/* ============================================================
   AquaForge — Wastewater Treatment Virtual Academy
   Educational simulator styles
   ============================================================ */

:root {
  --bg: #07111f;
  --panel: #0e1a2e;
  --panel-2: #13233b;
  --text: #edf5ff;
  --muted: #8fa6c2;
  --line: rgba(255, 255, 255, 0.09);
  --cyan: #36d8ff;
  --green: #6df6a0;
  --purple: #ab8cff;
  --amber: #ffd166;
  --red: #ff7770;
  --orange: #ff9b5c;
  --shadow: 0 25px 70px rgba(0, 0, 0, 0.32);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--text);
  font-family: 'Inter', system-ui, sans-serif;
  background:
    radial-gradient(circle at 20% -10%, #173863 0, transparent 35%),
    radial-gradient(circle at 100% 0, #142744 0, transparent 33%),
    var(--bg);
  min-height: 100vh;
}

body.light {
  --bg: #e8f1fa;
  --panel: #ffffff;
  --panel-2: #edf5fc;
  --text: #102238;
  --muted: #58718f;
  --line: rgba(16, 34, 56, 0.14);
  background: #e8f1fa;
}

body.light .topbar,
body.light .nav-card,
body.light .mission-card,
body.light .glass-card,
body.light .kpi-card { background: #ffffff; }

body.light .nav-item.active { color: #0b3d5c; }

/* ---------- App shell ---------- */
.app-shell { max-width: 1800px; margin: auto; padding: 22px; }

/* ---------- Topbar ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 20px; padding: 20px 24px;
  background: rgba(8, 17, 32, 0.78);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px);
}

.brand { display: flex; align-items: center; gap: 15px; min-width: 0; }

.brand-mark {
  width: 58px; height: 58px; flex: none;
  border-radius: 19px;
  display: grid; place-items: center;
  font-size: 25px;
  background: linear-gradient(135deg, #2876ff, #22d3ee);
  box-shadow: 0 12px 40px #1b8cff55;
  color: #fff;
}

.eyebrow {
  font-size: 11px; letter-spacing: 0.16em;
  color: #7fdcff; font-weight: 800; text-transform: uppercase;
}

.brand h1 { font-family: 'Space Grotesk', sans-serif; font-size: 27px; margin: 4px 0; }
.brand p { margin: 0; color: var(--muted); }

.language-chip {
  display: inline-flex; margin-top: 9px; padding: 4px 8px;
  border: 1px solid rgba(54, 216, 255, 0.22);
  border-radius: 999px; color: var(--cyan);
  background: rgba(54, 216, 255, 0.07);
  font-family: 'Space Mono', monospace; font-size: 10px;
}

.top-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }

/* ---------- Buttons ---------- */
.icon-btn, .ghost-btn, .primary-btn, .secondary-btn,
.scenario-btn, .micro-btn, .choice-btn {
  font: inherit;
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 12px;
  padding: 10px 13px;
  cursor: pointer;
  background: #13233a;
  transition: transform 0.18s ease, filter 0.18s ease, border-color 0.18s ease;
}

.icon-btn { width: 42px; height: 42px; padding: 0; display: grid; place-items: center; }

.primary-btn {
  background: linear-gradient(135deg, #2876ff, #1fc8eb);
  border: 0; color: #fff; font-weight: 600;
  display: inline-flex; align-items: center; gap: 8px;
}

.secondary-btn {
  color: var(--cyan);
  border-color: rgba(54, 216, 255, 0.35);
  background: rgba(54, 216, 255, 0.09);
  display: inline-flex; align-items: center; gap: 8px;
}

.ghost-btn { display: inline-flex; align-items: center; gap: 8px; }

.icon-btn:hover, .ghost-btn:hover, .primary-btn:hover,
.secondary-btn:hover, .scenario-btn:hover, .micro-btn:hover, .choice-btn:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.primary-btn:hover { filter: brightness(1.1); }

/* ---------- Hero strip ---------- */
.hero-strip {
  display: flex; justify-content: space-between; align-items: center;
  color: var(--muted); font-size: 12px; margin: 12px 5px 18px;
  font-family: 'Space Mono', monospace; gap: 15px; flex-wrap: wrap;
}

.live-dot {
  display: inline-block; width: 8px; height: 8px; border-radius: 50%;
  background: var(--green); box-shadow: 0 0 13px var(--green);
  margin-right: 6px;
}

/* ---------- Workspace layout ---------- */
.workspace {
  display: grid; grid-template-columns: 260px 1fr; gap: 20px;
}

.sidebar { display: flex; flex-direction: column; gap: 16px; }

.nav-card, .mission-card {
  background: rgba(13, 27, 48, 0.85);
  border: 1px solid var(--line);
  border-radius: 20px; padding: 14px;
  box-shadow: var(--shadow);
}

