@import url('https://fonts.googleapis.com/css2?family=Barlow+Condensed:wght@500;600;700;800&family=Libre+Caslon+Display&family=Libre+Caslon+Text:wght@400;700&display=swap');

/* ============================================================
   DatosLab: Design System
   Tokens defined in the blueprint (Section 10.4).
   Static-first; GitHub Pages-deployable.
============================================================ */

:root {
  /* Color, pulled from the DatosLab infinity mockup */
  --color-brown: #33251C;
  --color-cream: #FFF9F0;
  --color-teal: #086E73;
  --color-orange: #D76335;
  --color-gold: #D9A441;
  --color-green: #6F8F4E;
  --color-primary: var(--color-teal);
  --color-primary-hover: #064F55;
  --color-text: #33251C;
  --color-text-muted: #725F4E;
  --color-text-faint: #A78E78;
  --color-bg: #FFF9F0;
  --color-surface: rgba(255, 249, 240, 0.88);
  --color-surface-alt: rgba(255, 253, 248, 0.92);
  --color-border: rgba(51, 37, 28, 0.18);
  --color-success: #6F8F4E;
  --color-warning: #D9A441;
  --color-error: #A12C7B;
  --color-on-primary: #FFFFFF;
  --gradient-page:
    radial-gradient(circle at 84% 6%, rgba(217, 164, 65, 0.24) 0, transparent 30%),
    radial-gradient(circle at 10% 28%, rgba(8, 110, 115, 0.10) 0, transparent 24%),
    linear-gradient(180deg, #FFF9F0 0%, #F8E9C8 46%, #FFF9F0 100%);
  --gradient-button: linear-gradient(135deg, #086E73 0%, #0B8788 52%, #6F8F4E 100%);
  --gradient-button-warm: linear-gradient(135deg, #086E73 0%, #D9A441 58%, #D76335 100%);
  --gradient-hero:
    radial-gradient(circle at 16% 20%, rgba(8, 110, 115, 0.28) 0, transparent 28%),
    radial-gradient(circle at 88% 24%, rgba(217, 164, 65, 0.20) 0, transparent 30%),
    linear-gradient(135deg, #33251C 0%, #2B1F18 68%, #4B3426 100%);

  /* Typography */
  --font-display: "Libre Caslon Display", "Libre Caslon Text", Georgia, serif;
  --font-body: "Libre Caslon Text", Georgia, serif;
  --font-ui: "General Sans", "Satoshi", "Inter", system-ui, -apple-system, sans-serif;
  --font-condensed: "Barlow Condensed", "Arial Narrow", "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* Type scale */
  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 16px;
  --text-md: 18px;
  --text-lg: 20px;
  --text-xl: 24px;
  --text-2xl: 32px;
  --text-3xl: 44px;
  --text-hero: 56px;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;

  /* Radii */
  --radius-card: 24px;
  --radius-md: 18px;
  --radius-button: 999px;
  --radius-pill: 999px;

  /* Shadow */
  --shadow-sm: 0 1px 2px rgba(51, 37, 28, 0.08), 0 1px 3px rgba(51, 37, 28, 0.10);
  --shadow-md: 0 10px 28px rgba(51, 37, 28, 0.14), 0 3px 8px rgba(51, 37, 28, 0.08);
  --shadow-lg: 0 18px 48px rgba(51, 37, 28, 0.20);

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 760px;
  --header-h: 64px;

  /* Motion */
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --dur-fast: 140ms;
  --dur: 220ms;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.58;
  color: var(--color-text);
  background: var(--gradient-page);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
img, svg, video { display: block; max-width: 100%; height: auto; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: transparent; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-hover); }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 4px;
}
input, textarea, select { font-family: var(--font-ui); font-size: inherit; color: inherit; }
ul, ol { list-style: none; }

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 0.98;
  letter-spacing: -0.025em;
  color: var(--color-text);
}
h1 { font-size: clamp(42px, 7vw, 74px); }
h2 { font-size: clamp(34px, 4.5vw, 52px); }
h3, h4, h5, h6 {
  font-family: var(--font-ui);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.02em;
}
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-md); }
.eyebrow {
  font-family: var(--font-condensed);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

