:root {
  --ink: #18232e;
  --muted: #637081;
  --paper: #f7f3ec;
  --panel: rgba(255, 252, 245, 0.86);
  --line: rgba(29, 45, 58, 0.14);
  --teal: #0f766e;
  --blue: #325a9b;
  --rose: #bd5b5f;
  --gold: #c08a28;
  --shadow: 0 22px 55px rgba(31, 38, 52, 0.15);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
}

* { box-sizing: border-box; }
html { min-height: 100%; overflow-x: clip; }
body {
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 8% 12%, rgba(192, 138, 40, 0.16), transparent 28%),
    radial-gradient(circle at 90% 18%, rgba(15, 118, 110, 0.16), transparent 30%),
    linear-gradient(135deg, #f3efe6 0%, #e8f0ed 52%, #f7eee9 100%);
}

button, input, select, textarea { font: inherit; letter-spacing: 0; }
button { cursor: pointer; }
button:disabled, input:disabled, select:disabled, textarea:disabled {
  cursor: not-allowed;
  opacity: 0.62;
}

.app-shell {
  width: min(1440px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 24px;
  padding: 24px;
}

.rail {
  position: sticky;
  top: 24px;
  height: calc(100vh - 48px);
  display: flex;
  flex-direction: column;
  padding: 20px;
  border: 1px solid var(--line);
  background: rgba(255, 252, 245, 0.62);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow);
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  text-decoration: none;
  color: inherit;
  min-width: 0;
}
.brand-mark {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  background: var(--ink);
  color: #fffaf1;
  font-weight: 800;
}
.brand strong { display: block; font-size: 19px; }
.brand small { display: block; color: var(--muted); margin-top: 2px; }

.nav-list { display: grid; gap: 10px; margin-top: 34px; }
.nav-item, .mobile-nav button {
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  min-height: 44px;
}
.nav-item {
  text-align: left;
  padding: 0 14px;
}
.nav-item.active, .mobile-nav button.active {
  color: var(--ink);
  border-color: var(--line);
  background: rgba(255,255,255,0.6);
}
.rail-status { margin-top: auto; display: flex; align-items: center; gap: 10px; color: var(--muted); }
.status-dot { width: 10px; height: 10px; border-radius: 99px; background: var(--rose); }
.status-dot.on { background: var(--teal); }

.workspace { min-width: 0; }
.page { display: none; }
.page.active { display: block; }
.daily-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 20px; }
.lesson-card, .soft-panel, .source-panel, .exercise-panel, .account-status-panel {
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
}
.lesson-card { min-height: calc(100vh - 48px); padding: clamp(22px, 3vw, 42px); }
.side-stack { display: grid; gap: 20px; align-content: start; }
.source-panel, .exercise-panel, .soft-panel { padding: 22px; }

.eyebrow { margin: 0 0 8px; color: var(--blue); text-transform: uppercase; font-size: 12px; font-weight: 800; }
h1, h2, h3, p { overflow-wrap: anywhere; }
h1 { margin: 0; font-size: clamp(36px, 5vw, 72px); line-height: 0.98; max-width: 900px; }
h2 { margin: 0; font-size: 25px; }
h3 { margin: 0 0 10px; font-size: 16px; }
p { line-height: 1.68; }
.lesson-hero {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 18px;
  margin-bottom: 18px;
}
.lesson-meta { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 0; }
.pill { border: 1px solid var(--line); background: rgba(255,255,255,0.52); padding: 6px 10px; color: var(--muted); font-size: 13px; }
.scenario { font-size: 18px; color: #394757; max-width: 760px; }
.translation-toggle {
  min-height: 40px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.68);
  color: var(--ink);
  padding: 0 14px;
  white-space: nowrap;
}
.title-translation {
  display: block;
  margin-top: 10px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.5;
}
.translation-line {
  display: block;
  margin-top: 7px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.58;
}
[data-translation][hidden] { display: none; }
.lesson-module {
  border-top: 1px solid var(--line);
  padding-top: 22px;
  margin-top: 24px;
}
.lesson-context {
  border-top: 0;
  padding-top: 0;
  margin-top: 0;
}
.source-module {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 0.45fr);
  gap: 18px;
  align-items: start;
  background: rgba(255,255,255,0.48);
  border: 1px solid var(--line);
  padding: 18px;
}
.source-module a {
  color: var(--blue);
  overflow-wrap: anywhere;
  line-height: 1.55;
}

