:root {
  --ink: #17284b;
  --muted: #64718a;
  --paper: #fffdf7;
  --paper-soft: #f8f2e7;
  --line: rgba(45, 50, 81, 0.14);
  --accent: #b86933;
  --accent-dark: #78411f;
  --accent-soft: #f7dec9;
  --navy: #192647;
  --navy-deep: #0d1730;
  --success: #19865d;
  --danger: #b33d3d;
  --shadow: 0 24px 70px rgba(9, 18, 39, 0.19);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 17px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--navy-deep);
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  color: var(--ink);
  font-family: Georgia, "Times New Roman", "Noto Serif TC", serif;
  background:
    radial-gradient(circle at 18% 12%, rgba(255, 198, 126, 0.16), transparent 30rem),
    radial-gradient(circle at 88% 75%, rgba(113, 144, 219, 0.16), transparent 34rem),
    linear-gradient(145deg, #111b38 0%, #202d52 55%, #101831 100%);
}

body[data-common-expression-system="written"] { --accent: #9b6f32; --accent-dark: #664413; --accent-soft: #f5e5c8; }
body[data-common-expression-system="rhetorical-speaking"] { --accent: #8b4f86; --accent-dark: #593054; --accent-soft: #f0dcef; }
body[data-common-expression-system="rhetorical-writing"] { --accent: #7b4b76; --accent-dark: #4c2949; --accent-soft: #ead8e8; }
body[data-common-expression-system="professional-message"] { --accent: #2f7271; --accent-dark: #194847; --accent-soft: #d9efeb; }
body[data-common-expression-system="business-speaking"] { --accent: #3d618a; --accent-dark: #223f63; --accent-soft: #dae7f4; }

button,
input,
textarea { font: inherit; }

button,
a { -webkit-tap-highlight-color: transparent; }

button { color: inherit; }

[hidden] { display: none !important; }

.skip-link {
  position: fixed;
  z-index: 999;
  top: 8px;
  left: 8px;
  padding: 10px 14px;
  border-radius: 10px;
  color: #fff;
  background: var(--navy);
  transform: translateY(-150%);
}

.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  z-index: 80;
  top: 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(249, 247, 241, 0.94);
  box-shadow: 0 10px 35px rgba(8, 18, 38, 0.13);
  backdrop-filter: blur(18px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: min(1500px, calc(100% - 32px));
  min-height: 72px;
  margin: 0 auto;
}

.edmund-system-switcher__trigger {
  border: 0;
  background: transparent;
}

.header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 9px;
}

.connection-pill,
.user-pill,
.header-button {
  min-height: 42px;
  padding: 10px 15px;
  border: 1px solid rgba(23, 40, 75, 0.13);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  font-weight: 700;
}

.connection-pill[data-state="online"] {
  color: #0f6f4a;
  border-color: rgba(25, 134, 93, 0.26);
  background: #e8f8f0;
}

.connection-pill[data-state="error"] {
  color: #8d2d2d;
  background: #fff0ee;
}

.header-button { cursor: pointer; }
.header-button:hover,
.header-button:focus-visible { border-color: var(--accent); color: var(--accent-dark); }

.app-shell {
  width: min(1500px, calc(100% - 32px));
  margin: 0 auto;
  padding: 34px 0 72px;
}

.view { animation: view-in 260ms ease both; }

@keyframes view-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.glass-panel {
  border: 1px solid rgba(255, 255, 255, 0.58);
  border-radius: var(--radius-xl);
  background: rgba(255, 253, 247, 0.96);
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font: 800 0.78rem/1.2 ui-sans-serif, system-ui, sans-serif;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.login-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(360px, 0.75fr);
  gap: 22px;
  min-height: min(720px, calc(100vh - 150px));
}

.login-hero,
.login-panel {
  position: relative;
  overflow: hidden;
  padding: clamp(34px, 5vw, 72px);
}

.login-hero {
  display: flex;
  align-items: flex-end;
  color: #fffaf2;
  background:
    linear-gradient(140deg, rgba(15, 24, 52, 0.92), rgba(39, 54, 93, 0.9)),
    repeating-linear-gradient(0deg, transparent 0 38px, rgba(255, 255, 255, 0.06) 39px 40px);
}

