/* ===================================
   CSS Custom Properties & Design Tokens
   =================================== */
:root {
  /* Color Palette - Red/Orange Theme */
  --color-primary: #ef4444;
  --color-primary-light: #f97316;
  --color-primary-lighter: #fb923c;
  --color-accent: #dc2626;
  --color-accent-light: #fb7185;

  /* Background Colors - Light Theme */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-tertiary: #f1f5f9;
  --color-bg-card: rgba(255, 255, 255, 0.9);

  /* Text Colors */
  --color-text-primary: #1e293b;
  --color-text-secondary: #475569;
  --color-text-tertiary: #64748b;
  --color-text-light: #94a3b8;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #ef4444 0%, #f97316 50%, #fb923c 100%);
  --gradient-accent: linear-gradient(135deg, #dc2626 0%, #ef4444 100%);
  --gradient-bg: linear-gradient(180deg, #ffffff 0%, #fef2f2 50%, #fff7ed 100%);

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

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 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: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;

  /* 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);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 30px rgba(239, 68, 68, 0.3);

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
}

/* ===================================
   Reset & Base Styles
   =================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--gradient-bg);
  background-attachment: fixed;
  overflow-x: hidden;
}

/* ===================================
   Typography
   =================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--font-size-5xl);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: var(--font-size-4xl);
  color: var(--color-text-primary);
}

h3 {
  font-size: var(--font-size-2xl);
  color: var(--color-text-primary);
}

h4 {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: all var(--transition-base);
}

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

/* ===================================
   Navigation
   =================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

.navbar.scrolled {
  box-shadow: var(--shadow-lg);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-sm) var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
}

.nav-link {
  color: var(--color-text-primary);
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  text-decoration: none;
  text-align: center;
  display: inline-block;
}

.nav-link:hover,
.nav-link.active {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(249, 115, 22, 0.1));
  color: var(--color-primary);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: var(--font-size-2xl);
  color: var(--color-text-primary);
  cursor: pointer;
}

/* ===================================
   Hero Section
   =================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-3xl) var(--spacing-lg);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(239, 68, 68, 0.15), transparent);
  border-radius: 50%;
  animation: float 20s ease-in-out infinite;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(249, 115, 22, 0.15), transparent);
  border-radius: 50%;
  animation: float 15s ease-in-out infinite reverse;
}

@keyframes float {

  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }

  50% {
    transform: translate(30px, -30px) scale(1.1);
  }
}

.hero-content {
  max-width: 900px;
  position: relative;
  z-index: 1;
  animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  margin-bottom: var(--spacing-lg);
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  font-weight: 500;
}

.hero-cta {
  display: inline-flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  justify-content: center;
}

.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-xl);
  font-weight: 600;
  font-size: var(--font-size-lg);
  transition: all var(--transition-base);
  cursor: pointer;
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-lg);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
  text-decoration: none;
}

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

.btn-secondary:hover {
  background: var(--color-primary);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  text-decoration: none;
}

/* ===================================
   Section Styles
   =================================== */
.section {
  padding: var(--spacing-3xl) var(--spacing-lg);
  max-width: 1200px;
  margin: 0 auto;
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease-out;
}

.section.visible {
  opacity: 1;
  transform: translateY(0);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-title {
  position: relative;
  display: inline-block;
  padding-bottom: var(--spacing-sm);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: var(--radius-sm);
}

.section-description {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 800px;
  margin: var(--spacing-lg) auto 0;
}

/* ===================================
   Card Styles
   =================================== */
.card {
  background: var(--color-bg-card);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  border: 1px solid rgba(239, 68, 68, 0.1);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(239, 68, 68, 0.3);
}

.card-title {
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.card-icon {
  font-size: var(--font-size-2xl);
}

/* ===================================
   Topics Grid
   =================================== */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

.topic-card {
  background: var(--color-bg-card);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  border: 1px solid rgba(239, 68, 68, 0.1);
}

.topic-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(239, 68, 68, 0.3);
}

