/* ==================== ROOT VARIABLES (Single Change Updates All Colors) ==================== */
:root {
  /* Core Colors - Golden Metal Theme */
  --gold-primary: #D4AF37;
  --gold-dark: #B8960C;
  --gold-light: #FFD700;
  --gold-gradient: linear-gradient(135deg, #D4AF37 0%, #FFD700 45%, #B8860B 100%);
  --gold-gradient-soft: linear-gradient(120deg, rgba(212, 175, 55, 0.12) 0%, rgba(255, 215, 0, 0.06) 100%);
  
  /* Base Colors */
  --black-deep: #050505;
  --black-rich: #0A0A0A;
  --black-mid: #111111;
  --white-pure: #FFFFFF;
  --white-soft: #F8F8F8;
  --gray-border: #2A2A2A;
  --gray-muted: #E5E5E5;
  
  /* Typography */
  --font-heading: 'Oswald', sans-serif;
  --font-body: 'Space Grotesk', sans-serif;
  
  /* Effects */
  --transition-smooth: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --transition-bounce: all 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  --shadow-gold: 0 10px 40px rgba(212, 175, 55, 0.25);
  --shadow-glow: 0 0 30px rgba(212, 175, 55, 0.35);
  --glass-border: 1px solid rgba(212, 175, 55, 0.2);
}

/* ==================== GLOBAL RESET & BASE ==================== */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--font-body);
  background: var(--black-rich);
  color: var(--white-pure);
  overflow-x: hidden;
  line-height: 1.65;
  font-weight: 400;
  scroll-behavior: smooth;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: -0.01em;
  text-transform: uppercase;
}

/* ==================== TYPOGRAPHY UTILITIES ==================== */
.gold-text { color: var(--gold-primary); }
.gold-gradient-text {
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
}

.section-title-pro {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 700;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--white-pure) 0%, var(--gold-light) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.section-light-pro .section-title-pro {
  background: linear-gradient(135deg, var(--black-rich) 0%, var(--gold-dark) 100%);
  -webkit-background-clip: text;
  background-clip: text;
}

.subheading-pro {
  font-size: 1rem;
  color: var(--gold-primary);
  text-transform: uppercase;
  letter-spacing: 4px;
  font-weight: 500;
  margin-top: -0.25rem;
  margin-bottom: 1.75rem;
  position: relative;
  display: inline-block;
}

.subheading-pro::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 50px;
  height: 2px;
  background: var(--gold-gradient);
}

.text-center .subheading-pro::after { left: 50%; transform: translateX(-50%); }

.section-badge {
  display: inline-block;
  padding: 0.4rem 1rem;
  background: var(--gold-gradient);
  color: var(--black-rich);
  font-weight: 600;
  border-radius: 50px;
  font-size: 0.75rem;
  letter-spacing: 1.5px;
  margin-bottom: 1.25rem;
  text-transform: uppercase;
}

/* ==================== BUTTONS ==================== */
.btn-golden-pro {
  background: var(--gold-gradient);
  color: var(--black-deep);
  border: none;
  font-weight: 700;
  transition: var(--transition-smooth);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: var(--shadow-gold);
  font-family: var(--font-heading);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.btn-golden-pro:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 40px rgba(212, 175, 55, 0.4);
  color: var(--black-deep);
}

.btn-golden-outline {
  background: transparent;
  border: 2px solid var(--gold-primary);
  color: var(--gold-primary);
  padding: 10px 28px;
  border-radius: 50px;
  font-weight: 600;
  transition: var(--transition-smooth);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.btn-golden-outline:hover {
  background: var(--gold-primary);
  color: var(--black-deep);
  transform: translateY(-2px);
}

.btn-outline-premium {
  border: 2px solid rgba(255, 255, 255, 0.25);
  background: transparent;
  color: var(--white-pure);
  padding: 10px 28px;
  border-radius: 50px;
  font-weight: 600;
  transition: var(--transition-smooth);
  text-decoration: none;
  font-family: var(--font-heading);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.btn-outline-premium:hover { border-color: var(--gold-primary); color: var(--gold-primary); transform: translateY(-2px); }

/* ==================== HEADER & NAVIGATION ==================== */
.site-header { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; }

