/*
 * Expansion and Mission Control layer
 * -----------------------------------
 * This file styles the complete atlas additions and the shared exploratory
 * lesson template used by the extended subject collection.  It intentionally
 * sits after app.css and module.css so the original pilot lessons remain
 * intact while every generated module receives the same polished shell.
 */

/* Theme inspired by the user's navy / lime / yellow / cyan lesson design. */
html[data-theme="mission"] {
  --bg: #081020;
  --bg-2: #0d1730;
  --panel: #182747;
  --panel-2: #22375d;
  --text: #f8fbff;
  --muted: #c9d8ef;
  --soft: #eaf3ff;
  --accent: #ffe548;
  --accent-2: #b6ff4f;
  --accent-3: #91e6ff;
  --accent-4: #ff9bd2;
  --danger: #ff8ea8;
  --success: #b6ff4f;
  --line: rgba(205, 224, 255, 0.18);
  --line-strong: rgba(205, 224, 255, 0.34);
  --glass: rgba(109, 148, 207, 0.10);
  --glass-strong: rgba(109, 148, 207, 0.16);
  --header-bg: rgba(8, 16, 32, 0.92);
  --shadow: 0 26px 76px rgba(0, 0, 0, 0.38);
  --shadow-soft: 0 18px 48px rgba(0, 0, 0, 0.24);
  --body-gradient:
    radial-gradient(circle at 15% -6%, rgba(145, 230, 255, 0.13), transparent 34%),
    radial-gradient(circle at 92% 12%, rgba(182, 255, 79, 0.09), transparent 34%),
    linear-gradient(145deg, #081020 0%, #0c1428 46%, #070d1b 100%);
}

html[data-theme="mission"] h2 {
  color: var(--accent-2);
}

html[data-theme="mission"] :is(.featured-card, .subject-card, .mission-steps article, .reasoning-grid article, .concept-grid article, .application-grid article) h3 {
  color: var(--accent);
}

html[data-theme="mission"] .button-primary {
  border-color: color-mix(in srgb, var(--accent-3) 80%, white 20%);
  background: var(--accent-3);
  color: #06111f;
  box-shadow: 0 14px 34px rgba(145, 230, 255, 0.22);
}

html[data-theme="mission"] :is(.path-card, .subject-card, .featured-card, .mission-steps article, .concept-grid article, .application-grid article) {
  background:
    radial-gradient(circle at 100% 100%, rgba(255, 229, 72, 0.07) 0 22%, transparent 22.4%),
    linear-gradient(145deg, #20365c, #172846);
  border-color: rgba(145, 180, 228, 0.28);
}

html[data-theme="mission"] .mission-banner,
html[data-theme="mission"] .lesson-ending,
html[data-theme="mission"] .definition-card,
html[data-theme="mission"] .theorem-card,
html[data-theme="mission"] .assessment-card,
html[data-theme="mission"] .lab-shell {
  background: linear-gradient(145deg, #1d2a4e, #151f3b);
}

html[data-theme="mission"] .mission-equation,
html[data-theme="mission"] :is(.hero-formula, .mini-formula, .journey-formula, .theorem-formula, .definition-expression) {
  color: var(--accent-3);
}

html[data-theme="mission"] .mission-equation {
  border-color: var(--accent);
  border-style: dashed;
}

html[data-theme="mission"] .mission-topic-chips button,
html[data-theme="mission"] .lesson-rail a {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(255, 255, 255, 0.20);
}

/* Homepage additions */
.free-badge {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0.42rem 0.72rem;
  border: 1px solid color-mix(in srgb, var(--accent-2) 42%, var(--line));
  border-radius: 999px;
  color: var(--accent-2);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.explorer-hero {
  position: relative;
}

.explorer-hero::before {
  position: absolute;
  top: 7%;
  left: 46%;
  width: 240px;
  height: 240px;
  border: 1px solid color-mix(in srgb, var(--accent-2) 14%, transparent);
  border-radius: 50%;
  content: "";
  pointer-events: none;
}

