:root {
  /* Level colors */
  --color-n5: #22c55e;
  --color-n4: #14b8a6;
  --color-n3: #3b82f6;
  --color-n2: #8b5cf6;
  --color-n1: #ef4444;

  /* Neutral palette */
  --color-bg: #f8f8f6;
  --color-surface: #ffffff;
  --color-border: #e4e4e0;
  --color-text: #1a1a1a;
  --color-muted: #6b6b6b;
  --color-navbar-bg: #1a1a2e;
  --color-navbar-text: #f0f0f0;

  /* Typography */
  --font-base:
    system-ui, -apple-system, "Hiragino Kaku Gothic ProN", "Hiragino Sans",
    "Yu Gothic UI", "Yu Gothic", Meiryo, sans-serif;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  /* Shadow */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1), 0 2px 4px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12), 0 4px 8px rgba(0, 0, 0, 0.06);

  /* Transitions */
  --transition: 0.2s ease;
}

/* ------------------------------------------------------------
   Reset & Base
   ------------------------------------------------------------ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-base);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1 {
  margin: 20px 0;
}

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

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

ul,
ol {
  list-style: none;
}

/* ------------------------------------------------------------
   Navbar
   ------------------------------------------------------------ */
.navbar {
  background: var(--color-navbar-bg);
  color: var(--color-navbar-text);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}

.navbar__inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xl);
  height: 56px;
}

.navbar__brand {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: #fff;
  white-space: nowrap;
  flex-shrink: 0;
}

.navbar__brand span {
  opacity: 0.6;
  font-weight: 400;
  font-size: 0.85rem;
  margin-left: 0.4em;
}

.navbar__levels {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.navbar__level {
  display: inline-flex;
  align-items: center;
  padding: 3px 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition:
    opacity var(--transition),
    transform var(--transition);
  opacity: 0.75;
}

.navbar__level:hover {
  opacity: 1;
  transform: translateY(-1px);
}

.navbar__level.active {
  opacity: 1;
}

.navbar__level.level-n5 {
  background: var(--color-n5);
  color: #fff;
}
.navbar__level.level-n4 {
  background: var(--color-n4);
  color: #fff;
}
.navbar__level.level-n3 {
  background: var(--color-n3);
  color: #fff;
}
.navbar__level.level-n2 {
  background: var(--color-n2);
  color: #fff;
}
.navbar__level.level-n1 {
  background: var(--color-n1);
  color: #fff;
}

/* ------------------------------------------------------------
   Level badge (inline)
   ------------------------------------------------------------ */
.level-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: #fff;
  vertical-align: middle;
}

.level-badge.level-n5 {
  background: var(--color-n5);
}
.level-badge.level-n4 {
  background: var(--color-n4);
}
.level-badge.level-n3 {
  background: var(--color-n3);
}
.level-badge.level-n2 {
  background: var(--color-n2);
}
.level-badge.level-n1 {
  background: var(--color-n1);
}

/* Level color helper classes (accent on level pages) */
.level-n5 {
  --level-color: var(--color-n5);
}
.level-n4 {
  --level-color: var(--color-n4);
}
.level-n3 {
  --level-color: var(--color-n3);
}
.level-n2 {
  --level-color: var(--color-n2);
}
.level-n1 {
  --level-color: var(--color-n1);
}

/* ------------------------------------------------------------
   Hero — Main Landing (compact side-by-side)
   ------------------------------------------------------------ */
.hero {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  color: #fff;
  padding: var(--space-xl) var(--space-lg);
}

.hero__inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: var(--space-3xl);
}

.hero__left {
  flex-shrink: 0;
}

.hero__label {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
  margin-bottom: var(--space-xs);
}

.hero__title {
  font-size: clamp(1.9rem, 3.5vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 6px;
}

.hero__subtitle {
  font-size: clamp(0.88rem, 1.8vw, 1.05rem);
  opacity: 0.65;
  font-weight: 400;
}

.hero__right {
  flex: 1;
  min-width: 0;
}

.hero__desc {
  font-size: 0.9rem;
  opacity: 0.68;
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.hero__jump {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

/* ------------------------------------------------------------
   Hero — Level Index Page
   ------------------------------------------------------------ */
.level-hero {
  color: #fff;
  padding: var(--space-2xl) var(--space-lg);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.level-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.18);
}

