/* ═══════════════════════════════════════════════════
   TOPCOM — Global Design System
   ═══════════════════════════════════════════════════ */

/* ── Google Font ── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ── Design Tokens ── */
:root {
  /* Colors */
  --black: #0a0a0a;
  --white: #ffffff;
  --gray-100: #f5f5f5;
  --gray-200: #e5e5e5;
  --gray-300: #d4d4d4;
  --gray-400: #a3a3a3;
  --gray-500: #737373;
  --gray-600: #525252;
  --gray-700: #404040;
  --gray-800: #262626;
  --gray-900: #171717;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --fs-xs: clamp(0.7rem, 0.8vw, 0.8rem);
  --fs-sm: clamp(0.8rem, 1vw, 0.9rem);
  --fs-base: clamp(0.95rem, 1.1vw, 1.05rem);
  --fs-md: clamp(1.1rem, 1.4vw, 1.25rem);
  --fs-lg: clamp(1.4rem, 2vw, 1.75rem);
  --fs-xl: clamp(1.8rem, 3vw, 2.5rem);
  --fs-2xl: clamp(2.2rem, 4vw, 3.5rem);
  --fs-3xl: clamp(2.8rem, 5vw, 4.5rem);

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --duration-fast: 0.2s;
  --duration-base: 0.4s;
  --duration-slow: 0.8s;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.15);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.2);

  /* Layout */
  --max-width: 1280px;
  --header-height: 80px;
}

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

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

body {
  font-family: var(--font-family);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--black);
  background: var(--white);
  overflow-x: hidden;
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol { list-style: none; }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ═══════════════════════════════════════════════════
   HEADER
   ═══════════════════════════════════════════════════ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 1000;
  transition: background var(--duration-base) var(--ease-out),
              box-shadow var(--duration-base) var(--ease-out),
              backdrop-filter var(--duration-base) var(--ease-out);
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-logo {
  height: 40px;
  width: auto;
  transition: transform var(--duration-base) var(--ease-out);
}

.header-logo:hover {
  transform: scale(1.05);
}

/* Desktop Nav */
.nav-links {
  display: flex;
  gap: var(--space-lg);
  align-items: center;
}

.nav-links a {
  font-size: var(--fs-sm);
  font-weight: 500;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--black);
  position: relative;
  padding: var(--space-xs) 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--black);
  transition: width var(--duration-base) var(--ease-out);
}

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

/* header on hero = white text */
.site-header:not(.scrolled) .nav-links a {
  color: var(--white);
}

.site-header:not(.scrolled) .nav-links a::after {
  background: var(--white);
}

.site-header:not(.scrolled) .header-logo {
  filter: brightness(0) invert(1);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 6px;
  width: 28px;
  padding: 4px 0;
  z-index: 1100;
}

.hamburger span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--black);
  border-radius: 2px;
  transition: transform var(--duration-base) var(--ease-out),
              opacity var(--duration-fast) var(--ease-out);
}

.site-header:not(.scrolled) .hamburger span {
  background: var(--white);
}

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

/* when hamburger is active (menu open), always dark lines */
.hamburger.active span {
  background: var(--black) !important;
}

/* Mobile Nav Overlay */
.mobile-nav {
  position: fixed;
  top: 0;
  right: -100%;
  width: 100%;
  height: 100vh;
  height: 100dvh;
  background: var(--white);
  z-index: 1050;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  transition: right var(--duration-slow) var(--ease-out);
}

.mobile-nav.open {
  right: 0;
}

.mobile-nav a {
  font-size: var(--fs-xl);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--black);
  opacity: 0;
  transform: translateX(40px);
  transition: opacity var(--duration-base) var(--ease-out),
              transform var(--duration-base) var(--ease-out);
}

.mobile-nav.open a {
  opacity: 1;
  transform: translateX(0);
}

.mobile-nav.open a:nth-child(1) { transition-delay: 0.1s; }
.mobile-nav.open a:nth-child(2) { transition-delay: 0.2s; }
.mobile-nav.open a:nth-child(3) { transition-delay: 0.3s; }
.mobile-nav.open a:nth-child(4) { transition-delay: 0.4s; }

