:root {
  --bg: #0d1721;
  --surface: #132536;
  --surface-strong: #183447;
  --ink: #eef7fb;
  --muted: #b2c2cc;
  --line: #2d4657;
  --teal: #28c4c0;
  --teal-dark: #139a9a;
  --amber: #f59f2f;
  --coral: #f36b64;
  --green: #48c78e;
  --navy: #e8f4f8;
  --success: var(--green);
  --danger: var(--coral);
  --border: var(--line);
  --text: var(--ink);
  --text-muted: var(--muted);
  --bg-card: var(--surface);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.28);
  --radius: 8px;
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
}



::selection {
  background: rgba(40, 196, 192, 0.28);
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

button:focus-visible,
select:focus-visible,
.flashcard:focus-visible {
  outline: 3px solid rgba(40, 196, 192, 0.45);
  outline-offset: 2px;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 280px 1fr;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 24px 18px;
  background: #132536;
  color: #edf6f8;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand p,
.brand strong {
  display: block;
  line-height: 1.1;
}

.brand p {
  margin: 0 0 4px;
  color: #9eb8c2;
  font-size: 0.8rem;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  background: #0b7f89;
  color: white;
  flex: 0 0 auto;
}

.brand-mark svg {
  width: 28px;
  height: 28px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.nav-list {
  display: grid;
  gap: 6px;
}

.nav-link {
  border: 0;
  width: 100%;
  border-radius: 8px;
  padding: 12px;
  color: #d8e5ea;
  background: transparent;
  display: flex;
  align-items: center;
  gap: 11px;
  text-align: left;
}

.nav-link:hover,
.nav-link.active {
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
}

.icon,
.nav-svg {
  width: 18px;
  height: 18px;
  display: inline-block;
  flex: 0 0 auto;
}

.icon {
  border: 2px solid currentColor;
  border-radius: 5px;
  position: relative;
}

.nav-svg {
  background-color: currentColor;
  -webkit-mask: var(--icon) center / contain no-repeat;
  mask: var(--icon) center / contain no-repeat;
}

.dashboard-svg {
  --icon: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M4 4h7v7H4V4Zm9 0h7v7h-7V4ZM4 13h7v7H4v-7Zm9 0h7v7h-7v-7Z'/%3E%3C/svg%3E");
}

.plan-svg {
  --icon: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M7 2h2v3h6V2h2v3h3v17H4V5h3V2Zm-1 8v10h12V10H6Zm2 3h8v2H8v-2Zm0 4h5v2H8v-2Z'/%3E%3C/svg%3E");
}

.practice-svg {
  --icon: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M11 4h2v10h-2V4Zm1 16a2 2 0 1 1 0-4 2 2 0 0 1 0 4Zm0-18a10 10 0 1 1 0 20 10 10 0 0 1 0-20Z'/%3E%3C/svg%3E");
}

.pbq-svg {
  --icon: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M4 4h7v6H4V4Zm9 0h7v6h-7V4ZM4 14h7v6H4v-6Zm9 0h7v6h-7v-6ZM9 10h2v2h2v2h-2v-2H9v-2Z'/%3E%3C/svg%3E");
}

.flashcards-svg {
  --icon: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M5 3h11a3 3 0 0 1 3 3v13H8a3 3 0 0 1-3-3V3Zm3 18h11v-2H8a1 1 0 0 0 0 2Z'/%3E%3C/svg%3E");
}

.labs-svg {
  --icon: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M9 3h6v2h-1v4.2l5 8.4A3 3 0 0 1 16.4 22H7.6A3 3 0 0 1 5 17.6l5-8.4V5H9V3Zm3 8-5.2 8.7a1 1 0 0 0 .8 1.5h8.8a1 1 0 0 0 .8-1.5L12 11Z'/%3E%3C/svg%3E");
}

.exams-svg {
  --icon: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M6 2h9l5 5v15H6V2Zm8 1.5V8h4.5L14 3.5ZM8 12h8v2H8v-2Zm0 4h8v2H8v-2Z'/%3E%3C/svg%3E");
}

.notes-svg {
  --icon: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M5 3h14v18H5V3Zm3 4h8v2H8V7Zm0 4h8v2H8v-2Zm0 4h5v2H8v-2Z'/%3E%3C/svg%3E");
}

