/* =========================================================
   Addskills Live Courses — Coursera-inspired design system
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Sarabun:wght@400;500;600;700&display=swap');

:root {
  /* Colors */
  --c-primary: #0056d2;
  --c-primary-hover: #00408f;
  --c-primary-soft: #e8f0fe;
  --c-text: #1f1f1f;
  --c-text-body: #2a2a2a;
  --c-muted: #6b6b6b;
  --c-border: #e1e1e1;
  --c-border-strong: #c7c7c7;
  --c-bg: #ffffff;
  --c-bg-soft: #f8f9fa;
  --c-bg-dark: #0a3055;
  --c-success: #0e8a4f;
  --c-warning: #f2bc1c;

  /* Typography */
  --font-en: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-th: 'Sarabun', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-stack: 'Sarabun', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Spacing */
  --container-max: 1200px;
  --container-pad: 24px;

  /* Effects */
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  --transition: 0.2s ease;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-stack);
  font-size: 16px;
  line-height: 1.6;
  color: var(--c-text-body);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
a { color: var(--c-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { color: var(--c-text); line-height: 1.25; margin: 0 0 0.5em; font-weight: 700; }
h1 { font-size: clamp(28px, 4vw, 44px); font-weight: 800; letter-spacing: -0.02em; }
h2 { font-size: clamp(24px, 3vw, 32px); letter-spacing: -0.01em; }
h3 { font-size: 20px; }
p { margin: 0 0 1em; }
ul { padding-left: 1.25em; }

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

/* =========================================================
   Header
   ========================================================= */
.site-header {
  background: #fff;
  border-bottom: 1px solid var(--c-border);
  position: sticky;
  top: 0;
  z-index: 50;
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 20px;
  color: var(--c-text);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none; }
.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--c-primary);
  color: #fff;
  font-weight: 800;
  font-family: var(--font-en);
}
.nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav a {
  color: var(--c-text-body);
  font-weight: 500;
  font-size: 15px;
}
.nav a:hover { color: var(--c-primary); text-decoration: none; }

@media (max-width: 720px) {
  .nav { display: none; }
}

/* =========================================================
   Buttons
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  transition: var(--transition);
  border: 1.5px solid transparent;
  white-space: nowrap;
}
.btn--primary {
  background: var(--c-primary);
  color: #fff;
}
.btn--primary:hover {
  background: var(--c-primary-hover);
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}
.btn--ghost {
  background: transparent;
  color: var(--c-primary);
  border-color: var(--c-primary);
}
.btn--ghost:hover {
  background: var(--c-primary-soft);
  text-decoration: none;
}
.btn--lg { padding: 14px 28px; font-size: 16px; }
.btn--block { width: 100%; }
button.btn {
  font-family: inherit;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
}

/* =========================================================
   Hero
   ========================================================= */
.hero {
  background: linear-gradient(180deg, #f4f8ff 0%, #ffffff 100%);
  border-bottom: 1px solid var(--c-border);
  padding: 48px 0 64px;
}
.hero__grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 48px;
  align-items: start;
}
.hero__breadcrumb {
  font-size: 13px;
  color: var(--c-muted);
  margin-bottom: 16px;
}
.hero__breadcrumb a { color: var(--c-muted); }
.hero__breadcrumb a:hover { color: var(--c-primary); }
.hero__pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--c-primary);
  margin-bottom: 20px;
}
.hero__title { margin-bottom: 16px; }
.hero__lede {
  font-size: 18px;
  color: var(--c-text-body);
  margin-bottom: 24px;
  max-width: 60ch;
}
.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 32px;
  margin-bottom: 24px;
  font-size: 14px;
  color: var(--c-muted);
}
.hero__meta strong { color: var(--c-text); font-weight: 600; }
.hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}
.chip {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--c-text-body);
}

/* Schedule callout in hero */
.hero__schedule {
  display: inline-block;
  margin-bottom: 16px;
  padding: 10px 16px;
  background: #fff;
  border: 1px solid var(--c-border);
  border-left: 3px solid var(--c-primary);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--c-text-body);
}
.hero__schedule strong { color: var(--c-text); font-weight: 700; }

/* Date block at top of enrollment card */
.enroll-card__date {
  background: var(--c-primary-soft);
  color: var(--c-primary);
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  text-align: center;
  margin-bottom: 18px;
  font-size: 13px;
  line-height: 1.5;
  font-weight: 500;
}
.enroll-card__date strong {
  display: block;
  color: var(--c-text);
  font-size: 16px;
  margin: 2px 0;
}

