/* ==========================================================================
   HAKAI ART AGENCY - Core Design System & Styling
   Owner: Trần Đình Tuấn
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,400;1,600&family=Montserrat:ital,wght@0,400;0,500;0,600;0,700;0,800;0,900;1,700&display=swap');

:root {
  /* Color Palette */
  --bg-dark: #07090e;
  --bg-card: rgba(18, 24, 38, 0.7);
  --bg-card-hover: rgba(26, 35, 54, 0.85);
  --bg-glass: rgba(15, 20, 32, 0.65);
  
  --accent-gold: #ffc83b;
  --accent-gold-glow: rgba(255, 200, 59, 0.35);
  --accent-crimson: #ff2a5f;
  --accent-purple: #8b5cf6;
  --accent-cyan: #06b6d4;

  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;

  --border-light: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(255, 200, 59, 0.4);

  /* Dimensions & Radius */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --font-heading: 'Montserrat', 'Be Vietnam Pro', system-ui, -apple-system, sans-serif;
  --font-body: 'Be Vietnam Pro', system-ui, -apple-system, sans-serif;

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Ambient Background Lights */
body::before {
  content: '';
  position: fixed;
  top: -150px;
  left: -150px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--accent-purple) 0%, transparent 70%);
  opacity: 0.15;
  filter: blur(100px);
  z-index: -1;
  pointer-events: none;
}

body::after {
  content: '';
  position: fixed;
  bottom: -150px;
  right: -150px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-gold) 0%, transparent 70%);
  opacity: 0.12;
  filter: blur(120px);
  z-index: -1;
  pointer-events: none;
}

/* Typography Utility */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-main);
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-fast);
}

button {
  cursor: pointer;
  border: none;
  outline: none;
  font-family: var(--font-body);
}

/* Container */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Header & Navigation */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.2rem 0;
  background: rgba(7, 9, 14, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition-fast);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-badge {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent-gold), var(--accent-crimson));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.4rem;
  color: #000;
  box-shadow: 0 0 20px var(--accent-gold-glow);
}

.brand-text h1 {
  font-size: 1.35rem;
  letter-spacing: 0.5px;
  background: linear-gradient(90deg, #ffffff 40%, var(--accent-gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-text span {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--accent-gold);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gold);
  transition: var(--transition-fast);

}

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

.btn-upload-nav {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0.65rem 1.4rem;
  border-radius: 50px;
  background: linear-gradient(135deg, var(--accent-gold), #e09f00);
  color: #07090e;
  font-weight: 700;
  font-size: 0.9rem;
  box-shadow: 0 4px 15px var(--accent-gold-glow);
  transition: var(--transition-fast);
}

.btn-upload-nav:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(255, 200, 59, 0.5);
}

/* Hero Section */
.hero {
  padding: 10rem 0 5rem 0;
  position: relative;
  text-align: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 30px;
  background: rgba(255, 200, 59, 0.1);
  border: 1px solid rgba(255, 200, 59, 0.25);
  color: var(--accent-gold);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  letter-spacing: -1px;
}

.hero-title span {
  background: linear-gradient(135deg, var(--accent-gold) 0%, #ff527b 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  max-width: 680px;
  margin: 0 auto 2.5rem auto;
  font-size: 1.15rem;
  color: var(--text-muted);
  font-weight: 400;
}

.hero-actions {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.2rem;
  flex-wrap: wrap;
}

.btn-primary {
  padding: 0.9rem 2.2rem;
  border-radius: 50px;
  background: linear-gradient(135deg, var(--accent-gold), #e09f00);
  color: #07090e;
  font-weight: 700;
  font-size: 1rem;
  box-shadow: 0 4px 20px var(--accent-gold-glow);
  transition: var(--transition-fast);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(255, 200, 59, 0.5);
}

.btn-secondary {
  padding: 0.9rem 2.2rem;
  border-radius: 50px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-light);
  color: var(--text-main);
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition-fast);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-3px);
}

/* Stats Counter Bar */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin-top: 4rem;
  padding-top: 3rem;
  border-top: 1px solid var(--border-light);
}

.stat-item h3 {
  font-size: 2.2rem;
  color: var(--accent-gold);
  margin-bottom: 4px;
}

.stat-item p {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Footer */
.footer {
  margin-top: 6rem;
  padding: 4rem 0 2rem 0;
  border-top: 1px solid var(--border-light);
  background: rgba(5, 7, 11, 0.8);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-dim);
  font-size: 0.85rem;
}

/* Responsive Styles */
@media (max-width: 992px) {
  .hero-title { font-size: 2.8rem; }
  .hero-stats { gap: 1.5rem; }
}

@media (max-width: 768px) {
  .header-content { flex-wrap: wrap; gap: 1rem; }
  .nav-links { display: none; } /* Could be hamburger menu if needed */
  .hero-title { font-size: 2.2rem; }
  .hero-subtitle { font-size: 1rem; }
  .hero-stats { flex-direction: column; gap: 1.5rem; }
}