/* ============================================
   Scroll Solutions Studio — global styles
   ============================================ */

:root {
  /* Digital */
  --color-primary: #1e5a8a;
  --color-primary-dark: #143d5c;
  --color-accent: #0ea5e9;
  /* Physical / architectural */
  --color-slate-900: #0f172a;
  --color-slate-700: #334155;
  --color-slate-500: #64748b;
  --color-surface: #f4f1ec;
  --color-surface-alt: #e8e4dc;
  --color-wood: #b8956c;
  --color-white: #ffffff;
  /* Typography */
  --font-sans: "Inter", "Noto Sans TC", system-ui, sans-serif;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-hero: clamp(1.75rem, 4vw, 2.75rem);
  --text-hero-sub: clamp(1rem, 2.2vw, 1.25rem);
  /* Layout */
  --container: 72rem;
  --header-h: 4.25rem;
  --radius: 12px;
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 12px 40px rgba(15, 23, 42, 0.1);
  --shadow-card-hover: 0 20px 48px rgba(15, 23, 42, 0.14);
  --transition: 0.25s ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-slate-900);
  background: var(--color-surface);
}

/* Offset in-page targets for sticky header */
main .section,
.page-hero {
  scroll-margin-top: calc(var(--header-h) + 0.5rem);
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--color-accent);
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

.container.narrow {
  max-width: 44rem;
}

.center {
  text-align: center;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  z-index: 100;
  padding: 0.75rem 1rem;
  background: var(--color-slate-900);
  color: var(--color-white);
  font-weight: 600;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

/* ----- Header ----- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  min-height: var(--header-h);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(30, 90, 138, 0.12);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1rem;
  padding-block: 0.75rem;
}

.logo {
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-slate-900);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.logo:hover {
  color: var(--color-primary);
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
  justify-content: center;
}

.nav-list a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-slate-700);
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.nav-list a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-wood);
}

.nav-list a[aria-current="page"] {
  color: var(--color-primary-dark);
  border-bottom-color: var(--color-primary);
  font-weight: 600;
}

.lang-switch {
  display: flex;
  border-radius: 999px;
  padding: 3px;
  background: var(--color-surface-alt);
  border: 1px solid rgba(15, 23, 42, 0.08);
}

.lang-btn {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.4rem 0.85rem;
  border: none;
  border-radius: 999px;
  background: transparent;
  color: var(--color-slate-500);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.lang-btn[aria-pressed="true"] {
  background: var(--color-white);
  color: var(--color-primary-dark);
  box-shadow: var(--shadow-sm);
}

.lang-btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Mobile menu toggle (injected by script.js; hidden on wide viewports) */
.nav-toggle {
  display: none;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  margin-left: auto;
  padding: 0;
  border: 1px solid rgba(15, 23, 42, 0.12);
  border-radius: 10px;
  background:
    linear-gradient(currentColor, currentColor) 50% calc(50% - 5px) / 1.1rem 2px no-repeat,
    linear-gradient(currentColor, currentColor) 50% 50% / 1.1rem 2px no-repeat,
    linear-gradient(currentColor, currentColor) 50% calc(50% + 5px) / 1.1rem 2px no-repeat,
    var(--color-surface-alt);
  color: var(--color-slate-900);
  cursor: pointer;
  transition: background-color var(--transition), border-color var(--transition);
}

.nav-toggle:hover {
  border-color: rgba(30, 90, 138, 0.25);
  background-color: var(--color-white);
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ----- Sections ----- */
.section {
  padding-block: clamp(3rem, 8vw, 5rem);
}

.section--alt {
  background: linear-gradient(180deg, #ebe7e0 0%, var(--color-surface) 100%);
}

.section-head {
  margin-bottom: 2rem;
  max-width: 48rem;
}

.section-title {
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-primary-dark);
  letter-spacing: -0.02em;
  line-height: 1.25;
}

/* ----- Hero ----- */
.hero {
  position: relative;
  padding-block: clamp(4rem, 12vw, 7rem);
  background:
    radial-gradient(ellipse 120% 80% at 70% 0%, rgba(14, 165, 233, 0.12), transparent 50%),
    radial-gradient(ellipse 80% 60% at 10% 100%, rgba(184, 149, 108, 0.18), transparent 45%),
    linear-gradient(165deg, #f8fafc 0%, var(--color-surface) 55%, #e2e8f0 100%);
  border-bottom: 1px solid rgba(15, 23, 42, 0.06);
}

