/* ============================================================
   DIGITAL DNA — GLOBAL STYLES (DARK MODE)
   ============================================================ */

/* ============================================
   RESET & BASE
   ============================================ */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: var(--text-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Grain noise overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23noise)' opacity='0.035'/%3E%3C/svg%3E");
  background-size: 200px 200px;
  opacity: 1;
}

/* Ensure content is above noise */
body > * {
  position: relative;
  z-index: 1;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

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

input, textarea, select {
  font-family: var(--font-body);
}

/* ============================================
   SCROLL PROGRESS BAR
   ============================================ */

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: calc(var(--scroll-progress) * 100%);
  background: var(--accent-gradient);
  z-index: 9999;
  pointer-events: none;
  transition: width 0.05s linear;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  color: var(--text-primary);
  letter-spacing: -0.025em;
}

h1 { font-size: clamp(2.5rem, 6vw, var(--text-6xl)); font-weight: 800; letter-spacing: -0.035em; }
h2 { font-size: clamp(1.875rem, 4vw, var(--text-5xl)); font-weight: 700; }
h3 { font-size: clamp(1.25rem, 2.5vw, var(--text-3xl)); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }

p {
  line-height: 1.75;
  color: var(--text-secondary);
}

.text-primary   { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted     { color: var(--text-muted); }
.text-accent    { color: var(--accent-teal); }
.text-purple    { color: var(--accent-purple); }

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

/* ============================================
   LAYOUT
   ============================================ */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section {
  padding: var(--space-24) 0;
}

.section--sm {
  padding: var(--space-16) 0;
}

.section--lg {
  padding: var(--space-32) 0;
}

/* ============================================
   NAVIGATION
   ============================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-4) 0;
  background: rgba(8, 8, 15, 0.75);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition-base), border-color var(--transition-base);
}

.nav.scrolled {
  background: rgba(8, 8, 15, 0.92);
  border-bottom-color: rgba(255, 255, 255, 0.10);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.nav__logo {
  display: flex;
  flex-direction: column;
  line-height: 1;
  text-decoration: none;
}

.nav__logo-text {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-xl);
  color: var(--text-primary);
  letter-spacing: -0.03em;
}

.nav__logo-text span {
  background: var(--accent-gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav__logo-sub {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 0.10em;
  text-transform: uppercase;
  margin-top: 2px;
}

.nav__logo-img {
  height: 42px;
  width: auto;
  display: block;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  letter-spacing: 0.01em;
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent-gradient);
  transition: width var(--transition-base);
}

.nav__link:hover,
.nav__link.active {
  color: var(--text-primary);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

.nav__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--accent-teal);
  color: var(--text-inverse);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-full);
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  letter-spacing: 0.01em;
}

.nav__cta:hover {
  background: var(--accent-teal-dark);
  transform: translateY(-1px);
  box-shadow: var(--glow-teal);
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  cursor: pointer;
  padding: var(--space-1);
  z-index: 101;
}

.nav__hamburger span {
  display: block;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.nav__hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav__hamburger.open span:nth-child(2) {
  opacity: 0;
}
.nav__hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile nav */
.nav__mobile {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-base);
  z-index: 99;
  padding: var(--space-24) var(--space-6) var(--space-12);
  flex-direction: column;
  gap: var(--space-4);
}

.nav__mobile.open {
  display: flex;
}

.nav__mobile-link {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  border-bottom: 1px solid var(--border);
  padding-bottom: var(--space-5);
  transition: color var(--transition-fast);
}

.nav__mobile-link:hover {
  color: var(--accent-teal);
}

.nav__mobile-cta {
  margin-top: var(--space-4);
  display: inline-flex;
  align-self: flex-start;
  align-items: center;
  gap: var(--space-2);
  background: var(--accent-teal);
  color: var(--text-inverse);
  font-size: var(--text-lg);
  font-weight: 600;
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-full);
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--text-base);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  cursor: pointer;
  letter-spacing: 0.01em;
  text-decoration: none;
  border: 1px solid transparent;
  will-change: transform;
}

.btn--primary {
  background: var(--accent-teal);
  color: var(--text-inverse);
  border-color: var(--accent-teal);
}

