/* ============================================================
   fworks.studio — friendly education design system
   Inspired by Duolingo (single-CTA hero) + Khan (persona pivot)
   PC: min-width >= 768px
   SP: max-width <= 767px
   ============================================================ */

:root {
  /* ink */
  --ink:        #1f2933;
  --ink-2:      #3e4c59;
  --ink-muted:  #7b8794;
  --ink-faint:  #cbd2d9;

  /* surface */
  --bg:         #ffffff;
  --bg-soft:    #f5f7fa;
  --bg-card:    #ffffff;
  --line:       #e4e7eb;
  --line-soft:  #f0f3f6;

  /* primary CTA (Duolingo-ish trustworthy green) */
  --primary:        #58CC02;
  --primary-hover:  #4cb302;
  --primary-shadow: #46a302;

  /* subject palette */
  --c-math:    #3B82F6; /* 算数: blue */
  --c-kokugo:  #EF4444; /* 国語: red */
  --c-shakai:  #10B981; /* 社会: green */
  --c-rika:    #8B5CF6; /* 理科: purple */
  --c-eigo:    #F59E0B; /* 英語: amber */

  --shadow-sm:   0 1px 2px rgba(15,23,42,.06), 0 1px 3px rgba(15,23,42,.08);
  --shadow-md:   0 4px 12px rgba(15,23,42,.08), 0 2px 4px rgba(15,23,42,.05);
  --shadow-lg:   0 12px 24px rgba(15,23,42,.10), 0 6px 12px rgba(15,23,42,.06);
  --shadow-btn:  0 4px 0 var(--primary-shadow);

  /* spacing */
  --gap-1: 6px;
  --gap-2: 12px;
  --gap-3: 20px;
  --gap-4: 32px;
  --gap-5: 56px;
  --gap-6: 96px;

  /* typography */
  --sans:      "Hiragino Kaku Gothic ProN", "Yu Gothic", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", sans-serif;
  --rounded:   "Nunito", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  --serif:     "Shippori Mincho", "Hiragino Mincho ProN", "游明朝", "Yu Mincho", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

br.pc-only { display: none; }
@media (min-width: 768px) {
  br.pc-only { display: inline; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-feature-settings: "palt";
  line-height: 1.75;
  -webkit-text-size-adjust: 100%;
}

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

/* ───── links ───── */
a { color: inherit; text-decoration: none; }
a.tx-link {
  color: var(--primary);
  font-weight: 700;
  border-bottom: 2px solid currentColor;
  padding-bottom: 1px;
  transition: opacity .2s;
}
a.tx-link:hover { opacity: .7; }

/* ───── header ───── */
.site-header {
  background: rgba(255,255,255, .92);
  backdrop-filter: blur(10px) saturate(140%);
  -webkit-backdrop-filter: blur(10px) saturate(140%);
  border-bottom: 1px solid var(--line-soft);
  position: sticky; top: 0; z-index: 50;
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 0 auto;
  padding: 14px 28px;
  max-width: 1280px;
  gap: var(--gap-3);
}
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--rounded);
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: .02em;
  color: var(--ink);
  white-space: nowrap;
}
.site-brand img { width: 32px; height: 32px; }
.site-brand:hover { opacity: .75; }
.site-nav { display: flex; gap: 24px; align-items: center; }
.site-nav a {
  color: var(--ink-muted);
  font-size: .9rem;
  font-weight: 700;
  letter-spacing: .04em;
  position: relative;
  padding: 6px 4px;
  transition: color .15s;
}
.site-nav a:hover,
.site-nav a.is-active { color: var(--primary); }

/* ───── primary button (Duolingo-style) ───── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--primary);
  color: #fff !important;
  font-family: var(--sans);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: .04em;
  padding: 16px 36px;
  border-radius: 14px;
  border: 0;
  box-shadow: var(--shadow-btn);
  text-transform: uppercase;
  cursor: pointer;
  transition: transform .08s ease, background .15s ease, box-shadow .08s ease;
  min-width: 200px;
}
.btn-primary:hover  { background: var(--primary-hover); }
.btn-primary:active { transform: translateY(2px); box-shadow: 0 2px 0 var(--primary-shadow); }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--ink-2);
  font-weight: 700;
  font-size: .95rem;
  padding: 12px 24px;
  border-radius: 12px;
  border: 2px solid var(--line);
  background: #fff;
  transition: border-color .15s, color .15s;
}
.btn-secondary:hover { border-color: var(--primary); color: var(--primary); }

