/* ===== Theme Variables ===== */
:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f3f4f6;
  --bg-card: #ffffff;
  --bg-card-hover-shadow: rgba(59, 130, 246, 0.08);
  --bg-card-hover-shadow2: rgba(139, 92, 246, 0.04);
  --card-border: rgba(0, 0, 0, 0.08);
  --card-border-hover: rgba(59, 130, 246, 0.35);
  --text-primary: #111827;
  --text-secondary: #4b5563;
  --text-muted: #6b7280;
  --text-faint: #9ca3af;
  --navbar-bg: rgba(255, 255, 255, 0.9);
  --navbar-border: rgba(0, 0, 0, 0.06);
  --mobile-menu-bg: rgba(255, 255, 255, 0.95);
  --input-bg: rgba(0, 0, 0, 0.03);
  --input-border: rgba(0, 0, 0, 0.1);
  --input-placeholder: #9ca3af;
  --dot-pattern: rgba(0, 0, 0, 0.04);
  --hero-glow1: rgba(59, 130, 246, 0.08);
  --hero-glow2: rgba(139, 92, 246, 0.06);
  --hero-glow3: rgba(59, 130, 246, 0.04);
  --blur-accent1: rgba(59, 130, 246, 0.06);
  --blur-accent2: rgba(139, 92, 246, 0.06);
  --border-subtle: rgba(0, 0, 0, 0.06);
  --icon-bg: rgba(59, 130, 246, 0.08);
  --icon-bg-hover: rgba(59, 130, 246, 0.14);
  --icon-bg-purple: rgba(139, 92, 246, 0.08);
  --icon-bg-purple-hover: rgba(139, 92, 246, 0.14);
  --social-bg: rgba(0, 0, 0, 0.04);
  --social-bg-hover: rgba(0, 0, 0, 0.08);
  --outline-btn-border: rgba(0, 0, 0, 0.15);
  --outline-btn-border-hover: rgba(0, 0, 0, 0.3);
  --outline-btn-text: #374151;
  --connector-line: rgba(59, 130, 246, 0.2);
}

.dark {
  --bg-primary: #0f0f13;
  --bg-secondary: #08080b;
  --bg-card: #111827;
  --bg-card-hover-shadow: rgba(59, 130, 246, 0.1);
  --bg-card-hover-shadow2: rgba(139, 92, 246, 0.05);
  --card-border: rgba(59, 130, 246, 0.15);
  --card-border-hover: rgba(59, 130, 246, 0.4);
  --text-primary: #ededed;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --text-faint: #4b5563;
  --navbar-bg: rgba(15, 15, 19, 0.9);
  --navbar-border: rgba(255, 255, 255, 0.05);
  --mobile-menu-bg: rgba(15, 15, 19, 0.95);
  --input-bg: rgba(255, 255, 255, 0.05);
  --input-border: rgba(255, 255, 255, 0.1);
  --input-placeholder: #4b5563;
  --dot-pattern: rgba(255, 255, 255, 0.05);
  --hero-glow1: rgba(59, 130, 246, 0.15);
  --hero-glow2: rgba(139, 92, 246, 0.1);
  --hero-glow3: rgba(59, 130, 246, 0.08);
  --blur-accent1: rgba(59, 130, 246, 0.1);
  --blur-accent2: rgba(139, 92, 246, 0.1);
  --border-subtle: rgba(255, 255, 255, 0.05);
  --icon-bg: rgba(59, 130, 246, 0.1);
  --icon-bg-hover: rgba(59, 130, 246, 0.2);
  --icon-bg-purple: rgba(139, 92, 246, 0.1);
  --icon-bg-purple-hover: rgba(139, 92, 246, 0.2);
  --social-bg: rgba(255, 255, 255, 0.05);
  --social-bg-hover: rgba(255, 255, 255, 0.1);
  --outline-btn-border: rgba(255, 255, 255, 0.1);
  --outline-btn-border-hover: rgba(255, 255, 255, 0.25);
  --outline-btn-text: #d1d5db;
  --connector-line: rgba(59, 130, 246, 0.3);
}

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

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Gradient text */
.gradient-text {
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Card glow effect */
.card-glow {
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  transition: all 0.3s ease;
}

.card-glow:hover {
  border-color: var(--card-border-hover);
  box-shadow: 0 0 30px var(--bg-card-hover-shadow), 0 0 60px var(--bg-card-hover-shadow2);
}

/* Hero gradient background */
.hero-gradient {
  background: radial-gradient(ellipse at 50% 0%, var(--hero-glow1) 0%, transparent 50%),
              radial-gradient(ellipse at 80% 50%, var(--hero-glow2) 0%, transparent 50%),
              radial-gradient(ellipse at 20% 80%, var(--hero-glow3) 0%, transparent 50%);
}

/* Dot pattern */
.dot-pattern {
  background-image: radial-gradient(var(--dot-pattern) 1px, transparent 1px);
  background-size: 30px 30px;
}

/* Gradient button */
.btn-gradient {
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  transition: all 0.3s ease;
}

.btn-gradient:hover {
  background: linear-gradient(135deg, #2563eb, #7c3aed);
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.4);
}

/* Navbar transition */
.navbar-scrolled {
  background: var(--navbar-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--navbar-border);
}

/* Form input */
.form-input {
  background: var(--input-bg);
  border-color: var(--input-border);
  color: var(--text-primary);
}

.form-input::placeholder {
  color: var(--input-placeholder);
}

.form-input:focus {
  outline: none;
  border-color: rgba(59, 130, 246, 0.5);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.15);
}

/* Theme toggle */
.theme-toggle {
  background: var(--social-bg);
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  background: var(--social-bg-hover);
}

/* Section alt background */
.section-alt {
  background: var(--bg-secondary);
}

/* Spin animation for loader */
@keyframes spin {
  to { transform: rotate(360deg); }
}
.animate-spin {
  animation: spin 1s linear infinite;
}