar button.active,
.filter-bar button:hover {
  background: var(--color-navy);
  color: var(--color-white);
  border-color: var(--color-navy);
}

/* ---------- Author page ---------- */

.author-hero {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 56px;
  align-items: start;
}

.author-photo {
  aspect-ratio: 3 / 4;
  background: var(--color-navy);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.4);
  font-family: var(--font-serif);
  font-size: 15px;
  border: 1px solid var(--color-line);
}

.author-hero h2 { font-size: 30px; margin-bottom: 4px; }
.author-hero .role {
  color: var(--color-gold);
  font-size: 14px;
  letter-spacing: 0.04em;
  margin-bottom: 26px;
}

.author-hero .bio p {
  font-size: 15.5px;
  color: var(--color-ink-soft);
}

/* 저자 — 지은 책 목록 */

.works {
  margin-top: 34px;
  padding-top: 26px;
  border-top: 1px solid var(--color-line);
}

.works h3 {
  font-family: var(--font-serif);
  font-size: 17px;
  color: var(--color-navy);
  margin: 0 0 16px;
}

.works-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.works-list li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px solid var(--color-line);
}

.works-list li:last-child { border-bottom: none; }

.work-title {
  font-size: 15.5px;
  color: var(--color-ink);
}

.work-meta {
  font-size: 13px;
  color: var(--color-ink-soft);
  white-space: nowrap;
  margin-left: auto;
}

@media (max-width: 520px) {
  .works-list li { flex-direction: column; gap: 3px; }
  .work-meta { margin-left: 0; }
}

@media (max-width: 720px) {
  .author-hero { grid-template-columns: 1fr; }
  .author-photo { max-width: 240px; }
}

.pillars {
  margin-top: 60px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.pillar {
  padding: 28px 24px;
  background: var(--color-white);
  border: 1px solid var(--color-line);
}

.pillar .num {
  font-family: var(--font-serif);
  color: var(--color-gold);
  font-size: 13px;
  margin-bottom: 12px;
}

.pillar h4 { font-size: 17px; margin-bottom: 10px; }
.pillar p { font-size: 14px; color: var(--color-ink-soft); margin: 0; }

@media (max-width: 720px) {
  .pillars { grid-template-columns: 1fr; }
}

/* ---------- Press page ---------- */

.press-list {
  max-width: 760px;
  margin: 0 auto;
}

.press-item {
  padding: 30px 0;
  border-bottom: 1px solid var(--color-line);
}

.press-item .date {
  font-size: 12.5px;
  color: var(--color-gold);
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.press-item h3 { font-size: 19px; margin-bottom: 8px; }
.press-item p { font-size: 14.5px; color: var(--color-ink-soft); margin: 0; }

.empty-state {
  text-align: center;
  padding: 60px 20px;
  border: 1px dashed var(--color-line);
  color: var(--color-ink-soft);
}

.empty-state h3 {
  font-size: 19px;
  margin-bottom: 10px;
}

.empty-state p { font-size: 14.5px; max-width: 460px; margin: 0 auto; }

/* ---------- Contact page ---------- */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.contact-block h3 {
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: 14px;
}

.contact-block .value {
  font-family: var(--font-serif);
  font-size: 22px;
  color: var(--color-navy);
  margin-bottom: 30px;
}

.contact-block .value a:hover { color: var(--color-gold); }

.contact-note {
  font-size: 14.5px;
  color: var(--color-ink-soft);
}

@media (max-width: 720px) {
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
}

/* ---------- Footer ---------- */

.site-footer {
  background: var(--color-navy);
  color: rgba(255,255,255,0.55);
  padding: 48px 0 36px;
  font-size: 13.5px;
}

.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.site-footer .foot-brand {
  color: rgba(255,255,255,0.85);
  font-family: var(--font-serif);
  font-size: 15px;
}

.site-footer a:hover { color: var(--color-gold-soft); }

.site-footer .foot-links {
  display: flex;
  gap: 22px;
}

/* ---------- Page banner (inner pages) ---------- */

.page-banner {
  background: var(--color-navy);
  color: var(--color-white);
  padding: 64px 0 56px;
  text-align: center;
}

.page-banner .eyebrow {
  color: var(--color-gold-soft);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.page-banner h1 {
  color: var(--color-white);
  font-size: 34px;
  margin-bottom: 12px;
}

.page-banner p {
  color: rgba(255,255,255,0.65);
  font-size: 15px;
  max-width: 520px;
  margin: 0 auto;
}

/* ---------- Book card link wrapper ---------- */

.book-card-link {
  display: block;
  color: inherit;
}

.book-card-link:hover .book-card h3 {
  color: var(--color-gold);
}

/* ---------- Book detail page ---------- */

.detail-top {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 56px;
  align-items: start;
}

.detail-cover img {
  width: 100%;
  aspect-ratio: 2 / 3;
  object-fit: cover;
  box-shadow: 0 20px 40px -16px rgba(19,27,46,0.4);
  cursor: zoom-in;
}

/* ---------- Cover lightbox (원본 크기 보기) ---------- */

.cover-lightbox {
  position: fixed;
  inset: 0;
  z-index: 320;
  display: none;
}

.cover-lightbox.open { display: block; }

.cover-lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(19, 27, 46, 0.85);
}

.cover-lightbox-inner {
  position: relative;
  z-index: 1;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.cover-lightbox-inner img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  box-shadow: 0 30px 60px -20px rgba(0,0,0,0.6);
  cursor: zoom-out;
}

.cover-lightbox-close {
  position: absolute;
  top: 20px;
  right: 28px;
  z-index: 2;
  border: 1px solid rgba(255,255,255,0.4);
  background: rgba(255,255,255,0.08);
  color: var(--color-white);
  border-radius: 6px;
  width: 40px;
  height: 40px;
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
}

