:root {
  color-scheme: light;
  --bg: #f4f1e8;
  --bg-soft: #ebe8dd;
  --surface: #fffdf7;
  --surface-strong: #ffffff;
  --surface-muted: #f0efe8;
  --text: #24302d;
  --text-soft: #65716d;
  --text-faint: #87918d;
  --line: #d9ded8;
  --primary: #38584f;
  --primary-hover: #29463e;
  --primary-soft: #dce8e2;
  --primary-pale: #edf4f0;
  --blue: #557389;
  --blue-soft: #e0eaf0;
  --sand: #b68052;
  --sand-soft: #f3e6d7;
  --success: #3d7259;
  --success-soft: #dcece2;
  --danger: #a14f4f;
  --danger-soft: #f4dfdd;
  --warning: #9b6b27;
  --warning-soft: #f6ead2;
  --shadow: 0 12px 34px rgba(48, 61, 55, 0.08);
  --shadow-high: 0 24px 70px rgba(30, 42, 37, 0.18);
  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;
  --sidebar: 252px;
  --content-max: 1240px;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #17211e;
  --bg-soft: #1d2a26;
  --surface: #202e29;
  --surface-strong: #263630;
  --surface-muted: #1b2824;
  --text: #edf2ef;
  --text-soft: #aab8b3;
  --text-faint: #82918b;
  --line: #3a4a45;
  --primary: #96bdae;
  --primary-hover: #b1d3c6;
  --primary-soft: #304a41;
  --primary-pale: #253a33;
  --blue: #9bb7ca;
  --blue-soft: #2c414e;
  --sand: #d4a879;
  --sand-soft: #473727;
  --success: #8ec0a0;
  --success-soft: #294537;
  --danger: #e39b97;
  --danger-soft: #4b2f2e;
  --warning: #e5bd79;
  --warning-soft: #4a3d25;
  --shadow: 0 12px 34px rgba(0, 0, 0, 0.18);
  --shadow-high: 0 24px 70px rgba(0, 0, 0, 0.42);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 88% 6%, color-mix(in srgb, var(--primary-soft) 65%, transparent) 0, transparent 28rem),
    var(--bg);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

button,
input,
select,
textarea {
  color: inherit;
  font: inherit;
}

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

button {
  border: 0;
}

a {
  color: var(--primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  line-height: 1.16;
  letter-spacing: -0.025em;
}

h1 {
  margin-bottom: 10px;
  font-size: clamp(2rem, 4vw, 3.25rem);
}

h2 {
  font-size: clamp(1.35rem, 2vw, 1.75rem);
}

h3 {
  font-size: 1.08rem;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 8px;
  left: 8px;
  padding: 10px 14px;
  color: #fff;
  background: var(--primary);
  border-radius: 8px;
  transform: translateY(-150%);
}

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

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--blue) 65%, white);
  outline-offset: 3px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.muted {
  color: var(--text-soft);
}

.tiny {
  color: var(--text-soft);
  font-size: 0.78rem;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 9px;
  color: var(--primary);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 20px;
  height: 2px;
  content: "";
  background: currentColor;
  border-radius: 999px;
}

.app-shell {
  min-height: 100vh;
  padding-left: var(--sidebar);
}

.sidebar {
  position: fixed;
  z-index: 40;
  inset: 0 auto 0 0;
  display: flex;
  width: var(--sidebar);
  flex-direction: column;
  padding: 26px 18px 18px;
  overflow-y: auto;
  color: #f8fbf9;
  background:
    radial-gradient(circle at 20% -10%, rgba(255,255,255,.13), transparent 14rem),
    #2f4b43;
  border-right: 1px solid rgba(255,255,255,.08);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 2px 8px 28px;
  color: #fff;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  place-items: center;
  color: #2f4b43;
  background: #f4ead5;
  border: 1px solid rgba(255,255,255,.26);
  border-radius: 13px;
  font-size: 0.9rem;
  font-weight: 900;
  letter-spacing: -0.06em;
  box-shadow: inset 0 0 0 3px rgba(255,255,255,.25);
}

.brand-copy strong,
.brand-copy span {
  display: block;
}

.brand-copy strong {
  font-size: 1.12rem;
  letter-spacing: -0.02em;
}

.brand-copy span {
  margin-top: 1px;
  color: rgba(255,255,255,.67);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-label {
  padding: 0 11px 7px;
  color: rgba(255,255,255,.48);
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.main-nav {
  display: grid;
  gap: 5px;
}

.nav-link {
  display: flex;
  min-height: 45px;
  align-items: center;
  gap: 11px;
  padding: 10px 12px;
  color: rgba(255,255,255,.78);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 12px;
  cursor: pointer;
  text-align: left;
  text-decoration: none;
  transition: background .18s ease, color .18s ease, transform .18s ease;
}

.nav-link:hover {
  color: #fff;
  background: rgba(255,255,255,.08);
}

.nav-link.active {
  color: #fff;
  background: rgba(255,255,255,.13);
  border-color: rgba(255,255,255,.10);
  box-shadow: inset 3px 0 0 #e5c79b;
}

.nav-link svg,
.icon-button svg,
.button svg,
.stat-icon svg,
.inline-icon svg {
  width: 20px;
  height: 20px;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.sidebar-spacer {
  flex: 1;
  min-height: 28px;
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 10px 4px;
  border-top: 1px solid rgba(255,255,255,.12);
}

.avatar {
  display: grid;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  place-items: center;
  color: #2f4b43;
  background: #e4d3b5;
  border-radius: 12px;
  font-weight: 850;
}

.sidebar-user-copy {
  min-width: 0;
  flex: 1;
}

.sidebar-user-copy strong,
.sidebar-user-copy span {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-user-copy strong {
  font-size: .86rem;
}

