/* 
 * Main Stylesheet
 * 어린이도서연구회 은평지회 25주년 기념 웹사이트
 */

/* ==========================================================================
   Imports
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;700;900&family=Jua&display=swap');
@import url('variables.css');
@import url('reset.css');
@import url('components.css');
@import url('animations.css');
@import url('utilities.css');
@import url('performance.css');
@import url('responsive.css');
@import url('index.css');
@import url('glassmorphism.css');

/* ==========================================================================
   Base Layout
   ========================================================================== */

body {
  background-color: var(--color-background);
  background-image: 
    radial-gradient(circle at 20% 80%, rgba(244, 164, 96, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(143, 188, 143, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 40% 40%, rgba(210, 105, 30, 0.03) 0%, transparent 50%);
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    repeating-linear-gradient(
      45deg,
      transparent,
      transparent 35px,
      rgba(210, 105, 30, 0.02) 35px,
      rgba(210, 105, 30, 0.02) 70px
    );
  pointer-events: none;
  z-index: 0;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-4);
  position: relative;
  z-index: 1;
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-6);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--space-8);
  }
}

/* ==========================================================================
   Header Styles
   ========================================================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  background: linear-gradient(
    to bottom,
    rgba(255, 248, 243, 0.98),
    rgba(255, 245, 238, 0.95)
  );
  backdrop-filter: blur(var(--blur-lg));
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition-all);
  box-shadow: 0 2px 20px rgba(210, 105, 30, 0.08);
}

.header.scrolled {
  box-shadow: 0 4px 30px rgba(210, 105, 30, 0.12);
  background: linear-gradient(
    to bottom,
    rgba(255, 248, 243, 0.99),
    rgba(255, 245, 238, 0.98)
  );
}

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

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-text-primary);
  text-decoration: none;
  transition: var(--transition-transform);
}

.header__logo:hover {
  transform: translateY(-2px);
}

.header__logo-image {
  height: 48px;
  width: auto;
  object-fit: contain;
}

/* Navigation */
.nav {
  display: none;
}

@media (min-width: 1024px) {
  .nav {
    display: flex;
    gap: var(--space-8);
  }
}

.nav__link {
  position: relative;
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  transition: var(--transition-colors);
  padding: var(--space-2) 0;
}

.nav__link:hover {
  color: var(--color-primary);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--duration-normal) var(--ease-out);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  transition: var(--transition-all);
}

@media (min-width: 1024px) {
  .mobile-menu-btn {
    display: none;
  }
}

.mobile-menu-btn:hover {
  background: var(--color-background-alt);
}

.mobile-menu-btn svg {
  width: 24px;
  height: 24px;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-20) 0;
  overflow: hidden;
  background: linear-gradient(135deg, 
    rgba(255, 107, 107, 0.1) 0%, 
    rgba(255, 217, 61, 0.1) 50%, 
    rgba(107, 207, 127, 0.1) 100%);
}

.hero__background {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero__leaves {
  position: absolute;
  width: 100%;
  height: 100%;
}

.hero__content {
  text-align: center;
  max-width: 800px;
}

.hero__logo {
  width: clamp(150px, 20vw, 200px);
  height: auto;
  margin: 0 auto var(--space-6);
  display: block;
  filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.1));
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-secondary);
  color: var(--color-text-primary);
  border-radius: var(--radius-full);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-6);
  animation: float 3s ease-in-out infinite;
}

.hero__title {
  font-size: clamp(2rem, 5vw, var(--text-5xl));
  font-weight: var(--font-black);
  margin-bottom: var(--space-6);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.hero__subtitle {
  font-size: clamp(1.125rem, 3vw, var(--text-2xl));
  color: var(--color-text-secondary);
  margin-bottom: var(--space-8);
  font-weight: var(--font-light);
}

.hero__description {
  font-size: clamp(1rem, 2vw, var(--text-lg));
  color: var(--color-text-secondary);
  margin-bottom: var(--space-10);
  line-height: var(--leading-relaxed);
  max-width: 90%;
  margin-left: auto;
  margin-right: auto;
}

.hero__actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* ==========================================================================
   Section Styles
   ========================================================================== */

.section {
  padding: clamp(3rem, 10vw, var(--space-20)) 0;
  position: relative;
}

.section--alt {
  background: linear-gradient(
    135deg,
    var(--color-background-alt) 0%,
    var(--color-background-dark) 100%
  );
  position: relative;
}

.section--alt::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(210, 105, 30, 0.2) 50%,
    transparent 100%
  );
}

.section--alt::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(210, 105, 30, 0.2) 50%,
    transparent 100%
  );
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section__title {
  font-size: clamp(1.875rem, 4vw, var(--text-4xl));
  margin-bottom: var(--space-4);
  position: relative;
  display: inline-block;
}

.section__title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
}

.section__subtitle {
  font-size: var(--text-xl);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ==========================================================================
   About Section
   ========================================================================== */

