/* ============================================================
   Paveul.github.io — Style Sheet
   All colours and key values are defined as custom properties
   below. Edit these to re-theme the entire site instantly.
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
  /* Background */
  --color-bg-start: #0a0a0f;
  --color-bg-end: #111128;
  --color-surface: rgba(255, 255, 255, 0.04);
  --color-surface-hover: rgba(255, 255, 255, 0.08);
  --color-border: rgba(255, 255, 255, 0.08);

  /* Text */
  --color-text: #e8e8f0;
  --color-text-muted: #8888a4;
  --color-text-heading: #ffffff;

  /* Accent */
  --color-accent: #6c63ff;
  --color-accent-light: #8b83ff;
  --color-accent-glow: rgba(108, 99, 255, 0.35);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2.25rem;
  --font-size-3xl: 3.5rem;
  --font-size-display: clamp(2.5rem, 6vw, 5rem);

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

  /* Layout */
  --max-width: 1100px;
  --nav-height: 64px;

  /* Transitions */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --duration-fast: 0.2s;
  --duration-normal: 0.4s;
  --duration-slow: 0.8s;

  /* Border radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--color-text);
  background: linear-gradient(160deg, var(--color-bg-start) 0%, var(--color-bg-end) 100%);
  background-attachment: fixed;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Subtle grain 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");
  background-repeat: repeat;
  pointer-events: none;
  z-index: 0;
}

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

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

a:hover {
  color: var(--color-text-heading);
}

/* ---------- Navbar ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
  z-index: 1000;
  transition: background var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
}

.navbar.scrolled {
  background: rgba(10, 10, 15, 0.75);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  box-shadow: 0 1px 0 var(--color-border);
}

.navbar__brand {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text-heading);
  letter-spacing: -0.02em;
}

.navbar__links {
  display: flex;
  gap: var(--space-md);
  list-style: none;
}

.navbar__links a {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: var(--space-xs) 0;
  position: relative;
  transition: color var(--duration-fast) var(--ease-out);
}

.navbar__links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
  transition: width var(--duration-normal) var(--ease-out);
}

.navbar__links a:hover {
  color: var(--color-text-heading);
}

.navbar__links a:hover::after {
  width: 100%;
}

/* Mobile menu toggle */
.navbar__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
}

.navbar__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--duration-fast) var(--ease-out),
              opacity var(--duration-fast) var(--ease-out);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: calc(var(--nav-height) + var(--space-xl)) var(--space-lg) var(--space-xl);
  text-align: center;
  z-index: 1;
}

.hero__name {
  font-size: var(--font-size-display);
  font-weight: 800;
  color: var(--color-text-heading);
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: var(--space-sm);
}

.hero__tagline {
  font-size: var(--font-size-xl);
  font-weight: 400;
  color: var(--color-text-muted);
  max-width: 600px;
  margin-bottom: var(--space-lg);
}

/* CTA Button */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.85rem 2rem;
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  font-weight: 600;
  color: #ffffff;
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
}

.btn::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: inherit;
  background: var(--color-accent);
  opacity: 0;
  filter: blur(16px);
  transition: opacity var(--duration-normal) var(--ease-out);
  z-index: -1;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px var(--color-accent-glow);
  color: #ffffff;
}

.btn:hover::before {
  opacity: 0.5;
}

.btn:active {
  transform: translateY(0);
}

/* ---------- Sections (shared) ---------- */
.section {
  position: relative;
  z-index: 1;
  padding: var(--space-2xl) var(--space-lg);
}

.section__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section__heading {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-text-heading);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-xs);
}

.section__subheading {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  margin-bottom: var(--space-xl);
  max-width: 600px;
}

/* ---------- Cards grid ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-md);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  transition: background var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out),
              transform var(--duration-fast) var(--ease-out);
}

.card:hover {
  background: var(--color-surface-hover);
  border-color: rgba(255, 255, 255, 0.14);
  transform: translateY(-4px);
}

.card__title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text-heading);
  margin-bottom: var(--space-xs);
}

.card__description {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ---------- Contact ---------- */
.contact__grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.contact__item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out);
}

.contact__item:hover {
  background: var(--color-surface-hover);
  border-color: rgba(255, 255, 255, 0.14);
}

.contact__icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--color-accent-light);
}

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

.contact__value {
  font-size: var(--font-size-base);
  color: var(--color-text-heading);
  font-weight: 500;
}

/* ---------- Footer ---------- */
.footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--space-lg) var(--space-lg);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* ---------- Reveal animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

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

/* Staggered children */
.reveal-stagger > .reveal:nth-child(1) { transition-delay: 0s; }
.reveal-stagger > .reveal:nth-child(2) { transition-delay: 0.1s; }
.reveal-stagger > .reveal:nth-child(3) { transition-delay: 0.2s; }
.reveal-stagger > .reveal:nth-child(4) { transition-delay: 0.3s; }
.reveal-stagger > .reveal:nth-child(5) { transition-delay: 0.4s; }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .navbar__links {
    position: fixed;
    top: var(--nav-height);
    right: 0;
    width: 260px;
    height: calc(100vh - var(--nav-height));
    flex-direction: column;
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: var(--space-lg);
    gap: var(--space-sm);
    transform: translateX(100%);
    transition: transform var(--duration-normal) var(--ease-out);
    border-left: 1px solid var(--color-border);
  }

  .navbar__links.open {
    transform: translateX(0);
  }

  .navbar__toggle {
    display: flex;
  }

  .hero__name {
    font-size: clamp(2rem, 8vw, 3rem);
  }

  .hero__tagline {
    font-size: var(--font-size-base);
  }

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

  .cards {
    grid-template-columns: 1fr;
  }

  .contact__grid {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .navbar {
    padding: 0 var(--space-sm);
  }
}