.sidebar-user-copy span {
  color: rgba(255,255,255,.57);
  font-size: .71rem;
}

.sidebar-logout {
  width: 38px;
  height: 38px;
  color: rgba(255,255,255,.7);
  background: transparent;
  border-radius: 10px;
  cursor: pointer;
}

.sidebar-logout:hover {
  color: #fff;
  background: rgba(255,255,255,.1);
}

.mobile-header {
  display: none;
}

.sidebar-scrim {
  display: none;
}

.main-area {
  min-height: 100vh;
}

.content-wrap {
  width: min(100%, calc(var(--content-max) + 64px));
  margin: 0 auto;
  padding: 42px 32px 80px;
}

.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}

.page-header p {
  max-width: 720px;
  margin: 0;
  color: var(--text-soft);
}

.page-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.card {
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.card-pad {
  padding: 24px;
}

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 10px 16px;
  color: #fff;
  background: var(--primary);
  border: 1px solid transparent;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 750;
  text-decoration: none;
  transition: background .18s ease, transform .18s ease, border-color .18s ease;
}

.button:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.button:active {
  transform: translateY(0);
}

.button.secondary {
  color: var(--text);
  background: var(--surface-strong);
  border-color: var(--line);
}

.button.secondary:hover {
  background: var(--surface-muted);
}

.button.ghost {
  color: var(--primary);
  background: transparent;
  border-color: color-mix(in srgb, var(--primary) 28%, var(--line));
}

.button.ghost:hover {
  background: var(--primary-pale);
}

.button.danger {
  color: var(--danger);
  background: var(--danger-soft);
  border-color: color-mix(in srgb, var(--danger) 30%, transparent);
}

.button.small {
  min-height: 36px;
  padding: 7px 11px;
  border-radius: 9px;
  font-size: .82rem;
}

.button:disabled {
  cursor: not-allowed;
  opacity: .55;
  transform: none;
}

.icon-button {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  cursor: pointer;
}

.grid {
  display: grid;
  gap: 18px;
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.stat-card {
  position: relative;
  min-height: 142px;
  padding: 20px;
  overflow: hidden;
}

.stat-card::after {
  position: absolute;
  right: -30px;
  bottom: -48px;
  width: 115px;
  height: 115px;
  content: "";
  background: var(--primary-soft);
  border-radius: 50%;
  opacity: .45;
}

.stat-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.stat-icon {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  color: var(--primary);
  background: var(--primary-pale);
  border-radius: 12px;
}

.stat-label {
  color: var(--text-soft);
  font-size: .77rem;
  font-weight: 700;
}

.stat-value {
  position: relative;
  z-index: 1;
  font-size: 1.9rem;
  font-weight: 850;
  letter-spacing: -.04em;
}

.stat-note {
  position: relative;
  z-index: 1;
  color: var(--text-soft);
  font-size: .78rem;
}

.hero-card {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(240px, .55fr);
  gap: 24px;
  padding: clamp(24px, 4vw, 42px);
  overflow: hidden;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--primary-pale) 78%, var(--surface)) 0%, var(--surface) 72%);
}

.hero-card::before {
  position: absolute;
  top: -60px;
  right: 18%;
  width: 190px;
  height: 190px;
  content: "";
  background: var(--sand-soft);
  border-radius: 46% 54% 68% 32% / 48% 44% 56% 52%;
  opacity: .55;
}

.hero-copy,
.hero-side {
  position: relative;
  z-index: 1;
}

.hero-copy h2 {
  max-width: 620px;
  margin-bottom: 12px;
  font-size: clamp(1.6rem, 3vw, 2.35rem);
}

.hero-copy p {
  max-width: 650px;
  color: var(--text-soft);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 22px 0;
}

.hero-side {
  display: grid;
  align-content: center;
  padding: 20px;
  background: color-mix(in srgb, var(--surface-strong) 83%, transparent);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.hero-side .progress-bar {
  margin: 13px 0 8px;
}

.pill,
.status-pill {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  color: var(--text-soft);
  background: var(--surface-muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: .73rem;
  font-weight: 720;
}

.pill.sage,
.status-pill.done {
  color: var(--success);
  background: var(--success-soft);
  border-color: transparent;
}

.pill.sand {
  color: var(--warning);
  background: var(--warning-soft);
  border-color: transparent;
}

.pill.aqua {
  color: var(--blue);
  background: var(--blue-soft);
  border-color: transparent;
}

.status-pill.open {
  color: var(--blue);
  background: var(--blue-soft);
  border-color: transparent;
}

.section-block {
  margin-top: 30px;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 15px;
}

.section-head h2,
.section-head h3 {
  margin-bottom: 3px;
}

.section-head p {
  margin: 0;
  color: var(--text-soft);
  font-size: .88rem;
}

.progress-bar {
  height: 8px;
  overflow: hidden;
  background: var(--bg-soft);
  border-radius: 999px;
}

.progress-bar > span {
  display: block;
  width: var(--progress, 0%);
  height: 100%;
  background: linear-gradient(90deg, var(--primary), color-mix(in srgb, var(--primary) 70%, var(--blue)));
  border-radius: inherit;
  transition: width .5s ease;
}

.grade-card {
  position: relative;
  padding: 22px;
  overflow: hidden;
  cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.grade-card:hover {
  border-color: color-mix(in srgb, var(--primary) 35%, var(--line));
  box-shadow: 0 16px 38px rgba(48,61,55,.11);
  transform: translateY(-2px);
}

.grade-number {
  display: grid;
  width: 44px;
  height: 44px;
  margin-bottom: 28px;
  place-items: center;
  color: var(--primary);
  background: var(--primary-pale);
  border-radius: 13px;
  font-weight: 900;
}

.grade-card h3 {
  margin-bottom: 6px;
}

.grade-card p {
  min-height: 42px;
  margin-bottom: 16px;
  color: var(--text-soft);
  font-size: .82rem;
}

