/* ===============================================================
   Prosad Datta — Portfolio
   =============================================================== */

/* ---------- Design tokens ---------- */
:root {
  /* Warm cream theme */
  --bg: #F8F5EE;
  --bg-alt: #F1ECE0;
  --surface: #FFFDF9;
  --surface-2: #FBF6EC;
  --border: rgba(34, 34, 34, 0.10);
  --border-strong: rgba(34, 34, 34, 0.20);
  --text: #222222;
  --muted: #5c5648;
  --muted-2: #8a8171;
  --accent: #C86B2A;      /* burnt orange */
  --accent-2: #5E6B4A;    /* olive */
  --accent-3: #B4923C;    /* warm gold */
  --on-accent: #FFFDF9;   /* text on accent fills */
  --up: #6f8a3a;
  --down: #C24B34;
  --shadow: 0 18px 40px -22px rgba(90, 60, 25, 0.35);
  --radius: 18px;
  --radius-sm: 12px;
  --maxw: 1180px;
  --font: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
}

:root[data-theme="dark"] {
  /* Espresso counterpart of the warm palette */
  --bg: #201B16;
  --bg-alt: #29231C;
  --surface: #2E2820;
  --surface-2: #372F26;
  --border: rgba(255, 245, 230, 0.09);
  --border-strong: rgba(255, 245, 230, 0.18);
  --text: #F4ECDE;
  --muted: #c1b4a0;
  --muted-2: #93876f;
  --accent: #E28B49;
  --accent-2: #9CAB7B;
  --accent-3: #D9B45F;
  --on-accent: #201B16;
  --up: #9BB35E;
  --down: #E0704F;
  --shadow: 0 20px 50px -20px rgba(0, 0, 0, 0.55);
}

/* ---------- Reset / base ---------- */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background .4s ease, color .4s ease;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: clamp(20px, 5vw, 48px); }

/* ---------- Scroll progress ---------- */
.scroll-progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--accent-3));
  z-index: 1000; transition: width .1s linear;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 12px 22px; border-radius: 999px; font-weight: 600; font-size: .95rem;
  transition: transform .2s ease, box-shadow .25s ease, background .25s ease, border-color .25s;
  white-space: nowrap;
}
.btn svg { transition: transform .25s ease; }
.btn:hover { transform: translateY(-2px); }
.btn--primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--on-accent); box-shadow: 0 10px 26px -10px var(--accent);
}
.btn--primary:hover svg { transform: translateX(3px); }
.btn--ghost { border: 1px solid var(--border-strong); color: var(--text); }
.btn--ghost:hover { background: var(--surface); border-color: var(--accent); }
.btn--sm { padding: 8px 16px; font-size: .85rem; }
.btn--full { width: 100%; justify-content: center; margin-top: 6px; }

.icon-btn {
  width: 40px; height: 40px; display: grid; place-items: center; border-radius: 10px;
  border: 1px solid var(--border); color: var(--muted); transition: .25s;
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- Navbar ---------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 900;
  transition: background .3s ease, box-shadow .3s ease, border-color .3s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--border);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 68px; gap: 20px; }
.nav__brand { display: flex; align-items: center; gap: 11px; font-weight: 700; }
.nav__logo {
  display: grid; place-items: center; width: 36px; height: 36px; border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: var(--on-accent);
  font-weight: 800; font-size: .95rem; letter-spacing: .5px;
}
.nav__name { font-size: 1.02rem; }
.nav__links { display: flex; align-items: center; gap: 28px; }
.nav__link { color: var(--muted); font-weight: 500; font-size: .95rem; position: relative; transition: color .2s; }
.nav__link::after {
  content: ""; position: absolute; left: 0; bottom: -6px; height: 2px; width: 0;
  background: var(--accent); transition: width .25s ease;
}
.nav__link:hover, .nav__link.active { color: var(--text); }
.nav__link:hover::after, .nav__link.active::after { width: 100%; }
.nav__actions { display: flex; align-items: center; gap: 10px; }

/* Default (warm light) shows moon → click to go dark; dark shows sun */
.icon-sun { display: none; }
:root[data-theme="dark"] .icon-sun { display: block; }
:root[data-theme="dark"] .icon-moon { display: none; }