/* Layout primitives */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-5);
}
.container-narrow {
  width: 100%;
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: 0 var(--space-5);
}
main { flex: 1; }
.section { padding: var(--space-8) 0; }
.section-tight { padding: var(--space-7) 0; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 12px 20px;
  border-radius: var(--radius-button);
  font-family: var(--font-condensed);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.045em;
  text-transform: uppercase;
  line-height: 1;
  min-height: 44px;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur-fast) var(--ease);
  white-space: nowrap;
  user-select: none;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary {
  background: var(--gradient-button);
  color: var(--color-on-primary);
  box-shadow: 0 10px 22px rgba(8, 110, 115, 0.22);
}
.btn-primary:hover {
  background: var(--gradient-button-warm);
  color: var(--color-on-primary);
  box-shadow: 0 14px 28px rgba(51, 37, 28, 0.24);
}
.btn-secondary {
  background: rgba(255, 249, 240, 0.72);
  color: var(--color-text);
  border: 1px solid rgba(51, 37, 28, 0.22);
  box-shadow: 0 6px 18px rgba(51, 37, 28, 0.08);
}
.btn-secondary:hover { border-color: rgba(51, 37, 28, 0.38); background: rgba(255, 249, 240, 0.94); }
.btn-ghost { background: transparent; color: var(--color-text); padding: 8px 12px; min-height: 36px; }
.btn-ghost:hover { background: var(--color-surface); }
.btn-block { width: 100%; }
.btn-sm { padding: 8px 14px; min-height: 36px; font-size: var(--text-xs); }
.btn-lg { padding: 16px 28px; min-height: 52px; font-size: var(--text-base); }
.btn:disabled, .btn[aria-disabled="true"] {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none !important;
}

/* Pills/Tags */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-family: var(--font-condensed);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.045em;
  text-transform: uppercase;
  line-height: 1.2;
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.pill-subject-data-analysis { background: rgba(8, 110, 115, 0.13); color: #064F55; border-color: rgba(8, 110, 115, 0.24); }
.pill-subject-data-visualization { background: rgba(217, 164, 65, 0.20); color: #6A4014; border-color: rgba(217, 164, 65, 0.38); }
.pill-subject-data-engineering { background: rgba(111, 143, 78, 0.18); color: #39522B; border-color: rgba(111, 143, 78, 0.32); }
.pill-duration { background: var(--color-surface-alt); border-color: var(--color-border); color: var(--color-text-muted); }
.pill-status-pending { background: #F5EBD9; color: #7A5612; border-color: #E1CB94; }
.pill-status-under-review { background: #E8EEF5; color: #2A4D7A; border-color: #B7C8DC; }
.pill-status-approved { background: #E2EFDB; color: #2D571B; border-color: #B6D2A4; }
.pill-status-needs-revision { background: #F5E2EE; color: #7C2B5B; border-color: #DBB5CE; }
.pill-free { background: #E2EFDB; color: #2D571B; border-color: #B6D2A4; }

/* Card */
.card {
  background: rgba(255, 249, 240, 0.78);
  border: 1.5px solid rgba(51, 37, 28, 0.28);
  border-radius: var(--radius-card);
  padding: var(--space-5);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.card-interactive { cursor: pointer; }
.card-interactive:hover { border-color: var(--color-teal); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.card-flush { padding: 0; overflow: hidden; }

/* Grids */
.grid { display: grid; gap: var(--space-5); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* Forms */
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: var(--space-4); }
.field label { font-family: var(--font-ui); font-size: var(--text-sm); font-weight: 600; color: var(--color-text); }
.field .help { font-family: var(--font-ui); font-size: var(--text-xs); color: var(--color-text-muted); }
.input, .textarea, .select {
  width: 100%;
  padding: 10px 12px;
  border-radius: var(--radius-button);
  border: 1px solid var(--color-border);
  background: var(--color-surface-alt);
  font-size: var(--text-sm);
  min-height: 44px;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.input:focus, .textarea:focus, .select:focus { border-color: var(--color-primary); background: #FFF; outline: none; }
.textarea { min-height: 120px; resize: vertical; padding: 12px; line-height: 1.55; }
.checkbox-row { display: flex; align-items: flex-start; gap: 10px; padding: var(--space-2) 0; }
.checkbox-row input[type="checkbox"] { margin-top: 4px; min-width: 18px; min-height: 18px; accent-color: var(--color-primary); }

