/* ==============================================
   ThaiUpSkill — main.css (รองรับ Video + Ebook)
   ============================================== */

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --font-thai:   'Sarabun', 'Noto Sans Thai', sans-serif;
  --amber:       #BA7517;
  --amber-light: #FAEEDA;
  --amber-mid:   #EF9F27;
  --amber-dark:  #633806;
  --teal:        #0F6E56;
  --teal-light:  #E1F5EE;
  --teal-mid:    #1D9E75;
  --teal-dark:   #04342C;
  --blue:        #185FA5;
  --blue-light:  #E6F1FB;
  --blue-mid:    #378ADD;
  --gray-50:     #F1EFE8;
  --gray-200:    #B4B2A9;
  --gray-600:    #5F5E5A;
  --gray-900:    #2C2C2A;
  --bg:          #FFFFFF;
  --bg-alt:      #F9F8F5;
  --text:        #1A1918;
  --text-muted:  #5F5E5A;
  --border:      rgba(44,44,42,0.12);
  --border-hover:rgba(44,44,42,0.25);
  --radius:      12px;
  --radius-sm:   8px;
  --radius-pill: 20px;
  --shadow-sm:   0 1px 3px rgba(0,0,0,0.06);
  --shadow-md:   0 4px 12px rgba(0,0,0,0.08);
  --max-w:       1140px;
  --transition:  0.15s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-thai);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; }

.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
}

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 22px; border-radius: var(--radius-sm);
  font-family: var(--font-thai); font-size: 14px; font-weight: 500;
  border: 1px solid transparent; transition: all var(--transition);
  white-space: nowrap;
}
.btn--sm { padding: 7px 16px; font-size: 13px; }

.btn--primary {
  background: var(--amber-mid); color: #fff; border-color: var(--amber-mid);
}
.btn--primary:hover { background: var(--amber); border-color: var(--amber); }

.btn--outline {
  background: transparent; color: var(--text); border-color: var(--border-hover);
}
.btn--outline:hover { background: var(--bg-alt); }

.btn--ghost {
  background: transparent; color: var(--text); border-color: var(--border);
}
.btn--ghost:hover { background: var(--gray-50); }

.btn--teal {
  background: var(--teal-mid); color: #fff; border-color: var(--teal-mid);
}
.btn--teal:hover { background: var(--teal); }

/* ── Navbar ── */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.navbar__inner {
  display: flex; align-items: center; gap: 24px;
  height: 60px;
}
.navbar__logo {
  font-size: 18px; font-weight: 600; letter-spacing: -0.3px;
  color: var(--gray-900); flex-shrink: 0;
}
.logo-accent { color: var(--amber); }

.navbar__links {
  display: flex; align-items: center; gap: 4px; flex: 1;
}
.nav-link {
  display: flex; align-items: center; gap: 5px;
  padding: 6px 12px; border-radius: var(--radius-sm);
  font-size: 14px; color: var(--text-muted);
  transition: all var(--transition);
}
.nav-link:hover { color: var(--text); background: var(--gray-50); }
.nav-link--new { color: var(--teal); }
.nav-link--new:hover { background: var(--teal-light); }

.badge-new {
  background: var(--teal-light); color: var(--teal);
  font-size: 10px; padding: 1px 6px; border-radius: 4px; font-weight: 600;
}

.navbar__actions {
  display: flex; align-items: center; gap: 8px; margin-left: auto;
}

.hamburger {
  display: none; background: none; border: none;
  font-size: 22px; color: var(--text); padding: 4px;
}

/* ── Hero ── */
.hero {
  padding: 64px 0 48px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.hero__inner {
  display: grid; grid-template-columns: 1fr 320px; gap: 48px; align-items: center;
}
.hero__badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--teal-light); color: var(--teal);
  font-size: 12px; font-weight: 500;
  padding: 5px 12px; border-radius: var(--radius-pill);
  margin-bottom: 20px;
}
.hero__title {
  font-size: 36px; font-weight: 600; line-height: 1.25;
  color: var(--gray-900); margin-bottom: 16px;
}
.hero__title em { font-style: normal; color: var(--amber); }
.hero__desc { font-size: 15px; color: var(--text-muted); margin-bottom: 28px; line-height: 1.75; }

.hero__cta { display: flex; gap: 10px; flex-wrap: wrap; }

.hero__stats {
  display: flex; gap: 28px; margin-top: 36px;
  padding-top: 28px; border-top: 1px solid var(--border);
  flex-wrap: wrap;
}
.stat__num { display: block; font-size: 22px; font-weight: 600; color: var(--gray-900); }
.stat__label { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

