body {
  font-family: 'Vazir', Tahoma, Arial, sans-serif;
}

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

:root {
  /* Modern Color Palette */
  --primary-color: #3a7bd5;
  --primary-dark: #2c5aa0;
  --primary-light: #6ea8fe;
  --secondary-color: #f8f9fa;
  --accent-color: #00c9a7;
  --accent-hover: #00b090;
  --text-color: #2d3748;
  --text-light: #718096;
  --bg-color: #ffffff;
  --card-bg: #ffffff;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-hover: 0 20px 30px -10px rgba(0, 0, 0, 0.15);
  --gradient-primary: linear-gradient(135deg, #3a7bd5 0%, #00d2ff 100%);
  --gradient-accent: linear-gradient(135deg, #00c9a7 0%, #3a7bd5 100%);
  --gradient-dark: linear-gradient(135deg, #2c5aa0 0%, #1e3a8a 100%);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-2xl: 2rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition: 0.3s ease;
  --transition-slow: 0.5s ease;
}

[data-theme="dark"] {
  --primary-color: #60a5fa;
  --primary-dark: #3b82f6;
  --primary-light: #93c5fd;
  --secondary-color: #1a202c;
  --accent-color: #10b981;
  --accent-hover: #059669;
  --text-color: #f7fafc;
  --text-light: #cbd5e0;
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --border-color: #334155;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
  --shadow-hover: 0 20px 30px -10px rgba(0, 0, 0, 0.4);
  --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #38bdf8 100%);
  --gradient-accent: linear-gradient(135deg, #10b981 0%, #3b82f6 100%);
  --gradient-dark: linear-gradient(135deg, #1e40af 0%, #1e3a8a 100%);
}

body {
  font-family: "Vazir", Tahoma, Arial, sans-serif;
  line-height: 1.7;
  color: var(--text-color);
  background-color: var(--bg-color);
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-4);
  width: 100%;
}

/* Loading Screen */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  transition: opacity 0.8s ease, visibility 0.8s ease;
}

.loading-screen.hidden {
  opacity: 0;
  visibility: hidden;
}

.loading-content {
  text-align: center;
  color: white;
  transform: translateY(0);
  transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.loading-screen.hidden .loading-content {
  transform: translateY(-20px);
}

.loading-logo {
  font-size: 4rem;
  margin-bottom: var(--space-6);
  animation: pulse 2s infinite;
  position: relative;
}

.loading-logo::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 120px;
  height: 120px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  z-index: -1;
  animation: ripple 2s infinite;
}

.loading-text h2 {
  font-size: 2.5rem;
  margin-bottom: var(--space-2);
  font-weight: 700;
}

.loading-text p {
  font-size: 1.2rem;
  opacity: 0.9;
  margin-bottom: var(--space-8);
  font-weight: 300;
}

.loading-spinner {
  display: flex;
  justify-content: center;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-top: 4px solid white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.1);
    opacity: 0.8;
  }
}

@keyframes ripple {
  0% {
    width: 120px;
    height: 120px;
    opacity: 0.8;
  }
  100% {
    width: 200px;
    height: 200px;
    opacity: 0;
  }
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Header */
.header {
  background: var(--card-bg);
  box-shadow: var(--shadow);
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  transition: all var(--transition);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.header.scrolled {
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-md);
}

[data-theme="dark"] .header.scrolled {
  background: rgba(30, 41, 59, 0.9);
}

.navbar {
  padding: var(--space-4) 0;
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-4);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  display: flex;
  align-items: center;
}

.nav-logo h2 {
  color: var(--primary-color);
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0;
  transition: color var(--transition);
}

.nav-logo-icon {
  margin-left: var(--space-2);
  color: var(--accent-color);
  font-size: 1.8rem;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--space-8);
  margin: 0;
}

.nav-menu a {
  text-decoration: none;
  color: var(--text-color);
  font-weight: 500;
  transition: color var(--transition);
  position: relative;
  padding: var(--space-2) 0;
}

.nav-menu a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-color);
  transition: width var(--transition);
}

.nav-menu a:hover {
  color: var(--primary-color);
}

.nav-menu a:hover::after {
  width: 100%;
}

.theme-toggle {
  display: flex;
  align-items: center;
}

.theme-btn {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: var(--space-2);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
}