.nav-label {
  font-size: 10px; letter-spacing: 0.14em; color: var(--muted);
  padding: 8px 12px 12px; font-weight: 800;
}

.nav-item {
  width: 100%; display: flex; align-items: center; gap: 12px;
  color: var(--muted); border: 0; background: transparent;
  padding: 12px 12px; border-radius: 12px;
  text-align: left; cursor: pointer; font: inherit;
  transition: background 0.18s ease, color 0.18s ease;
}

.nav-item i { width: 20px; text-align: center; font-size: 14px; }

.nav-item.active, .nav-item:hover {
  background: linear-gradient(90deg, rgba(27, 92, 255, 0.2), transparent);
  color: #fff;
}

body.light .nav-item.active, body.light .nav-item:hover { color: #0b3d5c; }

.nav-item.active i { color: var(--cyan); }

.mission-card { padding: 18px; }

.mission-icon {
  width: 42px; height: 42px; border-radius: 14px;
  display: grid; place-items: center;
  background: rgba(171, 140, 255, 0.13); color: var(--purple);
  font-size: 20px;
}

.mission-card h3 { margin: 14px 0 7px; }
.mission-card p { font-size: 13px; line-height: 1.7; color: var(--muted); margin: 0; }

.progress {
  height: 7px; background: #20334d; border-radius: 9px;
  margin: 17px 0 8px; overflow: hidden;
}

.progress span {
  display: block; width: 68%; height: 100%;
  background: linear-gradient(90deg, var(--purple), var(--cyan));
  border-radius: 9px;
}

.mission-card small {
  color: var(--muted); font-size: 11px;
  display: flex; justify-content: space-between;
}

.sidebar-footer {
  display: flex; flex-direction: column; gap: 10px;
  color: var(--muted); font-size: 11px; padding: 3px 8px;
}

.status-chip { color: var(--green); }
.status-chip i { font-size: 7px; }

/* ---------- Main content ---------- */
.main-content { min-width: 0; }
.page-section { display: none; animation: sectionIn 0.3s ease both; }
.page-section.active { display: block; }

.page-heading {
  display: flex; justify-content: space-between; align-items: flex-end;
  gap: 20px; margin-bottom: 20px;
}

.page-heading h2 {
  font: 700 34px 'Space Grotesk', sans-serif;
  margin: 8px 0; letter-spacing: -0.03em;
}

.page-heading p { margin: 0; color: var(--muted); max-width: 660px; line-height: 1.6; }

.heading-actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* ---------- Learning map ---------- */
.learning-map {
  margin: 0 0 16px; padding: 16px;
  border: 1px solid rgba(54, 216, 255, 0.18);
  border-radius: 16px;
  background: linear-gradient(110deg, rgba(54, 216, 255, 0.09), rgba(19, 35, 59, 0.68) 48%, rgba(171, 140, 255, 0.08));
}

.learning-map-head {
  display: flex; justify-content: space-between;
  align-items: flex-start; gap: 16px; margin-bottom: 13px;
  flex-wrap: wrap;
}

.learning-map-head h3 { margin: 5px 0 4px; font-family: 'Space Grotesk', sans-serif; }
.learning-map-head p { margin: 0; color: var(--muted); font-size: 12px; }

.map-route {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 7px 9px; border-radius: 999px;
  color: var(--cyan); background: rgba(54, 216, 255, 0.1);
  font: 10px 'Space Mono', monospace; white-space: nowrap;
}

.learning-phases {
  display: grid; grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
}

.learning-phase {
  display: grid; grid-template-columns: auto auto 1fr auto;
  gap: 8px; align-items: start;
  padding: 11px; text-align: left;
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  background: rgba(8, 20, 38, 0.5);
  cursor: pointer; font: inherit;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.learning-phase:hover {
  transform: translateY(-2px);
  border-color: rgba(54, 216, 255, 0.5);
  background: rgba(54, 216, 255, 0.1);
}

.phase-number { color: var(--muted); font: 10px 'Space Mono', monospace; }
.phase-icon {
  display: grid; place-items: center; width: 25px; height: 25px;
  border-radius: 8px; color: var(--cyan);
  background: rgba(54, 216, 255, 0.11);
}
.phase-copy { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.phase-copy b { font-size: 11px; }
.phase-copy small { color: var(--muted); font-size: 10px; line-height: 1.4; }
.phase-copy em { color: var(--cyan); font-size: 9px; font-style: normal; line-height: 1.35; }
.phase-arrow { align-self: center; color: var(--muted); font-size: 10px; }

/* ---------- KPI grid ---------- */
.kpi-grid {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px; margin-bottom: 18px;
}

