/* ============================================
   LXHI.DEV – Premium Design System
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&family=Inter:wght@300;400;500;600&display=swap');

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Color Hues & Setup */
  --bg-h: 224;
  --accent-h: 217;
  --accent-s: 91%;
  --accent-l: 60%;

  /* Dark Theme Palette (Default) */
  --bg-0: hsl(var(--bg-h), 25%, 4%);
  --bg-1: hsl(var(--bg-h), 20%, 7%);
  --bg-2: hsl(var(--bg-h), 18%, 11%);
  --bg-3: hsl(var(--bg-h), 15%, 16%);
  
  --border: hsl(var(--bg-h), 14%, 18%);
  --border-soft: hsl(var(--bg-h), 14%, 12%);

  --text-primary: hsl(240, 15%, 95%);
  --text-secondary: hsl(245, 10%, 76%);
  --text-muted: hsl(245, 8%, 50%);

  --accent: hsl(var(--accent-h), var(--accent-s), var(--accent-l));
  --accent-light: hsl(var(--accent-h), var(--accent-s), 68%);
  --accent-dim: hsla(var(--accent-h), var(--accent-s), var(--accent-l), 0.16);
  --accent-glow: hsla(var(--accent-h), var(--accent-s), var(--accent-l), 0.35);

  --teal: hsl(171, 85%, 48%);
  --teal-dim: hsla(171, 85%, 48%, 0.15);

  --purple: hsl(265, 88%, 62%);
  --purple-dim: hsla(265, 88%, 62%, 0.15);

  /* Glassmorphism properties */
  --glass-bg: hsla(var(--bg-h), 20%, 7%, 0.65);
  --glass-border: hsla(0, 0%, 100%, 0.06);
  --glass-border-hover: hsla(var(--accent-h), var(--accent-s), var(--accent-l), 0.22);
  --glass-blur: blur(20px);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 32px;

  --shadow-card: 0 20px 48px -12px rgba(0,0,0,0.65);
  --shadow-sm: 0 4px 16px rgba(0,0,0,0.35);

  --font-heading: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --nav-height: 72px;
  --max-w: 1160px;
  --section-gap: 120px;
}

/* ---------- Light Theme Overrides ---------- */
[data-theme="light"] {
  --bg-h: 220; /* Cooler, premium blue-grey hue */
  
  --bg-0: hsl(var(--bg-h), 24%, 90%); /* Elegant, rich platinum slate-grey */
  --bg-1: hsl(var(--bg-h), 20%, 94%); /* Container/Card background */
  --bg-2: hsl(var(--bg-h), 18%, 84%); /* Secondary background */
  --bg-3: hsl(var(--bg-h), 16%, 77%); /* Focus/Hover background */
  
  --border: hsl(var(--bg-h), 15%, 72%);
  --border-soft: hsl(var(--bg-h), 16%, 80%);

  --text-primary: hsl(var(--bg-h), 50%, 10%); /* High-contrast slate-black text */
  --text-secondary: hsl(var(--bg-h), 24%, 22%); /* Readable charcoal secondary text */
  --text-muted: hsl(var(--bg-h), 15%, 38%);

  --glass-bg: hsla(var(--bg-h), 20%, 94%, 0.75);
  --glass-border: hsla(var(--bg-h), 20%, 10%, 0.12);
  --glass-border-hover: hsla(var(--accent-h), var(--accent-s), var(--accent-l), 0.35);

  --shadow-card: 0 20px 40px -16px rgba(15, 23, 42, 0.14);
  --shadow-sm: 0 4px 12px rgba(15, 23, 42, 0.06);
}

[data-theme="light"] body::before {
  opacity: 0.12; /* Less noise in light mode */
}

/* ---------- Ambient Glow Orbs ---------- */
.glow-orb {
  position: fixed;
  width: 700px;
  height: 700px;
  border-radius: 50%;
  filter: blur(130px);
  opacity: 0.22; /* Saturated values for more color depth */
  pointer-events: none;
  z-index: -1;
  transition: opacity 0.5s ease;
}

[data-theme="light"] .glow-orb {
  opacity: 0.1;
}

.glow-orb--1 {
  background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
  top: -15%;
  right: -10%;
  animation: floatOrb1 24s infinite alternate ease-in-out;
}

.glow-orb--2 {
  background: radial-gradient(circle, var(--teal) 0%, transparent 70%);
  bottom: -15%;
  left: -10%;
  animation: floatOrb2 28s infinite alternate ease-in-out;
}

