/* ============================================================
   Srishti Nisha — portfolio design system
   Warm cream · charcoal ink · serif display + Inter UI
   ============================================================ */

:root {
  --bg: #fbfaf8;
  --warm: #f6ece2;
  --warm-2: #f9f1e9;
  --surface: #ffffff;
  --ink: #191512;
  --muted: #6b6258;
  --accent: #16233f;
  --accent-hover: #22355c;
  --dark: #17140f;
  --line: #ece6dd;
  --max: 1180px;
  --radius: 18px;
  --shadow: 0 1px 2px rgba(25, 21, 18, 0.04), 0 18px 40px -24px rgba(25, 21, 18, 0.3);

  /* Category colours */
  --c-ai-bg: #efeaff;      --c-ai: #6a4de6;
  --c-startup-bg: #e6f4ec; --c-startup: #2f8f5b;
  --c-research-bg: #e9f2e6;--c-research: #4a8a3f;
  --c-strategy-bg: #e8eefc;--c-strategy: #2f5fd0;
  --c-innov-bg: #e2f1ec;   --c-innov: #1f8f7a;
  --c-gov-bg: #fbeede;     --c-gov: #b5731a;
  --c-neutral-bg: #efece6; --c-neutral: #6b6258;
  --c-growth-bg: #fbead4;  --c-growth: #c96a1f;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

.serif {
  font-family: "Playfair Display", Georgia, "Times New Roman", serif;
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 5vw, 2.75rem);
}

section { padding: clamp(3.5rem, 8vw, 6.5rem) 0; }

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 1.5rem;
  margin-bottom: clamp(2rem, 4vw, 3rem);
}

.section-head .head-inner { max-width: 640px; }

.section-head.center {
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.85rem;
}

h1, h2, h3 { line-height: 1.08; font-weight: 700; }

h2.serif { font-size: clamp(2rem, 4.2vw, 3rem); letter-spacing: -0.01em; font-weight: 700; }

h3 { font-size: 1.25rem; letter-spacing: -0.01em; }

.lead {
  font-size: clamp(1.02rem, 1.4vw, 1.18rem);
  color: var(--muted);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid var(--dark);
  background: var(--dark);
  color: #fff;
  transition: transform 0.15s ease, background 0.2s ease, box-shadow 0.2s ease, color 0.2s ease;
  cursor: pointer;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 14px 26px -16px rgba(23, 20, 15, 0.8); }

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn-ghost:hover { background: rgba(25, 21, 18, 0.04); box-shadow: none; }

.btn-sm { padding: 0.6rem 1.15rem; font-size: 0.88rem; }

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--accent);
  transition: gap 0.2s ease;
}
.text-link:hover { gap: 0.6rem; }

/* ---------- Tags ---------- */
.tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tag {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--muted);
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg);
}

/* Category chip */
.cat {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.32rem 0.6rem;
  border-radius: 7px;
  margin-bottom: 0.85rem;
  align-self: flex-start;
}
.cat-ai       { background: var(--c-ai-bg); color: var(--c-ai); }
.cat-startup  { background: var(--c-startup-bg); color: var(--c-startup); }
.cat-research { background: var(--c-research-bg); color: var(--c-research); }
.cat-strategy { background: var(--c-strategy-bg); color: var(--c-strategy); }
.cat-innov    { background: var(--c-innov-bg); color: var(--c-innov); }
.cat-gov      { background: var(--c-gov-bg); color: var(--c-gov); }
.cat-neutral  { background: var(--c-neutral-bg); color: var(--c-neutral); }
.cat-growth   { background: var(--c-growth-bg); color: var(--c-growth); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(246, 236, 226, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(236, 230, 221, 0.7);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}
.brand {
  font-family: "Playfair Display", Georgia, serif;
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: 0.01em;
}
.site-nav { display: flex; align-items: center; gap: clamp(0.75rem, 1.5vw, 1.5rem); }
.site-nav a {
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--muted);
  transition: color 0.2s ease;
}
.site-nav a:hover, .site-nav a.active { color: var(--ink); }
.site-nav a.active { position: relative; }
.site-nav a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
}
.site-nav .btn { color: #fff; }
.site-nav .btn:hover { color: #fff; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none; border: none; cursor: pointer; padding: 6px;
}
.nav-toggle span { width: 24px; height: 2px; background: var(--ink); transition: 0.3s ease; }

