:root {
  --ink: #101828;
  --muted: #667085;
  --line: #e4e7ec;
  --soft: #f6f7f9;
  --paper: #fff;
  --brand: #0f172a;
  --brand-soft: #f1f5f9;
  --navy: #111827;
  --green: #12b76a;
  --shadow: 0 16px 44px rgba(16, 24, 40, .08);
  --radius: 8px;
}

* { box-sizing: border-box; }
body { margin: 0; font-family: Inter, Segoe UI, Arial, sans-serif; background: var(--soft); color: var(--ink); }
a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; }

.app-shell { min-height: 100vh; display: grid; grid-template-rows: auto 1fr; }
.topbar { position: sticky; top: 0; z-index: 10; height: 58px; display: flex; align-items: center; gap: 24px; padding: 0 28px; background: #101827; border-bottom: 1px solid rgba(255, 255, 255, 0.1); }
.brand img { height: 30px; display: block; }
.nav { display: flex; align-items: center; gap: 8px; margin-left: 12px; }
.nav button { height: 34px; border: 0; border-radius: var(--radius); background: transparent; color: rgba(255, 255, 255, 0.8); padding: 0 12px; font-weight: 750; cursor: pointer; transition: all 0.2s; }
.nav button:hover { color: #fff; }
.nav button.is-active { background: rgba(255, 255, 255, 0.1); color: #fff; }
.student { margin-left: auto; border: 0; background: transparent; color: rgba(255, 255, 255, 0.7); font-size: 13px; font-weight: 800; cursor: pointer; padding: 8px 10px; border-radius: var(--radius); transition: all 0.2s; }
.student:hover { background: rgba(255, 255, 255, 0.08); color: #fff; }
.logout-button { height: 34px; border: 1px solid rgba(255, 255, 255, 0.2); border-radius: var(--radius); background: transparent; color: #fff; padding: 0 12px; font-weight: 800; cursor: pointer; transition: all 0.2s; }
.logout-button:hover { background: rgba(255, 255, 255, 0.08); border-color: #fff; }

.nav-toggle { display: none; }
.mobile-menu { display: none; }

.workspace { width: min(1240px, calc(100% - 40px)); margin: 0 auto; padding: 28px 0 48px; }
.course-details-shadow-container {
  margin-left: calc(-50vw + 50%);
  margin-right: calc(-50vw + 50%);
  width: 100vw;
  max-width: 100vw;
  display: block;
}
.page-head { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 18px; }
.page-head h1 { margin: 0; font-size: 30px; letter-spacing: -.02em; }
.page-head p { margin: 6px 0 0; color: var(--muted); line-height: 1.5; }
.pill { display: inline-flex; align-items: center; min-height: 24px; border-radius: 999px; padding: 0 10px; background: #ecfdf3; color: #027a48; font-size: 12px; font-weight: 900; }

.student-dashboard { display: grid; grid-template-columns: 1.15fr .85fr; gap: 14px; margin-bottom: 22px; }
.dashboard-main, .dashboard-side, .routine-card { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.dashboard-main { padding: 18px; }
.dashboard-side { padding: 18px; display: grid; gap: 14px; }
.dashboard-head { display: flex; justify-content: space-between; gap: 14px; align-items: start; margin-bottom: 14px; }
.dashboard-head h2, .section-title h2 { margin: 0; font-size: 22px; letter-spacing: -.01em; }
.dashboard-head p, .section-title p { margin: 5px 0 0; color: var(--muted); line-height: 1.45; }
.routine-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.routine-card { padding: 14px; box-shadow: none; }
.routine-card span { display: block; color: var(--muted); font-size: 12px; font-weight: 850; text-transform: uppercase; }
.routine-card strong { display: block; margin-top: 6px; font-size: 16px; line-height: 1.35; }
.routine-card p { margin: 7px 0 0; color: var(--muted); font-size: 13px; line-height: 1.45; }
.progress-bar { height: 10px; overflow: hidden; border-radius: 999px; background: #eef2f7; }
.progress-bar span { display: block; height: 100%; border-radius: inherit; background: var(--brand); }
.checklist, .review-list, .history-list { display: grid; gap: 9px; margin: 0; padding: 0; list-style: none; }
.checklist label { display: flex; align-items: start; gap: 9px; color: #344054; font-size: 13px; line-height: 1.4; }
.review-list li, .history-list li { display: flex; justify-content: space-between; gap: 12px; border-top: 1px solid var(--line); padding-top: 9px; color: #344054; font-size: 13px; }
.review-list b, .history-list b { color: var(--ink); }
.section-title { margin: 8px 0 14px; }
.home-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.course-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; }
.course-card, .panel, .question-card { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.course-card { padding: 18px; display: grid; gap: 12px; }
.course-card h2 { margin: 0; font-size: 20px; }
.course-card p { margin: 0; color: var(--muted); line-height: 1.5; }
.home-course-card { min-height: 172px; padding: 14px; display: grid; align-content: start; gap: 9px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.home-course-card h2 { margin: 0; font-size: 16px; line-height: 1.25; }
.home-course-card p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.4; }
.home-course-card .pill { justify-self: start; min-height: 20px; font-size: 11px; }
.home-course-card .btn { width: 100%; margin-top: auto; }
.material-list { display: grid; gap: 8px; }
.material { display: flex; align-items: center; justify-content: space-between; gap: 12px; border: 1px solid var(--line); border-radius: var(--radius); padding: 10px; }
.material b { font-size: 14px; }
.material span { color: var(--muted); font-size: 12px; }
.btn { min-height: 38px; border: 0; border-radius: var(--radius); padding: 0 14px; font-weight: 850; cursor: pointer; transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1); }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: #1e293b; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(15, 23, 42, 0.15); }
.btn-red { background: var(--brand); color: #fff; text-align: center; display: inline-flex; align-items: center; justify-content: center; }
.btn-red:hover { background: #1e293b; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(15, 23, 42, 0.15); }
.btn-line { background: #fff; border: 1px solid var(--line); color: var(--ink); }
.btn-line:hover { background: #f8fafc; border-color: #cbd5e1; }

