/* ==========================================================================
   VIGNESH PAI K — Editorial Design System
   A sophisticated, magazine-inspired personal portfolio
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&family=Instrument+Serif:ital@0;1&display=swap');

/* --------------------------------------------------------------------------
   Design Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette - Deep & Sophisticated */
  --bg: #f8f6f3;
  --bg-warm: #f3efe9;
  --ink: #1a1a1a;
  --ink-secondary: #4a4a4a;
  --ink-muted: #737373;
  --accent: #c4562a;
  --accent-dark: #9e4520;
  --accent-soft: rgba(196, 86, 42, 0.08);
  --card: #ffffff;
  --card-elevated: #ffffff;
  --stroke: rgba(26, 26, 26, 0.08);
  --stroke-strong: rgba(26, 26, 26, 0.15);

  /* Shadows - Refined & Layered */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04), 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05), 0 8px 24px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08), 0 24px 64px rgba(0, 0, 0, 0.06);
  --shadow-accent: 0 8px 32px rgba(196, 86, 42, 0.2);

  /* Typography Scale */
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing Scale */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-2xl: 64px;
  --space-3xl: 96px;

  /* Animation */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quad: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --duration-fast: 0.2s;
  --duration-normal: 0.4s;
  --duration-slow: 0.6s;
}

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

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  overflow-x: hidden;
}

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

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

button {
  font-family: inherit;
  cursor: pointer;
}

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

/* --------------------------------------------------------------------------
   Ambient Background — Atmospheric Depth
   -------------------------------------------------------------------------- */
.ambient {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 50% at 20% 0%, rgba(196, 86, 42, 0.06), transparent 50%),
    radial-gradient(ellipse 60% 40% at 80% 20%, rgba(196, 86, 42, 0.04), transparent 45%),
    radial-gradient(ellipse 100% 60% at 50% 100%, rgba(243, 239, 233, 0.9), transparent 60%);
}

/* Grain Texture Overlay */
.ambient::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
  opacity: 0.03;
  mix-blend-mode: multiply;
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container {
  width: min(1120px, calc(100% - 48px));
  margin-inline: auto;
}

.container--narrow {
  width: min(800px, calc(100% - 48px));
}

/* --------------------------------------------------------------------------
   Header — Editorial Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248, 246, 243, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--stroke);
  transition: all var(--duration-normal) var(--ease-out-expo);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
  gap: var(--space-lg);
}

.logo {
  position: relative;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  overflow: visible;
  border: 2px solid var(--stroke);
  background: var(--card);
  transition: all var(--duration-normal) var(--ease-out-expo);
  flex-shrink: 0;
  z-index: 50;
}

.logo::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.05);
  pointer-events: none;
  z-index: 2;
}

.logo:hover {
  transform: scale(3);
  border-color: var(--accent);
  box-shadow:
    0 20px 60px rgba(0, 0, 0, 0.3),
    0 0 0 3px var(--accent),
    0 0 0 6px rgba(196, 86, 42, 0.2);
  z-index: 200;
  cursor: zoom-in;
}

.logo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  transition: transform var(--duration-normal) var(--ease-out-expo);
}

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

.nav a {
  position: relative;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink-secondary);
  border-radius: 8px;
  transition: all var(--duration-fast) var(--ease-out-quad);
}

.nav a::before {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 14px;
  right: 14px;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--duration-normal) var(--ease-out-expo);
}

.nav a:hover {
  color: var(--ink);
  background: var(--accent-soft);
}

.nav a:hover::before {
  transform: scaleX(1);
  transform-origin: left;
}

.nav a.active {
  color: var(--ink);
  font-weight: 600;
}

.nav a.active::before {
  transform: scaleX(1);
}

/* Header Scroll State */
.site-header.is-scrolled {
  background: rgba(248, 246, 243, 0.95);
  box-shadow: var(--shadow-sm);
}

.site-header.is-scrolled .header-inner {
  padding: 12px 0;
}

.site-header.is-scrolled .logo {
  width: 40px;
  height: 40px;
}

/* --------------------------------------------------------------------------
   Hero Section — Editorial Impact
   -------------------------------------------------------------------------- */
.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-3xl);
  padding: var(--space-3xl) 0;
  align-items: center;
  min-height: calc(100vh - 200px);
}

.hero-text {
  max-width: 600px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-md);
}

.eyebrow::before {
  content: '';
  width: 24px;
  height: 2px;
  background: var(--accent);
}

.hero-text h1 {
  font-family: var(--font-display);
  font-size: clamp(3rem, 6vw, 4.5rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--ink);
  margin-bottom: var(--space-lg);
}

.tagline {
  font-size: clamp(1.125rem, 2vw, 1.35rem);
  font-weight: 500;
  line-height: 1.4;
  color: var(--ink);
  margin-bottom: var(--space-md);
}