.glass-nav-professional {
  background: rgba(5, 5, 5, 0.75);
  backdrop-filter: blur(16px);
  border-radius: 60px;
  margin: 20px 30px;
  width: auto;
  border: var(--glass-border);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.logo-brand { height: 35px; width: auto;  }

.hamburger-premium { border: none; background: transparent; padding: 8px; }
.hamburger-premium .line {
  display: block; width: 26px; height: 2px; background: var(--gold-primary);
  margin: 5px 0; transition: var(--transition-smooth);
}
.hamburger-premium[aria-expanded="true"] .line:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger-premium[aria-expanded="true"] .line:nth-child(2) { opacity: 0; }
.hamburger-premium[aria-expanded="true"] .line:nth-child(3) { transform: rotate(-45deg) translate(7px, -6px); }

.navbar-nav .nav-link { color: var(--white-pure); font-weight: 500; transition: var(--transition-smooth); font-family: var(--font-heading); text-transform: uppercase; font-size: 0.9rem; letter-spacing: 0.5px; }
.navbar-nav .nav-link:hover { color: var(--gold-primary); }

.glass-dropdown { background: rgba(10, 10, 10, 0.95); backdrop-filter: blur(12px); border: var(--glass-border); border-radius: 16px; }
.dropdown-item { color: var(--white-pure); transition: var(--transition-smooth); font-family: var(--font-body); }
.dropdown-item:hover { background: var(--gold-gradient); color: var(--black-deep); }

/* ==================== HERO SECTION ==================== */
.hero-professional { min-height: 100vh; position: relative; background: linear-gradient(135deg, #050505 0%, #111 100%); padding-top: 120px; }
.parallax-hero { background-attachment: fixed; background-position: center; background-size: cover; position: relative; isolation: isolate; }

.hero-badge { color: var(--gold-primary); letter-spacing: 4px; font-size: 0.8rem; text-transform: uppercase; font-weight: 600; }
.hero-main-title { font-size: clamp(2.8rem, 7vw, 5.5rem); line-height: 1.1; font-weight: 800; margin: 1rem 0; }
.hero-lead { font-size: 1.1rem; opacity: 0.9; max-width: 90%; }

.floating-img { animation: floatHero 6s ease-in-out infinite; }
@keyframes floatHero { 0%, 100% { transform: translateY(0px); } 50% { transform: translateY(-20px); } }

/* ==================== SECTION STYLES (Dark/Light Alternate) ==================== */
.section-dark-pro { background: var(--black-rich); color: var(--white-pure); padding: 100px 0; position: relative; }
.section-light-pro { background: var(--white-soft); color: var(--black-rich); padding: 100px 0; }

.parallax-bg-pro {
  background-attachment: fixed;
  background-position: center;
  background-size: cover;
}

/* Glass & Card Styles */
.glass-stat-badge {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(16px);
  border: var(--glass-border);
  border-radius: 32px;
  padding: 40px;
  text-align: center;
}

.feature-card-glass {
  background: rgba(0, 0, 0, 0.03);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(212, 175, 55, 0.15);
  border-radius: 24px;
  padding: 32px 20px;
  transition: var(--transition-smooth);
}
.feature-card-glass:hover { transform: translateY(-8px); border-color: var(--gold-primary); box-shadow: var(--shadow-glow); }

/* Timeline */
.timeline-pro { margin-top: 1.5rem; }
.timeline-item-pro { padding: 16px 0; border-bottom: 1px solid rgba(212, 175, 55, 0.15); font-size: 0.95rem; }
.year-gold { color: var(--gold-primary); font-weight: 700; display: inline-block; width: 85px; font-family: var(--font-heading); }

/* Problem/Solution Cards */
.problem-card-pro, .solution-card-pro { padding: 20px; border-radius: 20px; background: rgba(212, 175, 55, 0.05); border-left: 4px solid var(--gold-primary); text-align: center; }
.solution-card-pro { border-left-color: #00E5A0; border-left: 4px solid #00E5A0; }

/* Engine List */
.engine-list-pro { list-style: none; padding: 0; }
.engine-list-pro li { padding: 14px 0; font-size: 1rem; display: flex; align-items: flex-start; gap: 14px; }
.engine-list-pro li i { color: var(--gold-primary); font-size: 1.3rem; margin-top: 3px; }