.about__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-16);
}

.about__card {
  text-align: center;
  padding: var(--space-8);
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.9),
    rgba(255, 248, 243, 0.9)
  );
  border-radius: var(--radius-xl);
  box-shadow: 
    0 4px 20px rgba(210, 105, 30, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(210, 105, 30, 0.1);
  transition: var(--transition-all);
  position: relative;
  overflow: hidden;
}

.about__card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(
    circle,
    rgba(244, 164, 96, 0.1) 0%,
    transparent 70%
  );
  transform: rotate(45deg);
  transition: var(--transition-transform);
}

.about__card:hover {
  transform: translateY(-4px);
  box-shadow: 
    0 8px 30px rgba(210, 105, 30, 0.15),
    inset 0 1px 0 rgba(255, 255, 255, 0.5);
  border-color: rgba(210, 105, 30, 0.2);
}

.about__card:hover::before {
  transform: rotate(45deg) scale(1.5);
}

.about__icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-6);
  padding: var(--space-4);
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-3xl);
}

.about__card-title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-4);
}

.about__card-description {
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

/* ==========================================================================
   Timeline Section
   ========================================================================== */

.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 100%;
  background: var(--color-border);
}

@media (max-width: 767px) {
  .timeline::before {
    left: 30px;
  }
}

.timeline__item {
  position: relative;
  padding: var(--space-8) 0;
}

.timeline__content {
  position: relative;
  width: calc(50% - 40px);
  padding: var(--space-6);
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.timeline__item:nth-child(odd) .timeline__content {
  margin-left: auto;
}

@media (max-width: 767px) {
  .timeline__content {
    width: calc(100% - 80px);
    margin-left: 60px !important;
  }
}

.timeline__dot {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 20px;
  height: 20px;
  background: var(--color-primary);
  border: 4px solid var(--color-background);
  border-radius: var(--radius-full);
  z-index: 1;
}

@media (max-width: 767px) {
  .timeline__dot {
    left: 30px;
  }
}

.timeline__year {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.timeline__title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}

.timeline__description {
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

/* ==========================================================================
   Program Section
   ========================================================================== */

.program__schedule {
  display: grid;
  gap: var(--space-4);
  max-width: 800px;
  margin: 0 auto;
}

.program__item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: var(--space-6);
  padding: var(--space-6);
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-all);
}

.program__item:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.program__time {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-primary);
}

.program__content h3 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-2);
}

.program__content p {
  color: var(--color-text-secondary);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
  background: linear-gradient(
    135deg,
    var(--color-text-primary) 0%,
    #2C1F1A 100%
  );
  color: white;
  padding: var(--space-16) 0 var(--space-8);
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(210, 105, 30, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(244, 164, 96, 0.08) 0%, transparent 50%);
  pointer-events: none;
}

.footer__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-12);
}

.footer__section h3 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
  color: white;
}

.footer__section p,
.footer__section a {
  color: rgba(255, 255, 255, 0.8);
  line-height: var(--leading-relaxed);
}

.footer__section a:hover {
  color: white;
}

.footer__social {
  display: flex;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.footer__social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.8);
  transition: var(--transition-all);
}

.footer__social a:hover {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  transform: translateY(-2px);
}

.footer__social svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.footer__bottom {
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
}

.footer__bottom p {
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--text-sm);
}

/* ==========================================================================
   Loading Screen
   ========================================================================== */

.loading-screen {
  position: fixed;
  inset: 0;
  z-index: var(--z-top);
  background: white;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: var(--space-6);
  transition: opacity 0.3s ease-out;
}

.loading-screen.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-screen__logo {
  width: 120px;
  height: 120px;
  animation: pulse 1.5s ease-in-out infinite;
}

.loading-screen__text {
  font-size: var(--text-xl);
  color: var(--color-text-secondary);
  animation: fade-in-out 1.5s ease-in-out infinite;
}

/* ==========================================================================
   Mobile Navigation
   ========================================================================== */

.mobile-nav {
  position: fixed;
  top: 0;
  right: -100%;
  width: min(100%, 320px);
  height: 100vh;
  background: white;
  box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
  z-index: var(--z-modal);
  transition: right var(--duration-normal) var(--ease-out);
  overflow-y: auto;
}

.mobile-nav--open {
  right: 0;
}

.mobile-nav__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

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

.mobile-nav__close {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  transition: var(--transition-all);
}

.mobile-nav__close:hover {
  background: var(--color-background-alt);
}

.mobile-nav__body {
  padding: var(--space-4);
}

.mobile-nav__link {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: var(--transition-all);
}

.mobile-nav__link:hover,
.mobile-nav__link.active {
  background: var(--color-background-alt);
  color: var(--color-primary);
}

/* ==========================================================================
   Mobile Specific Styles
   ========================================================================== */

@media (max-width: 767px) {
  .hero {
    min-height: 90vh;
    padding: var(--space-16) 0;
  }

  .hero__actions {
    flex-direction: column;
    width: 100%;
  }

  .hero__actions .btn {
    width: 100%;
  }

  .about__grid,
  .event-info__grid,
  .features__grid {
    grid-template-columns: 1fr;
  }

