/* styles.css */

/* Add custom scrollbar styling at the top of the file */
/* Modern, thin scrollbar styling */
:root {
  --scrollbar-width: 8px;
  --scrollbar-track-color: rgba(20, 20, 20, 0.3);
  --scrollbar-thumb-color: rgba(100, 100, 100, 0.8);
  --scrollbar-thumb-hover-color: rgba(150, 150, 150, 0.9);
}

/* Scrollbar for Webkit browsers (Chrome, Safari, newer Edge) */
::-webkit-scrollbar {
  width: var(--scrollbar-width);
  height: var(--scrollbar-width);
}

::-webkit-scrollbar-track {
  background: var(--scrollbar-track-color);
}

::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover-color);
}

/* Scrollbar for Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb-color) var(--scrollbar-track-color);
}

/* Ensure consistent page width regardless of scrollbar */
html {
  height: 100%;
  overflow-x: hidden !important;
  overflow-y: auto !important;
  margin-right: 0 !important;
}

body {
  min-height: 100%;
  padding-right: var(--scrollbar-width) !important;
  box-sizing: border-box;
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: #f0f0f0;
}
body.lecture-page-active {
  height: 100%;
  overflow: hidden !important;
  padding-right: 0 !important;
}
body.journey-locked {
  overflow: hidden;
}

/* Header Styles */
header {
  position: fixed;
  width: 100%;
  background: transparent;
  top: 0;
  left: 0;
  z-index: 1000;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  gap: 14px;
}

.nav-island {
  display: flex;
  align-items: center;
  background: #101010;
  border-radius: 20px;
  padding: 8px 2px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.42), inset 0 1px 0 rgba(255, 255, 255, 0.08), inset 0 -1px 0 rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-left, .nav-right {
  list-style: none;
  display: flex;
  margin: 0;
  padding: 0;
}

.nav-left li, .nav-right li {
  margin: 0 10px;
}

.nav-folder {
  position: relative;
  z-index: 3200;
}

.folder-button {
  background: linear-gradient(135deg, #2d2f36, #1c1e24);
  color: #ffffff !important;
  border: none;
  border-radius: 12px;
  padding: 8px 18px;
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 4px 0 #121318, 0 12px 24px rgba(0, 0, 0, 0.35);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.folder-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 0 #121318, 0 16px 30px rgba(0, 0, 0, 0.4);
}

.folder-button:active {
  transform: translateY(2px);
  box-shadow: 0 2px 0 #121318, 0 8px 18px rgba(0, 0, 0, 0.3);
}

.folder-panel {
  position: fixed;
  top: var(--folder-top, 64px);
  left: var(--folder-left, 20px);
  min-width: 320px;
  background: linear-gradient(155deg, #131313, #0a0a0a);
  border-radius: 18px;
  padding: 16px 18px;
  box-shadow: 0 18px 32px rgba(0, 0, 0, 0.55), inset 0 1px 0 rgba(255, 255, 255, 0.06), inset 0 -1px 0 rgba(0, 0, 0, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.06);
  z-index: 3300;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-6px) scale(0.97);
  transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s ease;
}

.folder-panel::before {
  content: '';
  position: absolute;
  top: -8px;
  left: var(--folder-arrow-left, 22px);
  width: 16px;
  height: 16px;
  background: linear-gradient(135deg, #131313, #0a0a0a);
  transform: rotate(45deg);
  border-left: 1px solid rgba(255, 255, 255, 0.06);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.nav-folder.open .folder-panel {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

.app-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(96px, 1fr));
  gap: 16px;
}

.app-tile {
  background: transparent;
  border: none;
  padding: 4px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  color: #eaeaf1;
  text-decoration: none;
  transition: transform 0.18s ease, filter 0.18s ease;
}

.app-tile:hover {
  transform: none;
  filter: none;
}

.app-tile:active {
  transform: translateY(2px);
}

.app-icon {
  width: 76px;
  height: 76px;
  border-radius: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 14px 24px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  position: relative;
  transition: box-shadow 0.18s ease, filter 0.18s ease;
}

.app-glyph {
  font-size: 28px;
  color: #ffffff;
}

.app-label {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.4px;
  color: #d2d6e4;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
  transition: color 0.18s ease;
}

.app-tile:hover .app-icon {
  filter: brightness(1.15) saturate(1.08);
  box-shadow: 0 16px 26px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.12);
}

.app-tile:hover .app-label {
  color: #ffffff;
}

.app-icon-calculator,
.app-icon-graph,
.app-icon-canvas,
.app-icon-converter,
.app-icon-periodic,
.app-icon-standard,
.app-icon-nuclide,
.app-icon-sol,
.app-icon-orbitals {
  background: linear-gradient(145deg, #1c1c1c, #121212);
}