.nav__toggle { display: none; flex-direction: column; gap: 5px; width: 40px; height: 40px; align-items: center; justify-content: center; }
.nav__toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: .3s; }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 130px 0 70px; overflow: hidden; }
.hero__grid-bg {
  position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(60% 55% at 78% 12%, color-mix(in srgb, var(--accent-2) 22%, transparent), transparent 70%),
    radial-gradient(50% 50% at 12% 30%, color-mix(in srgb, var(--accent) 16%, transparent), transparent 70%),
    linear-gradient(transparent 0, transparent calc(100% - 1px), var(--border) 100%) 0 0 / 100% 44px,
    linear-gradient(90deg, transparent 0, transparent calc(100% - 1px), var(--border) 100%) 0 0 / 44px 100%;
  mask-image: radial-gradient(120% 90% at 50% 0%, #000 40%, transparent 92%);
}
.hero__inner {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: clamp(30px, 5vw, 64px); align-items: center;
}
.hero__eyebrow {
  display: inline-flex; align-items: center; gap: 9px; font-size: .85rem; font-weight: 600;
  color: var(--muted); background: var(--surface); border: 1px solid var(--border);
  padding: 7px 15px; border-radius: 999px; margin-bottom: 22px;
}
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--up); box-shadow: 0 0 0 0 var(--up); animation: pulse 2s infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--up) 70%, transparent); } 70% { box-shadow: 0 0 0 9px transparent; } 100% { box-shadow: 0 0 0 0 transparent; } }

.hero__title { font-size: clamp(2.1rem, 5.4vw, 3.7rem); line-height: 1.08; font-weight: 800; letter-spacing: -1.5px; margin-bottom: 20px; }
.grad-text { background: linear-gradient(120deg, var(--accent), var(--accent-2) 55%, var(--accent-3)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero__lede { font-size: clamp(1rem, 1.6vw, 1.14rem); color: var(--muted); max-width: 560px; margin-bottom: 30px; }
.hero__lede strong { color: var(--text); }
.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 30px; }
.hero__socials { display: flex; gap: 12px; }
.hero__socials a {
  width: 42px; height: 42px; display: grid; place-items: center; border-radius: 11px;
  border: 1px solid var(--border); color: var(--muted); transition: .25s;
}
.hero__socials a:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-3px); }

/* Hero dashboard panel */
.hero__panel { perspective: 1200px; }
.dashcard {
  background: linear-gradient(160deg, var(--surface), var(--surface-2));
  border: 1px solid var(--border-strong); border-radius: 20px; padding: 20px;
  box-shadow: var(--shadow); transform: rotateY(-8deg) rotateX(4deg); transition: transform .5s ease;
}
.hero__panel:hover .dashcard { transform: rotateY(0) rotateX(0); }
.dashcard__top { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.dashcard__dots { display: flex; gap: 6px; }
.dashcard__dots span { width: 10px; height: 10px; border-radius: 50%; background: var(--border-strong); }
.dashcard__dots span:first-child { background: #ff6058; }
.dashcard__dots span:nth-child(2) { background: #ffbd2e; }
.dashcard__dots span:nth-child(3) { background: #29c941; }
.dashcard__title { font-size: .82rem; color: var(--muted); font-weight: 600; }
.dashcard__kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 16px; }
.mini-kpi { background: var(--bg-alt); border: 1px solid var(--border); border-radius: 12px; padding: 11px 12px; display: flex; flex-direction: column; gap: 2px; }
.mini-kpi__label { font-size: .68rem; color: var(--muted-2); text-transform: uppercase; letter-spacing: .5px; }
.mini-kpi__val { font-size: 1.15rem; font-weight: 800; }
.mini-kpi__delta { font-size: .68rem; font-weight: 600; }
.mini-kpi__delta.up { color: var(--up); }
.mini-kpi__delta.down { color: var(--down); }
.dashcard__chart { background: var(--bg-alt); border: 1px solid var(--border); border-radius: 12px; padding: 8px; margin-bottom: 12px; }
.area-chart { width: 100%; height: 96px; display: block; }
.area-line { stroke-dasharray: 900; stroke-dashoffset: 900; animation: draw 2.4s ease forwards .3s; }
@keyframes draw { to { stroke-dashoffset: 0; } }
.dashcard__bars { display: flex; align-items: flex-end; gap: 7px; height: 60px; }
.dashcard__bars span { flex: 1; height: var(--h); background: linear-gradient(var(--accent-2), var(--accent)); border-radius: 5px 5px 3px 3px; opacity: .85; transform-origin: bottom; animation: grow .8s ease backwards; }
.dashcard__bars span:nth-child(1){animation-delay:.2s}.dashcard__bars span:nth-child(2){animation-delay:.3s}.dashcard__bars span:nth-child(3){animation-delay:.4s}.dashcard__bars span:nth-child(4){animation-delay:.5s}.dashcard__bars span:nth-child(5){animation-delay:.6s}.dashcard__bars span:nth-child(6){animation-delay:.7s}.dashcard__bars span:nth-child(7){animation-delay:.8s}
@keyframes grow { from { transform: scaleY(0); } }

