:root {
  --green: #27ae60;
  --green-dark: #145a32;
  --green-deep: #0b3d25;
  --mint: #e9fff3;
  --mint-2: #d9f7e6;
  --text: #10251a;
  --muted: #557267;
  --card: rgba(255, 255, 255, 0.86);
  --stroke: rgba(20, 90, 50, 0.18);
  --shadow: 0 22px 55px rgba(15, 88, 48, 0.16);
  --radius: 28px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(39,174,96,0.28), transparent 36rem),
    radial-gradient(circle at bottom right, rgba(20,90,50,0.22), transparent 32rem),
    linear-gradient(135deg, #f5fff9 0%, #e4f8ee 52%, #f8fffb 100%);
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .18;
  background-image: linear-gradient(90deg, rgba(20,90,50,.08) 1px, transparent 1px), linear-gradient(rgba(20,90,50,.08) 1px, transparent 1px);
  background-size: 34px 34px;
}
.app-shell { width: min(1180px, calc(100% - 24px)); margin: 0 auto; padding: 18px 0 36px; position: relative; }
.glass-panel, .glass-card {
  background: var(--card);
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}
.hero { border-radius: 36px; padding: clamp(22px, 4vw, 42px); display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 22px; align-items: center; overflow: hidden; }
.eyebrow { margin: 0 0 8px; color: var(--green-dark); font-weight: 900; letter-spacing: .13em; text-transform: uppercase; font-size: .78rem; }
h1, h2, h3 { margin: 0; line-height: 1.08; }
h1 { font-size: clamp(2.1rem, 7vw, 4.5rem); color: var(--green-deep); letter-spacing: -0.06em; }
h2 { font-size: clamp(1.6rem, 4vw, 2.5rem); letter-spacing: -0.04em; }
h3 { font-size: 1.25rem; }
p { line-height: 1.55; }
.hero-text, .section-heading p, .diagram-panel p { color: var(--muted); font-size: 1.03rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 22px; }
.primary-btn, .secondary-btn, .tab-btn, .mode-btn, .topic-card, .library-card, .answer-option, .small-pill {
  border: 0; font: inherit; cursor: pointer; font-weight: 850;
}
.primary-btn, .secondary-btn {
  border-radius: 999px; padding: 13px 19px; min-height: 46px;
}
.primary-btn { background: linear-gradient(135deg, var(--green), var(--green-dark)); color: #fff; box-shadow: 0 14px 28px rgba(39,174,96,.24); }
.secondary-btn { background: rgba(255,255,255,.76); color: var(--green-dark); border: 1px solid var(--stroke); }
.hero-badge { min-width: 145px; min-height: 145px; border-radius: 50%; background: linear-gradient(135deg, var(--green), var(--green-dark)); color: white; display: grid; place-items: center; text-align: center; box-shadow: 0 18px 35px rgba(20,90,50,.26); }
.hero-badge span { display:block; font-size: 2.8rem; font-weight: 950; line-height: 1; }
.hero-badge small { display:block; max-width: 80px; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; font-size: .72rem; }
.tab-bar { position: sticky; top: 10px; z-index: 10; margin: 18px 0; border-radius: 999px; padding: 8px; display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
.tab-btn { border-radius: 999px; padding: 15px 10px; background: transparent; color: var(--green-dark); }
.tab-btn.active { color: white; background: linear-gradient(135deg, var(--green), var(--green-dark)); box-shadow: inset 0 0 0 1px rgba(255,255,255,.18), 0 12px 22px rgba(39,174,96,.20); }
.tab-view { animation: fade .22s ease; }
@keyframes fade { from { opacity: .3; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
.section-heading { padding: 18px 8px 12px; }
.section-heading.compact { padding: 0 0 16px; }
.topic-grid, .diagram-library, .lab-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; }