/* Money-back guarantee strip in enrollment card */
.enroll-card__guarantee {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: rgba(14, 138, 79, 0.08);
  color: var(--c-success);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 13px;
  font-weight: 600;
  margin: 14px 0 0;
}
.enroll-card__guarantee::before {
  content: '';
  width: 16px;
  height: 16px;
  flex: none;
  background: var(--c-success);
  -webkit-mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path fill='black' d='M12 1 3 5v6c0 5.5 3.8 10.7 9 12 5.2-1.3 9-6.5 9-12V5z'/></svg>") no-repeat center / contain;
          mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path fill='black' d='M12 1 3 5v6c0 5.5 3.8 10.7 9 12 5.2-1.3 9-6.5 9-12V5z'/></svg>") no-repeat center / contain;
}

/* Anonymity / trust note in instructor block */
.instructor__note {
  margin-top: 16px;
  padding: 14px 16px;
  background: var(--c-bg-soft);
  border-left: 3px solid var(--c-primary);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--c-muted);
  line-height: 1.6;
}
.instructor__note strong { color: var(--c-text); }

/* Catalog card schedule strip */
.course-card__schedule {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--c-text-body);
  background: var(--c-bg-soft);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
}
.course-card__schedule strong { color: var(--c-text); }
.course-card__price {
  color: var(--c-primary);
  font-weight: 700;
  font-size: 15px;
  white-space: nowrap;
}

/* Enrollment card */
.enroll-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 28px;
  position: sticky;
  top: 88px;
}
.enroll-card__price {
  font-size: 32px;
  font-weight: 800;
  color: var(--c-text);
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}
.enroll-card__price-note {
  font-size: 13px;
  color: var(--c-muted);
  margin-bottom: 20px;
}
.enroll-card__list {
  list-style: none;
  padding: 0;
  margin: 20px 0 0;
  font-size: 14px;
}
.enroll-card__list li {
  position: relative;
  padding: 8px 0 8px 28px;
  color: var(--c-text-body);
  line-height: 1.5;
}
.enroll-card__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 11px;
  width: 18px;
  height: 18px;
  background: var(--c-success);
  -webkit-mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path fill='black' d='M9 16.2 4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z'/></svg>") no-repeat center / contain;
          mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path fill='black' d='M9 16.2 4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z'/></svg>") no-repeat center / contain;
}

@media (max-width: 960px) {
  .hero__grid { grid-template-columns: 1fr; }
  .enroll-card { position: static; }
}

/* =========================================================
   Section
   ========================================================= */
.section {
  padding: 64px 0;
  border-bottom: 1px solid var(--c-border);
}
.section--soft { background: var(--c-bg-soft); }
.section__title { margin-bottom: 8px; }
.section__intro {
  color: var(--c-muted);
  font-size: 17px;
  margin-bottom: 32px;
  max-width: 65ch;
}

/* Learn list */
.learn-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  padding: 0;
  margin: 0;
  max-width: 70ch;
}
.learn-grid li {
  position: relative;
  padding-left: 34px;
  list-style: none;
  font-size: 16px;
  line-height: 1.6;
}
.learn-grid li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 5px;
  width: 22px;
  height: 22px;
  background: var(--c-primary);
  -webkit-mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path fill='black' d='M9 16.2 4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z'/></svg>") no-repeat center / contain;
          mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path fill='black' d='M9 16.2 4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z'/></svg>") no-repeat center / contain;
}

/* Skill chips strong */
.skill-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 0;
  list-style: none;
  margin: 0;
}
.skill-chips li {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--c-text-body);
}

/* Multi-environment explainer */
.env-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 40px;
}
.env-comparison__col {
  padding: 22px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--c-border);
  background: #fff;
}
.env-comparison__col--bad {
  border-color: #f5c2c7;
  background: #fff5f5;
}
.env-comparison__col--good {
  border-color: #b6d8ad;
  background: #f0f9eb;
}
.env-comparison__label {
  font-size: 13px;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 12px;
}
.env-comparison__flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  font-size: 16px;
  margin-bottom: 10px;
  font-family: var(--font-en);
  font-weight: 500;
}
.env-comparison__flow code {
  background: rgba(0,0,0,0.06);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 14px;
}
.env-comparison__flow strong {
  color: var(--c-text);
  font-weight: 700;
}
.env-comparison__arrow {
  color: var(--c-muted);
  font-weight: 400;
}
.env-comparison__caption {
  font-size: 14px;
  color: var(--c-text-body);
  margin: 0;
  line-height: 1.55;
}