.kpi-card {
  position: relative; overflow: hidden;
  border: 1px solid var(--line); border-radius: 18px;
  padding: 18px; min-height: 124px;
  background: linear-gradient(145deg, #142640, #0d192c);
}

.kpi-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 3px; background: var(--kpi);
}

.kpi-card.cyan { --kpi: var(--cyan); }
.kpi-card.green { --kpi: var(--green); }
.kpi-card.purple { --kpi: var(--purple); }
.kpi-card.amber { --kpi: var(--amber); }

.kpi-card span { color: var(--muted); font-size: 12px; }
.kpi-card strong {
  display: block; font: 700 28px 'Space Grotesk', sans-serif;
  margin: 13px 0 2px; color: var(--kpi);
}
.kpi-card small { color: var(--muted); font-size: 11px; }
.kpi-card > i {
  position: absolute; right: 18px; bottom: 17px;
  font-size: 29px; opacity: 0.24; color: var(--kpi);
}

/* ---------- Grid + glass card ---------- */
.grid-two {
  display: grid; grid-template-columns: 1.35fr 0.9fr; gap: 18px;
}
.lower-grid { margin-top: 18px; }

.glass-card {
  background: linear-gradient(145deg, rgba(18, 37, 62, 0.88), rgba(9, 20, 37, 0.88));
  border: 1px solid var(--line);
  border-radius: 20px; padding: 18px;
  box-shadow: var(--shadow);
}

.card-head {
  display: flex; justify-content: space-between; align-items: center;
  gap: 12px; margin-bottom: 16px;
}
.card-head h3 { margin: 5px 0 0; font-size: 19px; font-family: 'Space Grotesk', sans-serif; }

.mode-pill, .hint {
  font-size: 11px; padding: 7px 10px; border-radius: 999px;
  background: #1b3352; color: #b9dfff; white-space: nowrap;
}
.hint { background: transparent; color: var(--muted); }

/* ---------- Plant schematic ---------- */
.plant-canvas {
  height: 430px; position: relative;
  border-radius: 16px; overflow: hidden;
  background: radial-gradient(circle at 50% 50%, #17436a 0, #0b1d34 52%, #081321 100%);
  border: 1px solid var(--line);
}

.stream-label {
  position: absolute; top: 22px;
  font-size: 10px; letter-spacing: 0.14em; color: var(--muted);
  font-family: 'Space Mono', monospace;
}
.label-raw { right: 20px; }
.label-final { left: 20px; }

.unit {
  position: absolute; width: 125px; height: 120px;
  border-radius: 18px; border: 1px solid rgba(255, 255, 255, 0.13);
  background: linear-gradient(145deg, #1b3857, #10243d);
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: 5px; z-index: 2;
  box-shadow: 0 10px 35px rgba(0, 0, 0, 0.27);
  transition: transform 0.2s ease, border-color 0.2s ease;
  cursor: pointer;
}

.unit:hover { transform: translateY(-3px); border-color: var(--cyan); }
.unit b { font-size: 12px; }
.unit small { font-size: 9px; color: var(--muted); }

.unit-icon {
  width: 36px; height: 36px; border-radius: 11px;
  display: grid; place-items: center;
  background: rgba(54, 216, 255, 0.13); color: var(--cyan); font-size: 16px;
}

.headworks { right: 25px; top: 100px; }
.primary { right: 185px; top: 100px; }
.aeration { right: 345px; top: 100px; border-color: rgba(54, 216, 255, 0.55); box-shadow: 0 0 35px rgba(54, 216, 255, 0.11); }
.clarifier { right: 345px; top: 255px; }
.tertiary { right: 185px; top: 255px; }
.disinfection { right: 25px; top: 255px; }

.pipe-line {
  position: absolute; height: 4px;
  background: linear-gradient(90deg, rgba(54, 216, 255, 0.13), var(--cyan), rgba(54, 216, 255, 0.13));
  border-radius: 99px; z-index: 1;
}
.p1 { right: 150px; top: 158px; width: 35px; }
.p2 { right: 310px; top: 158px; width: 35px; }
.p3 { right: 310px; top: 213px; width: 35px; transform: rotate(90deg); }
.p4 { right: 150px; top: 313px; width: 35px; }
.p5 { right: 70px; top: 213px; width: 35px; transform: rotate(90deg); }

.return-line { position: absolute; height: 3px; border-radius: 99px; z-index: 1; }
.return-line span {
  position: absolute; right: 50%; top: -18px;
  font-size: 10px; font-family: 'Space Mono', monospace;
}
.ras-line { right: 280px; bottom: 37px; width: 150px; background: var(--green); transform: rotate(-15deg); }
.ras-line span { color: var(--green); }
.was-line { right: 185px; bottom: 17px; width: 100px; background: var(--red); transform: rotate(10deg); }
.was-line span { color: var(--red); }

