:root {
  --bg: #f4ede3;
  --bg-alt: #efe2d2;
  --panel: rgba(255, 250, 242, 0.8);
  --panel-strong: rgba(255, 248, 238, 0.95);
  --line: rgba(33, 46, 38, 0.12);
  --ink: #18261f;
  --muted: #617266;
  --accent: #0d796d;
  --accent-soft: rgba(13, 121, 109, 0.14);
  --accent-strong: #095950;
  --warm: #db6f4f;
  --warm-soft: rgba(219, 111, 79, 0.16);
  --gold: #c79c3a;
  --success: #2e8354;
  --warning: #bd7b1a;
  --danger: #b14c43;
  --shadow: 0 24px 60px rgba(52, 43, 25, 0.12);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 12px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Aptos", "Trebuchet MS", "Segoe UI", sans-serif;
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(219, 111, 79, 0.18), transparent 28rem),
    radial-gradient(circle at 85% 0%, rgba(13, 121, 109, 0.18), transparent 26rem),
    linear-gradient(180deg, #f7f1e8 0%, #f1e6d7 100%);
}

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

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

.page-noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
  background-size: 22px 22px;
  mask-image: radial-gradient(circle at center, black 55%, transparent 100%);
  opacity: 0.45;
}

.app-shell {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(244, 237, 227, 0.94);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(33, 46, 38, 0.1);
  padding: 0.6rem 1.5rem;
}

.app-header .topbar {
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
}

.tab-content {
  flex: 1;
  overflow-y: auto;
  padding: 1.8rem 0 3rem;
}

.tab-panel {
  width: min(1280px, calc(100% - 2rem));
  margin: 0 auto;
  display: grid;
  gap: 2rem;
  animation: riseIn 280ms ease both;
}

.tab-panel.hidden {
  display: none;
}

.tab-panel .hero-grid {
  margin-top: 0;
}

.bottom-nav {
  display: none;
}

.bnav-btn {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.18rem;
  padding: 0.4rem 0.6rem;
  min-width: 3rem;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 0.62rem;
  font-weight: 500;
  cursor: pointer;
  transition: color 160ms ease;
}

.bnav-btn svg {
  width: 1.4rem;
  height: 1.4rem;
  stroke-width: 1.8;
}

.bnav-btn.is-active {
  color: var(--accent);
}

.bnav-btn .tab-badge {
  position: absolute;
  top: 0.1rem;
  left: calc(50% + 0.2rem);
}

.hero,
.panel {
  background: var(--panel);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(255, 255, 255, 0.55);
  box-shadow: var(--shadow);
}

.hero {
  border-radius: 36px;
  padding: 2rem;
  overflow: hidden;
}

.topbar,
.section-head,
.review-toolbar,
.status-row,
.subpanel-head,
.quiz-toolbar,
.timer-actions,
.hero-panel-grid,
.form-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.subpanel-head {
  margin-bottom: 1rem;
}

.section-head {
  margin-bottom: 1.5rem;
}

.status-row {
  flex-wrap: wrap;
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand-mark {
  width: 3.2rem;
  height: 3.2rem;
  display: grid;
  place-items: center;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #fff;
  font-size: 1.4rem;
  font-weight: 700;
}

.eyebrow {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: "Georgia", "Times New Roman", serif;
  font-weight: 700;
  line-height: 1.05;
}

h1 {
  font-size: clamp(1.6rem, 2.4vw, 2.2rem);
}

h2 {
  font-size: clamp(1.7rem, 2.8vw, 2.5rem);
  max-width: 11ch;
  margin-top: 0.5rem;
  line-height: 1.15;
}

h3 {
  font-size: clamp(1.1rem, 1.5vw, 1.55rem);
}

h4 {
  font-size: 1rem;
}

.tab-nav {
  display: flex;
  gap: 0.2rem;
  align-items: center;
  overflow-x: auto;
  scrollbar-width: none;
}

.tab-nav::-webkit-scrollbar {
  display: none;
}

.tab-btn,
.pill-button,
.button {
  border: 0;
  cursor: pointer;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease, color 180ms ease;
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 500;
  white-space: nowrap;
}

.tab-btn.is-active {
  background: var(--accent);
  color: #fff;
}

.tab-btn:hover:not(.is-active) {
  background: rgba(13, 121, 109, 0.1);
  color: var(--ink);
}

