/* ==========================================================================
   Faiz Ahmad Taiyeb — portfolio site
   ========================================================================== */

:root {
  --ink: #12171F;
  --ink-soft: #3A4250;
  --paper: #FBF8F2;
  --paper-alt: #F1ECE0;
  --line: #E3DCCB;
  --accent: #9C7A3C;
  --accent-strong: #7A5E2C;

  /* Fixed "dark band" palette for .section-inverted — intentionally does
     NOT change with prefers-color-scheme, since these sections are meant
     to stay a constant dark-navy accent band regardless of site theme. */
  --band-bg: #12171F;
  --band-ink: #F1ECE0;
  --band-ink-soft: #B9C0CC;
  --band-accent: #C6A15B;

  --serif: "Fraunces", "Source Serif 4", Georgia, serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --bn-serif: "Noto Serif Bengali", var(--serif);
  --bn-sans: "Noto Sans Bengali", var(--sans);

  --max: 1120px;
  --radius: 6px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #EDEAE3;
    --ink-soft: #B9C0CC;
    --paper: #0B0F16;
    --paper-alt: #11161F;
    --line: #232B38;
    --accent: #C6A15B;
    --accent-strong: #DABB7C;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

html[lang="bn"] body { font-family: var(--bn-sans); }
html[lang="bn"] h1, html[lang="bn"] h2, html[lang="bn"] h3 { font-family: var(--bn-serif); }
[lang="bn"] { font-family: var(--bn-sans); }
h3[lang="bn"], .book h3[lang="bn"] { font-family: var(--bn-serif); }

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 500;
  line-height: 1.15;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}

p { margin: 0 0 1em; }
a { color: inherit; }

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 12px 20px;
  z-index: 1000;
  border-radius: 0 0 var(--radius) 0;
}
.skip-link:focus { left: 0; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 24px;
}
.brand {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--ink);
  white-space: nowrap;
}
.main-nav {
  display: flex;
  gap: 28px;
  flex: 1;
  justify-content: center;
}
.main-nav a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 0.94rem;
  font-weight: 500;
  transition: color 0.15s ease;
}
.main-nav a:hover, .main-nav a:focus-visible { color: var(--accent-strong); }

.header-tools { display: flex; align-items: center; gap: 14px; }

.lang-switch {
  display: flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
}
.lang-btn {
  border: none;
  background: transparent;
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 6px 12px;
  cursor: pointer;
  letter-spacing: 0.02em;
}
.lang-btn.is-active { background: var(--ink); color: var(--paper); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 34px;
  height: 34px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
}

@media (max-width: 860px) {
  .main-nav {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 24px 16px;
    display: none;
  }
  .main-nav.is-open { display: flex; }
  .main-nav a { padding: 10px 0; width: 100%; }
  .nav-toggle { display: flex; width: 44px; height: 44px; }
  .lang-btn { padding: 10px 14px; font-size: 0.82rem; }
}

/* ---------- Sections (shared) ---------- */
.section { padding: 96px 0; scroll-margin-top: 68px; }
#top { scroll-margin-top: 68px; }
.section-inverted {
  background: var(--band-bg);
  color: var(--band-ink);
}
.section-inverted .eyebrow { color: var(--band-accent); }
.section-inverted h2 { color: var(--band-ink); }
.section-inverted .section-sub,
.section-inverted .section-intro { color: var(--band-ink-soft); }

.eyebrow {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-strong);
  margin: 0 0 0.75em;
}
.section h2 { font-size: clamp(1.6rem, 3vw, 2.1rem); }
.section-sub {
  font-size: 1.05rem;
  color: var(--ink-soft);
  margin-top: -0.4em;
}
.section-intro {
  max-width: 68ch;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- Hero ---------- */
.hero { padding: 72px 0 88px; }
.hero-inner {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 56px;
  align-items: center;
}
.hero h1 {
  font-size: clamp(2.1rem, 4.4vw, 3.4rem);
  margin-bottom: 0.3em;
  display: flex;
  flex-direction: column;
}
.name-native {
  font-family: var(--bn-serif);
  font-size: 0.42em;
  font-weight: 500;
  color: var(--ink-soft);
  margin-top: 0.25em;
}
.tagline {
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--accent-strong);
  max-width: 46ch;
}
.hero-intro {
  font-size: 1.05rem;
  color: var(--ink-soft);
  max-width: 56ch;
}
.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 1.6em;
  flex-wrap: wrap;
}

.hero-media { display: flex; justify-content: center; align-items: flex-start; }
.portrait {
  display: block;
  width: 100%;
  max-width: 360px;
  height: auto;
  aspect-ratio: 800 / 882;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: 0 24px 48px -20px rgba(18, 23, 31, 0.35);
}

@media (max-width: 860px) {
  .hero-inner { grid-template-columns: 1fr; text-align: left; }
  .hero-media { order: -1; max-width: 260px; margin: 0 auto 8px; }
}

@media (max-width: 640px) {
  .hero { padding: 40px 0 56px; }
  .hero-inner { text-align: center; gap: 20px; }
  .hero-text { display: flex; flex-direction: column; align-items: center; }
  .hero h1 { align-items: center; }
  .tagline, .hero-intro { max-width: 40ch; }
  .hero-actions { justify-content: center; margin-top: 1.2em; }

