/* 
 * Design System for Ahmed Al Obaid - Personal Website
 * Premium Dark Mode | Glassmorphism | Modern Aesthetic
 */

:root {
  /* Colors - Dark Mode Premium */
  --bg-color: #0a0f1a;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.8);
  --bg-glass: rgba(30, 41, 59, 0.4);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border-color: rgba(148, 163, 184, 0.15);
  --border-glow: rgba(34, 211, 238, 0.3);

  /* Accent: Cyan (Modern, Tech-forward) */
  --accent-color: #22d3ee;
  --accent-hover: #06b6d4;
  --accent-glow: rgba(34, 211, 238, 0.4);
  --accent-soft: rgba(34, 211, 238, 0.1);

  /* Gradients */
  --gradient-accent: linear-gradient(135deg, #22d3ee 0%, #06b6d4 100%);
  --gradient-bg: linear-gradient(180deg, #0a0f1a 0%, #111827 50%, #0a0f1a 100%);
  --gradient-card: linear-gradient(135deg, rgba(30, 41, 59, 0.6) 0%, rgba(17, 24, 39, 0.8) 100%);

  /* Typography */
  --font-en: 'Inter', system-ui, -apple-system, sans-serif;
  --font-ar: 'IBM Plex Sans Arabic', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Spacing */
  --container-width: 1000px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-en);
  background: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* Decorative Background Grid */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    linear-gradient(rgba(34, 211, 238, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 211, 238, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

/* Decorative Glow Orbs */
body::after {
  content: '';
  position: fixed;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.15) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* Arabic Override */
:lang(ar) {
  font-family: var(--font-ar);
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.3s ease;
}

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

/* Layout */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  position: relative;
  z-index: 1;
}

/* Navigation */
.nav-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
  margin-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
}

.nav-brand {
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.nav-links {
  display: flex;
  gap: var(--spacing-md);
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.nav-link {
  position: relative;
  padding: 0.5rem 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-color);
  transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.lang-switch {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 6px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.lang-switch:hover {
  border-color: var(--accent-color);
  box-shadow: 0 0 20px var(--accent-glow);
}

/* Hero Section */
.hero {
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-lg) 0;
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  flex-direction: column-reverse;
}

@media (min-width: 768px) {
  .hero {
    flex-direction: row;
    justify-content: space-between;
  }
}

.hero-content {
  flex: 1;
}

.hero-image-container {
  flex-shrink: 0;
  position: relative;
}

/* Glowing Ring Around Photo */
.hero-image-container::before {
  content: '';
  position: absolute;
  top: -8px;
  left: -8px;
  right: -8px;
  bottom: -8px;
  border-radius: 50%;
  background: var(--gradient-accent);
  opacity: 0.6;
  animation: pulse-glow 3s ease-in-out infinite;
}

@keyframes pulse-glow {

  0%,
  100% {
    opacity: 0.4;
    transform: scale(1);
  }

  50% {
    opacity: 0.7;
    transform: scale(1.02);
  }
}

.hero-image {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--bg-color);
  position: relative;
  z-index: 1;
  box-shadow: 0 0 60px var(--accent-glow), 0 20px 40px rgba(0, 0, 0, 0.5);
  transition: transform 0.4s ease;
}

.hero-image:hover {
  transform: scale(1.05);
}

.hero-name {
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  margin-bottom: var(--spacing-xs);
  line-height: 1.1;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-color) 50%, var(--text-primary) 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-shift 5s ease infinite;
}

@keyframes gradient-shift {

  0%,
  100% {
    background-position: 0% center;
  }

  50% {
    background-position: 100% center;
  }
}

.hero-title {
  color: var(--accent-color);
  font-size: 1.25rem;
  font-weight: 500;
  margin-bottom: var(--spacing-md);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.hero-bio {
  color: var(--text-secondary);
  max-width: 55ch;
  margin-bottom: var(--spacing-md);
  font-size: 1.05rem;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid var(--border-color);
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  color: var(--text-primary);
  transition: all 0.3s ease;
  cursor: pointer;
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-accent);
  color: var(--bg-color);
  border-color: transparent;
  box-shadow: 0 8px 30px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 40px var(--accent-glow);
  color: var(--bg-color);
}

.btn-ghost {
  background: transparent;
  border-color: var(--border-color);
  color: var(--text-secondary);
}

.btn-ghost:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
  background: var(--accent-soft);
}

/* Section Styling */
.section {
  margin-bottom: var(--spacing-xl);
}

.section-title {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent-color);
  margin-bottom: var(--spacing-md);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--border-color) 0%, transparent 100%);
}