/* ═══════════════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════════════ */
.site-footer {
  background: var(--black);
  color: var(--white);
  padding: var(--space-2xl) var(--space-lg) var(--space-lg);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gray-500), transparent);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.footer-col h3 {
  font-size: var(--fs-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-md);
  color: var(--gray-300);
}

.footer-col p,
.footer-col a {
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--gray-400);
}

.footer-col a:hover {
  color: var(--white);
}

.footer-contact-block {
  margin-bottom: var(--space-md);
}

.footer-contact-block strong {
  color: var(--white);
  font-weight: 600;
  display: block;
  margin-bottom: 4px;
}

.footer-bottom {
  max-width: var(--max-width);
  margin: var(--space-xl) auto 0;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--gray-800);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer-logo {
  height: 30px;
  filter: brightness(0) invert(1);
  opacity: 0.6;
  transition: opacity var(--duration-base) var(--ease-out);
}

.footer-logo:hover {
  opacity: 1;
}

.footer-social {
  display: flex;
  gap: var(--space-sm);
}

.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--gray-700);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out),
              transform var(--duration-fast) var(--ease-out);
  color: var(--gray-400);
  font-size: var(--fs-md);
}

.footer-social a:hover {
  background: var(--white);
  border-color: var(--white);
  color: var(--black);
  transform: translateY(-3px);
}

.footer-legal {
  display: flex;
  gap: var(--space-md);
}

.footer-legal a {
  font-size: var(--fs-xs);
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-legal a:hover {
  color: var(--white);
}

/* ═══════════════════════════════════════════════════
   REUSABLE ANIMATION SYSTEM
   ═══════════════════════════════════════════════════ */

/* Scroll-triggered reveal */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

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

.reveal-left {
  opacity: 0;
  transform: translateX(-60px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(60px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-scale {
  opacity: 0;
  transform: scale(0.85);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

.reveal-scale.visible {
  opacity: 1;
  transform: scale(1);
}

/* Stagger delays */
.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }
.stagger-4 { transition-delay: 0.4s; }
.stagger-5 { transition-delay: 0.5s; }
.stagger-6 { transition-delay: 0.6s; }

/* ── Keyframes Library ── */

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

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-30px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.8); }
  to   { opacity: 1; transform: scale(1); }
}

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-60px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(60px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50%      { transform: scale(1.05); }
}

@keyframes shimmer {
  0%   { background-position: -200% center; }
  100% { background-position: 200% center; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-10px); }
}

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

@keyframes drawLine {
  from { width: 0; }
  to   { width: 100%; }
}

/* ═══════════════════════════════════════════════════
   UTILITY CLASSES
   ═══════════════════════════════════════════════════ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-2xl) 0;
}

.text-center { text-align: center; }

.section-title {
  font-size: var(--fs-2xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: var(--space-md);
}

.section-subtitle {
  font-size: var(--fs-md);
  color: var(--gray-500);
  font-weight: 400;
  max-width: 600px;
  margin: 0 auto var(--space-xl);
}

/* ═══════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════ */
@media (max-width: 968px) {
  .nav-links {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 600px) {
  :root {
    --header-height: 64px;
  }

  .header-inner {
    padding: 0 var(--space-sm);
  }

  .header-logo {
    height: 32px;
  }

  .section {
    padding: var(--space-xl) 0;
  }

  .container {
    padding: 0 var(--space-sm);
  }
}

/* ═══════════════════════════════════════════════════
   PLACEHOLDER / COMING SOON PAGES
   ═══════════════════════════════════════════════════ */
.coming-soon {
  min-height: calc(100vh - var(--header-height));
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding-top: var(--header-height);
}

.coming-soon h1 {
  font-size: var(--fs-3xl);
  font-weight: 900;
  letter-spacing: -0.03em;
  animation: fadeInUp 0.8s var(--ease-out) forwards;
}

.coming-soon p {
  font-size: var(--fs-md);
  color: var(--gray-500);
  margin-top: var(--space-sm);
  animation: fadeInUp 0.8s var(--ease-out) 0.2s both;
}