/* ============================================================
   grammar.learnsyz.com — 重构版 Design System (style.css)
   Design language inherited from mastery.learnsyz.com
   Inter font · Navy primary · Blue/Green/Gold/Red accent
   ============================================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  --ink: #172033;
  --muted: #5f6f84;
  --line: #d8e1eb;
  --paper: #fff;
  --wash: #f5f8fb;
  --blue: #2458cf;
  --green: #08785f;
  --gold: #b87514;
  --red: #c73546;
  --navy: #111d31;
  --shadow: 0 18px 55px rgba(17, 29, 49, 0.12);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
}

/* ---------- Reset & Base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--wash);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ---------- Screen System (SPA pages) ---------- */
.screen {
  display: none;
  padding: 0;
}

.screen.active {
  display: block;
}

/* Special: hero section uses grid layout when active */
.hero.active {
  display: grid;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  font-weight: 850;
  line-height: 1.2;
  color: var(--ink);
}

h1 {
  font-size: clamp(39px, 5.8vw, 74px);
  letter-spacing: -0.02em;
}

h2 {
  font-size: 28px;
}

h3 {
  font-size: 20px;
}

p {
  margin-top: 0;
  color: var(--muted);
}

small, .text-sm {
  font-size: 13px;
}

/* ---------- Topbar / Navigation ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 24px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.topbar .brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 950;
  font-size: 20px;
  color: var(--ink);
  text-decoration: none;
  user-select: none;
}

.topbar .brand .logo-g {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--navy);
  color: #fff;
  font-weight: 950;
  font-size: 18px;
}

.topbar .tabs {
  display: flex;
  align-items: center;
  gap: 8px;
}

.topbar .tab {
  display: block;
  padding: 8px 16px;
  border-radius: 8px;
  font-weight: 850;
  font-size: 14px;
  background: #edf3fa;
  color: var(--ink);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  user-select: none;
  border: none;
  font-family: inherit;
  line-height: 1;
}

.topbar .tab:hover {
  background: #dce6f0;
}

.topbar .tab.active {
  background: var(--blue);
  color: #fff;
}

/* ---------- Hero Section ---------- */
.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.86fr;
  gap: 40px;
  min-height: calc(100vh - 62px);
  padding: 48px 56px;
  align-items: center;
  background: linear-gradient(135deg, var(--wash) 0%, #e8edf5 50%, var(--wash) 100%);
}

.hero .hero-left {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hero .hero-right {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.hero .pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 100px;
  background: rgba(36, 88, 207, 0.08);
  color: var(--blue);
  font-size: 13px;
  font-weight: 850;
  width: fit-content;
}

.hero .proof {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.hero .proof-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--muted);
}

.hero .proof-item strong {
  color: var(--ink);
  font-weight: 850;
}

.hero .hero-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 32px;
  box-shadow: var(--shadow);
  max-width: 400px;
  width: 100%;
}

/* ---------- CTAs ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 12px;
  font-weight: 850;
  font-size: 15px;
  font-family: var(--font);
  border: none;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
  line-height: 1;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--blue);
  color: #fff;
  box-shadow: 0 4px 14px rgba(36, 88, 207, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 6px 20px rgba(36, 88, 207, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--ink);
  border: 2px solid var(--line);
}

.btn-outline:hover {
  border-color: var(--blue);
  color: var(--blue);
}

.btn-ghost {
  background: transparent;
  color: var(--muted);
}

.btn-ghost:hover {
  color: var(--ink);
  background: rgba(0, 0, 0, 0.04);
}

/* ---------- Diagnostic (定位测试) ---------- */
.diag-progress {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  margin-bottom: 28px;
}

.diag-progress .diag-label {
  font-size: 14px;
  font-weight: 850;
  color: var(--muted);
  text-align: right;
}

.diag-track {
  height: 6px;
  border-radius: 3px;
  background: #e5edf1;
  overflow: hidden;
  min-width: 200px;
}

.diag-track i {
  display: block;
  height: 100%;
  border-radius: 3px;
  background: var(--blue);
  transition: width 0.3s ease;
  width: 0%;
}