.progress-svg {
  --icon: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M4 20V4h2v14h14v2H4Zm4-4V9h3v7H8Zm5 0V5h3v11h-3Zm5 0v-5h3v5h-3Z'/%3E%3C/svg%3E");
}

.settings-svg {
  --icon: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M13 2v3a7 7 0 0 1 2.1.9l2.1-2.1 3 3-2.1 2.1c.4.7.7 1.4.9 2.1h3v4h-3a7 7 0 0 1-.9 2.1l2.1 2.1-3 3-2.1-2.1c-.7.4-1.4.7-2.1.9v3H9v-3a7 7 0 0 1-2.1-.9l-2.1 2.1-3-3 2.1-2.1A7 7 0 0 1 3 15H0v-4h3c.2-.7.5-1.4.9-2.1L1.8 6.8l3-3 2.1 2.1C7.6 5.5 8.3 5.2 9 5V2h4Zm-2 8a2 2 0 1 0 0 4 2 2 0 0 0 0-4Z'/%3E%3C/svg%3E");
}

.dashboard-icon::after,
.plan-icon::after,
.quiz-icon::after,
.card-icon::after,
.lab-icon::after,
.exam-icon::after,
.progress-icon::after,
.notes-icon::after,
.settings-icon::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-top: 2px solid currentColor;
}

.quiz-icon {
  border-radius: 50%;
}

.card-icon {
  transform: rotate(-5deg);
}

.lab-icon::before {
  content: "";
  position: absolute;
  width: 8px;
  height: 8px;
  border: 2px solid currentColor;
  border-radius: 50%;
  right: -6px;
  bottom: -6px;
  background: #132536;
}

.progress-icon::after {
  inset: auto 3px 3px;
  height: 8px;
  border: 0;
  border-left: 3px solid currentColor;
  border-right: 3px solid currentColor;
}

.settings-icon {
  border-radius: 50%;
}

.sidebar-card {
  margin-top: auto;
  padding: 16px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  color: #d9e8ec;
}

.sidebar-card p {
  margin: 10px 0 0;
  color: #b7ccd4;
  font-size: 0.9rem;
}

.streak-days {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 6px;
  margin-top: 14px;
}

.streak-days span {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #52d8d0;
  color: #09222c;
  font-size: 0.72rem;
  font-weight: 900;
}

.mini-meter,
.progress-track {
  height: 8px;
  border-radius: 999px;
  background: #dce7ed;
  overflow: hidden;
}

.mini-meter {
  margin-top: 14px;
  background: rgba(255, 255, 255, 0.16);
}

.mini-meter span,
.progress-track span {
  display: block;
  height: 100%;
  background: var(--teal);
  border-radius: inherit;
}

.mobile-topbar {
  display: none;
}

.main-content {
  padding: 30px;
  min-width: 0;
}

.view {
  display: none;
}

.view.active {
  display: block;
}

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

.compact-header {
  max-width: 1160px;
}

.eyebrow {
  color: var(--teal);
  text-transform: uppercase;
  letter-spacing: 0;
  font-size: 0.76rem;
  font-weight: 800;
  margin: 0 0 8px;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.5rem);
  line-height: 1;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: 1.25rem;
  line-height: 1.2;
}

h3 {
  margin: 0 0 10px;
}

.header-copy {
  max-width: 720px;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.6;
  margin: 14px 0 0;
}

.header-actions,
.split-actions,
.flashcard-controls {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.header-actions {
  justify-content: flex-end;
  align-items: flex-start;
}

.top-stat {
  min-height: 42px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  display: grid;
  place-items: center;
  padding: 0 12px;
  font-weight: 900;
}

.button {
  min-height: 42px;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0 16px;
  font-weight: 800;
  transition:
    transform 0.14s ease,
    background-color 0.14s ease,
    border-color 0.14s ease;
}

.button:hover,
.top-stat:hover {
  transform: translateY(-1px);
}

.button.primary {
  background: var(--teal);
  color: #ffffff;
}

.button.primary:hover {
  background: var(--teal-dark);
}

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

.text-button {
  border: 0;
  background: transparent;
  color: var(--teal);
  font-weight: 900;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(280px, 0.7fr);
  gap: 18px;
  align-items: stretch;
}

.panel,
.readiness-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.panel {
  padding: 20px;
}