/* ───── footer ───── */
.site-footer {
  margin-top: var(--gap-6);
  padding: 40px 28px 32px;
  border-top: 1px solid var(--line-soft);
  color: var(--ink-faint);
  font-size: .82rem;
  text-align: center;
  letter-spacing: .04em;
  background: var(--bg-soft);
}
.site-footer a { color: var(--ink-muted); margin: 0 8px; }
.site-footer a:hover { color: var(--primary); }
.site-footer p { margin: 4px 0; }

/* ───── wrap ───── */
.wrap {
  margin: 0 auto;
  padding: 32px 24px 0;
}
.wrap--narrow { max-width: 720px; }
.wrap--mid    { max-width: 960px; }
.wrap--wide   { max-width: 1200px; }

/* ============================================================
   HERO — duolingo-style: character (L) + copy+CTA (R)
   ============================================================ */
.hero {
  display: grid;
  gap: 24px;
  align-items: center;
  margin: 16px 0 40px;
}
.hero__visual {
  display: flex;
  justify-content: center;
}
.hero__visual img {
  max-width: 280px;
  width: 100%;
  filter: drop-shadow(0 12px 28px rgba(59,130,246,.18));
  animation: float 6s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-12px); }
}
.hero__title {
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(1.7rem, 5vw, 2.4rem);
  line-height: 1.4;
  letter-spacing: .02em;
  margin: 0 0 12px;
  color: var(--ink);
}
.hero__sub {
  color: var(--ink-2);
  font-size: 1.0rem;
  line-height: 1.85;
  margin: 0 0 24px;
}
.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

/* ============================================================
   STATS BAND — full-bleed metrics
   ============================================================ */
.stats-band {
  margin: 0 calc(50% - 50vw);
  width: 100vw;
  padding: 28px 24px;
  background: linear-gradient(135deg, #EFF6FF 0%, #F5F3FF 100%);
  border-top: 1px solid #DBEAFE;
  border-bottom: 1px solid #DDD6FE;
}
.stats-band__inner {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  text-align: center;
}
.stat {
  padding: 12px 8px;
}
.stat__num {
  font-family: var(--rounded);
  font-weight: 900;
  font-size: 2.2rem;
  line-height: 1.1;
  color: var(--c-rika);
  letter-spacing: -.01em;
  display: block;
}
.stat__num small {
  font-size: 1.0rem;
  margin-left: 2px;
  color: var(--c-rika);
  opacity: .8;
}
.stat__label {
  display: block;
  margin-top: 4px;
  font-size: .85rem;
  color: var(--ink-2);
  font-weight: 700;
  letter-spacing: .04em;
}
.stat:nth-child(2) .stat__num,
.stat:nth-child(2) .stat__num small { color: var(--c-math); }
.stat:nth-child(3) .stat__num,
.stat:nth-child(3) .stat__num small { color: var(--c-shakai); }

/* ============================================================
   REEL STRIP — 3 vertical reels
   ============================================================ */
.reel-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.reel-card {
  position: relative;
  display: block;
  aspect-ratio: 9 / 16;
  border-radius: 18px;
  overflow: hidden;
  background: #000;
  box-shadow: var(--shadow-md);
  transition: transform .18s ease, box-shadow .18s ease;
}
.reel-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.reel-card img,
.reel-card video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.reel-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,.55) 0%, rgba(0,0,0,0) 50%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 16px 16px 18px;
  color: #fff;
  z-index: 2;
}
.reel-card__tag {
  display: inline-block;
  width: fit-content;
  padding: 2px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,.95);
  color: var(--c-rika);
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .1em;
  margin-bottom: 6px;
}
.reel-card__title {
  font-size: .95rem;
  font-weight: 800;
  line-height: 1.4;
  margin: 0;
  text-shadow: 0 1px 4px rgba(0,0,0,.3);
}
.reel-card__play {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 56px; height: 56px;
  border-radius: 50%;
  background: rgba(255,255,255,.92);
  display: flex; align-items: center; justify-content: center;
  z-index: 2;
  transition: transform .15s ease, background .15s ease;
}
.reel-card__play::before {
  content: "";
  border-style: solid;
  border-width: 9px 0 9px 14px;
  border-color: transparent transparent transparent var(--c-rika);
  margin-left: 4px;
}
.reel-card:hover .reel-card__play {
  background: #fff;
  transform: translate(-50%, -50%) scale(1.08);
}