/* ---------- Hero ---------- */
.hero-wrap {
  background:
    radial-gradient(1100px 520px at 68% 8%, var(--warm-2), transparent 60%),
    linear-gradient(180deg, var(--warm) 0%, var(--warm) 72%, var(--bg) 100%);
}
.hero { padding: clamp(2.5rem, 5vw, 4.5rem) 0 clamp(3rem, 5vw, 4rem); }
.hero-grid {
  display: grid;
  grid-template-columns: 0.92fr 1.08fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}
.hero-photo {
  aspect-ratio: 4 / 5;
  border-radius: var(--radius);
  background: #d8d2ca url("srishti-hero.png") center / cover no-repeat;
  box-shadow: var(--shadow);
}
.hero h1 {
  font-family: "Playfair Display", Georgia, serif;
  font-size: clamp(3.2rem, 8vw, 6rem);
  font-weight: 700;
  letter-spacing: -0.01em;
}
.hero-sub {
  font-size: clamp(0.82rem, 1.2vw, 0.95rem);
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.1rem;
}
.hero-lead {
  margin-top: 1.5rem;
  font-size: clamp(1.15rem, 1.9vw, 1.5rem);
  font-weight: 500;
  color: var(--ink);
  max-width: 30ch;
  line-height: 1.3;
}
.hero-body {
  margin-top: 1.15rem;
  color: var(--muted);
  max-width: 48ch;
}
.hero-actions {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  align-items: center;
}

/* ---------- Credibility card ---------- */
.cred-wrap { background: var(--bg); }
.cred-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-top: -2.5rem;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
}
.cred-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1.1rem 1.15rem;
  border-right: 1px solid var(--line);
}
.cred-item:last-child { border-right: none; }
.cred-ico {
  flex-shrink: 0;
  width: 34px; height: 34px;
  display: grid; place-items: center;
  border-radius: 9px;
  background: var(--warm);
  color: var(--accent);
}
.cred-ico svg { width: 18px; height: 18px; }
.cred-item b { display: block; font-size: 0.86rem; font-weight: 700; line-height: 1.25; }
.cred-item small { display: block; font-size: 0.76rem; color: var(--muted); }

/* ---------- Grids / cards ---------- */
.grid { display: grid; gap: 1.5rem; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.work-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 1px 2px rgba(25,21,18,0.05), 0 28px 50px -26px rgba(25,21,18,0.45);
}
.thumb {
  display: block;
  aspect-ratio: 16 / 10;
  background: linear-gradient(135deg, var(--warm-2), var(--warm));
}
.thumb.cat-ai       { background: linear-gradient(135deg, #efeaff, #dcd2fb); }
.thumb.cat-startup  { background: linear-gradient(135deg, #e9f6ef, #cfeadb); }
.thumb.cat-research { background: linear-gradient(135deg, #eaf4e6, #d3e9c9); }
.thumb.cat-strategy { background: linear-gradient(135deg, #e9eefc, #cfdcf7); }
.thumb.cat-innov    { background: linear-gradient(135deg, #e4f2ee, #cbe8df); }
.thumb.cat-gov      { background: linear-gradient(135deg, #fbeede, #f4dcbb); }
.thumb.cat-growth   { background: linear-gradient(135deg, #fbead4, #f3d3a3); }