.cover-lightbox-close:hover {
  background: rgba(255,255,255,0.2);
}

.detail-info h1 {
  font-size: 32px;
  margin: 14px 0 8px;
}

.detail-info .subtitle {
  font-size: 15px;
  color: var(--color-ink-soft);
  font-style: italic;
  margin-bottom: 18px;
}

.detail-info .status {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--color-gold);
  text-transform: uppercase;
}

.detail-info .desc {
  font-size: 15.5px;
  color: var(--color-ink-soft);
  max-width: 560px;
}

.detail-sections {
  max-width: 720px;
  margin: 64px auto 0;
}

.detail-section {
  padding: 32px 0;
  border-top: 1px solid var(--color-line);
}

.detail-section h2 {
  font-size: 20px;
  margin-bottom: 14px;
}

.detail-section p {
  color: var(--color-ink-soft);
  font-size: 15.5px;
}

.toc-part {
  margin-bottom: 22px;
}

.toc-part:last-child {
  margin-bottom: 0;
}

.toc-part-title {
  font-family: var(--font-serif);
  font-size: 15.5px;
  color: var(--color-navy);
  margin: 0 0 8px;
}

.toc-list {
  margin: 0;
  padding-left: 20px;
  color: var(--color-ink-soft);
  font-size: 14.5px;
  line-height: 1.9;
}

.toc-note {
  margin-top: 12px;
  font-size: 12.5px;
  color: #8a857a;
}

@media (max-width: 680px) {
  .detail-top { grid-template-columns: 1fr; }
  .detail-cover { max-width: 220px; }
}

/* ---------- Book preview modal ---------- */

.preview-open { margin-top: 22px; }

.preview-modal {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: none;
}

.preview-modal.open { display: block; }

body.preview-lock { overflow: hidden; }

.preview-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(19, 27, 46, 0.72);
}

.preview-reader {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  max-width: 920px;
  height: min(720px, calc(100vh - 64px));
  margin: 32px auto;
  background: var(--color-white);
  border-radius: 6px;
  overflow: hidden;
  box-shadow: 0 30px 60px -20px rgba(0,0,0,0.4);
}

.preview-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 28px;
  border-bottom: 1px solid var(--color-line);
  flex-shrink: 0;
}

.preview-kicker {
  display: block;
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: 6px;
}

.preview-header h2 {
  margin: 0;
  font-size: 19px;
}

.preview-tools {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.preview-tool,
.preview-close {
  border: 1px solid var(--color-line);
  background: var(--color-white);
  color: var(--color-ink-soft);
  border-radius: 6px;
  padding: 6px 11px;
  font-size: 13px;
  cursor: pointer;
  font-family: var(--font-sans);
}

.preview-tool:hover,
.preview-close:hover {
  background: var(--color-navy);
  color: var(--color-white);
  border-color: var(--color-navy);
}

.preview-close {
  font-size: 18px;
  line-height: 1;
  padding: 4px 11px;
}

.preview-body {
  display: grid;
  grid-template-columns: 170px 1fr;
  flex: 1;
  min-height: 0;
}

.preview-book {
  padding: 26px 20px;
  border-right: 1px solid var(--color-line);
  background: var(--color-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 10px;
}

.preview-book img {
  width: 100%;
  aspect-ratio: 2 / 3;
  object-fit: cover;
  box-shadow: 0 14px 26px -14px rgba(19,27,46,0.4);
}

.preview-book strong {
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.4;
}

.preview-book span {
  font-size: 12px;
  color: var(--color-ink-soft);
}

.preview-page {
  padding: 34px 42px;
  overflow-y: auto;
  --preview-font-scale: 1;
}

.preview-page-label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.preview-page h3 {
  font-family: var(--font-serif);
  font-size: calc(19px * var(--preview-font-scale));
  margin: 0 0 20px;
}

.preview-copy {
  font-size: calc(15.5px * var(--preview-font-scale));
  line-height: 1.9;
  color: var(--color-ink);
}

.preview-copy p { margin: 0 0 1.2em; }
.preview-copy p:last-child { margin-bottom: 0; }

.preview-lead {
  font-family: var(--font-serif);
  font-size: 1.05em;
}

.preview-copy blockquote {
  margin: 0;
  padding-left: 16px;
  border-left: 2px solid var(--color-gold-soft);
  color: var(--color-ink-soft);
  font-style: italic;
}

.preview-note {
  font-size: 0.85em;
  color: #8a857a;
  font-style: italic;
}

.preview-copy ol {
  padding-left: 20px;
  color: var(--color-ink-soft);
}

.preview-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px;
  border-top: 1px solid var(--color-line);
  flex-shrink: 0;
}

.preview-nav {
  border: 1px solid var(--color-line);
  background: var(--color-white);
  color: var(--color-ink-soft);
  border-radius: 30px;
  padding: 9px 20px;
  font-size: 13px;
  cursor: pointer;
  font-family: var(--font-sans);
}

.preview-nav:hover:not(:disabled) {
  background: var(--color-navy);
  color: var(--color-white);
  border-color: var(--color-navy);
}

.preview-nav:disabled {
  opacity: 0.4;
  cursor: default;
}

#preview-progress {
  font-size: 12.5px;
  color: var(--color-ink-soft);
}

@media (max-width: 680px) {
  .preview-reader { margin: 0; height: 100vh; border-radius: 0; max-width: 100%; }
  .preview-body { grid-template-columns: 1fr; }
  .preview-book { display: none; }
  .preview-page { padding: 26px 22px; }
}