/* GeoPath Cambridge – Purple & Yellow Theme */
:root {
  --bg-primary:     #0d0a14;
  --bg-secondary:   #120d1c;
  --bg-card:        #1a1228;
  --bg-card-hover:  #211535;
  --bg-input:       #100b1a;
  --purple-primary: #6a1b9a;
  --purple-light:   #ce93d8;
  --purple-dark:    #4a148c;
  --purple-glow:    rgba(106, 27, 154, 0.25);
  --purple-border:  rgba(106, 27, 154, 0.35);
  --yellow-primary: #f9a825;
  --yellow-light:   #ffd54f;
  --yellow-dark:    #e65100;
  --yellow-glow:    rgba(249, 168, 37, 0.18);
  --text-primary:   #f3e5f5;
  --text-secondary: #a986c0;
  --text-muted:     #4a3560;
  --border-color:   rgba(106, 27, 154, 0.2);
  --success-bg:     rgba(106, 27, 154, 0.2);
  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  16px;
  --radius-xl:  24px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}
a { color: var(--purple-light); text-decoration: none; }
a:hover { color: var(--yellow-light); }

/* ── NAVBAR ─────────────────────────────────────────────────────────────── */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(13, 10, 20, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
}
.nav-inner {
  max-width: 1280px; margin: 0 auto;
  padding: 0 24px; height: 60px;
  display: flex; align-items: center; gap: 24px;
}
.nav-logo {
  display: flex; align-items: center; gap: 8px;
  font-weight: 700; font-size: 1.05rem; color: var(--text-primary);
}
.logo-icon { font-size: 1.4rem; }
.logo-text  { color: var(--purple-light); }
.logo-sub   { color: var(--yellow-light); font-size: 0.75rem; font-weight: 500; margin-left: 2px; }
.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-links a {
  padding: 6px 14px; border-radius: var(--radius-sm);
  color: var(--text-secondary); font-size: 0.9rem; font-weight: 500;
  transition: all 0.2s;
}
.nav-links a:hover { background: var(--purple-glow); color: var(--purple-light); }
.nav-toggle {
  display: none; background: none; border: none;
  color: var(--text-primary); font-size: 1.3rem; cursor: pointer; margin-left: auto;
}
.mobile-menu {
  display: none; flex-direction: column; gap: 4px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 12px 24px;
}
.mobile-menu a { padding: 10px 0; color: var(--text-secondary); font-size: 0.95rem; }
.mobile-menu a:hover { color: var(--purple-light); }
.mobile-menu.open { display: flex; }
@media (max-width: 640px) { .nav-links { display: none; } .nav-toggle { display: block; } }

/* ── MAIN ───────────────────────────────────────────────────────────────── */
.main-content { min-height: calc(100vh - 60px); }

/* ── HERO ───────────────────────────────────────────────────────────────── */
.hero {
  position: relative; overflow: hidden;
  padding: 80px 24px 60px;
  background: radial-gradient(ellipse at 20% 50%, rgba(106,27,154,0.18) 0%, transparent 60%),
              radial-gradient(ellipse at 80% 20%, rgba(249,168,37,0.1) 0%, transparent 50%);
  border-bottom: 1px solid var(--border-color);
}
.hero-inner { max-width: 860px; margin: 0 auto; text-align: center; position: relative; z-index: 1; }
.hero-badge {
  display: inline-block; margin-bottom: 20px;
  padding: 5px 16px; border-radius: 99px;
  background: var(--purple-glow); border: 1px solid var(--purple-border);
  color: var(--purple-light); font-size: 0.82rem; font-weight: 600; letter-spacing: 0.03em;
}
.hero-title { font-size: clamp(2rem,5vw,3.4rem); font-weight: 800; line-height: 1.15; margin-bottom: 16px; }
.hero-accent { color: var(--yellow-light); }
.hero-subtitle { color: var(--text-secondary); font-size: 1.05rem; max-width: 600px; margin: 0 auto 32px; }
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 40px; }
.hero-stats { display: flex; gap: 32px; justify-content: center; flex-wrap: wrap; }
.hero-stat { text-align: center; }
.hero-stat-num { display: block; font-size: 1.8rem; font-weight: 800; color: var(--yellow-light); line-height: 1; }
.hero-stat-label { font-size: 0.78rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; }