.dialogue { display: grid; gap: 12px; margin: 14px 0 0; }
.dialogue-line { display: grid; grid-template-columns: 42px 1fr; gap: 10px; align-items: start; }
.speaker { width: 36px; height: 36px; display: grid; place-items: center; background: var(--teal); color: white; font-weight: 800; }
.speech { background: rgba(255,255,255,0.56); border-left: 4px solid var(--gold); padding: 12px 14px; line-height: 1.55; }
.section-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 22px; }
.mini-card { border: 1px solid var(--line); background: rgba(255,255,255,0.52); padding: 14px; min-height: 108px; }
.mini-card strong { display: block; margin-bottom: 6px; color: var(--teal); }
.mini-card small { display: block; color: var(--muted); line-height: 1.5; }
.recap-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.recap-item {
  border-left: 4px solid var(--blue);
  background: rgba(255,255,255,0.5);
  padding: 14px;
}
.recap-item strong { display: block; color: var(--blue); margin-bottom: 6px; }
.recap-item span { display: block; line-height: 1.58; }

.page-header { display: flex; justify-content: space-between; gap: 18px; align-items: center; margin-bottom: 20px; }
.page-header.compact { border: 1px solid var(--line); background: var(--panel); box-shadow: var(--shadow); padding: 22px; }
.page-header h1 { font-size: clamp(32px, 4vw, 52px); }
.month-controls, .search-box, .inline-form { display: flex; gap: 10px; align-items: center; }
.icon-btn { width: 42px; height: 42px; border: 1px solid var(--line); background: rgba(255,255,255,0.65); color: var(--ink); font-size: 28px; line-height: 1; }
input, select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.72);
  min-height: 44px;
  padding: 0 12px;
  color: var(--ink);
}
textarea { min-height: 110px; padding: 12px; resize: vertical; }
form button, .subtle-action {
  min-height: 44px;
  border: 0;
  background: var(--ink);
  color: white;
  padding: 0 16px;
  white-space: nowrap;
}
.subtle-action { margin-top: 12px; background: rgba(24,35,46,0.1); color: var(--ink); }

.calendar-grid { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 10px; }
.calendar-cell { min-height: 132px; border: 1px solid var(--line); background: rgba(255,255,255,0.58); padding: 12px; display: flex; flex-direction: column; gap: 8px; }
.calendar-cell.empty { opacity: 0.38; }
.day-num { font-weight: 800; color: var(--muted); }
.day-title { font-weight: 800; line-height: 1.28; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.day-level { margin-top: auto; color: var(--teal); font-size: 12px; font-weight: 800; }

.lesson-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.lesson-row { border: 1px solid var(--line); background: var(--panel); padding: 18px; box-shadow: var(--shadow); }
.lesson-row h3 { font-size: 20px; }
.lesson-row p { color: var(--muted); margin: 10px 0; }
.lesson-row button { border: 0; background: var(--blue); color: white; min-height: 38px; padding: 0 12px; }