  /* Small circular avatar instead of a full hero portrait, so name,
     tagline, and CTAs are visible without scrolling on phones. */
  .hero-media { max-width: 116px; margin: 0 auto; }
  .portrait {
    aspect-ratio: 1 / 1;
    border-radius: 50%;
    object-position: top center;
    box-shadow: 0 10px 24px -10px rgba(18, 23, 31, 0.35);
  }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--ink); color: var(--paper); }
.section-inverted .btn-primary { background: var(--band-accent); color: var(--band-bg); }
.btn-ghost { border-color: var(--line); color: var(--ink); }
.section-inverted .btn-ghost { border-color: var(--band-ink-soft); color: var(--band-ink); }

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 56px;
  margin-top: 40px;
  align-items: start;
}
.about-copy p:first-child { font-size: 1.1rem; }
.stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin: 0;
  padding: 28px;
  background: var(--paper-alt);
  border-radius: var(--radius);
  border: 1px solid var(--line);
}
.stat dt {
  font-family: var(--serif);
  font-size: 2rem;
  color: var(--accent-strong);
  font-weight: 600;
}
.stat dd {
  margin: 4px 0 0;
  font-size: 0.86rem;
  color: var(--ink-soft);
  line-height: 1.4;
}

@media (max-width: 860px) {
  .about-grid { grid-template-columns: 1fr; gap: 32px; }
}

/* ---------- Public Service cards ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 44px 0 32px;
}
.card {
  background: rgba(241, 236, 224, 0.04);
  border: 1px solid var(--band-ink-soft);
  border-color: color-mix(in srgb, var(--band-ink-soft) 30%, transparent);
  border-radius: var(--radius);
  padding: 26px;
}
.section-inverted .card h3 { color: var(--band-accent); font-size: 1.05rem; }
.card p { color: var(--band-ink-soft); font-size: 0.94rem; margin-bottom: 0; }

.badge {
  font-size: 0.9rem;
  color: var(--band-ink-soft);
  border-top: 1px solid color-mix(in srgb, var(--band-ink-soft) 30%, transparent);
  padding-top: 20px;
  margin-top: 8px;
}

@media (max-width: 960px) {
  .card-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .card-grid { grid-template-columns: 1fr; }
}

/* ---------- Career timeline ---------- */
.timeline {
  list-style: none;
  margin: 44px 0 0;
  padding: 0;
  border-left: 2px solid var(--line);
}
.timeline li {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 24px;
  padding: 0 0 36px 28px;
  position: relative;
}
.timeline li::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--paper);
}
.tl-date {
  font-family: var(--serif);
  font-weight: 600;
  color: var(--accent-strong);
  white-space: nowrap;
  font-size: 0.95rem;
}
.tl-body h3 {
  font-size: 1.1rem;
  margin-bottom: 0.3em;
}
.tl-role {
  display: block;
  font-family: var(--sans);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--ink-soft);
  margin-top: 2px;
}
.tl-body p { color: var(--ink-soft); font-size: 0.95rem; margin-bottom: 0; }

@media (max-width: 640px) {
  .timeline li { grid-template-columns: 1fr; gap: 4px; }
  .tl-date { font-size: 0.85rem; }
}

.education { margin-top: 48px; padding-top: 32px; border-top: 1px solid var(--line); }
.education h3 { font-size: 1.1rem; }
.education ul { padding-left: 1.2em; color: var(--ink-soft); }
.education li { margin-bottom: 0.4em; }

/* ---------- Books ---------- */
.book-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin: 44px 0 56px;
}
.book {
  padding: 24px;
  border: 1px solid color-mix(in srgb, var(--band-ink-soft) 30%, transparent);
  border-radius: var(--radius);
}
.book h3 {
  font-size: 1.05rem;
  color: var(--band-ink);
  margin-bottom: 0.35em;
}
.book-en {
  font-style: italic;
  color: var(--band-ink-soft);
  font-size: 0.88rem;
  margin-bottom: 0.6em;
}
.book-year {
  font-size: 0.8rem;
  color: var(--band-accent);
  font-weight: 600;
  margin: 0;
}

.columns-heading {
  font-size: 1.2rem;
  margin-top: 8px;
}
.column-list {
  list-style: none;
  margin: 20px 0 32px;
  padding: 0;
  display: grid;
  gap: 14px;
}
.column-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 14px;
  border-bottom: 1px solid color-mix(in srgb, var(--band-ink-soft) 25%, transparent);
}
.column-list a {
  color: var(--band-ink);
  text-decoration: none;
  font-weight: 500;
  border-bottom: 1px solid transparent;
}
.column-list a:hover { border-bottom-color: var(--band-accent); }
.column-meta {
  color: var(--band-ink-soft);
  font-size: 0.85rem;
  white-space: nowrap;
}

.more-writing {
  color: var(--band-ink-soft);
  font-size: 0.95rem;
}
.more-writing a { color: var(--band-accent); text-decoration: none; font-weight: 600; }
.more-writing a:hover { text-decoration: underline; }

@media (max-width: 960px) {
  .book-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .book-grid { grid-template-columns: 1fr; }
}

/* ---------- Contact ---------- */
.contact-wrap { text-align: left; }
.contact-links {
  display: flex;
  gap: 14px;
  margin: 28px 0 20px;
  flex-wrap: wrap;
}
.location {
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 32px 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--ink-soft);
}
.footer-inner p { margin: 0; }
.footer-meta a { color: var(--ink-soft); text-decoration: underline; }