.env-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 24px;
}
.env-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 22px 20px 20px;
  position: relative;
}
.env-card__num {
  position: absolute;
  top: -12px;
  left: 18px;
  background: var(--c-primary);
  color: #fff;
  font-weight: 700;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-family: var(--font-en);
}
.env-card__name {
  font-family: var(--font-en);
  font-size: 18px;
  margin: 4px 0 4px;
  color: var(--c-text);
  font-weight: 700;
}
.env-card__purpose {
  font-size: 13px;
  color: var(--c-primary);
  font-weight: 600;
  margin: 0 0 10px;
}
.env-card__detail {
  font-size: 14px;
  color: var(--c-text-body);
  margin: 0;
  line-height: 1.6;
}
.env-callout {
  text-align: center;
  margin-top: 32px;
  padding: 16px 24px;
  background: var(--c-primary-soft);
  border-radius: var(--radius);
  color: var(--c-text);
  font-size: 15px;
  line-height: 1.6;
}

@media (max-width: 900px) {
  .env-grid { grid-template-columns: repeat(2, 1fr); }
  .env-comparison { grid-template-columns: 1fr; }
}
@media (max-width: 540px) {
  .env-grid { grid-template-columns: 1fr; }
}

/* Screenshots gallery */
.screenshots {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}
.screenshot {
  margin: 0;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.screenshot:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}
.screenshot img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background: linear-gradient(135deg, #f4f8ff 0%, #e8f0fe 100%);
  color: var(--c-muted);
  font-size: 13px;
  text-align: center;
  padding: 0;
}
.screenshot figcaption {
  padding: 14px 18px;
  font-size: 14px;
  color: var(--c-muted);
  border-top: 1px solid var(--c-border);
  line-height: 1.5;
}
.screenshot figcaption strong { color: var(--c-text); }
.screenshot img { cursor: zoom-in; }

/* Lightbox (native <dialog>) */
.lightbox {
  border: none;
  background: transparent;
  padding: 0;
  margin: 0;
  width: 100vw;
  max-width: 100vw;
  height: 100vh;
  max-height: 100vh;
  overflow: hidden;
}
.lightbox::backdrop {
  background: rgba(0, 0, 0, 0.92);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.lightbox img {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  max-width: 92vw;
  max-height: 84vh;
  border-radius: 6px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  cursor: default;
}
.lightbox__caption {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.92);
  font-size: 14px;
  text-align: center;
  max-width: min(90vw, 720px);
  margin: 0;
  padding: 10px 18px;
  background: rgba(0, 0, 0, 0.55);
  border-radius: 8px;
  pointer-events: none;
  line-height: 1.5;
}
.lightbox__caption strong { color: #fff; }
.lightbox__caption code {
  background: rgba(255, 255, 255, 0.12);
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 0.92em;
}
.lightbox__close {
  position: absolute;
  top: 18px;
  right: 22px;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  border: none;
  font-size: 22px;
  font-weight: 300;
  cursor: pointer;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}
.lightbox__close:hover { background: rgba(255, 255, 255, 0.28); }

/* Syllabus */
.modules { display: flex; flex-direction: column; gap: 16px; }
.module {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 24px;
  display: grid;
  grid-template-columns: 56px 1fr auto;
  gap: 20px;
  align-items: start;
}
.module__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--c-primary-soft);
  color: var(--c-primary);
  font-weight: 700;
  font-size: 18px;
  font-family: var(--font-en);
}
.module__title { margin-bottom: 6px; font-size: 18px; }
.module__desc { color: var(--c-muted); font-size: 15px; margin: 0; }
.module__time {
  font-size: 13px;
  color: var(--c-muted);
  white-space: nowrap;
  font-weight: 500;
}

@media (max-width: 540px) {
  .module { grid-template-columns: 44px 1fr; }
  .module__time { grid-column: 2; }
}

/* Audience cards */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.audience-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 24px;
}
.audience-card h3 { font-size: 17px; }
.audience-card p { color: var(--c-muted); margin: 0; font-size: 15px; }