.readiness-panel {
  grid-column: span 2;
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 22px;
  align-items: center;
  padding: 28px;
  background: linear-gradient(135deg, var(--surface) 0%, var(--surface-strong) 100%);
}

.readiness-copy h2 {
  font-size: clamp(3.2rem, 10vw, 6rem);
  color: var(--teal);
}

.readiness-copy p:last-child {
  color: var(--muted);
  margin: 8px 0 0;
  line-height: 1.6;
  max-width: 650px;
}

.readiness-ring {
  --value: 0;
  width: 190px;
  height: 190px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  margin-inline: auto;
  background: conic-gradient(var(--teal) 0 calc(var(--value) * 1%), #2d4657 0 100%);
  position: relative;
}

.readiness-ring::after {
  content: "";
  position: absolute;
  inset: 18px;
  border-radius: inherit;
  background: var(--surface);
}

.readiness-ring span {
  position: relative;
  z-index: 1;
  font-size: 1.7rem;
  font-weight: 900;
  display: grid;
  place-items: center;
}

.readiness-ring small {
  display: block;
  color: var(--teal);
  font-size: 0.92rem;
  margin-top: 2px;
}

.readiness-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(120px, 1fr));
  gap: 10px;
  margin-top: 18px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.readiness-stats span {
  display: grid;
  gap: 4px;
}

.readiness-stats strong {
  color: var(--teal);
}

.panel-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 18px;
}

.status-pill {
  border-radius: 999px;
  padding: 6px 10px;
  color: var(--teal-dark);
  background: #dff4f5;
  font-size: 0.78rem;
  font-weight: 800;
  white-space: nowrap;
}

.status-pill.alert {
  color: #8d2424;
  background: #ffe5e2;
}

.focus-line {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  margin: 0 0 8px;
}

.plan-help {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.45;
  margin: 0 0 14px;
}

.plan-progress {
  display: grid;
  gap: 8px;
  margin: 12px 0 14px;
  color: var(--text-muted);
  font-size: 0.86rem;
}

.plan-progress-track {
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border);
}

.plan-progress-fill {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--teal), var(--cyan));
  transition: width 180ms ease;
}

.task-list,
.notes-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}

.task-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
}

.task-list li.complete label span {
  color: var(--teal);
}

.plan-quiz-button {
  flex-shrink: 0;
  padding: 8px 12px;
  font-size: 0.84rem;
}

.task-list.large {
  gap: 16px;
}

.today-panel .task-list {
  margin-bottom: 18px;
}

.task-list label {
  display: flex;
  gap: 10px;
  color: var(--ink);
}

.task-list input {
  accent-color: var(--teal);
  width: 18px;
  height: 18px;
}

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

.domain-row {
  display: grid;
  gap: 7px;
}

.domain-top {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-weight: 800;
}

.domain-top span:last-child {
  color: var(--muted);
}

.quiz-card,
.flash-card {
  background: var(--surface);
}

.mini-scores,
.exam-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  margin: 16px 0;
  color: var(--muted);
}

.mini-scores span,
.exam-meta span {
  display: grid;
  gap: 3px;
}

.mini-scores strong {
  color: var(--teal);
}

.quiz-card p,
.flash-card p,
.lab-preview p,
.exam-card p,
.notes-list,
.evidence-panel,
.lab-feedback {
  color: var(--muted);
  line-height: 1.55;
}

.lab-preview {
  grid-column: span 2;
  display: grid;
  grid-template-columns: 1fr 240px auto;
  align-items: center;
  gap: 20px;
}

.mock-preview {
  grid-column: span 2;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 18px;
}

.network-visual {
  height: 128px;
  border-radius: 8px;
  border: 1px solid #bdd9df;
  background:
    linear-gradient(90deg, transparent 49%, rgba(8, 125, 134, 0.35) 50%, transparent 51%),
    linear-gradient(0deg, transparent 49%, rgba(8, 125, 134, 0.22) 50%, transparent 51%),
    var(--surface-strong);
  position: relative;
}

.node {
  position: absolute;
  width: 28px;
  height: 28px;
  border: 3px solid #ffffff;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 2px rgba(8, 125, 134, 0.25);
}