.login-hero::before {
  content: "“”";
  position: absolute;
  top: -70px;
  right: 30px;
  color: rgba(255, 255, 255, 0.06);
  font-size: clamp(16rem, 32vw, 38rem);
  line-height: 1;
}

.login-hero::after {
  content: "";
  position: absolute;
  top: 28px;
  right: 28px;
  width: 132px;
  height: 132px;
  border: 1px solid rgba(255, 221, 175, 0.52);
  border-radius: 50%;
  box-shadow: inset 0 0 0 10px rgba(255, 255, 255, 0.04);
}

.hero-copy { position: relative; z-index: 1; max-width: 820px; }
.student-label { margin: 0 0 14px; color: #f6c88e; font-size: 1.05rem; font-weight: 700; }
.hero-copy h1 {
  margin: 0;
  font-size: clamp(2.5rem, 5.8vw, 6.6rem);
  line-height: 0.94;
  letter-spacing: -0.045em;
}
.hero-copy h1 span { color: #f4be7d; }
.hero-copy > p:last-child {
  max-width: 720px;
  margin: 28px 0 0;
  color: rgba(255, 255, 255, 0.78);
  font: 500 clamp(1rem, 1.6vw, 1.25rem)/1.75 ui-sans-serif, system-ui, sans-serif;
}

.login-panel {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.login-heading {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 18px;
  align-items: start;
}

.section-number {
  color: var(--accent);
  font-size: 3.4rem;
  line-height: 1;
  opacity: 0.42;
}

.login-heading h2,
.dashboard-hero h1,
.lesson-heading h1,
.exercise-heading h1 {
  margin: 0;
  font-size: clamp(2rem, 3.5vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.035em;
}

.login-heading p:last-child,
.dashboard-hero p,
.lesson-heading p,
.exercise-heading p {
  color: var(--muted);
  font: 500 1rem/1.7 ui-sans-serif, system-ui, sans-serif;
}

.login-form { display: grid; gap: 18px; margin-top: 34px; }
.field { display: grid; gap: 8px; }
.field > span:first-child { font: 750 0.88rem/1.2 ui-sans-serif, system-ui, sans-serif; }
.field input,
.answer-field {
  width: 100%;
  border: 1px solid rgba(23, 40, 75, 0.18);
  border-radius: 15px;
  color: var(--ink);
  background: #fff;
  outline: none;
}
.field input { min-height: 54px; padding: 13px 16px; }
.field input:focus,
.answer-field:focus { border-color: var(--accent); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 16%, transparent); }

.password-field { display: grid; grid-template-columns: 1fr auto; gap: 8px; }
.password-field button {
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--paper-soft);
  cursor: pointer;
}

.form-status { min-height: 1.35em; margin: -4px 0 0; color: var(--muted); font: 650 0.9rem/1.4 ui-sans-serif, system-ui, sans-serif; }
.form-status[data-state="error"] { color: var(--danger); }

.primary-button,
.secondary-button,
.danger-button,
.text-button {
  min-height: 50px;
  padding: 12px 20px;
  border-radius: 14px;
  font-weight: 800;
  cursor: pointer;
}
.primary-button {
  color: #fff;
  border: 1px solid var(--accent);
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  box-shadow: 0 8px 0 color-mix(in srgb, var(--accent-dark) 82%, #000);
}
.primary-button:hover,
.primary-button:focus-visible { transform: translateY(-1px); filter: saturate(1.08); }
.primary-button:active { transform: translateY(4px); box-shadow: 0 4px 0 var(--accent-dark); }
.primary-button:disabled { cursor: wait; filter: grayscale(0.5); opacity: 0.7; }
.secondary-button { color: var(--ink); border: 1px solid var(--line); background: #fff; }
.danger-button { color: #9b2d2d; border: 1px solid #efcaca; background: #fff2f0; }
.text-button { min-height: auto; padding: 8px 11px; border: 0; color: var(--accent-dark); background: transparent; }
.login-button { width: 100%; }
.account-note { margin: 28px 0 0; color: var(--muted); font: 500 0.88rem/1.6 ui-sans-serif, system-ui, sans-serif; }