/* Progress bar */
.progress {
  width: 100%;
  height: 8px;
  background: var(--color-border);
  border-radius: var(--radius-pill);
  overflow: hidden;
}
.progress > span {
  display: block;
  height: 100%;
  background: var(--color-primary);
  border-radius: var(--radius-pill);
  transition: width var(--dur) var(--ease);
}

/* Divider */
.divider { height: 1px; background: var(--color-border); margin: var(--space-6) 0; border: 0; }

/* Utility */
.muted { color: var(--color-text-muted); }
.faint { color: var(--color-text-faint); }
.tnum { font-variant-numeric: tabular-nums lining-nums; }
.mono { font-family: var(--font-mono); }
.flex { display: flex; }
.flex-col { display: flex; flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mt-6 { margin-top: var(--space-6); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-5 { margin-bottom: var(--space-5); }
.text-sm { font-size: var(--text-sm); }
.text-xs { font-size: var(--text-xs); }
.text-muted { color: var(--color-text-muted); }
.hidden { display: none !important; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* Skip link */
.skip-link {
  position: absolute;
  left: 0;
  top: -40px;
  background: var(--color-text);
  color: var(--color-on-primary);
  padding: 8px 12px;
  z-index: 1000;
  border-radius: 0 0 6px 0;
}
.skip-link:focus { top: 0; color: var(--color-on-primary); }

/* Header / Topnav */
.topnav {
  position: sticky;
  top: 0;
  background: rgba(255, 249, 240, 0.92);
  backdrop-filter: saturate(140%) blur(12px);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 50;
  height: var(--header-h);
}
.topnav .inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-5);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: var(--text-md);
  letter-spacing: -0.01em;
}
.brand:hover { color: var(--color-text); }
.brand svg { color: var(--color-primary); }
.brand-stack { display: inline-flex; flex-direction: column; gap: 1px; line-height: 1; }
.brand-word { font-family: var(--font-ui); font-weight: 700; letter-spacing: -0.015em; }
.brand-kicker {
  font-family: var(--font-condensed);
  color: var(--color-text-muted);
  font-size: 8px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}
.nav-links a {
  font-family: var(--font-ui);
  color: var(--color-text);
  padding: 8px 12px;
  border-radius: var(--radius-button);
  font-size: var(--text-sm);
  font-weight: 500;
}
.nav-links a:hover { background: var(--color-surface); }
.nav-links a.is-active { background: var(--color-surface); color: var(--color-text); }
.nav-divider { width: 1px; height: 20px; background: var(--color-border); margin: 0 6px; }
.avatar-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border-radius: 999px;
  background: var(--gradient-button);
  color: var(--color-on-primary);
  font-weight: 600;
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  position: relative;
}
.avatar-menu {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  min-width: 200px;
  padding: 6px;
  box-shadow: var(--shadow-md);
  z-index: 60;
}
.avatar-menu a, .avatar-menu button {
  display: block;
  width: 100%;
  text-align: left;
  padding: 8px 10px;
  border-radius: 4px;
  font-size: var(--text-sm);
  color: var(--color-text);
}
.avatar-menu a:hover, .avatar-menu button:hover { background: var(--color-bg); }
.avatar-menu .meta { padding: 8px 10px; font-size: var(--text-xs); color: var(--color-text-muted); }

/* Mobile nav toggle */
.menu-toggle { display: none; }
@media (max-width: 720px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: var(--space-3);
    gap: var(--space-1);
  }
  .nav-links.open a { padding: 12px; }
  .menu-toggle { display: inline-flex; align-items: center; justify-content: center; padding: 8px; margin-left: auto; }
}