.mini-bubbles::before, .mini-bubbles::after {
  content: ''; position: absolute;
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--cyan); bottom: 20px; left: 35px;
  box-shadow: 20px 5px var(--cyan), 40px -4px var(--cyan), 60px 7px var(--cyan);
  animation: rise 2.5s infinite ease-in;
}

.sludge-blanket {
  position: absolute; bottom: 0; left: 0; right: 0;
  height: 35%; border-radius: 50% 50% 0 0;
  background: linear-gradient(rgba(171, 140, 255, 0.13), rgba(171, 140, 255, 0.42));
  animation: blanket 4s ease-in-out infinite alternate;
  transition: height 0.4s ease;
}

.flow-particles { position: absolute; inset: 0; pointer-events: none; }

.flow-particle {
  position: absolute; width: 7px; height: 7px; border-radius: 50%;
  background: var(--cyan); box-shadow: 0 0 10px var(--cyan);
  animation: flow 4s linear infinite;
}

.plant-legend {
  display: flex; gap: 16px; flex-wrap: wrap;
  color: var(--muted); font-size: 11px; margin-top: 13px;
  font-family: 'Space Mono', monospace;
}
.plant-legend i { color: var(--cyan); }

.legend-dot {
  display: inline-block; width: 8px; height: 8px; border-radius: 50%;
  background: var(--cyan); margin-right: 6px;
}
.legend-dot.green { background: var(--green); }
.legend-dot.orange { background: var(--orange); }

/* ---------- Controls ---------- */
.control-group { margin: 18px 0; }
.control-group label {
  display: flex; justify-content: space-between; gap: 10px;
  color: #dceaff; font-size: 12px;
}
.control-group label span { display: flex; align-items: center; gap: 6px; }
.control-group b { color: var(--cyan); font-weight: 600; white-space: nowrap; }
.control-group input[type=range] {
  width: 100%; accent-color: var(--cyan); margin-top: 10px;
}

.control-actions {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 8px; margin-top: 22px;
}

.scenario-btn { font-size: 11px; padding: 9px; }
.scenario-btn.danger { background: #572b30; }

/* ---------- Insight + chart ---------- */
.insight-content { min-height: 130px; color: var(--muted); line-height: 1.75; }
.insight-line { display: flex; gap: 10px; margin-bottom: 10px; font-size: 13px; }
.insight-line i { color: var(--cyan); margin-top: 4px; }

.recommendation {
  display: flex; gap: 12px; align-items: flex-start;
  background: #132e3a; border: 1px solid rgba(54, 216, 255, 0.2);
  border-radius: 14px; padding: 13px; color: var(--cyan);
}
.recommendation b { color: #fff; font-size: 12px; }
.recommendation p { margin: 5px 0 0; color: #b9d1e8; font-size: 12px; line-height: 1.6; }

.status-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 10px; border-radius: 999px;
  background: rgba(54, 216, 255, 0.1); color: var(--cyan);
  font: 11px 'Space Mono', monospace; white-space: nowrap;
}

.chart-box {
  height: 240px; display: flex; align-items: flex-end;
  gap: 10px; padding: 22px 10px 24px;
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 12px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), transparent);
}

.bar {
  flex: 1; min-width: 22px; position: relative;
  height: var(--bar); border-radius: 5px 5px 2px 2px;
  background: linear-gradient(var(--cyan), rgba(54, 216, 255, 0.2));
  transition: height 0.35s ease;
}
.bar.green { background: linear-gradient(var(--green), rgba(109, 246, 160, 0.2)); }
.bar.purple { background: linear-gradient(var(--purple), rgba(171, 140, 255, 0.2)); }
.bar.amber { background: linear-gradient(var(--amber), rgba(255, 209, 102, 0.2)); }
.bar span {
  position: absolute; right: 50%; bottom: -21px;
  transform: translateX(50%); color: var(--muted);
  font: 9px 'Space Mono', monospace; white-space: nowrap;
}
.bar em {
  position: absolute; top: -19px; right: 50%;
  transform: translateX(50%); color: var(--text);
  font: 9px 'Space Mono', monospace; font-style: normal;
}

/* ---------- Process train ---------- */
.process-route {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  margin: 0 0 15px; padding: 12px 14px;
  border: 1px solid var(--line); border-radius: 12px;
  background: rgba(19, 35, 59, 0.4);
  color: var(--muted); font-size: 11px;
}
.process-route strong { color: var(--cyan); font-weight: 600; }
.process-route i { font-size: 9px; }
.route-label {
  margin-right: 3px; color: var(--muted);
  font: 10px 'Space Mono', monospace; letter-spacing: 0.08em;
}