/* Stats Cards */
.stat-card-pro {
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.08), transparent);
  padding: 35px 20px;
  border-radius: 28px;
  border: 1px solid rgba(212, 175, 55, 0.2);
  transition: var(--transition-smooth);
}
.stat-card-pro:hover { transform: scale(1.02); border-color: var(--gold-primary); }
.stat-number-pro { font-size: 3rem; font-weight: 800; color: var(--gold-primary); font-family: var(--font-heading); }

/* Progress */
.progress-roadmap { background: rgba(255,255,255,0.1); border-radius: 30px; overflow: hidden; }
.progress-fill { background: var(--gold-gradient); padding: 10px 20px; color: var(--black-deep); font-weight: bold; border-radius: 30px; width: 72%; }

/* Glass Code Preview */
.glass-code-preview { background: rgba(0,0,0,0.4); backdrop-filter: blur(12px); border-radius: 20px; padding: 20px; font-family: monospace; border: var(--glass-border); }

/* Research Badges */
.research-badge { padding: 8px 24px; background: rgba(212, 175, 55, 0.1); border-radius: 60px; border: 1px solid rgba(212, 175, 55, 0.3); font-weight: 500; }

/* CTA */
.cta-professional { padding: 100px 0; background: linear-gradient(135deg, #0A0A0A, #1A1A1A); }
.cta-glass-wrapper { background: rgba(255,255,255,0.03); backdrop-filter: blur(20px); border: var(--glass-border); }

/* FAQ Accordion */
.faq-accordion-pro .accordion-item { background: transparent; border-bottom: 1px solid rgba(212, 175, 55, 0.2); margin-bottom: 0; border-left: none; border-right: none; }
.faq-accordion-pro .accordion-button { background: transparent; font-weight: 700; padding: 20px; font-family: var(--font-heading); text-transform: uppercase; }
.section-light-pro .faq-accordion-pro .accordion-button { color: var(--black-rich); }
.faq-accordion-pro .accordion-button:not(.collapsed) { background: var(--gold-gradient-soft); color: var(--gold-dark); box-shadow: none; }

/* Contact Form */
.glass-form-pro { background: rgba(0, 0, 0, 0.2); backdrop-filter: blur(10px); border: var(--glass-border); }
.glass-form-pro .form-control { background: rgba(255, 255, 255, 0.05); border: 1px solid rgba(212, 175, 55, 0.25); color: var(--white-pure); padding: 12px 16px; }
.section-dark-pro .glass-form-pro .form-control:focus { background: rgba(255, 255, 255, 0.1); border-color: var(--gold-primary); box-shadow: 0 0 12px rgba(212, 175, 55, 0.3); }
.social-icons-pro i { transition: var(--transition-smooth); cursor: pointer; }
.social-icons-pro i:hover { color: var(--gold-primary); transform: translateY(-3px); }

/* Footer */
.footer-pro { background: #080808; padding: 60px 0 20px; border-top: 1px solid rgba(212, 175, 55, 0.2); }
.footer-pro h5 { color: var(--gold-primary); margin-bottom: 20px; font-size: 1.1rem; }
.footer-pro ul { list-style: none; padding: 0; }
.footer-pro ul li { margin-bottom: 10px; }
.footer-pro ul li a { color: #aaa; text-decoration: none; transition: var(--transition-smooth); }
.footer-pro ul li a:hover { color: var(--gold-primary); padding-left: 5px; }
.border-gold { border-color: rgba(212, 175, 55, 0.2) !important; }

/* Responsive */
@media (max-width: 991px) {
  .navbar-collapse { background: rgba(0,0,0,0.95); backdrop-filter: blur(20px); border-radius: 24px; padding: 20px; margin-top: 15px; }
  .glass-nav-professional { margin: 15px; }
  .hero-lead { max-width: 100%; }
  .section-dark-pro, .section-light-pro { padding: 60px 0; }
  .parallax-bg-pro, .parallax-hero { background-attachment: scroll; }
}

@media (max-width: 768px) {
  .stat-number-pro { font-size: 2rem; }
  .timeline-item-pro { font-size: 0.85rem; }
  .year-gold { width: 70px; font-size: 0.8rem; }
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: #1a1a1a; }
::-webkit-scrollbar-thumb { background: var(--gold-primary); border-radius: 10px; }

/* Animation on scroll enhancement */
[data-aos] { pointer-events: auto; }