.user-node {
  left: 22px;
  top: 28px;
}

.firewall-node {
  left: 96px;
  top: 50px;
  background: var(--amber);
}

.server-node {
  right: 34px;
  top: 32px;
}

.alert-node {
  right: 78px;
  bottom: 22px;
  background: var(--coral);
}

.study-layout,
.lab-grid,
.progress-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 18px;
}

.question-meta,
.confidence-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  color: var(--muted);
  margin-bottom: 16px;
}

.confidence-row {
  margin-top: 22px;
  margin-bottom: 0;
}

.question-panel h2 {
  font-size: clamp(1.25rem, 2.5vw, 1.8rem);
  margin-bottom: 20px;
}

.answers {
  display: grid;
  gap: 10px;
}

.answer-button {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  padding: 14px;
  text-align: left;
  min-height: 58px;
}

.answer-button:hover,
.answer-button.selected {
  border-color: var(--teal);
  background: #123f48;
}

.answer-button:hover,
.check-item:hover,
.pbq-row:hover {
  box-shadow: inset 0 0 0 1px rgba(8, 125, 134, 0.18);
}

.answer-button.correct {
  border-color: var(--green);
  background: #133a2a;
}

.answer-button.incorrect {
  border-color: var(--coral);
  background: #47201f;
}

.chip {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--muted);
  border-radius: 999px;
  padding: 7px 12px;
  font-weight: 800;
}

.chip.active {
  border-color: var(--teal);
  color: var(--teal);
  background: #eaf8f9;
}

.explanation-panel {
  align-self: start;
  position: sticky;
  top: 24px;
}

#explanation {
  min-height: 150px;
  color: var(--muted);
  line-height: 1.6;
  margin-bottom: 18px;
}

.flashcard-stage {
  max-width: 780px;
}

.flashcard-summary {
  color: var(--muted);
  font-weight: 800;
  margin: 0 0 12px;
}

.flashcard {
  min-height: 360px;
  background: #14293a;
  color: #ffffff;
  border-radius: 8px;
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  box-shadow: var(--shadow);
  outline: 0;
}

.flashcard .eyebrow {
  color: #79d4dc;
}

.flashcard h2 {
  font-size: clamp(2rem, 6vw, 4rem);
}

.flashcard p:not(.eyebrow) {
  margin-top: 24px;
  color: #cce0e7;
  font-size: 1.15rem;
  line-height: 1.6;
}

.flip-note {
  margin-top: 40px;
  color: #9fbbc6;
  font-weight: 800;
}

.flashcard-controls {
  margin-top: 16px;
  flex-wrap: wrap;
}

.button.trouble {
  border-color: rgba(255, 177, 105, 0.5);
  color: #ffd7a8;
}

.lab-main {
  min-width: 0;
}

.lab-map {
  min-height: 210px;
  border: 1px solid #cddde3;
  border-radius: 8px;
  background: #f1f8fa;
  display: grid;
  grid-template-columns: 1fr 70px 1fr 70px 1fr;
  align-items: center;
  gap: 8px;
  padding: 18px;
  margin-bottom: 18px;
}

.lab-map:hover,
.network-visual:hover {
  border-color: var(--teal);
}

.map-node {
  min-height: 68px;
  border-radius: 8px;
  background: var(--surface);
  border: 1px solid #c9d9df;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 10px;
  font-weight: 900;
  color: var(--navy);
}

.map-link {
  height: 3px;
  background: var(--teal);
  position: relative;
}

.map-link::after {
  content: "";
  position: absolute;
  right: -1px;
  top: -5px;
  border-left: 9px solid var(--teal);
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
}

.server {
  grid-column: 5;
  margin-top: 118px;
  background: #fff7e8;
  color: #764600;
}

.evidence-panel {
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.evidence-panel ul {
  padding-left: 20px;
  margin-bottom: 0;
}

.checklist {
  display: grid;
  gap: 12px;
  margin-bottom: 18px;
}

.check-item {
  display: flex;
  gap: 11px;
  padding: 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
}

.check-item input {
  width: 18px;
  height: 18px;
  accent-color: var(--teal);
  flex: 0 0 auto;
}

.lab-feedback {
  margin-top: 16px;
  padding: 14px;
  border-radius: 8px;
  background: var(--surface-strong);
  min-height: 76px;
}

.exam-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.exam-card.strong {
  background: #effafa;
  border-color: #badde1;
}

.exam-card {
  min-height: 176px;
}

.pbq-card {
  background: var(--surface);
  grid-column: span 2;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 18px;
}