.glow-orb--3 {
  background: radial-gradient(circle, var(--purple) 0%, transparent 70%);
  top: 35%;
  left: 25%;
  width: 500px;
  height: 500px;
  opacity: 0.14;
  animation: floatOrb3 22s infinite alternate ease-in-out;
}

[data-theme="light"] .glow-orb--3 {
  opacity: 0.07;
}

@keyframes floatOrb1 {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-80px, 80px) scale(1.15); }
  100% { transform: translate(40px, -40px) scale(0.9); }
}

@keyframes floatOrb2 {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(100px, -80px) scale(0.9); }
  100% { transform: translate(-60px, 60px) scale(1.15); }
}

@keyframes floatOrb3 {
  0% { transform: translate(0, 0) scale(0.9); }
  50% { transform: translate(-50px, -50px) scale(1.12); }
  100% { transform: translate(50px, 50px) scale(0.9); }
}

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

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

body {
  background-color: var(--bg-0);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background-color 0.4s ease, color 0.4s ease;
}

::selection {
  background: var(--accent);
  color: #fff;
}

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

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

/* ---------- Layout Utilities ---------- */
.container {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: 24px;
}

.section { padding-block: var(--section-gap); }
.section--sm { padding-block: 70px; }

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.85em;
}

.label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-primary);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--accent-dim), var(--purple-dim));
  border: 1px solid hsla(var(--accent-h), var(--accent-s), var(--accent-l), 0.25);
  padding: 6px 16px;
  border-radius: 30px;
  box-shadow: 0 0 16px hsla(var(--accent-h), var(--accent-s), var(--accent-l), 0.08);
}

.label::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  padding-inline: 0;
}

.nav.scrolled {
  top: 16px;
  max-width: calc(var(--max-w) - 32px);
  margin-inline: auto;
  left: 16px;
  right: 16px;
  height: 60px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

.nav__inner {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: 24px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav.scrolled .nav__inner {
  padding-inline: 18px;
}

.nav__logo {
  display: flex;
  align-items: center;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav__logo:hover {
  transform: scale(1.04);
}

.nav__logo img {
  height: 38px;
  width: auto;
  object-fit: contain;
  border-radius: 4px;
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.15));
  transition: height 0.4s cubic-bezier(0.16, 1, 0.3, 1), filter 0.3s ease;
}

[data-theme="light"] .nav__logo img {
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.28)) drop-shadow(0 0 1px rgba(0, 0, 0, 0.15));
}

.nav.scrolled .nav__logo img {
  height: 30px;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav__links a {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: all 0.25s ease;
  position: relative;
}

.nav__links a:hover {
  color: var(--text-primary);
  background: var(--bg-3);
}

.nav__links a.active {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--purple));
  box-shadow: 0 4px 12px hsla(var(--accent-h), var(--accent-s), var(--accent-l), 0.35);
}

.nav__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}

.nav__burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

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

.nav__mobile {
  display: none;
  position: fixed;
  top: calc(var(--nav-height) + 12px);
  left: 16px; right: 16px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 16px;
  z-index: 99;
  flex-direction: column;
  gap: 4px;
  box-shadow: var(--shadow-card);
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.nav__mobile.open {
  display: flex;
  opacity: 1;
  transform: translateY(0);
}

.nav.scrolled + .nav__mobile {
  top: 84px;
}

.nav__mobile a {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  transition: color 0.2s, background 0.2s;
}

.nav__mobile a:hover,
.nav__mobile a.active {
  color: var(--text-primary);
  background: var(--bg-3);
}

.nav__mobile a.active {
  color: var(--accent);
  background: var(--accent-dim);
}

/* ---------- Theme Toggle ---------- */
.theme-toggle {
  background: transparent;
  border: 1px solid var(--border-soft);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: color 0.25s, background 0.25s, border-color 0.25s;
  margin-left: 8px;
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--glass-border-hover);
  background: var(--bg-2);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
  transition: transform 0.5s ease;
}

.theme-toggle:hover svg {
  transform: rotate(30deg);
}

[data-theme="light"] .theme-toggle .moon-icon { display: block; }
[data-theme="light"] .theme-toggle .sun-icon { display: none; }
[data-theme="dark"] .theme-toggle .moon-icon { display: none; }
[data-theme="dark"] .theme-toggle .sun-icon { display: block; }
:root:not([data-theme="light"]) .theme-toggle .moon-icon { display: none; }
:root:not([data-theme="light"]) .theme-toggle .sun-icon { display: block; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  white-space: nowrap;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn--primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 16px hsla(var(--accent-h), var(--accent-s), var(--accent-l), 0.3);
}

