@charset "utf-8";

/* ============================================
   UK Biobank Style - ADRF Renewal
   Asian Dementia Research Foundation
   ============================================ */

/* ============================================
   1. CSS Variables (Design Tokens)
   ============================================ */
:root {
  /* Primary Colors - Purple (ADRF Brand) */
  --color-primary: #532075;
  --color-primary-dark: #3d1857;
  --color-primary-light: #6b2d95;

  /* Accent Colors */
  --color-accent: #F08700;
  --color-accent-dark: #D07600;
  --color-accent-light: #FFA020;

  /* Secondary Colors */
  --color-secondary: #a72475;
  --color-tertiary: #e08928;

  /* Neutral Colors */
  --color-white: #FFFFFF;
  --color-bg-light: #F4F6F8;
  --color-bg-cream: #f4efde;
  --color-gray-100: #f8f9fa;
  --color-gray-200: #e9ecef;
  --color-gray-300: #dee2e6;
  --color-gray-400: #ced4da;
  --color-gray-500: #adb5bd;
  --color-gray-600: #6c757d;
  --color-gray-700: #495057;
  --color-gray-800: #343a40;
  --color-gray-900: #212529;

  /* Text Colors */
  --color-text: #333333;
  --color-text-light: #666666;
  --color-text-muted: #999999;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;

  /* Typography */
  --font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;

  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Layout */
  --container-max-width: 1400px;
  --container-padding: 1.5rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;

  /* Z-index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
}

/* ============================================
   2. Reset & Base Styles
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
  list-style: none;
}

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

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-primary);
}

/* ============================================
   3. Utility Classes
   ============================================ */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.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;
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--color-primary); }
.text-accent { color: var(--color-accent); }
.text-white { color: var(--color-white); }
.text-muted { color: var(--color-text-muted); }

.bg-primary { background-color: var(--color-primary); }
.bg-accent { background-color: var(--color-accent); }
.bg-light { background-color: var(--color-bg-light); }
.bg-white { background-color: var(--color-white); }

/* ============================================
   4. Typography
   ============================================ */
.heading-1 {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-bold);
  line-height: 1.1;
}

.heading-2 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
}

.heading-3 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-semibold);
}

.heading-4 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
}

.lead {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-light);
  line-height: var(--line-height-relaxed);
}

.body-large {
  font-size: var(--font-size-lg);
}

.body-small {
  font-size: var(--font-size-sm);
}

.caption {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* ============================================
   5. Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
  border: 2px solid var(--color-primary);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: var(--color-white);
}

.btn-accent {
  background-color: var(--color-accent);
  color: var(--color-white);
  border: 2px solid var(--color-accent);
}

.btn-accent:hover {
  background-color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: var(--color-white);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-outline-white {
  background-color: transparent;
  color: var(--color-white);
  border: 2px solid var(--color-white);
}

.btn-outline-white:hover {
  background-color: var(--color-white);
  color: var(--color-primary);
}

.btn-lg {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: var(--font-size-lg);
}

.btn-sm {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
}

/* ============================================
   6. Header & Navigation
   ============================================ */
.ukb-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  background-color: var(--color-white);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-normal);
}

.ukb-header.scrolled {
  box-shadow: var(--shadow-md);
}

.ukb-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.ukb-header__logo {
  display: flex;
  align-items: center;
}

.ukb-header__logo img {
  height: 50px;
  width: auto;
}

.ukb-header__nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.ukb-nav__list {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.ukb-nav__item {
  position: relative;
}

.ukb-nav__link {
  display: flex;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-sm);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  transition: color var(--transition-fast);
}

.ukb-nav__link:hover,
.ukb-nav__link.active {
  color: var(--color-accent);
}

.ukb-nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 100%;
  height: 3px;
  background-color: var(--color-accent);
  transition: transform var(--transition-fast);
}

.ukb-nav__link:hover::after,
.ukb-nav__link.active::after {
  transform: translateX(-50%) scaleX(1);
}

/* Dropdown Menu (Mega Menu) */
.ukb-dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  min-width: 220px;
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-md) 0;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
}

.ukb-nav__item:hover .ukb-dropdown {
  opacity: 1;
  visibility: visible;
}

.ukb-dropdown__link {
  display: block;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-sm);
  color: var(--color-text);
  transition: all var(--transition-fast);
}