.summary {
  font-size: 1.0625rem;
  color: var(--ink-muted);
  line-height: 1.7;
  margin-bottom: var(--space-xl);
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-xl);
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--stroke);
}

.meta span {
  font-size: 14px;
  color: var(--ink-muted);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.meta span::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}

/* Hero Card — Stats Display */
.hero-card {
  background: var(--card);
  border-radius: 20px;
  padding: var(--space-xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--stroke);
  display: grid;
  gap: var(--space-lg);
  position: relative;
  overflow: hidden;
}

.hero-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent-dark));
}

.stat {
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--stroke);
}

.stat:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.stat-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: var(--space-xs);
}

.stat-value {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.02em;
}

/* --------------------------------------------------------------------------
   Buttons — Refined Interactions
   -------------------------------------------------------------------------- */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 14px 28px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.01em;
  border-radius: 12px;
  border: 1px solid transparent;
  transition: all var(--duration-normal) var(--ease-out-expo);
  position: relative;
  overflow: hidden;
}

.button::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1), transparent);
  opacity: 0;
  transition: opacity var(--duration-fast);
}

.button:hover::before {
  opacity: 1;
}

.button.primary {
  background: var(--accent);
  color: white;
  box-shadow: var(--shadow-accent);
}

.button.primary:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(196, 86, 42, 0.3);
}

.button.ghost {
  background: var(--card);
  color: var(--ink);
  border-color: var(--stroke-strong);
  box-shadow: var(--shadow-sm);
}

.button.ghost:hover {
  background: var(--bg-warm);
  border-color: var(--ink);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* --------------------------------------------------------------------------
   Sections — Editorial Rhythm
   -------------------------------------------------------------------------- */
.section {
  padding: var(--space-3xl) 0;
}

.section-title {
  margin-bottom: var(--space-xl);
}

.section-title .eyebrow {
  margin-bottom: var(--space-sm);
}

.section-title h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

/* About Grid */
.grid-2 {
  display: grid;
  gap: var(--space-xl);
  color: var(--ink-secondary);
  font-size: 1.0625rem;
  line-height: 1.75;
}

/* Skills Pills */
.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
}

.pill-row span {
  padding: 10px 18px;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-secondary);
  background: var(--card);
  border: 1px solid var(--stroke);
  border-radius: 100px;
  transition: all var(--duration-fast) var(--ease-out-quad);
}

.pill-row span:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent-dark);
  transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   Timeline — Experience Cards
   -------------------------------------------------------------------------- */
.timeline {
  display: grid;
  gap: var(--space-lg);
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 23px;
  top: 32px;
  bottom: 32px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), var(--stroke) 50%, var(--stroke));
  border-radius: 1px;
}

.timeline-item {
  position: relative;
  background: var(--card);
  border-radius: 16px;
  padding: var(--space-lg) var(--space-lg) var(--space-lg) 60px;
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow-sm);
  transition: all var(--duration-normal) var(--ease-out-expo);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: 16px;
  top: 28px;
  width: 16px;
  height: 16px;
  background: var(--card);
  border: 3px solid var(--accent);
  border-radius: 50%;
  z-index: 1;
  transition: all var(--duration-fast);
}

.timeline-item:first-child::before {
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(196, 86, 42, 0.15);
}

.timeline-item:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.timeline-item:hover::before {
  background: var(--accent);
}

.timeline-item h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 400;
  margin-bottom: var(--space-xs);
  letter-spacing: -0.01em;
}

.timeline-item .muted {
  font-size: 13px;
  color: var(--ink-muted);
  margin-bottom: var(--space-md);
}

.timeline-item ul {
  list-style: none;
  display: grid;
  gap: var(--space-sm);
}

.timeline-item ul li {
  position: relative;
  padding-left: 20px;
  color: var(--ink-secondary);
  font-size: 15px;
  line-height: 1.6;
}

.timeline-item ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

/* --------------------------------------------------------------------------
   Writing Grid — Magazine Layout
   -------------------------------------------------------------------------- */
.writing-list {
  display: grid;
  gap: var(--space-xl);
}

.writing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.story-card {
  position: relative;
  background: var(--card);
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow-sm);
  transition: all var(--duration-normal) var(--ease-out-expo);
  display: flex;
  flex-direction: column;
}

.story-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 16px;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.05);
  pointer-events: none;
}

.story-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

.story-cover {
  width: 100%;
  height: 160px;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-out-expo);
}

.story-card:hover .story-cover {
  transform: scale(1.05);
}

.story-body {
  padding: var(--space-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: var(--card);
  position: relative;
}

.story-body::before {
  content: '';
  position: absolute;
  top: 0;
  left: var(--space-lg);
  right: var(--space-lg);
  height: 1px;
  background: var(--stroke);
}