.grade-progress-copy {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
  color: var(--text-soft);
  font-size: .72rem;
  font-weight: 700;
}

.activity-list {
  display: grid;
}

.activity-row {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 14px 2px;
  border-bottom: 1px solid var(--line);
}

.activity-row:last-child {
  border-bottom: 0;
}

.activity-dot {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  color: var(--success);
  background: var(--success-soft);
  border-radius: 10px;
  font-weight: 900;
}

.activity-dot.wrong {
  color: var(--danger);
  background: var(--danger-soft);
}

.activity-copy strong,
.activity-copy span {
  display: block;
}

.activity-copy strong {
  font-size: .88rem;
}

.activity-copy span,
.activity-time {
  color: var(--text-soft);
  font-size: .72rem;
}

.subject-card {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  align-items: start;
  gap: 18px;
  padding: 24px;
  color: var(--text);
  text-decoration: none;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}

.subject-card:hover {
  border-color: color-mix(in srgb, var(--primary) 32%, var(--line));
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.subject-card-icon,
.intro-icon {
  display: grid;
  place-items: center;
  color: var(--primary);
  background: var(--primary-soft);
  border-radius: 18px;
}

.subject-card.biology .subject-card-icon {
  color: var(--blue);
  background: var(--blue-soft);
}

.subject-card-icon { width: 76px; height: 76px; }
.subject-card-icon svg { width: 38px; height: 38px; fill: none; stroke: currentColor; stroke-width: 1.7; }
.subject-card h3 { margin: 3px 0 7px; font-size: 1.35rem; }
.subject-card p { min-height: 48px; margin: 0 0 16px; color: var(--text-soft); font-size: .84rem; }

.subject-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0 0 20px;
}

.subject-tab {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  min-height: 70px;
  padding: 12px 16px;
  color: var(--text);
  background: color-mix(in srgb, var(--surface) 86%, transparent);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
}

.subject-tab svg {
  width: 31px;
  height: 31px;
  padding: 5px;
  color: var(--text-soft);
  background: var(--surface-muted);
  border-radius: 10px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
}

.subject-tab span { font-weight: 820; }
.subject-tab small { color: var(--text-soft); }

.subject-tab.active {
  background: var(--primary-pale);
  border-color: color-mix(in srgb, var(--primary) 42%, var(--line));
  box-shadow: 0 8px 24px color-mix(in srgb, var(--primary) 10%, transparent);
}

.subject-tab.active svg { color: var(--primary); background: var(--primary-soft); }
.subject-tabs.compact { margin-top: -8px; }

.area-selector { margin-bottom: 16px; padding: 20px; }
.area-selector-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 18px; margin-bottom: 16px; }
.area-selector-head h2 { margin: 2px 0 4px; font-size: 1.18rem; }
.area-selector-head p { margin: 0; color: var(--text-soft); font-size: .78rem; }
.area-total { padding: 7px 10px; color: var(--primary); background: var(--primary-pale); border-radius: 999px; font-size: .7rem; font-weight: 780; white-space: nowrap; }
.area-tabs { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 9px; }
.area-tab { display: grid; grid-template-columns: 34px minmax(0, 1fr); align-items: center; gap: 9px; min-height: 58px; padding: 9px 11px; color: var(--text); background: var(--surface-muted); border: 1px solid var(--line); border-radius: 11px; text-decoration: none; }
.area-tab:hover { border-color: color-mix(in srgb, var(--primary) 38%, var(--line)); }
.area-tab.active { color: var(--primary); background: var(--primary-pale); border-color: color-mix(in srgb, var(--primary) 40%, var(--line)); }
.area-tab-index { display: grid; width: 32px; height: 32px; place-items: center; color: var(--primary); background: var(--surface-strong); border-radius: 9px; font-size: .66rem; font-weight: 840; }
.area-tab strong,
.area-tab small { display: block; }
.area-tab strong { font-size: .78rem; }
.area-tab small { margin-top: 2px; color: var(--text-soft); font-size: .65rem; }

.topic-lane {
  padding: 24px;
}

.topic-lane + .topic-lane {
  margin-top: 18px;
}

.topic-lane-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.topic-lane-header .grade-number {
  margin: 0;
}

.topic-lane-header h2,
.topic-lane-header p {
  margin: 0;
}

.topic-lane-header p {
  color: var(--text-soft);
  font-size: .82rem;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.topic-card {
  display: flex;
  min-height: 105px;
  flex-direction: column;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding: 16px;
  color: var(--text);
  background: var(--surface-muted);
  border: 1px solid transparent;
  border-radius: 13px;
  cursor: pointer;
  text-align: left;
}

.topic-card:hover {
  background: var(--primary-pale);
  border-color: color-mix(in srgb, var(--primary) 28%, transparent);
}

.topic-card strong {
  font-size: .87rem;
}

.topic-card .topic-area { color: var(--primary); font-size: .64rem; font-weight: 820; letter-spacing: .07em; text-transform: uppercase; }

.topic-card span {
  color: var(--text-soft);
  font-size: .72rem;
}

.topic-card span b { color: var(--primary); font-weight: 780; }

.topic-intro-launch {
  display: grid;
  width: 100%;
  grid-template-columns: 52px minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  margin: 0 0 18px;
  padding: 17px 20px;
  color: var(--text);
  cursor: pointer;
  text-align: left;
}

.topic-intro-launch:hover {
  border-color: color-mix(in srgb, var(--primary) 32%, var(--line));
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}