.ukb-dropdown__link:hover {
  background-color: var(--color-bg-light);
  color: var(--color-accent);
}

/* Header CTA Button */
.ukb-header__cta {
  margin-left: var(--spacing-lg);
}

/* Mobile Menu Toggle */
.ukb-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 30px;
  height: 30px;
  cursor: pointer;
}

.ukb-menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  transition: all var(--transition-fast);
}

/* ============================================
   7. Hero Section
   ============================================ */
.ukb-hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 80px;
  overflow: hidden;
}

.ukb-hero--full {
  min-height: 80vh;
  margin-top: 0;
  padding-top: 80px;
}

.ukb-hero__bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background-color: var(--color-primary);
}

.ukb-hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
}

.ukb-hero__overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(83, 32, 117, 0.85) 0%, rgba(107, 45, 149, 0.7) 100%);
}

.ukb-hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--spacing-4xl) var(--spacing-xl);
  max-width: 900px;
}

.ukb-hero__title {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  margin-bottom: var(--spacing-lg);
  line-height: 1.2;
}

.ukb-hero__subtitle {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-light);
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--spacing-2xl);
  line-height: var(--line-height-relaxed);
}

.ukb-hero__actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================
   8. Section Styles
   ============================================ */
.ukb-section {
  padding: var(--spacing-4xl) 0;
}

.ukb-section--gray {
  background-color: var(--color-bg-light);
}

.ukb-section--primary {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.ukb-section__header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.ukb-section__title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.ukb-section--primary .ukb-section__title {
  color: var(--color-white);
}

.ukb-section__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  max-width: 700px;
  margin: 0 auto;
}

.ukb-section--primary .ukb-section__subtitle {
  color: rgba(255, 255, 255, 0.8);
}

/* ============================================
   9. Card Components
   ============================================ */
.ukb-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.ukb-cards--3 {
  grid-template-columns: repeat(3, 1fr);
}

.ukb-cards--4 {
  grid-template-columns: repeat(4, 1fr);
}

.ukb-card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.ukb-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.ukb-card__image {
  position: relative;
  height: 200px;
  overflow: hidden;
}

.ukb-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.ukb-card:hover .ukb-card__image img {
  transform: scale(1.05);
}

.ukb-card__body {
  padding: var(--spacing-xl);
}

.ukb-card__tag {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent);
  background-color: rgba(240, 135, 0, 0.1);
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.ukb-card__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
  line-height: var(--line-height-tight);
}

.ukb-card__text {
  font-size: var(--font-size-base);
  color: var(--color-text-light);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-md);
}

.ukb-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent);
  transition: gap var(--transition-fast);
}

.ukb-card__link:hover {
  gap: var(--spacing-sm);
  color: var(--color-accent-dark);
}

.ukb-card__link svg {
  width: 16px;
  height: 16px;
}

/* Icon Card */
.ukb-card--icon {
  text-align: center;
  padding: var(--spacing-2xl);
}

.ukb-card--icon .ukb-card__icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-light);
  border-radius: var(--radius-full);
  color: var(--color-accent);
}

.ukb-card--icon .ukb-card__icon svg {
  width: 40px;
  height: 40px;
}

/* ============================================
   10. Feature Grid (For Researchers / For Participants)
   ============================================ */
.ukb-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-xl);
}

.ukb-feature {
  position: relative;
  padding: var(--spacing-3xl);
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 400px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.ukb-feature__bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}

.ukb-feature__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.ukb-feature__overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, rgba(83, 32, 117, 0.3) 0%, rgba(83, 32, 117, 0.9) 100%);
}

.ukb-feature__content {
  position: relative;
  z-index: 1;
}

.ukb-feature__label {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--spacing-sm);
}

.ukb-feature__title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
}

.ukb-feature__text {
  font-size: var(--font-size-base);
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--spacing-lg);
  line-height: var(--line-height-relaxed);
}

/* ============================================
   11. News Grid
   ============================================ */
.ukb-news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.ukb-news-card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.ukb-news-card:hover {
  box-shadow: var(--shadow-lg);
}

.ukb-news-card__image {
  position: relative;
  height: 220px;
  overflow: hidden;
}

.ukb-news-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.ukb-news-card:hover .ukb-news-card__image img {
  transform: scale(1.05);
}

.ukb-news-card__body {
  padding: var(--spacing-lg);
}

.ukb-news-card__date {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-sm);
}