.topic-card, .library-card { text-align: left; background: rgba(255,255,255,.84); border: 1px solid var(--stroke); border-radius: 24px; padding: 18px; box-shadow: 0 12px 28px rgba(20,90,50,.08); color: var(--text); transition: transform .16s ease, border .16s ease; }
.topic-card:hover, .library-card:hover { transform: translateY(-2px); border-color: rgba(39,174,96,.52); }
.topic-card.active, .library-card.active { background: linear-gradient(135deg, #f8fffb, #dff9ea); border-color: var(--green); box-shadow: 0 16px 34px rgba(39,174,96,.16); }
.topic-card .num, .library-card .num { display:inline-grid; place-items:center; width:36px; height:36px; border-radius: 50%; background: var(--green); color:#fff; font-weight:950; margin-bottom: 10px; }
.progress-track { height: 8px; background: #d9eee2; border-radius: 999px; margin-top: 14px; overflow: hidden; }
.progress-track span { display: block; height: 100%; background: linear-gradient(90deg, var(--green), var(--green-dark)); border-radius: inherit; }
.glass-card { border-radius: var(--radius); padding: clamp(18px, 3vw, 28px); margin-top: 16px; }
.topic-detail { display: grid; gap: 18px; }
.detail-hero { display: grid; grid-template-columns: minmax(0,1fr) auto; gap: 16px; align-items: start; }
.topic-badge { border-radius: 999px; padding: 10px 14px; background: #e3f8ed; color: var(--green-dark); font-weight: 900; white-space: nowrap; }
.study-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; }
.study-box { background: rgba(255,255,255,.75); border: 1px solid var(--stroke); border-radius: 22px; padding: 18px; }
.study-box h4 { margin: 0 0 10px; color: var(--green-dark); font-size: 1rem; }
ul.clean-list { margin: 0; padding-left: 1.1rem; }
ul.clean-list li { margin: .48rem 0; line-height: 1.42; }
.exam-focus { border-left: 5px solid var(--green); background: #f4fff8; padding: 16px; border-radius: 16px; }
.search-label { display:block; font-weight:900; color: var(--green-dark); margin-bottom:8px; }
.search-input, select, input[type="text"], textarea {
  width: 100%; border-radius: 18px; border: 1px solid rgba(20,90,50,.22); background: rgba(255,255,255,.86); padding: 14px 16px; font: inherit; color: var(--text); outline: none;
}
.search-input:focus, select:focus, input[type="text"]:focus, textarea:focus { border-color: var(--green); box-shadow: 0 0 0 4px rgba(39,174,96,.12); }
.dictionary-list { display:grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; margin-top: 14px; max-height: 560px; overflow:auto; padding-right: 4px; }
.term-card { border:1px solid var(--stroke); border-radius:20px; padding:16px; background: rgba(255,255,255,.78); }
.term-card strong { display:block; color: var(--green-dark); font-size:1.05rem; }
.term-card small { color: var(--muted); font-weight:800; }
.trainer-header { display:grid; grid-template-columns: minmax(0,1fr) auto; gap: 18px; align-items:center; margin-bottom: 18px; }
.mode-toggle { background: rgba(255,255,255,.7); border-radius:999px; padding: 6px; display:grid; grid-template-columns: repeat(3,1fr); gap: 6px; min-width: min(430px,100%); }
.mode-btn { border-radius: 999px; padding: 12px 18px; background: transparent; color: var(--green-dark); }
.mode-btn.active { background: linear-gradient(135deg, var(--green), var(--green-dark)); color:#fff; }
.trainer-layout { display:grid; grid-template-columns: minmax(0, 1.35fr) minmax(320px, .65fr); gap: 18px; align-items:start; }
.diagram-stage { min-height: 510px; background: rgba(242,255,247,.86); border-radius: 28px; border: 1px solid rgba(39,174,96,.16); padding: 10px; overflow:auto; display:grid; place-items:center; }
.diagram-stage svg { width: min(100%, 850px); min-width: 640px; height: auto; display:block; }
.svg-spot { cursor:pointer; }