.unit-library {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px;
}

.unit-detail {
  cursor: pointer; min-height: 190px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}
.unit-detail:hover { transform: translateY(-3px); border-color: rgba(54, 216, 255, 0.5); }
.unit-detail .big-icon { font-size: 28px; color: var(--cyan); margin-bottom: 16px; }
.unit-detail h3 { margin: 0 0 8px; font-family: 'Space Grotesk', sans-serif; }
.unit-detail p { color: var(--muted); font-size: 13px; line-height: 1.7; }
.unit-detail small { color: var(--muted); line-height: 1.5; }

/* ---------- Sludge lab ---------- */
.sludge-story { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }

.story-step {
  min-height: 200px; position: relative; padding: 17px;
  border: 1px solid var(--line); border-radius: 15px;
  background: linear-gradient(145deg, rgba(18, 37, 62, 0.95), rgba(9, 20, 37, 0.92));
}

.story-number { color: var(--muted); font: 10px 'Space Mono', monospace; }
.story-icon {
  width: 36px; height: 36px; display: grid; place-items: center;
  margin: 18px 0 13px; border-radius: 10px;
  background: rgba(54, 216, 255, 0.11); color: var(--cyan);
}
.story-step.purple .story-icon { color: var(--purple); background: rgba(171, 140, 255, 0.11); }
.story-step.green .story-icon { color: var(--green); background: rgba(109, 246, 160, 0.11); }
.story-step.amber .story-icon { color: var(--amber); background: rgba(255, 209, 102, 0.11); }

.story-step h3 { margin: 0 0 7px; font-family: 'Space Grotesk', sans-serif; font-size: 15px; }
.story-step strong { color: var(--cyan); font: 600 15px 'Space Mono', monospace; }
.story-step p { color: var(--muted); font-size: 12px; line-height: 1.65; margin: 6px 0 0; }

.subgrid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 16px; }

.mini-stat {
  padding: 11px; border: 1px solid var(--line);
  border-radius: 10px; background: rgba(19, 35, 59, 0.5);
}
.mini-stat span { display: block; color: var(--muted); font-size: 10px; }
.mini-stat strong {
  display: block; margin-top: 5px; color: var(--cyan);
  font: 600 15px 'Space Mono', monospace;
}

.body-copy { color: var(--muted); font-size: 13px; line-height: 1.7; }

/* ---------- Biology ---------- */
.biology-grid, .calc-grid, .clarifier-grid, .training-grid {
  display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 18px;
}

.microscope-view {
  height: 420px; border-radius: 16px; position: relative; overflow: hidden;
  background: #050c16; border: 1px solid rgba(54, 216, 255, 0.35);
  box-shadow: inset 0 0 90px rgba(20, 76, 106, 0.27);
}

.micro-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(54, 216, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(54, 216, 255, 0.06) 1px, transparent 1px);
  background-size: 35px 35px;
}

.microscope-label {
  position: absolute; top: 16px; left: 16px;
  font-size: 10px; letter-spacing: 0.15em; color: var(--cyan);
  font-family: 'Space Mono', monospace;
}

.scope-readout {
  position: absolute; right: 16px; top: 16px;
  color: var(--muted); font: 10px 'Space Mono', monospace;
}

.microbe {
  position: absolute; border: 2px solid var(--cyan);
  background: rgba(54, 216, 255, 0.13); border-radius: 50%;
  box-shadow: 0 0 18px rgba(54, 216, 255, 0.53);
  animation: micro 4s infinite ease-in-out;
}

.microbe.filament {
  height: 5px !important; border: 0; background: var(--amber);
  border-radius: 10px; box-shadow: 0 0 15px var(--amber);
}
.microbe.pin {
  border-color: var(--purple); background: rgba(171, 140, 255, 0.2);
  box-shadow: 0 0 13px var(--purple);
}

.micro-controls { display: flex; gap: 9px; flex-wrap: wrap; margin-top: 14px; }
.micro-btn { font-size: 11px; }
.micro-btn.active { background: #196a83; border-color: var(--cyan); }

.biology-info p { color: var(--muted); line-height: 1.8; font-size: 13px; }
.biology-tags { display: flex; gap: 8px; flex-wrap: wrap; margin: 18px 0; }
.biology-tags span {
  font-size: 11px; background: #192d48; color: #b9dfff;
  border-radius: 99px; padding: 7px 10px;
}

.equation-box {
  padding: 18px; border-radius: 15px;
  background: #152d3b; border: 1px solid rgba(54, 216, 255, 0.2);
  color: #b9eaff; line-height: 1.8; font-size: 13px;
}

.callout {
  display: flex; gap: 10px; align-items: flex-start;
  margin-top: 15px; padding: 12px;
  border: 1px solid rgba(54, 216, 255, 0.2); border-radius: 12px;
  color: var(--cyan); background: rgba(54, 216, 255, 0.07);
  font-size: 12px; line-height: 1.6;
}