.intro-icon { width: 52px; height: 52px; }
.intro-icon svg { width: 28px; height: 28px; fill: none; stroke: currentColor; stroke-width: 1.8; }
.intro-launch-copy small,
.intro-launch-copy strong,
.intro-launch-copy em { display: block; }
.intro-launch-copy small { color: var(--primary); font-size: .68rem; font-weight: 800; letter-spacing: .07em; text-transform: uppercase; }
.intro-launch-copy strong { margin: 1px 0; font-size: 1rem; }
.intro-launch-copy em { color: var(--text-soft); font-size: .76rem; font-style: normal; }
.intro-launch-action { display: flex; align-items: center; gap: 8px; color: var(--primary); font-size: .75rem; font-weight: 780; white-space: nowrap; }
.intro-launch-action svg { width: 17px; height: 17px; fill: none; stroke: currentColor; }

body.overlay-open { overflow: hidden; }

.topic-overlay {
  position: fixed;
  z-index: 100;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(17, 30, 26, .58);
  backdrop-filter: blur(7px);
  animation: fade-in .18s ease;
}

.topic-dialog {
  display: grid;
  width: min(1080px, 100%);
  max-height: min(900px, calc(100vh - 48px));
  grid-template-rows: auto minmax(0, 1fr);
  overflow: hidden;
  color: var(--text);
  background: var(--surface);
  border: 1px solid color-mix(in srgb, var(--line) 78%, transparent);
  border-radius: 24px;
  box-shadow: 0 28px 80px rgba(7, 20, 16, .28);
  animation: pop-in .2s ease;
}

.topic-dialog-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 28px 20px;
  background: color-mix(in srgb, var(--surface) 92%, var(--primary-pale));
  border-bottom: 1px solid var(--line);
}

.topic-dialog-head h2 { margin: 3px 0 4px; font-size: clamp(1.35rem, 2.7vw, 2rem); }
.topic-dialog-head p { max-width: 760px; margin: 0; color: var(--text-soft); font-size: .86rem; }
.topic-dialog-head .icon-button { flex: 0 0 auto; }
.topic-dialog-scroll { overflow-y: auto; overscroll-behavior: contain; scrollbar-gutter: stable; }

.topic-dialog-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, .8fr);
  gap: 24px;
  padding: 26px 28px 12px;
}

.topic-dialog-hero .learning-visual { margin: 0; }
.topic-dialog-index { align-self: stretch; padding: 20px; background: var(--surface-muted); border: 1px solid var(--line); border-radius: var(--radius); }
.topic-dialog-index > .eyebrow { display: block; margin-bottom: 10px; }
.topic-dialog-index button {
  display: grid;
  width: 100%;
  grid-template-columns: 32px minmax(0, 1fr);
  align-items: center;
  gap: 8px;
  padding: 8px 4px;
  color: var(--text);
  background: transparent;
  border-bottom: 1px solid var(--line);
  cursor: pointer;
  font-size: .78rem;
  text-align: left;
}
.topic-dialog-index button:last-child { border-bottom: 0; }
.topic-dialog-index button:hover { color: var(--primary); }
.topic-dialog-index button span { color: var(--primary); font-size: .67rem; font-weight: 820; }

.topic-article { width: min(820px, calc(100% - 56px)); margin: 0 auto; padding: 8px 0 34px; }
.topic-article-section {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 18px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 18px;
}
.section-number { display: grid; width: 42px; height: 42px; place-items: center; color: var(--primary); background: var(--primary-pale); border-radius: 12px; font-size: .72rem; font-weight: 820; }
.topic-article-section h3 { margin: 4px 0 12px; font-size: 1.15rem; }
.topic-article-section p { margin: 0 0 12px; color: var(--text-soft); line-height: 1.75; }
.topic-article-section ul,
.topic-article-section ol { padding-left: 22px; }
.topic-article-section li { margin: 8px 0; color: var(--text-soft); line-height: 1.6; }
.example-problem { padding: 14px 16px; color: var(--text) !important; background: var(--sand-soft); border-left: 3px solid var(--sand); border-radius: 0 12px 12px 0; font-weight: 650; }
.example-result { margin-top: 18px; padding: 14px 16px; background: var(--primary-pale); border-radius: 12px; }
.example-result strong { color: var(--primary); font-size: .72rem; letter-spacing: .06em; text-transform: uppercase; }
.example-result p { margin: 4px 0 0; color: var(--text) !important; }
.self-check { background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--blue-soft) 50%, transparent), transparent); }
.topic-dialog-sources { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px; padding: 20px 0 4px; border-top: 1px solid var(--line); font-size: .76rem; }
.topic-dialog-sources strong { width: 100%; }
.topic-dialog-sources a { display: inline-flex; align-items: center; gap: 5px; color: var(--primary); font-weight: 720; }
.topic-dialog-sources svg { width: 14px; height: 14px; fill: none; stroke: currentColor; }

.learning-visual {
  margin: 18px 0 24px;
  overflow: hidden;
  background: var(--surface-muted);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.topic-intro .learning-visual { margin: 16px 0 0; align-self: start; }
.learning-visual img { width: 100%; aspect-ratio: 3 / 2; object-fit: cover; }
.learning-visual.source-visual { background: #fff; }
.learning-visual.source-visual img { display: block; width: 100%; max-height: 560px; aspect-ratio: auto; object-fit: contain; }

.learning-visual.diagram svg {
  display: block;
  width: 100%;
  max-height: 330px;
  padding: 15px;
  fill: none;
  stroke: var(--primary);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.learning-visual.diagram svg .accent { stroke: var(--sand); }
.learning-visual.diagram svg .soft { stroke: var(--blue); stroke-dasharray: 7 7; }
.learning-visual.diagram svg .dot { fill: var(--primary); stroke: none; }
.learning-visual.diagram svg text { fill: var(--text); stroke: none; font: 700 17px Inter, sans-serif; }
.learning-visual figcaption { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 8px 12px; color: var(--text-soft); background: var(--surface-muted); border-top: 1px solid var(--line); font-size: .7rem; }
.learning-visual figcaption a { display: inline-flex; align-items: center; gap: 4px; color: var(--primary); font-weight: 740; white-space: nowrap; }
.learning-visual figcaption svg { width: 13px; height: 13px; fill: none; stroke: currentColor; }