/* Hero Visual Cards */
.hero__visual {
  display: flex; flex-direction: column; gap: 12px;
}
.hero-card {
  display: flex; align-items: center; gap: 14px;
  padding: 16px 20px; border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition);
}
.hero-card:hover { transform: translateX(4px); }
.hero-card__icon {
  width: 44px; height: 44px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; flex-shrink: 0;
}
.hero-card--video .hero-card__icon { background: var(--blue-light); color: var(--blue); }
.hero-card--ebook .hero-card__icon { background: var(--teal-light); color: var(--teal); }
.hero-card--cert  .hero-card__icon { background: var(--amber-light); color: var(--amber); }
.hero-card__info strong { display: block; font-size: 14px; font-weight: 500; }
.hero-card__info span  { font-size: 12px; color: var(--text-muted); }

/* ── Promo Banner ── */
.promo-banner { padding: 24px 0; background: var(--bg-alt); }
.promo-banner__card {
  display: flex; align-items: center; gap: 20px;
  padding: 20px 28px; border-radius: var(--radius);
  background: var(--teal-light);
  border: 1px solid rgba(29,158,117,0.3);
  flex-wrap: wrap;
}
.promo-banner__icon {
  width: 52px; height: 52px; border-radius: 12px;
  background: var(--teal-mid); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; flex-shrink: 0;
}
.promo-banner__text { flex: 1; min-width: 200px; }
.promo-banner__text h2 { font-size: 15px; font-weight: 600; color: var(--teal-dark); margin-bottom: 4px; }
.promo-banner__text p  { font-size: 13px; color: var(--teal); line-height: 1.5; }
.promo-banner .btn--teal { margin-left: auto; }

/* ── Sections ── */
.section { padding: 56px 0; }
.section--alt { background: var(--bg-alt); }

.section__header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px;
}
.section__title {
  font-size: 20px; font-weight: 600; color: var(--gray-900);
  display: flex; align-items: center; gap: 8px;
}
.section__link { font-size: 13px; color: var(--text-muted); display: flex; align-items: center; gap: 4px; }
.section__link:hover { color: var(--amber); }

/* ── Type Tabs ── */
.type-tabs {
  display: flex; gap: 6px; flex-wrap: wrap;
  margin-bottom: 16px;
}
.type-tab {
  display: flex; align-items: center; gap: 6px;
  padding: 7px 16px; border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  font-size: 13px; color: var(--text-muted);
  background: var(--bg);
  transition: all var(--transition);
}
.type-tab:hover { border-color: var(--border-hover); color: var(--text); }
.type-tab--active[data-tab="all"]   { background: var(--gray-900); color: #fff; border-color: var(--gray-900); }
.type-tab--active[data-tab="video"] { background: var(--blue-light); color: var(--blue); border-color: var(--blue); }
.type-tab--active[data-tab="ebook"] { background: var(--teal-light); color: var(--teal); border-color: var(--teal); }

/* ── Subject Filter ── */
.subject-filter {
  display: flex; gap: 6px; flex-wrap: wrap;
  margin-bottom: 24px;
}
.subj-chip {
  padding: 5px 12px; border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  font-size: 12px; color: var(--text-muted);
  background: var(--bg);
  transition: all var(--transition);
}
.subj-chip:hover { border-color: var(--border-hover); color: var(--text); }
.subj-chip--active { background: var(--amber-light); color: var(--amber-dark); border-color: var(--amber); }

/* ── Courses Grid ── */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}
.course-card {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  transition: all var(--transition);
  display: flex; flex-direction: column;
}
.course-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.course-card__thumb {
  height: 110px; display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
}
.thumb--math   { background: #E6F1FB; }
.thumb--sci    { background: #E1F5EE; }
.thumb--eng    { background: #FBEAF0; }
.thumb--thai   { background: #FAEEDA; }
.thumb--social { background: #EEEDFE; }

.thumb-emoji { font-size: 40px; }

.type-badge {
  position: absolute; top: 8px; right: 8px;
  display: flex; align-items: center; gap: 4px;
  font-size: 10px; font-weight: 500;
  padding: 3px 8px; border-radius: 5px;
}
.badge--video { background: var(--blue-light); color: var(--blue); }
.badge--ebook { background: var(--teal-light); color: var(--teal); }