.btn--primary:hover {
  background: var(--accent-teal-dark);
  border-color: var(--accent-teal-dark);
  transform: translateY(-2px);
  box-shadow: var(--glow-teal);
}

.btn--outline {
  background: var(--glass-bg);
  color: var(--text-primary);
  border-color: var(--glass-border);
  backdrop-filter: blur(8px);
}

.btn--outline:hover {
  border-color: var(--accent-teal);
  color: var(--accent-teal);
  background: var(--accent-teal-dim);
  transform: translateY(-2px);
}

.btn--purple {
  background: var(--accent-purple);
  color: #fff;
  border-color: var(--accent-purple);
}

.btn--purple:hover {
  background: var(--accent-purple-dark);
  border-color: var(--accent-purple-dark);
  transform: translateY(-2px);
  box-shadow: var(--glow-purple);
}

.btn--lg {
  font-size: var(--text-lg);
  padding: var(--space-4) var(--space-8);
}

.btn--sm {
  font-size: var(--text-sm);
  padding: var(--space-2) var(--space-4);
}

/* ============================================
   TAGS / BADGES
   ============================================ */

.tag {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
}

.tag--teal {
  background: var(--accent-teal-dim);
  color: var(--accent-teal);
  border: 1px solid rgba(20, 184, 188, 0.20);
}

.tag--purple {
  background: var(--accent-purple-dim);
  color: var(--accent-purple-light);
  border: 1px solid rgba(139, 92, 246, 0.20);
}

.tag--amber {
  background: var(--accent-purple-dim);
  color: var(--accent-purple-light);
  border: 1px solid rgba(139, 92, 246, 0.20);
}

.tag--neutral {
  background: var(--glass-bg);
  color: var(--text-secondary);
  border: 1px solid var(--glass-border);
}

/* ============================================
   SECTION HEADINGS
   ============================================ */

.section-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--accent-teal);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.section-label::before {
  content: '';
  display: block;
  width: 20px;
  height: 1px;
  background: var(--accent-teal);
  opacity: 0.7;
}

.section-heading {
  font-size: clamp(1.875rem, 4vw, var(--text-5xl));
  margin-bottom: var(--space-4);
  font-weight: 700;
  letter-spacing: -0.025em;
}

.section-subheading {
  font-size: var(--text-xl);
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.6;
}

/* ============================================
   CARDS (BASE)
   ============================================ */

.card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base), background var(--transition-base);
}

.card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
  background: var(--glass-bg-hover);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  background: var(--bg-surface-1);
  border-top: 1px solid var(--border);
  padding: var(--space-16) 0 var(--space-8);
}

.footer__inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.footer__brand-name {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.footer__brand-name span {
  background: var(--accent-gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.footer__brand-logo {
  height: 52px;
  width: auto;
  display: block;
  margin-bottom: var(--space-4);
}

.footer__brand-tagline {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: var(--space-6);
}

.footer__social {
  display: flex;
  gap: var(--space-3);
}

.footer__social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.footer__social-link:hover {
  background: var(--accent-teal-dim);
  border-color: var(--border-teal);
  color: var(--accent-teal);
}

.footer__col-title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.10em;
  margin-bottom: var(--space-5);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__link {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--text-primary);
}

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-8);
  border-top: 1px solid var(--border);
}

.footer__copyright {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.footer__portfolio-link {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  transition: color var(--transition-fast);
}

.footer__portfolio-link:hover {
  color: var(--accent-teal);
}

/* ============================================
   PAGE HERO (inner pages)
   ============================================ */

.page-hero {
  padding: calc(72px + var(--space-16)) 0 var(--space-16);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: -20%;
  right: -20%;
  bottom: 0;
  background:
    radial-gradient(ellipse 60% 60% at 15% 50%, rgba(20, 184, 188, 0.07) 0%, transparent 60%),
    radial-gradient(ellipse 50% 50% at 85% 50%, rgba(139, 92, 246, 0.06) 0%, transparent 60%);
  pointer-events: none;
}