.filter-bar {
  display: grid;
  grid-template-columns: minmax(210px, 1.7fr) repeat(3, minmax(150px, .75fr));
  gap: 12px;
  margin-bottom: 18px;
  padding: 15px;
}

.field {
  display: grid;
  gap: 7px;
}

.field label,
.field-label {
  color: var(--text-soft);
  font-size: .74rem;
  font-weight: 760;
}

.input,
.select {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  color: var(--text);
  background: var(--surface-strong);
  border: 1px solid var(--line);
  border-radius: 10px;
  outline: none;
  transition: border-color .18s ease, box-shadow .18s ease;
}

.input:focus,
.select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 15%, transparent);
}

.input.invalid,
.select.invalid {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--danger) 12%, transparent);
}

.multi-check-group { min-width: 0; padding: 0; margin: 0; border: 0; }
.multi-check-group legend { padding: 0; color: var(--text-soft); font-size: .74rem; font-weight: 760; }
.multi-check-list { display: grid; gap: 8px; margin-top: 8px; }

.multi-check {
  display: grid;
  grid-template-columns: 21px minmax(0, 1fr);
  align-items: start;
  gap: 10px;
  padding: 11px 12px;
  color: var(--text);
  background: var(--surface-strong);
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
  font-size: .82rem;
}

.multi-check:hover { border-color: var(--primary); }
.multi-check input { width: 18px; height: 18px; margin: 1px 0 0; accent-color: var(--primary); }
.multi-check-group.invalid .multi-check { border-color: color-mix(in srgb, var(--danger) 65%, var(--line)); }

.exercise-list {
  display: grid;
  gap: 12px;
}

.exercise-area-group + .exercise-area-group { margin-top: 34px; }
.exercise-area-head { display: grid; grid-template-columns: 46px minmax(0, 1fr) auto; align-items: center; gap: 14px; margin: 0 0 13px; padding: 0 4px; }
.exercise-area-head h2 { margin: 1px 0 2px; font-size: 1.24rem; }
.exercise-area-head p { margin: 0; color: var(--text-soft); font-size: .76rem; }
.area-mark { display: grid; width: 42px; height: 42px; place-items: center; color: var(--primary); background: var(--primary-pale); border-radius: 12px; font-size: .7rem; font-weight: 840; }
.area-result-count { color: var(--text-faint); font-size: .72rem; font-weight: 740; }
.exercise-area-label { display: inline-block; margin-bottom: 3px; color: var(--primary); font-size: .62rem; font-weight: 820; letter-spacing: .07em; text-transform: uppercase; }

.exercise-row {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr) auto;
  align-items: center;
  gap: 17px;
  padding: 18px;
  color: var(--text);
  text-decoration: none;
  transition: border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}

.exercise-row:hover {
  border-color: color-mix(in srgb, var(--primary) 35%, var(--line));
  box-shadow: 0 13px 30px rgba(48,61,55,.09);
  transform: translateY(-1px);
}

.exercise-index {
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  color: var(--primary);
  background: var(--primary-pale);
  border-radius: 13px;
  font-size: .82rem;
  font-weight: 850;
}

.exercise-index.done {
  color: var(--success);
  background: var(--success-soft);
}

.exercise-copy h3 {
  margin-bottom: 5px;
}

.exercise-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
  color: var(--text-soft);
  font-size: .73rem;
}

.difficulty {
  letter-spacing: 2px;
}

.exercise-arrow {
  color: var(--text-faint);
  font-size: 1.35rem;
}

.empty-state {
  padding: 44px 24px;
  color: var(--text-soft);
  text-align: center;
}

.empty-illustration {
  display: grid;
  width: 60px;
  height: 60px;
  margin: 0 auto 15px;
  place-items: center;
  color: var(--primary);
  background: var(--primary-pale);
  border-radius: 18px;
  font-size: 1.6rem;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
  margin-bottom: 20px;
  color: var(--text-soft);
  font-size: .78rem;
}

.breadcrumbs button {
  padding: 0;
  color: var(--primary);
  background: transparent;
  cursor: pointer;
}

.exercise-switcher {
  display: grid;
  grid-template-columns: minmax(170px, auto) 1fr minmax(170px, auto);
  align-items: center;
  gap: 12px;
  margin: -4px 0 18px;
}

.exercise-switcher.bottom { margin: 30px 0 0; padding-top: 22px; border-top: 1px solid var(--line); }
.exercise-switch-button { justify-content: center; }
.exercise-switch-button.next { grid-column: 3; }
.exercise-switch-button.disabled { color: var(--text-faint); cursor: not-allowed; opacity: .55; }
.exercise-position { grid-column: 2; grid-row: 1; color: var(--text-faint); font-size: .72rem; font-weight: 720; text-align: center; }

.exercise-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 310px;
  gap: 20px;
  align-items: start;
}

.exercise-main {
  padding: clamp(22px, 4vw, 38px);
}

.exercise-main h1 {
  font-size: clamp(1.75rem, 3.6vw, 2.65rem);
}

.exercise-prompt {
  max-width: 780px;
  margin: 22px 0 18px;
  font-size: 1.05rem;
}

.math-panel {
  padding: 19px 20px;
  margin: 18px 0 26px;
  color: var(--text);
  background: var(--primary-pale);
  border: 1px solid color-mix(in srgb, var(--primary) 20%, var(--line));
  border-radius: 14px;
  font-family: Cambria, "Times New Roman", serif;
  font-size: clamp(1.08rem, 2vw, 1.3rem);
  font-weight: 650;
  line-height: 1.8;
  white-space: pre-wrap;
}

