/* ==========================================================================
   Prasanjeet Debnath — Portfolio
   Warm editorial theme: paper, ink, one restrained accent. No gradients,
   no glow effects — just type, hairlines, and whitespace.
   ========================================================================== */

:root {
  --bg: #f6f1e6;
  --bg-alt: #efe7d6;
  --surface: #fffcf6;
  --ink: #201d19;
  --ink-muted: #5c564c;
  --ink-faint: #8d8575;
  --border: rgba(32, 29, 25, 0.14);
  --border-soft: rgba(32, 29, 25, 0.08);

  --accent: #a8462f;
  --accent-dark: #7e331f;

  --font-serif: "Fraunces", Georgia, serif;
  --font-sans: "Inter", -apple-system, sans-serif;

  --container-w: 1080px;
  --radius: 3px;
  --transition: 0.25s ease;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 28px;
}

/* Subtle paper grain — barely-there, not a design gimmick */
.paper-texture {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 2;
  opacity: 0.025;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- Reveal animation (kept minimal — fade + tiny rise only) ---------- */
.reveal {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background var(--transition), border-color var(--transition);
}
.site-header.scrolled {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.logo {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 500;
  font-size: 1.4rem;
}
.logo .dot { color: var(--accent); }

.nav-desktop {
  display: none;
  align-items: center;
  gap: 34px;
}
.nav-desktop a {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--ink-muted);
  transition: color var(--transition);
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
}
.nav-desktop a:hover { color: var(--ink); border-color: var(--ink); }
.nav-desktop a.nav-cta {
  padding: 8px 18px;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  color: var(--ink);
}
.nav-desktop a.nav-cta:hover {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}

@media (min-width: 860px) {
  .nav-desktop { display: flex; }
  .nav-toggle { display: none; }
}

.nav-toggle {
  width: 40px; height: 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  width: 22px; height: 1.5px;
  background: var(--ink);
  transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle.active span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

.nav-mobile {
  max-height: 0;
  overflow: hidden;
  background: var(--bg);
  border-bottom: 1px solid transparent;
  transition: max-height var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
}
.nav-mobile.open {
  max-height: 400px;
  border-bottom: 1px solid var(--border);
}
.nav-mobile a {
  padding: 15px 28px;
  border-top: 1px solid var(--border-soft);
  font-weight: 500;
  color: var(--ink-muted);
}
.nav-mobile a:hover { color: var(--ink); }

@media (min-width: 860px) {
  .nav-mobile { display: none; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  padding-top: 74px;
}

.hero-inner { position: relative; }

.eyebrow {
  font-family: var(--font-sans);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.76rem;
  color: var(--ink-faint);
  margin-bottom: 26px;
  font-weight: 600;
}

.hero-title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(2.8rem, 8vw, 5.2rem);
  line-height: 1.02;
  letter-spacing: -0.01em;
  margin-bottom: 28px;
  color: var(--ink);
}

.accent-text {
  font-style: italic;
  color: var(--accent);
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
  color: var(--ink);
  font-weight: 500;
  max-width: 640px;
  margin-bottom: 18px;
  font-family: var(--font-serif);
}

.hero-desc {
  color: var(--ink-muted);
  max-width: 540px;
  font-size: 1.02rem;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 44px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 28px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.92rem;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.btn-primary {
  background: var(--ink);
  color: var(--bg);
  border: 1px solid var(--ink);
}
.btn-primary:hover {
  background: var(--accent);
  border-color: var(--accent);
}
.btn-outline {
  border: 1px solid var(--border);
  color: var(--ink);
}
.btn-outline:hover {
  border-color: var(--ink);
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 0;
}
.hero-links a {
  font-size: 0.88rem;
  color: var(--ink-muted);
  padding: 0 16px;
  border-right: 1px solid var(--border);
  transition: color var(--transition);
}
.hero-links a:last-child { border-right: none; }
.hero-links a:first-child { padding-left: 0; }
.hero-links a:hover { color: var(--accent); }

.scroll-indicator {
  position: absolute;
  bottom: -40px;
  left: 0;
  display: flex;
  align-items: center;
  gap: 12px;
}
.scroll-indicator span {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.scroll-line {
  width: 40px;
  height: 1px;
  background: var(--ink-faint);
}

/* ---------- Sections ---------- */
.section {
  padding: 110px 0;
  position: relative;
  border-top: 1px solid var(--border-soft);
}
.section-alt {
  background: var(--bg-alt);
}