.node-ai {
  right: 50%;
  bottom: 6%;
  transform: translateX(50%);
}

.node-ai:hover {
  transform: translateX(50%) translateY(-2px);
}

.mission-section {
  position: relative;
}

.mission-banner {
  position: relative;
  display: grid;
  gap: 1rem;
  overflow: hidden;
  padding: clamp(1.35rem, 3vw, 2rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(circle at 95% 85%, color-mix(in srgb, var(--accent) 9%, transparent) 0 78px, transparent 79px),
    linear-gradient(145deg, var(--glass-strong), color-mix(in srgb, var(--panel) 48%, transparent));
  box-shadow: var(--shadow-soft);
}

.mission-banner h2 {
  font-size: clamp(2rem, 4vw, 3.45rem);
}

.mission-banner p:not(.eyebrow) {
  max-width: 930px;
  color: var(--soft);
}

.mission-equation {
  display: flex;
  min-height: 58px;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.8rem;
  padding: 0.9rem 1rem;
  border: 1px dashed color-mix(in srgb, var(--accent) 80%, var(--line));
  border-radius: 18px;
  background: color-mix(in srgb, var(--bg) 48%, transparent);
  color: var(--accent-3);
  font-family: var(--display-font);
  font-size: clamp(1.05rem, 2.2vw, 1.48rem);
  text-align: center;
}

.mission-equation span {
  color: var(--accent-2);
  font-family: var(--body-font);
  font-weight: 900;
}

.mission-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
  margin-top: 1rem;
}

.mission-steps article {
  min-width: 0;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: linear-gradient(145deg, var(--glass-strong), color-mix(in srgb, var(--panel) 44%, transparent));
}

.mission-steps article > span {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  margin-bottom: 0.65rem;
  border: 1px solid color-mix(in srgb, var(--accent-2) 40%, var(--line));
  border-radius: 13px;
  background: color-mix(in srgb, var(--accent-2) 10%, transparent);
  color: var(--accent-2);
  font-weight: 900;
}

.mission-steps h3 {
  color: var(--accent);
  font-family: var(--body-font);
}

.mission-steps p {
  margin: 0;
  color: var(--muted);
}

.mission-topic-chips {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 0.9rem;
}

.mission-topic-chips button {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  gap: 0.4rem;
  padding: 0.54rem 0.78rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--glass);
  color: var(--text);
  cursor: pointer;
  font-weight: 800;
}

.mission-topic-chips button:hover {
  border-color: var(--accent-3);
  transform: translateY(-1px);
}

.mission-topic-chips span {
  color: var(--accent-3);
}

.featured-section {
  position: relative;
}

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

.featured-card {
  position: relative;
  display: flex;
  min-height: 280px;
  flex-direction: column;
  overflow: hidden;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(145deg, var(--glass-strong), color-mix(in srgb, var(--panel) 42%, transparent));
  box-shadow: var(--shadow-soft);
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.featured-card::after {
  position: absolute;
  right: -40px;
  bottom: -48px;
  width: 150px;
  height: 150px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: color-mix(in srgb, var(--accent-3) 8%, transparent);
  content: "";
}

.featured-card:hover {
  border-color: color-mix(in srgb, var(--accent-3) 55%, var(--line));
  transform: translateY(-5px);
}

.featured-icon,
.subject-icon {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  margin-bottom: 0.75rem;
  border: 1px solid color-mix(in srgb, var(--accent-3) 32%, var(--line));
  border-radius: 15px;
  background: color-mix(in srgb, var(--accent-3) 11%, transparent);
  color: var(--accent-3);
  font-size: 1.35rem;
  font-weight: 900;
}

.featured-card h3 {
  margin-top: 0.5rem;
  font-family: var(--body-font);
  font-size: 1.55rem;
}

.featured-card p {
  color: var(--muted);
}

.featured-card b {
  position: relative;
  z-index: 1;
  margin-top: auto;
  color: var(--accent);
}

.path-section,
.atlas-section,
.philosophy-section {
  position: relative;
}

.path-card-ai {
  grid-column: span 3;
}

.atlas-heading {
  scroll-margin-top: 150px;
}

.clear-button {
  flex: 0 0 auto;
}

.category-filters button {
  display: inline-flex;
  align-items: center;
  gap: 0.38rem;
}

.category-filters button span {
  color: var(--accent-3);
  font-weight: 900;
}

.category-filters button small {
  color: inherit;
  opacity: 0.72;
}

.subject-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem;
}

.subject-card .subject-icon {
  width: 42px;
  height: 42px;
  margin: 0;
  border-radius: 13px;
  font-size: 1rem;
}