.ukb-news-card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
  line-height: var(--line-height-tight);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.ukb-news-card__excerpt {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  line-height: var(--line-height-relaxed);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ============================================
   12. Stats Section
   ============================================ */
.ukb-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
}

.ukb-stat {
  text-align: center;
  padding: var(--spacing-xl);
}

.ukb-stat__number {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: var(--spacing-sm);
}

.ukb-stat__label {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-light);
}

.ukb-section--primary .ukb-stat__number {
  color: var(--color-white);
}

.ukb-section--primary .ukb-stat__label {
  color: rgba(255, 255, 255, 0.8);
}

/* ============================================
   13. Quick Links / Services
   ============================================ */
.ukb-services {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--spacing-lg);
}

.ukb-service {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  cursor: pointer;
}

.ukb-service:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.ukb-service__icon {
  width: 70px;
  height: 70px;
  margin: 0 auto var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-light);
  border-radius: var(--radius-full);
  transition: background-color var(--transition-fast);
}

.ukb-service:hover .ukb-service__icon {
  background-color: var(--color-accent);
}

.ukb-service__icon img {
  width: 35px;
  height: 35px;
  transition: filter var(--transition-fast);
}

.ukb-service:hover .ukb-service__icon img {
  filter: brightness(0) invert(1);
}

.ukb-service__title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
}

/* ============================================
   14. Notice / Announcement Section
   ============================================ */
.ukb-notice-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
}

.ukb-notice-list {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
}

.ukb-notice-list__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--color-primary);
}

.ukb-notice-list__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
}

.ukb-notice-list__more {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.ukb-notice-list__more:hover {
  color: var(--color-accent);
}

.ukb-notice-item {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-gray-200);
}

.ukb-notice-item:last-child {
  border-bottom: none;
}

.ukb-notice-item__title {
  font-size: var(--font-size-base);
  color: var(--color-text);
  flex: 1;
  padding-right: var(--spacing-md);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color var(--transition-fast);
}

.ukb-notice-item__title:hover {
  color: var(--color-accent);
}

.ukb-notice-item__date {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  white-space: nowrap;
}

/* ============================================
   15. Footer
   ============================================ */
.ukb-footer {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-4xl) 0 var(--spacing-xl);
}

.ukb-footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-3xl);
}

.ukb-footer__logo {
  margin-bottom: var(--spacing-lg);
}

.ukb-footer__logo img {
  height: 50px;
  filter: brightness(0) invert(1);
}

.ukb-footer__desc {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.7);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-lg);
}

.ukb-footer__title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-white);
  margin-bottom: var(--spacing-lg);
}

.ukb-footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.ukb-footer__link {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition-fast);
}

.ukb-footer__link:hover {
  color: var(--color-white);
}

.ukb-footer__contact {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.7);
  line-height: var(--line-height-relaxed);
}

.ukb-footer__contact strong {
  color: var(--color-white);
  font-weight: var(--font-weight-semibold);
  display: block;
  margin-bottom: var(--spacing-xs);
}

.ukb-footer__social {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.ukb-footer__social a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  transition: background-color var(--transition-fast);
}

.ukb-footer__social a:hover {
  background-color: var(--color-accent);
}

.ukb-footer__bottom {
  margin-top: var(--spacing-3xl);
  padding-top: var(--spacing-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.ukb-footer__copyright {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.5);
}

.ukb-footer__partners {
  display: flex;
  gap: var(--spacing-xl);
  align-items: center;
}

.ukb-footer__partners img {
  height: 40px;
  opacity: 0.7;
  filter: brightness(0) invert(1);
  transition: opacity var(--transition-fast);
}

.ukb-footer__partners img:hover {
  opacity: 1;
}

/* ============================================
   16. Responsive Design
   ============================================ */

/* Tablet */
@media screen and (max-width: 1024px) {
  :root {
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.5rem;
  }

  .ukb-cards--3,
  .ukb-cards--4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .ukb-features {
    grid-template-columns: 1fr;
  }

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

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

  .ukb-services {
    grid-template-columns: repeat(3, 1fr);
  }

  .ukb-notice-section {
    grid-template-columns: 1fr;
  }

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

/* Mobile */
@media screen and (max-width: 768px) {
  :root {
    --font-size-5xl: 2rem;
    --font-size-4xl: 1.75rem;
    --font-size-3xl: 1.375rem;
    --container-padding: 1rem;
  }