.dashboard-hero {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  align-items: end;
  padding: clamp(28px, 4.5vw, 60px);
}
.common-expression-title-secondary { color: var(--accent-dark); }

.dashboard-metrics { display: flex; gap: 12px; flex-wrap: wrap; justify-content: flex-end; }
.metric-card {
  min-width: 150px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--paper-soft);
  text-align: right;
}
.metric-card strong { display: block; color: var(--accent-dark); font-size: 2.25rem; }
.metric-card span { color: var(--muted); font: 700 0.78rem/1.4 ui-sans-serif, system-ui, sans-serif; }

.dashboard-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin: 22px 0;
  padding: 17px 20px;
}
.dashboard-toolbar p { margin: 0; color: var(--muted); font: 600 0.92rem/1.5 ui-sans-serif, system-ui, sans-serif; }
.dashboard-toolbar-actions { display: flex; flex-wrap: wrap; gap: 10px; }

.common-progress-panel {
  display: grid;
  gap: 18px;
  margin: 0 0 22px;
  padding: clamp(22px, 3vw, 38px);
  scroll-margin-top: 92px;
}
.common-progress-heading,
.common-progress-card-heading,
.common-progress-day-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
}
.common-progress-heading h2 { margin: 0; font-size: clamp(2rem, 3vw, 3.4rem); }
.common-progress-heading p,
.common-progress-card-heading p { margin: 7px 0 0; color: var(--muted); font: 600 .9rem/1.55 ui-sans-serif, system-ui, sans-serif; }
.common-progress-full-link { display: inline-flex; align-items: center; justify-content: center; text-decoration: none; }
.common-progress-card {
  padding: clamp(18px, 2.8vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, .76);
}
.common-progress-card h3 { margin: 0; font-size: 1.55rem; }
.common-progress-range { display: flex; flex-wrap: wrap; gap: 8px; margin: 20px 0 14px; }
.common-progress-range button {
  min-height: 38px;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: #fff;
  cursor: pointer;
  font: 800 .78rem/1 ui-sans-serif, system-ui, sans-serif;
}
.common-progress-range button[aria-pressed="true"] { color: #fff; border-color: var(--accent); background: var(--accent); }
.common-cumulative-toggle[aria-pressed="true"] { color: #6b21a8; border-color: #d8b4fe; background: #faf5ff; }
.common-progress-stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; margin-bottom: 14px; }
.common-progress-stats span { padding: 14px; border-radius: 14px; color: var(--muted); background: var(--paper-soft); font: 750 .76rem/1.35 ui-sans-serif, system-ui, sans-serif; }
.common-progress-stats strong { display: block; margin-bottom: 3px; color: var(--ink); font: 900 1.35rem/1.15 Georgia, serif; }
.common-chart-scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: 16px; background: rgba(255,255,255,.68); }
.common-progress-chart { display: block; width: 100%; min-width: 720px; height: auto; }
.common-chart-background { fill: rgba(255,255,255,.62); }
.common-chart-grid { stroke: rgba(23,40,75,.14); stroke-width: 1; }
.common-chart-axis { stroke: rgba(23,40,75,.22); stroke-width: 1.4; }
.common-chart-axis-label { fill: #68728a; font: 800 13px ui-sans-serif, system-ui, sans-serif; }
.common-chart-title { fill: var(--ink); font: 900 13px ui-sans-serif, system-ui, sans-serif; }
.common-chart-empty { fill: #68728a; font: 900 19px ui-sans-serif, system-ui, sans-serif; }
.common-chart-daily-line,
.common-chart-cumulative-line { fill: none; stroke-width: 4; stroke-linecap: round; stroke-linejoin: round; }
.common-chart-question-line { stroke: #315fb3; }
.common-chart-time-line { stroke: #e7782f; }
.common-chart-cumulative-line { stroke: #7e22ce; }
.common-chart-dot { fill: #315fb3; }
.common-chart-cumulative-dot { fill: #7e22ce; }
.common-chart-hit { fill: transparent; cursor: pointer; }
.common-chart-tooltip { opacity: 0; pointer-events: none; transition: opacity .16s ease; }
.common-chart-tooltip line { stroke: rgba(23,40,75,.28); stroke-dasharray: 4 5; }
.common-chart-tooltip rect { fill: #17213a; opacity: .95; }
.common-chart-tooltip text { fill: #fff; font: 850 11px ui-sans-serif, system-ui, sans-serif; }
.common-chart-tooltip text:last-child { fill: #dce6fa; font-size: 10px; }
.common-chart-hover:hover .common-chart-tooltip,
.common-chart-hover:focus .common-chart-tooltip,
.common-chart-hover:focus-visible .common-chart-tooltip { opacity: 1; }
.common-progress-day-panel { margin-top: 14px; padding: 16px; border: 1px solid var(--line); border-radius: 14px; background: var(--paper-soft); }
.common-progress-day-heading h4 { margin: 7px 0; }
.common-progress-day-row { display: grid; grid-template-columns: minmax(180px, .7fr) minmax(0, 1fr) auto; gap: 12px; align-items: center; padding: 12px 0; border-top: 1px solid var(--line); }
.common-progress-day-row span { color: var(--muted); font: 600 .84rem/1.45 ui-sans-serif, system-ui, sans-serif; }
.common-progress-day-row em { color: var(--accent-dark); font-style: normal; font-weight: 800; }
.common-progress-day-row em.is-correct { color: var(--success); }
.common-progress-day-row em.is-time { color: var(--accent-dark); }