.diag-progress .diag-step {
  font-size: 14px;
  font-weight: 850;
  color: var(--muted);
  text-align: left;
}

.diag-card {
  max-width: 680px;
  margin: 0 auto;
  padding: 28px 32px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow);
}

.diag-card .diag-question {
  font-size: 20px;
  font-weight: 850;
  margin-bottom: 20px;
  line-height: 1.4;
}

.diag-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 20px 0 16px;
}

.diag-option {
  padding: 16px 18px;
  border: 2px solid var(--line);
  border-radius: 12px;
  background: var(--paper);
  cursor: pointer;
  text-align: left;
  font-size: 16px;
  font-family: var(--font);
  font-weight: 500;
  color: var(--ink);
  line-height: 1.4;
  transition: border-color 0.2s, background 0.2s;
}

.diag-option:hover {
  border-color: var(--blue);
}

.diag-option.selected {
  border-color: var(--blue);
  background: rgba(36, 88, 207, 0.06);
}

.diag-option.correct {
  border-color: var(--green);
  background: #f0fbf7;
}

.diag-option.wrong {
  border-color: var(--red);
  background: #fff5f6;
}

.diag-feedback {
  margin-top: 12px;
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  display: none;
}

.diag-feedback.show {
  display: block;
}

.diag-feedback.ok {
  background: #f0fbf7;
  color: var(--green);
  border: 1px solid rgba(8, 120, 95, 0.2);
}

.diag-feedback.no {
  background: #fff5f6;
  color: var(--red);
  border: 1px solid rgba(199, 53, 70, 0.2);
}

.diag-next-btn {
  margin-top: 20px;
  display: flex;
  justify-content: flex-end;
}

/* ---------- Report (报告) ---------- */
#reportSection {
  position: relative;
}

.report-head {
  text-align: center;
  margin-bottom: 8px;
}

.report-lead {
  text-align: center;
  color: var(--muted);
  margin-bottom: 32px;
  font-size: 16px;
}

.radar-wrap {
  max-width: 440px;
  margin: 0 auto 36px;
}

.skill-breakdown {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 10px;
  margin-bottom: 28px;
}

.skill-card {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--paper);
}

.skill-card .skill-name {
  font-size: 14px;
  font-weight: 850;
  color: var(--ink);
  margin-bottom: 8px;
}

.skill-card .bar {
  height: 6px;
  border-radius: 3px;
  background: #e5edf1;
  overflow: hidden;
  margin-bottom: 8px;
}

.skill-card .bar i {
  display: block;
  height: 100%;
  border-radius: 3px;
  transition: width 0.4s ease;
}

.skill-card .score {
  font-size: 14px;
  font-weight: 850;
}

.skill-card .score.high {
  color: var(--green);
}

.skill-card .score.mid {
  color: var(--gold);
}

.skill-card .score.low {
  color: var(--red);
}

.skill-card.hidden {
  display: none;
}

.suggested-path {
  margin-top: 20px;
  padding: 20px 24px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--paper);
}

.paywall-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.92);
  z-index: 5;
  border-radius: 0 0 16px 16px;
}

/* ---------- Paywall (¥9.9 付费卡) ---------- */
.paywall-card {
  max-width: 500px;
  margin: 0 auto;
  padding: 36px 32px;
  border: 1px solid var(--line);
  border-radius: 16px;
  text-align: center;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.paywall-card .price {
  font-size: 56px;
  font-weight: 950;
  color: var(--red);
  line-height: 1;
  margin: 8px 0;
}

.paywall-card .price-unit {
  font-size: 18px;
  font-weight: 850;
  color: var(--muted);
}

.paywall-card .price-desc {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 24px;
}

.pay-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 20px 0;
}

.pay-grid .qr-box {
  background: var(--wash);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  text-align: center;
}

.pay-grid .qr-box img,
.pay-grid .qr-box .qr-placeholder {
  width: 120px;
  height: 120px;
  margin: 0 auto 8px;
  display: block;
  background: var(--paper);
  border-radius: 8px;
}