/* Footer */
.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-7) 0 var(--space-6);
  background: rgba(255, 249, 240, 0.94);
  margin-top: var(--space-8);
}
.footer .row { display: flex; flex-wrap: wrap; gap: var(--space-6); justify-content: space-between; align-items: flex-start; }
.footer .col { display: flex; flex-direction: column; gap: var(--space-2); }
.footer .col h5 { font-family: var(--font-condensed); font-size: 14px; text-transform: uppercase; letter-spacing: 0.11em; color: var(--color-text-muted); font-weight: 700; }
.footer a { color: var(--color-text); font-family: var(--font-ui); font-size: var(--text-sm); }
.footer a:hover { color: var(--color-primary); }
.footer .legal { color: var(--color-text-muted); font-size: var(--text-xs); margin-top: var(--space-6); }

/* Hero */
.hero {
  background: var(--gradient-hero);
  color: #F5F4F0;
  padding: var(--space-9) 0 var(--space-8);
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid rgba(51, 37, 28, 0.28);
}
.hero::after {
  content: "";
  position: absolute;
  inset: auto var(--space-5) var(--space-5) auto;
  width: min(360px, 46vw);
  height: 180px;
  border: 1px solid rgba(255, 249, 240, 0.22);
  border-radius: 999px;
  pointer-events: none;
  transform: rotate(-5deg);
}
.hero h1 {
  color: #F5F4F0;
  font-size: clamp(54px, 8.8vw, 104px);
  letter-spacing: -0.045em;
  max-width: 12ch;
}
.hero .sub {
  color: #E8DED2;
  font-size: 20px;
  max-width: 52ch;
  margin-top: var(--space-4);
}
.hero .cta-row { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-6); }
.hero .btn-secondary { color: #FFF9F0; border-color: rgba(255,249,240,0.34); background: rgba(255,249,240,0.08); }
.hero .btn-secondary:hover { background: rgba(255,249,240,0.16); border-color: #FFF9F0; }

/* Skeleton / Empty */
.empty-state {
  text-align: center;
  padding: var(--space-7) var(--space-5);
  color: var(--color-text-muted);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-card);
}
.empty-state h4 { color: var(--color-text); margin-bottom: var(--space-2); }

/* Tables */
.table { width: 100%; border-collapse: collapse; font-family: var(--font-ui); font-size: var(--text-sm); }
.table th, .table td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--color-border); }
.table thead th {
  background: var(--color-surface-alt);
  font-family: var(--font-condensed);
  font-weight: 700;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
}
.table tbody tr:hover { background: var(--color-surface-alt); }

/* Badge / notice */
.notice {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-surface);
  align-items: flex-start;
  font-size: var(--text-sm);
}
.notice-info { border-color: #B5C9CD; background: #E8F0EE; }

/* Mock banner, signals this is a prototype */
.mock-banner {
  background: #F5EBD9;
  border-bottom: 1px solid #E1CB94;
  color: #7A5612;
  font-size: var(--text-xs);
  padding: 6px var(--space-5);
  text-align: center;
}
.mock-banner strong { font-weight: 600; }
.mock-banner a { color: #7A5612; text-decoration: underline; }

/* Accordion */
.accordion-item { border: 1px solid var(--color-border); border-radius: var(--radius-card); margin-bottom: var(--space-2); background: var(--color-surface); overflow: hidden; }
.accordion-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  cursor: pointer;
  font-weight: 500;
  list-style: none;
  gap: var(--space-3);
}
.accordion-summary::-webkit-details-marker { display: none; }
.accordion-summary .chev { transition: transform var(--dur) var(--ease); }
.accordion-item[open] .chev { transform: rotate(90deg); }
.accordion-content { padding: 0 var(--space-4) var(--space-4); }
.lesson-row { display: flex; align-items: center; gap: var(--space-3); padding: 8px 0; border-top: 1px solid var(--color-border); font-size: var(--text-sm); }
.lesson-row:first-child { border-top: 0; }
.lesson-row .idx { color: var(--color-text-faint); width: 22px; font-variant-numeric: tabular-nums; }
.lesson-row .title { flex: 1; }
.lesson-row .meta { color: var(--color-text-muted); font-size: var(--text-xs); }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