.course-card__body { padding: 14px; flex: 1; display: flex; flex-direction: column; }
.course-card__title {
  font-size: 14px; font-weight: 500; color: var(--gray-900);
  line-height: 1.45; margin-bottom: 5px;
}
.course-card__teacher { font-size: 12px; color: var(--text-muted); flex: 1; }
.course-card__meta {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 12px; padding-top: 10px; border-top: 1px solid var(--border);
}
.level-chip {
  font-size: 11px; background: var(--gray-50); color: var(--gray-600);
  padding: 2px 8px; border-radius: 4px;
}
.price { font-size: 14px; font-weight: 600; color: var(--gray-900); }
.price--free { color: var(--teal); }

/* ── Ebook Row List ── */
.ebook-list { display: flex; flex-direction: column; gap: 10px; }
.ebook-row {
  display: flex; align-items: center; gap: 16px;
  padding: 14px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition);
}
.ebook-row:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-sm);
}
.ebook-row__cover {
  width: 44px; height: 56px;
  border-radius: 5px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; flex-shrink: 0;
}
.ebook-row__info { flex: 1; min-width: 0; }
.ebook-row__title {
  font-size: 14px; font-weight: 500; color: var(--gray-900);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  margin-bottom: 3px;
}
.ebook-row__author { font-size: 12px; color: var(--text-muted); }
.ebook-row__right {
  display: flex; flex-direction: column; align-items: flex-end; gap: 4px;
  flex-shrink: 0;
}
.ebook-row__pages { font-size: 11px; color: var(--text-muted); }

/* ── About ── */
.about-grid {
  display: grid; grid-template-columns: 340px 1fr; gap: 56px; align-items: center;
}
.about-visual {
  display: flex; flex-direction: column; gap: 10px;
}
.about-visual__block {
  display: flex; align-items: center; gap: 14px;
  padding: 16px 20px; border-radius: var(--radius);
  border: 1px solid var(--border);
  font-size: 13px; color: var(--text-muted);
}
.about-visual__block i { font-size: 24px; flex-shrink: 0; }
.about-visual__block--video { border-left: 3px solid var(--blue); }
.about-visual__block--video i { color: var(--blue); }
.about-visual__block--ebook { border-left: 3px solid var(--teal); }
.about-visual__block--ebook i { color: var(--teal); }
.about-visual__block--support { border-left: 3px solid var(--amber); }
.about-visual__block--support i { color: var(--amber); }

.about-content p { font-size: 15px; color: var(--text-muted); line-height: 1.8; }
.about-features { margin-top: 24px; display: flex; flex-direction: column; gap: 14px; }
.about-feature {
  display: flex; align-items: flex-start; gap: 12px;
}
.about-feature i {
  font-size: 20px; color: var(--amber);
  margin-top: 2px; flex-shrink: 0;
}
.about-feature strong { display: block; font-size: 14px; font-weight: 500; color: var(--gray-900); }
.about-feature span  { font-size: 13px; color: var(--text-muted); }

/* ── Empty State ── */
.empty-state {
  text-align: center; padding: 48px 20px;
  color: var(--text-muted);
}
.empty-state i { font-size: 40px; display: block; margin-bottom: 12px; }
.empty-state p { font-size: 14px; }

/* ── Footer ── */
.footer {
  background: var(--gray-900); color: rgba(255,255,255,0.7);
  padding: 28px 0;
}
.footer__inner {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px;
}
.footer .navbar__logo, .footer .logo-accent { color: #fff; }
.footer__brand p { font-size: 12px; color: rgba(255,255,255,0.45); margin-top: 4px; }
.footer__links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer__links a { font-size: 13px; color: rgba(255,255,255,0.6); }
.footer__links a:hover { color: #fff; }

/* ── Responsive ── */
@media (max-width: 900px) {
  .hero__inner { grid-template-columns: 1fr; gap: 32px; }
  .hero__visual { flex-direction: row; flex-wrap: wrap; }
  .hero-card { flex: 1; min-width: 140px; }
  .about-grid { grid-template-columns: 1fr; }
  .about-visual { flex-direction: row; flex-wrap: wrap; }
  .about-visual__block { flex: 1; min-width: 140px; }
}

@media (max-width: 680px) {
  .navbar__links { display: none; }
  .navbar__links.open {
    display: flex; flex-direction: column; align-items: flex-start;
    position: absolute; top: 60px; left: 0; right: 0;
    background: var(--bg); border-bottom: 1px solid var(--border);
    padding: 12px 20px 16px; gap: 4px; z-index: 99;
  }
  .hamburger { display: block; }
  .hero { padding: 36px 0 32px; }
  .hero__title { font-size: 26px; }
  .courses-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
  .promo-banner__card { flex-direction: column; text-align: center; }
  .promo-banner .btn--teal { margin-left: 0; }
}