.questions-layout { display: grid; grid-template-columns: minmax(240px, 280px) minmax(0, 1fr); gap: 18px; align-items: start; }
.panel { padding: 16px; min-width: 0; overflow: hidden; }
.panel h2 { margin: 0 0 16px; font-size: 18px; }
.filters-toggle { width: 100%; min-height: 52px; border: 0; background: transparent; color: var(--ink); display: grid; grid-template-columns: 1fr auto auto; align-items: center; gap: 10px; padding: 0; margin: 0; font-size: 16px; font-weight: 900; cursor: pointer; text-align: left; }
.filters-toggle small { justify-self: end; min-height: 22px; display: inline-flex; align-items: center; border-radius: 999px; background: var(--soft); color: var(--muted); padding: 0 9px; font-size: 11px; font-weight: 900; }
.filters-toggle::after { content: ""; width: 30px; height: 30px; border-radius: 999px; background: #f2f4f7; box-shadow: inset 0 0 0 1px var(--line); background-image: linear-gradient(45deg, transparent 45%, #344054 45%, #344054 55%, transparent 55%), linear-gradient(-45deg, transparent 45%, #344054 45%, #344054 55%, transparent 55%); background-size: 8px 8px, 8px 8px; background-position: 10px 12px, 14px 12px; background-repeat: no-repeat; transition: transform .18s ease, background-color .18s ease; }
.filters-panel.is-open .filters-toggle { margin-bottom: 16px; }
.filters-panel.is-open .filters-toggle::after { transform: rotate(180deg); background-color: #e2e8f0; }
.filters { display: grid; gap: 14px; min-width: 0; }
.field { display: grid; gap: 7px; min-width: 0; }
.field label, .radio-group span { color: #344054; font-size: 13px; font-weight: 800; }
.field input, .field select { width: 100%; min-width: 0; box-sizing: border-box; height: 38px; border: 1px solid #d0d5dd; border-radius: var(--radius); background: #fff; padding: 0 10px; color: #344054; outline: 0; }
.radio-row { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.radio-row label { display: inline-flex; align-items: center; gap: 7px; color: #344054; font-size: 13px; }
.question-stack { display: grid; gap: 12px; min-width: 0; }
.question-toolbar { display: flex; justify-content: space-between; align-items: center; gap: 12px; color: var(--muted); font-size: 13px; }
.question-counter { color: var(--ink); font-size: 14px; font-weight: 900; }
.question-card { overflow: hidden; }
.question-meta { display: flex; gap: 8px; flex-wrap: wrap; padding: 14px; border-bottom: 1px solid var(--line); }
.question-meta span { background: #f2f4f7; border-radius: 999px; padding: 5px 9px; color: #344054; font-size: 12px; font-weight: 800; }
.question-meta .id { background: #f1f5f9; color: #475569; }
.question-body { padding: 22px; }
.question-body p { margin: 0 0 18px; line-height: 1.65; font-size: 16px; }
.alternatives { display: grid; gap: 12px; margin-bottom: 16px; }
.alternatives label { display: grid; grid-template-columns: auto 1fr; align-items: start; gap: 10px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; padding: 12px; line-height: 1.45; }
.alternatives label.is-correct { background: #ecfdf3; color: #027a48; }
.alternatives label.is-wrong { background: #fff7ed; color: #c2410c; border-color: #ffedd5; }
.question-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 18px; }
.question-actions .btn-primary { min-width: 120px; }
.question-nav { min-height: 38px; border: 1px solid var(--line); border-radius: 999px; background: #fff; color: var(--ink); padding: 0 16px; font-weight: 900; cursor: pointer; }
.question-nav:disabled { opacity: .45; cursor: not-allowed; }
.answer-box { display: none; margin-top: 14px; border-left: 3px solid var(--green); background: #ecfdf3; padding: 12px; color: #064e3b; line-height: 1.5; }
.answer-box.is-visible { display: block; }
.empty { background: #fff; border: 1px dashed #d0d5dd; border-radius: var(--radius); padding: 24px; color: var(--muted); text-align: center; }

