/* ==========================================================
   StartNode — Design System & Shared Styles
   base.css: Variables, reset, typography, nav, footer,
             buttons, animations, responsive utilities
   ========================================================== */

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

:root {
  --bg-primary: #0a0a0b;
  --bg-secondary: #111113;
  --bg-card: #161618;
  --bg-card-hover: #1c1c1f;
  --border: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.12);
  --text-primary: #f0f0f0;
  --text-secondary: #8a8a8e;
  --text-muted: #5a5a5e;
  --accent: #39ff14;
  --accent-dim: rgba(57, 255, 20, 0.15);
  --accent-glow: rgba(57, 255, 20, 0.3);
  --violet: #8b5cf6;
  --violet-dim: rgba(139, 92, 246, 0.15);
  --violet-glow: rgba(139, 92, 246, 0.25);
  --gradient-accent: linear-gradient(135deg, #39ff14, #8b5cf6);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius: 12px;
  --radius-lg: 16px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 120px 0;
  position: relative;
}

/* ========== NAVIGATION ========== */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(10, 10, 11, 0.8);
  border-bottom: 1px solid transparent;
}

nav.scrolled {
  border-bottom-color: var(--border);
}

nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-icon {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  font-weight: 400;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-cta {
  font-size: 13px !important;
  font-weight: 500 !important;
  color: var(--bg-primary) !important;
  background: var(--accent);
  padding: 8px 18px;
  border-radius: 8px;
  transition: var(--transition);
}

.nav-cta:hover {
  box-shadow: 0 0 20px var(--accent-glow);
  transform: translateY(-1px);
}

/* ===== LANGUAGE SWITCHER ===== */
.lang-switcher {
  position: relative;
  display: flex;
  align-items: center;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(255,255,255,0.03);
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  font-family: var(--font);
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.lang-btn:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
  background: rgba(255,255,255,0.06);
}

.lang-btn svg {
  width: 14px;
  height: 14px;
  opacity: 0.5;
  transition: var(--transition);
}

.lang-btn:hover svg { opacity: 0.8; }

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 6px;
  min-width: 140px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: var(--transition);
  z-index: 100;
  box-shadow: 0 12px 40px rgba(0,0,0,0.5);
}

.lang-dropdown.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 7px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-secondary);
  transition: var(--transition);
  border: none;
  background: none;
  width: 100%;
  font-family: var(--font);
  text-align: left;
}

.lang-option:hover {
  background: rgba(255,255,255,0.05);
  color: var(--text-primary);
}

.lang-option.active {
  color: var(--accent);
  background: var(--accent-dim);
}

.lang-option .lang-flag {
  font-size: 16px;
  line-height: 1;
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.mobile-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ========== BUTTONS ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 500;
  font-family: var(--font);
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-primary);
  box-shadow: 0 0 30px var(--accent-dim);
}

.btn-primary:hover {
  box-shadow: 0 0 40px var(--accent-glow), 0 4px 20px rgba(0,0,0,0.3);
  transform: translateY(-2px);
}

.btn-secondary {
  background: rgba(255,255,255,0.05);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.08);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.btn-arrow {
  transition: transform 0.2s;
}

.btn:hover .btn-arrow {
  transform: translateX(3px);
}

.btn-mega {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 18px 40px;
  font-size: 17px;
  font-weight: 600;
  font-family: var(--font);
  border: none;
  border-radius: 14px;
  cursor: pointer;
  background: var(--accent);
  color: var(--bg-primary);
  box-shadow: 0 0 40px var(--accent-dim), 0 0 80px rgba(57, 255, 20, 0.08);
  transition: var(--transition);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn-mega::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: 16px;
  background: var(--gradient-accent);
  z-index: -1;
  opacity: 0;
  transition: var(--transition);
}

.btn-mega:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 0 60px var(--accent-glow), 0 8px 32px rgba(0,0,0,0.4);
}

.btn-mega:hover::before {
  opacity: 1;
}

/* ========== SECTION HEADERS ========== */
.section-label {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 700;
  letter-spacing: -1px;
  line-height: 1.15;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

.section-header {
  margin-bottom: 64px;
}

.section-header.centered {
  text-align: center;
}

.section-header.centered .section-desc {
  margin: 0 auto;
}

/* ========== UTILITY ========== */
.gradient-text {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ========== STATUS BADGES (shared) ========== */
.portfolio-badge {
  font-size: 11px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 100px;
  white-space: nowrap;
}

.badge-live {
  background: rgba(57, 255, 20, 0.1);
  color: var(--accent);
  border: 1px solid rgba(57, 255, 20, 0.2);
}

.badge-scaling {
  background: rgba(139, 92, 246, 0.1);
  color: var(--violet);
  border: 1px solid rgba(139, 92, 246, 0.2);
}

.badge-dev {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

/* ========== CTA SECTION (shared) ========== */
.cta-section {
  padding: 140px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.cta-glow {
  position: absolute;
  width: 700px;
  height: 700px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, var(--accent-dim) 0%, transparent 60%);
  filter: blur(100px);
}

.cta-content {
  position: relative;
  z-index: 1;
}

.cta-section h2 {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 800;
  letter-spacing: -1.5px;
  line-height: 1.1;
  margin-bottom: 24px;
}

.cta-section p {
  font-size: 17px;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

/* ========== FOOTER ========== */
footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-left p {
  font-size: 13px;
  color: var(--text-muted);
}

.footer-left p:first-child {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 13px;
  color: var(--text-secondary);
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--accent);
}

/* ========== ANIMATIONS ========== */
@keyframes float {
  0%, 100% { transform: translateY(0px) translateX(0px); }
  50% { transform: translateY(-30px) translateX(15px); }
}

@keyframes pulse {
  0%, 100% { opacity: 0.3; transform: scale(1); }
  50% { opacity: 0.8; transform: scale(1.5); }
}

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

/* Fade-in on scroll */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
  section { padding: 80px 0; }

  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(10, 10, 11, 0.98);
    backdrop-filter: blur(20px);
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border);
  }
  .mobile-toggle { display: flex; }

  .footer-inner { flex-direction: column; text-align: center; }
  .lang-switcher { order: -1; }
}

/* ========== CUSTOM SCROLLBAR ========== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.15); }