.theme-btn:hover {
  transform: scale(1.1);
  background: var(--primary-dark);
}

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  z-index: 1001;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background: var(--text-color);
  margin: 3px 0;
  transition: var(--transition);
  border-radius: var(--radius-full);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Hero Section */
.hero {
  padding: 160px 0 100px;
  background: var(--gradient-primary);
  color: white;
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('data:image/svg+xml;charset=utf8,%3Csvg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"%3E%3Cpath fill="%23ffffff" fill-opacity="0.05" d="M0,224L48,213.3C96,203,192,181,288,181.3C384,181,480,203,576,202.7C672,203,768,181,864,181.3C960,181,1056,203,1152,197.3C1248,192,1344,160,1392,144L1440,128L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"%3E%3C/path%3E%3C/svg%3E');
  background-size: cover;
  background-position: center;
  opacity: 0.6;
  z-index: 1;
}

.hero-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-4);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero-content {
  animation: fadeInUp 1s ease;
}

.hero-content h1 {
  font-size: 3.5rem;
  margin-bottom: var(--space-6);
  line-height: 1.2;
  font-weight: 700;
}

.hero-content p {
  font-size: 1.25rem;
  margin-bottom: var(--space-8);
  opacity: 0.9;
  font-weight: 300;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: var(--space-4);
}

.btn {
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-full);
  text-decoration: none;
  font-weight: 600;
  transition: all var(--transition);
  display: inline-block;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  text-align: center;
  box-shadow: var(--shadow);
  font-family: "Vazir", Tahoma, Arial, sans-serif;
}

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

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  background: var(--secondary-color);
}

.btn-secondary {
  background: transparent;
  color: white;
  border: 2px solid white;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

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

.btn-accent:hover {
  background: var(--accent-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.hero-image {
  position: relative;
  animation: fadeInRight 1s ease;
}

.hero-image img {
  width: 100%;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition);
}

.hero-image:hover img {
  transform: translateY(-5px);
}

.hero-image::before {
  content: "";
  position: absolute;
  top: -20px;
  right: -20px;
  width: 100%;
  height: 100%;
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-xl);
  z-index: -1;
}

.hero-image::after {
  content: "";
  position: absolute;
  bottom: -20px;
  left: -20px;
  width: 60%;
  height: 60%;
  background: var(--accent-color);
  border-radius: var(--radius-lg);
  z-index: -1;
  opacity: 0.5;
}

/* Section Styles */
.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
  position: relative;
}

.section-header h2 {
  font-size: 2.5rem;
  margin-bottom: var(--space-4);
  color: var(--primary-color);
  font-weight: 700;
  position: relative;
  display: inline-block;
}

.section-header h2::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: var(--accent-color);
  border-radius: var(--radius-full);
}

.section-header p {
  font-size: 1.2rem;
  color: var(--text-light);
  max-width: 600px;
  margin: var(--space-6) auto 0;
}

/* About Section */
.about {
  padding: var(--space-24) 0;
  background: var(--secondary-color);
  position: relative;
  overflow: hidden;
}

.about::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('data:image/svg+xml;charset=utf8,%3Csvg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"%3E%3Cpath fill="%233a7bd5" fill-opacity="0.03" d="M0,160L48,170.7C96,181,192,203,288,202.7C384,203,480,181,576,154.7C672,128,768,96,864,106.7C960,117,1056,171,1152,197.3C1248,224,1344,224,1392,224L1440,224L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"%3E%3C/path%3E%3C/svg%3E');
  background-size: cover;
  background-position: center;
  opacity: 0.5;
  z-index: 1;
}

.about-main {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-16);
  align-items: start;
  margin-bottom: var(--space-12);
  position: relative;
  z-index: 2;
}

.about-text h3 {
  font-size: 2.2rem;
  margin-bottom: var(--space-6);
  color: var(--primary-color);
  font-weight: 700;
}

.about-intro {
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: var(--space-8);
  color: var(--text-light);
}

.about-details h4 {
  font-size: 1.5rem;
  color: var(--primary-color);
  margin: var(--space-8) 0 var(--space-4) 0;
  font-weight: 600;
}

.education-list {
  list-style: none;
  margin-bottom: var(--space-8);
}

.education-list li {
  display: flex;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  padding: var(--space-6);
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: all var(--transition);
}

.education-list li:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.education-list i {
  color: var(--accent-color);
  font-size: 1.8rem;
  margin-top: var(--space-1);
  flex-shrink: 0;
}

.education-list strong {
  color: var(--primary-color);
  display: block;
  margin-bottom: var(--space-1);
  font-size: 1.1rem;
}