.lesson-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.lesson-card,
.empty-library {
  position: relative;
  overflow: hidden;
  min-height: 270px;
  padding: 30px;
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: var(--radius-lg);
  background: rgba(255, 253, 247, 0.96);
  box-shadow: var(--shadow);
}

.lesson-card::after {
  content: "";
  position: absolute;
  right: -45px;
  bottom: -65px;
  width: 210px;
  height: 210px;
  border: 28px solid color-mix(in srgb, var(--accent) 14%, transparent);
  border-radius: 50%;
}

.lesson-card.is-complete {
  border-color: rgba(182, 123, 34, 0.52);
  background:
    radial-gradient(circle at 88% 16%, rgba(255, 255, 255, 0.55), transparent 25%),
    linear-gradient(145deg, #fff8d9, #e5b94f 58%, #c98c25);
  box-shadow: 0 18px 46px rgba(154, 99, 17, 0.2);
}
.lesson-card.is-complete::after { border-color: rgba(111, 67, 8, 0.11); }
.lesson-card.is-complete .lesson-card-number,
.lesson-card.is-complete h2,
.lesson-card.is-complete h3,
.lesson-card.is-complete p,
.lesson-card.is-complete .lesson-card-footer > strong { color: #53340d; }
.lesson-card.is-complete .progress-track { background: rgba(255, 251, 224, 0.58); }
.lesson-card.is-complete .progress-track i { background: linear-gradient(90deg, #9a6311, #68400a); }

.lesson-card-number { color: var(--accent); font: 800 0.8rem/1 ui-sans-serif, system-ui, sans-serif; letter-spacing: 0.16em; }
.lesson-card h2 { margin: 28px 0 8px; font-size: clamp(2rem, 3.1vw, 3.5rem); line-height: 1.02; }
.lesson-card h3 { margin: 0; color: var(--accent-dark); font-size: 1.25rem; }
.lesson-card p { max-width: 760px; color: var(--muted); font: 500 0.96rem/1.65 ui-sans-serif, system-ui, sans-serif; }
.lesson-card-footer { position: relative; z-index: 1; display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 24px; }
.progress-track { flex: 1; height: 9px; overflow: hidden; border-radius: 999px; background: #ece5da; }
.progress-track i { display: block; width: var(--progress, 0%); height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--accent), #e4a46b); }
.lesson-card-actions { display: flex; gap: 8px; }
.star-button,
.round-button {
  min-width: 48px;
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: #fff;
  cursor: pointer;
  font-size: 1.35rem;
}
.star-button[aria-pressed="true"] { color: #b57912; background: #fff5d9; }
.round-button { color: #fff; background: var(--accent); }