.level-hero > * {
  position: relative;
}

.level-hero--n5 {
  background: linear-gradient(135deg, #16a34a, #22c55e, #4ade80);
}
.level-hero--n4 {
  background: linear-gradient(135deg, #0d9488, #14b8a6, #2dd4bf);
}
.level-hero--n3 {
  background: linear-gradient(135deg, #1d4ed8, #3b82f6, #60a5fa);
}
.level-hero--n2 {
  background: linear-gradient(135deg, #6d28d9, #8b5cf6, #a78bfa);
}
.level-hero--n1 {
  background: linear-gradient(135deg, #b91c1c, #ef4444, #f87171);
}

.level-hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  background: rgba(255, 255, 255, 0.22);
  border: 1px solid rgba(255, 255, 255, 0.35);
  padding: 4px 16px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-md);
}

.level-hero__title {
  font-size: clamp(1.9rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-sm);
  line-height: 1.2;
}

.level-hero__subtitle {
  font-size: clamp(0.95rem, 2.2vw, 1.2rem);
  opacity: 0.88;
  margin-bottom: var(--space-lg);
}

.level-hero__desc {
  max-width: 520px;
  margin: 0 auto;
  font-size: 0.92rem;
  opacity: 0.72;
  line-height: 1.85;
}

/* ------------------------------------------------------------
   Container / Layout
   ------------------------------------------------------------ */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-3xl) var(--space-lg);
}

.section--tight {
  padding: var(--space-xl) var(--space-lg);
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section__title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.section__subtitle {
  color: var(--color-muted);
  font-size: 0.95rem;
}

/* ------------------------------------------------------------
   Cards Grid
   ------------------------------------------------------------ */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
  max-width: 1100px;
  margin: 0 auto;
}

/* Level selection cards (main landing) */
.level-card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  cursor: pointer;
  transition:
    transform var(--transition),
    box-shadow var(--transition),
    border-color var(--transition);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.level-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--level-color, #999);
  transition: height var(--transition);
}

.level-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--level-color, #999);
}

.level-card:hover::before {
  height: 6px;
}

.level-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.level-card__count {
  margin-left: auto;
  font-size: 0.78rem;
  color: var(--color-muted);
  font-weight: 500;
  white-space: nowrap;
}

.level-card__title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
}

.level-card__subtitle {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-bottom: var(--space-md);
}

.level-card__desc {
  font-size: 0.9rem;
  color: #444;
  line-height: 1.75;
  flex: 1;
}

.level-card__arrow {
  margin-top: var(--space-md);
  font-size: 0.85rem;
  color: var(--level-color, #999);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition);
}

.level-card:hover .level-card__arrow {
  gap: 8px;
}

/* Story cards (level index pages) */
.story-card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  cursor: pointer;
  transition:
    transform var(--transition),
    box-shadow var(--transition),
    border-color var(--transition);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.story-card::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--level-color, #999);
  transform: scaleX(0);
  transition: transform var(--transition);
  transform-origin: left;
}

.story-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--level-color, #ccc);
}

.story-card:hover::after {
  transform: scaleX(1);
}

.story-card__num {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--level-color, #999);
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
  opacity: 0.8;
}

.story-card__title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
  line-height: 1.4;
}

.story-card__desc {
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.7;
  flex: 1;
}

.story-card__read {
  margin-top: var(--space-md);
  font-size: 0.82rem;
  color: var(--level-color, #999);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition);
}

.story-card:hover .story-card__read {
  gap: 8px;
}

/* ------------------------------------------------------------
   Story Content Page
   ------------------------------------------------------------ */
.story-layout {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
}

.story-header {
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

.story-header__meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
}

.story-header__title {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: var(--space-sm);
}

.story-header__subtitle {
  font-size: 1rem;
  color: var(--color-muted);
}

.story-content {
  font-size: 1.1rem;
  line-height: 2.2;
  color: var(--color-text);
}

.story-content p {
  margin-bottom: 1.6em;
}

.story-content p:last-child {
  margin-bottom: 0;
}

/* Ruby / Furigana */
ruby {
  ruby-align: center;
  position: relative;
}

rb {
  font-style: normal;
}

.has-tip {
  cursor: pointer;
  position: relative;
  text-decoration: underline;
  text-decoration-style: dotted;
  text-decoration-color: rgba(0, 0, 0, 0.2);
  text-underline-offset: 4px;
  text-decoration-thickness: 2px;
  text-decoration-skip-ink: auto;
}

rt {
  font-size: 0.55em;
  color: #666;
  font-weight: 400;
}

/* Ruby popover (injected by scripts.js) */
.ruby-tip {
  position: absolute;
  bottom: calc(100% + 18px);
  left: 50%;
  transform: translateX(-50%);
  background: #fff;
  color: #333;
  border: 1px solid #ddd;
  min-width: 250px;
  padding: 15px;
  border-radius: 12px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s ease;
  z-index: 10;
  display: flex;
  flex-direction: column;
  gap: 1px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.12);
  ruby-position: unset;
  user-select: none;
  transition: all 0.2s ease;
}

