:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-muted: #eef4f2;
  --text: #17202a;
  --muted: #5d6978;
  --line: #d9e0e7;
  --ink: #0f172a;
  --accent: #0f766e;
  --accent-strong: #b45309;
  --focus: #2563eb;
  --danger: #b91c1c;
  --radius: 8px;
  --shadow: 0 14px 32px rgb(15 23 42 / 12%);
  font-family: Inter, "Hiragino Sans", "Yu Gothic", "Yu Gothic UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

a {
  color: inherit;
}

button,
input {
  font: inherit;
}

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 64px;
  padding: 12px clamp(18px, 4vw, 56px);
  border-bottom: 1px solid rgb(255 255 255 / 24%);
  background: rgb(15 23 42 / 86%);
  color: #fff;
  backdrop-filter: blur(14px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}

.brand-mark {
  display: inline-grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border: 1px solid rgb(255 255 255 / 30%);
  border-radius: 50%;
  background: #fff;
  color: #0f172a;
  font-size: 14px;
  letter-spacing: 0;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.nav-links a {
  min-height: 36px;
  padding: 8px 10px;
  border-radius: 999px;
  color: rgb(255 255 255 / 88%);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  background: rgb(255 255 255 / 14%);
  color: #fff;
  outline: none;
}

.hero {
  position: relative;
  display: grid;
  min-height: min(78vh, 680px);
  overflow: hidden;
  background: #111827;
  color: #fff;
}

.hero-media {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  opacity: 0.64;
}

.hero-media img {
  width: 100%;
  height: 100%;
  min-height: 0;
  object-fit: cover;
  filter: saturate(0.86) contrast(1.03);
}

.hero::after {
  position: absolute;
  inset: 0;
  content: "";
  background:
    linear-gradient(90deg, rgb(10 15 25 / 94%) 0%, rgb(10 15 25 / 74%) 42%, rgb(10 15 25 / 18%) 100%),
    linear-gradient(0deg, rgb(10 15 25 / 76%) 0%, rgb(10 15 25 / 0%) 38%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(1120px, calc(100% - 36px));
  margin: auto;
  padding: 78px 0 58px;
}

.eyebrow {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  margin: 0 0 18px;
  color: #9de8dd;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0;
}

h1 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(44px, 8vw, 92px);
  line-height: 0.98;
  letter-spacing: 0;
}

.hero-lead {
  max-width: 670px;
  margin: 22px 0 0;
  color: rgb(255 255 255 / 88%);
  font-size: clamp(17px, 2.1vw, 22px);
}

.hero-actions,
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}

.button.primary {
  border-color: #0f766e;
  background: #0f766e;
  color: #fff;
}

.button.dark {
  border-color: #0f172a;
  background: #0f172a;
  color: #fff;
}

.button.ghost {
  border-color: rgb(255 255 255 / 38%);
  background: rgb(255 255 255 / 10%);
  color: #fff;
}

.button:hover,
.button:focus-visible,
.material-link:hover,
.material-link:focus-visible {
  transform: translateY(-1px);
  outline: 2px solid transparent;
  box-shadow: 0 10px 22px rgb(15 23 42 / 16%);
}

.section {
  padding: 56px clamp(18px, 4vw, 56px);
}

.section.alt {
  background: #ffffff;
}

.section-inner {
  width: min(1180px, 100%);
  margin: 0 auto;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 22px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1.14;
  letter-spacing: 0;
}

.section-heading p {
  max-width: 560px;
  margin: 8px 0 0;
  color: var(--muted);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.stat {
  min-height: 112px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.stat strong {
  display: block;
  color: var(--ink);
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1;
}

.stat span {
  display: block;
  margin-top: 10px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.catalog-tools {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto;
  gap: 16px;
  align-items: end;
  margin-bottom: 18px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.search-field {
  display: grid;
  gap: 7px;
}

.search-field label,
.filter-group-label {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.search-field input {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius);
  background: #fff;
  color: var(--text);
}

.search-field input:focus {
  border-color: var(--focus);
  outline: 3px solid rgb(37 99 235 / 18%);
}

.filter-panel {
  display: grid;
  gap: 10px;
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.filter-button {
  min-width: 70px;
  min-height: 38px;
  border: 1px solid #cbd5e1;
  border-radius: 999px;
  background: #fff;
  color: var(--text);
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
}

.filter-button[aria-pressed="true"] {
  border-color: #0f766e;
  background: #0f766e;
  color: #fff;
}

.result-line {
  min-height: 26px;
  margin: 0 0 14px;
  color: var(--muted);
  font-weight: 700;
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.course-card {
  --course-color: #334155;
  display: grid;
  overflow: hidden;
  border: 1px solid var(--line);
  border-top: 5px solid var(--course-color);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 8px 22px rgb(15 23 42 / 7%);
}

.course-shot {
  aspect-ratio: 16 / 9;
  background: #e2e8f0;
}

.course-shot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.course-body {
  display: grid;
  gap: 14px;
  padding: 18px;
}

.course-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 4px 9px;
  border-radius: 999px;
  background: #edf2f7;
  color: #334155;
  font-size: 12px;
  font-weight: 900;
}