.empty-library { grid-column: 1 / -1; display: grid; place-items: center; text-align: center; }
.empty-library-inner { max-width: 690px; }
.empty-library-mark { display: grid; place-items: center; width: 86px; height: 86px; margin: 0 auto 18px; border: 1px solid var(--line); border-radius: 50%; color: var(--accent); background: var(--paper-soft); font-size: 2.4rem; }
.empty-library h2 { margin: 0 0 12px; font-size: 2rem; }
.empty-library p { color: var(--muted); font: 500 1rem/1.7 ui-sans-serif, system-ui, sans-serif; }

.lesson-shell,
.exercise-shell { display: grid; gap: 20px; }
.lesson-heading,
.exercise-heading { padding: clamp(26px, 4vw, 52px); }
.lesson-heading-top,
.exercise-heading-top { display: flex; justify-content: space-between; gap: 18px; align-items: start; }
.lesson-heading .lesson-meta { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 18px; }
.tag { padding: 8px 12px; border-radius: 999px; color: var(--accent-dark); background: var(--accent-soft); font: 750 0.78rem/1 ui-sans-serif, system-ui, sans-serif; }

.lesson-tabs {
  position: sticky;
  z-index: 30;
  top: 86px;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
  padding: 12px;
}
.lesson-tabs button {
  min-height: 60px;
  padding: 9px;
  border: 1px solid var(--line);
  border-radius: 13px;
  color: var(--muted);
  background: #fff;
  cursor: pointer;
  font-weight: 750;
}
.lesson-tabs button[aria-selected="true"] { color: #fff; border-color: var(--accent); background: var(--accent); }
.lesson-tabs small { display: block; margin-top: 3px; font: 600 0.7rem/1.2 ui-sans-serif, system-ui, sans-serif; }

.lesson-content { padding: clamp(24px, 4vw, 50px); }
.content-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.content-card { padding: 22px; border: 1px solid var(--line); border-radius: var(--radius-md); background: #fff; }
.content-card h3 { margin: 0 0 12px; color: var(--accent-dark); font-size: 1.25rem; }
.content-card p { margin: 0; color: var(--muted); font: 500 0.96rem/1.7 ui-sans-serif, system-ui, sans-serif; white-space: pre-line; }
.example-transform { display: grid; grid-template-columns: 1fr auto 1fr; gap: 12px; align-items: stretch; margin-bottom: 14px; }
.example-side { padding: 18px; border: 1px solid var(--line); border-radius: 14px; background: var(--paper-soft); white-space: pre-line; }
.example-side strong { display: block; margin-bottom: 8px; color: var(--accent-dark); }
.example-arrow { align-self: center; color: var(--accent); font-size: 1.7rem; }
.bilingual-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; padding: 0; list-style: none; }
.bilingual-list li { padding: 17px; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.bilingual-list strong { display: block; margin-bottom: 6px; }
.bilingual-list span { color: var(--muted); font: 500 0.87rem/1.5 ui-sans-serif, system-ui, sans-serif; }
.usage-list { display: grid; gap: 12px; counter-reset: usage; }
.usage-card { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 17px; padding: 20px; border: 1px solid var(--line); border-radius: 16px; background: #fff; counter-increment: usage; }
.usage-card::before { content: counter(usage, decimal-leading-zero); display: grid; place-items: center; width: 48px; height: 48px; border-radius: 50%; color: #fff; background: var(--accent); font: 800 0.85rem/1 ui-sans-serif, system-ui, sans-serif; }
.usage-card h3 { margin: 0 0 6px; font-size: 1.12rem; }
.usage-example { margin: 9px 0 4px; color: var(--accent-dark); font-weight: 800; }
.usage-card p:last-child { margin: 0; color: var(--muted); font: 500 0.9rem/1.6 ui-sans-serif, system-ui, sans-serif; }
.summary-list { display: grid; gap: 13px; margin: 0; padding: 0; list-style: none; counter-reset: summary; }
.summary-list li { padding: 18px 20px 18px 68px; border-left: 5px solid var(--accent); border-radius: 13px; background: var(--paper-soft); counter-increment: summary; }
.summary-list li::before { content: counter(summary); display: inline-grid; place-items: center; width: 32px; height: 32px; margin-left: -50px; margin-right: 14px; border-radius: 50%; color: #fff; background: var(--accent); }

