/* ==========================================
   DrSkin Academy - Base Styles
   ==========================================
   Brand-level CSS dùng chung cho mọi trang.
   File này chuyển sang WordPress sẽ map vào:
   - wp-content/themes/drskin/assets/css/base.css
   - Hoặc gộp vào theme/style.css
   ========================================== */

/* ---------- 1. CSS VARIABLES (BRAND TOKENS) ---------- */
:root {
  /* Brand colors */
  --navy: #0E1E34;
  --navy-dark: #08142A;
  --gold: #BC913A;
  --gold-hover: #D4A348;
  --gold-dark: #A47F2E;
  --cream: #F5EFE0;
  --cream-deep: #EDE4CF;
  --terra: #A84030; /* CHỈ DÙNG CHO MEDICAL WARNINGS */

  /* Text colors */
  --text: #1a1a1a;
  --text-muted: #5c5c5c;
  --text-light: #8a8a8a;

  /* Backgrounds */
  --bg: #ffffff;
  --bg-soft: #fafafa;

  /* Borders */
  --border: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.12);

  /* Typography */
  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans: 'Be Vietnam Pro', system-ui, -apple-system, sans-serif;
  --font-body: 'Source Serif 4', 'Source Serif Pro', Georgia, serif;

  /* Layout */
  --maxw: 1200px;
  --header-height: 72px;

  /* Spacing scale */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-2xl: 64px;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Transitions */
  --transition: 0.2s ease;
}

/* ---------- 2. RESET ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

a {
  color: var(--navy);
  text-decoration: none;
  transition: color var(--transition);
}

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

/* ---------- 3. LAYOUT UTILITIES ---------- */
.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 64px 0;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 16px;
}

.section-sub {
  font-size: 18px;
  color: var(--text-muted);
  margin-bottom: 48px;
}

.page-header {
  padding: 80px 0 48px;
  background: linear-gradient(180deg, var(--cream) 0%, var(--bg) 100%);
  text-align: center;
}

.page-title {
  font-family: var(--font-serif);
  font-size: 48px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 16px;
}

.page-sub {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto;
}

/* ---------- 4. HEADER / NAVIGATION ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #ffffff;
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 18px;
  color: var(--navy);
}

.logo-img {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

.nav-items {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-items a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  transition: color var(--transition);
}

.nav-items a:hover,
.nav-items a.active {
  color: var(--gold);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  background: var(--gold);
  color: #fff !important;
  font-weight: 600;
  font-size: 14px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.nav-cta:hover {
  background: var(--gold-hover);
  color: #fff !important;
}

.nav-phone {
  font-size: 14px;
  color: var(--text-muted);
}

/* Hamburger - mobile */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  padding: 0;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  min-height: 2px;
  flex-shrink: 0;
  background: var(--navy);
  transition: transform var(--transition), opacity var(--transition);
}

.hamburger.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* User menu (for logged-in area) */
.user-menu .user-avatar-name {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ---------- 5. BUTTONS ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: all var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--gold);
  color: #fff;
}

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

.btn-secondary {
  background: var(--navy);
  color: #fff;
}

.btn-secondary:hover {
  background: var(--navy-dark);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--navy);
  border-color: var(--navy);
}

.btn-outline:hover {
  background: var(--navy);
  color: #fff;
}

/* ---------- 6. FOOTER ---------- */
.footer {
  background: var(--navy);
  color: #fff;
  padding: 64px 0 32px;
  margin-top: 80px;
}

.footer a {
  color: rgba(255, 255, 255, 0.7);
}

.footer a:hover {
  color: var(--gold);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-title {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer-list {
  list-style: none;
  padding: 0;
}

.footer-list li {
  margin-bottom: 10px;
}

.footer-list a {
  font-size: 14px;
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
}

/* ---------- 7. STICKY MOBILE CTA ---------- */
.sticky-mobile {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 14px;
  background: var(--gold);
  color: #fff !important;
  text-align: center;
  font-weight: 600;
  z-index: 99;
  box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.1);
}

/* ---------- 8. FORMS ---------- */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 14px;
  font-family: inherit;
  font-size: 15px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: #fff;
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--gold);
}

.form-group .error {
  font-size: 13px;
  color: var(--terra);
  margin-top: 4px;
  display: none;
}

.form-group.has-error .error {
  display: block;
}

.form-group.has-error input,
.form-group.has-error textarea {
  border-color: var(--terra);
}

/* ---------- 9. RESPONSIVE ---------- */
@media (max-width: 900px) {
  .nav-items {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  }

  .nav-items.active {
    display: flex;
  }

  .hamburger {
    display: flex;
  }

  .nav-cta,
  .nav-phone {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 28px 20px;
  }
  .footer-col:first-child {
    grid-column: 1 / -1;
  }
  .footer-col:nth-child(3) {
    display: none;
  }

  .page-title {
    font-size: 32px;
  }

  .section-title {
    font-size: 28px;
  }

  .section {
    padding: 48px 0;
  }

  .sticky-mobile {
    display: block;
  }

  /* Add padding to body bottom to account for sticky-mobile */
  body {
    padding-bottom: 60px;
  }
}

@media (max-width: 600px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .page-title {
    font-size: 28px;
  }
}

/* ---------- 10. ACCESSIBILITY ---------- */
:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.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;
}

/* ---------- 11. PRINT ---------- */
@media print {
  .header,
  .footer,
  .sticky-mobile,
  .nav-cta {
    display: none !important;
  }

  body {
    color: #000;
    background: #fff;
  }
}