.profile-layout { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; align-items: start; }
.profile-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px; }
.profile-card h2 { margin: 0 0 16px; font-size: 20px; }
.profile-card-wide { grid-column: 1 / -1; }
.profile-form { display: grid; gap: 14px; }
.form-message { display: none; margin: 0; padding: 10px 12px; border-radius: var(--radius); font-size: 13px; font-weight: 800; }
.form-message.is-visible { display: block; }
.form-message.is-success { background: #ecfdf3; color: #027a48; }
.form-message.is-error { background: #fff7ed; color: #c2410c; }
.transactions-list { display: grid; gap: 10px; }
.transaction-row { display: grid; grid-template-columns: 1fr auto; gap: 14px; align-items: center; border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; }
.transaction-row h3 { margin: 0; font-size: 16px; }
.transaction-row p { margin: 5px 0 0; color: var(--muted); font-size: 13px; line-height: 1.4; }
.transaction-meta { display: grid; justify-items: end; gap: 6px; text-align: right; }
.transaction-price { font-size: 17px; font-weight: 900; color: var(--ink); }

.course-page { display: grid; gap: 18px; }
.course-hero { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 22px; display: grid; gap: 14px; }
.course-hero h1 { margin: 0; font-size: 30px; letter-spacing: -.02em; }
.course-hero p { margin: 0; color: var(--muted); line-height: 1.5; }
.course-hero-premium { overflow: hidden; position: relative; }
.course-hero-copy { display: grid; gap: 12px; }
.course-status-row { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 13px; font-weight: 800; }
.course-kicker { color: #a94f00 !important; font-size: 12px; font-weight: 950; letter-spacing: .12em; text-transform: uppercase; }
.course-lead { max-width: 640px; font-size: 16px; }
.course-meta-strip { display: flex; flex-wrap: wrap; gap: 10px; }
.course-meta-strip span { min-width: 150px; border: 1px solid var(--line); border-radius: var(--radius); background: #f8fafc; padding: 10px 12px; color: var(--ink); font-size: 14px; font-weight: 850; }
.course-meta-strip b { display: block; margin-bottom: 4px; color: var(--muted); font-size: 10px; font-weight: 950; letter-spacing: .08em; text-transform: uppercase; }
.course-action-panel { display: grid; gap: 10px; align-content: center; border: 1px solid #ffe4b3; border-radius: calc(var(--radius) + 4px); background: linear-gradient(135deg, #fff7e6, #fff); padding: 18px; }
.course-action-panel strong { font-size: 22px; line-height: 1.15; }
.course-action-panel p { font-size: 13px; }
.course-action-label { color: #a94f00; font-size: 11px; font-weight: 950; letter-spacing: .12em; text-transform: uppercase; }
.course-meta-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.course-meta { border: 1px solid var(--line); border-radius: var(--radius); padding: 10px; }
.course-meta span { display: block; color: var(--muted); font-size: 11px; font-weight: 900; text-transform: uppercase; }
.course-meta strong { display: block; margin-top: 4px; font-size: 14px; }
.course-section { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px; }
.course-section h2 { margin: 0 0 14px; font-size: 20px; }
.course-material-grid { display: grid; gap: 10px; }
.course-material-card { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 12px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; padding: 13px 14px; color: var(--ink); }
.course-material-card b { font-size: 14px; }
.course-material-card > span:last-child { color: var(--brand); font-size: 13px; font-weight: 900; }
.course-material-type { display: inline-flex; align-items: center; justify-content: center; width: 42px; height: 28px; border-radius: 999px; background: #f2f4f7; color: #344054; font-size: 11px; font-weight: 950; }
.back-link { color: var(--brand); font-weight: 900; }

.view { display: none; }
.view.is-active { display: block; }

@media (min-width: 900px) {
  .course-page { width: min(1120px, calc(100% - 40px)); }
  .course-hero-premium { grid-template-columns: minmax(0, 1.35fr) minmax(280px, .65fr); gap: 28px; padding: 28px; }
  .course-routine-section .routine-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .course-material-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .course-section { padding: 22px; }
}