.subject-question {
  color: var(--soft) !important;
  font-weight: 750;
}

.load-more-row {
  display: flex;
  justify-content: center;
  margin-top: 1.25rem;
}

.site-footer .footer-inner > div:last-child {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-footer .footer-inner > div:last-child a:hover {
  color: var(--accent);
}

/* Shared extended-module presentation */
.journey-page {
  --journey-section-max: 1020px;
}

.journey-hero .lesson-hero-grid {
  align-items: stretch;
}

.journey-topic-art {
  align-content: center;
  padding: 1rem;
}

.topic-orbit {
  position: absolute;
  border: 1px solid color-mix(in srgb, var(--accent-3) 25%, transparent);
  border-radius: 50%;
  pointer-events: none;
}

.topic-orbit-a {
  width: 82%;
  height: 82%;
  transform: rotate(17deg);
}

.topic-orbit-b {
  width: 54%;
  height: 92%;
  transform: rotate(-34deg);
}

.journey-topic-art .hero-topic-symbol {
  width: 148px;
  height: 148px;
  border-radius: 30px;
  font-family: var(--body-font);
  font-size: clamp(2.8rem, 7vw, 5.4rem);
}

.hero-formula {
  position: absolute;
  right: 1rem;
  bottom: 5.4rem;
  left: 1rem;
  z-index: 3;
  max-width: calc(100% - 2rem);
  padding: 0.55rem 0.7rem;
  overflow-x: auto;
  color: var(--accent-3);
  font-size: clamp(0.96rem, 2vw, 1.18rem);
  text-align: center;
  scrollbar-width: thin;
}

.journey-topic-art .art-caption {
  bottom: 0.95rem;
  padding: 0.35rem 0.5rem;
  border-radius: 12px;
  background: color-mix(in srgb, var(--bg) 62%, transparent);
  backdrop-filter: blur(8px);
}

.journey-mystery-card {
  position: relative;
  overflow: hidden;
  min-height: 280px;
  align-self: stretch;
  background:
    radial-gradient(circle at 90% 10%, color-mix(in srgb, var(--accent-3) 10%, transparent), transparent 42%),
    linear-gradient(145deg, var(--glass-strong), color-mix(in srgb, var(--panel) 48%, transparent));
}

.mystery-card-icon {
  display: grid;
  width: 64px;
  height: 64px;
  place-items: center;
  margin-bottom: 1rem;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: color-mix(in srgb, var(--accent-3) 12%, transparent);
  color: var(--accent-3);
  font-size: 2rem;
}

.mini-formula,
.theorem-formula,
.journey-formula {
  max-width: 100%;
  overflow-x: auto;
  color: var(--accent-3);
  font-size: clamp(1rem, 2.4vw, 1.45rem);
  text-align: center;
  scrollbar-width: thin;
}

.mini-formula {
  margin-top: 1.1rem;
  padding: 0.8rem;
  border: 1px dashed color-mix(in srgb, var(--accent) 55%, var(--line));
  border-radius: 16px;
  background: color-mix(in srgb, var(--bg) 42%, transparent);
}

.journey-canvas-wrap {
  min-height: 390px;
}

.journey-canvas-wrap canvas {
  touch-action: pan-y;
}

.canvas-caption {
  margin: 0.65rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.journey-scenario-buttons {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.5rem;
  margin-top: 0.85rem;
}

.journey-scenario-buttons button {
  display: grid;
  min-width: 0;
  min-height: 68px;
  grid-template-columns: 30px minmax(0, 1fr);
  align-items: center;
  gap: 0.45rem;
  padding: 0.65rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--glass);
  color: var(--text);
  cursor: pointer;
  text-align: left;
}

.journey-scenario-buttons button span {
  display: grid;
  width: 29px;
  height: 29px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--accent-2);
  font-weight: 900;
}

.journey-scenario-buttons button:hover,
.journey-scenario-buttons button.active,
.journey-scenario-buttons button[aria-pressed="true"] {
  border-color: var(--accent-3);
  background: color-mix(in srgb, var(--accent-3) 10%, transparent);
}

.journey-range {
  margin: 1rem 0;
  padding: 0.9rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--glass);
}

.journey-range output {
  justify-self: end;
  padding: 0.15rem 0.45rem;
  border-radius: 8px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--accent);
  font-weight: 900;
}

