/* =============================================
   SHARED.CSS - نظام تصميم عصري واحترافي ممتاز (Premium Design System)
   ============================================= */

/* Google Font: Space Grotesk for Headings, Inter for Body */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');

/* CSS Variables: Harmony Palette */
:root {
  --primary-bg: #090a0f;
  --secondary-bg: #0f111a;
  --accent: #b9db6b;            /* Neon Lime */
  --accent-glow: rgba(185, 219, 107, 0.15);
  --accent-dark: #9ac142;
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --card-bg: rgba(15, 17, 26, 0.7);
  --card-border: rgba(255, 255, 255, 0.08);
  --header-bg: rgba(9, 10, 15, 0.75);
  --font-heading: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --radius: 20px;
}

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

html {
  overflow-x: hidden;
  width: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--primary-bg);
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(185, 219, 107, 0.05) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(185, 219, 107, 0.04) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(15, 17, 26, 0.5) 0%, var(--primary-bg) 100%);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  line-height: 1.6;
  position: relative;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--primary-bg);
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* ===== HEADER ===== */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 4vw;
  background: var(--header-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--card-border);
  transition: var(--transition);
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.5px;
  position: relative;
  background: linear-gradient(to right, #fff, var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ===== NAV ===== */
nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  justify-content: center;
  flex: 1;
}

nav a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.2px;
  position: relative;
  transition: var(--transition);
  padding: 0.5rem 0.25rem;
}

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

nav a:hover {
  color: #fff;
}

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

nav a.active {
  color: var(--accent);
  font-weight: 600;
}

/* ===== HAMBURGER BUTTON ===== */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0.5rem;
  z-index: 1100;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

.hamburger.open span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}
.hamburger.open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.hamburger.open span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* ===== MOBILE NAV OVERLAY ===== */
.mobile-nav-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(9, 10, 15, 0.98);
  backdrop-filter: blur(25px);
  -webkit-backdrop-filter: blur(25px);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2.2rem;
  opacity: 0;
  transition: opacity 0.4s ease;
}

.mobile-nav-overlay.open {
  display: flex;
  opacity: 1;
}

.mobile-nav-overlay a {
  text-decoration: none;
  color: var(--text-secondary);
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 600;
  transition: var(--transition);
}

.mobile-nav-overlay a:hover,
.mobile-nav-overlay a.active {
  color: var(--accent);
  transform: translateY(-2px);
}

/* ===== FOOTER ===== */
footer {
  text-align: center;
  padding: 2rem 1.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--card-border);
  background: var(--secondary-bg);
  margin-top: auto;
}

/* ===== BUTTON (Glassmorphism & Glow) ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 2.2rem;
  background: var(--accent);
  color: #090a0f;
  border-radius: 30px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid var(--accent);
  transition: var(--transition);
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(185, 219, 107, 0.15);
}

.btn:hover {
  background: transparent;
  color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 10px 25px rgba(185, 219, 107, 0.3);
}

.btn-secondary {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: none;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: #fff;
  color: #fff;
}

/* ===== LANGUAGE SWITCHER ===== */
.language-switcher {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #fff;
  padding: 0.4rem 0.8rem;
  border-radius: 10px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.language-switcher:hover {
  border-color: var(--accent);
  background: rgba(185, 219, 107, 0.05);
}

.language-switcher option {
  background: var(--secondary-bg);
  color: #fff;
}

/* ===== CARDS (Premium Glassmorphism) ===== */
.premium-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 2.5rem;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: var(--transition);
}

.premium-card:hover {
  border-color: rgba(185, 219, 107, 0.3);
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4), 0 0 40px var(--accent-glow);
}

/* ===== BACKGROUND VIDEO & OVERLAY ===== */
#bg-video {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  object-fit: cover;
  z-index: -2;
}

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: radial-gradient(circle at center, rgba(9, 10, 15, 0.5) 0%, rgba(9, 10, 15, 0.88) 100%);
  z-index: -1;
}

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

/* ===== MOBILE RESPONSIVE ===== */
@media (max-width: 768px) {
  header {
    display: grid;
    grid-template-areas: 
      "logo lang"
      "nav nav";
    grid-template-columns: 1fr auto;
    gap: 0.25rem 0.5rem;
    padding: 0.4rem 0.75rem;
  }
  
  .logo {
    grid-area: logo;
    font-size: 1.1rem;
    align-self: center;
  }
  
  .language-switcher {
    grid-area: lang;
    align-self: center;
    padding: 0.2rem 0.4rem;
    font-size: 0.75rem;
  }
  
  header nav {
    grid-area: nav;
    display: flex !important;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    width: 100%;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding: 0.25rem 0 0 0;
    gap: 0.2rem 1%;
  }

  header nav a {
    font-size: 0.7rem;
    padding: 0.15rem 0;
    white-space: nowrap;
    text-align: center;
    box-sizing: border-box;
    flex-shrink: 0;
  }

  /* Specific width percentages to force 4-3 wrap and space elements out nicely without overlap */
  header nav a:nth-child(1) { width: 18%; } /* Home */
  header nav a:nth-child(2) { width: 18%; } /* About */
  header nav a:nth-child(3) { width: 26%; } /* Portfolio */
  header nav a:nth-child(4) { width: 34%; } /* Certification */

  header nav a:nth-child(5) { width: 28%; } /* Resume */
  header nav a:nth-child(6) { width: 34%; } /* LinkedIn */
  header nav a:nth-child(7) { width: 30%; } /* Contact */

  .hamburger {
    display: none !important;
  }
}

/* Decrease card padding on small screens to fit content without overflow */
@media (max-width: 480px) {
  .premium-card {
    padding: 1.25rem !important;
  }
}