/* --- Data tables (dashboard, admin) --- */
.data-table { width: 100%; border-collapse: collapse; font-family: var(--font-ui); font-size: var(--text-sm); }
.data-table th, .data-table td { padding: 12px var(--space-4); text-align: left; border-bottom: 1px solid var(--color-border); vertical-align: top; }
.data-table thead th { background: var(--color-surface); font-family: var(--font-condensed); font-weight: 700; color: var(--color-text-muted); font-size: 14px; text-transform: uppercase; letter-spacing: 0.08em; }
.data-table tbody tr:last-child td { border-bottom: 0; }
.data-table tbody tr:hover { background: var(--color-surface); }

/* --- KPI tiles --- */
.kpi { padding: var(--space-5); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); }
.kpi .label { font-family: var(--font-condensed); font-size: 14px; text-transform: uppercase; letter-spacing: 0.11em; color: var(--color-text-muted); font-weight: 700; }
.kpi .value { font-family: var(--font-display); font-size: var(--text-2xl); font-weight: 400; color: var(--color-text); margin-top: 6px; line-height: 1; }
.kpi .delta { font-size: var(--text-xs); color: var(--color-text-muted); margin-top: 6px; }

/* --- Certificate frame --- */
.cert-frame {
  background: linear-gradient(135deg, #FFFFFF 0%, #F9F8F5 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-8) var(--space-7);
  position: relative;
  box-shadow: var(--shadow-md);
}
.cert-frame::before {
  content: ""; position: absolute; inset: 12px; border: 1px solid var(--color-primary); border-radius: 8px; opacity: 0.25; pointer-events: none;
}
.cert-frame .cert-eyebrow { font-family: var(--font-condensed); letter-spacing: 0.16em; text-transform: uppercase; font-size: 15px; color: var(--color-primary); font-weight: 700; }
.cert-frame .cert-name { font-family: var(--font-display); font-size: var(--text-2xl); font-weight: 400; margin: var(--space-4) 0 var(--space-2); }
.cert-frame .cert-path { font-size: var(--text-lg); color: var(--color-text); margin: var(--space-3) 0; }
.cert-frame .cert-signature { display: flex; gap: var(--space-6); margin-top: var(--space-6); flex-wrap: wrap; }
.cert-frame .cert-signature .sig { font-family: 'Caveat', 'Brush Script MT', cursive; font-size: 28px; color: var(--color-primary); border-bottom: 1px solid var(--color-border); padding-bottom: 6px; min-width: 200px; }
.cert-frame .cert-signature .sig-label { font-size: var(--text-xs); color: var(--color-text-muted); margin-top: 4px; text-transform: uppercase; letter-spacing: 0.08em; }

/* --- Tabs --- */
.tabs { display: flex; gap: 2px; border-bottom: 1px solid var(--color-border); margin-bottom: var(--space-5); flex-wrap: wrap; }
.tab { padding: 10px var(--space-3); background: transparent; color: var(--color-text-muted); font-family: var(--font-ui); font-weight: 600; font-size: var(--text-sm); border-bottom: 2px solid transparent; margin-bottom: -1px; cursor: pointer; }
.tab.is-active { color: var(--color-text); border-bottom-color: var(--color-primary); }
.tab:hover { color: var(--color-text); }

/* --- File-drop mock --- */
.file-drop {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-7);
  text-align: center;
  background: var(--color-surface);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.file-drop.is-drag { border-color: var(--color-primary); background: #E8F0EE; }
.file-drop .file-icon { font-size: 28px; color: var(--color-primary); margin-bottom: var(--space-2); }
.file-drop .file-name { font-weight: 600; margin-top: var(--space-3); }
.file-drop .file-meta { color: var(--color-text-muted); font-size: var(--text-xs); margin-top: 4px; }