/* ---------- Clarifier ---------- */
.clarifier-tank {
  height: 410px; position: relative; overflow: hidden;
  border: 1px solid rgba(54, 216, 255, 0.3);
  border-radius: 48% 48% 15px 15px;
  background: linear-gradient(rgba(54, 216, 255, 0.18) 0 48%, rgba(54, 216, 255, 0.05) 49%), #0a1524;
}

.clear-layer {
  position: absolute; top: 0; left: 0; right: 0; height: 39%;
  background: linear-gradient(180deg, rgba(54, 216, 255, 0.2), transparent);
}

.blanket-layer {
  position: absolute; bottom: 0; left: 0; right: 0;
  height: 35%; border-radius: 48% 48% 0 0;
  background: linear-gradient(rgba(171, 140, 255, 0.15), rgba(171, 140, 255, 0.48));
  transition: height 0.4s ease;
}

.settling-particles {
  position: absolute; inset: 0;
  background: radial-gradient(circle, rgba(54, 216, 255, 0.8) 0 2px, transparent 3px) 10px 30px / 42px 46px;
  opacity: 0.65;
  animation: settle 5s linear infinite;
}

.tank-label {
  position: absolute; left: 14px;
  color: var(--muted); font: 10px 'Space Mono', monospace;
}
.tank-label.top { top: 15px; color: var(--cyan); }
.tank-label.bottom { bottom: 15px; color: var(--purple); }

.timer {
  position: absolute; right: 16px; top: 15px;
  color: var(--text); font: 600 18px 'Space Mono', monospace;
}

.clarifier-controls { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 13px; }

.timeline {
  height: 6px; margin: 15px 0; overflow: hidden;
  border-radius: 99px; background: #20334d;
}
.timeline span {
  display: block; height: 100%; width: 0%;
  border-radius: inherit; background: var(--cyan);
  transition: width 0.3s ease;
}

.cylinder {
  position: relative; width: 120px; height: 280px;
  margin: 0 auto 20px;
  border: 2px solid rgba(54, 216, 255, 0.4);
  border-radius: 8px 8px 12px 12px;
  background: rgba(10, 21, 36, 0.8);
  overflow: hidden;
}

.cylinder-fill {
  position: absolute; bottom: 0; left: 0; right: 0;
  height: 40%; transition: height 0.5s ease;
  background: linear-gradient(rgba(171, 140, 255, 0.4), rgba(171, 140, 255, 0.7));
  border-radius: 0 0 10px 10px;
}

.cylinder-mark {
  position: absolute; left: 6px;
  color: var(--muted); font: 9px 'Space Mono', monospace;
}
.cylinder-mark.m100 { top: 66%; }
.cylinder-mark.m200 { top: 33%; }
.cylinder-mark.m300 { top: 8%; }

.cylinder strong {
  position: absolute; bottom: 12px; left: 50%;
  transform: translateX(-50%);
  color: var(--text); font: 600 18px 'Space Mono', monospace;
  text-align: center;
  text-shadow: 0 1px 6px rgba(0, 0, 0, 0.8);
}
.cylinder strong small { display: block; font-size: 10px; color: var(--muted); }

.speed-control {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--muted); font: 11px 'Space Mono', monospace;
}
.speed-control input { width: 80px; accent-color: var(--cyan); }

/* ---------- Calculations ---------- */
.formula { border-bottom: 1px solid var(--line); padding: 15px 0; }
.formula:last-child { border-bottom: 0; }
.formula b { display: block; font-size: 13px; }
.formula code {
  display: block; color: var(--cyan);
  font: 600 16px 'Space Grotesk', sans-serif; margin: 8px 0;
}
.formula small { color: var(--muted); }

.calc-list { display: flex; flex-direction: column; gap: 10px; }

.calc-card {
  padding: 13px; border: 1px solid var(--line);
  border-radius: 11px; background: rgba(19, 35, 59, 0.45);
}

.calc-card-top { display: flex; justify-content: space-between; gap: 10px; }
.calc-card h4 { margin: 0; font-size: 12px; }
.calc-result {
  color: var(--cyan); font: 600 14px 'Space Mono', monospace;
  text-align: right;
}
.calc-formula {
  margin: 7px 0; color: var(--muted);
  font: 10px 'Space Mono', monospace;
}
.calc-card p {
  margin: 4px 0 0; color: var(--muted);
  font-size: 11px; line-height: 1.55;
}

.step-button {
  border: 0; padding: 0; color: var(--cyan);
  background: transparent; font-size: 10px; cursor: pointer;
}

.steps {
  margin: 9px 0 0; padding: 9px;
  border-left: 2px solid var(--cyan);
  color: var(--muted); font: 10px/1.8 'Space Mono', monospace;
  background: rgba(54, 216, 255, 0.05);
}