.hero-inner {
  max-width: 52rem;
}

.hero-title {
  margin: 0 0 1rem;
  font-size: var(--text-hero);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-slate-900);
}

.hero-lead {
  margin: 0 0 2rem;
  font-size: var(--text-hero-sub);
  color: var(--color-slate-700);
  max-width: 40rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

.btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: var(--text-base);
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius);
  text-decoration: none;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  box-shadow: 0 4px 16px rgba(30, 90, 138, 0.35);
}

.btn-primary:hover {
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(30, 90, 138, 0.4);
}

.btn-secondary {
  background: var(--color-white);
  color: var(--color-primary-dark);
  border: 2px solid rgba(30, 90, 138, 0.35);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--color-primary-dark);
  border: 2px solid rgba(30, 90, 138, 0.35);
}

.btn-ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-footer {
  background: transparent;
  color: #e0f2fe;
  border: 2px solid rgba(125, 211, 252, 0.5);
  margin-bottom: 1.5rem;
}

.btn-footer:hover {
  color: #fff;
  border-color: #bae6fd;
}

/* ----- Prose ----- */
.prose p {
  margin: 0;
  font-size: var(--text-lg);
  color: var(--color-slate-700);
}

.prose-stack p + p {
  margin-top: 1.1rem;
}

.text-link {
  font-weight: 600;
  text-decoration: none;
  color: var(--color-primary);
}

.text-link:hover {
  text-decoration: underline;
  color: var(--color-accent);
}

/* ----- Inner pages ----- */
.page-hero {
  padding-bottom: 0;
}

.page-eyebrow {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.page-title {
  margin: 0 0 1rem;
  font-size: clamp(1.75rem, 3.5vw, 2.35rem);
  font-weight: 700;
  color: var(--color-slate-900);
  line-height: 1.2;
}

.page-lead {
  margin: 0;
  font-size: var(--text-lg);
  color: var(--color-slate-700);
  max-width: 40rem;
}

/* ----- Hub cards (home + services) ----- */
.hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr));
  gap: clamp(1rem, 3vw, 1.75rem);
  margin-top: 1.5rem;
}

.hub-card {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding: clamp(1.25rem, 3vw, 1.75rem);
  background: var(--color-white);
  border-radius: var(--radius);
  border: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  color: inherit;
  transition: transform var(--transition), box-shadow var(--transition);
}

.hub-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
  color: inherit;
}

.hub-card-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.hub-card-title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary-dark);
}

.hub-card-desc {
  font-size: 0.95rem;
  color: var(--color-slate-700);
  flex: 1;
  line-height: 1.55;
}

.hub-card-cta {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: 0.25rem;
}

.hub-card:hover .hub-card-cta {
  color: var(--color-accent);
}

/* ----- Pull quote ----- */
.pullquote {
  margin: 0;
  padding: clamp(1.5rem, 4vw, 2.25rem);
  background: var(--color-white);
  border-radius: var(--radius);
  border-left: 4px solid var(--color-wood);
  box-shadow: var(--shadow-sm);
}

.pullquote p {
  margin: 0 0 1rem;
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-slate-900);
  line-height: 1.45;
}

.pullquote footer {
  margin: 0;
  font-size: var(--text-base);
}

.pullquote footer a {
  font-weight: 600;
}

/* ----- Detail pages (schools / SMEs) ----- */
.detail-block {
  margin-bottom: 2.5rem;
  padding: clamp(1.25rem, 3vw, 2rem);
  background: var(--color-white);
  border-radius: var(--radius);
  border: 1px solid rgba(15, 23, 42, 0.06);
  box-shadow: var(--shadow-sm);
}

.detail-block-title {
  margin: 0 0 1rem;
  font-size: var(--text-2xl);
  color: var(--color-primary-dark);
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-wood);
}

.detail-block--highlight {
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.06), rgba(184, 149, 108, 0.1));
  border-left: 4px solid var(--color-accent);
}

.detail-list {
  margin: 1.25rem 0 0;
  padding-left: 1.25rem;
  color: var(--color-slate-700);
  font-size: var(--text-base);
}

.detail-list li + li {
  margin-top: 0.5rem;
}

/* ----- Process list ----- */
.process-list {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 720px) {
  .process-list {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }
}

.process-step {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 1.25rem 1.25rem 1.25rem 1.1rem;
  border: 1px solid rgba(15, 23, 42, 0.06);
  box-shadow: var(--shadow-sm);
}