/* --- Gamification primitives --- */
.skill-map {
  display: grid;
  grid-template-columns: repeat(6, minmax(130px, 1fr));
  gap: var(--space-4);
  position: relative;
}
.skill-map::before {
  content: "";
  position: absolute;
  left: 7%;
  right: 7%;
  top: 34px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-teal), var(--color-gold), var(--color-green));
  opacity: 0.36;
}
.skill-node {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  min-height: 240px;
  padding: var(--space-4);
  border: 1.5px solid rgba(51, 37, 28, 0.25);
  border-radius: var(--radius-card);
  background: rgba(255, 249, 240, 0.86);
  box-shadow: var(--shadow-sm);
}
.skill-node h3, .badge-card h3, .milestone h3 { font-size: var(--text-lg); }
.skill-node-orb {
  width: 68px;
  height: 68px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: 32px;
  color: var(--color-cream);
  background: var(--color-brown);
  border: 5px solid var(--color-cream);
  box-shadow: 0 0 0 1.5px rgba(51, 37, 28, 0.25), var(--shadow-sm);
}
.skill-node-complete .skill-node-orb { background: var(--gradient-button); }
.skill-node-active {
  border-color: rgba(8, 110, 115, 0.48);
  box-shadow: 0 14px 34px rgba(8, 110, 115, 0.13);
}
.skill-node-active .skill-node-orb { background: var(--gradient-button-warm); }
.skill-node-locked {
  opacity: 0.72;
  background: rgba(255, 249, 240, 0.58);
}
.badge-grid {
  display: grid;
  gap: var(--space-3);
}
.badge-card {
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: var(--space-4);
  align-items: start;
  padding: var(--space-4);
  border: 1.5px solid rgba(51, 37, 28, 0.24);
  border-radius: var(--radius-card);
  background: rgba(255, 249, 240, 0.78);
}
.badge-card.is-earned {
  border-color: rgba(8, 110, 115, 0.42);
}
.badge-card.is-locked {
  opacity: 0.70;
}
.badge-medal {
  width: 54px;
  height: 54px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  font-family: var(--font-condensed);
  font-size: 24px;
  font-weight: 800;
  color: var(--color-cream);
  background: var(--gradient-button);
}
.badge-card.is-locked .badge-medal {
  background: transparent;
  color: var(--color-text-muted);
  border: 1.5px dashed rgba(51, 37, 28, 0.36);
}
.milestone-track {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  position: relative;
}
.milestone-track::before {
  content: "";
  position: absolute;
  left: 25px;
  top: 28px;
  bottom: 28px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-teal), var(--color-gold), rgba(51, 37, 28, 0.18));
  opacity: 0.55;
}
.milestone {
  position: relative;
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: var(--space-4);
  padding: var(--space-4);
  border: 1.5px solid rgba(51, 37, 28, 0.24);
  border-radius: var(--radius-card);
  background: rgba(255, 249, 240, 0.80);
}
.milestone-marker {
  position: relative;
  z-index: 1;
  width: 52px;
  height: 52px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  font-family: var(--font-condensed);
  font-size: 18px;
  font-weight: 800;
  color: var(--color-text);
  background: var(--color-cream);
  border: 1.5px solid rgba(51, 37, 28, 0.28);
}
.milestone-complete .milestone-marker {
  background: var(--color-teal);
  color: var(--color-cream);
}
.milestone-active {
  border-color: rgba(217, 164, 65, 0.54);
  box-shadow: 0 14px 34px rgba(217, 164, 65, 0.13);
}
.milestone-active .milestone-marker {
  background: var(--color-gold);
}
.milestone-locked {
  opacity: 0.72;
}

@media (max-width: 1100px) {
  .skill-map { grid-template-columns: repeat(3, 1fr); }
  .skill-map::before { display: none; }
}
@media (max-width: 640px) {
  .skill-map { grid-template-columns: 1fr; }
  .badge-card, .milestone { grid-template-columns: 1fr; }
  .milestone-track::before { display: none; }
}