.svg-spot circle { filter: drop-shadow(0 3px 5px rgba(0,0,0,.12)); }
.svg-spot.active circle { fill:#ffb612; stroke:#0b3d25; }
.diagram-panel { background: rgba(255,255,255,.8); border-radius: 24px; padding: 18px; border:1px solid var(--stroke); max-height: 620px; overflow:auto; }
.label-list { display:grid; gap: 10px; }
.label-card { border: 1px solid var(--stroke); background: rgba(255,255,255,.9); border-radius: 18px; padding: 14px; }
.label-card.active { border-color: var(--green); box-shadow: 0 0 0 4px rgba(39,174,96,.10); }
.label-card strong { color: var(--green-dark); }
.label-card .tip { display:block; color: var(--muted); margin-top: 8px; font-size: .92rem; }
.practice-options { display:grid; gap:10px; margin-top: 14px; }
.answer-option { text-align:left; border:1px solid var(--stroke); border-radius: 16px; background:#fff; padding: 13px; color: var(--text); }
.answer-option.correct { border-color:#27ae60; background:#e9fff3; }
.answer-option.wrong { border-color:#cf3f3f; background:#fff0f0; }
.test-label-row { margin: 12px 0; padding: 12px; border:1px solid var(--stroke); border-radius: 16px; background: rgba(255,255,255,.78); }
.lab-card { margin-top: 0; }
.lab-icon { width:52px; height:52px; display:grid; place-items:center; border-radius:18px; background:linear-gradient(135deg,var(--green),var(--green-dark)); color:#fff; font-weight:950; margin-bottom: 12px; }
.checklist-grid { display:grid; grid-template-columns: repeat(auto-fit, minmax(220px,1fr)); gap:12px; }
.checklist-grid div { border:1px solid var(--stroke); border-radius:18px; padding:14px; background: rgba(255,255,255,.78); }
.checklist-grid strong { display:block; color: var(--green-dark); margin-bottom: 4px; }
.quiz-toolbar { display:grid; grid-template-columns: minmax(220px,1fr) auto auto; gap: 12px; align-items:end; }
.quiz-toolbar label { font-weight: 900; color: var(--green-dark); }
.quiz-meta { margin: 14px 0; color: var(--muted); font-weight: 700; }
.question-list { display:grid; gap: 14px; }
.question-card { border:1px solid var(--stroke); border-radius: 22px; padding: 16px; background: rgba(255,255,255,.78); }
.question-head { display:flex; gap:10px; justify-content:space-between; align-items:start; margin-bottom: 10px; }
.mark-pill, .type-pill { border-radius:999px; padding: 6px 10px; background:#e4f7ed; color: var(--green-dark); font-size:.78rem; font-weight:900; white-space:nowrap; }
.options-grid { display:grid; gap: 8px; }
.memo { margin-top: 10px; border-left: 4px solid var(--green); padding: 10px 12px; border-radius: 10px; background:#f4fff8; color:#274137; }
.result-box { margin-top: 16px; border-radius: 20px; background:#0f3b27; color:#fff; padding: 18px; font-weight:800; }
.result-box p { color: rgba(255,255,255,.86); }
@media (max-width: 850px) {
  .app-shell { width: min(100% - 12px, 760px); padding-top: 8px; }
  .hero, .detail-hero, .trainer-header, .trainer-layout { grid-template-columns: 1fr; }
  .hero-badge { min-width: 110px; min-height:110px; justify-self:start; }
  .tab-bar { grid-template-columns: repeat(5, minmax(92px,1fr)); overflow:auto; border-radius: 24px; position: sticky; }
  .tab-btn { white-space:nowrap; }
  .quiz-toolbar { grid-template-columns: 1fr; }
  .diagram-stage { min-height: 420px; justify-content:start; }
  .diagram-stage svg { min-width: 560px; }
  .mode-toggle { min-width: 100%; }
}
@media (max-width: 520px) {
  .hero-actions { display:grid; }
  .topic-grid, .diagram-library, .lab-grid, .study-grid { grid-template-columns: 1fr; }
  .glass-card { padding: 16px; border-radius: 22px; }
  .diagram-stage svg { min-width: 520px; }
}