/* ── SECTIONS ───────────────────────────────────────────────────────────── */
.section { padding: 56px 24px; }
.section-alt { background: var(--bg-secondary); }
.section-inner { max-width: 1280px; margin: 0 auto; }
.section-title {
  font-size: 1.5rem; font-weight: 700; margin-bottom: 8px;
  display: flex; align-items: center; gap: 10px;
}
.section-title .emoji { font-size: 1.3rem; }
.section-sub { color: var(--text-secondary); margin-bottom: 32px; }

/* ── YEAR CARDS ─────────────────────────────────────────────────────────── */
.year-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 20px; }
.year-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-lg); padding: 28px 24px;
  transition: all 0.25s; display: flex; flex-direction: column; gap: 8px;
}
.year-card:hover { background: var(--bg-card-hover); border-color: var(--purple-primary); transform: translateY(-3px); box-shadow: 0 8px 30px var(--purple-glow); }
.year-emoji  { font-size: 2.4rem; }
.year-name   { font-size: 1.1rem; font-weight: 700; color: var(--text-primary); }
.year-desc   { font-size: 0.85rem; color: var(--text-secondary); flex: 1; }
.year-count  { font-size: 0.82rem; color: var(--yellow-light); font-weight: 600; margin-top: 8px; }

/* ── SUBJECT PILLS ──────────────────────────────────────────────────────── */
.subject-pills { display: flex; flex-wrap: wrap; gap: 12px; }
.subject-pill {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 18px; border-radius: var(--radius-md);
  background: var(--bg-card); border: 1px solid var(--border-color);
  font-size: 0.9rem; color: var(--text-secondary); font-weight: 500;
}

/* ── FEATURES ───────────────────────────────────────────────────────────── */
.features-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 20px; }
.feature-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-lg); padding: 28px 24px;
}
.feature-icon { font-size: 2rem; margin-bottom: 12px; }
.feature-card h3 { font-size: 1rem; font-weight: 700; color: var(--purple-light); margin-bottom: 8px; }
.feature-card p  { font-size: 0.875rem; color: var(--text-secondary); }

/* ── BUTTONS ────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 20px; border-radius: var(--radius-md);
  font-size: 0.9rem; font-weight: 600; cursor: pointer;
  border: none; transition: all 0.2s; text-decoration: none;
}
.btn-primary   { background: var(--purple-primary); color: #fff; }
.btn-primary:hover { background: var(--purple-dark); color: #fff; transform: translateY(-1px); box-shadow: 0 4px 16px var(--purple-glow); }
.btn-secondary { background: var(--bg-card); color: var(--text-primary); border: 1px solid var(--border-color); }
.btn-secondary:hover { border-color: var(--purple-primary); color: var(--purple-light); }
.btn-ghost { background: none; color: var(--purple-light); border: 1px solid var(--purple-border); }
.btn-ghost:hover { background: var(--purple-glow); color: var(--yellow-light); }
.btn-yellow { background: var(--yellow-primary); color: #1a1228; }
.btn-yellow:hover { background: var(--yellow-light); transform: translateY(-1px); }
.btn-lg { padding: 13px 28px; font-size: 1rem; }
.btn-sm { padding: 5px 12px; font-size: 0.8rem; }
.btn-full { width: 100%; justify-content: center; }

/* ── LESSON HERO ────────────────────────────────────────────────────────── */
.lesson-hero {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 32px 24px;
}
.lesson-hero-inner { max-width: 1280px; margin: 0 auto; }
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 0.82rem; color: var(--text-muted); margin-bottom: 20px; flex-wrap: wrap; }
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--purple-light); }
.breadcrumb-sep { color: var(--text-muted); }
.lesson-title-wrap { display: flex; align-items: flex-start; gap: 20px; }
.lesson-big-icon { font-size: 3rem; line-height: 1; }
.lesson-title { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 800; margin-bottom: 8px; }
.lesson-subtitle { color: var(--text-secondary); font-size: 0.9rem; display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }

/* ── BADGES ─────────────────────────────────────────────────────────────── */
.badge { padding: 3px 10px; border-radius: 99px; font-size: 0.76rem; font-weight: 600; }
.badge-purple { background: var(--purple-glow); color: var(--purple-light); border: 1px solid var(--purple-border); }
.badge-yellow { background: var(--yellow-glow); color: var(--yellow-light); border: 1px solid rgba(249,168,37,0.3); }
.badge-blue   { background: rgba(66,165,245,0.15); color: #64b5f6; border: 1px solid rgba(66,165,245,0.25); }
.badge-green  { background: rgba(46,125,50,0.2); color: #66bb6a; border: 1px solid rgba(46,125,50,0.3); }

/* ── TABS ───────────────────────────────────────────────────────────────── */
.content-wrap { max-width: 1280px; margin: 0 auto; padding: 0 24px 40px; }
.content-tabs {
  display: flex; border-bottom: 1px solid var(--border-color);
  margin-bottom: 0; overflow-x: auto;
}
.tab-btn {
  padding: 14px 22px; background: none; border: none; cursor: pointer;
  color: var(--text-secondary); font-size: 0.9rem; font-weight: 500;
  border-bottom: 3px solid transparent; transition: all 0.2s; white-space: nowrap;
}
.tab-btn:hover  { color: var(--purple-light); }
.tab-btn.active { color: var(--yellow-light); border-bottom-color: var(--yellow-primary); font-weight: 700; }
.tab-panel { display: none; padding: 28px 0; }
.tab-panel.active { display: block; }

/* ── THEORY ─────────────────────────────────────────────────────────────── */
.theory-block { margin-bottom: 28px; }
.theory-block h3 { font-size: 1.1rem; font-weight: 700; color: var(--purple-light); margin-bottom: 12px; padding-bottom: 8px; border-bottom: 1px solid var(--border-color); }
.theory-block p  { color: var(--text-secondary); margin-bottom: 12px; font-size: 0.95rem; }
.tip-box { background: var(--purple-glow); border: 1px solid var(--purple-border); border-radius: var(--radius-md); padding: 16px 20px; display: flex; gap: 12px; align-items: flex-start; margin: 16px 0; }
.tip-icon { font-size: 1.2rem; flex-shrink: 0; }
.key-formula { background: var(--bg-card); border: 1px solid var(--border-color); border-left: 4px solid var(--yellow-primary); border-radius: var(--radius-md); padding: 16px 20px; margin: 16px 0; }
.key-formula-label { font-size: 0.75rem; color: var(--yellow-light); font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 8px; }
.info-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; margin: 16px 0; }
.info-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 16px; }
.info-card h4 { color: var(--yellow-light); font-size: 0.85rem; margin-bottom: 6px; }
.info-card p  { color: var(--text-secondary); font-size: 0.82rem; }

/* ── TOOL WRAP ──────────────────────────────────────────────────────────── */
.tool-wrap { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-lg); overflow: hidden; margin-bottom: 20px; }
.tool-header { background: var(--bg-secondary); padding: 14px 20px; display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 0.95rem; border-bottom: 1px solid var(--border-color); }
.tool-header-icon { font-size: 1.2rem; }
.tool-body { padding: 24px; }

/* ── CALCULATOR CONTROLS ────────────────────────────────────────────────── */
.controls-row { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 16px; }
.ctrl-group { display: flex; flex-direction: column; gap: 6px; flex: 1; min-width: 160px; }
.ctrl-label { font-size: 0.8rem; color: var(--text-secondary); font-weight: 500; }
.ctrl-input {
  background: var(--bg-input); border: 1px solid var(--border-color);
  border-radius: var(--radius-sm); padding: 9px 12px;
  color: var(--text-primary); font-size: 0.9rem; width: 100%;
  transition: border-color 0.2s;
}
.ctrl-input:focus { outline: none; border-color: var(--purple-primary); }
.ctrl-select { background: var(--bg-input); border: 1px solid var(--border-color); border-radius: var(--radius-sm); padding: 9px 12px; color: var(--text-primary); font-size: 0.9rem; width: 100%; }
.result-box { background: var(--bg-input); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 16px; min-height: 52px; }
.calc-step { color: var(--text-secondary); font-size: 0.875rem; margin-bottom: 6px; }
.calc-answer { color: var(--yellow-light); font-size: 1.05rem; font-weight: 700; margin-top: 6px; }