/* Game-like Button Styles - excluding course buttons */
.button, 
header .button,
.subject-header button {
  background: linear-gradient(135deg, #ff8800, #ff6600);
  color: white !important;
  border: none;
  border-radius: 12px;
  padding: 10px 20px;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  box-shadow: 0 4px 0 #cc5500, 0 6px 15px rgba(0, 0, 0, 0.2);
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
  text-transform: uppercase;
  letter-spacing: 1px;
  text-decoration: none;
  display: inline-block;
  text-align: center;
}

/* Course buttons - restore to original with no animations */
.course-button {
  margin: 0 20px;
  text-align: center;
  text-decoration: none;
  color: black;
  position: relative;
  transition: all 0.2s ease;
  display: inline-block;
  cursor: pointer;
}

.course-button img {
  width: 250px;
  height: 400px;
  border-radius: 30px;
  box-shadow: none;
  transition: all 0.2s ease;
  position: relative;
  z-index: 2;
}

/* Create extending shadow effect using pseudo-element */
.course-button::after {
  content: "";
  position: absolute;
  width: 250px;
  height: 400px;
  background-size: 100% 100%;
  border-radius: 30px;
  left: 0;
  top: 4px;
  z-index: 1;
  opacity: 0.5;
  filter: brightness(0.5);
  transition: all 0.2s ease;
}

.course-button:nth-child(1)::after {
  background-image: url('../images/physics.png');
}

.course-button:nth-child(2)::after {
  background-image: url('../images/math.png');
}

.course-button:nth-child(3)::after {
  background-image: url('../images/chemistry.png');
}

/* Add hover effect for course buttons */
.course-button:hover img {
  transform: translateY(-3px);
}

.course-button:hover::after {
  top: 6px;
  opacity: 0.6;
  transform: translateY(-3px);
}

/* Add click effect for course buttons */
.course-button:active img {
  transform: translateY(2px);
}

.course-button:active::after {
  top: 2px;
  opacity: 0.4;
  transform: translateY(2px);
}

.course-button span {
  display: block;
  margin-top: 10px;
  font-size: 18px;
}

/* Responsive adjustments (navigation/home tiles) */
@media screen and (max-width: 768px) {
  nav {
    flex-direction: column;
    align-items: stretch;
  }
  .nav-island {
    width: 100%;
    justify-content: center;
  }
  .course-button img {
    width: 200px;
    height: 150px;
    box-shadow: none;
  }
  .course-button::after {
    width: 200px;
    height: 150px;
  }
  .folder-panel {
    min-width: 260px;
  }
  .app-grid {
    grid-template-columns: repeat(2, minmax(120px, 1fr));
  }
}

/* Adjust header buttons */
header .nav-left .button,
header .nav-right .button {
  margin: 0 5px;
  padding: 8px 15px;
  font-size: 14px;
}

/* Hide inline lecture header title */
#inline-lecture-title {
  display: none;
}

/* Hide the navigation right section initially */
.nav-right {
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

/* Reveal the navigation right section when 'visible' class is added */
.nav-right.visible {
  visibility: visible;
  opacity: 1;
}

/* Main Content Styles */
main {
  margin-top: 80px; /* Adjust if header height changes */
  padding: 20px;
}

.home-main {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  min-height: calc(100vh - 120px); /* fills viewport without extra scroll */
  box-sizing: border-box;
  margin-top: 0; /* override default main margin */
  padding: 120px 20px 40px 20px; /* spacing from header without adding extra height */
}

/* Home Page Styles */
/* Course Selection Styles */
.update-notice {
  width: min(92vw, 950px);
  margin: 0 auto 28px;
  padding: 14px 18px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(10, 10, 14, 0.8);
  color: #e6e6ea;
  text-align: center;
  font-weight: 600;
  line-height: 1.5;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.35);
}

.update-notice strong {
  color: #ff8800;
}

.course-selection {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  margin-top: 120px; /* push buttons away from header */
}
.home-main .course-selection {
  margin-top: 0; /* use flex centering instead */
}

.course-button {
  margin: 0 20px;
  text-align: center;
  text-decoration: none;
  color: black;
  position: relative;
  transition: all 0.2s ease;
  display: inline-block;
  cursor: pointer;
}

.course-button span {
  display: block;
  margin-top: 10px;
  font-size: 18px;
}

/* Wide Picture Styles */
.wide-picture img {
  width: 100%;
  height: auto;
  margin-top: 50px;
}

/* Inline course view */
.course-selection,
.wide-picture {
  transition: opacity 0.35s ease;
}

.is-fading-out {
  opacity: 0;
  pointer-events: none;
}

.is-hidden {
  display: none !important;
}

.course-view {
  display: none;
  opacity: 0;
  transition: opacity 0.35s ease;
  max-width: 1100px;
  margin: 0 auto;
  padding: 10px 20px 40px 20px;
  box-sizing: border-box;
}

.course-view.active {
  display: block;
}

.course-view.ready {
  opacity: 1;
}

.course-back {
  position: fixed;
  top: 90px;
  left: 20px;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: #121212;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.35);
  z-index: 1200;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background-color 0.25s ease, border-color 0.25s ease;
}