.process-step-num {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.06em;
  margin-bottom: 0.35rem;
}

.process-step h3 {
  margin: 0 0 0.5rem;
  font-size: var(--text-lg);
  color: var(--color-primary-dark);
}

.process-step p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--color-slate-700);
  line-height: 1.55;
}

/* ----- Contact page ----- */
.contact-lede {
  margin: 0 0 1.5rem;
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-slate-900);
  line-height: 1.45;
  max-width: 40rem;
}

.contact-card {
  padding: 1.25rem 1.5rem;
  background: var(--color-white);
  border-radius: var(--radius);
  border: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: var(--shadow-sm);
}

/* ----- Services grid ----- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr));
  gap: clamp(1.25rem, 3vw, 2rem);
  align-items: stretch;
}

.service-card {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: clamp(1.25rem, 3vw, 2rem);
  border: 1px solid rgba(15, 23, 42, 0.06);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition);
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
}

.service-card-title {
  margin: 0 0 1.25rem;
  font-size: var(--text-xl);
  color: var(--color-primary-dark);
  padding-bottom: 0.75rem;
  border-bottom: 3px solid var(--color-wood);
}

.service-block {
  margin-bottom: 1.5rem;
}

.service-block:last-child {
  margin-bottom: 0;
}

.service-block-title {
  margin: 0 0 0.5rem;
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-primary);
}

.service-block p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--color-slate-700);
}

.service-block--highlight {
  margin-top: 1.25rem;
  padding: 1rem;
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.08), rgba(184, 149, 108, 0.1));
  border-radius: 8px;
  border-left: 4px solid var(--color-accent);
}

/* ----- Case study ----- */
.case-study {
  margin-top: 2rem;
  padding: clamp(1.25rem, 3vw, 2rem);
  background: var(--color-white);
  border-radius: var(--radius);
  border: 1px solid rgba(184, 149, 108, 0.35);
  box-shadow: var(--shadow-sm);
  max-width: 48rem;
}

.case-study-title {
  margin: 0 0 0.75rem;
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-primary-dark);
}

.case-study p {
  margin: 0;
  font-size: var(--text-lg);
  color: var(--color-slate-700);
}

/* ----- Footer ----- */
.site-footer {
  background: var(--color-slate-900);
  color: #cbd5e1;
  padding-block: clamp(2.5rem, 6vw, 4rem);
}

.site-footer a {
  color: #7dd3fc;
}

.site-footer a:hover {
  color: #bae6fd;
}

.footer-cta {
  margin: 0 0 1.5rem;
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-white);
  line-height: 1.4;
  max-width: 40rem;
}

.footer-contact {
  margin-bottom: 1.5rem;
}

.contact-address {
  margin: 0 0 1rem;
  font-size: var(--text-base);
  line-height: 1.6;
  max-width: 32rem;
}

.site-footer .contact-address {
  color: #e2e8f0;
}

.contact-card .contact-address {
  color: var(--color-slate-800);
  margin-bottom: 1.25rem;
}

.footer-contact .contact-line + .contact-line {
  margin-top: 0.35rem;
}

.contact-line {
  margin: 0;
  font-size: var(--text-base);
}

.contact-card .contact-line + .contact-line {
  margin-top: 0.5rem;
}

.copyright {
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-slate-500);
}

/* ----- Scroll reveal ----- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.reveal.reveal--visible {
  opacity: 1;
  transform: translateY(0);
}

/* ----- Responsive: header + mobile drawer ----- */
@media (max-width: 960px) and (min-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    row-gap: 0.65rem;
  }

  .nav-list {
    justify-content: flex-start;
  }
}

@media (max-width: 767px) {
  :root {
    --header-h: 3.65rem;
  }

  body.mob-nav-open {
    overflow: hidden;
  }

  .site-header {
    min-height: var(--header-h);
  }

  .header-inner {
    flex-direction: row;
    flex-wrap: nowrap;
    align-items: center;
    gap: 0.5rem;
    padding-block: 0.5rem;
  }

  .site-header .container {
    padding-inline: max(0.75rem, env(safe-area-inset-left)) max(0.75rem, env(safe-area-inset-right));
  }

  .logo {
    flex: 1;
    min-width: 0;
    font-size: clamp(0.82rem, 3.5vw, 1rem);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .lang-switch {
    flex-shrink: 0;
  }