.warning {
  padding: 10px 12px;
  border: 1px solid rgba(255, 209, 102, 0.36);
  border-radius: 10px;
  color: var(--amber);
  background: rgba(255, 209, 102, 0.08);
  font-size: 11px; line-height: 1.55;
}

.unit-note {
  margin-top: 18px; color: var(--muted);
  font-size: 11px; line-height: 1.7;
}

/* ---------- Scenarios ---------- */
.scenario-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }

.scenario-card {
  cursor: pointer; min-height: 220px; position: relative; overflow: hidden;
  display: flex; flex-direction: column; align-items: flex-start;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.scenario-card:hover { transform: translateY(-3px); border-color: rgba(54, 216, 255, 0.5); }

.scenario-card::after {
  content: ''; position: absolute;
  inset: auto -30px -50px auto;
  width: 150px; height: 150px; border-radius: 50%;
  background: rgba(54, 216, 255, 0.07);
  pointer-events: none;
}

.scenario-card h3 { margin: 0 0 8px; font-family: 'Space Grotesk', sans-serif; }
.scenario-card p { color: var(--muted); font-size: 13px; line-height: 1.7; }

.scenario-meta { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0; }

.scenario-card button { margin-top: auto; }

.scenario-reveal {
  margin-top: 12px; padding-top: 11px;
  border-top: 1px solid var(--line);
  color: var(--muted); font-size: 11px; line-height: 1.65;
}

.tag {
  display: inline-flex; align-items: center;
  padding: 6px 9px; border-radius: 999px;
  border: 1px solid rgba(171, 140, 255, 0.25);
  background: rgba(171, 140, 255, 0.09);
  color: var(--purple);
  font: 10px 'Space Mono', monospace;
}

/* ---------- Training ---------- */
.training-card { min-height: 240px; }

.training-progress {
  height: 5px; margin: 10px 0 18px;
  border-radius: 99px; background: #20334d;
}
.training-progress span {
  display: block; height: 100%; width: 10%;
  border-radius: inherit; background: var(--purple);
  transition: width 0.3s ease;
}

.training-card h3 { font: 600 19px 'Space Grotesk', sans-serif; margin: 12px 0; }

.choice-list { display: grid; gap: 8px; margin: 17px 0; }
.choice-btn { padding: 11px; text-align: left; font-size: 12px; }
.choice-btn.correct {
  border-color: var(--green);
  background: rgba(109, 246, 160, 0.12);
}
.choice-btn.incorrect {
  border-color: var(--red);
  background: rgba(255, 119, 112, 0.1);
}
.choice-btn:disabled { cursor: default; opacity: 0.85; }

.feedback {
  padding: 11px; border-radius: 10px;
  color: var(--muted); background: rgba(19, 35, 59, 0.7);
  font-size: 12px; line-height: 1.6;
}

/* ---------- Glossary ---------- */
.search-row { display: flex; gap: 10px; margin-bottom: 14px; }

.search-wrap { position: relative; flex: 1; }
.search-wrap i {
  position: absolute; left: 12px; top: 13px;
  color: var(--muted); font-size: 13px;
}
.search-input, .select-input {
  width: 100%; padding: 11px 12px;
  border: 1px solid var(--line); border-radius: 10px;
  color: var(--text); background: rgba(10, 21, 36, 0.8);
  font: inherit;
}
.search-wrap .search-input { padding-left: 35px; }
.select-input { max-width: 200px; }

.glossary-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; }

.glossary-card { min-height: 180px; }
.glossary-card h3 { color: var(--cyan); margin: 8px 0; font-family: 'Space Grotesk', sans-serif; }
.glossary-card .term-note { color: var(--text); font-size: 12px; line-height: 1.6; margin: 10px 0; }
.glossary-card small { color: var(--muted); font-size: 10.5px; line-height: 1.65; display: block; }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 15px; }
.about-card h3 { font: 600 20px 'Space Grotesk', sans-serif; }
.about-card p, .about-card li {
  color: var(--muted); font-size: 12px; line-height: 1.75;
}
.about-card ul { padding-left: 19px; }

.disclaimer {
  border-color: rgba(255, 209, 102, 0.35);
  background: rgba(255, 209, 102, 0.05);
}
.disclaimer h3 { color: var(--amber); }

/* ---------- Footer ---------- */
.footer-note {
  display: flex; justify-content: space-between; gap: 15px;
  margin-top: 32px; padding-top: 15px;
  border-top: 1px solid var(--line);
  color: var(--muted); font-size: 10px;
}
.footer-note strong { color: var(--cyan); font: 10px 'Space Mono', monospace; }