.education-list span {
  color: var(--text-light);
  font-size: 0.9rem;
  display: block;
  margin-bottom: var(--space-2);
}

.education-list p {
  color: var(--text-light);
  font-size: 0.95rem;
  line-height: 1.6;
}

.specialties {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
}

.specialty-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--card-bg);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: all var(--transition);
  border-left: 3px solid var(--accent-color);
}

.specialty-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.specialty-item i {
  color: var(--accent-color);
  font-size: 1.2rem;
}

.about-image {
  position: relative;
}

.about-image img {
  width: 100%;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition);
}

.about-image:hover img {
  transform: translateY(-5px);
}

.experience-badge {
  position: absolute;
  bottom: 30px;
  right: -20px;
  background: var(--gradient-accent);
  color: white;
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-lg);
  animation: pulse 3s infinite;
}

.experience-number {
  display: block;
  font-size: 2.5rem;
  font-weight: bold;
  line-height: 1;
}

.experience-text {
  font-size: 1rem;
  font-weight: 300;
}

.credentials {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-4);
  position: relative;
  z-index: 2;
}

.credential {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  background: var(--card-bg);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: all var(--transition);
}

.credential:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.credential i {
  color: var(--primary-color);
  font-size: 1.8rem;
  background: rgba(58, 123, 213, 0.1);
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
}

/* Research Section */
.research {
  padding: var(--space-24) 0;
  position: relative;
  overflow: hidden;
}

.research::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('data:image/svg+xml;charset=utf8,%3Csvg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"%3E%3Cpath fill="%2300c9a7" fill-opacity="0.03" d="M0,96L48,112C96,128,192,160,288,186.7C384,213,480,235,576,224C672,213,768,171,864,165.3C960,160,1056,192,1152,197.3C1248,203,1344,181,1392,170.7L1440,160L1440,0L1392,0C1344,0,1248,0,1152,0C1056,0,960,0,864,0C768,0,672,0,576,0C480,0,384,0,288,0C192,0,96,0,48,0L0,0Z"%3E%3C/path%3E%3C/svg%3E');
  background-size: cover;
  background-position: center;
  opacity: 0.5;
  z-index: 1;
}

.research-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-16);
  position: relative;
  z-index: 2;
}

.research-stat {
  text-align: center;
  background: var(--card-bg);
  padding: var(--space-8);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.research-stat::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: var(--gradient-primary);
}

.research-stat:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
}

.research-stat h3 {
  font-size: 3.5rem;
  color: var(--primary-color);
  margin-bottom: var(--space-2);
  font-weight: 700;
}

.research-stat p {
  color: var(--text-light);
  font-weight: 500;
  font-size: 1.1rem;
}

.research-areas h3,
.publications h3 {
  font-size: 2rem;
  color: var(--primary-color);
  margin-bottom: var(--space-8);
  text-align: center;
  font-weight: 700;
  position: relative;
  display: inline-block;
  left: 50%;
  transform: translateX(-50%);
}

.research-areas h3::after,
.publications h3::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: var(--accent-color);
  border-radius: var(--radius-full);
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-16);
  position: relative;
  z-index: 2;
}

.research-card {
  background: var(--card-bg);
  padding: var(--space-8);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.research-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--gradient-primary);
}

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

.research-icon {
  width: 70px;
  height: 70px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-6);
  position: relative;
}

.research-icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 85px;
  height: 85px;
  border: 2px dashed rgba(58, 123, 213, 0.3);
  border-radius: var(--radius-full);
}

.research-icon i {
  font-size: 1.8rem;
  color: white;
}

.research-card h4 {
  font-size: 1.4rem;
  color: var(--primary-color);
  margin-bottom: var(--space-4);
  font-weight: 600;
}

.research-card p {
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: var(--space-4);
  font-size: 1rem;
}

.research-meta {
  display: flex;
  gap: var(--space-4);
  font-size: 0.9rem;
  color: var(--text-light);
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-color);
}

.research-meta i {
  margin-left: var(--space-1);
  color: var(--accent-color);
}

.publication-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  position: relative;
  z-index: 2;
}

.publication-item {
  background: var(--card-bg);
  padding: var(--space-8);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.publication-item::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 50px 50px 0;
  border-color: transparent var(--accent-color) transparent transparent;
  opacity: 0.7;
}

.publication-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.publication-info h4 {
  color: var(--primary-color);
  margin-bottom: var(--space-2);
  line-height: 1.5;
  font-size: 1.3rem;
  font-weight: 600;
}