.pay-grid .qr-box .qr-label {
  font-size: 12px;
  color: var(--muted);
  font-weight: 600;
}

.activate-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: end;
  margin-top: 20px;
}

.activate-row input[type="text"] {
  padding: 12px 16px;
  border: 2px solid var(--line);
  border-radius: 10px;
  font-size: 15px;
  font-family: var(--font);
  color: var(--ink);
  background: var(--wash);
  outline: none;
  transition: border-color 0.2s;
}

.activate-row input[type="text"]:focus {
  border-color: var(--blue);
}

.activate-row input[type="text"]::placeholder {
  color: var(--muted);
}

/* ---------- Splitter (个性定制) ---------- */
.splitter-layout {
  display: flex;
  height: calc(100vh - 120px);
  overflow: hidden;
}

.split-left {
  width: var(--split-pos, 320px);
  overflow-y: auto;
  border-right: 1px solid var(--line);
  flex-shrink: 0;
  background: var(--wash);
  padding: 12px 0;
}

.split-handle {
  width: 4px;
  cursor: col-resize;
  background: var(--line);
  transition: background 0.2s;
  flex-shrink: 0;
  position: relative;
}

.split-handle:hover {
  background: var(--blue);
}

.split-handle::after {
  content: '';
  position: absolute;
  inset: 0 -4px;
}

.split-right {
  flex: 1;
  overflow-y: auto;
  padding: 24px 32px;
  background: var(--paper);
}

/* Tree navigation inside split-left */
.tree-node {
  padding: 8px 12px;
  cursor: pointer;
  border-radius: 8px;
  display: flex;
  align-items: center;
  transition: background 0.15s;
  user-select: none;
}

.tree-node:hover {
  background: #f0f6fa;
}

.tree-node.active {
  background: rgba(36, 88, 207, 0.1);
  color: var(--blue);
}

.tree-node .toggle {
  display: inline-block;
  width: 16px;
  margin-right: 4px;
  text-align: center;
  font-size: 10px;
  color: var(--muted);
  flex-shrink: 0;
}

.tree-node .name {
  font-weight: 850;
  font-size: 13px;
  flex: 1;
}

.tree-node .mastery-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  margin-left: 6px;
  flex-shrink: 0;
}

.tree-children {
  padding-left: 16px;
}

.tree-children.collapsed {
  display: none;
}

/* Module content in split-right */
.mod-content {
  padding: 0;
  max-width: 720px;
}

.mod-content .mod-header {
  margin-bottom: 20px;
}

.mod-content .mod-title {
  font-size: 24px;
  font-weight: 950;
  margin-bottom: 4px;
}

.mod-exercise {
  margin-top: 24px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px 24px;
  background: var(--wash);
}

.mod-exercise .q-text {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 14px;
}

.mod-exercise .q-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.mod-exercise .q-option {
  padding: 12px 16px;
  border: 2px solid var(--line);
  border-radius: 10px;
  background: var(--paper);
  cursor: pointer;
  font-size: 14px;
  font-family: var(--font);
  transition: border-color 0.2s;
  text-align: left;
}

.mod-exercise .q-option:hover {
  border-color: var(--blue);
}

.mod-exercise .q-option.selected {
  border-color: var(--blue);
  background: rgba(36, 88, 207, 0.06);
}

.mod-exercise .q-option.correct {
  border-color: var(--green);
  background: #f0fbf7;
}

.mod-exercise .q-option.wrong {
  border-color: var(--red);
  background: #fff5f6;
}

/* ---------- Dashboard ---------- */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px;
}

.dash-card {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--paper);
  box-shadow: 0 2px 8px rgba(17, 29, 49, 0.04);
  text-align: center;
}

.dash-card .bar {
  height: 8px;
  border-radius: 4px;
  background: #e5edf1;
  overflow: hidden;
  margin: 0 0 10px;
}

.dash-card .bar i {
  display: block;
  height: 100%;
  border-radius: 4px;
  background: var(--blue);
  transition: width 0.4s ease;
}

.dash-card .pct {
  font-size: 24px;
  font-weight: 950;
  line-height: 1;
  margin-bottom: 2px;
}