  .site-header .nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    z-index: 60;
    max-height: min(72vh, calc(100dvh - var(--header-h) - env(safe-area-inset-bottom, 0px)));
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: env(safe-area-inset-bottom, 0);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(30, 90, 138, 0.14);
    box-shadow: 0 16px 40px rgba(15, 23, 42, 0.12);
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition:
      transform 0.28s ease,
      opacity 0.28s ease,
      visibility 0.28s;
  }

  .site-header.nav-menu-open .nav {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-list {
    flex-direction: column;
    flex-wrap: nowrap;
    align-items: stretch;
    gap: 0;
    justify-content: flex-start;
    padding: 0.35rem 0 1rem;
  }

  .nav-list li {
    border-bottom: 1px solid rgba(15, 23, 42, 0.06);
  }

  .nav-list li:last-child {
    border-bottom: none;
  }

  .nav-list a {
    display: block;
    padding: 0.85rem 1rem;
    font-size: 1rem;
    border-bottom: none;
  }

  .nav-list a:hover {
    border-bottom: none;
    background: rgba(14, 165, 233, 0.06);
  }

  .nav-list a[aria-current="page"] {
    border-bottom: none;
    background: rgba(30, 90, 138, 0.08);
  }

  .hero {
    padding-block: clamp(2.5rem, 10vw, 4rem);
  }

  .hero-title {
    font-size: clamp(1.35rem, 5.5vw, 1.65rem);
  }

  .hero-lead {
    margin-bottom: 1.5rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }

  .hero-actions .btn {
    width: 100%;
    text-align: center;
    padding: 0.8rem 1.25rem;
  }

  .btn {
    font-size: 0.95rem;
  }

  .page-title {
    font-size: clamp(1.4rem, 5vw, 1.85rem);
  }

  .prose p {
    font-size: 1.05rem;
  }

  .site-footer .contact-address,
  .site-footer .contact-line,
  .footer-contact .contact-line {
    overflow-wrap: anywhere;
  }

  .lang-catalog-list {
    grid-template-columns: 1fr;
  }

  .lang-quick-table {
    min-width: 0;
    font-size: 0.8rem;
  }

  .lang-quick-table th,
  .lang-quick-table td {
    padding: 0.45rem 0.5rem;
  }
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none !important;
  }
}

/* ----- Scroll Academy — learning path tiers ----- */
.academy-hero {
  background:
    radial-gradient(ellipse 100% 70% at 80% 0%, rgba(14, 165, 233, 0.1), transparent 55%),
    radial-gradient(ellipse 80% 50% at 15% 100%, rgba(184, 149, 108, 0.14), transparent 50%),
    linear-gradient(180deg, #f8fafc 0%, var(--color-surface) 100%);
  border-bottom: 1px solid rgba(15, 23, 42, 0.06);
}

.section-head .section-sub {
  margin: 0.75rem 0 0;
  font-size: var(--text-lg);
  color: var(--color-slate-700);
  max-width: 40rem;
  line-height: 1.55;
}

.learning-path--tiers {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1rem, 2.5vw, 1.75rem);
  align-items: stretch;
  margin-top: 0.5rem;
}

@media (max-width: 1024px) {
  .learning-path--tiers {
    grid-template-columns: 1fr;
    max-width: 26rem;
    margin-inline: auto;
  }
}

.level-tier {
  display: flex;
  flex-direction: column;
  padding: clamp(1.35rem, 3vw, 1.85rem);
  background: var(--color-white);
  border-radius: var(--radius);
  border: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: var(--shadow-md);
  transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.28s ease;
  position: relative;
  overflow: hidden;
}

.level-tier::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  border-radius: 4px 0 0 4px;
}

.level-tier--1::before {
  background: linear-gradient(180deg, var(--color-accent), #0369a1);
}

.level-tier--2::before {
  background: linear-gradient(180deg, var(--color-primary), var(--color-primary-dark));
}

.level-tier--3::before {
  background: linear-gradient(180deg, var(--color-wood), #8b6914);
}

.level-tier:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(30, 90, 138, 0.2);
}

.level-tier__head {
  padding-left: 0.35rem;
}

.level-tier__badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-slate-500);
  margin-bottom: 0.5rem;
}

.level-tier__title {
  margin: 0 0 0.35rem;
  font-size: clamp(1.05rem, 2vw, 1.2rem);
  font-weight: 700;
  color: var(--color-primary-dark);
  line-height: 1.3;
}

.level-tier__tagline {
  margin: 0 0 0.85rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
}

.level-tier__meta {
  margin: 0 0 0.75rem;
  font-size: 0.85rem;
  color: var(--color-slate-500);
  line-height: 1.5;
}