.exercise-invite { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding: 22px; border-radius: 18px; background: var(--paper-soft); }
.exercise-invite p { margin: 5px 0 0; color: var(--muted); font: 500 0.92rem/1.5 ui-sans-serif, system-ui, sans-serif; }

.exercise-progress { display: flex; align-items: center; gap: 14px; margin-top: 20px; }
.exercise-progress .progress-track { height: 12px; }
.exercise-progress strong { white-space: nowrap; }
.question-list { display: grid; gap: 18px; }
.question-card { padding: clamp(24px, 4vw, 48px); scroll-margin-top: 92px; }
.question-card.is-correct { border-color: rgba(25, 134, 93, .32); background: rgba(239, 251, 245, .97); }
.question-meta { display: flex; justify-content: space-between; gap: 12px; align-items: center; }
.question-number { color: var(--accent); font: 800 0.82rem/1 ui-sans-serif, system-ui, sans-serif; letter-spacing: 0.12em; }
.prompt-en { margin: 28px 0 10px; font-size: clamp(1.45rem, 2.4vw, 2.45rem); line-height: 1.45; white-space: pre-line; }
.prompt-zh { margin: 0 0 24px; color: var(--muted); font: 500 0.95rem/1.7 ui-sans-serif, system-ui, sans-serif; white-space: pre-line; }
.answer-field { min-height: 150px; padding: 18px; resize: vertical; font-size: 1.15rem; line-height: 1.55; }
.answer-field[readonly] { color: #176b4d; border-color: rgba(25,134,93,.25); background: #f1fbf6; }
.dialogue-answer-fields { min-width: 0; margin: 0; border: 0; padding: 0; }
.dialogue-answer-fields legend { margin-bottom: 10px; font: 750 .88rem/1.2 ui-sans-serif, system-ui, sans-serif; }
.dialogue-answer-row { display: grid; grid-template-columns: 34px minmax(0, 1fr); align-items: start; gap: 10px; margin-top: 10px; }
.dialogue-answer-row strong { padding-top: 15px; color: var(--accent-dark); font: 900 1.05rem/1.2 Georgia, "Times New Roman", serif; }
.dialogue-answer-row .answer-field { min-height: 72px; padding: 13px 15px; resize: vertical; }
.dialogue-answer-note { margin: 9px 0 0 44px; color: var(--muted); font: 650 .78rem/1.45 ui-sans-serif, system-ui, sans-serif; }
.question-inline-actions { display: flex; justify-content: flex-end; margin-top: 7px; }
.question-inline-actions button:disabled { cursor: default; opacity: .42; }
.exercise-submit-bar { position: sticky; z-index: 25; bottom: 12px; display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 18px 20px; }
.exercise-submit-bar p { margin: 4px 0 0; color: var(--muted); font: 600 .82rem/1.45 ui-sans-serif, system-ui, sans-serif; }
.exercise-submit-actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 9px; }
.question-actions { display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; margin-top: 18px; }
.question-actions-right { display: flex; gap: 10px; flex-wrap: wrap; }
.feedback-panel { margin-top: 20px; padding: 20px; border: 1px solid var(--line); border-radius: 16px; }
.feedback-panel[data-state="correct"] { border-color: rgba(25, 134, 93, 0.28); background: #eaf8f1; }
.feedback-panel[data-state="incorrect"] { border-color: rgba(179, 61, 61, 0.25); background: #fff2f0; }
.feedback-panel h3 { margin: 0 0 8px; }
.feedback-panel p { margin: 8px 0 0; white-space: pre-line; }
.answer-key { color: var(--success); font-weight: 800; }
.missing-answer-highlight {
  border-radius: 5px;
  padding: 0 .12em;
  color: #5b4100;
  background: #ffe56f;
  box-shadow: inset 0 -1px 0 rgba(116, 82, 0, .16);
}