/* ---------- Drawer ---------- */
.drawer-backdrop {
  position: fixed; inset: 0; z-index: 30;
  display: flex; justify-content: flex-end;
  background: rgba(2, 8, 18, 0.72);
}

.drawer {
  width: min(480px, 100%); height: 100%; overflow: auto;
  padding: 25px; border-left: 1px solid rgba(54, 216, 255, 0.3);
  background: #0d1a2b; box-shadow: -25px 0 70px rgba(0, 0, 0, 0.5);
  animation: slideIn 0.25s ease both;
}
.drawer-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 15px; }
.drawer h2 { margin: 7px 0; font: 600 27px 'Space Grotesk', sans-serif; }
.drawer h4 {
  margin: 20px 0 5px; color: var(--cyan);
  font: 600 11px 'Space Mono', monospace;
  letter-spacing: 0.1em; text-transform: uppercase;
}
.drawer p { color: var(--muted); font-size: 12px; line-height: 1.7; }

/* ---------- Modal ---------- */
.modal-backdrop {
  position: fixed; inset: 0; z-index: 35;
  display: grid; place-items: center; padding: 20px;
  background: rgba(2, 8, 18, 0.78);
}

.modal-card {
  width: min(560px, 100%); max-height: 90vh; overflow: auto;
  position: relative; padding: 26px;
  border: 1px solid rgba(54, 216, 255, 0.3);
  border-radius: 18px; background: #0d1a2b;
  box-shadow: 0 25px 80px rgba(0, 0, 0, 0.55);
}
.modal-card h2 { font-family: 'Space Grotesk', sans-serif; margin: 8px 0; }
.modal-card p, .modal-card li { color: var(--muted); line-height: 1.75; font-size: 13px; }
.modal-card ul { padding-left: 20px; }

.modal-close {
  position: absolute; top: 13px; right: 13px;
  width: 32px; height: 32px; display: grid; place-items: center;
  border: 1px solid var(--line); border-radius: 9px;
  color: var(--text); background: transparent;
  cursor: pointer; font-size: 15px;
}
.modal-close:hover { border-color: var(--cyan); }

/* ---------- Toast ---------- */
.toast {
  position: fixed; bottom: 24px; left: 24px;
  background: #142c48; color: #fff;
  border: 1px solid rgba(54, 216, 255, 0.4);
  padding: 13px 17px; border-radius: 12px;
  transform: translateY(100px); opacity: 0;
  transition: 0.3s; z-index: 40;
  font-size: 13px;
}
.toast.show { transform: translateY(0); opacity: 1; }

/* ---------- Animations ---------- */
@keyframes sectionIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}
@keyframes slideIn {
  from { transform: translateX(30px); }
  to { transform: none; }
}
@keyframes rise {
  0% { transform: translateY(12px); opacity: 0; }
  20% { opacity: 1; }
  100% { transform: translateY(-30px); opacity: 0; }
}
@keyframes flow {
  0% { transform: translateX(0); opacity: 0; }
  15% { opacity: 1; }
  100% { transform: translateX(-820px); opacity: 0; }
}
@keyframes micro {
  0%, 100% { transform: translate(0, 0) rotate(0); }
  50% { transform: translate(15px, -12px) rotate(8deg); }
}
@keyframes blanket {
  from { transform: scaleX(0.97); }
  to { transform: scaleX(1.04); }
}
@keyframes settle {
  from { transform: translateY(-20px); opacity: 0.75; }
  to { transform: translateY(115px); opacity: 0.25; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1250px) {
  .workspace { grid-template-columns: 1fr; }
  .sidebar { display: grid; grid-template-columns: 1fr 1fr; }
  .sidebar-footer { display: none; }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .learning-phases { grid-template-columns: repeat(3, 1fr); }
  .unit-library, .glossary-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  .grid-two, .biology-grid, .calc-grid, .clarifier-grid, .training-grid,
  .about-grid { grid-template-columns: 1fr; }
  .sludge-story { grid-template-columns: 1fr 1fr; }
  .scenario-grid { grid-template-columns: 1fr; }
}

@media (max-width: 850px) {
  .topbar, .page-heading {
    align-items: flex-start; flex-direction: column;
  }
  .top-actions { width: 100%; }
  .unit-library, .glossary-grid { grid-template-columns: 1fr; }
  .sidebar { display: flex; }
  .kpi-grid { grid-template-columns: 1fr 1fr; }
  .brand h1 { font-size: 22px; }
  .learning-phases { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .kpi-grid { grid-template-columns: 1fr; }
  .sludge-story { grid-template-columns: 1fr; }
  .control-actions { grid-template-columns: 1fr; }
  .subgrid { grid-template-columns: 1fr 1fr; }
  .search-row { flex-direction: column; }
  .select-input { max-width: none; }
}





.goog-te-banner-frame { display: none !important; }
body { top: 0 !important; }