.btn--primary:hover {
  background: var(--accent-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px hsla(var(--accent-h), var(--accent-s), var(--accent-l), 0.45);
}

.btn--primary::after {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 50%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.22), transparent);
  transform: skewX(-25deg);
  transition: left 0.75s ease;
}

.btn--primary:hover::after {
  left: 150%;
}

.btn--ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.btn--ghost:hover {
  background: var(--bg-3);
  color: var(--text-primary);
  border-color: var(--border);
}

.btn--outline {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}

.btn--outline:hover {
  background: var(--accent-dim);
  transform: translateY(-1px);
}

/* ---------- Cards ---------- */
.card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.3s, transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s;
  position: relative;
}

.card:hover {
  border-color: var(--glass-border-hover);
  transform: translateY(-5px);
  box-shadow: var(--shadow-card);
}

/* ---------- Section Headers ---------- */
.section-header {
  margin-bottom: 64px;
}

.section-header .label {
  display: inline-flex;
  margin-bottom: 16px;
}

.section-header h2 {
  font-size: clamp(2rem, 4.5vw, 3rem);
  color: var(--text-primary);
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--accent-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-header p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 580px;
  line-height: 1.8;
}

/* ---------- Divider ---------- */
.divider {
  height: 1px;
  background: linear-gradient(to right, transparent, var(--border), transparent);
  margin-block: 0;
}

/* ---------- Tag Chips ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  padding: 5px 12px;
  border-radius: 6px;
  border: 1px solid var(--border-soft);
  color: var(--text-secondary);
  background: var(--bg-2);
  transition: all 0.25s ease;
}

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

.tag--accent {
  border-color: var(--accent-dim);
  color: var(--accent);
  background: var(--accent-dim);
}

.tag--accent:hover {
  border-color: var(--accent);
}

.tag--teal {
  border-color: var(--teal-dim);
  color: var(--teal);
  background: var(--teal-dim);
}

.tag--teal:hover {
  border-color: var(--teal);
}

/* ---------- Footer ---------- */
.footer {
  background: var(--bg-1);
  border-top: 1px solid var(--border-soft);
  padding-block: 60px;
}

.footer__inner {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}

.footer__logo {
  display: flex;
  align-items: center;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.footer__logo:hover {
  transform: scale(1.04);
}

.footer__logo img {
  height: 28px;
  width: auto;
  object-fit: contain;
  opacity: 0.55;
  filter: grayscale(0.2);
  transition: opacity 0.3s ease, filter 0.3s ease;
}

[data-theme="light"] .footer__logo img {
  filter: grayscale(0.2) drop-shadow(0 1px 4px rgba(0, 0, 0, 0.15));
}

.footer__logo:hover img {
  opacity: 0.95;
  filter: grayscale(0);
}

[data-theme="light"] .footer__logo:hover img {
  filter: grayscale(0) drop-shadow(0 2px 6px rgba(0, 0, 0, 0.22));
}

.footer__copy {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer__links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer__links a {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color 0.25s;
}

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

/* ---------- Page Hero ---------- */
.page-hero {
  padding-top: calc(var(--nav-height) + 80px);
  padding-bottom: 80px;
  position: relative;
}

.page-hero .label { margin-bottom: 20px; }
.page-hero h1 {
  font-size: clamp(2.4rem, 6vw, 3.8rem);
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--accent-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-hero p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.85;
}

/* ---------- Reveal Animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* ---------- Noise Texture Overlay ---------- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 999;
  opacity: 0.3;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  :root { --section-gap: 80px; }

  .nav__links { display: none; }
  .nav__burger { display: flex; }

  .footer__inner { flex-direction: column; align-items: flex-start; }
}

/* ---------- Card Spotlight Glow Effect ---------- */
.card, .project-card, .skill-card, .contact-form, .about-teaser {
  position: relative;
  overflow: hidden;
}

.card::before, 
.project-card::before, 
.skill-card::before, 
.contact-form::before, 
.about-teaser::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(350px circle at var(--mouse-x, 0px) var(--mouse-y, 0px), hsla(var(--accent-h), var(--accent-s), var(--accent-l), 0.07), transparent 80%);
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
  z-index: 1;
}

.card:hover::before, 
.project-card:hover::before, 
.skill-card:hover::before, 
.contact-form:hover::before, 
.about-teaser:hover::before {
  opacity: 1;
}