@media (max-width: 780px) {
  .topbar { height: 60px; padding: 0 16px; gap: 12px; position: relative; }
  .nav { display: none; }
  .student { display: none; }
  .logout-button { display: none; }
  
  .nav-toggle {
    display: grid;
    place-items: center;
    width: 40px;
    height: 40px;
    margin-left: auto;
    border: 1px solid rgba(255,255,255,.2);
    border-radius: 8px;
    background: rgba(255,255,255,.06);
    padding: 0;
    cursor: pointer;
  }
  .nav-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    background: #fff;
    border-radius: 999px;
    margin: 3px auto;
    transition: all 0.28s ease;
  }
  .nav-toggle.is-active span:nth-child(1) {
    transform: translateY(5px) rotate(45deg);
  }
  .nav-toggle.is-active span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle.is-active span:nth-child(3) {
    transform: translateY(-5px) rotate(-45deg);
  }
  
  .mobile-menu {
    display: none;
    position: absolute;
    top: 58px;
    left: 0;
    width: 100%;
    background: #101827;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: 16px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    z-index: 99;
    flex-direction: column;
    gap: 12px;
  }
  .mobile-menu.is-open {
    display: flex;
  }
  .mobile-menu button {
    width: 100%;
    height: 40px;
    border: 0;
    border-radius: var(--radius);
    background: transparent;
    color: rgba(255, 255, 255, 0.8);
    font-weight: 750;
    text-align: left;
    padding: 0 16px;
    cursor: pointer;
    transition: all 0.2s;
  }
  .mobile-menu button:hover {
    background: rgba(255, 255, 255, 0.06);
    color: #fff;
  }
  .mobile-menu button.is-active {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
  }
  
  .workspace { width: min(100% - 24px, 1240px); padding-top: 18px; }
  .page-head { display: grid; }
  .home-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .student-dashboard { grid-template-columns: 1fr; }
  .routine-grid { grid-template-columns: 1fr; }
  .course-meta-grid { grid-template-columns: 1fr 1fr; }
  .questions-layout { grid-template-columns: 1fr; }
  .filters-panel .filters { display: none; }
  .filters-panel.is-open .filters { display: grid; }
  .question-toolbar { align-items: flex-start; flex-direction: column; }
  .question-actions { display: grid; grid-template-columns: 1fr 1fr; }
  .question-actions .btn-primary { grid-column: 1 / -1; width: 100%; }
  .question-nav { width: 100%; }
  .profile-layout { grid-template-columns: 1fr; }
   .transaction-row { grid-template-columns: 1fr; }
  .transaction-meta { justify-items: start; text-align: left; }
  .course-details-grid { grid-template-columns: 1fr !important; }
}

@media (max-width: 520px) {
  .home-grid { grid-template-columns: 1fr; }
  .course-meta-grid { grid-template-columns: 1fr; }
}

/* Shop and Available Courses Vitrine - Minimalist Premium */
.shop-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 20px;
  margin-top: 16px;
}
.shop-course-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 4px 20px rgba(16, 24, 40, 0.02);
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.shop-course-card:hover {
  transform: translateY(-2px);
  border-color: #d0d5dd;
  box-shadow: 0 10px 32px rgba(16, 24, 40, 0.06);
}
.shop-course-card .pill {
  align-self: flex-start;
  background: var(--brand-soft);
  color: var(--brand);
  font-weight: 850;
  font-size: 11px;
}
.shop-course-card h2 {
  margin: 0;
  font-size: 18px;
  font-weight: 800;
  color: var(--ink);
  line-height: 1.35;
}
.shop-course-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.5;
}
.shop-course-card .card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  border-top: 1px solid var(--line);
  padding-top: 16px;
  gap: 12px;
}
.shop-course-card .price {
  display: flex;
  flex-direction: column;
}
.shop-course-card .price strong {
  font-size: 20px;
  font-weight: 900;
  color: var(--ink);
  white-space: nowrap;
}
.shop-course-card .price span {
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  font-weight: 700;
}
.shop-course-card .actions {
  display: flex;
  gap: 8px;
}
.shop-course-card .btn {
  min-height: 36px;
  font-size: 13px;
  padding: 0 16px;
}

#noCoursesAlert {
  background: #fafafa;
  border: 1px solid var(--line);
  border-left: 4px solid var(--brand);
  padding: 16px 20px;
  border-radius: 12px;
  margin-bottom: 32px;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.5;
  box-shadow: 0 4px 12px rgba(16, 24, 40, 0.02);
}
#noCoursesAlert strong {
  color: var(--ink);
  font-weight: 800;
}