  .ukb-header__nav {
    display: none;
  }

  .ukb-menu-toggle {
    display: flex;
  }

  .ukb-header__inner {
    height: 60px;
  }

  .ukb-header__logo img {
    height: 40px;
  }

  .ukb-hero {
    margin-top: 60px;
    min-height: 60vh;
  }

  .ukb-hero__content {
    padding: var(--spacing-2xl) var(--spacing-md);
  }

  .ukb-hero__title {
    font-size: var(--font-size-3xl);
  }

  .ukb-hero__subtitle {
    font-size: var(--font-size-base);
  }

  .ukb-hero__actions {
    flex-direction: column;
    align-items: center;
  }

  .ukb-section {
    padding: var(--spacing-2xl) 0;
  }

  .ukb-cards,
  .ukb-cards--3,
  .ukb-cards--4 {
    grid-template-columns: 1fr;
  }

  .ukb-news-grid {
    grid-template-columns: 1fr;
  }

  .ukb-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
  }

  .ukb-stat__number {
    font-size: var(--font-size-3xl);
  }

  .ukb-services {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
  }

  .ukb-feature {
    min-height: 300px;
    padding: var(--spacing-xl);
  }

  .ukb-footer__inner {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .ukb-footer__bottom {
    flex-direction: column;
    gap: var(--spacing-lg);
    text-align: center;
  }
}

/* Small Mobile */
@media screen and (max-width: 480px) {
  .ukb-services {
    grid-template-columns: 1fr;
  }

  .ukb-stats {
    grid-template-columns: 1fr;
  }

  .btn-lg {
    width: 100%;
  }
}

/* ============================================
   17. Mobile Navigation
   ============================================ */
.ukb-mobile-nav {
  position: fixed;
  top: 0;
  left: -100%;
  width: 100%;
  max-width: 320px;
  height: 100vh;
  background-color: var(--color-white);
  z-index: var(--z-modal);
  transition: left var(--transition-normal);
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
}

.ukb-mobile-nav.open {
  left: 0;
}

.ukb-mobile-nav__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  background-color: var(--color-primary);
  color: var(--color-white);
}

.ukb-mobile-nav__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
}

.ukb-mobile-nav__close {
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.ukb-mobile-nav__list {
  padding: var(--spacing-md);
}

.ukb-mobile-nav__item {
  border-bottom: 1px solid var(--color-gray-200);
}

.ukb-mobile-nav__link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
}

.ukb-mobile-nav__submenu {
  display: none;
  background-color: var(--color-bg-light);
  padding: var(--spacing-sm) 0;
}

.ukb-mobile-nav__item.active .ukb-mobile-nav__submenu {
  display: block;
}

.ukb-mobile-nav__sublink {
  display: block;
  padding: var(--spacing-sm) var(--spacing-xl);
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

.ukb-mobile-nav__sublink:hover {
  color: var(--color-accent);
  background-color: var(--color-white);
}

.ukb-mobile-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: calc(var(--z-modal) - 1);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.ukb-mobile-overlay.open {
  opacity: 1;
  visibility: visible;
}

/* ============================================
   18. Animation Classes
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

.slide-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.slide-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.slide-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.slide-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Stagger animations for cards */
.ukb-cards > *:nth-child(1) { transition-delay: 0ms; }
.ukb-cards > *:nth-child(2) { transition-delay: 100ms; }
.ukb-cards > *:nth-child(3) { transition-delay: 200ms; }
.ukb-cards > *:nth-child(4) { transition-delay: 300ms; }

/* ============================================
   19. Sub Page Styles
   ============================================ */

/* Sub Hero */
.ukb-sub-hero {
  position: relative;
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 80px;
  overflow: hidden;
}

.ukb-sub-hero__bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}

.ukb-sub-hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.ukb-sub-hero__overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(83, 32, 117, 0.9) 0%, rgba(107, 45, 149, 0.8) 100%);
}

.ukb-sub-hero__content {
  position: relative;
  z-index: 1;
  width: 100%;
  text-align: center;
  padding: var(--spacing-3xl) 0;
}

.ukb-sub-hero__title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
}

/* Breadcrumb */
.ukb-breadcrumb {
  display: flex;
  justify-content: center;
}

.ukb-breadcrumb__list {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  justify-content: center;
}