.publication-info p {
  color: var(--text-light);
  margin-bottom: var(--space-4);
  font-size: 1rem;
}

.publication-metrics {
  display: flex;
  gap: var(--space-8);
  font-size: 0.95rem;
  color: var(--text-light);
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-color);
}

.publication-metrics i {
  margin-left: var(--space-1);
  color: var(--accent-color);
}

/* Articles Section */
.articles {
  padding: var(--space-24) 0;
  background: var(--secondary-color);
  position: relative;
  overflow: hidden;
}

.articles::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('data:image/svg+xml;charset=utf8,%3Csvg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"%3E%3Cpath fill="%233a7bd5" fill-opacity="0.03" d="M0,288L48,272C96,256,192,224,288,197.3C384,171,480,149,576,165.3C672,181,768,235,864,250.7C960,267,1056,245,1152,224C1248,203,1344,181,1392,170.7L1440,160L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"%3E%3C/path%3E%3C/svg%3E');
  background-size: cover;
  background-position: center;
  opacity: 0.5;
  z-index: 1;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-8);
  position: relative;
  z-index: 2;
}

.article-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all var(--transition);
  height: 100%;
  display: flex;
  flex-direction: column;
}

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

.article-image {
  position: relative;
  overflow: hidden;
}

.article-image img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  transition: transform 0.8s ease;
}

.article-card:hover .article-image img {
  transform: scale(1.05);
}

.article-content {
  padding: var(--space-6);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.article-content h3 {
  font-size: 1.4rem;
  margin-bottom: var(--space-4);
  color: var(--primary-color);
  line-height: 1.5;
  font-weight: 600;
}

.article-content p {
  color: var(--text-light);
  margin-bottom: var(--space-4);
  line-height: 1.7;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  gap: var(--space-4);
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: var(--space-4);
}

.article-meta i {
  margin-left: var(--space-2);
  color: var(--accent-color);
}

.read-more-btn {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-full);
  cursor: pointer;
  font-weight: 500;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: fit-content;
  box-shadow: var(--shadow);
}

.read-more-btn:hover {
  background: var(--accent-color);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

/* Article Modal */
.article-modal {
  display: none;
  position: fixed;
  z-index: 10000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.8);
  animation: fadeIn 0.4s ease;
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
}

.article-modal-content {
  background-color: var(--card-bg);
  margin: 2% auto;
  border-radius: var(--radius-xl);
  width: 90%;
  max-width: 800px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: slideIn 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.article-modal-header {
  padding: var(--space-4) var(--space-8);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  position: sticky;
  top: 0;
  background: var(--card-bg);
  z-index: 1;
}

.article-modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-light);
  transition: all var(--transition);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
}

.article-modal-close:hover {
  color: var(--primary-color);
  background: var(--secondary-color);
  transform: rotate(90deg);
}

.article-modal-body {
  padding: var(--space-8);
  line-height: 1.8;
}

.article-modal-body h2 {
  color: var(--primary-color);
  margin-bottom: var(--space-6);
  font-size: 2.2rem;
  font-weight: 700;
  position: relative;
  padding-bottom: var(--space-4);
}

.article-modal-body h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100px;
  height: 4px;
  background: var(--accent-color);
  border-radius: var(--radius-full);
}

.article-modal-body h3 {
  color: var(--primary-color);
  margin: var(--space-8) 0 var(--space-4) 0;
  font-size: 1.8rem;
  font-weight: 600;
}

.article-modal-body h4 {
  color: var(--primary-color);
  margin: var(--space-6) 0 var(--space-3) 0;
  font-size: 1.4rem;
  font-weight: 600;
}

.article-modal-body h5 {
  color: var(--primary-color);
  margin: var(--space-4) 0 var(--space-2) 0;
  font-size: 1.2rem;
  font-weight: 600;
}

.article-modal-body p {
  margin-bottom: var(--space-6);
  color: var(--text-color);
  font-size: 1.05rem;
}

.article-modal-body ul,
.article-modal-body ol {
  margin-bottom: var(--space-6);
  padding-right: var(--space-8);
}

.article-modal-body li {
  margin-bottom: var(--space-2);
  color: var(--text-color);
}

.article-modal-body .highlight {
  background: var(--accent-color);
  color: white;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  display: inline-block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-70px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Services Section */
.services {
  padding: var(--space-24) 0;
  position: relative;
  overflow: hidden;
}