/* Themed abstract artwork per project (covers the base gradient) */
.thumb.art { background-size: cover; background-position: center; background-repeat: no-repeat; }
.thumb.p-ai         { background-image: url("assets/thumbs/ai-orchestrator.svg"); }
.thumb.p-vanity     { background-image: url("assets/thumbs/vanity-pass.svg"); }
.thumb.p-bio        { background-image: url("assets/thumbs/biofortification.svg"); }
.thumb.p-greggs     { background-image: url("assets/thumbs/greggs.svg"); }
.thumb.p-fairphone  { background-image: url("assets/thumbs/fairphone.svg"); }
.thumb.p-hiring     { background-image: url("assets/thumbs/ai-hiring.svg"); }
.thumb.p-career     { background-image: url("assets/thumbs/career.svg"); }
.thumb.p-handyman   { background-image: url("assets/thumbs/simple-handyman.svg"); }

.work-body { padding: 1.4rem 1.5rem 1.5rem; display: flex; flex-direction: column; flex: 1; }
.work-body .tags { margin-bottom: 1.15rem; }
.work-card h3 { margin-bottom: 0.55rem; }
.work-card p { color: var(--muted); font-size: 0.95rem; margin-bottom: 1.1rem; }
.work-card .card-actions {
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.2rem;
  align-items: center;
}

/* Capability cards */
.cap-card { padding: 1.6rem; }
.cap-card h3 { margin-bottom: 0.7rem; }
.cap-card p { color: var(--ink); font-size: 0.96rem; margin-bottom: 1.1rem; }
.cap-card .skills {
  margin-top: auto;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--muted);
  line-height: 1.5;
}

/* CV section (portrait + panel) */
.cv-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  align-items: stretch;
}
.cv-photo {
  border-radius: calc(var(--radius) + 6px);
  background: #cbb6c6 url("srishti-inside.png") center 45% / cover no-repeat;
  min-height: 360px;
  box-shadow: var(--shadow);
}

/* Publication cards */
.pub-card { padding: 1.6rem; }
.pub-meta {
  display: flex; align-items: center; gap: 0.6rem;
  margin-bottom: 0.85rem;
  font-size: 0.74rem; font-weight: 700; color: var(--accent);
  letter-spacing: 0.06em; text-transform: uppercase;
}
.pub-card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.pub-card p { color: var(--muted); font-size: 0.93rem; margin-bottom: 1rem; }

/* ---------- Writing (coming soon) ---------- */
.soon-note { font-size: 1.1rem; color: var(--muted); margin-bottom: 1.75rem; }
.soon-list { list-style: none; display: grid; gap: 0.75rem; max-width: 760px; }
.soon-list li {
  display: flex; align-items: baseline; gap: 0.75rem;
  padding: 0.9rem 1.1rem;
  border: 1px dashed var(--line);
  border-radius: 12px;
  color: var(--muted);
  background: var(--surface);
}
.soon-list li::before {
  content: "Soon";
  font-size: 0.66rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 0.15rem 0.5rem; flex-shrink: 0;
}

/* ---------- Panels (CV + contact) ---------- */
.panel {
  background: var(--dark);
  color: #fff;
  border-radius: calc(var(--radius) + 6px);
  padding: clamp(2.25rem, 5vw, 3.75rem);
}
.panel h2 { color: #fff; }
.panel p { color: rgba(255,255,255,0.75); max-width: 54ch; margin-top: 1rem; }
.panel .btn { background: #fff; color: var(--dark); border-color: #fff; margin-top: 1.75rem; }
.panel .btn:hover { background: rgba(255,255,255,0.88); }
.contact-links { display: flex; flex-wrap: wrap; gap: 1rem 2rem; margin-top: 1.75rem; }
.contact-links a {
  color: #fff; font-weight: 600;
  border-bottom: 1px solid rgba(255,255,255,0.4);
  transition: border-color 0.2s ease;
}
.contact-links a:hover { border-color: #fff; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 2.5rem 0; }
.site-footer .container {
  display: flex; flex-wrap: wrap; justify-content: space-between;
  gap: 1rem; align-items: center;
  color: var(--muted); font-size: 0.9rem;
}
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--ink); }