/* On mobile, pin it to the bottom */
@media (max-width: 768px) {
  .has-tip {
    position: static;
  }
  .ruby-tip {
    position: fixed;
    bottom: 10px !important;
    left: 10px !important;
    right: 10px !important;
    height: 140px;
    transform: none;
  }
}

.ruby-tip::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: #ddd;
}

.ruby-tip::before {
  content: "";
  position: absolute;
  top: calc(100% - 1px);
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: #fff;
  z-index: 1;
}

.ruby-tip__kanji-group {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.ruby-tip__reading {
  font-size: 0.68rem;
  color: #888;
  letter-spacing: 0.06em;
  line-height: 1.2;
}

.ruby-tip__word {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  line-height: 1.3;
  position: relative;
}

.grammar .ruby-tip__word {
  justify-content: start;
}

.ruby-tip__kanji {
  text-align: center;
  font-size: 1.2rem;
  letter-spacing: 2px;
  position: relative;
  top: 2px;
  color: #222;
}

.ruby-tip__short {
  font-size: 0.9rem;
  font-weight: 400;
  color: #444;
}

.ruby-tip__type {
  background: #eee;
  position: absolute;
  top: -10px;
  right: -10px;
  font-size: 12px;
  padding: 1px 5px;
  border-radius: 10px;
}

.ruby-tip__desc {
  font-size: 0.9rem;
  font-weight: 400;
  color: #444;
  line-height: 1.5;
  margin-top: 5px;
  padding-top: 5px;
  white-space: normal;
  max-width: 320px;
}

.has-tip:not(:has(.has-tip:hover)):hover .ruby-tip,
.has-tip.ruby-open .ruby-tip {
  opacity: 1;
  user-select: all;
  bottom: calc(100% + 22px);
}

/* ------------------------------------------------------------
   Vocabulary Table
   ------------------------------------------------------------ */
.vocab-section {
  margin-top: var(--space-3xl);
  padding-top: var(--space-xl);
  border-top: 2px solid var(--color-border);
}

.vocab-section__title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.vocab-section__title::before {
  content: "語彙";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--level-color, #999);
  color: #fff;
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.04em;
}

.vocab-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.vocab-table thead {
  background: #f0f0ee;
}

.vocab-table th {
  padding: 10px 14px;
  text-align: left;
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-muted);
  border-bottom: 1px solid var(--color-border);
}

.vocab-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.vocab-table tbody tr:last-child td {
  border-bottom: none;
}

.vocab-table tbody tr:nth-child(even) {
  background: #fafaf8;
}

.vocab-table tbody tr:hover {
  background: #f4f4f0;
}

.vocab-word {
  font-weight: 600;
  font-size: 1rem;
}

.vocab-reading {
  color: var(--color-muted);
  font-size: 0.85rem;
}

.vocab-meaning {
  color: #333;
}

.vocab-pos {
  display: inline-block;
  font-size: 0.7rem;
  padding: 1px 6px;
  border-radius: 3px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-muted);
  font-weight: 500;
  vertical-align: middle;
  margin-left: 4px;
}

/* ------------------------------------------------------------
   Story Navigation
   ------------------------------------------------------------ */
.story-nav {
  margin-top: var(--space-3xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--space-md);
  align-items: center;
}

.story-nav__btn {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: var(--space-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  transition:
    border-color var(--transition),
    box-shadow var(--transition),
    transform var(--transition);
}

.story-nav__btn:hover {
  border-color: var(--level-color, #999);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.story-nav__btn--prev {
  text-align: left;
}
.story-nav__btn--next {
  text-align: right;
}
.story-nav__btn--disabled {
  opacity: 0.35;
  pointer-events: none;
}

.story-nav__dir {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.story-nav__title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-text);
}

.story-nav__back {
  text-align: center;
}

.story-nav__back a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--level-color, #555);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  transition:
    background var(--transition),
    border-color var(--transition);
}