.journey-readout {
  min-height: 190px;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 20px;
  background:
    radial-gradient(circle at 100% 0%, color-mix(in srgb, var(--accent-2) 9%, transparent), transparent 44%),
    color-mix(in srgb, var(--panel) 70%, transparent);
}

.journey-readout-label {
  color: var(--accent-2);
  font-size: 0.75rem;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.journey-readout h3 {
  margin-top: 0.5rem;
  color: var(--accent);
  font-family: var(--body-font);
}

.journey-readout p {
  color: var(--muted);
}

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

.reasoning-grid article {
  padding: 1.05rem;
  border: 1px solid var(--line);
  border-radius: 21px;
  background: linear-gradient(145deg, var(--glass-strong), color-mix(in srgb, var(--panel) 42%, transparent));
}

.reasoning-grid article > span {
  display: grid;
  width: 39px;
  height: 39px;
  place-items: center;
  margin-bottom: 0.7rem;
  border: 1px solid color-mix(in srgb, var(--accent-2) 40%, var(--line));
  border-radius: 12px;
  color: var(--accent-2);
  font-weight: 900;
}

.reasoning-grid p {
  color: var(--muted);
}

.reasoning-conclusion,
.proof-conclusion,
.wide-note {
  margin-top: 1rem;
  padding: 1rem 1.1rem;
  border-left: 4px solid var(--accent-3);
  border-radius: 0 17px 17px 0;
  background: color-mix(in srgb, var(--accent-3) 8%, transparent);
}

.reasoning-conclusion > span,
.proof-conclusion > span {
  color: var(--accent-2);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.reasoning-conclusion p,
.proof-conclusion p,
.wide-note p {
  margin: 0.35rem 0 0;
  color: var(--muted);
}

.theorem-formula {
  margin: 0.9rem 0;
  padding: 0.65rem;
  border: 1px dashed var(--line-strong);
  border-radius: 14px;
  background: color-mix(in srgb, var(--bg) 38%, transparent);
}

.lab-controls-column,
.lab-stage-column,
.challenge-copy {
  min-width: 0;
}

.algebra-hero,
.challenge-section,
.composition-section,
.noncommutative-section,
.theorem-section,
.connections-section,
.lab-section {
  position: relative;
}

/* A thin reading marker helps long modules feel navigable without storing data. */
.reading-progress {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 180;
  height: 3px;
  pointer-events: none;
  background: transparent;
}

.reading-progress > span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--accent-3), var(--accent-2), var(--accent));
  box-shadow: 0 0 12px color-mix(in srgb, var(--accent-3) 45%, transparent);
}

/* Textbook and minimal styles also influence the extension layer. */
html[data-style="textbook"] :is(.mission-banner, .featured-card, .mission-steps article, .journey-readout, .reasoning-grid article) {
  border-radius: var(--radius);
}

html[data-style="minimal"] :is(.mission-banner, .featured-card, .mission-steps article, .journey-readout, .reasoning-grid article) {
  background: var(--panel);
  box-shadow: none;
}


.journey-title.hero-title-compact {
  font-size: clamp(2.35rem, 4.8vw, 4.7rem);
  line-height: 0.98;
}

@media (max-width: 1040px) {
  .featured-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .path-card-ai {
    grid-column: span 2;
  }

  .journey-scenario-buttons {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 760px) {
  .journey-title.hero-title-compact {
    font-size: clamp(2.05rem, 10vw, 3.25rem);
    line-height: 1.02;
  }

  .free-badge {
    display: none;
  }

  .mission-steps,
  .featured-grid {
    grid-template-columns: 1fr;
  }

  .path-card-ai {
    grid-column: auto;
  }

  .mission-topic-chips {
    justify-content: flex-start;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 0.4rem;
    scrollbar-width: thin;
  }

  .mission-topic-chips button {
    flex: 0 0 auto;
  }

  .node-ai {
    right: 50%;
    bottom: 4%;
  }

  .journey-topic-art .hero-topic-symbol {
    width: 125px;
    height: 125px;
  }

  .hero-formula {
    bottom: 4.5rem;
    font-size: 0.95rem;
  }

  .journey-canvas-wrap,
  .journey-canvas-wrap canvas {
    min-height: 315px;
  }

  .mission-equation {
    justify-content: flex-start;
    overflow-x: auto;
    white-space: nowrap;
  }
}