/* ============================================================
   SPOTLIGHT — featured reel (video + copy)
   ============================================================ */
.spotlight {
  display: grid;
  gap: 24px;
  background: linear-gradient(135deg, #FEF3C7 0%, #FFFBEB 100%);
  border: 1px solid #FDE68A;
  border-radius: 24px;
  padding: 28px 24px;
  align-items: center;
}
.spotlight__badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 999px;
  background: #fff;
  color: var(--c-eigo);
  font-weight: 800;
  font-size: .78rem;
  letter-spacing: .08em;
  margin-bottom: 12px;
}
.spotlight__title {
  font-size: 1.5rem;
  font-weight: 800;
  margin: 0 0 10px;
  color: var(--ink);
  letter-spacing: .02em;
  line-height: 1.4;
}
.spotlight__body {
  color: var(--ink-2);
  font-size: .98rem;
  line-height: 1.85;
  margin: 0 0 16px;
}
.spotlight__video {
  aspect-ratio: 9 / 16;
  max-width: 280px;
  width: 100%;
  margin: 0 auto;
  border-radius: 18px;
  overflow: hidden;
  background: #000;
  box-shadow: var(--shadow-lg);
}
.spotlight__video video {
  width: 100%; height: 100%; object-fit: cover; display: block;
}

/* ============================================================
   SECTION TITLE — friendly bold (not editorial)
   ============================================================ */
.section-title {
  margin: 56px 0 24px;
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.section-title h2 {
  font-family: var(--sans);
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: .04em;
  color: var(--ink);
  margin: 0;
}
.section-title .section-sub {
  color: var(--ink-muted);
  font-size: .92rem;
  font-weight: 500;
}

/* ============================================================
   SUBJECT TILES — persona pivot
   ============================================================ */
.subject-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.subject-tile {
  display: block;
  position: relative;
  padding: 24px 22px 22px;
  border-radius: 18px;
  background: var(--tile-bg, var(--bg-soft));
  color: var(--tile-fg, var(--ink));
  border: 2px solid var(--tile-bg, var(--bg-soft));
  overflow: hidden;
  transition: transform .18s ease, box-shadow .18s ease;
}
.subject-tile:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.subject-tile__icon {
  font-size: 2.2rem;
  margin-bottom: 8px;
  line-height: 1;
}
.subject-tile__icon img,
.subject-icon-img {
  width: 72px;
  height: 72px;
  display: block;
  filter: drop-shadow(0 4px 8px rgba(31,41,51,.10));
}
.subject-section__head .subject-icon-img {
  width: 40px;
  height: 40px;
  filter: drop-shadow(0 2px 4px rgba(31,41,51,.10));
}
.subject-tile__name {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: .04em;
  margin: 0 0 4px;
}
.subject-tile__meta {
  font-size: .82rem;
  color: var(--tile-meta, var(--ink-muted));
  opacity: .9;
  letter-spacing: .03em;
}

/* per-subject color */
.subject-tile[data-subject="math"]   { --tile-bg: #EFF6FF; --tile-fg: var(--c-math);   border-color: #DBEAFE; }
.subject-tile[data-subject="kokugo"] { --tile-bg: #FEF2F2; --tile-fg: var(--c-kokugo); border-color: #FECACA; }
.subject-tile[data-subject="shakai"] { --tile-bg: #ECFDF5; --tile-fg: var(--c-shakai); border-color: #BBF7D0; }
.subject-tile[data-subject="rika"]   { --tile-bg: #F5F3FF; --tile-fg: var(--c-rika);   border-color: #DDD6FE; }
.subject-tile[data-subject="eigo"]   { --tile-bg: #FFFBEB; --tile-fg: var(--c-eigo);   border-color: #FDE68A; }
.subject-tile[data-subject="math"]:hover   { border-color: var(--c-math); }
.subject-tile[data-subject="kokugo"]:hover { border-color: var(--c-kokugo); }
.subject-tile[data-subject="shakai"]:hover { border-color: var(--c-shakai); }
.subject-tile[data-subject="rika"]:hover   { border-color: var(--c-rika); }
.subject-tile[data-subject="eigo"]:hover   { border-color: var(--c-eigo); }

