/* -------------------------------------------------------------
   Global Variables & Design Tokens
------------------------------------------------------------- */
:root {
  /* Fonts */
  --font-body-en: 'Inter', system-ui, -apple-system, sans-serif;
  --font-heading-en: 'Outfit', 'Inter', sans-serif;
  --font-ar: 'Tajawal', sans-serif;

  /* Accent Colors */
  --accent-base: #0066ff;
  --accent-hover: #0052cc;
  --accent-glow: rgba(0, 102, 255, 0.4);
  
  /* Layout */
  --nav-height: 80px;
  --section-pad: 120px;
}

[data-theme="light"] {
  --bg-body: #ffffff;
  --bg-soft: #f4f5f7;
  --bg-alternate: #fafbfc;
  --bg-glass: rgba(255, 255, 255, 0.7);
  --border-soft: rgba(0, 0, 0, 0.08);
  
  --text-main: #0f172a;
  --text-secondary: #475569;
  
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.08);
  --shadow-accent: 0 10px 25px -5px var(--accent-glow);
}

[data-theme="dark"] {
  --bg-body: #0b1120;
  --bg-soft: #141b2d;
  --bg-alternate: #0e1526;
  --bg-glass: rgba(20, 27, 45, 0.6);
  --border-soft: rgba(255, 255, 255, 0.08);
  
  --text-main: #f8fafc;
  --text-secondary: #94a3b8;
  
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
  --shadow-accent: 0 10px 25px -5px var(--accent-glow);
}

/* -------------------------------------------------------------
   Base & Reset
------------------------------------------------------------- */
html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  background-color: var(--bg-body);
  color: var(--text-main);
  font-family: var(--font-body-en);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.4s ease, color 0.4s ease;
  overflow-x: hidden;
}

body[dir="rtl"] {
  font-family: var(--font-ar);
  direction: rtl;
  text-align: right;
}

/* Typography Overrides */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading-en);
  color: var(--text-main);
  line-height: 1.2;
}

body[dir="rtl"] h1, body[dir="rtl"] h2, body[dir="rtl"] h3, 
body[dir="rtl"] h4, body[dir="rtl"] h5, body[dir="rtl"] h6 {
  font-family: var(--font-ar);
}

.text-color { color: var(--text-main) !important; }
.text-secondary-color { color: var(--text-secondary) !important; }
.text-accent { color: var(--accent-base) !important; }
.bg-soft { background-color: var(--bg-soft) !important; }
.bg-alternate { background-color: var(--bg-alternate) !important; }
.bg-glass { 
  background-color: var(--bg-glass) !important; 
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.border-soft { border-color: var(--border-soft) !important; }

/* -------------------------------------------------------------
   Utilities & Micro-Animations
------------------------------------------------------------- */
.section-pad { padding: var(--section-pad) 0; }
.transition { transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); }

.tracking-widest { letter-spacing: 0.15em; }

/* Gradients */
.text-gradient {
  background: linear-gradient(135deg, var(--accent-base) 0%, #00d2ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.bg-accent-gradient {
  background: linear-gradient(135deg, var(--bg-body) 0%, var(--accent-hover) 150%);
}

/* Buttons */
.btn-primary {
  background: var(--accent-base);
  border-color: var(--accent-base);
  font-weight: 600;
  transition: all 0.3s ease;
}
.btn-primary:hover, .btn-primary:focus {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  transform: translateY(-2px);
}

.btn-outline-dynamic {
  color: var(--text-main);
  border: 1px solid var(--border-soft);
  font-weight: 600;
  background: transparent;
  transition: all 0.3s ease;
}
.btn-outline-dynamic:hover {
  background: var(--bg-soft);
  border-color: var(--text-main);
  color: var(--text-main);
  transform: translateY(-2px);
}

.hover-lift { transition: transform 0.3s ease, box-shadow 0.3s ease; }
.hover-lift:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }

.hover-elevate { transition: transform 0.4s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.4s ease; }
.hover-elevate:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }

.hover-scale { transition: transform 0.3s ease; }
.hover-scale:hover { transform: scale(1.05); }

.hover-link:hover { color: var(--accent-hover) !important; text-decoration: underline !important; }