/* ── CANVAS WRAP ────────────────────────────────────────────────────────── */
.canvas-wrap { width: 100%; position: relative; }
.canvas-wrap canvas { width: 100%; display: block; }

/* ── QUIZ ───────────────────────────────────────────────────────────────── */
.quiz-counter { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.quiz-counter-text { font-size: 0.85rem; color: var(--text-secondary); }
.score-badge { background: var(--yellow-glow); border: 1px solid rgba(249,168,37,0.3); color: var(--yellow-light); padding: 4px 12px; border-radius: 99px; font-size: 0.82rem; font-weight: 600; }
.quiz-progress-bar { height: 4px; background: var(--bg-input); border-radius: 2px; margin-bottom: 20px; }
.quiz-progress-fill { height: 100%; background: linear-gradient(90deg, var(--purple-primary), var(--yellow-primary)); border-radius: 2px; transition: width 0.4s; }
.question-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-lg); padding: 24px; margin-bottom: 16px; }
.q-number { font-size: 0.78rem; color: var(--yellow-light); font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 10px; }
.q-text { font-size: 1.05rem; font-weight: 600; color: var(--text-primary); margin-bottom: 16px; line-height: 1.5; }
.options-grid { display: flex; flex-direction: column; gap: 10px; }
.option-btn {
  display: flex; align-items: center; gap: 12px;
  padding: 13px 16px; background: var(--bg-input);
  border: 1.5px solid var(--border-color); border-radius: var(--radius-md);
  color: var(--text-primary); cursor: pointer; text-align: left;
  transition: all 0.18s; font-size: 0.9rem; width: 100%;
}
.option-btn:hover:not(:disabled) { border-color: var(--purple-primary); background: var(--purple-glow); }
.option-btn.correct { border-color: #4caf50; background: rgba(76,175,80,0.15); color: #a5d6a7; }
.option-btn.wrong   { border-color: #e53935; background: rgba(229,57,53,0.12); color: #ef9a9a; }
.option-letter { background: var(--purple-glow); border: 1px solid var(--purple-border); color: var(--purple-light); width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 0.82rem; flex-shrink: 0; }
.explanation-box { background: rgba(249,168,37,0.08); border: 1px solid rgba(249,168,37,0.2); border-radius: var(--radius-md); padding: 14px 16px; font-size: 0.875rem; color: var(--text-secondary); display: none; margin-top: 12px; }
.explanation-box.show { display: block; }
.quiz-nav { display: flex; justify-content: space-between; align-items: center; }
.results-card { text-align: center; padding: 40px 24px; background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-lg); }
.result-emoji  { font-size: 4rem; display: block; margin-bottom: 12px; }
.result-score-big { font-size: 3.5rem; font-weight: 800; color: var(--yellow-light); }
.result-msg { color: var(--text-secondary); margin: 8px 0 24px; }

/* ── SUBJECT SECTION ────────────────────────────────────────────────────── */
.subject-section { margin-bottom: 36px; }
.subject-header { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--border-color); }
.subject-emoji { font-size: 1.4rem; }
.subject-name  { font-size: 1.05rem; font-weight: 700; color: var(--text-primary); }
.subject-count { margin-left: auto; font-size: 0.8rem; color: var(--text-muted); }
.topic-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 14px; }
.topic-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-lg); padding: 20px; display: flex; flex-direction: column; gap: 6px;
  transition: all 0.2s;
}
.topic-card:hover { background: var(--bg-card-hover); border-color: var(--purple-primary); transform: translateY(-2px); box-shadow: 0 6px 20px var(--purple-glow); }
.topic-icon { font-size: 1.6rem; }
.topic-name { font-size: 0.92rem; font-weight: 700; color: var(--text-primary); }
.topic-desc { font-size: 0.78rem; color: var(--text-secondary); flex: 1; line-height: 1.4; }
.topic-footer { display: flex; align-items: center; justify-content: space-between; margin-top: 10px; }
.topic-arrow { color: var(--yellow-light); font-size: 1rem; }
.difficulty-dots { display: flex; gap: 4px; }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--bg-input); border: 1px solid var(--border-color); }
.dot.active { background: var(--yellow-primary); border-color: var(--yellow-primary); }