/* ---------- Case-study pages ---------- */
.case-hero {
  background: linear-gradient(180deg, var(--warm) 0%, var(--bg) 100%);
  padding-top: clamp(2.5rem, 6vw, 4rem);
  padding-bottom: clamp(2rem, 4vw, 3rem);
  border-bottom: 1px solid var(--line);
}
.back-link {
  font-size: 0.9rem; font-weight: 600; color: var(--muted);
  display: inline-flex; gap: 0.4rem; margin-bottom: 1.75rem;
}
.back-link:hover { color: var(--ink); }
.case-hero h1 {
  font-family: "Playfair Display", Georgia, serif;
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 700; max-width: 18ch;
}
.case-hero .summary {
  margin-top: 1.25rem;
  font-size: clamp(1.08rem, 1.7vw, 1.3rem);
  color: var(--muted); max-width: 60ch;
}
.case-hero .tags { margin-top: 1.75rem; }
.case-body { padding-top: clamp(2.5rem, 6vw, 4rem); }
.case-body .container { max-width: 760px; }
.case-block { margin-bottom: clamp(2.25rem, 4vw, 3.25rem); }
.case-block h2 { font-size: 1.4rem; font-weight: 700; margin-bottom: 1rem; }
.case-block p { color: var(--ink); margin-bottom: 1rem; }
.case-block ul { padding-left: 1.2rem; color: var(--ink); }
.case-block li { margin-bottom: 0.6rem; }
.evidence-list { list-style: none; padding: 0; display: grid; gap: 0.75rem; }
.evidence-list li { margin: 0; }
.evidence-list a {
  display: flex; align-items: center; gap: 0.6rem;
  padding: 0.9rem 1.1rem;
  border: 1px solid var(--line); border-radius: 12px;
  background: var(--surface); font-weight: 500; color: var(--accent);
  word-break: break-word;
  transition: border-color 0.2s ease, transform 0.15s ease;
}
.evidence-list a:hover { border-color: var(--accent); transform: translateX(3px); }
.placeholder-note {
  padding: 0.9rem 1.1rem;
  border: 1px dashed var(--line); border-radius: 12px;
  color: var(--muted); font-size: 0.92rem;
}
.case-nav {
  border-top: 1px solid var(--line);
  padding: 2.5rem 0;
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
}
.case-nav a { font-weight: 600; color: var(--accent); }

/* ---------- Scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1000px) {
  .cred-card { grid-template-columns: repeat(3, 1fr); }
  .cred-item:nth-child(3) { border-right: none; }
  .cred-item:nth-child(n+4) { border-top: 1px solid var(--line); }
}
@media (max-width: 900px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-photo { order: -1; max-width: 440px; width: 100%; }
  .section-head { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 780px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: absolute; top: 74px; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: var(--warm);
    border-bottom: 1px solid var(--line);
    padding: 0.5rem 0;
    transform: translateY(-8px); opacity: 0; visibility: hidden;
    transition: 0.25s ease;
  }
  .site-nav.open { transform: translateY(0); opacity: 1; visibility: visible; }
  .site-nav a { width: 100%; padding: 0.85rem clamp(1.25rem, 5vw, 2.75rem); }
  .site-nav a.active::after { display: none; }
  .site-nav .btn { margin: 0.5rem clamp(1.25rem, 5vw, 2.75rem); }
}
@media (max-width: 780px) {
  .cv-grid { grid-template-columns: 1fr; }
  .cv-photo { min-height: 420px; order: -1; }
}
@media (max-width: 620px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .cred-card { grid-template-columns: repeat(2, 1fr); }
  .cred-item:nth-child(odd) { border-right: 1px solid var(--line); }
  .cred-item:nth-child(even) { border-right: none; }
}