/* Shadows */
.shadow-accent { box-shadow: var(--shadow-accent) !important; }
.shadow-inner { box-shadow: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06); }
[data-theme="dark"] .shadow-inner { box-shadow: inset 0 2px 4px 0 rgba(0, 0, 0, 0.5); }

/* -------------------------------------------------------------
   Navbar
------------------------------------------------------------- */
.glass-nav {
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-soft);
  height: var(--nav-height);
  transition: background 0.3s ease;
}
.brand-accent { color: var(--accent-base); }
.brand-dot { color: var(--accent-base); font-size: 1.2em; font-weight: 900; }

.navbar-nav .nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 1rem;
  transition: color 0.3s ease;
}
.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
  color: var(--text-main);
}
.navbar-nav .nav-link.active::after {
  content: '';
  display: block;
  width: 20px;
  height: 2px;
  background: var(--accent-base);
  margin: 4px auto 0;
  border-radius: 2px;
}

.lang-btn {
  color: var(--text-secondary);
  font-weight: 600;
  border-radius: 50px;
  padding: 0.2rem 0.8rem;
  transition: all 0.3s;
}
.lang-btn.active {
  background: var(--bg-body);
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
}
.btn-icon {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-main);
  transition: all 0.3s;
}
.btn-icon:hover {
  background: var(--border-soft) !important;
  color: var(--accent-base);
}

/* -------------------------------------------------------------
   Hero Section
------------------------------------------------------------- */
.hero-section {
  min-height: calc(100vh - var(--nav-height));
  position: relative;
  overflow: hidden;
}

/* Abstract Background Glows */
.hero-bg-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  z-index: 0;
  opacity: 0.4;
  animation: float-glow 10s infinite alternate ease-in-out;
}
.glow-1 {
  width: 40vw;
  height: 40vw;
  background: var(--accent-base);
  top: -10vw;
  right: -10vw;
}
.glow-2 {
  width: 30vw;
  height: 30vw;
  background: #00d2ff;
  bottom: -5vw;
  left: -5vw;
  animation-delay: -5s;
}
[data-theme="light"] .hero-bg-glow { opacity: 0.15; }

@keyframes float-glow {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(-30px, 30px) scale(1.1); }
}

/* Status Badge Pulse */
.status-badge { border: 1px solid var(--border-soft); }
.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #10b981;
  display: inline-block;
}
.status-dot.pulsing {
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse-green 2s infinite;
}
@keyframes pulse-green {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* Typing Effect Cursor */
.typing-container { white-space: nowrap; overflow: hidden; display: inline-block; }
.cursor {
  display: inline-block;
  width: 3px;
  background-color: var(--accent-base);
  animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* Profile Photo & Ring */
.profile-wrapper {
  width: 320px;
  height: 320px;
  position: relative;
  z-index: 2;
}
.profile-ring {
  position: absolute;
  top: -10px; left: -10px; right: -10px; bottom: -10px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-base), transparent);
  z-index: -1;
  animation: rotate-ring 8s linear infinite;
  opacity: 0.5;
}
@keyframes rotate-ring { 100% { transform: rotate(360deg); } }

.profile-photo {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--bg-body);
  filter: grayscale(20%) contrast(1.1);
  transition: filter 0.5s ease;
}
.profile-photo:hover { filter: grayscale(0%) contrast(1); }

/* Floating Badges */
.floating-badge {
  position: absolute;
  width: 50px; height: 50px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-lg);
  z-index: 3;
  animation: float 4s ease-in-out infinite;
}
.badge-1 { top: 10%; left: 0; animation-delay: 0s; }
.badge-2 { bottom: 15%; right: 5%; animation-delay: 1.5s; font-size: 1.2rem; }
.badge-3 { top: 40%; right: -5%; animation-delay: 2.5s; }

@keyframes float {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-15px); }
  100% { transform: translateY(0px); }
}

/* Scroll Mouse Icon */
.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  opacity: 0.6;
}
.mouse {
  width: 26px; height: 42px;
  border: 2px solid var(--text-secondary);
  border-radius: 14px;
  position: relative;
}
.wheel {
  width: 4px; height: 6px;
  background: var(--text-secondary);
  border-radius: 2px;
  position: absolute;
  top: 6px; left: 50%;
  transform: translateX(-50%);
  animation: scroll-wheel 1.5s infinite;
}
@keyframes scroll-wheel {
  0% { top: 6px; opacity: 1; }
  100% { top: 18px; opacity: 0; }
}