.story-title {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 400;
  line-height: 1.35;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.story-card:hover .story-title {
  color: var(--accent-dark);
}

.more-toggle {
  justify-self: start;
}

/* --------------------------------------------------------------------------
   Cards — General Purpose
   -------------------------------------------------------------------------- */
.card {
  background: var(--card);
  border-radius: 16px;
  padding: var(--space-lg);
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow-sm);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.card-tags {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.card-tags span {
  font-size: 12px;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 100px;
  background: var(--accent-soft);
  color: var(--accent-dark);
}

/* --------------------------------------------------------------------------
   Contact Section
   -------------------------------------------------------------------------- */
.contact {
  text-align: center;
  max-width: 600px;
  margin-inline: auto;
}

.contact .section-title {
  margin-bottom: var(--space-lg);
}

.contact .muted {
  font-size: 1.125rem;
  color: var(--ink-secondary);
  margin-bottom: var(--space-xl);
}

.contact .muted a {
  color: var(--accent);
  font-weight: 500;
  border-bottom: 1px solid transparent;
  transition: border-color var(--duration-fast);
}

.contact .muted a:hover {
  border-color: var(--accent);
}

.contact-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

/* --------------------------------------------------------------------------
   Footer — Minimal & Clean
   -------------------------------------------------------------------------- */
.footer {
  border-top: 1px solid var(--stroke);
  padding: var(--space-xl) 0 var(--space-2xl);
  background: var(--bg-warm);
  margin-top: var(--space-2xl);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer p {
  font-size: 14px;
  color: var(--ink-muted);
}

.back-to-top {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  background: none;
  border: none;
  padding: 8px 0;
  position: relative;
}

.back-to-top::after {
  content: '';
  position: absolute;
  bottom: 6px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--duration-normal) var(--ease-out-expo);
}

.back-to-top:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* --------------------------------------------------------------------------
   Utility Classes
   -------------------------------------------------------------------------- */
.muted {
  color: var(--ink-muted);
}

.link {
  color: var(--accent);
  font-weight: 500;
  border-bottom: 1px solid transparent;
  transition: border-color var(--duration-fast);
}

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

/* --------------------------------------------------------------------------
   Animations — Reveal on Scroll
   -------------------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity var(--duration-slow) var(--ease-out-expo),
    transform var(--duration-slow) var(--ease-out-expo);
}

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

/* Staggered Children Animation */
.stagger-children > * {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity var(--duration-normal) var(--ease-out-expo),
    transform var(--duration-normal) var(--ease-out-expo);
}

.stagger-children.is-visible > *:nth-child(1) { transition-delay: 0ms; }
.stagger-children.is-visible > *:nth-child(2) { transition-delay: 60ms; }
.stagger-children.is-visible > *:nth-child(3) { transition-delay: 120ms; }
.stagger-children.is-visible > *:nth-child(4) { transition-delay: 180ms; }
.stagger-children.is-visible > *:nth-child(5) { transition-delay: 240ms; }
.stagger-children.is-visible > *:nth-child(6) { transition-delay: 300ms; }
.stagger-children.is-visible > *:nth-child(7) { transition-delay: 360ms; }
.stagger-children.is-visible > *:nth-child(8) { transition-delay: 420ms; }
.stagger-children.is-visible > *:nth-child(9) { transition-delay: 480ms; }

.stagger-children.is-visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* --------------------------------------------------------------------------
   Responsive Design
   -------------------------------------------------------------------------- */
@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    min-height: auto;
    padding: var(--space-2xl) 0;
  }

  .hero-text {
    max-width: 100%;
  }

  .hero-card {
    max-width: 400px;
  }

  .writing-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .timeline::before {
    display: none;
  }

  .timeline-item {
    padding-left: var(--space-lg);
  }

  .timeline-item::before {
    display: none;
  }
}

@media (max-width: 700px) {
  :root {
    --space-3xl: 64px;
    --space-2xl: 48px;
  }

  .container {
    width: calc(100% - 32px);
  }

  .nav {
    gap: 2px;
  }

  .nav a {
    padding: 8px 10px;
    font-size: 13px;
  }

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

  .hero-text h1 {
    font-size: clamp(2.25rem, 8vw, 3rem);
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .button {
    width: 100%;
  }

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

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
}

@media (max-width: 480px) {
  .header-inner {
    flex-wrap: wrap;
    gap: var(--space-md);
  }

  .nav {
    order: 2;
    width: 100%;
    justify-content: space-between;
  }

  .logo {
    width: 40px;
    height: 40px;
  }
}

/* --------------------------------------------------------------------------
   Print Styles
   -------------------------------------------------------------------------- */
@media print {
  .ambient,
  .back-to-top,
  .nav {
    display: none;
  }

  body {
    background: white;
  }

  .site-header {
    position: static;
    background: white;
  }
}