/* ============================================================
   SUICS SCHOOL — suics.jp 本体とデザイントークンを共通化
   （cream × ink × antique gold ／ Noto Serif JP 見出し）
   ============================================================ */
:root {
  --cream:      #F7F3ED;
  --cream-dark: #EDE8E0;
  --ink:        #1a1a1a;
  --ink-mid:    #555;
  --ink-light:  #999;
  --rule:       rgba(26,26,26,0.12);
  --gold:       #C9A84C;
  --gold-light: #E8CC7E;
  --ok:         #4A7A4C;
  --serif: 'Noto Serif JP', serif;
  --sans:  'Noto Sans JP', sans-serif;
  --latin: 'Cormorant Garamond', serif;
  --label: 'Inter', sans-serif;
  --sidebar-w: 340px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--sans);
  font-weight: 400;
  color: var(--ink);
  background: var(--cream);
  line-height: 1.8;
}
button { font-family: inherit; cursor: pointer; }

/* ===== Layout ===== */
.app { display: flex; min-height: 100vh; }

/* ===== Sidebar ===== */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--cream-dark);
  border-right: 1px solid var(--rule);
  color: var(--ink);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--ink-light) transparent;
}
.sidebar-head {
  padding: 26px 24px 20px;
  border-bottom: 1px solid var(--rule);
}
.school-logo {
  text-decoration: none;
  font-family: var(--label);
  font-weight: 400;
  letter-spacing: .28em;
  font-size: 11px;
  color: var(--ink);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 9px;
}
.school-logo::before {
  content: "";
  width: 8px; height: 8px;
  background: var(--gold);
  display: inline-block;
  transform: rotate(45deg);
}
.members-chip {
  font-family: var(--label);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: .18em;
  color: var(--cream);
  background: var(--ink);
  border-radius: 2px;
  padding: 1px 7px;
}
.course-title {
  margin-top: 14px;
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: .02em;
}
.course-subtitle {
  margin-top: 5px;
  font-size: 11.5px;
  font-weight: 300;
  color: var(--ink-mid);
  letter-spacing: .04em;
}
/* progress */
.progress-wrap { margin-top: 18px; }
.progress-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--label);
  font-size: 10px;
  letter-spacing: .12em;
  color: var(--ink-mid);
  margin-bottom: 7px;
}
.progress-pct {
  font-family: var(--latin);
  font-size: 24px;
  font-weight: 400;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.progress-bar {
  height: 3px;
  background: var(--rule);
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--gold);
  transition: width .5s cubic-bezier(.22,1,.36,1);
}

/* sections & lessons */
.nav { padding: 8px 0 30px; flex: 1; }
.section-label {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 24px 8px;
  font-family: var(--label);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: .24em;
  color: var(--ink-light);
  text-transform: uppercase;
}
.section-label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--rule);
}
.section-badge {
  font-size: 10px;
  font-weight: 500;
  font-family: var(--sans);
  padding: 0 8px;
  border: 1px solid var(--gold);
  color: var(--gold);
  letter-spacing: .08em;
}
.lesson-item {
  width: 100%;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  text-align: left;
  padding: 12px 24px;
  background: transparent;
  border: none;
  border-left: 2px solid transparent;
  color: var(--ink-mid);
  transition: background .15s, color .15s;
}
.lesson-item:hover { background: rgba(26,26,26,.04); color: var(--ink); }
.lesson-item.active {
  background: var(--cream);
  border-left-color: var(--gold);
  color: var(--ink);
}
.check {
  flex-shrink: 0;
  width: 20px; height: 20px;
  margin-top: 3px;
  border-radius: 50%;
  border: 1px solid var(--ink-light);
  display: grid;
  place-items: center;
  font-size: 11px;
  color: transparent;
  transition: all .2s;
}
.lesson-item.done .check {
  background: var(--gold);
  border-color: var(--gold);
  color: #fff;
  font-weight: 700;
}
.lesson-item.locked .check {
  border-style: dashed;
}
.lesson-item .li-body { min-width: 0; }
.li-title { font-size: 13px; font-weight: 400; line-height: 1.55; }
.lesson-item.active .li-title { font-weight: 500; }
.li-meta {
  display: flex;
  gap: 8px;
  align-items: center;
  font-family: var(--label);
  font-size: 10px;
  letter-spacing: .06em;
  color: var(--ink-light);
  margin-top: 3px;
}
.free-tag {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 500;
  color: #fff;
  background: var(--gold);
  padding: 0 7px;
  letter-spacing: .08em;
}
.paid-tag {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 400;
  color: var(--ink-mid);
  border: 1px solid var(--rule);
  padding: 0 7px;
  letter-spacing: .06em;
}