.pbq-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: 18px;
}

.pbq-copy {
  color: var(--muted);
  line-height: 1.55;
  margin: 0 0 18px;
}

.pbq-table {
  display: grid;
  gap: 12px;
}

.pbq-row {
  display: grid;
  grid-template-columns: minmax(180px, 1fr) minmax(180px, 260px);
  align-items: center;
  gap: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  font-weight: 800;
}

.pbq-row select {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  padding: 0 10px;
}

.heatmap {
  display: grid;
  grid-template-columns: repeat(4, minmax(80px, 1fr));
  gap: 10px;
  margin-top: 16px;
}

.heat-cell {
  min-height: 74px;
  border-radius: 8px;
  padding: 10px;
  color: #163042;
  font-weight: 900;
  display: flex;
  align-items: flex-end;
}

.heat-high {
  background: #cdeee8;
}

.heat-mid {
  background: #fff1c9;
}

.heat-low {
  background: #ffe1df;
}

.domain-ring-panel {
  grid-column: span 2;
}

.domain-rings {
  display: grid;
  grid-template-columns: repeat(5, minmax(90px, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.domain-ring {
  display: grid;
  justify-items: center;
  gap: 8px;
  text-align: center;
  color: var(--muted);
}

.mini-ring {
  --value: 72;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: conic-gradient(var(--teal) 0 calc(var(--value) * 1%), #2d4657 0 100%);
  position: relative;
}

.mini-ring::after {
  content: "";
  position: absolute;
  inset: 9px;
  border-radius: inherit;
  background: var(--surface);
}

.mini-ring span {
  position: relative;
  z-index: 1;
  color: var(--ink);
  font-weight: 900;
  font-size: 0.84rem;
}

.settings-panel {
  max-width: 720px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}

.switch {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
}

.switch input {
  width: 22px;
  height: 22px;
  accent-color: var(--teal);
}

.sidebar,
.mobile-topbar {
  background: #07131d;
}

.answer-button:hover,
.answer-button.selected,
.chip.active {
  background: #123f48;
}

.answer-button.correct {
  background: #133a2a;
}

.answer-button.incorrect {
  background: #47201f;
}

.heat-high {
  background: #174f49;
  color: #effaf9;
}

.heat-mid {
  background: #594115;
  color: #fff7e3;
}

.heat-low {
  background: #5c2827;
  color: #fff0ef;
}

.lab-map {
  background:
    radial-gradient(circle at 25% 30%, rgba(40, 196, 192, 0.12), transparent 26%),
    linear-gradient(135deg, #102a3d, #0c2232);
  border-color: #416579;
}

.map-node {
  background: #0b1d2b;
  border-color: #4c7288;
  color: #eef7fb;
  box-shadow: 0 0 0 1px rgba(40, 196, 192, 0.12);
}

.map-link,
.map-link::after {
  background: var(--teal);
}

.map-link::after {
  border-left-color: var(--teal);
}

.server {
  background: #332817;
  color: #ffd992;
  border-color: #755b27;
}

.exam-card.strong {
  background: linear-gradient(135deg, #123846, #132536);
  border-color: #2bc7c1;
  box-shadow: 0 18px 50px rgba(40, 196, 192, 0.1);
}

.exam-card.strong p {
  color: #d2e6ec;
}

@media (max-width: 980px) {
  .app-shell {
    display: block;
  }

  .mobile-topbar {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: #132536;
    color: #ffffff;
  }

  .mobile-topbar .brand p {
    display: none;
  }

  .sidebar {
    position: fixed;
    inset: 66px 0 auto 0;
    z-index: 19;
    height: auto;
    transform: translateY(-130%);
    transition: transform 0.2s ease;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .sidebar > .brand {
    display: none;
  }

  .sidebar.open {
    transform: translateY(0);
  }

  .sidebar-card {
    display: none;
  }

  .icon-button {
    width: 42px;
    height: 42px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    background: transparent;
    display: grid;
    place-content: center;
    gap: 4px;
  }

  .icon-button span {
    width: 18px;
    height: 2px;
    background: #ffffff;
  }

  .main-content {
    padding: 20px 16px 32px;
  }

  .page-header,
  .readiness-panel,
  .lab-preview,
  .mock-preview,
  .study-layout,
  .lab-grid,
  .pbq-grid,
  .progress-grid {
    grid-template-columns: 1fr;
    display: grid;
  }