.answer-box {
  padding-top: 23px;
  border-top: 1px solid var(--line);
}

.answer-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 14px 0;
}

.answer-grid.one-column {
  grid-template-columns: minmax(0, 720px);
}

.answer-feedback {
  display: none;
  align-items: flex-start;
  gap: 10px;
  padding: 13px 14px;
  margin: 14px 0;
  border-radius: 11px;
  font-size: .85rem;
}

.answer-feedback.show {
  display: flex;
}

.answer-feedback.correct {
  color: var(--success);
  background: var(--success-soft);
}

.answer-feedback.wrong {
  color: var(--danger);
  background: var(--danger-soft);
}

.solution-section {
  margin-top: 22px;
}

.solution-intro {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 10px;
}

.solution-intro h2,
.solution-intro p {
  margin: 0;
}

.solution-intro p {
  color: var(--text-soft);
  font-size: .8rem;
}

.solution-step {
  display: none;
  padding: 17px;
  margin-top: 10px;
  background: var(--surface-muted);
  border-left: 3px solid var(--primary);
  border-radius: 0 12px 12px 0;
  animation: reveal .25s ease both;
}

.solution-step.revealed {
  display: block;
}

.solution-step strong {
  display: block;
  margin-bottom: 5px;
}

.solution-step p {
  margin: 0;
  color: var(--text-soft);
}

.exercise-side {
  display: grid;
  gap: 14px;
  position: sticky;
  top: 22px;
}

.side-card {
  padding: 18px;
}

.side-card h3 {
  margin-bottom: 12px;
}

.fact-list {
  display: grid;
  gap: 10px;
  margin: 0;
}

.fact-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 9px;
  border-bottom: 1px solid var(--line);
  font-size: .78rem;
}

.fact-row:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.fact-row dt {
  color: var(--text-soft);
}

.fact-row dd {
  margin: 0;
  font-weight: 760;
  text-align: right;
}

.source-card p {
  margin-bottom: 10px;
  color: var(--text-soft);
  font-size: .78rem;
}

.source-card a {
  word-break: break-word;
}

.chart-card {
  padding: 24px;
}

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

.bar-chart {
  display: grid;
  gap: 18px;
  margin-top: 20px;
}

.bar-row {
  display: grid;
  grid-template-columns: 82px minmax(0, 1fr) 65px;
  align-items: center;
  gap: 12px;
}

.bar-label {
  font-size: .82rem;
  font-weight: 760;
}

.bar-track {
  height: 12px;
  overflow: hidden;
  background: var(--bg-soft);
  border-radius: 999px;
}

.bar-track span {
  display: block;
  width: var(--progress, 0%);
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--blue));
  border-radius: inherit;
}

.bar-value {
  color: var(--text-soft);
  font-size: .78rem;
  text-align: right;
}

.source-list {
  display: grid;
  gap: 14px;
}

.source-item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr) auto;
  gap: 15px;
  align-items: start;
  padding: 19px;
}

.source-number {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  color: var(--primary);
  background: var(--primary-pale);
  border-radius: 12px;
  font-weight: 850;
}

.source-item h3 {
  margin-bottom: 5px;
}

.source-item p {
  margin: 0;
  color: var(--text-soft);
  font-size: .8rem;
}

.settings-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, .65fr);
  gap: 18px;
  align-items: start;
}

.form-card {
  padding: 24px;
}

.form-card h2 {
  margin-bottom: 6px;
}

.form-card > p {
  color: var(--text-soft);
  font-size: .83rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.form-grid .full {
  grid-column: 1 / -1;
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.divider {
  height: 1px;
  margin: 26px 0;
  background: var(--line);
}

.spider-card {
  position: relative;
  padding: 24px;
  overflow: hidden;
  background: linear-gradient(145deg, var(--sand-soft), var(--surface));
}

.spider-card::after {
  position: absolute;
  right: -35px;
  bottom: -35px;
  width: 120px;
  height: 120px;
  content: "";
  border: 1px dashed color-mix(in srgb, var(--sand) 35%, transparent);
  border-radius: 50%;
}

.spider-thumb {
  width: 68px;
  height: 68px;
  margin-bottom: 18px;
  object-fit: cover;
  border: 3px solid color-mix(in srgb, var(--surface-strong) 78%, transparent);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.spider-card p {
  color: var(--text-soft);
  font-size: .82rem;
}

.spider-button {
  position: relative;
  z-index: 1;
  width: 100%;
  color: #4a3322;
  background: #e9c99f;
}

.spider-button:hover {
  background: #ddb783;
}

.notice {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  padding: 14px 16px;
  margin-bottom: 20px;
  color: var(--warning);
  background: var(--warning-soft);
  border: 1px solid color-mix(in srgb, var(--warning) 20%, transparent);
  border-radius: 12px;
  font-size: .83rem;
}

.table-card {
  overflow: hidden;
  background: var(--surface);
}

.table-scroll {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: .82rem;
}

th,
td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: middle;
}

td {
  color: var(--text);
  background: var(--surface);
}

th {
  color: var(--text-soft);
  background: var(--surface-muted);
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .06em;
  text-transform: uppercase;
}

tbody tr:last-child td {
  border-bottom: 0;
}

tbody tr:hover td {
  background: color-mix(in srgb, var(--primary-pale) 45%, transparent);
}