  .program__item {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer__social {
    justify-content: center;
  }

  /* CTA countdown mobile optimization */
  .cta__countdown {
    gap: var(--space-2);
  }

  .countdown__item {
    padding: var(--space-2);
  }

  .countdown__value {
    font-size: var(--text-2xl);
  }

  .countdown__label {
    font-size: var(--text-xs);
  }
}

/* Touch device optimizations */
@media (hover: none) {
  .btn:active {
    transform: scale(0.98);
  }

  .card:active,
  .feature-card:active {
    transform: scale(0.98);
  }
}

/* Performance optimizations */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ==========================================================================
   Dark Mode Optimizations
   ========================================================================== */

@media (prefers-color-scheme: dark) {
  /* Body Background Adjustments */
  body {
    background-image: 
      radial-gradient(circle at 20% 80%, rgba(249, 115, 22, 0.08) 0%, transparent 50%),
      radial-gradient(circle at 80% 20%, rgba(16, 185, 129, 0.08) 0%, transparent 50%),
      radial-gradient(circle at 40% 40%, rgba(251, 191, 36, 0.05) 0%, transparent 50%);
  }

  body::before {
    background-image: 
      repeating-linear-gradient(
        45deg,
        transparent,
        transparent 35px,
        rgba(249, 115, 22, 0.03) 35px,
        rgba(249, 115, 22, 0.03) 70px
      );
  }

  /* Header Dark Mode */
  .header {
    background: linear-gradient(
      to bottom,
      rgba(15, 15, 35, 0.98),
      rgba(26, 27, 58, 0.95)
    );
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
  }

  .header.scrolled {
    background: linear-gradient(
      to bottom,
      rgba(15, 15, 35, 0.99),
      rgba(26, 27, 58, 0.98)
    );
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
  }

  /* Navigation Links */
  .nav__link {
    color: var(--color-text-secondary);
    transition: var(--transition-colors);
  }

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

  /* Button Enhancements */
  .btn--primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #FFFFFF;
    border: 2px solid var(--color-primary);
    font-weight: var(--font-semibold);
  }

  .btn--primary:hover {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(var(--color-primary-rgb), 0.4);
  }

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

  .btn--secondary:hover {
    background: var(--color-background-alt);
    border-color: var(--color-primary);
    color: var(--color-primary);
  }

  /* Card Enhancements */
  .card,
  .feature-card,
  .game-card,
  .activity-card,
  .stat-card {
    background: var(--color-background-alt);
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
  }

  .card:hover,
  .feature-card:hover,
  .game-card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 20px 40px rgba(var(--color-primary-rgb), 0.2);
  }

  /* Text Enhancements */
  h1, h2, h3, h4, h5, h6 {
    color: var(--color-text-primary);
    font-weight: var(--font-bold);
  }

  p, li {
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
  }

  /* Timeline Dark Mode */
  .timeline::before {
    background: linear-gradient(180deg, 
      var(--color-primary) 0%, 
      var(--color-secondary) 50%, 
      var(--color-accent) 100%);
  }

  .timeline__content {
    background: var(--color-background-alt);
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
  }

  .timeline__content:hover {
    border-color: var(--color-primary);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  }

  .timeline__badge {
    background: var(--color-background-alt);
    border: 2px solid var(--color-primary);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
  }

  /* FAQ Dark Mode Enhancement */
  .faq-item {
    background: var(--color-background-alt);
    border: 1px solid var(--color-border);
  }

  .faq-item:hover {
    border-color: var(--color-primary);
  }

  .faq-item__question {
    color: var(--color-text-primary);
  }

  .faq-item__question:hover {
    background: rgba(var(--color-primary-rgb), 0.1);
  }

  .faq-topic-icon {
    background: rgba(var(--color-primary-rgb), 0.2);
    color: var(--color-primary);
  }

  .faq-item__answer p {
    color: var(--color-text-secondary);
  }

  /* Footer Dark Mode */
  .footer {
    background: var(--color-background-dark);
    border-top: 1px solid var(--color-border);
  }

  .footer h3 {
    color: var(--color-text-primary);
  }

  .footer p,
  .footer li {
    color: var(--color-text-secondary);
  }

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

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

  /* Form Elements */
  input,
  textarea,
  select {
    background: var(--color-background-alt);
    border: 2px solid var(--color-border);
    color: var(--color-text-primary);
  }

  input:focus,
  textarea:focus,
  select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.2);
  }

  /* Image Optimization for Dark Mode */
  img {
    border-radius: var(--radius-lg);
  }

  /* Enhanced Contrast for Important Elements */
  .page-header__title {
    color: var(--color-text-primary);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  }

  .section__title {
    color: var(--color-text-primary);
  }

  .section__subtitle {
    color: var(--color-text-secondary);
  }

  /* Loading States and Interactions */
  .loading {
    background: linear-gradient(90deg, 
      var(--color-background-alt) 25%, 
      var(--color-border) 50%, 
      var(--color-background-alt) 75%
    );
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
  }

  @keyframes loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
  }
}