.page-hero__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--accent-teal);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.page-hero__label::before {
  content: '';
  display: block;
  width: 16px;
  height: 1px;
  background: var(--accent-teal);
}

.page-hero__heading {
  font-size: clamp(2.25rem, 5vw, var(--text-6xl));
  margin-bottom: var(--space-5);
  font-weight: 800;
  letter-spacing: -0.035em;
}

.page-hero__sub {
  font-size: var(--text-xl);
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.65;
}

/* ============================================
   INLINE LINK
   ============================================ */

.link {
  color: var(--accent-teal);
  font-weight: 500;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 3px;
  transition: text-decoration-color var(--transition-fast);
}

.link:hover {
  text-decoration-color: var(--accent-teal);
}

.link--arrow::after {
  content: ' →';
}

/* ============================================
   DIVIDER
   ============================================ */

.divider {
  width: 48px;
  height: 2px;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  margin: var(--space-6) 0;
}

/* ============================================
   SCROLL REVEAL SYSTEM
   ============================================ */

/* Base: fade up */
/* ── Scroll reveal — progressive enhancement ─────────────
   Strategy:
   1. Content visible by default (opacity unset).
   2. main.js marks already-visible elements as .visible FIRST.
   3. THEN adds .js-ready to <html>, which hides only below-fold
      elements that haven't been marked .visible yet.
   4. IntersectionObserver reveals them as user scrolls.
   Result: no blank pages, no flash, smooth scroll animations.
   ────────────────────────────────────────────────────── */

/* Transitions always present (no-op until classes change) */
.reveal            { transition: opacity 0.65s ease, transform 0.65s ease; transition-delay: calc(var(--stagger-index, 0) * 80ms); }
.reveal-blur       { transition: opacity 0.70s ease, filter 0.70s ease, transform 0.70s ease; transition-delay: calc(var(--stagger-index, 0) * 80ms); }
.reveal-slide-left { transition: opacity 0.65s ease, transform 0.65s ease; transition-delay: calc(var(--stagger-index, 0) * 80ms); }
.reveal-slide-right{ transition: opacity 0.65s ease, transform 0.65s ease; transition-delay: calc(var(--stagger-index, 0) * 80ms); }
.reveal-scale      { transition: opacity 0.65s ease, transform 0.65s var(--transition-spring); transition-delay: calc(var(--stagger-index, 0) * 80ms); }

/* Only hide elements that js-ready confirms are below-fold AND not yet visible */
.js-ready .reveal:not(.visible)             { opacity: 0; transform: translateY(28px); }
.js-ready .reveal-blur:not(.visible)        { opacity: 0; filter: blur(10px); transform: translateY(16px); }
.js-ready .reveal-slide-left:not(.visible)  { opacity: 0; transform: translateX(-36px); }
.js-ready .reveal-slide-right:not(.visible) { opacity: 0; transform: translateX(36px); }
.js-ready .reveal-scale:not(.visible)       { opacity: 0; transform: scale(0.94); }

/* Revealed state */
.reveal.visible             { opacity: 1; transform: translateY(0); }
.reveal-blur.visible        { opacity: 1; filter: blur(0); transform: translateY(0); }
.reveal-slide-left.visible  { opacity: 1; transform: translateX(0); }
.reveal-slide-right.visible { opacity: 1; transform: translateX(0); }
.reveal-scale.visible       { opacity: 1; transform: scale(1); }

/* Legacy delay classes */
.reveal-delay-1 { --stagger-index: 1; }
.reveal-delay-2 { --stagger-index: 2; }
.reveal-delay-3 { --stagger-index: 3; }
.reveal-delay-4 { --stagger-index: 4; }

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 1024px) {
  .footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-10);
  }
}

@media (max-width: 768px) {
  .nav__links { display: none; }
  .nav__cta { display: none; }
  .nav__hamburger { display: flex; }

  .footer__inner {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .footer__bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }

  .section { padding: var(--space-16) 0; }
  .section--lg { padding: var(--space-24) 0; }
}

@media (max-width: 480px) {
  .container { padding: 0 var(--space-4); }
  .btn--lg {
    font-size: var(--text-base);
    padding: var(--space-3) var(--space-6);
  }
}