.topic-card h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-2xl);
}

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

.topic-list li {
  padding: 0.25rem 0;
  padding-left: var(--spacing-lg);
  position: relative;
  color: var(--color-text-secondary);
}

.topic-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 700;
}

/* ===================================
   Timeline Styles
   =================================== */
.timeline {
  position: relative;
  max-width: 800px;
  margin: var(--spacing-2xl) auto;
  padding-left: var(--spacing-xl);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--gradient-primary);
  border-radius: var(--radius-sm);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--spacing-xl);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -30px;
  top: 5px;
  width: 16px;
  height: 16px;
  background: var(--color-primary);
  border: 3px solid white;
  border-radius: 50%;
  box-shadow: var(--shadow-md);
}

.timeline-date {
  font-weight: 700;
  color: var(--color-primary);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-xs);
}

.timeline-content {
  background: var(--color-bg-card);
  backdrop-filter: blur(10px);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(239, 68, 68, 0.1);
  transition: all var(--transition-base);
}

.timeline-content:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(239, 68, 68, 0.3);
}

/* ===================================
   Editorial Board
   =================================== */
.editors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.editor-card {
  background: var(--color-bg-card);
  backdrop-filter: blur(10px);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(239, 68, 68, 0.1);
  transition: all var(--transition-base);
}

.editor-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(239, 68, 68, 0.3);
}

.editor-name {
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.editor-affiliation {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-xs);
}

.editor-email {
  color: var(--color-primary);
  font-size: var(--font-size-sm);
}

.board-members {
  background: var(--color-bg-card);
  backdrop-filter: blur(10px);
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(239, 68, 68, 0.1);
}

.board-members h3 {
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.board-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
  list-style: none;
}

.board-list li {
  padding: 0.25rem;
  color: var(--color-text-secondary);
}

/* ===================================
   Guidelines Section
   =================================== */
.guidelines-content {
  background: var(--color-bg-card);
  backdrop-filter: blur(10px);
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(239, 68, 68, 0.1);
}

.guidelines-content h3 {
  color: var(--color-primary);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.guidelines-content ul {
  margin-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.guidelines-content li {
  margin-bottom: 0.25rem;
  color: var(--color-text-secondary);
}

.alert-box {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(249, 115, 22, 0.1));
  border-left: 4px solid var(--color-primary);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  margin: var(--spacing-lg) 0;
}

.alert-box strong {
  color: var(--color-primary);
}

/* ===================================
   Previous Volumes
   =================================== */
.volumes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

.volume-card {
  background: var(--color-bg-card);
  backdrop-filter: blur(10px);
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(239, 68, 68, 0.1);
  transition: all var(--transition-base);
  text-align: center;
}

.volume-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(239, 68, 68, 0.3);
}

.volume-number {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-md);
}

/* ===================================
   Footer
   =================================== */
.footer {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.05), rgba(249, 115, 22, 0.05));
  padding: var(--spacing-2xl) var(--spacing-lg);
  text-align: center;
  border-top: 1px solid rgba(239, 68, 68, 0.1);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
}

.footer h3 {
  margin-bottom: var(--spacing-md);
}

.footer-contacts {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xl);
  flex-wrap: wrap;
  margin-bottom: var(--spacing-lg);
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.footer-note {
  color: var(--color-text-tertiary);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(239, 68, 68, 0.1);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    width: 100%;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    transition: left var(--transition-base);
  }

  .nav-menu.active {
    left: 0;
  }

  .nav-toggle {
    display: block;
  }

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

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

  .topics-grid {
    grid-template-columns: 1fr;
  }

  .editors-grid {
    grid-template-columns: 1fr;
  }

  .board-list {
    grid-template-columns: 1fr;
  }

  .volumes-grid {
    grid-template-columns: 1fr;
  }

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

  .btn {
    width: 100%;
  }
}

/* ===================================
   Utility Classes
   =================================== */
.text-center {
  text-align: center;
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

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

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}