/* Glassmorphism Cards */
.card {
  background: var(--gradient-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  transition: all 0.4s ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-color), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card:hover {
  border-color: var(--border-glow);
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3), 0 0 30px var(--accent-soft);
}

.card:hover::before {
  opacity: 1;
}

/* Experience Items */
.exp-grid {
  display: grid;
  gap: var(--spacing-md);
}

.exp-item {
  background: var(--gradient-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  transition: all 0.4s ease;
}

.exp-item:hover {
  border-color: var(--border-glow);
  transform: translateY(-3px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.exp-role {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.exp-company {
  color: var(--accent-color);
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
}

.exp-date {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-feature-settings: "tnum";
  margin-bottom: var(--spacing-sm);
}

.exp-description {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Research Cards */
.research-grid {
  display: grid;
  gap: var(--spacing-md);
}

@media (min-width: 768px) {
  .research-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.research-item {
  background: var(--gradient-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  transition: all 0.4s ease;
  display: flex;
  flex-direction: column;
}

.research-item:hover {
  border-color: var(--border-glow);
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.research-meta {
  display: flex;
  gap: var(--spacing-xs);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: var(--spacing-xs);
}

.research-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
  transition: color 0.3s ease;
}

.research-item:hover .research-title {
  color: var(--accent-color);
}

.research-abstract {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  flex: 1;
}

.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--accent-color);
  font-size: 0.75rem;
  font-weight: 500;
  border: 1px solid var(--border-color);
}

/* Footer */
.site-footer {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.9rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Utilities */
.hidden {
  display: none;
}

.mt-4 {
  margin-top: 1rem;
}

.mb-4 {
  margin-bottom: 1rem;
}

/* RTL Support */
[dir="rtl"] .nav-links {
  flex-direction: row-reverse;
}

[dir="rtl"] .section-title::after {
  background: linear-gradient(270deg, var(--border-color) 0%, transparent 100%);
}

/* Contact Modal */
.contact-modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(10px);
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.contact-modal.active {
  display: flex;
  opacity: 1;
}

.modal-content {
  background: var(--gradient-card);
  backdrop-filter: blur(20px);
  margin: auto;
  padding: var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 500px;
  position: relative;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
  transform: translateY(20px);
  transition: transform 0.3s ease;
}

.contact-modal.active .modal-content {
  transform: translateY(0);
}

.close-modal {
  color: var(--text-secondary);
  float: right;
  font-size: 1.5rem;
  font-weight: bold;
  cursor: pointer;
  line-height: 1;
  transition: color 0.3s ease;
}

[dir="rtl"] .close-modal {
  float: left;
}

.close-modal:hover {
  color: var(--accent-color);
}

.field-group {
  margin-bottom: var(--spacing-sm);
}

.field-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-primary);
}

.field-group input,
.field-group textarea {
  width: 100%;
  padding: 0.85rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  transition: all 0.3s ease;
}

.field-group input:focus,
.field-group textarea:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 20px var(--accent-soft);
}

.modal-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

/* Responsive Adjustments */
@media (max-width: 768px) {
  .hero-name {
    font-size: 2.5rem;
  }

  .hero-image {
    width: 150px;
    height: 150px;
  }

  .site-footer {
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
  }

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

/* Social Icons */
.social-links {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: 1.5rem;
}

.social-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  transition: all 0.3s ease;
}

.social-icon:hover {
  background: var(--accent-soft);
  border-color: var(--accent-color);
  color: var(--accent-color);
  transform: translateY(-2px);
}

/* Skills Grid */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
}

.skill-category {
  background: var(--gradient-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  transition: all 0.3s ease;
}

.skill-category:hover {
  border-color: var(--border-glow);
  transform: translateY(-3px);
}

.skill-category h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent-color);
  margin-bottom: var(--spacing-sm);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* Form Success Message */
.form-success {
  display: none;
  text-align: center;
  padding: var(--spacing-md);
  color: var(--accent-color);
}

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

.form-success svg {
  width: 48px;
  height: 48px;
  margin-bottom: var(--spacing-sm);
}

.form-success h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

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

/* Courses Grid */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--spacing-md);
}

.course-item {
  background: var(--gradient-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  transition: all 0.3s ease;
  text-align: center;
}

.course-item:hover {
  border-color: var(--border-glow);
  transform: translateY(-3px);
}

.course-name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.course-provider {
  font-size: 0.85rem;
  color: var(--accent-color);
  margin-bottom: 0.25rem;
}

.course-year {
  font-size: 0.8rem;
  color: var(--text-secondary);
}