.ukb-breadcrumb__item {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.7);
}

.ukb-breadcrumb__item:not(:last-child)::after {
  content: '>';
  margin-left: var(--spacing-sm);
  color: rgba(255, 255, 255, 0.5);
}

.ukb-breadcrumb__item--current {
  color: var(--color-white);
  font-weight: var(--font-weight-medium);
}

/* Content Area */
.ukb-content {
  max-width: 900px;
  margin: 0 auto;
}

.ukb-content h2 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 3px solid var(--color-accent);
}

.ukb-content h3 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-md);
}

.ukb-content h4 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-sm);
}

.ukb-content p {
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
}

.ukb-content ul,
.ukb-content ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-xl);
}

.ukb-content ul {
  list-style-type: disc;
}

.ukb-content ol {
  list-style-type: decimal;
}

.ukb-content li {
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.ukb-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: var(--spacing-lg) 0;
}

.ukb-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-lg) 0;
}

.ukb-content th,
.ukb-content td {
  padding: var(--spacing-md);
  text-align: left;
  border: 1px solid var(--color-gray-300);
}

.ukb-content th {
  background-color: var(--color-primary);
  color: var(--color-white);
  font-weight: var(--font-weight-semibold);
}

.ukb-content tr:nth-child(even) {
  background-color: var(--color-bg-light);
}

/* Info Box */
.ukb-info-box {
  background-color: var(--color-bg-light);
  border-left: 4px solid var(--color-accent);
  padding: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.ukb-info-box__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.ukb-info-box__content {
  font-size: var(--font-size-base);
  color: var(--color-text);
  line-height: var(--line-height-relaxed);
}

/* Contact Box */
.ukb-contact-box {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-lg);
  margin: var(--spacing-2xl) 0;
  text-align: center;
}

.ukb-contact-box__title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-md);
}

.ukb-contact-box__phone {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent-light);
  margin-bottom: var(--spacing-md);
}

.ukb-contact-box__desc {
  font-size: var(--font-size-base);
  color: rgba(255, 255, 255, 0.8);
}

/* Sub Page Sidebar Layout */
.ukb-sub-layout {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: var(--spacing-3xl);
}

.ukb-sidebar {
  position: sticky;
  top: 100px;
  align-self: start;
}

.ukb-sidebar__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  padding: var(--spacing-md);
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.ukb-sidebar__nav {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-top: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  overflow: hidden;
}

.ukb-sidebar__link {
  display: block;
  padding: var(--spacing-md);
  font-size: var(--font-size-base);
  color: var(--color-text);
  border-bottom: 1px solid var(--color-gray-200);
  transition: all var(--transition-fast);
}

.ukb-sidebar__link:last-child {
  border-bottom: none;
}

.ukb-sidebar__link:hover {
  background-color: var(--color-bg-light);
  color: var(--color-accent);
}

.ukb-sidebar__link.active {
  background-color: var(--color-accent);
  color: var(--color-white);
}

/* Sub Page Responsive */
@media screen and (max-width: 1024px) {
  .ukb-sub-layout {
    grid-template-columns: 1fr;
  }

  .ukb-sidebar {
    position: static;
  }
}

@media screen and (max-width: 768px) {
  .ukb-sub-hero {
    margin-top: 60px;
    min-height: 200px;
  }

  .ukb-sub-hero__title {
    font-size: var(--font-size-2xl);
  }

  .ukb-sub-hero__content {
    padding: var(--spacing-2xl) 0;
  }

  .ukb-content h2 {
    font-size: var(--font-size-2xl);
  }

  .ukb-content h3 {
    font-size: var(--font-size-xl);
  }
}

/* ============================================
   20. Print Styles
   ============================================ */
@media print {
  .ukb-header,
  .ukb-footer,
  .ukb-mobile-nav,
  .ukb-mobile-overlay,
  .ukb-sidebar {
    display: none !important;
  }

  .ukb-hero,
  .ukb-sub-hero {
    min-height: auto;
    margin-top: 0;
  }

  .ukb-hero__overlay,
  .ukb-sub-hero__overlay {
    background: none;
  }

  .ukb-hero__title,
  .ukb-sub-hero__title {
    color: var(--color-primary);
  }

  body {
    font-size: 12pt;
    line-height: 1.5;
  }

  a {
    text-decoration: underline;
  }

  .btn {
    border: 1px solid currentColor;
  }
}