/* ── PROGRESS PAGE ──────────────────────────────────────────────────────── */
.progress-overview { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 32px; }
.prog-stat { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-lg); padding: 24px; flex: 1; min-width: 140px; text-align: center; }
.prog-stat-num { font-size: 2.2rem; font-weight: 800; color: var(--yellow-light); }
.prog-stat-label { font-size: 0.78rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-top: 4px; }
.progress-history { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.history-item { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 14px 18px; display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.history-topic { font-weight: 600; font-size: 0.92rem; }
.history-score { margin-left: auto; font-size: 0.88rem; color: var(--text-secondary); display: flex; align-items: center; gap: 4px; }
.history-date  { font-size: 0.78rem; color: var(--text-muted); }

/* ── NAV GRID ───────────────────────────────────────────────────────────── */
.grid-nav { display: flex; justify-content: space-between; align-items: center; margin-top: 32px; padding-top: 20px; border-top: 1px solid var(--border-color); }
.grid-nav a { color: var(--text-secondary); font-size: 0.88rem; transition: color 0.2s; }
.grid-nav a:hover { color: var(--purple-light); }

/* ── FOOTER ─────────────────────────────────────────────────────────────── */
.site-footer { background: var(--bg-secondary); border-top: 1px solid var(--border-color); padding: 32px 24px; text-align: center; }

/* ── TOOLS PAGE TABS ────────────────────────────────────────────────────── */
#lessonTabs { max-width: 1280px; margin: 0 auto; padding: 0 24px 48px; }

/* ── FLOATERS ───────────────────────────────────────────────────────────── */
.floater {
  position: fixed; pointer-events: none; z-index: 0;
  color: rgba(206,147,216,0.12); font-size: 1.1rem; font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
  animation: floatUp linear infinite;
  user-select: none;
}
@keyframes floatUp { from { transform: translateY(100vh) rotate(0deg); opacity: 0; } 10% { opacity: 1; } 90% { opacity: 0.6; } to { transform: translateY(-10vh) rotate(360deg); opacity: 0; } }

/* ── RESPONSIVE ─────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .hero { padding: 60px 20px 40px; }
  .section { padding: 40px 20px; }
  .lesson-title-wrap { flex-direction: column; gap: 12px; }
  .lesson-big-icon { font-size: 2.2rem; }
  .content-wrap { padding: 0 16px 32px; }
  .controls-row { flex-direction: column; }
  .history-item { flex-direction: column; align-items: flex-start; }
  .grid-nav { flex-direction: column; gap: 12px; text-align: center; }
  .hero-stats { gap: 20px; }
  .tool-body { padding: 16px; }
}

/* ── TABLE STYLES ───────────────────────────────────────────────────────── */
.geo-table { width: 100%; border-collapse: collapse; font-size: 0.875rem; margin: 12px 0; }
.geo-table th { background: var(--purple-glow); color: var(--purple-light); padding: 10px 14px; text-align: left; font-weight: 600; border: 1px solid var(--border-color); }
.geo-table td { padding: 9px 14px; border: 1px solid var(--border-color); color: var(--text-secondary); }
.geo-table tr:nth-child(even) td { background: rgba(106,27,154,0.04); }

/* ── MAP DISPLAY ────────────────────────────────────────────────────────── */
.map-container { background: var(--bg-input); border: 1px solid var(--border-color); border-radius: var(--radius-md); overflow: hidden; }