/* grade row inside subject section */
.grade-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-top: 12px;
}
.grade-tile {
  display: block;
  padding: 14px 16px;
  background: #fff;
  border: 2px solid var(--line);
  border-radius: 12px;
  color: var(--ink);
  font-weight: 700;
  font-size: .95rem;
  transition: border-color .15s, transform .12s;
}
.grade-tile:hover {
  border-color: var(--tile-fg, var(--primary));
  transform: translateY(-2px);
}
.grade-tile small {
  display: block;
  margin-top: 2px;
  font-size: .73rem;
  color: var(--ink-muted);
  font-weight: 500;
}

/* subject section block (with colored heading bar) */
.subject-section {
  margin: 48px 0;
}
.subject-section__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border-radius: 14px;
  background: var(--sec-bg, var(--bg-soft));
  margin-bottom: 16px;
}
.subject-section__head h2 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--sec-fg, var(--ink));
  letter-spacing: .04em;
}
.subject-section[data-subject="math"]   { --sec-bg: #EFF6FF; --sec-fg: var(--c-math); }
.subject-section[data-subject="kokugo"] { --sec-bg: #FEF2F2; --sec-fg: var(--c-kokugo); }
.subject-section[data-subject="shakai"] { --sec-bg: #ECFDF5; --sec-fg: var(--c-shakai); }
.subject-section[data-subject="rika"]   { --sec-bg: #F5F3FF; --sec-fg: var(--c-rika); }
.subject-section[data-subject="eigo"]   { --sec-bg: #FFFBEB; --sec-fg: var(--c-eigo); }

/* ============================================================
   LEARN content (rika5 unit pages) — keep editorial feel
   ============================================================ */
.page-title {
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  letter-spacing: .03em;
  line-height: 1.4;
  margin: 16px 0 12px;
  color: var(--ink);
}
.page-subtitle {
  color: var(--ink-muted);
  font-size: 1.0rem;
  margin: 0 0 var(--gap-4);
  line-height: 1.85;
  max-width: 36em;
}

/* unit list (rika5 index) */
.unit-list {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}
.unit-list .card {
  display: block;
  padding: 20px 22px;
  background: #fff;
  border: 2px solid var(--line);
  border-radius: 14px;
  color: var(--ink);
  transition: border-color .15s, transform .12s, box-shadow .15s;
}
.unit-list .card:hover {
  border-color: var(--c-rika);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}
.unit-list .unit-id {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  background: #F5F3FF;
  color: var(--c-rika);
  font-weight: 800;
  font-size: .78rem;
  letter-spacing: .08em;
  margin-bottom: 8px;
}
.unit-list .card h3 {
  font-size: 1.1rem;
  line-height: 1.55;
  margin: 0 0 4px;
  font-weight: 800;
}
.unit-list .card p {
  font-size: .9rem;
  color: var(--ink-muted);
  line-height: 1.75;
  margin: 0;
}

/* unit hero — textbook style */
.unit-hero {
  display: grid;
  gap: 18px;
  margin: 12px 0 32px;
  padding-bottom: 24px;
  border-bottom: 2px solid #1a1a1a;
}
.unit-hero__meta {
  display: block;
  font-family: var(--serif);
  font-size: .85rem;
  font-weight: 600;
  color: #777;
  letter-spacing: .18em;
  margin: 0 0 6px;
  background: none;
  padding: 0;
  border-radius: 0;
}
.unit-hero__meta .domain {
  margin-left: 14px;
  color: #777;
  opacity: 1;
  font-weight: 400;
}
.unit-hero h1 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  letter-spacing: .05em;
  line-height: 1.35;
  margin: 0 0 8px;
  color: #1a1a1a;
}
.unit-hero p.lead {
  font-family: var(--serif);
  font-size: 1.0rem;
  line-height: 1.9;
  color: #333;
  margin: 0;
  max-width: 32em;
}
.unit-hero__visual img {
  border: 1px solid #e0e0e0;
  border-radius: 2px;
  box-shadow: none;
}

/* ============================================================
   TEXTBOOK WRAP — scope monochrome textbook style
   ============================================================ */
.wrap--textbook { max-width: 880px; }