.tab-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.15rem;
  height: 1.15rem;
  padding: 0 0.25rem;
  border-radius: 999px;
  background: var(--warm);
  color: #fff;
  font-size: 0.62rem;
  font-weight: 700;
  line-height: 1;
}

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

.hero-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.9fr;
  gap: 2rem;
  margin-top: 2rem;
}

.hero-copy {
  padding: clamp(1rem, 2vw, 2rem);
}

.hero-text {
  max-width: 58ch;
  margin: 1.25rem 0 0;
  font-size: 0.98rem;
  color: var(--muted);
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 1.75rem;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.6rem;
}

.hero-tags span,
.stack-badge,
.section-note {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  font-size: 0.82rem;
  color: var(--accent-strong);
  background: rgba(255, 255, 255, 0.72);
}

.section-note {
  color: var(--muted);
}

.hero-panel {
  padding: 1.6rem;
  border-radius: 28px;
  position: relative;
}

.glow-panel::before {
  content: "";
  position: absolute;
  inset: -20% 35% 50% -20%;
  background: radial-gradient(circle, rgba(199, 156, 58, 0.26), transparent 70%);
  pointer-events: none;
}

.ring-card {
  display: flex;
  justify-content: center;
  padding: 1rem 0 1.4rem;
}

.progress-ring {
  --progress: 35%;
  width: 12rem;
  aspect-ratio: 1;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at center, rgba(255, 248, 238, 1) 0 54%, transparent 55%),
    conic-gradient(var(--accent) 0 var(--progress), rgba(24, 38, 31, 0.08) var(--progress) 100%);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.7);
}

.timer-ring {
  width: min(16rem, 100%);
  margin: 0 auto 1.25rem;
}

.progress-ring__center {
  display: grid;
  place-items: center;
  gap: 0.2rem;
  text-align: center;
}

.progress-ring__center strong {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
}

.progress-ring__center span {
  color: var(--muted);
  font-size: 0.88rem;
}

.mini-metric,
.metric-card,
.subpanel,
.stack-form,
.review-station,
.quiz-card,
.quiz-summary,
.timer-card,
.study-summary,
.goal-summary,
.goal-item,
.library-item {
  border-radius: var(--radius-lg);
  background: var(--panel-strong);
  border: 1px solid var(--line);
}

.hero-panel-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.mini-metric {
  padding: 1.15rem;
}

.mini-metric span {
  display: block;
  font-size: 1.15rem;
  font-weight: 700;
}

.mini-metric small,
.helper-text,
.metric-card small,
.subpanel-head span,
.goal-meta,
.library-meta,
.session-meta,
.empty-state {
  color: var(--muted);
}

.hero-insight {
  margin: 1.25rem 0 0;
  line-height: 1.7;
  font-size: 0.9rem;
  color: var(--muted);
}

.content-grid {
  display: grid;
  gap: 2rem;
  margin-top: 2rem;
}

.panel {
  padding: 2rem;
  border-radius: 32px;
}

.panel-wide {
  padding: 2.25rem;
}

.overview-stats {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
}

.overview-stats.compact {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 0;
}

.metric-card {
  padding: 1.4rem;
  display: grid;
  gap: 0.6rem;
}

.metric-card strong {
  font-size: 1.5rem;
}

.metric-label,
.quiz-category {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
  color: var(--muted);
}

.overview-columns,
.module-grid {
  display: grid;
  gap: 1.5rem;
  margin-top: 2rem;
}

.utility-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

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

.module-grid.split {
  grid-template-columns: minmax(18rem, 0.9fr) minmax(22rem, 1.2fr);
}

.subpanel,
.stack-form,
.review-station,
.quiz-card,
.quiz-summary,
.timer-card,
.study-summary,
.goal-summary,
.goal-item,
.library-item {
  padding: 1.6rem;
}

.bars-stack,
.checklist,
.stack-list,
.session-list,
.goal-list,
.revision-advice {
  display: grid;
  gap: 1.25rem;
}

.bar-row {
  display: grid;
  gap: 0.6rem;
}

.bar-caption {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.95rem;
}

.bar-track,
.progress-track,
.goal-progress {
  height: 0.72rem;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(24, 38, 31, 0.08);
}

.bar-track span,
.progress-track span,
.goal-progress span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--warm), var(--accent));
}