  .page-header {
    gap: 18px;
  }

  .dashboard-grid,
  .exam-grid {
    grid-template-columns: 1fr;
  }

  .readiness-panel,
  .lab-preview,
  .mock-preview,
  .domain-ring-panel,
  .pbq-card {
    grid-column: auto;
  }

  .readiness-ring {
    width: 160px;
    height: 160px;
  }

  .explanation-panel {
    position: static;
  }

  .lab-map {
    grid-template-columns: 1fr;
  }

  .map-link {
    height: 42px;
    width: 3px;
    justify-self: center;
  }

  .map-link::after {
    right: -5px;
    top: auto;
    bottom: -2px;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-top: 9px solid var(--teal);
    border-bottom: 0;
  }

  .server {
    grid-column: auto;
    margin-top: 0;
  }

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

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

@media (max-width: 560px) {
  .brand.compact strong {
    font-size: 0.92rem;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
  }

  .readiness-panel,
  .panel {
    padding: 16px;
  }

  .task-list li,
  .domain-top {
    align-items: flex-start;
  }

  .header-actions,
  .split-actions,
  .flashcard-controls {
    display: grid;
    grid-template-columns: 1fr;
  }

  .button {
    width: 100%;
  }

  .network-visual {
    width: 100%;
  }

  .focus-line,
  .settings-panel {
    display: grid;
  }

  .pbq-row {
    grid-template-columns: 1fr;
  }
}

/* Quiz Length Picker */
.quiz-length-picker {
  color: var(--text);
  padding: 2rem 0 3rem;
  margin: 0 auto;
}
.quiz-length-picker .eyebrow {
  margin-bottom: 1rem;
  text-align: center;
}
.practice-choice-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
  align-items: stretch;
}
.practice-choice-card {
  min-height: 100%;
}
.practice-domain-filter,
.random-quiz-filter {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(15, 31, 56, 0.64);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
  display: grid;
  gap: 0.85rem;
  margin: 0;
  padding: 1.2rem;
  text-align: left;
}
.practice-choice-card h2,
.random-quiz-title {
  color: var(--ink);
  font-size: 1.1rem;
  font-weight: 900;
  margin: 0;
}
.choice-kicker {
  color: var(--teal);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.16em;
  margin: 0;
  text-transform: uppercase;
}
.practice-domain-filter label {
  color: var(--ink);
  font-size: 1.1rem;
  font-weight: 900;
  letter-spacing: 0.01em;
}
.practice-domain-filter select {
  appearance: none;
  background: #0b1f35;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--ink);
  font: inherit;
  min-height: 44px;
  padding: 0.7rem 0.9rem;
  width: 100%;
}
.field-help {
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.5;
  margin: 0;
}
.quiz-length-options {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}
.quiz-length-options.stacked {
  justify-content: flex-start;
}
.quiz-length-options .button {
  min-width: 120px;
}
.notes-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.9fr);
  gap: 1rem;
  align-items: start;
}
.user-note-editor {
  display: grid;
  gap: 0.85rem;
}
.user-note-editor textarea {
  min-height: 160px;
  resize: vertical;
}
.user-notes-list {
  margin-top: 0.25rem;
}
.user-notes-list li {
  align-items: start;
  border: 1px solid var(--line);
  border-radius: 14px;
  display: grid;
  gap: 0.75rem;
  padding: 0.85rem;
}
.user-note-text {
  color: var(--ink);
  line-height: 1.55;
  white-space: pre-wrap;
}
.empty-notes {
  color: var(--muted);
  font-style: italic;
}
@media (max-width: 900px) {
  .practice-choice-grid,
  .notes-layout {
    grid-template-columns: 1fr;
  }
}