@media (max-width: 520px) {
  .mission-banner,
  .featured-card,
  .journey-mystery-card,
  .reasoning-grid article {
    border-radius: 18px;
  }

  .mission-banner {
    padding: 1rem;
  }

  .featured-card {
    min-height: 245px;
  }

  .journey-scenario-buttons button {
    min-height: 58px;
  }

  .hero-formula {
    right: 0.6rem;
    left: 0.6rem;
    max-width: calc(100% - 1.2rem);
  }
}

/* Hard guard against decorative elements producing a horizontal page scroll. */
html,
body {
  max-width: 100%;
  overflow-x: clip;
}

.explorer-hero {
  overflow: clip;
}

.page-glow {
  max-width: 100vw;
}

/* Keep long mathematical expressions inside their own surfaces on narrow screens. */
.module-page main,
.module-page .lesson-copy,
.module-page .proof-steps,
.module-page .proof-steps li,
.module-page .proof-steps p,
.module-page .reasoning-grid,
.module-page .reasoning-grid article,
.module-page .reasoning-grid p {
  min-width: 0;
}

.module-page mjx-container {
  max-width: 100%;
}

.module-page mjx-container[display="true"] {
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: thin;
}

.module-page mjx-assistive-mml {
  max-width: 100% !important;
  overflow: hidden !important;
}

@media (max-width: 520px) {
  .module-page main {
    overflow-x: clip;
  }
}

/* Privacy and supporting information pages */
.info-page {
  background: var(--body-gradient);
}

.info-hero {
  padding: clamp(5.5rem, 10vw, 8rem) 0 clamp(2.5rem, 6vw, 4.5rem);
}

.info-hero h1 {
  max-width: 920px;
  margin-top: 0.7rem;
  font-size: clamp(3rem, 7vw, 6.8rem);
  line-height: 0.93;
}

.info-hero .hero-lede {
  max-width: 850px;
  margin-top: 1.4rem;
}

.info-section {
  padding-top: clamp(2rem, 5vw, 4rem);
}

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

.info-card {
  min-width: 0;
  padding: clamp(1.2rem, 3vw, 1.8rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(145deg, var(--glass-strong), color-mix(in srgb, var(--panel) 54%, transparent));
  box-shadow: var(--shadow-soft);
}

.info-card-featured {
  background:
    radial-gradient(circle at 100% 100%, color-mix(in srgb, var(--accent-3) 10%, transparent) 0 24%, transparent 24.5%),
    linear-gradient(145deg, var(--glass-strong), color-mix(in srgb, var(--panel) 54%, transparent));
}

.info-number {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  margin-bottom: 0.9rem;
  border: 1px solid color-mix(in srgb, var(--accent-2) 42%, var(--line));
  border-radius: 13px;
  color: var(--accent-2);
  font-weight: 900;
}

.info-card h2 {
  color: var(--accent);
  font-family: var(--body-font);
  font-size: clamp(1.45rem, 3vw, 2rem);
}

.info-card p,
.info-callout > p,
.info-future p {
  color: var(--muted);
}

.info-card code {
  overflow-wrap: anywhere;
  color: var(--accent-3);
}

.info-callout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(1rem, 4vw, 3rem);
  align-items: center;
  padding: clamp(1.3rem, 4vw, 2.4rem);
  border: 1px dashed color-mix(in srgb, var(--accent) 72%, var(--line));
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--panel) 72%, transparent);
}

.info-future {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
  padding: clamp(1.3rem, 4vw, 2.4rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(145deg, var(--glass-strong), color-mix(in srgb, var(--panel) 54%, transparent));
}

.info-future > span {
  display: grid;
  width: 58px;
  height: 58px;
  place-items: center;
  border-radius: 18px;
  background: color-mix(in srgb, var(--accent-3) 13%, transparent);
  color: var(--accent-3);
  font-size: 1.7rem;
  font-weight: 900;
}

.info-future .button {
  margin-top: 0.8rem;
}

.module-footer .footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 1rem;
}

@media (max-width: 760px) {
  .info-grid,
  .info-callout {
    grid-template-columns: 1fr;
  }

  .info-hero h1 {
    font-size: clamp(2.7rem, 13vw, 4.7rem);
  }

  .info-future {
    grid-template-columns: 1fr;
  }

  .module-footer .footer-links {
    justify-content: flex-start;
  }
}