@media (max-width: 860px) {
  .audience-grid { grid-template-columns: 1fr; }
}

/* Instructor */
.instructor {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 28px;
  align-items: start;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.instructor__avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--c-primary), #1f7ae0);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-en);
  font-size: 44px;
  font-weight: 700;
}
.instructor__name { margin-bottom: 4px; }
.instructor__role { color: var(--c-muted); font-size: 15px; margin-bottom: 12px; }
.instructor__bio { font-size: 15px; color: var(--c-text-body); margin: 0; }

@media (max-width: 640px) {
  .instructor { grid-template-columns: 1fr; text-align: center; }
  .instructor__avatar { margin: 0 auto; }
}

/* FAQ */
.faq { display: flex; flex-direction: column; gap: 12px; }
.faq__item {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
}
.faq__q {
  width: 100%;
  text-align: left;
  padding: 18px 56px 18px 22px;
  font-size: 16px;
  font-weight: 600;
  color: var(--c-text);
  position: relative;
  cursor: pointer;
  line-height: 1.5;
}
.faq__q::after {
  content: '+';
  position: absolute;
  right: 22px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 24px;
  font-weight: 400;
  color: var(--c-muted);
  transition: var(--transition);
  font-family: var(--font-en);
}
.faq__item[open] .faq__q::after { transform: translateY(-50%) rotate(45deg); }
.faq__a {
  padding: 0 22px 20px;
  color: var(--c-text-body);
  font-size: 15px;
  margin: 0;
}

/* CTA banner */
.cta-banner {
  background: linear-gradient(135deg, var(--c-primary) 0%, #1f4ba0 100%);
  color: #fff;
  padding: 56px 0;
  text-align: center;
}
.cta-banner h2 { color: #fff; margin-bottom: 12px; }
.cta-banner p { color: rgba(255, 255, 255, 0.9); margin-bottom: 28px; font-size: 17px; }
.cta-banner .btn--primary {
  background: #fff;
  color: var(--c-primary);
}
.cta-banner .btn--primary:hover { background: #f0f0f0; }

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  background: var(--c-bg-dark);
  color: rgba(255, 255, 255, 0.78);
  padding: 48px 0 32px;
  font-size: 14px;
}
.site-footer a { color: rgba(255, 255, 255, 0.78); }
.site-footer a:hover { color: #fff; }
.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 32px;
}
.footer__col h4 { color: #fff; font-size: 15px; margin-bottom: 16px; }
.footer__col ul { list-style: none; padding: 0; margin: 0; }
.footer__col li { margin-bottom: 8px; }
.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.55);
}

@media (max-width: 760px) {
  .footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .footer__grid { grid-template-columns: 1fr; }
}

/* =========================================================
   Catalog (livecourse/index.html)
   ========================================================= */
.catalog-hero {
  padding: 72px 0 56px;
  background: linear-gradient(180deg, #f4f8ff 0%, #ffffff 100%);
  text-align: center;
}
.catalog-hero h1 { margin-bottom: 16px; }
.catalog-hero p {
  font-size: 18px;
  color: var(--c-muted);
  max-width: 60ch;
  margin: 0 auto;
}
.catalog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
  padding: 56px 0 80px;
}
.course-card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  text-decoration: none;
  color: inherit;
}
.course-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  text-decoration: none;
  border-color: var(--c-primary);
}
.course-card__cover {
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-en);
  font-weight: 800;
  font-size: 36px;
  color: #fff;
  letter-spacing: 0.04em;
}
.course-card__cover--cicd { background: linear-gradient(135deg, #fc6d26 0%, #e24329 100%); }
.course-card__cover--gh { background: linear-gradient(135deg, #2d333b 0%, #0d1117 100%); }
.course-card__cover--tf { background: linear-gradient(135deg, #7b42bc 0%, #5c2d91 100%); }
.course-card__body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.course-card__tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--c-primary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}
.course-card__title { font-size: 20px; margin-bottom: 8px; }
.course-card__desc { color: var(--c-muted); font-size: 14px; flex: 1; margin-bottom: 16px; }
.course-card__meta {
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--c-muted);
  border-top: 1px solid var(--c-border);
  padding-top: 14px;
}

@media (max-width: 760px) {
  .catalog-grid { grid-template-columns: 1fr; }
}