/* 2026 visual refresh: cyber command-center polish */
:root {
  --bg: #06101f;
  --surface: rgba(10, 22, 40, 0.78);
  --surface-strong: rgba(15, 31, 56, 0.9);
  --ink: #f8fbff;
  --muted: #a8b8cc;
  --line: rgba(148, 163, 184, 0.18);
  --teal: #22d3ee;
  --teal-dark: #0891b2;
  --amber: #fbbf24;
  --coral: #fb7185;
  --green: #34d399;
  --navy: #dbeafe;
  --violet: #a78bfa;
  --pink: #f0abfc;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.34);
  --glow: 0 0 36px rgba(34, 211, 238, 0.18);
  --success: var(--green);
  --danger: var(--coral);
  --border: var(--line);
  --text: var(--ink);
  --text-muted: var(--muted);
  --bg-card: var(--surface);
  --radius: 22px;
  color-scheme: dark;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  background:
    radial-gradient(circle at 12% 0%, rgba(34, 211, 238, 0.22), transparent 34rem),
    radial-gradient(circle at 88% 12%, rgba(167, 139, 250, 0.2), transparent 30rem),
    radial-gradient(circle at 50% 100%, rgba(52, 211, 153, 0.1), transparent 34rem),
    linear-gradient(180deg, #050b16 0%, var(--bg) 42%, #050b16 100%);
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  background-image:
    linear-gradient(rgba(34, 211, 238, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 211, 238, 0.055) 1px, transparent 1px);
  background-size: 52px 52px;
  mask-image: linear-gradient(to bottom, #000 0%, transparent 78%);
}

::selection {
  background: rgba(34, 211, 238, 0.35);
  color: #fff;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: #050b16;
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--teal), var(--violet));
  border: 2px solid #050b16;
  border-radius: 999px;
}

.app-shell {
  position: relative;
}

.sidebar {
  border-right: 1px solid rgba(255, 255, 255, 0.1);
  background:
    linear-gradient(180deg, rgba(15, 23, 42, 0.94), rgba(2, 6, 23, 0.96)),
    radial-gradient(circle at top, rgba(34, 211, 238, 0.16), transparent 22rem);
  box-shadow: 18px 0 60px rgba(0, 0, 0, 0.22);
  backdrop-filter: blur(24px);
}

.brand-mark,
.top-stat,
.icon-button {
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.95), rgba(167, 139, 250, 0.85));
  box-shadow: 0 14px 34px rgba(34, 211, 238, 0.22);
}

.brand p,
.eyebrow {
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.nav-link {
  border: 1px solid transparent;
  border-radius: 16px;
  color: rgba(226, 232, 240, 0.82);
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease, color 180ms ease;
}

.nav-link:hover,
.nav-link.active {
  transform: translateX(3px);
  border-color: rgba(34, 211, 238, 0.26);
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.13), rgba(167, 139, 250, 0.12));
  color: #fff;
  box-shadow: inset 0 1px rgba(255, 255, 255, 0.08), 0 12px 28px rgba(0, 0, 0, 0.18);
}

.sidebar-card,
.mobile-topbar,
.panel,
.readiness-panel,
.question-panel,
.flashcard,
.pbq-workspace,
.lab-sim,
.exam-card,
.settings-card,
.quiz-length-picker,
.note-editor,
.modal-content {
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(22px) saturate(130%);
}

.panel,
.readiness-panel,
.question-panel,
.pbq-workspace,
.lab-sim,
.exam-card,
.settings-card,
.quiz-length-picker,
.note-editor,
.modal-content {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
}

.panel::before,
.readiness-panel::before,
.question-panel::before,
.pbq-workspace::before,
.lab-sim::before,
.exam-card::before,
.settings-card::before,
.quiz-length-picker::before,
.note-editor::before {
  position: absolute;
  inset: 0 0 auto;
  height: 1px;
  content: "";
  background: linear-gradient(90deg, transparent, rgba(34, 211, 238, 0.58), transparent);
}

.main-content {
  padding: 34px;
}

.page-header {
  position: relative;
  overflow: hidden;
  margin-bottom: 26px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 32px;
  background:
    radial-gradient(circle at 82% 20%, rgba(167, 139, 250, 0.18), transparent 20rem),
    radial-gradient(circle at 18% 0%, rgba(34, 211, 238, 0.18), transparent 20rem),
    rgba(10, 22, 40, 0.52);
  box-shadow: var(--shadow);
  backdrop-filter: blur(24px);
}

.page-header h1 {
  margin-top: 0.35rem;
  font-size: clamp(2.35rem, 5vw, 5.6rem);
  line-height: 0.95;
  letter-spacing: -0.06em;
  color: var(--ink);
}