/* 重要語のマーキング — 教科書の赤字 */
.wrap--textbook .kw {
  color: #b91c1c;
  font-weight: 700;
  font-style: normal;
  background: none;
}
.wrap--textbook .lesson__keywords span {
  color: #b91c1c;
  font-weight: 700;
}
.wrap--textbook .lesson__summary-label {
  color: #b91c1c;
}
.wrap--textbook .section-title {
  margin: 72px 0 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid #1a1a1a;
  display: block;
}
.wrap--textbook .section-title h2 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.3rem;
  letter-spacing: .08em;
  color: #1a1a1a;
}
.wrap--textbook .section-title .section-sub { display: none; }
.wrap--textbook .lesson__main { grid-template-columns: 1fr; }
.wrap--textbook .lesson__image { float: right; max-width: 240px; margin: 4px 0 12px 24px; }
.wrap--textbook .lesson__image img { max-width: 240px; }

@media (max-width: 767px) {
  .wrap--textbook .lesson__image { float: none; margin: 0 auto 14px; max-width: 220px; }
}

/* ============================================================
   LESSON — textbook style (no decoration / monochrome)
   ============================================================ */
.lesson {
  margin: 64px 0;
  padding-bottom: 40px;
  border-bottom: 1px solid #e6e6e6;
}
.lesson:last-of-type { border-bottom: 0; }

.lesson__header {
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 2px solid #1a1a1a;
}
.lesson__no {
  display: block;
  font-family: var(--serif), serif;
  font-size: .82rem;
  font-weight: 600;
  color: #777;
  letter-spacing: .2em;
  margin-bottom: 6px;
}
.lesson-tag {
  display: none; /* drop decorative tags in textbook view */
}
.lesson__title {
  font-family: var(--serif);
  font-size: clamp(1.4rem, 2.4vw, 1.75rem);
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1.5;
  margin: 0;
  color: #1a1a1a;
}

/* Hook 廃止 — 最初の段落として扱う */
.lesson__hook {
  margin: 0 0 14px;
  font-size: 1.0rem;
  line-height: 1.95;
  color: #2a2a2a;
  font-weight: 600;
  background: none;
  border: 0;
  padding: 0;
  border-radius: 0;
  font-family: var(--serif);
}

/* Keywords inline format: 重要語：A｜B｜C */
.lesson__keywords {
  display: block;
  margin: 0 0 22px;
  font-size: .9rem;
  color: #555;
  font-family: var(--serif);
}
.lesson__keywords::before {
  content: "重要語  ";
  font-weight: 700;
  color: #1a1a1a;
  margin-right: 4px;
}
.lesson__keywords span {
  display: inline;
  background: none;
  border-radius: 0;
  padding: 0;
  color: #333;
  font-weight: 500;
  font-size: .9rem;
}
.lesson__keywords span + span::before {
  content: " ｜ ";
  color: #bbb;
  margin: 0 2px;
}

/* Body layout: SP = 1col, PC = text + small inline image */
.lesson__main {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

/* Image — small, restrained, no shadow */
.lesson__image { margin: 0; }
.lesson__image img {
  width: 100%;
  max-width: 280px;
  display: block;
  margin: 0 auto;
  border: 1px solid #e0e0e0;
  border-radius: 2px;
  box-shadow: none;
}
.lesson__image figcaption {
  font-family: var(--serif);
  font-size: .82rem;
  color: #666;
  text-align: center;
  margin-top: 6px;
  letter-spacing: .04em;
}

/* Q&A as typographic prose — 問．／答． */
.qa {
  margin: 0 0 16px;
  padding: 0;
  background: none;
  border: 0;
  font-family: var(--serif);
}
.qa__q {
  margin: 0 0 4px;
  font-weight: 600;
  color: #1a1a1a;
  font-size: 1.0rem;
  line-height: 1.85;
  padding-left: 2.4em;
  text-indent: -2.4em;
}
.qa__q::before {
  content: "問．";
  font-weight: 700;
  color: #1a1a1a;
}
.qa__a {
  margin: 0;
  color: #333;
  font-size: 1.0rem;
  line-height: 1.85;
  padding-left: 2.4em;
  text-indent: -2.4em;
}
.qa__a::before {
  content: "答．";
  font-weight: 700;
  color: #555;
}

/* Narrative paragraph */
.lesson__narrative {
  margin: 0 0 14px;
  color: #2a2a2a;
  font-size: 1.0rem;
  line-height: 1.95;
  font-family: var(--serif);
}