.user-cell {
  display: flex;
  align-items: center;
  gap: 10px;
}

.user-cell .avatar {
  width: 34px;
  height: 34px;
  font-size: .76rem;
}

.table-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.subject-access-controls { display: flex; flex-wrap: wrap; gap: 6px; min-width: 172px; }
.subject-access-toggle {
  display: inline-flex;
  min-height: 34px;
  align-items: center;
  gap: 5px;
  padding: 6px 9px;
  color: var(--text-faint);
  background: var(--surface-muted);
  border: 1px solid var(--line);
  border-radius: 9px;
  cursor: pointer;
  font-size: .68rem;
  font-weight: 760;
}
.subject-access-toggle svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 1.8; }
.subject-access-toggle.on { color: var(--primary); background: var(--primary-pale); border-color: color-mix(in srgb, var(--primary) 28%, var(--line)); }
.subject-access-toggle:hover { border-color: var(--primary); }
.subject-access-note { color: var(--text-soft); font-size: .74rem; white-space: nowrap; }
.create-subjects { padding: 0; border: 0; }
.create-subjects legend { margin-bottom: 7px; color: var(--text-soft); font-size: .74rem; font-weight: 760; }
.create-subjects .multi-check span { display: flex; align-items: center; gap: 7px; }
.create-subjects .multi-check svg { width: 17px; height: 17px; fill: none; stroke: var(--primary); }
.create-subjects small { color: var(--text-faint); font-size: .7rem; }
.detail-subjects { display: grid; gap: 3px; margin-top: 22px; padding: 14px 16px; background: var(--surface-muted); border-radius: 12px; }

.admin-tabs {
  display: flex;
  gap: 5px;
  margin-bottom: 17px;
  padding: 5px;
  background: var(--surface-muted);
  border-radius: 12px;
  width: fit-content;
}

.admin-tab {
  min-height: 38px;
  padding: 8px 13px;
  color: var(--text-soft);
  background: transparent;
  border-radius: 9px;
  cursor: pointer;
  font-weight: 740;
}

.admin-tab.active {
  color: var(--text);
  background: var(--surface-strong);
  box-shadow: 0 4px 12px rgba(0,0,0,.06);
}

.login-page {
  display: grid;
  min-height: 100vh;
  grid-template-columns: minmax(360px, .88fr) minmax(480px, 1.12fr);
  background: var(--bg);
}

.login-panel {
  display: grid;
  align-content: center;
  padding: clamp(30px, 7vw, 92px);
  background: var(--surface);
}

.login-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 52px;
}

.login-brand .brand-mark {
  color: #fff;
  background: var(--primary);
}

.login-brand strong,
.login-brand span {
  display: block;
}

.login-brand strong {
  font-size: 1.25rem;
}

.login-brand span {
  color: var(--text-soft);
  font-size: .72rem;
}

.login-box {
  width: min(100%, 430px);
}

.login-box h1 {
  font-size: clamp(2rem, 5vw, 3rem);
}

.login-box > p {
  margin-bottom: 30px;
  color: var(--text-soft);
}

.login-form {
  display: grid;
  gap: 15px;
}

.login-submit {
  width: 100%;
  margin-top: 6px;
}

.login-error {
  display: none;
  padding: 12px;
  color: var(--danger);
  background: var(--danger-soft);
  border-radius: 10px;
  font-size: .82rem;
}

.login-error.show {
  display: block;
}

.login-footnote {
  margin-top: 24px;
  color: var(--text-faint);
  font-size: .73rem;
}

.login-visual {
  position: relative;
  display: grid;
  align-content: center;
  padding: clamp(34px, 6vw, 84px);
  overflow: hidden;
  color: #edf4f0;
  background:
    radial-gradient(circle at 85% 14%, rgba(230,204,163,.28), transparent 18rem),
    linear-gradient(145deg, #41665b 0%, #29463f 100%);
}

.login-visual::before,
.login-visual::after {
  position: absolute;
  content: "";
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 50%;
}

.login-visual::before {
  width: 380px;
  height: 380px;
  top: -110px;
  right: -120px;
}

.login-visual::after {
  width: 230px;
  height: 230px;
  bottom: -90px;
  left: -70px;
}

.login-visual-content {
  position: relative;
  z-index: 1;
  max-width: 650px;
}

.login-visual-content h2 {
  margin-bottom: 18px;
  color: #fff;
  font-size: clamp(2rem, 4.2vw, 4.2rem);
  letter-spacing: -.045em;
}

.login-visual-content > p {
  max-width: 560px;
  color: rgba(255,255,255,.7);
  font-size: clamp(.95rem, 1.4vw, 1.12rem);
}

.visual-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 40px;
}

.visual-step {
  padding: 18px;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.11);
  border-radius: 16px;
  backdrop-filter: blur(8px);
}

.visual-step span {
  display: block;
  margin-bottom: 18px;
  color: #e7c99d;
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .1em;
}

.visual-step strong {
  display: block;
  color: #fff;
  font-size: .85rem;
}

.login-visual small {
  position: absolute;
  z-index: 1;
  right: 36px;
  bottom: 26px;
  color: rgba(255,255,255,.45);
}

.modal-backdrop,
.spider-overlay {
  position: fixed;
  z-index: 100;
  inset: 0;
  display: grid;
  padding: 22px;
  place-items: center;
  background: rgba(17, 29, 25, .62);
  backdrop-filter: blur(7px);
  animation: fade-in .18s ease both;
}

.modal {
  width: min(100%, 560px);
  max-height: calc(100vh - 44px);
  padding: 25px;
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-high);
  animation: pop-in .22s ease both;
}

.modal-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

.modal-head h2,
.modal-head p {
  margin: 0;
}

.modal-head p {
  color: var(--text-soft);
  font-size: .8rem;
}

.spider-dialog {
  width: min(100%, 520px);
  padding: 12px;
  overflow: hidden;
  color: #2d3834;
  background: #fffaf0;
  border: 1px solid rgba(255,255,255,.45);
  border-radius: 26px;
  box-shadow: var(--shadow-high);
  text-align: center;
  animation: pop-in .25s cubic-bezier(.2,.8,.2,1) both;
}

.spider-dialog img {
  width: 100%;
  max-height: 340px;
  object-fit: cover;
  border-radius: 18px;
}