.course-back::before {
  content: '';
  display: block;
  width: 10px;
  height: 10px;
  border-left: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  margin-left: 4px;
}

.course-back:hover {
  background: #1a1a1a;
  border-color: rgba(255, 255, 255, 0.2);
}

.course-back:active {
  transform: scale(1.08);
  background: #222;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
}

.course-content-shell,
.lecture-view {
  transition: opacity 0.35s ease;
}

.course-content-shell {
  padding-top: 110px; /* push course category buttons down without affecting lecture view */
  box-sizing: border-box;
}

.lecture-view {
  display: none;
  opacity: 0;
}

.lecture-view.active {
  display: block;
}

.lecture-view.ready {
  opacity: 1;
}

/* Regular buttons - NO hover animations */
.button:hover, 
header .button:hover,
.subject-header button:hover {
  /* Restore hover animations */
  transform: translateY(-3px);
  box-shadow: 0 6px 0 #cc5500, 0 8px 20px rgba(0, 0, 0, 0.3);
}

/* Keep only click animation */
.button:active, 
header .button:active,
.subject-header button:active {
  /* Restore active animations */
  transform: translateY(2px);
  box-shadow: 0 2px 0 #cc5500, 0 4px 8px rgba(0, 0, 0, 0.2);
}

/* Onboarding hint icon */
.journey-hint-button {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: #121212;
  color: #ffffff;
  font-weight: 800;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: -1px;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.35);
  transition: transform 0.25s ease, box-shadow 0.25s ease, background-color 0.25s ease, border-color 0.25s ease;
  will-change: transform;
}

.journey-hint-button:hover {
  background: #1a1a1a;
  border-color: rgba(255, 255, 255, 0.2);
}

.journey-hint-button:active {
  transform: scale(1.08);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
  background: #222;
}

/* Journey overlay: dark backdrop and a single glassy line */
.journey-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.86);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s ease, visibility 0.35s ease;
  z-index: 2500;
  padding: 24px;
}

.journey-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.journey-sequence {
  position: relative;
  width: min(1000px, 94vw);
}

.journey-track {
  position: relative;
  width: 100%;
  height: 18px;
  background: rgba(0, 0, 0, 0.28);
  border: 2px solid #ffffff;
  border-radius: 20px;
  overflow: visible; /* allow the large icons and text to sit above the line */
}

.journey-fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0%;
  background: #ff9100;
  transition: width 0.42s ease-in;
}

.journey-step {
  position: absolute;
  top: 50%;
  transform: translate(calc(-50% + var(--step-shift, 0%)), -50%); /* allow slight per-step nudging */
  text-align: center;
  z-index: 2;
}

.journey-step[data-step="earth"] {
  left: 0%;
  --step-shift: 20%;
}

.journey-step[data-step="exoplanet"] {
  left: 50%;
  --step-shift: 0%;
}

.journey-step[data-step="blackhole"] {
  left: 100%;
  --step-shift: -20%;
}

.journey-step img {
  width: 180px;
  height: 180px;
  object-fit: contain;
  display: block;
  margin-bottom: 12px;
  filter: brightness(0.1) saturate(0.45);
  opacity: 0.55;
  transform: scale(var(--step-scale, 1));
  transform-origin: center;
  transition: filter 0.28s ease, opacity 0.28s ease, transform 0.28s ease;
}

.journey-step.is-lit img {
  filter: brightness(1) saturate(1);
  opacity: 1;
  transform: scale(calc(var(--step-scale, 1) + var(--step-scale-bump, 0.08)));
}

.journey-step[data-step="earth"] img {
  --step-scale: 1.3;
}

.journey-step[data-step="exoplanet"] img {
  --step-scale: 2;
}

.journey-step[data-step="blackhole"] img {
  --step-scale: 1.8;
}

.journey-callout {
  position: absolute;
  bottom: 120%;
  left: 50%;
  transform: translate(-50%, 12px);
  background: #000000;
  border: 2px solid #1fd4d4;
  color: #e5f4ff;
  padding: 10px 14px;
  border-radius: 12px;
  min-width: 240px;
  max-width: 280px;
  font-weight: 800;
  font-size: 14px;
  line-height: 1.4;
  opacity: 0;
  transition: opacity 0.28s ease, transform 0.28s ease;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.35);
  pointer-events: none;
}

.journey-step.is-shown .journey-callout {
  opacity: 1;
  transform: translate(-50%, -6px);
}

@media screen and (max-width: 768px) {
  .journey-sequence {
    width: 100%;
  }

  .journey-track {
    height: 22px;
  }

  .journey-step img {
    width: 150px;
    height: 150px;
  }

  .journey-step[data-step="earth"] {
    left: 14%;
  }

  .journey-step[data-step="blackhole"] {
    left: 86%;
  }

  .journey-callout {
    min-width: 210px;
    max-width: 240px;
    font-size: 13px;
  }
}