.story-nav__back a:hover {
  background: var(--color-bg);
  border-color: var(--level-color, #999);
}

/* ------------------------------------------------------------
   Back / Breadcrumb Link
   ------------------------------------------------------------ */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-muted);
  padding: var(--space-sm) 0;
  transition: color var(--transition);
}

.back-link:hover {
  color: var(--color-text);
}

.back-link-wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--space-md) var(--space-lg) 0;
}

/* ------------------------------------------------------------
   Footer
   ------------------------------------------------------------ */
.footer {
  margin-top: auto;
  background: var(--color-navbar-bg);
  color: rgba(255, 255, 255, 0.55);
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  font-size: 0.85rem;
  line-height: 1.9;
}

.footer a {
  color: rgba(255, 255, 255, 0.75);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition);
}

.footer a:hover {
  color: #fff;
}

.footer__brand {
  font-weight: 700;
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.95rem;
}

.footer__levels {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--space-sm);
}

.footer__level {
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  opacity: 0.7;
  transition: opacity var(--transition);
}

.footer__level:hover {
  opacity: 1;
}

/* ------------------------------------------------------------
   Utility
   ------------------------------------------------------------ */
.text-center {
  text-align: center;
}
.mt-lg {
  margin-top: var(--space-lg);
}
.mt-xl {
  margin-top: var(--space-xl);
}
.mt-2xl {
  margin-top: var(--space-2xl);
}

/* ------------------------------------------------------------
   Responsive
   ------------------------------------------------------------ */
@media (max-width: 768px) {
  .navbar__inner {
    gap: var(--space-md);
    padding: 0 var(--space-md);
    height: 50px;
  }

  .sm-hidden {
    display: none;
  }

  .navbar__brand span {
    display: none;
  }

  .navbar__level {
    padding: 2px 9px;
    font-size: 0.76rem;
  }

  .hero {
    padding: var(--space-lg) var(--space-md);
  }

  .hero__inner {
    flex-direction: column;
    gap: var(--space-lg);
    align-items: flex-start;
  }

  .level-hero {
    padding: var(--space-xl) var(--space-md);
  }

  .section {
    padding: var(--space-2xl) var(--space-md);
  }

  .cards-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .story-layout {
    padding: var(--space-xl) var(--space-md);
  }

  .story-nav {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
  }

  .story-nav__back {
    grid-column: 1 / -1;
    order: -1;
  }

  .vocab-table {
    font-size: 0.82rem;
  }

  .vocab-table th,
  .vocab-table td {
    padding: 8px 10px;
  }
}

@media (max-width: 480px) {
  .navbar__levels {
    gap: 4px;
  }

  .navbar__level {
    padding: 2px 7px;
    font-size: 0.72rem;
  }

  .cards-grid {
    grid-template-columns: 1fr;
  }

  .story-content {
    font-size: 1rem;
  }
}

/* ------------------------------------------------------------
   Story Page — Alternative Navbar (individual story pages)
   ------------------------------------------------------------ */
.navbar .nav-brand {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  white-space: nowrap;
  flex-shrink: 0;
}

.navbar .nav-links {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-left: auto;
}

.navbar .nav-links a {
  display: inline-flex;
  align-items: center;
  padding: 3px 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  background: rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.72);
  transition:
    background var(--transition),
    color var(--transition);
}

.navbar .nav-links a:hover,
.navbar .nav-links a.active {
  background: rgba(255, 255, 255, 0.22);
  color: #fff;
}

/* ------------------------------------------------------------
   Story Page — Content Layout
   ------------------------------------------------------------ */
.story-container {
  max-width: 740px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
}

.story-header {
  padding-left: var(--space-lg);
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

.story-header.level-n5-header {
  border-left: 4px solid var(--color-n5);
}
.story-header.level-n4-header {
  border-left: 4px solid var(--color-n4);
}
.story-header.level-n3-header {
  border-left: 4px solid var(--color-n3);
}
.story-header.level-n2-header {
  border-left: 4px solid var(--color-n2);
}
.story-header.level-n1-header {
  border-left: 4px solid var(--color-n1);
}

.story-title {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 800;
  line-height: 1.3;
  margin: var(--space-sm) 0;
}

.story-subtitle {
  font-size: 1rem;
  color: var(--color-muted);
  margin-top: var(--space-xs);
}

.story-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.meta-tag {
  font-size: 0.78rem;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-muted);
  font-weight: 500;
}

.story-body {
  font-size: 1.1rem;
  line-height: 2.2;
  color: var(--color-text);
}