.level-tier__summary {
  margin: 0 0 1.25rem;
  font-size: 0.95rem;
  color: var(--color-slate-700);
  line-height: 1.6;
  flex: 1;
}

.level-tier__summary .level-tier__summary-project {
  display: block;
  margin-top: 0.35rem;
  font-weight: 600;
  color: var(--color-slate-800);
}

.level-tier__cta {
  align-self: flex-start;
  margin-top: auto;
}

.academy-footnote {
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  max-width: 42rem;
  font-size: var(--text-base);
  color: var(--color-slate-700);
  line-height: 1.6;
}

.academy-section-title {
  margin: 2rem 0 1rem;
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary-dark);
  padding-bottom: 0.35rem;
  border-bottom: 2px solid rgba(184, 149, 108, 0.45);
}

.academy-section-title:first-of-type {
  margin-top: 0;
}

.academy-tool-block {
  margin-bottom: 1.25rem;
  padding: 1.1rem 1.25rem;
  background: var(--color-white);
  border-radius: 10px;
  border: 1px solid rgba(15, 23, 42, 0.07);
  box-shadow: var(--shadow-sm);
}

.academy-tool-title {
  margin: 0 0 0.5rem;
  font-size: var(--text-lg);
  color: var(--color-primary);
}

.academy-tool-block p {
  margin: 0;
  font-size: var(--text-base);
  color: var(--color-slate-700);
  line-height: 1.6;
}

.academy-outcome {
  padding: 1.25rem 1.35rem;
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.07), rgba(184, 149, 108, 0.1));
  border-radius: var(--radius);
  border-left: 4px solid var(--color-accent);
}

.academy-outcome p {
  margin: 0;
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-slate-800);
  line-height: 1.55;
}

/* ----- SEO / AEO: utilities & FAQ ----- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container.narrow .section-sub {
  margin-top: 0.5rem;
}

.faq-list {
  margin: 1.5rem 0 0;
  padding: 0;
}

.faq-item {
  margin-bottom: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
}

.faq-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.faq-item dt {
  margin: 0 0 0.5rem;
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-primary-dark);
  line-height: 1.35;
}

.faq-item dd {
  margin: 0;
  font-size: var(--text-base);
  color: var(--color-slate-700);
  line-height: 1.65;
}

.intro-article {
  margin: 0;
}

/* ----- Academy: language catalog (15 tracks) ----- */
.lang-catalog {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.25rem);
  margin-top: 0.5rem;
}

@media (min-width: 900px) {
  .lang-catalog {
    grid-template-columns: repeat(2, 1fr);
  }
}

.lang-catalog__category h3 {
  margin: 0 0 0.85rem;
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-primary-dark);
  padding-bottom: 0.35rem;
  border-bottom: 2px solid var(--color-wood);
}

.lang-catalog-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(12.5rem, 1fr));
  gap: 0.65rem;
}

.lang-catalog-list a {
  display: block;
  padding: 0.65rem 0.85rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  text-decoration: none;
  background: var(--color-white);
  border: 1px solid rgba(15, 23, 42, 0.1);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease, color 0.22s ease;
}

.lang-catalog-list a:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: rgba(30, 90, 138, 0.25);
  color: var(--color-primary);
}

.table-wrap {
  overflow-x: auto;
  margin-top: 0.5rem;
  -webkit-overflow-scrolling: touch;
}

.lang-quick-table {
  width: 100%;
  min-width: 36rem;
  border-collapse: collapse;
  font-size: 0.9rem;
  background: var(--color-white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(15, 23, 42, 0.08);
}

.lang-quick-table caption {
  text-align: left;
}

.lang-quick-table th,
.lang-quick-table td {
  padding: 0.65rem 0.85rem;
  text-align: left;
  border-bottom: 1px solid rgba(15, 23, 42, 0.07);
  vertical-align: top;
}

.lang-quick-table thead th {
  background: var(--color-slate-900);
  color: #e2e8f0;
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.03em;
}

.lang-quick-table tbody tr:hover td {
  background: rgba(14, 165, 233, 0.04);
}

.lang-quick-table tbody tr:last-child td {
  border-bottom: none;
}

.course-lang-meta {
  margin: 0 0 1.25rem;
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-primary);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    transition: none;
    transform: none;
  }

  .reveal.reveal--visible {
    transform: none;
  }

  .site-header .nav {
    transition: none;
  }
}