/* -------------------------------------------------------------
   About Section
------------------------------------------------------------- */
.border-accent-left { border-left: 4px solid var(--accent-base) !important; }
.icon-box {
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
}
.aspect-ratio-box {
  aspect-ratio: 4/5;
  border: 1px solid var(--border-soft);
}
.lead-text { font-size: 1.15rem; line-height: 1.8; }

/* -------------------------------------------------------------
   Skills
------------------------------------------------------------- */
.bg-pattern {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background-image: radial-gradient(var(--text-secondary) 1px, transparent 1px);
  background-size: 30px 30px;
  z-index: 0;
}
.skill-category-card {
  border: 1px solid var(--border-soft);
  position: relative;
  z-index: 1;
}
.border-hover-accent:hover {
  border-color: var(--accent-base) !important;
  box-shadow: 0 10px 30px -10px var(--accent-glow);
  transform: translateY(-5px);
}
.skill-tag {
  background: var(--bg-body);
  color: var(--text-main);
  border: 1px solid var(--border-soft);
  font-weight: 500;
  padding: 0.5rem 0.8rem;
  border-radius: 6px;
  font-size: 0.85rem;
  transition: all 0.2s ease;
}
.skill-category-card:hover .skill-tag:hover {
  background: var(--accent-base);
  color: #fff;
  border-color: var(--accent-base);
}

/* -------------------------------------------------------------
   Projects
------------------------------------------------------------- */
.project-case-card {
  border: 1px solid var(--border-soft);
  overflow: hidden;
}
.mockup-window {
  border: 1px solid var(--border-soft);
  display: flex;
  flex-direction: column;
  aspect-ratio: 16/10;
}
.mockup-header { background: var(--bg-soft); }

/* -------------------------------------------------------------
   Experience & Education Timeline
------------------------------------------------------------- */
.timeline-modern {
  position: relative;
  padding-left: 2rem;
}
body[dir="rtl"] .timeline-modern {
  padding-left: 0;
  padding-right: 2rem;
}
.timeline-modern::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 2px;
  background: var(--border-soft);
}
body[dir="rtl"] .timeline-modern::before {
  left: auto; right: 0;
}

.timeline-modern-item {
  position: relative;
  padding-bottom: 3rem;
}
.timeline-modern-marker {
  position: absolute;
  left: -2rem; top: 0;
  width: 40px; height: 40px;
  border-radius: 50%;
  transform: translateX(-50%);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  z-index: 1;
}
body[dir="rtl"] .timeline-modern-marker {
  left: auto; right: -2rem;
  transform: translateX(50%);
}

.hover-bg-soft:hover { background-color: var(--bg-soft) !important; }

/* -------------------------------------------------------------
   Contact
------------------------------------------------------------- */
.contact-info-bar a:hover { color: rgba(255,255,255,0.8) !important; }
.contact-bg-pattern {
  position: absolute; top:0; left:0; width:100%; height:100%;
  background-image: 
    linear-gradient(45deg, rgba(255,255,255,0.03) 25%, transparent 25%, transparent 75%, rgba(255,255,255,0.03) 75%, rgba(255,255,255,0.03)), 
    linear-gradient(45deg, rgba(255,255,255,0.03) 25%, transparent 25%, transparent 75%, rgba(255,255,255,0.03) 75%, rgba(255,255,255,0.03));
  background-size: 60px 60px;
  background-position: 0 0, 30px 30px;
  opacity: 0.5;
  z-index: 0;
}

/* -------------------------------------------------------------
   Footer & To Top
------------------------------------------------------------- */
.to-top {
  position: fixed;
  right: 2rem; bottom: 2rem;
  width: 50px; height: 50px;
  display: flex; align-items: center; justify-content: center;
  border: none;
  font-size: 1.2rem;
  z-index: 999;
  opacity: 0; visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
body[dir="rtl"] .to-top { right: auto; left: 2rem; }

/* -------------------------------------------------------------
   Animations (Intersection Observer Reveal)
------------------------------------------------------------- */
[data-reveal] {
  opacity: 0;
  transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
  will-change: opacity, transform;
}
[data-reveal="fade-up"] { transform: translateY(40px); }
[data-reveal="fade-down"] { transform: translateY(-40px); }
[data-reveal="fade-left"] { transform: translateX(40px); }
[data-reveal="fade-right"] { transform: translateX(-40px); }