.dash-card .label {
  font-size: 13px;
  color: var(--muted);
  margin-top: 6px;
  font-weight: 500;
}

.dash-card.red .pct { color: var(--red); }
.dash-card.yellow .pct { color: var(--gold); }
.dash-card.green .pct { color: var(--green); }

.dash-card.red .bar i { background: var(--red); }
.dash-card.yellow .bar i { background: var(--gold); }
.dash-card.green .bar i { background: var(--green); }

/* ---------- Footer ---------- */
.footer {
  background: var(--navy);
  color: #cad6e7;
  padding: 32px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 14px;
}

.footer a {
  color: #97a9c2;
}

.footer a:hover {
  color: #fff;
}

.footer .footer-links {
  display: flex;
  align-items: center;
  gap: 20px;
}

/* ---------- Utility ---------- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 48px 24px;
}

.text-center {
  text-align: center;
}

.mt-0 { margin-top: 0; }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; }
.mt-8 { margin-top: 32px; }
.mb-2 { margin-bottom: 8px; }
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }

/* ---------- Responsive: 980px ---------- */
@media (max-width: 980px) {
  .hero {
    grid-template-columns: 1fr;
    padding: 32px 24px;
    min-height: auto;
    gap: 28px;
  }

  .hero .hero-right {
    order: -1;
  }

  .diag-options {
    grid-template-columns: 1fr;
  }

  .topbar {
    padding: 10px 16px;
  }

  .topbar .tabs {
    gap: 4px;
  }

  .topbar .tab {
    padding: 6px 12px;
    font-size: 13px;
  }

  .splitter-layout {
    flex-direction: column;
    height: auto;
  }

  .split-left {
    width: 100% !important;
    border-right: none;
    border-bottom: 1px solid var(--line);
    max-height: 200px;
  }

  .split-handle {
    display: none;
  }

  .split-right {
    padding: 16px;
  }

  .skill-breakdown {
    grid-template-columns: 1fr 1fr;
  }

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

  .footer {
    padding: 24px 20px;
    flex-direction: column;
    text-align: center;
  }
}

/* ---------- Responsive: 600px ---------- */
@media (max-width: 600px) {
  .hero {
    padding: 24px 16px;
    gap: 20px;
  }

  .hero .hero-card {
    padding: 20px;
  }

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

  .diag-card {
    padding: 20px 16px;
  }

  .diag-card .diag-question {
    font-size: 17px;
  }

  .diag-progress {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .diag-progress .diag-label,
  .diag-progress .diag-step {
    text-align: center;
  }

  .diag-progress .diag-track {
    min-width: auto;
  }

  .skill-breakdown {
    grid-template-columns: 1fr;
  }

  .mod-exercise .q-options {
    grid-template-columns: 1fr;
  }

  .paywall-card {
    padding: 24px 16px;
  }

  .paywall-card .price {
    font-size: 40px;
  }

  .activate-row {
    grid-template-columns: 1fr;
  }

  .topbar .brand .brand-text {
    font-size: 16px;
  }

  .topbar .tabs {
    gap: 2px;
  }

  .topbar .tab {
    padding: 4px 10px;
    font-size: 12px;
  }

  .section {
    padding: 28px 14px;
  }

  .report-lead {
    font-size: 14px;
  }
}

/* ---------- Scrollbar styling ---------- */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 3px;
}

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

/* ---------- Selection ---------- */
::selection {
  background: rgba(36, 88, 207, 0.15);
  color: var(--ink);
}

/* ---------- Animations ---------- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.screen.active {
  animation: fadeIn 0.3s ease forwards;
}

/* ====== OPTION BUTTONS (app.js uses .opt-btn) ====== */
.opt-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper);
  cursor: pointer;
  text-align: left;
  font-size: 15px;
  line-height: 1.45;
  transition: all .12s;
}
.opt-btn:hover { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(36,88,207,.06); }
.opt-btn.correct { border-color: var(--green); background: #f0fbf7; }
.opt-btn.wrong { border-color: var(--red); background: #fff5f6; }
.opt-btn:disabled { opacity: .7; cursor: default; }
.opt-label {
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--wash); color: var(--muted);
  display: grid; place-items: center;
  font-weight: 900; font-size: 13px; flex-shrink: 0;
}
.opt-btn.correct .opt-label { background: var(--green); color: #fff; }
.opt-btn.wrong .opt-label { background: var(--red); color: #fff; }
.opt-text { flex: 1; }