.bookmark-panel { padding: clamp(24px, 4vw, 50px); }
.bookmark-panel h1 { margin: 0; font-size: clamp(2rem, 4vw, 4rem); }
.bookmark-list { display: grid; gap: 12px; margin-top: 24px; }
.bookmark-row { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 18px; border: 1px solid var(--line); border-radius: 15px; background: #fff; }
.bookmark-row h3 { margin: 0 0 5px; }
.bookmark-row p { margin: 0; color: var(--muted); }

.toast {
  position: fixed;
  z-index: 200;
  right: max(18px, env(safe-area-inset-right));
  bottom: max(18px, env(safe-area-inset-bottom));
  max-width: min(420px, calc(100% - 36px));
  padding: 15px 18px;
  border-radius: 14px;
  color: #fff;
  background: var(--navy-deep);
  box-shadow: 0 16px 45px rgba(0, 0, 0, 0.28);
  font: 700 0.92rem/1.45 ui-sans-serif, system-ui, sans-serif;
}

.loading-state { display: grid; place-items: center; min-height: 260px; color: var(--muted); }
.loading-spinner { width: 38px; height: 38px; border: 4px solid #e5ddd1; border-top-color: var(--accent); border-radius: 50%; animation: spin 0.75s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

@media (max-width: 980px) {
  .login-layout { grid-template-columns: 1fr; }
  .login-hero { min-height: 520px; }
  .lesson-grid { grid-template-columns: 1fr; }
  .lesson-tabs { top: 76px; grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .content-intro,
  .bilingual-list { grid-template-columns: 1fr; }
  .common-progress-heading { align-items: stretch; flex-direction: column; }
}

@media (max-width: 720px) {
  .header-inner { align-items: flex-start; width: calc(100% - 20px); padding: 9px 0; }
  .header-actions { max-width: 50%; }
  .connection-pill,
  .user-pill,
  .header-button { min-height: 36px; padding: 8px 10px; font-size: 0.76rem; }
  .app-shell { width: calc(100% - 20px); padding-top: 18px; }
  .login-hero,
  .login-panel { padding: 28px 22px; }
  .login-hero { min-height: 430px; }
  .login-heading { grid-template-columns: 1fr; }
  .section-number { font-size: 2.2rem; }
  .password-field { grid-template-columns: 1fr; }
  .password-field button { min-height: 45px; }
  .dashboard-hero,
  .dashboard-toolbar,
  .lesson-heading-top,
  .exercise-heading-top,
  .exercise-invite { align-items: stretch; flex-direction: column; }
  .dashboard-hero { display: flex; }
  .dashboard-metrics { justify-content: stretch; }
  .metric-card { flex: 1 1 120px; text-align: left; }
  .dashboard-toolbar { display: flex; }
  .dashboard-toolbar-actions,
  .common-progress-card-heading,
  .exercise-submit-bar { align-items: stretch; flex-direction: column; }
  .common-progress-stats { grid-template-columns: 1fr; }
  .common-progress-day-row { grid-template-columns: 1fr; gap: 5px; }
  .exercise-submit-actions { display: grid; grid-template-columns: 1fr; }
  .exercise-submit-actions button { width: 100%; }
  .lesson-tabs { position: static; grid-template-columns: 1fr 1fr; }
  .example-transform { grid-template-columns: 1fr; }
  .example-arrow { transform: rotate(90deg); justify-self: center; }
  .usage-card { grid-template-columns: 1fr; }
  .question-actions { flex-direction: column; }
  .question-actions-right { display: grid; grid-template-columns: 1fr 1fr; }
  .question-actions button { width: 100%; }
  .bookmark-row { align-items: stretch; flex-direction: column; }
}

@media print {
  body { color: #111; background: #fff; }
  .site-header,
  .lesson-tabs,
  .header-actions,
  .question-actions,
  .exercise-submit-bar,
  .toast { display: none !important; }
  .app-shell { width: 100%; padding: 0; }
  .glass-panel,
  .lesson-card,
  .question-card { border: 1px solid #bbb; box-shadow: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}