/* ============================================================
   GLOBAL.CSS — Sanjana Nukala Portfolio
   Shared tokens, components, and utilities
   ============================================================ */

/* ── Google Fonts ────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300..800;1,9..40,300..800&family=Instrument+Serif:ital@0;1&display=swap');

/* ── CSS Variables ───────────────────────────────────────── */
:root {
  /* Colors */
  --bg:          #faf9f7;
  --bg-warm:     #fdf6ee;
  --bg-cool:     #eef4fb;
  --ink:         #111110;
  --ink-mid:     #4a4845;
  --ink-soft:    #8a8680;
  --border:      rgba(17,17,16,0.10);
  --tag-bg:      rgba(17,17,16,0.07);
  --tag-text:    #2c2c2a;

  /* Typography */
  --serif:  'Instrument Serif', Georgia, serif;
  --sans:   'DM Sans', system-ui, sans-serif;

  /* Spacing */
  --section-pad: clamp(60px, 8vw, 120px);
  --page-pad:    40px;
  --radius:      14px;
  --radius-lg:   20px;
  --radius-full: 99px;

  /* Shadows */
  --shadow-sm:  0 2px 12px rgba(0,0,0,0.05);
  --shadow-md:  0 8px 28px rgba(0,0,0,0.07);
  --shadow-lg:  0 20px 60px rgba(0,0,0,0.09);
}

/* ── Reset ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  line-height: 1.5;
}
img  { display: block; max-width: 100%; }
a    { text-decoration: none; color: inherit; }
ul   { list-style: none; }

/* ── Typography ─────────────────────────────────────────── */
.t-serif   { font-family: var(--serif); }
.t-italic  { font-family: var(--serif); font-style: italic; font-weight: 400; }
.t-label   {
  font-size: 11px; font-weight: 700;
  letter-spacing: 0.10em; text-transform: uppercase;
  color: var(--ink-soft);
}
.t-body    { font-size: clamp(15px, 1.3vw, 17px); color: var(--ink-mid); line-height: 1.75; }
.t-large   { font-size: clamp(17px, 1.6vw, 20px); color: var(--ink-mid); line-height: 1.7; }

/* ── Layout ─────────────────────────────────────────────── */
.container  { max-width: 1100px; margin: 0 auto; padding: 0 var(--page-pad); }
.section    { padding: var(--section-pad) 0; border-bottom: 1px solid var(--border); }
.section:last-of-type { border-bottom: none; }
.divider    { border: none; border-top: 1px solid var(--border); }

/* ── NAV ─────────────────────────────────────────────────── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px var(--page-pad);
  background: rgba(250,249,247,0.72);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 600; font-size: 14.5px; letter-spacing: 0.01em;
}
.nav-logo svg { width: 26px; height: 26px; }
.nav-links {
  display: flex; align-items: center; gap: 4px;
  background: white; border: 1px solid var(--border);
  border-radius: var(--radius-full); padding: 5px 8px;
}
.nav-links a {
  font-size: 13.5px; font-weight: 500; padding: 5px 14px;
  border-radius: var(--radius-full); transition: background 0.2s, color 0.2s;
}
.nav-links a.active { background: var(--ink); color: white; }
.nav-links a:hover:not(.active) { background: rgba(0,0,0,0.05); }
.nav-cta {
  background: var(--ink); color: white;
  border-radius: var(--radius-full); padding: 10px 20px;
  font-size: 13.5px; font-weight: 600;
  display: flex; align-items: center; gap: 6px;
  transition: opacity 0.2s;
}
.nav-cta::after { content: "↗"; font-size: 12px; }
.nav-cta:hover  { opacity: 0.8; }

/* ── FOOTER ──────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px var(--page-pad);
  display: flex; justify-content: space-between; align-items: center;
}
.site-footer p { font-size: 13px; color: var(--ink-soft); }

/* Footer case-study prev/next nav */
.footer-nav {
  padding: 60px 0;
  border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
}
.footer-nav-link { display: flex; flex-direction: column; gap: 6px; }
.footer-nav-link.right { text-align: right; }
.footer-nav-link .nav-dir  { font-size: 11px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-soft); }
.footer-nav-link .nav-title { font-size: clamp(16px, 2vw, 22px); font-weight: 800; letter-spacing: -0.025em; transition: opacity 0.2s; }
.footer-nav-link:hover .nav-title { opacity: 0.45; }

/* ── CHIPS & TAGS ────────────────────────────────────────── */
.chip {
  border: 1px solid var(--border); border-radius: var(--radius-full);
  padding: 7px 16px; font-size: 13px; font-weight: 500;
  background: rgba(255,255,255,0.7); display: inline-block;
}
.tag {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--tag-bg); color: var(--tag-text);
  border-radius: var(--radius-full); padding: 6px 14px;
  font-size: 12px; font-weight: 600; letter-spacing: 0.04em;
  text-transform: uppercase;
}
.tag.dot::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%;
  background: #3b82f6; flex-shrink: 0;
}

/* ── CARDS ───────────────────────────────────────────────── */
.card {
  background: white; border: 1px solid var(--border);
  border-radius: 16px; overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.card-body { padding: 24px; }

/* ── CALLOUT ─────────────────────────────────────────────── */
.callout {
  background: linear-gradient(135deg, var(--bg-cool), var(--bg-warm));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  margin: 40px 0;
}
.callout p {
  font-family: var(--serif); font-style: italic;
  font-size: clamp(18px, 2vw, 24px); line-height: 1.55;
}