/* ====== DIAGNOSTIC RESULT ====== */
.diag-result { margin-top: 14px; padding: 14px; border-radius: 8px; font-size: 15px; line-height: 1.55; display: none; }
.diag-result.show { display: block; }
.diag-result.ok { background: #f0fbf7; border: 1px solid #bde1d5; color: var(--green); }
.diag-result.no { background: #fff5f6; border: 1px solid #edc5ca; color: var(--red); }
.diag-result .correct-answer { font-weight: 950; }

/* ====== KNOWLEDGE TREE ====== */
.knowledge-tree { padding: 8px 0; font-size: 14px; }
.tree-branch { margin: 2px 0; }
.tree-node { padding: 8px 12px; border-radius: 6px; cursor: pointer; display: flex; align-items: center; gap: 8px; transition: background .1s; }
.tree-node:hover { background: #f0f6fa; }
.tree-leaf.active { background: rgba(36,88,207,.1); color: var(--blue); }
.tree-toggle { width: 16px; text-align: center; font-size: 11px; color: var(--muted); flex-shrink: 0; }
.tree-name { flex: 1; font-weight: 800; }
.tree-book { font-size: 12px; color: var(--muted); }
.tree-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.tree-status { font-size: 11px; font-weight: 800; color: var(--muted); }
.tree-children { padding-left: 20px; }
.tree-children.collapsed { display: none; }

/* ====== SPLITTER ====== */
.splitter-layout {
  display: flex;
  height: calc(100vh - 62px - 60px);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  background: var(--paper);
}
.split-left {
  width: 320px;
  flex-shrink: 0;
  overflow-y: auto;
  border-right: 1px solid var(--line);
}
.split-left .split-header {
  padding: 16px 16px 12px;
  border-bottom: 1px solid var(--line);
  display: flex; align-items: center; justify-content: space-between;
}
.split-left .split-header h3 { margin: 0; font-size: 16px; }
.split-handle {
  width: 4px;
  cursor: col-resize;
  background: var(--line);
  transition: background .15s;
  flex-shrink: 0;
}
.split-handle:hover, .split-handle:active { background: var(--blue); }
.split-right {
  flex: 1;
  overflow-y: auto;
  padding: 24px 28px;
}
.split-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--muted);
  text-align: center;
}

/* ====== SKILL CONTENT ====== */
.skill-content .skill-header { margin-bottom: 20px; }
.skill-content .skill-header h2 { margin: 0 0 8px; font-size: 24px; }
.skill-mastery-bar { display: flex; align-items: center; gap: 12px; margin-bottom: 6px; }
.skill-mastery-bar .bar { flex: 1; height: 6px; }
.skill-mastery-bar .score { font-weight: 900; font-size: 13px; white-space: nowrap; }
.skill-meta { color: var(--muted); font-size: 13px; margin: 0; }
.skill-examples, .skill-practices { margin-top: 24px; }
.skill-examples h3, .skill-practices h3 { font-size: 18px; margin-bottom: 14px; }
.example-card { padding: 16px; border: 1px solid var(--line); border-radius: 8px; background: var(--wash); margin-bottom: 12px; }
.example-card .example-text { margin: 0 0 6px; font-size: 15px; }
.example-card .example-task { color: var(--muted); font-size: 13px; margin: 0 0 8px; }
.example-options { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.example-opt { padding: 4px 10px; border-radius: 4px; background: var(--paper); border: 1px solid var(--line); font-size: 13px; }
.example-answer { font-size: 14px; font-weight: 800; color: var(--green); }
.example-explanation { color: var(--muted); font-size: 13px; line-height: 1.55; margin-top: 6px; }