.check-item,
.stack-item,
.session-item {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.1rem;
  border-radius: 16px;
  background: rgba(13, 121, 109, 0.06);
}

.check-item strong,
.session-item strong,
.goal-item h4,
.library-item h4 {
  display: block;
  margin-bottom: 0.25rem;
}

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

.mastery-card {
  padding: 1.4rem;
  border-radius: 18px;
  background: rgba(219, 111, 79, 0.08);
}

.mastery-card strong {
  display: block;
  font-size: 1.35rem;
  margin-top: 0.4rem;
}

.stack-form,
.exam-form {
  display: grid;
  gap: 1.4rem;
}

.stack-form > button,
.exam-form > button {
  justify-self: start;
}

.form-actions,
.action-cluster,
.card-actions,
.summary-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.status-inline {
  margin: 0;
  line-height: 1.6;
  color: var(--muted);
}

label {
  display: grid;
  gap: 0.6rem;
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 500;
}

input,
select,
textarea {
  width: 100%;
  padding: 0.9rem 1rem;
  border-radius: 16px;
  border: 1px solid rgba(24, 38, 31, 0.12);
  background: rgba(255, 255, 255, 0.92);
  color: var(--ink);
  resize: vertical;
}

textarea {
  min-height: 7rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  gap: 0.4rem;
  min-height: 0;
  padding: 0.45rem 1rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1.4;
}

.button-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #fff;
  box-shadow: 0 16px 30px rgba(13, 121, 109, 0.22);
}

.button-secondary {
  background: rgba(255, 255, 255, 0.82);
  color: var(--ink);
  border: 1px solid var(--line);
}

.ghost-button {
  background: transparent;
  color: var(--muted);
  border: 1px dashed rgba(24, 38, 31, 0.18);
}

.tone-danger {
  background: rgba(177, 76, 67, 0.12);
  color: var(--danger);
}

.tone-warning {
  background: rgba(189, 123, 26, 0.14);
  color: var(--warning);
}

.tone-success {
  background: rgba(46, 131, 84, 0.14);
  color: var(--success);
}

.tone-calm {
  background: rgba(13, 121, 109, 0.12);
  color: var(--accent);
}

.review-toolbar {
  margin-bottom: 1.5rem;
}

.flip-card {
  perspective: 1400px;
  min-height: 21rem;
  cursor: pointer;
}

.flip-card__inner {
  position: relative;
  width: 100%;
  min-height: 21rem;
  transition: transform 420ms ease;
  transform-style: preserve-3d;
}

.flip-card.is-flipped .flip-card__inner {
  transform: rotateY(180deg);
}

.flip-face {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.25rem;
  padding: 1.6rem;
  border-radius: 24px;
  backface-visibility: hidden;
  background:
    radial-gradient(circle at top right, rgba(199, 156, 58, 0.14), transparent 32%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(253, 247, 238, 0.92));
  border: 1px solid rgba(24, 38, 31, 0.08);
}

.flip-face--back {
  transform: rotateY(180deg);
}

.stack-badge {
  width: fit-content;
  background: rgba(13, 121, 109, 0.12);
}

.stack-badge--secondary {
  color: var(--warm);
  background: rgba(219, 111, 79, 0.12);
}

.review-actions {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}

.stack-list-box,
.library-panel {
  margin-top: 1.5rem;
}

.library-toolbar {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.25rem;
  margin: 1.75rem 0;
}

.stack-item,
.session-item {
  border: 1px solid rgba(24, 38, 31, 0.08);
}

.stack-item button,
.goal-actions button,
.library-item button {
  flex-shrink: 0;
}

.library-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: 1rem;
}

.library-item {
  display: grid;
  gap: 0.8rem;
}

.card-actions .button,
.summary-actions .button {
  padding-inline: 0.8rem;
}

.library-meta,
.session-meta,
.goal-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  font-size: 0.84rem;
}

.quiz-toolbar {
  margin-top: 1.5rem;
  align-items: end;
  flex-wrap: wrap;
}

.quiz-toolbar label {
  flex: 1 1 11rem;
  max-width: none;
}

.quiz-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(18rem, 0.85fr);
  gap: 1.5rem;
  margin-top: 2rem;
}

