/* ═══════════════════════════════════════════════════════════════
   BHUPENDRASINH THAKRE — PERSONAL SITE
   Design: Warm Obsidian · Dieter Rams Minimal · Executive Dark
   ═══════════════════════════════════════════════════════════════ */

/* ─── NAV ────────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  padding: 0 var(--container-pad);
  background: transparent;
  transition: background 0.4s ease, border-color 0.4s ease;
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: rgba(10, 9, 8, 0.92);
  border-bottom-color: var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 60px;
}

.nav-name {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--accent);
  text-decoration: none;
  font-weight: 400;
  transition: color 0.2s ease;
}

.nav-name:hover {
  color: var(--accent-light);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
  text-transform: uppercase;
}

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

@media (max-width: 640px) {
  .nav-links {
    gap: 20px;
  }
  .nav-link {
    font-size: 0.65rem;
  }
}

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

:root {
  /* Color System */
  --bg-base:        #0A0908;
  --bg-surface:     #111010;
  --bg-elevated:    #1A1817;
  --border:         #252220;
  --border-light:   #2E2A27;

  --text-primary:   #EDE8E0;
  --text-secondary: #7A7068;
  --text-tertiary:  #4A4440;

  --accent:         #B8956A;
  --accent-light:   #D4B48C;
  --accent-dim:     #7A6245;

  --sage:           #6BA88A;

  /* Typography */
  --font-display:   'Cormorant Garamond', Georgia, serif;
  --font-body:      'DM Sans', system-ui, sans-serif;
  --font-mono:      'JetBrains Mono', 'Courier New', monospace;

  /* Spacing */
  --section-gap:    clamp(80px, 12vw, 160px);
  --container-max:  1140px;
  --container-pad:  clamp(24px, 5vw, 60px);

  /* Transitions */
  --ease-out-expo:  cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out:    cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  background-color: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Custom selection */
::selection {
  background: var(--accent);
  color: var(--bg-base);
}

/* ─── GRAIN TEXTURE ─────────────────────────────────────────── */
.grain {
  position: fixed;
  inset: -50%;
  width: 200%;
  height: 200%;
  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='1'/%3E%3C/svg%3E");
  background-size: 200px 200px;
  opacity: 0.035;
  pointer-events: none;
  z-index: 100;
  animation: grain-shift 8s steps(2) infinite;
}

@keyframes grain-shift {
  0%   { transform: translate(0, 0); }
  25%  { transform: translate(-1%, 1%); }
  50%  { transform: translate(1%, -1%); }
  75%  { transform: translate(-1%, -1%); }
  100% { transform: translate(1%, 1%); }
}

/* ─── CURSOR GLOW ───────────────────────────────────────────── */
.cursor-glow {
  position: fixed;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(184, 149, 106, 0.07) 0%, transparent 70%);
  pointer-events: none;
  transform: translate(-50%, -50%);
  z-index: 1;
  transition: opacity 0.3s ease;
}

/* ─── UTILITY ───────────────────────────────────────────────── */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  font-weight: 300;
}

.dim { color: var(--text-secondary); }

.amber { color: var(--accent); }

/* ─── SCROLL REVEAL ─────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 0.8s var(--ease-out-expo),
    transform 0.8s var(--ease-out-expo);
}

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

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }

/* ─── SECTION HEADER ────────────────────────────────────────── */
.section-header {
  display: flex;
  align-items: baseline;
  gap: 20px;
  margin-bottom: clamp(40px, 6vw, 72px);
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.section-number {
  color: var(--accent-dim);
  font-size: 0.7rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.section-sub {
  margin-left: auto;
  color: var(--text-tertiary);
}

/* ═══════════════════════════════════════════════════════════════
   HERO
   ═══════════════════════════════════════════════════════════════ */
.hero {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(80px, 12vw, 140px) var(--container-pad);
  position: relative;
  max-width: var(--container-max);
  margin: 0 auto;
}

.hero-label {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.hero-label .dot {
  color: var(--text-tertiary);
}

.hero-name {
  font-family: var(--font-display);
  font-size: clamp(54px, 10vw, 118px);
  font-weight: 700;
  line-height: 0.92;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
}

.name-line {
  display: block;
}

.hero-rule {
  width: clamp(60px, 8vw, 100px);
  height: 1px;
  background: var(--accent);
  margin: clamp(24px, 3.5vw, 40px) 0;
}

