@import url('https://fonts.googleapis.com/css2?family=Tajawal:wght@300;400;500;700;800;900&display=swap');

:root {
  /* Ultra-Clean Modern Tech Dark Theme */
  --bg-primary: #090d16;
  --bg-secondary: #0f172a;
  --bg-tertiary: #1e293b;
  --card-bg: #0f172a;
  --card-hover: #162036;
  
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: #818cf8;
  --primary-subtle: rgba(99, 102, 241, 0.12);
  
  --secondary: #0ea5e9;
  --secondary-light: #38bdf8;
  --accent: #f43f5e;
  --success: #10b981;
  --warning: #f59e0b;
  
  --text-heading: #f8fafc;
  --text-body: #94a3b8;
  --text-muted: #64748b;
  --border-color: #1e293b;
  --border-light: #334155;
  
  --font-main: 'Tajawal', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  
  --padding-page: 1.25rem;
  --gap: 1.25rem;
  
  --h1: clamp(2rem, 4.8vw, 3.4rem);
  --h2: clamp(1.6rem, 3.8vw, 2.4rem);
  --h3: clamp(1.2rem, 2.5vw, 1.5rem);
  
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --card-bg: #ffffff;
  --card-hover: #f8fafc;
  
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #6366f1;
  --primary-subtle: rgba(79, 70, 229, 0.08);
  
  --secondary: #0284c7;
  --secondary-light: #0ea5e9;
  --accent: #e11d48;
  --success: #059669;
  
  --text-heading: #0f172a;
  --text-body: #334155;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --border-light: #cbd5e1;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: var(--font-main);
  -webkit-tap-highlight-color: transparent;
}

html {
  scroll-behavior: smooth;
}

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

::selection {
  background: var(--primary);
  color: #ffffff;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-main);
  font-weight: 800;
  color: var(--text-heading);
  line-height: 1.3;
  letter-spacing: -0.015em;
}

h1 { font-size: var(--h1); }

h2 { 
  font-size: var(--h2); 
  text-align: center; 
  margin-bottom: 2.2rem; 
  position: relative; 
}

h2::after {
  content: "";
  display: block;
  width: 48px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: var(--radius-full);
  margin: 0.6rem auto 0;
}

h3 { font-size: var(--h3); font-weight: 700; }

p {
  font-size: 0.98rem;
  line-height: 1.7;
}

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

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

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 var(--padding-page);
}

/* Fluid Responsive Grid */
.grid {
  display: grid;
  gap: var(--gap);
}

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

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

/* Page Container */
.page {
  display: none;
  opacity: 0;
  padding: 2.5rem 0 4rem;
  min-height: calc(100vh - 140px);
}

.page.active {
  display: block;
  opacity: 1;
  animation: pageIn 0.25s ease-out forwards;
}

@keyframes pageIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Scroll reveal */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.35s ease, transform 0.35s ease;
}

.reveal-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Loading screen */
.loading-screen {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 99999;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.loading-logo {
  font-size: 2.6rem;
  color: var(--primary);
  animation: spinSlow 2.5s linear infinite;
}

@keyframes spinSlow {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@media (max-width: 860px) {
  .grid-cols-2, .grid-cols-3 {
    grid-template-columns: 1fr;
  }
  .page {
    padding: 1.5rem 0 3rem;
  }
}