.services::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('data:image/svg+xml;charset=utf8,%3Csvg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"%3E%3Cpath fill="%2300c9a7" fill-opacity="0.03" d="M0,160L48,170.7C96,181,192,203,288,213.3C384,224,480,224,576,213.3C672,203,768,181,864,186.7C960,192,1056,224,1152,229.3C1248,235,1344,213,1392,202.7L1440,192L1440,0L1392,0C1344,0,1248,0,1152,0C1056,0,960,0,864,0C768,0,672,0,576,0C480,0,384,0,288,0C192,0,96,0,48,0L0,0Z"%3E%3C/path%3E%3C/svg%3E');
  background-size: cover;
  background-position: center;
  opacity: 0.5;
  z-index: 1;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-8);
  position: relative;
  z-index: 2;
}

.service-card {
  background: var(--card-bg);
  padding: var(--space-8);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.service-card::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: var(--gradient-primary);
  z-index: -1;
}

.service-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-primary);
  z-index: -1;
  opacity: 0;
  transition: opacity var(--transition);
}

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

.service-card:hover::after {
  opacity: 0.05;
}

.service-icon {
  width: 100px;
  height: 100px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-6);
  position: relative;
}

.service-icon::before {
  content: "";
  position: absolute;
  top: -8px;
  left: -8px;
  right: -8px;
  bottom: -8px;
  border: 2px dashed rgba(58, 123, 213, 0.3);
  border-radius: var(--radius-full);
  animation: spin 20s linear infinite;
}

.service-icon i {
  font-size: 2.5rem;
  color: white;
}

.service-card h3 {
  font-size: 1.5rem;
  margin-bottom: var(--space-4);
  color: var(--primary-color);
  font-weight: 600;
}

.service-card p {
  color: var(--text-light);
  line-height: 1.7;
  font-size: 1.05rem;
}

/* Contact Section */
.contact {
  padding: var(--space-24) 0;
  background: var(--secondary-color);
  position: relative;
  overflow: hidden;
}

.contact::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('data:image/svg+xml;charset=utf8,%3Csvg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"%3E%3Cpath fill="%233a7bd5" fill-opacity="0.03" d="M0,96L48,122.7C96,149,192,203,288,224C384,245,480,235,576,202.7C672,171,768,117,864,117.3C960,117,1056,171,1152,197.3C1248,224,1344,224,1392,224L1440,224L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"%3E%3C/path%3E%3C/svg%3E');
  background-size: cover;
  background-position: center;
  opacity: 0.5;
  z-index: 1;
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: start;
  position: relative;
  z-index: 2;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  background: var(--card-bg);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: all var(--transition);
}

.contact-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.contact-item i {
  width: 60px;
  height: 60px;
  background: var(--gradient-primary);
  color: white;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.contact-item h4 {
  font-size: 1.2rem;
  margin-bottom: var(--space-2);
  color: var(--primary-color);
  font-weight: 600;
}

.contact-item p {
  color: var(--text-light);
  line-height: 1.7;
  font-size: 1.05rem;
}

.contact-form {
  background: var(--card-bg);
  padding: var(--space-8);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  position: relative;
}

.contact-form::before {
  content: "";
  position: absolute;
  top: -10px;
  right: -10px;
  width: 100%;
  height: 100%;
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  z-index: -1;
}

.form-group {
  margin-bottom: var(--space-6);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: var(--space-4) var(--space-5);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  background: var(--bg-color);
  color: var(--text-color);
  transition: all var(--transition);
  font-family: "Vazir", Tahoma, Arial, sans-serif;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(58, 123, 213, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 150px;
}

/* Footer */
.footer {
  background: var(--card-bg);
  padding: var(--space-12) 0 var(--space-4);
  border-top: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('data:image/svg+xml;charset=utf8,%3Csvg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"%3E%3Cpath fill="%233a7bd5" fill-opacity="0.02" d="M0,160L48,138.7C96,117,192,75,288,69.3C384,64,480,96,576,128C672,160,768,192,864,176C960,160,1056,96,1152,74.7C1248,53,1344,75,1392,85.3L1440,96L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"%3E%3C/path%3E%3C/svg%3E');
  background-size: cover;
  background-position: center;
  opacity: 0.5;
  z-index: 1;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-8);
  position: relative;
  z-index: 2;
}

.footer-section h3 {
  color: var(--primary-color);
  margin-bottom: var(--space-4);
  font-size: 1.5rem;
  font-weight: 600;
  position: relative;
  display: inline-block;
}