/* Summary — top rule + label, no bg */
.lesson__summary {
  margin: 28px 0 0;
  padding: 14px 0 0;
  background: none;
  border: 0;
  border-top: 1px solid #1a1a1a;
}
.lesson__summary-label {
  display: block;
  font-family: var(--serif);
  font-size: .88rem;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 6px;
  letter-spacing: .08em;
  background: none;
  padding: 0;
  border-radius: 0;
}
.lesson__summary p {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  color: #2a2a2a;
  font-size: 1.0rem;
  line-height: 1.85;
}


/* ============================================================
   COLUMN ARTICLE — long-form readable
   ============================================================ */
.article {
  margin: 24px 0 56px;
}
.article__meta {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 999px;
  background: #F5F3FF;
  color: var(--c-rika);
  font-weight: 800;
  font-size: .78rem;
  letter-spacing: .08em;
  margin-bottom: 14px;
}
.article h1 {
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  letter-spacing: .03em;
  line-height: 1.4;
  margin: 0 0 8px;
}
.article__lead {
  font-size: 1.1rem;
  line-height: 1.85;
  color: var(--ink-muted);
  margin: 0 0 32px;
}
.article__body {
  font-size: 1.0rem;
  line-height: 2.0;
  color: var(--ink-2);
}
.article__body h2 {
  font-size: 1.3rem;
  font-weight: 800;
  margin: 40px 0 14px;
  color: var(--ink);
  letter-spacing: .02em;
  padding-left: 14px;
  border-left: 4px solid var(--c-rika);
}
.article__body p { margin: 0 0 18px; }
.article__body blockquote {
  margin: 24px 0;
  padding: 18px 24px;
  background: #F5F3FF;
  border-left: 4px solid var(--c-rika);
  border-radius: 0 12px 12px 0;
  font-size: 1.0rem;
  color: var(--ink);
  font-weight: 600;
}
.article__body ul {
  margin: 0 0 18px;
  padding-left: 22px;
}
.article__body ul li { margin-bottom: 6px; }
.article__body strong { color: var(--ink); font-weight: 800; }

/* coming-soon */
.coming-soon {
  margin: var(--gap-5) auto;
  padding: 56px 24px;
  text-align: center;
  border: 2px dashed var(--line);
  border-radius: 18px;
  background: var(--bg-soft);
}
.coming-soon h2 {
  margin: 0 0 8px;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--ink);
}
.coming-soon p {
  color: var(--ink-muted);
  font-weight: 700;
  letter-spacing: .12em;
  margin: 0;
}

/* =============================================================
   PC: min-width >= 768px
   ============================================================= */
@media (min-width: 768px) {
  .wrap { padding: 56px 40px 0; }

  /* stats band */
  .stats-band { padding: 36px 24px; }
  .stat__num { font-size: 3.0rem; }
  .stat__num small { font-size: 1.2rem; }
  .stat__label { font-size: .95rem; margin-top: 8px; }

  /* reel strip */
  .reel-strip { grid-template-columns: repeat(3, 1fr); gap: 20px; }

  /* spotlight 2-col */
  .spotlight {
    grid-template-columns: 1fr 1.4fr;
    gap: 40px;
    padding: 40px 40px;
  }
  .spotlight__video { max-width: 320px; }
  .spotlight__title { font-size: 1.8rem; }

  /* article */
  .article__body { font-size: 1.05rem; }
  .article__body h2 { font-size: 1.5rem; margin-top: 56px; }

  /* HERO 2-col */
  .hero {
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    margin: 40px 0 60px;
    min-height: 420px;
  }
  .hero__visual { order: 1; }
  .hero__visual img { max-width: 380px; }
  .hero__body { order: 2; }
  .hero__title { font-size: clamp(2.2rem, 3.6vw, 2.8rem); }
  .hero__sub { font-size: 1.1rem; }

  .section-title { margin: 80px 0 28px; }
  .section-title h2 { font-size: 1.6rem; }

  /* subject grid: 5 columns */
  .subject-grid {
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
  }
  .subject-tile { padding: 28px 22px 24px; }
  .subject-tile__icon { font-size: 2.6rem; }
  .subject-tile__name { font-size: 1.2rem; }

  /* grade row: 6 columns */
  .grade-row {
    grid-template-columns: repeat(6, 1fr);
    gap: 12px;
  }
  .grade-tile { padding: 16px 18px; font-size: 1.0rem; }

  /* unit list */
  .unit-list { grid-template-columns: repeat(3, 1fr); gap: 18px; }
  .unit-list .card { padding: 24px 22px; }