/* ── BUTTONS ─────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  border-radius: var(--radius-full); padding: 11px 24px;
  font-family: var(--sans); font-size: 14px; font-weight: 600;
  transition: opacity 0.2s, transform 0.15s;
  cursor: pointer;
}
.btn:hover { opacity: 0.85; transform: translateY(-1px); }
.btn-dark  { background: var(--ink); color: white; }
.btn-light { background: white; color: var(--ink); border: 1px solid var(--border); }
.btn::after { content: "↗"; font-size: 11px; }

/* ── SCROLL REVEAL ───────────────────────────────────────── */
.reveal {
  opacity: 0; transform: translateY(22px);
  transition: opacity 0.75s ease, transform 0.75s ease;
}
.reveal.visible { opacity: 1; transform: none; }

/* ── ANIMATIONS ──────────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ── RESUME NAV BUTTON ───────────────────────────────────── */
.nav-links [data-resume-trigger] {
  font-size: 13.5px; font-weight: 500; padding: 5px 14px;
  border-radius: var(--radius-full);
  transition: background 0.2s, color 0.2s;
  background: none; border: none; cursor: pointer;
  color: inherit; font-family: var(--sans);
}
.nav-links [data-resume-trigger]:hover { background: rgba(0,0,0,0.05); }

/* ── RESUME MODAL ────────────────────────────────────────── */
#resume-modal {
  display: none;
  position: fixed; inset: 0; z-index: 1000;
  align-items: center; justify-content: center;
  padding: 24px;
}
#resume-modal.open { display: flex; }
.resume-modal-backdrop {
  position: absolute; inset: 0;
  background: rgba(17,17,16,0.55);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.resume-modal-panel {
  position: relative; z-index: 1;
  background: white; border-radius: 20px;
  width: 100%; max-width: 860px;
  height: 90vh; max-height: 1000px;
  display: flex; flex-direction: column;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  animation: modalSlideUp 0.25s ease;
}
@keyframes modalSlideUp {
  from { opacity: 0; transform: translateY(16px) scale(0.98); }
  to   { opacity: 1; transform: none; }
}
.resume-modal-toolbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  background: white; flex-shrink: 0;
}
.resume-modal-title {
  font-size: 13.5px; font-weight: 600; color: var(--ink);
}
.resume-modal-actions { display: flex; align-items: center; gap: 10px; }
.resume-open-link {
  font-size: 12px; font-weight: 700; color: var(--ink);
  background: var(--tag-bg); border: 1px solid var(--border);
  border-radius: 99px; padding: 5px 14px;
  display: inline-flex; align-items: center; gap: 5px;
  transition: background 0.2s;
}
.resume-open-link::after { content: "↗"; font-size: 10px; }
.resume-open-link:hover { background: var(--border); }
.resume-modal-close {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--tag-bg); border: 1px solid var(--border);
  font-size: 14px; cursor: pointer; color: var(--ink-mid);
  display: flex; align-items: center; justify-content: center;
  transition: background 0.2s, color 0.2s;
}
.resume-modal-close:hover { background: var(--ink); color: white; }
.resume-modal-frame {
  flex: 1; border: none; width: 100%;
  background: #f5f5f3;
}

/* ── NAV HAMBURGER ───────────────────────────────────────── */
.nav-hamburger {
  display: none;
  background: white; border: 1px solid var(--border); cursor: pointer;
  width: 36px; height: 36px;
  align-items: center; justify-content: center;
  border-radius: 8px; padding: 0; flex-shrink: 0;
  color: var(--ink); transition: background 0.2s;
}
.nav-hamburger:hover { background: rgba(0,0,0,0.04); }

/* ── MOBILE NAV MENU ─────────────────────────────────────── */
.nav-mobile-menu {
  display: none;
  position: fixed; top: 65px; left: 0; right: 0; z-index: 99;
  background: var(--bg); border-top: 1px solid var(--border);
  padding: 12px 20px 28px;
  flex-direction: column; gap: 2px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.08);
}
.nav-mobile-menu.open { display: flex; }
.nav-mobile-menu a,
.nav-mobile-menu button {
  display: block; width: 100%; text-align: left;
  font-size: 15px; font-weight: 500; padding: 12px 16px;
  border-radius: var(--radius); border: none; background: none;
  cursor: pointer; color: var(--ink); font-family: var(--sans);
  letter-spacing: 0; transition: background 0.15s;
}
.nav-mobile-menu a:hover,
.nav-mobile-menu button:hover { background: rgba(0,0,0,0.04); }
.nav-mobile-menu a.active { background: var(--ink); color: white; }
.nav-mobile-menu .mobile-cta {
  margin-top: 10px; padding-top: 10px;
  border-top: 1px solid var(--border);
}
.nav-mobile-menu .mobile-cta a {
  display: block; text-align: center;
  background: var(--ink); color: white;
  border-radius: var(--radius-full);
  font-weight: 600; padding: 13px 24px;
}
.nav-mobile-menu .mobile-cta a:hover { opacity: 0.85; background: var(--ink); }

/* ── RESPONSIVE UTILITY GRIDS ────────────────────────────── */
.rg-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.rg-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }

/* ── RESPONSIVE ──────────────────────────────────────────── */
@media (max-width: 900px) {
  :root { --page-pad: 20px; }
  .nav-cta { display: none; }
  .footer-nav { flex-direction: column; gap: 40px; text-align: center; }
  .footer-nav-link.right { text-align: center; }
  .site-footer { flex-direction: column; gap: 10px; text-align: center; }
  .rg-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
}
@media (max-width: 600px) {
  #resume-modal { padding: 12px; }
  .resume-modal-panel { height: 95vh; border-radius: 14px; }
  .rg-3 { grid-template-columns: 1fr; }
  .rg-2 { grid-template-columns: 1fr; }
}