.footer-section h3::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 40px;
  height: 3px;
  background: var(--accent-color);
  border-radius: var(--radius-full);
}

.footer-section h4 {
  color: var(--primary-color);
  margin-bottom: var(--space-4);
  font-size: 1.2rem;
  font-weight: 600;
  position: relative;
  display: inline-block;
}

.footer-section h4::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--accent-color);
  border-radius: var(--radius-full);
}

.footer-section p {
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}

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

.footer-section ul li {
  margin-bottom: var(--space-2);
}

.footer-section ul li a {
  color: var(--text-light);
  text-decoration: none;
  transition: color var(--transition);
  display: flex;
  align-items: center;
}

.footer-section ul li a::before {
  content: "\f105";
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  margin-left: var(--space-2);
  color: var(--accent-color);
  transition: transform var(--transition);
}

.footer-section ul li a:hover {
  color: var(--primary-color);
}

.footer-section ul li a:hover::before {
  transform: translateX(-3px);
}

.footer-section i {
  margin-left: var(--space-2);
  color: var(--accent-color);
  width: 20px;
  text-align: center;
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-8);
  border-top: 1px solid var(--border-color);
  color: var(--text-light);
  position: relative;
  z-index: 2;
}

/* Success Message */
.success-message {
  background: var(--accent-color);
  color: white;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4);
  display: none;
  animation: slideIn 0.5s ease;
}

.success-message.show {
  display: block;
}

/* Scroll to Top Button */
.scroll-to-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: var(--radius-full);
  width: 50px;
  height: 50px;
  cursor: pointer;
  display: none;
  z-index: 1000;
  transition: all var(--transition);
  box-shadow: var(--shadow);
  font-size: 1.2rem;
}

.scroll-to-top:hover {
  background: var(--accent-color);
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Responsive Design */
@media (max-width: 1024px) {
  .hero-content h1 {
    font-size: 3rem;
  }

  .section-header h2 {
    font-size: 2.2rem;
  }

  .about-main {
    gap: var(--space-8);
  }

  .research-stat h3 {
    font-size: 3rem;
  }
}

@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    left: -100%;
    top: 70px;
    flex-direction: column;
    background-color: var(--card-bg);
    width: 100%;
    text-align: center;
    transition: 0.3s;
    box-shadow: var(--shadow);
    padding: var(--space-8) 0;
    z-index: 1000;
  }

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

  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-8);
  }

  .hero-content h1 {
    font-size: 2.5rem;
  }

  .hero-buttons {
    justify-content: center;
    flex-wrap: wrap;
  }

  .about-main {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .contact-content {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

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

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

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

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

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

  .services-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }

  .article-modal-content {
    width: 95%;
    margin: 5% auto;
  }

  .article-modal-body {
    padding: var(--space-6);
  }

  .hero-image::before,
  .hero-image::after {
    display: none;
  }

  .experience-badge {
    right: 10px;
    bottom: 10px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-4);
  }

  .hero {
    padding: 120px 0 80px;
  }

  .hero-content h1 {
    font-size: 2rem;
  }

  .section-header h2 {
    font-size: 1.8rem;
  }

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

  .contact-form {
    padding: var(--space-6);
  }

  .article-modal-body {
    padding: var(--space-4);
  }

  .article-modal-body h2 {
    font-size: 1.8rem;
  }

  .research-stat h3 {
    font-size: 2.5rem;
  }

  .btn {
    padding: var(--space-3) var(--space-6);
    font-size: 0.9rem;
  }
}

/* Form Validation */
.form-group input:invalid,
.form-group select:invalid,
.form-group textarea:invalid {
  border-color: #ef4444;
}

.form-group input:valid,
.form-group select:valid,
.form-group textarea:valid {
  border-color: var(--accent-color);
}

/* Loading Animation */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #fff;
  animation: spin 1s ease-in-out infinite;
}

/* Smooth Scrolling */
html {
  scroll-behavior: smooth;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--secondary-color);
}

::-webkit-scrollbar-thumb {
  background: var(--primary-color);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-dark);
}

/* Selection */
::selection {
  background: var(--primary-color);
  color: white;
}

::-moz-selection {
  background: var(--primary-color);
  color: white;
}

/* Focus Styles */
*:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Print Styles */
@media print {
  .header,
  .loading-screen,
  .scroll-to-top,
  .theme-toggle {
    display: none !important;
  }

  body {
    background: white !important;
    color: black !important;
  }

  .hero {
    background: white !important;
    color: black !important;
  }
}