  /* unit hero */
  .unit-hero {
    grid-template-columns: 1.2fr .8fr;
    gap: 56px;
    align-items: center;
    margin: 40px 0 72px;
    padding-bottom: 48px;
  }
  .unit-hero__visual { order: 2; }

  .lesson { margin: 80px 0; padding-bottom: 64px; }
  .lesson__title { font-size: 1.7rem; }
  .lesson__hook { font-size: 1.08rem; padding: 16px 22px; }
  .lesson__main { grid-template-columns: 1fr 280px; gap: 36px; align-items: start; }
  .lesson__image { position: sticky; top: 88px; }
  .lesson__image img { max-width: none; }
  .qa { padding: 18px 22px; }
  .qa__q, .qa__a { font-size: 1.0rem; }
  .lesson__summary p { font-size: 1.05rem; }
}

/* =============================================================
   SP: max-width <= 767px
   ============================================================= */
@media (max-width: 767px) {
  .site-header__inner { padding: 12px 16px; gap: 8px; }
  .site-brand { font-size: 1.0rem; }
  .site-nav { gap: 14px; }
  .site-nav a { font-size: .82rem; }

  .wrap { padding: 20px 16px 0; }

  /* stats band SP */
  .stats-band { padding: 20px 16px; }
  .stats-band__inner { gap: 4px; }
  .stat { padding: 8px 4px; }
  .stat__num { font-size: 1.6rem; }
  .stat__num small { font-size: .8rem; }
  .stat__label { font-size: .72rem; letter-spacing: .02em; }

  /* reel strip SP — horizontal scroll */
  .reel-strip {
    grid-template-columns: repeat(3, 78%);
    gap: 12px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    padding: 0 8px 8px;
    margin: 0 -16px;
  }
  .reel-card { scroll-snap-align: start; }

  /* spotlight SP — stacked */
  .spotlight { padding: 20px 18px; gap: 16px; border-radius: 18px; }
  .spotlight__title { font-size: 1.25rem; }
  .spotlight__body { font-size: .92rem; }
  .spotlight__video { max-width: 240px; }

  /* article SP */
  .article__lead { font-size: 1.0rem; }
  .article__body h2 { font-size: 1.15rem; margin-top: 32px; }

  .hero { text-align: center; }
  .hero__visual img { max-width: 220px; }
  .hero__title { font-size: 1.55rem; line-height: 1.4; }
  .hero__sub { font-size: .92rem; }
  .hero__cta { justify-content: center; }
  .btn-primary { width: 100%; padding: 14px 24px; }

  .subject-tile { padding: 18px 16px 16px; border-radius: 14px; }
  .subject-tile__icon { font-size: 1.8rem; }
  .subject-tile__name { font-size: 1.0rem; }
  .subject-tile__meta { font-size: .76rem; }

  .grade-row { grid-template-columns: repeat(3, 1fr); gap: 8px; }
  .grade-tile { padding: 12px 8px; font-size: .85rem; text-align: center; }
  .grade-tile small { font-size: .68rem; }

  .subject-section__head { padding: 12px 14px; border-radius: 12px; }
  .subject-section__head h2 { font-size: 1.05rem; }

  .page-title { font-size: 1.6rem; }
  .page-subtitle { font-size: .9rem; }

  .unit-list { gap: 10px; }
  .unit-list .card { padding: 16px 16px; border-radius: 12px; }
  .unit-list .card h3 { font-size: 1.0rem; }

  .unit-hero { margin: 12px 0 32px; padding-bottom: 24px; gap: 18px; }
  .unit-hero h1 { font-size: 1.5rem; }
  .unit-hero p.lead { font-size: .92rem; }

  .lesson { margin: 40px 0; padding-bottom: 32px; }
  .lesson__title { font-size: 1.2rem; }
  .lesson__hook { font-size: .95rem; padding: 12px 14px; }
  .lesson__image { order: -1; }
  .lesson__image img { max-width: 240px; }
  .qa { padding: 12px 14px; }
  .qa__q { font-size: .95rem; padding-left: 30px; }
  .qa__a { font-size: .9rem; padding-left: 30px; }
  .lesson__narrative { font-size: .92rem; }
  .lesson__summary { padding: 14px 16px; }
  .lesson__summary p { font-size: .94rem; }