.spider-dialog-copy {
  padding: 22px 14px 16px;
}

.spider-dialog-copy h2 {
  margin-bottom: 7px;
  font-size: clamp(1.55rem, 5vw, 2.25rem);
}

.spider-dialog-copy p {
  margin: 0;
  color: #6f766f;
}

.toast-region {
  position: fixed;
  z-index: 200;
  right: 18px;
  bottom: 18px;
  display: grid;
  width: min(360px, calc(100vw - 36px));
  gap: 9px;
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 13px 15px;
  color: #fff;
  background: #293b35;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 12px;
  box-shadow: var(--shadow-high);
  font-size: .82rem;
  animation: toast-in .22s ease both;
}

.toast.error {
  background: #743c3c;
}

.loading-page {
  display: grid;
  min-height: 100vh;
  place-items: center;
}

.loader {
  display: grid;
  justify-items: center;
  gap: 14px;
  color: var(--text-soft);
}

.loader-ring {
  width: 38px;
  height: 38px;
  border: 3px solid var(--primary-soft);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes reveal { from { opacity: 0; transform: translateY(-5px); } }
@keyframes fade-in { from { opacity: 0; } }
@keyframes pop-in { from { opacity: 0; transform: scale(.96) translateY(8px); } }
@keyframes toast-in { from { opacity: 0; transform: translateX(14px); } }

@media (max-width: 1120px) {
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .topic-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .filter-bar { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .filter-bar .search-field { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .app-shell { padding-left: 0; padding-top: 68px; }
  .mobile-header {
    position: fixed;
    z-index: 35;
    inset: 0 0 auto 0;
    display: flex;
    height: 68px;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px max(10px, env(safe-area-inset-right));
    background: color-mix(in srgb, var(--surface) 90%, transparent);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(14px);
  }
  .mobile-header .brand { padding: 0; color: var(--text); }
  .mobile-header .brand-copy span { color: var(--text-soft); }
  .mobile-header .brand-mark { width: 38px; height: 38px; color: #fff; background: var(--primary); }
  .sidebar {
    width: min(var(--sidebar), calc(100vw - 44px));
    transform: translateX(-105%);
    transition: transform .22s ease;
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-scrim {
    position: fixed;
    z-index: 39;
    inset: 0;
    display: block;
    background: rgba(16,28,24,.48);
    opacity: 0;
    pointer-events: none;
    transition: opacity .2s ease;
  }
  .sidebar-scrim.show { opacity: 1; pointer-events: auto; }
  .content-wrap { padding: 30px 22px 70px; }
  .exercise-layout { grid-template-columns: 1fr; }
  .exercise-side { position: static; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .progress-subjects { grid-template-columns: 1fr; }
  .topic-dialog-hero { grid-template-columns: 1fr; }
  .login-page { grid-template-columns: 1fr; }
  .login-panel { min-height: 100vh; }
  .login-visual { display: none; }
  .settings-grid { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
  .content-wrap { padding: 24px 15px 64px; }
  .page-header { display: block; }
  .page-actions { margin-top: 16px; }
  .grid-4,
  .grid-3,
  .grid-2,
  .topic-grid,
  .answer-grid,
  .form-grid,
  .exercise-side { grid-template-columns: 1fr; }
  .hero-card { grid-template-columns: 1fr; }
  .filter-bar { grid-template-columns: 1fr; }
  .filter-bar .search-field { grid-column: auto; }
  .subject-tabs { grid-template-columns: 1fr; }
  .subject-card { grid-template-columns: 58px minmax(0, 1fr); padding: 19px; }
  .subject-card-icon { width: 58px; height: 58px; border-radius: 14px; }
  .subject-card-icon svg { width: 30px; height: 30px; }
  .subject-tab { grid-template-columns: 38px minmax(0, 1fr) auto; }
  .area-selector { padding: 15px; }
  .area-selector-head { align-items: flex-start; flex-direction: column; }
  .area-tabs { grid-template-columns: 1fr; }
  .exercise-area-head { grid-template-columns: 42px minmax(0, 1fr); }
  .area-result-count { grid-column: 2; }
  .topic-intro-launch { grid-template-columns: 44px minmax(0, 1fr); padding: 14px; }
  .intro-icon { width: 44px; height: 44px; }
  .intro-launch-action { grid-column: 2; }
  .topic-overlay { padding: 0; }
  .topic-dialog { width: 100%; max-height: 100dvh; min-height: 100dvh; border: 0; border-radius: 0; }
  .topic-dialog-head { padding: 18px 16px 15px; }
  .topic-dialog-head p { font-size: .78rem; }
  .topic-dialog-hero { padding: 18px 16px 8px; }
  .topic-article { width: calc(100% - 32px); }
  .topic-article-section { grid-template-columns: 1fr; gap: 8px; padding: 24px 0; }
  .exercise-row { grid-template-columns: 44px minmax(0, 1fr); gap: 12px; }
  .exercise-arrow { display: none; }
  .exercise-switcher { grid-template-columns: 1fr 1fr; gap: 8px; }
  .exercise-switch-button.next { grid-column: 2; }
  .exercise-position { grid-column: 1 / -1; grid-row: 2; }
  .exercise-switch-button span:not([aria-hidden="true"]) { font-size: .72rem; }
  .learning-visual figcaption { align-items: flex-start; flex-direction: column; }
  .source-item { grid-template-columns: 42px minmax(0, 1fr); }
  .source-item .button { grid-column: 1 / -1; }
  .bar-row { grid-template-columns: 70px minmax(0, 1fr); }
  .bar-value { grid-column: 2; }
  .section-head { align-items: flex-start; flex-direction: column; }
  .activity-time { display: none; }
  .modal-backdrop,
  .spider-overlay { padding: 10px; }
  .modal { max-height: calc(100vh - 20px); padding: 20px; border-radius: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}