.pill.colored {
  background: color-mix(in srgb, var(--course-color) 16%, white);
  color: var(--course-color);
}

.course-body h3 {
  margin: 0;
  color: var(--ink);
  font-size: 21px;
  line-height: 1.25;
  letter-spacing: 0;
}

.course-body p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.lesson-list {
  display: grid;
  gap: 10px;
}

.lesson-row {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  padding-top: 10px;
  border-top: 1px solid #e5e7eb;
}

.lesson-number {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border-radius: 50%;
  background: var(--course-color);
  color: #fff;
  font-size: 13px;
  font-weight: 900;
}

.lesson-content strong {
  display: block;
  color: var(--ink);
  line-height: 1.35;
}

.lesson-content span {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 13px;
}

.material-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 9px;
}

.material-link {
  display: inline-flex;
  min-height: 32px;
  align-items: center;
  justify-content: center;
  padding: 5px 9px;
  border: 1px solid #d1d9e2;
  border-radius: 6px;
  background: #fff;
  color: #1f2937;
  font-size: 12px;
  font-weight: 900;
  text-decoration: none;
}

.material-link.disabled {
  color: #8a94a6;
  pointer-events: none;
}

.course-actions,
.download-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.download-row {
  margin-top: 10px;
}

.download-link {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  justify-content: center;
  padding: 7px 11px;
  border: 1px solid #0f766e;
  border-radius: 6px;
  background: #fff;
  color: #0f766e;
  font-size: 13px;
  font-weight: 900;
  text-decoration: none;
}

.download-link.primary {
  min-height: 40px;
  padding-inline: 13px;
  background: #0f766e;
  color: #fff;
}

.download-link.disabled {
  border-color: #cbd5e1;
  color: #8a94a6;
  pointer-events: none;
}

.download-link:hover,
.download-link:focus-visible {
  transform: translateY(-1px);
  outline: 2px solid transparent;
  box-shadow: 0 10px 22px rgb(15 23 42 / 16%);
}

.optional-list,
.audience-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.audience-item,
.optional-item {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.audience-item h3,
.optional-item h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.audience-item p,
.optional-item p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.optional-item a {
  display: inline-flex;
  margin-top: 12px;
  color: #0f766e;
  font-weight: 900;
  text-decoration: none;
}

.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(260px, 0.7fr);
  gap: 18px;
  align-items: start;
}

.contact-form,
.contact-aside {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.contact-form {
  display: grid;
  gap: 18px;
  padding: 22px;
}

.contact-form .button {
  justify-self: start;
}

.form-field {
  display: grid;
  gap: 7px;
}

.form-field label,
.consent-field {
  color: var(--ink);
  font-size: 14px;
  font-weight: 800;
}

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius);
  background: #fff;
  color: var(--text);
  font: inherit;
}

.form-field textarea {
  min-height: 180px;
  resize: vertical;
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  border-color: var(--focus);
  outline: 3px solid rgb(37 99 235 / 18%);
}

.field-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 12px;
}

.consent-field {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  cursor: pointer;
}

.consent-field input {
  width: 18px;
  height: 18px;
  margin: 2px 0 0;
}

.form-status {
  min-height: 24px;
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
}

.form-status.error {
  color: var(--danger);
}

.form-status.success {
  color: #047857;
}

.contact-aside {
  padding: 22px;
}

.contact-aside h3 {
  margin: 0 0 12px;
  font-size: 20px;
}

.contact-aside ol {
  margin: 0;
  padding-left: 22px;
}

.contact-aside li + li {
  margin-top: 8px;
}

.contact-aside p {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.contact-aside a {
  display: inline-flex;
  margin-top: 18px;
  color: #0f766e;
  font-weight: 900;
  text-decoration: none;
}

.site-footer {
  padding: 28px clamp(18px, 4vw, 56px);
  background: #0f172a;
  color: rgb(255 255 255 / 76%);
}

.footer-inner {
  display: flex;
  width: min(1180px, 100%);
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.footer-inner a {
  color: #fff;
  font-weight: 800;
}

.empty-state {
  padding: 28px;
  border: 1px dashed #aab4c3;
  border-radius: var(--radius);
  background: #fff;
  color: var(--muted);
}

@media (max-width: 980px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

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

  .hero-media {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-grid,
  .course-grid,
  .optional-list,
  .audience-grid,
  .contact-layout {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .catalog-tools,
  .section-heading {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .filter-group {
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .site-header {
    position: static;
  }

  .nav-links a {
    min-height: 34px;
    padding-inline: 8px;
    font-size: 13px;
  }

  .hero {
    min-height: 660px;
  }

  .hero-media {
    opacity: 0.48;
  }

  .hero::after {
    background: rgb(10 15 25 / 82%);
  }

  .hero-content {
    padding-top: 48px;
  }

  .stats-grid,
  .course-grid,
  .optional-list,
  .audience-grid,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .field-meta {
    align-items: flex-start;
    flex-direction: column;
  }

  .catalog-tools {
    padding: 12px;
  }

  .filter-button {
    min-width: 64px;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}