.story-body p {
  margin-bottom: 1.6em;
}

.story-body p:last-child {
  margin-bottom: 0;
}

.vocab-subtitle {
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--color-muted);
  margin-left: 0.4em;
}

/* Story navigation — footer bar */
.story-navigation {
  margin-top: var(--space-3xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
  display: flex;
  gap: var(--space-md);
  justify-content: space-between;
  flex-wrap: wrap;
  align-items: center;
}

.nav-prev,
.nav-next,
.nav-back,
.nav-back-only {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  transition:
    border-color var(--transition),
    box-shadow var(--transition),
    transform var(--transition);
  white-space: nowrap;
}

.nav-prev:hover,
.nav-next:hover,
.nav-back:hover,
.nav-back-only:hover {
  border-color: var(--level-color, #999);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.nav-back,
.nav-back-only {
  color: var(--color-muted);
}

/* Site footer (story pages) */
.site-footer {
  background: var(--color-navbar-bg);
  color: rgba(255, 255, 255, 0.5);
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  font-size: 0.85rem;
  margin-top: auto;
}

.site-footer span {
  opacity: 0.7;
}

/* ------------------------------------------------------------
   Landing Page — Level Sections
   ------------------------------------------------------------ */
.level-sections {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg) var(--space-3xl);
}

.level-section {
  padding: var(--space-2xl) 0;
  border-bottom: 1px solid var(--color-border);
  scroll-margin-top: 40px;
}

.level-section:last-child {
  border-bottom: none;
}

.level-section__head {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.level-section__info {
  flex: 1;
}

.level-section__title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.3;
}

.level-section__sub {
  font-size: 0.83rem;
  color: var(--color-muted);
  margin-top: 2px;
}

.level-section__link {
  font-size: 0.82rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  color: var(--color-muted);
  white-space: nowrap;
  flex-shrink: 0;
  transition:
    border-color var(--transition),
    color var(--transition);
}

.level-section__link:hover {
  color: var(--color-text);
  border-color: var(--level-color, #999);
}

.stories-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

/* Story image card */
.story-img-card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition:
    transform var(--transition),
    box-shadow var(--transition),
    border-color var(--transition);
  box-shadow: var(--shadow-sm);
}

.story-img-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--level-color, #ccc);
}

.story-img-card__image {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, #ebebea 0%, #d8d8d4 100%);
  overflow: hidden;
  position: relative;
  flex-shrink: 0;
}

.story-img-card__image::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.3) 0%,
    transparent 60%
  );
}

.story-img-card__image .img-placeholder-label {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(0, 0, 0, 0.28);
  pointer-events: none;
}

.story-img-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: relative;
  z-index: 1;
  display: block;
}

.story-img-card__body {
  padding: var(--space-md);
  display: grid;
  grid-template-areas:
    "num  read"
    "title title"
    "desc  desc";
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto 1fr;
  flex: 1;
}

.story-img-card__num {
  grid-area: num;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--level-color, #999);
  text-transform: uppercase;
  opacity: 0.85;
  align-self: center;
}

.story-img-card__title {
  grid-area: title;
  font-size: 0.97rem;
  font-weight: 700;
  line-height: 1.4;
  margin-top: 4px;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
}

.story-img-card__desc {
  grid-area: desc;
  font-size: 0.8rem;
  color: var(--color-muted);
  line-height: 1.65;
}

.story-img-card__read {
  grid-area: read;
  font-size: 0.77rem;
  font-weight: 600;
  color: var(--level-color, #999);
  align-self: center;
  transition: letter-spacing var(--transition);
}

.story-img-card:hover .story-img-card__read {
  letter-spacing: 0.02em;
}

/* Responsive — new elements */
@media (max-width: 900px) {
  .stories-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 580px) {
  .stories-grid {
    grid-template-columns: 1fr;
  }
  .level-section__head {
    flex-wrap: wrap;
  }
  .story-container {
    padding: var(--space-xl) var(--space-md);
  }
  .story-body {
    font-size: 1rem;
  }
  .story-navigation {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
  }
}

/* ------------------------------------------------------------
   Print
   ------------------------------------------------------------ */
@media print {
  .navbar,
  .footer,
  .story-nav,
  .back-link-wrap {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }

  .story-layout {
    max-width: 100%;
    padding: 0;
  }

  .story-content {
    font-size: 11pt;
    line-height: 2;
  }

  rt {
    color: #444;
  }
}