.hero-tagline {
  font-family: var(--font-body);
  font-size: clamp(1rem, 2.2vw, 1.3rem);
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 500px;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(28px, 4vw, 48px);
}

.badge {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--accent-dim);
  border: 1px solid var(--border-light);
  padding: 5px 12px;
  border-radius: 2px;
  text-transform: uppercase;
  transition: border-color 0.3s ease, color 0.3s ease;
}

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

.scroll-hint {
  position: absolute;
  bottom: clamp(32px, 5vw, 56px);
  left: var(--container-pad);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}

.scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--accent-dim), transparent);
  animation: scroll-pulse 2.5s ease-in-out infinite;
}

@keyframes scroll-pulse {
  0%, 100% { opacity: 0.4; height: 48px; }
  50%       { opacity: 1;   height: 64px; }
}

/* ═══════════════════════════════════════════════════════════════
   SIGNAL
   ═══════════════════════════════════════════════════════════════ */
.signal {
  padding: clamp(60px, 10vw, 120px) 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-surface);
  position: relative;
  overflow: hidden;
}

.signal::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(184, 149, 106, 0.04) 0%, transparent 65%);
  pointer-events: none;
}

.signal-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 0;
}

.signal-item {
  text-align: center;
  padding: 24px 16px;
}

.signal-number {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 6vw, 5.5rem);
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.signal-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
  letter-spacing: 0.06em;
  line-height: 1.5;
  text-transform: uppercase;
}

.signal-divider {
  width: 1px;
  height: 60px;
  background: var(--border-light);
  align-self: center;
}

/* ═══════════════════════════════════════════════════════════════
   ABOUT
   ═══════════════════════════════════════════════════════════════ */
.about {
  padding: var(--section-gap) 0;
}

.about-grid {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: clamp(40px, 6vw, 80px);
  align-items: start;
}

.about-label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 6px;
}

.about-text {
  font-size: clamp(1rem, 1.8vw, 1.13rem);
  color: var(--text-primary);
  line-height: 1.85;
  font-weight: 300;
  max-width: 680px;
}

.about-text + .about-text {
  margin-top: 24px;
}

.about-quote {
  margin-top: 48px;
  padding: 28px 32px;
  border-left: 2px solid var(--accent);
  background: var(--bg-surface);
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  font-style: italic;
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 600px;
}

.quote-mark {
  color: var(--accent-dim);
  font-size: 1.5em;
  line-height: 0;
  vertical-align: -0.3em;
}

/* ═══════════════════════════════════════════════════════════════
   CHAPTERS
   ═══════════════════════════════════════════════════════════════ */
.chapters {
  padding: var(--section-gap) 0;
  background: var(--bg-surface);
}

.chapters-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 24px;
  align-items: start;
}

.chapters-right {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.chapter {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  padding: clamp(24px, 3.5vw, 40px);
  border-radius: 2px;
  transition:
    border-color 0.3s ease,
    transform 0.3s var(--ease-out-expo),
    box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
}

.chapter::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: var(--accent);
  transition: width 0.3s var(--ease-out-expo);
}

.chapter:hover {
  border-color: var(--accent-dim);
  transform: translateY(-3px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}

.chapter:hover::before {
  width: 2px;
}

.chapter--featured {
  border-color: var(--border-light);
}

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

.chapter-act {
  color: var(--accent-dim);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.chapter-company {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-tertiary);
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}

.chapter-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 16px;
}

.chapter-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.75;
  font-weight: 300;
  margin-bottom: 20px;
}

.chapter-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--text-tertiary);
  border: 1px solid var(--border);
  padding: 3px 9px;
  border-radius: 1px;
  letter-spacing: 0.04em;
  transition: color 0.2s ease, border-color 0.2s ease;
}

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

/* ═══════════════════════════════════════════════════════════════
   THINKING
   ═══════════════════════════════════════════════════════════════ */
.thinking {
  padding: var(--section-gap) 0;
}

.thoughts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.thought {
  background: var(--bg-base);
  padding: clamp(28px, 4vw, 44px);
  transition: background 0.3s ease;
  position: relative;
}

.thought:hover {
  background: var(--bg-elevated);
}

.thought::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease-out-expo);
}

.thought:hover::after {
  transform: scaleX(1);
}

.thought-text {
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  font-style: italic;
  color: var(--text-primary);
  line-height: 1.6;
  font-weight: 400;
  margin-bottom: 20px;
}