[data-reveal].revealed {
  opacity: 1;
  transform: translate(0, 0);
}

/* -------------------------------------------------------------
   Preloader
------------------------------------------------------------- */
.preloader {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--bg-body);
  z-index: 9999;
  display: flex;
  align-items: center; justify-content: center;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

/* -------------------------------------------------------------
   Responsive Queries
------------------------------------------------------------- */
@media (max-width: 991px) {
  :root { --section-pad: 80px; }
  .profile-wrapper { width: 260px; height: 260px; margin-top: 2rem; }
  .hero-section { min-height: auto; padding: 4rem 0; text-align: center; }
  .floating-badge { width: 40px; height: 40px; font-size: 1.2rem; }
  .timeline-modern-content { margin-top: 1rem; }
  
  .navbar-collapse {
    background: var(--bg-glass);
    padding: 1rem;
    border-radius: 12px;
    margin-top: 1rem;
    border: 1px solid var(--border-soft);
  }
}

@media (max-width: 576px) {
  :root { --section-pad: 60px; }
  .display-3 { font-size: 2.5rem !important; }
  .h1 { font-size: 2rem !important; }
  .mockup-window { aspect-ratio: inherit; min-height: 250px; }
  .project-img-container { padding: 2rem !important; }
  
  .timeline-modern { padding-left: 1rem; }
  .timeline-modern-marker {
    left: -1rem;
    width: 30px; height: 30px;
    font-size: 0.9rem;
  }
  
  body[dir="rtl"] .timeline-modern { padding-right: 1rem; padding-left: 0; }
  body[dir="rtl"] .timeline-modern-marker {
    left: auto;
    right: -1rem;
  }
}

/* -------------------------------------------------------------
   PRO Upgrade Additions (v2)
------------------------------------------------------------- */

/* Stats strip */
.stat-number {
  font-family: var(--font-heading-en);
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  line-height: 1.1;
}
body[dir="rtl"] .stat-number { font-family: var(--font-ar); }

/* Metric pills (featured project) */
.metric-pill {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.3rem 0.8rem;
  border-radius: 50px;
  color: var(--accent-base);
  background: rgba(0, 102, 255, 0.12);
  border: 1px solid rgba(0, 102, 255, 0.25);
}

/* Secondary project mini-cards */
.project-mini-card {
  border: 1px solid var(--border-soft);
}
.project-mini-card:hover { border-color: var(--accent-base); }
.project-mini-icon {
  width: 52px;
  height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: var(--bg-soft);
}

/* Research cards */
.research-card {
  border: 1px solid var(--border-soft);
}
.research-card:hover { border-color: var(--accent-base); }
.research-card i {
  width: 48px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: var(--bg-soft);
}

/* RTL fix: flip arrow icons & timeline borders */
body[dir="rtl"] .fa-arrow-right { transform: scaleX(-1); }
body[dir="rtl"] .border-accent-left { border-left: 0 !important; }


/* -------------------------------------------------------------
   Mobile Responsiveness (v3 - final)
------------------------------------------------------------- */
@media (max-width: 991.98px) {
  .display-3 { font-size: 2.4rem; }
  .hero-section { min-height: auto; padding-top: 2.5rem; padding-bottom: 2.5rem; }
  .typing-container { white-space: normal; }
  .profile-wrapper { width: 240px; height: 240px; }
}

@media (max-width: 575.98px) {
  .display-3 { font-size: 2rem; }
  .display-5 { font-size: 1.7rem; }
  .section-title.h1 { font-size: 1.8rem; }
  .profile-wrapper { width: 200px; height: 200px; }
  .floating-badge { transform: scale(0.85); }
  .hero-subtitle, .lead { font-size: 1rem; }
  .project-img-container { padding: 1.5rem !important; }
  .mockup-window { min-height: 220px; }
  .contact-info-bar { gap: 1rem !important; }
  .btn-lg { padding: 0.6rem 1.4rem; font-size: 0.95rem; }
  .skill-icon-header { font-size: 1.5rem; }
}

@media (max-width: 767.98px) {
  .hero-bg-glow { filter: blur(60px); opacity: 0.25; }
  body { overflow-x: hidden; }
}