.quiz-status {
  grid-column: 1 / -1;
}

.progress-track {
  width: 100%;
  height: 0.7rem;
}

.quiz-card {
  display: grid;
  gap: 1.25rem;
}

.quiz-options {
  display: grid;
  gap: 0.9rem;
}

.quiz-option {
  text-align: left;
  padding: 0.95rem 1rem;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(24, 38, 31, 0.1);
  color: var(--ink);
}

.quiz-option.is-correct {
  background: rgba(46, 131, 84, 0.14);
  border-color: rgba(46, 131, 84, 0.28);
}

.quiz-option.is-wrong {
  background: rgba(177, 76, 67, 0.12);
  border-color: rgba(177, 76, 67, 0.28);
}

.quiz-explanation {
  min-height: 3.5rem;
  padding: 1rem 1.25rem;
  border-radius: 18px;
  background: rgba(13, 121, 109, 0.06);
  line-height: 1.7;
}

.quiz-summary {
  display: grid;
  gap: 1rem;
}

.summary-block {
  padding: 1.1rem 1.25rem;
  border-radius: 16px;
  background: rgba(219, 111, 79, 0.08);
}

.summary-block .button {
  margin-top: 0.8rem;
}

.hidden {
  display: none !important;
}

.preset-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.pill-button {
  padding: 0.55rem 0.75rem;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.76);
  font-size: 0.88rem;
}

.pill-button.is-active {
  background: var(--accent);
  color: #fff;
}

.study-summary {
  display: grid;
  gap: 1.5rem;
}

.goal-column {
  display: grid;
  gap: 1.5rem;
}

.goal-summary {
  display: grid;
  gap: 0.85rem;
}

.goal-list {
  margin-top: 0;
}

.goal-item {
  display: grid;
  gap: 0.75rem;
}

.goal-actions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.goal-actions .button,
.stack-item .button,
.library-item .button {
  padding-inline: 0.8rem;
}

.exam-form {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  align-items: end;
  margin-top: 1rem;
}

.accent-panel {
  background:
    radial-gradient(circle at top right, rgba(13, 121, 109, 0.14), transparent 26rem),
    linear-gradient(180deg, rgba(255, 250, 242, 0.92), rgba(252, 246, 238, 0.86));
}

.revision-advice {
  line-height: 1.8;
  font-size: 0.95rem;
}

.reveal {
  animation: riseIn 700ms ease both;
}

@keyframes riseIn {
  from {
    opacity: 0;
    transform: translateY(18px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1120px) {
  .hero-grid,
  .quiz-shell,
  .module-grid.split,
  .overview-columns {
    grid-template-columns: 1fr;
  }

  .utility-grid {
    grid-template-columns: 1fr;
  }

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

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

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

@media (max-width: 1120px) and (min-width: 761px) {
  .tab-nav {
    gap: 0.1rem;
  }

  .tab-btn {
    padding: 0.4rem 0.65rem;
    font-size: 0.8rem;
  }
}

@media (max-width: 760px) {
  /* App header */
  .app-header {
    padding: 0.5rem 1rem;
  }

  .app-header .topbar {
    flex-direction: row;
    align-items: center;
  }

  .app-header .eyebrow {
    display: none;
  }

  .app-header h1 {
    font-size: 1.15rem;
  }

  .brand-mark {
    width: 2.6rem;
    height: 2.6rem;
    font-size: 1.1rem;
    border-radius: 12px;
  }

  /* Hide desktop tabs, show bottom nav */
  .tab-nav {
    display: none;
  }

  .bottom-nav {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 200;
    background: rgba(255, 250, 242, 0.97);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-top: 1px solid rgba(33, 46, 38, 0.1);
    padding: 0.35rem 0 calc(env(safe-area-inset-bottom, 0px) + 0.35rem);
    justify-content: space-around;
  }

  /* Extra padding so content doesn't hide behind bottom nav */
  .tab-content {
    padding-bottom: calc(5.5rem + env(safe-area-inset-bottom, 0px));
  }

  /* Panels */
  .hero,
  .panel,
  .panel-wide {
    border-radius: 24px;
    padding: 1.35rem;
  }

  .section-head,
  .quiz-toolbar,
  .review-toolbar,
  .form-row,
  .timer-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .subpanel-head {
    flex-wrap: wrap;
    gap: 0.25rem;
  }

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

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

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

  .library-toolbar,
  .utility-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
  }

  .flip-card,
  .flip-card__inner {
    min-height: 18rem;
  }
}