#dashboard-title::after {
  display: block;
  content: "Pass cleaner.";
  margin-top: 0.15em;
  background: linear-gradient(90deg, #a5f3fc, #38bdf8, #c4b5fd, #f0abfc);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.header-copy {
  max-width: 760px;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.75;
}

.button {
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  font-weight: 800;
  letter-spacing: -0.01em;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease, background 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button.primary {
  color: #06101f;
  background: linear-gradient(135deg, #67e8f9, #38bdf8 45%, #c4b5fd);
  box-shadow: 0 18px 40px rgba(34, 211, 238, 0.24);
}

.button.secondary,
.text-button,
.status-pill,
.exam-meta span,
.confidence-btn,
.quiz-length-options .button {
  border-color: rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.065);
  color: var(--ink);
  backdrop-filter: blur(12px);
}

.button.secondary:hover,
.text-button:hover,
.confidence-btn:hover {
  border-color: rgba(34, 211, 238, 0.45);
  background: rgba(34, 211, 238, 0.12);
  box-shadow: var(--glow);
}

.dashboard-grid,
.progress-grid,
.study-layout,
.pbq-grid,
.labs-grid,
.exams-grid,
.settings-grid {
  gap: 20px;
}

.readiness-panel {
  background:
    radial-gradient(circle at 72% 22%, rgba(34, 211, 238, 0.28), transparent 18rem),
    linear-gradient(135deg, rgba(8, 47, 73, 0.92), rgba(30, 41, 59, 0.82));
}

.readiness-copy h2 {
  background: linear-gradient(90deg, #ecfeff, #67e8f9, #c4b5fd);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 34px rgba(34, 211, 238, 0.28);
}

.readiness-ring {
  filter: drop-shadow(0 0 30px rgba(34, 211, 238, 0.32));
}

.domain-item,
.task-list li,
.option,
.pbq-task,
.note-card,
.progress-row,
.flashcard-stat,
.lab-step,
.answer-review,
.history-item {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.055);
  box-shadow: inset 0 1px rgba(255, 255, 255, 0.045);
}

.option,
.pbq-task,
.flashcard {
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease, box-shadow 180ms ease;
}

.option:hover,
.pbq-task:hover,
.flashcard:hover {
  transform: translateY(-2px);
  border-color: rgba(34, 211, 238, 0.4);
  background: rgba(34, 211, 238, 0.1);
  box-shadow: var(--glow);
}

.option.selected,
.pbq-task.selected,
.confidence-btn.active {
  border-color: rgba(34, 211, 238, 0.65);
  background: rgba(34, 211, 238, 0.14);
}

.correct,
.option.correct {
  border-color: rgba(52, 211, 153, 0.6) !important;
  background: rgba(52, 211, 153, 0.13) !important;
}

.incorrect,
.option.incorrect {
  border-color: rgba(251, 113, 133, 0.58) !important;
  background: rgba(251, 113, 133, 0.13) !important;
}

.progress-fill,
.domain-progress-fill,
.readiness-fill,
.score-bar-fill {
  background: linear-gradient(90deg, var(--teal), #60a5fa, var(--violet));
  box-shadow: 0 0 22px rgba(34, 211, 238, 0.32);
}

.network-visual {
  border-radius: 24px;
  background:
    linear-gradient(90deg, rgba(34, 211, 238, 0.08) 1px, transparent 1px),
    linear-gradient(rgba(34, 211, 238, 0.08) 1px, transparent 1px),
    radial-gradient(circle at center, rgba(34, 211, 238, 0.14), transparent 70%);
  background-size: 28px 28px, 28px 28px, auto;
}

.node {
  box-shadow: 0 0 0 8px rgba(34, 211, 238, 0.12), 0 0 28px rgba(34, 211, 238, 0.45);
}

input,
select,
textarea {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.065);
  color: var(--ink);
  box-shadow: inset 0 1px rgba(255, 255, 255, 0.04);
}

input:focus,
select:focus,
textarea:focus {
  border-color: rgba(34, 211, 238, 0.55);
  box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.12);
  outline: none;
}

.mobile-topbar {
  border-radius: 0 0 24px 24px;
}

@media (max-width: 920px) {
  .main-content {
    padding: 88px 18px 24px;
  }

  .page-header {
    padding: 22px;
    border-radius: 26px;
  }

  .sidebar {
    border-radius: 0 24px 24px 0;
  }
}