/* sidebar footer (suics.jp link) */
.sidebar-foot {
  padding: 16px 24px 24px;
  border-top: 1px solid var(--rule);
  font-size: 11px;
  font-weight: 300;
  color: var(--ink-mid);
  letter-spacing: .04em;
}
.sidebar-foot a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 400;
  margin-top: 6px;
  margin-right: 14px;
}
.sidebar-foot a:hover { color: var(--gold); }
.sidebar-foot a::before { content: "→"; color: var(--gold); }

/* ===== Main ===== */
.main { flex: 1; min-width: 0; }
.topbar {
  background: var(--cream);
  border-bottom: 1px solid var(--rule);
  padding: 15px 32px;
  display: flex;
  align-items: center;
  gap: 14px;
  position: sticky;
  top: 0;
  z-index: 20;
}
.menu-btn {
  display: none;
  background: var(--ink);
  color: var(--cream);
  border: none;
  border-radius: 2px;
  width: 40px; height: 40px;
  font-size: 17px;
  flex-shrink: 0;
}
.breadcrumb {
  font-size: 12px;
  font-weight: 300;
  color: var(--ink-light);
  letter-spacing: .04em;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.breadcrumb strong { color: var(--ink); font-weight: 500; }

.content {
  max-width: 900px;
  margin: 0 auto;
  padding: 36px 32px 90px;
}

/* video */
.video-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--ink);
  border: 1px solid var(--rule);
  box-shadow: 0 24px 60px -30px rgba(26,26,26,.5);
}
.video-frame iframe {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  border: 0;
}
.video-placeholder {
  position: absolute; inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  color: var(--cream);
}
.video-placeholder::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 82% 18%, rgba(201,168,76,.16), transparent 45%),
    radial-gradient(circle at 12% 88%, rgba(201,168,76,.08), transparent 40%);
}
.play-circle {
  width: 76px; height: 76px;
  border-radius: 50%;
  border: 1px solid rgba(247,243,237,.45);
  display: grid;
  place-items: center;
  position: relative;
}
.play-circle::after {
  content: "";
  width: 0; height: 0;
  border-left: 18px solid var(--gold);
  border-top: 11px solid transparent;
  border-bottom: 11px solid transparent;
  margin-left: 5px;
}
.vp-text {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 15px;
  letter-spacing: .1em;
  position: relative;
}
.vp-sub {
  font-size: 11.5px;
  font-weight: 300;
  letter-spacing: .08em;
  color: rgba(247,243,237,.65);
  position: relative;
}

/* lock panel (paid lessons on public site) */
.lock-icon {
  width: 76px; height: 76px;
  border-radius: 50%;
  border: 1px solid var(--gold);
  display: grid;
  place-items: center;
  font-size: 26px;
  position: relative;
}
.lock-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  position: relative;
  margin-top: 8px;
}
.btn-gold, .btn-ghost {
  display: inline-block;
  text-decoration: none;
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: .12em;
  padding: 11px 26px;
  transition: all .2s;
}
.btn-gold {
  background: var(--gold);
  color: #fff;
}
.btn-gold:hover { background: var(--gold-light); color: var(--ink); }
.btn-ghost {
  border: 1px solid rgba(247,243,237,.5);
  color: var(--cream);
}
.btn-ghost:hover { border-color: var(--gold); color: var(--gold-light); }