.account-layout { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.75fr); gap: 18px; align-items: start; }
.account-status-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.65fr);
  gap: 18px;
  align-items: end;
  margin-bottom: 18px;
  padding: 22px;
}
.account-status-panel[hidden] { display: none; }
.account-status-panel h2 { margin: 0; }
.account-status-panel p { margin: 8px 0 0; color: #394757; }
.wide { grid-column: 1 / -1; }
.account-main-panel { display: grid; gap: 18px; }
.account-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  background: rgba(255,255,255,0.46);
  border: 1px solid var(--line);
  padding: 6px;
}
.account-tabs button {
  min-height: 40px;
  border: 0;
  background: transparent;
  color: var(--muted);
}
.account-tabs button.active {
  background: var(--ink);
  color: white;
}
.account-mode-panel[hidden] { display: none; }
.account-profile-panel, .account-preference-panel { align-self: stretch; }
.panel-title { display: flex; justify-content: space-between; gap: 10px; align-items: baseline; margin-bottom: 14px; }
.panel-title span { font-weight: 850; font-size: 20px; }
.panel-title small { color: var(--muted); text-align: right; }
.panel-title small.message-success { color: var(--teal); }
.panel-title small.message-error { color: var(--rose); }
.panel-title small.message-info { color: var(--blue); }
.form-stack { display: grid; gap: 12px; }
.form-hint {
  margin: -2px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}
.status-box {
  display: grid;
  gap: 4px;
  margin-bottom: 14px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.52);
  padding: 14px;
}
.status-box[hidden] { display: none; }
.status-box strong { color: var(--teal); }
.status-box span { color: var(--muted); font-size: 13px; overflow-wrap: anywhere; }
.preference-row { display: grid; grid-template-columns: 120px 140px 1fr auto; gap: 12px; align-items: end; }
.preference-row label { display: grid; gap: 6px; color: var(--muted); font-size: 13px; }

.subscribe-layout { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr); gap: 18px; }
.subscribe-card { grid-row: span 2; }
.subscription-state { font-size: 42px; margin: 10px 0; font-weight: 900; }
.order-box { margin-top: 14px; color: var(--muted); line-height: 1.6; }
.plan-cards { display: grid; gap: 12px; }
.plan-card {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.55);
  padding: 16px;
}
.plan-card:has(input:checked) {
  border-color: rgba(15, 118, 110, 0.55);
  background: rgba(232, 247, 242, 0.72);
}
.plan-card input { width: 18px; min-height: 18px; }
.plan-card strong { display: block; font-size: 18px; }
.plan-card small { display: block; margin-top: 4px; color: var(--muted); line-height: 1.45; }
.plan-card b { font-size: 28px; color: var(--teal); }
.provider-toggle { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.provider-toggle label { position: relative; }
.provider-toggle input { position: absolute; opacity: 0; inset: 0; }
.provider-toggle span {
  display: grid;
  place-items: center;
  min-height: 42px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.56);
  color: var(--muted);
}
.provider-toggle input:checked + span {
  background: var(--blue);
  color: white;
  border-color: var(--blue);
}
.loading-line { color: var(--muted); }
.error-text { color: var(--rose); }
.success-text { color: var(--teal); }

.mobile-nav { display: none; }

@media (max-width: 980px) {
  body { padding-bottom: calc(78px + env(safe-area-inset-bottom)); }
  .app-shell { display: block; padding: 12px; }
  .rail { position: static; height: auto; margin-bottom: 12px; padding: 14px; }
  .nav-list { display: none; }
  .rail-status { margin-top: 14px; }
  .daily-grid, .subscribe-layout, .account-layout, .account-status-panel, .section-grid, .lesson-list, .source-module, .recap-grid { grid-template-columns: 1fr; }
  .lesson-card { min-height: auto; padding: 22px; }
  .page-header { align-items: stretch; flex-direction: column; }
  .calendar-grid { display: flex; overflow-x: auto; scroll-snap-type: x mandatory; padding-bottom: 8px; }
  .calendar-cell { min-width: 184px; scroll-snap-align: start; }
  .preference-row { grid-template-columns: 1fr; }
  .lesson-hero { display: grid; }
  .search-box, .inline-form, .month-controls { flex-wrap: wrap; }
  .search-box input { min-width: 0; flex: 1 1 180px; }
  .mobile-nav {
    position: fixed;
    left: 12px;
    right: 12px;
    bottom: calc(12px + env(safe-area-inset-bottom));
    z-index: 20;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 6px;
    border: 1px solid var(--line);
    background: rgba(255, 252, 245, 0.9);
    backdrop-filter: blur(18px);
    padding: 8px;
    box-shadow: var(--shadow);
  }
  .mobile-nav button { min-width: 0; font-size: 13px; padding: 0 4px; }
}