.thought-meta {
  font-size: 0.68rem;
  color: var(--text-tertiary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ═══════════════════════════════════════════════════════════════
   PUBLISHED
   ═══════════════════════════════════════════════════════════════ */
.published {
  padding: var(--section-gap) 0;
  background: var(--bg-surface);
}

.pub-list {
  display: flex;
  flex-direction: column;
}

.pub-item {
  display: grid;
  grid-template-columns: 56px 1fr auto;
  align-items: center;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  transition: background 0.2s ease;
  cursor: default;
}

a.pub-item {
  cursor: pointer;
}

a.pub-item:hover .pub-title {
  color: var(--accent-light);
}

a.pub-item:hover .pub-arrow {
  color: var(--accent);
  transform: translate(3px, -3px);
}

.pub-year {
  color: var(--text-tertiary);
  font-size: 0.72rem;
}

.pub-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.pub-title {
  font-size: 0.95rem;
  color: var(--text-primary);
  font-weight: 400;
  transition: color 0.2s ease;
  line-height: 1.45;
}

.pub-venue {
  font-size: 0.7rem;
  color: var(--text-tertiary);
}

.pub-arrow {
  color: var(--text-tertiary);
  font-size: 1rem;
  transition: color 0.2s ease, transform 0.3s var(--ease-out-expo);
}

.pub-type {
  font-size: 0.68rem;
  color: var(--text-tertiary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.pub-type.amber {
  color: var(--accent-dim);
}

/* ═══════════════════════════════════════════════════════════════
   CONNECT
   ═══════════════════════════════════════════════════════════════ */
.connect {
  padding: var(--section-gap) 0;
  position: relative;
  overflow: hidden;
}

.connect::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 30%;
  transform: translate(-50%, -50%);
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(184, 149, 106, 0.05) 0%, transparent 65%);
  pointer-events: none;
}

.connect-inner {
  max-width: 640px;
}

.connect-heading {
  font-family: var(--font-display);
  font-size: clamp(3rem, 7vw, 6rem);
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 24px;
}

.connect-sub {
  font-size: clamp(0.95rem, 1.8vw, 1.1rem);
  color: var(--text-secondary);
  font-weight: 300;
  line-height: 1.7;
  margin-bottom: 40px;
}

.connect-links {
  display: flex;
  align-items: center;
  gap: 20px;
}

.connect-dot {
  color: var(--text-tertiary);
  font-size: 1.2rem;
}

.connect-link {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.5vw, 1.7rem);
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  position: relative;
  transition: color 0.3s ease;
}

.connect-link::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease-out-expo);
}

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

.connect-link:hover::after {
  transform: scaleX(1);
}

/* ═══════════════════════════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════════════════════════ */
.footer {
  padding: 28px 0;
  border-top: 1px solid var(--border);
  background: var(--bg-surface);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-name {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
}

.footer-update {
  font-size: 0.68rem;
  letter-spacing: 0.06em;
}

/* ═══════════════════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════════════════ */
@media (max-width: 900px) {
  .signal-grid {
    grid-template-columns: 1fr 1fr;
    gap: 0;
  }
  .signal-divider:nth-child(4) {
    display: none;
  }
  .signal-divider {
    display: none;
  }
  .signal-item {
    border-bottom: 1px solid var(--border);
  }
  .signal-item:nth-child(5),
  .signal-item:nth-child(7) {
    border-bottom: none;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .about-label {
    flex-direction: row;
    align-items: center;
    gap: 12px;
  }

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

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

@media (max-width: 640px) {
  .hero-name {
    font-size: clamp(46px, 13vw, 72px);
  }

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

  .section-sub {
    display: none;
  }

  .pub-item {
    grid-template-columns: 44px 1fr auto;
    gap: 16px;
  }

  .connect-links {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .connect-dot {
    display: none;
  }

  .footer-inner {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
}

/* ─── SIGNAL RESPONSIVE GRID ────────────────────────────────── */
@media (max-width: 900px) {
  .signal-grid {
    grid-template-columns: 1fr 1fr;
    gap: 0;
    background: var(--border);
    gap: 1px;
  }
  .signal-item {
    background: var(--bg-surface);
  }
  .signal-divider {
    display: none;
  }
}