/* lesson header */
.lesson-head { margin-top: 32px; }
.lesson-head h1 {
  font-family: var(--serif);
  font-size: 27px;
  font-weight: 600;
  line-height: 1.6;
  letter-spacing: .02em;
}
.lesson-head h1 .hl {
  background: linear-gradient(transparent 68%, rgba(232,204,126,.55) 68%);
  padding: 0 2px;
}
.lesson-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-top: 16px;
  font-size: 13px;
  color: var(--ink-mid);
}
.pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: transparent;
  border: 1px solid var(--rule);
  padding: 3px 14px;
  font-size: 11.5px;
  font-weight: 400;
  letter-spacing: .06em;
  color: var(--ink-mid);
}
.pill.free { background: var(--gold); border-color: var(--gold); color: #fff; font-weight: 500; }
.pill.members-only { background: var(--ink); border-color: var(--ink); color: var(--cream); font-weight: 400; }

.complete-btn {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--cream);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .1em;
  padding: 11px 28px;
  transition: all .2s;
}
.complete-btn:hover { background: transparent; color: var(--ink); }
.complete-btn.is-done {
  background: transparent;
  color: var(--ok);
  border-color: var(--ok);
}

/* description & chapters */
.card {
  background: #FDFBF8;
  border: 1px solid var(--rule);
  padding: 28px 30px;
  margin-top: 26px;
}
.card h2 {
  font-family: var(--label);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--ink-mid);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.card h2::before {
  content: "";
  width: 7px; height: 7px;
  background: var(--gold);
  transform: rotate(45deg);
}
.desc {
  font-size: 14.5px;
  font-weight: 300;
  line-height: 2;
  color: var(--ink-mid);
}

.chapter-list { list-style: none; }
.chapter-list li {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 10px 4px;
  border-bottom: 1px solid var(--rule);
  font-size: 13.5px;
  font-weight: 300;
}
.chapter-list li:last-child { border-bottom: none; }
.chapter-time {
  font-family: var(--label);
  font-variant-numeric: tabular-nums;
  font-weight: 400;
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--gold);
  flex-shrink: 0;
}

/* prev / next */
.pager {
  display: flex;
  gap: 14px;
  margin-top: 36px;
}
.pager a {
  flex: 1;
  min-width: 0;
  text-decoration: none;
  background: transparent;
  border: 1px solid var(--rule);
  padding: 18px 22px;
  color: var(--ink);
  transition: all .2s;
}
.pager a:hover { border-color: var(--ink); background: #FDFBF8; }
.pager a.next { text-align: right; }
.pager a.disabled { visibility: hidden; }
.pager .dir {
  font-family: var(--label);
  font-size: 9px;
  font-weight: 500;
  color: var(--ink-light);
  letter-spacing: .24em;
  text-transform: uppercase;
}
.pager .pg-title {
  font-family: var(--serif);
  font-size: 13.5px;
  font-weight: 500;
  margin-top: 6px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.pager a.next .dir::after { content: " →"; color: var(--gold); }
.pager a.prev .dir::before { content: "← "; color: var(--gold); }

/* overlay for mobile */
.overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(26,26,26,.45);
  z-index: 29;
}

@media (max-width: 900px) {
  .sidebar {
    position: fixed;
    left: 0; top: 0;
    z-index: 30;
    transform: translateX(-100%);
    transition: transform .3s cubic-bezier(.22,1,.36,1);
    width: min(var(--sidebar-w), 86vw);
  }
  body.nav-open .sidebar { transform: translateX(0); }
  body.nav-open .overlay { display: block; }
  .menu-btn { display: grid; place-items: center; }
  .topbar { padding: 10px 16px; }
  .content { padding: 22px 16px 70px; }
  .lesson-head h1 { font-size: 20px; }
  .complete-btn { margin-left: 0; width: 100%; justify-content: center; }
  .lesson-meta { gap: 8px; }
  .pager { flex-direction: column; }
  .pager a.disabled { display: none; }
  .pager a.next { text-align: left; }
}