/* ====== PRACTICE CARDS ====== */
.practice-card { padding: 18px; border: 1px solid var(--line); border-radius: 8px; background: var(--paper); margin-bottom: 14px; }
.practice-card .practice-text { margin: 0 0 4px; font-size: 16px; }
.practice-card .practice-task { color: var(--muted); font-size: 13px; margin: 0 0 12px; }
.practice-options { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.practice-opt {
  padding: 12px 14px; border: 1px solid var(--line); border-radius: 8px;
  background: var(--paper); cursor: pointer; text-align: left;
  font-size: 14px; line-height: 1.4; transition: all .1s;
}
.practice-opt:hover { border-color: var(--blue); }
.practice-opt.correct { border-color: var(--green); background: #f0fbf7; }
.practice-opt.wrong { border-color: var(--red); background: #fff5f6; }
.practice-opt:disabled { opacity: .6; cursor: default; }
.practice-feedback { margin-top: 10px; padding: 12px; border-radius: 6px; font-size: 14px; line-height: 1.5; display: none; }
.practice-feedback.show { display: block; }
.practice-feedback.ok { background: #f0fbf7; border: 1px solid #bde1d5; color: var(--green); }
.practice-feedback.no { background: #fff5f6; border: 1px solid #edc5ca; color: var(--red); }

/* ====== SUGGESTED PATH ====== */
.suggested-path { margin-top: 20px; padding: 20px 24px; border: 1px solid var(--line); border-radius: 10px; background: var(--paper); }
.suggested-path h3 { margin: 0 0 6px; font-size: 18px; }
.path-lead { color: var(--muted); font-size: 14px; margin: 0 0 12px; }
.path-list { display: grid; gap: 6px; }
.path-item { display: flex; align-items: center; gap: 12px; padding: 8px 12px; border-radius: 6px; cursor: pointer; transition: background .1s; }
.path-item:hover { background: #f0f6fa; }
.path-num { width: 22px; height: 22px; border-radius: 50%; background: var(--wash); display: grid; place-items: center; font-size: 11px; font-weight: 900; color: var(--muted); flex-shrink: 0; }
.path-name { flex: 1; font-weight: 800; font-size: 14px; }
.path-score { font-weight: 900; font-size: 13px; }
.path-score.high { color: var(--green); }
.path-score.mid { color: var(--gold); }
.path-score.low { color: var(--red); }

/* ====== DASHBOARD CUSTOM ====== */
.dashboard-grid { display: grid; gap: 14px; }
.dashboard-summary { display: flex; gap: 20px; margin-bottom: 20px; }
.summary-stat { flex: 1; padding: 20px; border: 1px solid var(--line); border-radius: 10px; background: var(--paper); text-align: center; }
.summary-stat strong { display: block; font-size: 36px; font-weight: 950; color: var(--blue); }
.summary-stat span { display: block; color: var(--muted); font-size: 14px; font-weight: 800; margin-top: 4px; }
.book-section { margin-bottom: 20px; }
.book-section-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; padding-bottom: 8px; border-bottom: 1px solid var(--line); }
.book-section-header h3 { margin: 0; font-size: 16px; }
.book-section-header .book-pct { font-weight: 950; font-size: 15px; }
.skill-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px,1fr)); gap: 8px; }
.skill-cards .skill-card { cursor: pointer; }
.skill-cards .skill-card:hover { border-color: var(--blue); }

/* ====== PAYWALL OVERLAY ====== */
.paywall-overlay {
  position: absolute; inset: 0;
  background: rgba(255,255,255,.94);
  backdrop-filter: blur(8px);
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
  z-index: 10;
}

/* Responsive additions */
@media (max-width: 980px) {
  .practice-options { grid-template-columns: 1fr; }
  .splitter-layout { flex-direction: column; height: auto; }
  .split-left { width: 100% !important; max-height: 300px; border-right: 0; border-bottom: 1px solid var(--line); }
  .split-handle { display: none; }
}
@media (max-width: 600px) {
  .summary-stat strong { font-size: 24px; }
  .skill-cards { grid-template-columns: 1fr; }
  .dashboard-summary { flex-direction: column; }
}