  .coming-soon { padding: 40px 20px; margin: 40px 0; border-radius: 14px; }
  .coming-soon h2 { font-size: 1.2rem; }
}
/* ============================================================
   COLUMN INDEX — magazine-like article cards
   ============================================================ */
.column-index__head {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 2px solid var(--ink);
}
.column-list {
  display: grid;
  gap: 24px;
}
.column-card {
  display: block;
  padding: 28px 0 32px;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  transition: opacity .2s;
}
.column-card:hover { opacity: .65; }
.column-card:last-child { border-bottom: 0; }
.column-card__meta {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 10px;
  font-size: .78rem;
  letter-spacing: .12em;
  color: var(--ink-muted);
  font-weight: 700;
}
.column-card__tag {
  color: var(--c-rika);
  background: #F5F3FF;
  padding: 3px 12px;
  border-radius: 999px;
}
.column-card__date {
  font-family: var(--serif-en, "Cormorant Garamond", serif);
  font-style: italic;
  letter-spacing: .14em;
  font-size: .85rem;
  color: var(--ink-faint);
}
.column-card__title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.6rem;
  letter-spacing: .03em;
  line-height: 1.4;
  margin: 0 0 8px;
}
.column-card__sub {
  margin: 0 0 12px;
  font-size: 1.0rem;
  color: var(--ink-2);
  line-height: 1.75;
}
.column-card__lead {
  margin: 0 0 14px;
  color: var(--ink-muted);
  font-size: .95rem;
  line-height: 1.85;
}
.column-card__more {
  display: inline-block;
  font-size: .85rem;
  font-weight: 700;
  color: var(--c-rika);
  letter-spacing: .04em;
}

@media (min-width: 768px) {
  .column-card { padding: 36px 0 44px; }
  .column-card__title { font-size: 2.0rem; }
}

/* ============================================================
   COLUMN ARTICLE — long-form readable / editorial
   ============================================================ */
.article--essay {
  margin: 24px 0 56px;
}
.article__meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-size: .78rem;
  color: var(--ink-muted);
  letter-spacing: .14em;
  font-weight: 700;
  margin-bottom: 18px;
  text-transform: uppercase;
}
.article__meta-sep { color: var(--ink-faint); }
.article__title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(2.0rem, 5vw, 3.2rem);
  letter-spacing: .04em;
  line-height: 1.35;
  margin: 0 0 14px;
  color: var(--ink);
}
.article__subtitle {
  font-family: var(--serif);
  font-size: 1.15rem;
  color: var(--ink-2);
  margin: 0 0 28px;
  line-height: 1.75;
  font-weight: 500;
  letter-spacing: .02em;
}
.article__rule {
  border: 0;
  border-top: 1px solid var(--ink);
  width: 80px;
  margin: 32px 0 28px;
}
.article__lead--dropcap {
  font-size: 1.2rem !important;
  color: var(--ink) !important;
  line-height: 1.95 !important;
  margin: 0 0 36px !important;
}
.article__lead--dropcap::first-letter {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 4.2em;
  float: left;
  line-height: .9;
  margin: .08em .12em -.05em 0;
  color: var(--c-rika);
}

/* pull quote — large italic featured statement */
.article__pullquote {
  position: relative;
  margin: 40px -8px;
  padding: 28px 28px 28px 56px;
  font-family: var(--serif);
  font-size: 1.4rem;
  font-weight: 600;
  line-height: 1.7;
  color: var(--ink);
  background: linear-gradient(to right, #F5F3FF 0%, transparent 100%);
  border-left: 4px solid var(--c-rika);
  border-radius: 0 12px 12px 0;
}
.article__pullquote-mark {
  position: absolute;
  left: 18px; top: 4px;
  font-family: "Cormorant Garamond", serif;
  font-size: 4rem;
  color: var(--c-rika);
  opacity: .5;
  line-height: 1;
}

/* two-line statement (parallel structure) */
.article__twoline {
  margin: 32px 0;
  padding: 24px 28px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink);
}
.article__twoline span { display: block; }

.article__footer {
  margin-top: 48px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}
.article__back {
  font-size: .92rem;
  font-weight: 700;
  color: var(--c-rika);
  letter-spacing: .04em;
}

@media (min-width: 768px) {
  .article__pullquote { font-size: 1.65rem; margin: 56px -16px; padding: 36px 36px 36px 72px; }
  .article__twoline { font-size: 1.4rem; }
  .article__lead--dropcap { font-size: 1.3rem !important; }
}