.section-label {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.95rem;
  color: var(--accent);
  margin-bottom: 16px;
}

.section-title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(1.7rem, 3.6vw, 2.4rem);
  letter-spacing: -0.01em;
  margin-bottom: 54px;
  max-width: 640px;
  color: var(--ink);
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 50px;
}
@media (min-width: 780px) {
  .about-grid { grid-template-columns: 1.4fr 1fr; }
}
.about-text .lead {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 22px;
  line-height: 1.45;
}
.about-text p {
  color: var(--ink-muted);
  margin-bottom: 16px;
  font-size: 1.02rem;
}
.about-text strong { color: var(--accent); font-weight: 600; }

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  align-content: start;
  border-top: 1px solid var(--border);
}
@media (max-width: 500px) {
  .about-stats { grid-template-columns: 1fr; }
}
.stat {
  padding: 22px 16px 22px 0;
  border-bottom: 1px solid var(--border);
}
.stat-number {
  display: block;
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 500;
  color: var(--accent);
}
.stat-label {
  display: block;
  font-size: 0.78rem;
  color: var(--ink-faint);
  margin-top: 6px;
}

/* ---------- Skills ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
@media (min-width: 640px) {
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 980px) {
  .skills-grid { grid-template-columns: repeat(3, 1fr); }
}
.skill-card {
  background: var(--surface);
  padding: 30px;
  transition: background var(--transition);
}
.skill-card:hover {
  background: var(--bg-alt);
}
.skill-card h3 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 1.1rem;
  margin-bottom: 16px;
  color: var(--ink);
}
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 0;
}
.tags span {
  font-size: 0.85rem;
  color: var(--ink-muted);
}
.tags span:not(:last-child)::after {
  content: "·";
  margin: 0 8px;
  color: var(--ink-faint);
}

/* ---------- Experience Timeline ---------- */
.timeline {
  position: relative;
  padding-left: 30px;
  border-left: 1px solid var(--border);
}
.timeline-item {
  position: relative;
  padding-bottom: 60px;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-marker {
  position: absolute;
  left: -35px;
  top: 5px;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--bg);
}
.timeline-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  margin-bottom: 6px;
}
.timeline-head h3 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 1.25rem;
  color: var(--ink);
}
.timeline-date {
  font-size: 0.8rem;
  color: var(--ink-faint);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.timeline-org {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 18px;
}
.timeline-content ul li {
  position: relative;
  padding-left: 20px;
  color: var(--ink-muted);
  margin-bottom: 11px;
  font-size: 0.97rem;
}
.timeline-content ul li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--ink-faint);
}

/* ---------- Projects ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
@media (min-width: 700px) {
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
}
.project-card {
  background: var(--surface);
  padding: 34px;
  transition: background var(--transition);
}
.project-card:hover {
  background: var(--bg-alt);
}
.project-tag {
  display: inline-block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  font-weight: 600;
  margin-bottom: 14px;
}
.project-card h3 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 1.35rem;
  margin-bottom: 12px;
  color: var(--ink);
}
.project-card p {
  color: var(--ink-muted);
  font-size: 0.95rem;
  margin-bottom: 20px;
}

/* ---------- Education ---------- */
.education-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
@media (min-width: 600px) {
  .education-grid { grid-template-columns: repeat(2, 1fr); }
}
.education-card {
  background: var(--surface);
  padding: 30px;
  transition: background var(--transition);
}
.education-card:hover {
  background: var(--bg-alt);
}
.edu-year {
  display: block;
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 8px;
  font-size: 0.95rem;
}
.education-card h3 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 1.2rem;
  color: var(--ink);
}

/* ---------- Contact ---------- */
.contact-desc {
  color: var(--ink-muted);
  max-width: 540px;
  margin-bottom: 50px;
  font-size: 1.02rem;
}
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
@media (min-width: 640px) {
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
}
.contact-card {
  background: var(--surface);
  padding: 26px 30px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: background var(--transition);
}
.contact-card:hover {
  background: var(--bg-alt);
}
.contact-label {
  font-size: 0.73rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  font-weight: 600;
}
.contact-value {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--ink);
}
.contact-card:hover .contact-value { color: var(--accent); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 30px 0;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: flex-start;
  font-size: 0.85rem;
  color: var(--ink-faint);
}
@media (min-width: 600px) {
  .footer-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}
.back-to-top {
  color: var(--ink-muted);
  transition: color var(--transition);
}
.back-to-top:hover { color: var(--accent); }