/* ---------- Stats strip ---------- */
.stats { border-block: 1px solid var(--border); background: var(--bg-alt); }
.stats__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; padding-block: 40px; }
.stat { text-align: center; }
.stat__num { display: block; font-size: clamp(1.8rem, 4vw, 2.7rem); font-weight: 800; font-family: var(--mono); background: linear-gradient(120deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; letter-spacing: -1px; }
.stat__label { font-size: .82rem; color: var(--muted); font-weight: 500; }

/* ---------- Sections ---------- */
.section { padding: clamp(64px, 9vw, 110px) 0; }
.section--alt { background: var(--bg-alt); }
.section__kicker { font-family: var(--mono); font-size: .8rem; color: var(--accent); font-weight: 600; letter-spacing: 1px; text-transform: uppercase; margin-bottom: 12px; }
.section__title { font-size: clamp(1.7rem, 3.6vw, 2.6rem); font-weight: 800; letter-spacing: -1px; line-height: 1.15; margin-bottom: 16px; }
.section__lede { color: var(--muted); max-width: 640px; font-size: 1.05rem; margin-bottom: 8px; }

/* ---------- About ---------- */
.about { display: grid; grid-template-columns: 1.4fr 1fr; gap: clamp(28px, 5vw, 56px); align-items: start; }
.about__text { color: var(--muted); margin-bottom: 16px; max-width: 560px; }
.about__facts { display: grid; gap: 12px; margin-top: 26px; }
.about__facts li { display: flex; align-items: center; gap: 12px; font-size: .96rem; color: var(--text); }
.about__facts span { font-size: 1.1rem; }
.focus-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); position: sticky; top: 96px; }
.focus-card h3 { font-size: 1.05rem; margin-bottom: 18px; }
.focus-list { display: grid; gap: 16px; }
.focus-list li { display: flex; flex-direction: column; padding-left: 16px; border-left: 2px solid var(--accent); }
.focus-list strong { font-size: .98rem; }
.focus-list span { font-size: .85rem; color: var(--muted); }

/* ---------- Skills ---------- */
.skills__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; margin-top: 40px; }
.skill-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; transition: transform .3s ease, border-color .3s, box-shadow .3s; }
.skill-card:hover { transform: translateY(-5px); border-color: var(--accent); box-shadow: var(--shadow); }
.skill-card__icon { font-size: 1.8rem; width: 52px; height: 52px; display: grid; place-items: center; border-radius: 14px; background: var(--bg-alt); border: 1px solid var(--border); margin-bottom: 16px; }
.skill-card h3 { font-size: 1.08rem; margin-bottom: 16px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips span { font-size: .8rem; padding: 6px 12px; border-radius: 999px; background: var(--bg-alt); border: 1px solid var(--border); color: var(--muted); font-weight: 500; transition: .2s; }
.skill-card:hover .chips span { border-color: var(--border-strong); }

/* ---------- Projects ---------- */
.projects { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 24px; margin-top: 44px; }
.project { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; transition: transform .3s ease, border-color .3s, box-shadow .3s; }
.project:hover { transform: translateY(-6px); border-color: var(--accent); box-shadow: var(--shadow); }
.project__viz { height: 170px; position: relative; overflow: hidden; border-bottom: 1px solid var(--border); }
.project__viz svg { width: 100%; height: 100%; display: block; }
.project__badge { position: absolute; top: 14px; left: 14px; font-size: .72rem; font-weight: 700; padding: 5px 11px; border-radius: 999px; background: rgba(34, 27, 20, .60); backdrop-filter: blur(6px); color: #FFFDF9; border: 1px solid rgba(255,253,249,.20); }
.project__body { padding: 22px 22px 24px; display: flex; flex-direction: column; flex: 1; }
.project__title { font-size: 1.2rem; font-weight: 700; margin-bottom: 6px; }
.project__tools { display: flex; gap: 7px; flex-wrap: wrap; margin-bottom: 14px; }
.project__tools span { font-size: .72rem; font-family: var(--mono); color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); padding: 3px 9px; border-radius: 6px; }
.project__desc { color: var(--muted); font-size: .93rem; margin-bottom: 16px; }
.project__metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: auto; padding-top: 16px; border-top: 1px solid var(--border); }
.project__metric { display: flex; flex-direction: column; }
.project__metric b { font-size: 1.05rem; font-weight: 800; font-family: var(--mono); color: var(--text); }
.project__metric small { font-size: .68rem; color: var(--muted-2); text-transform: uppercase; letter-spacing: .4px; }

/* ---------- Contact ---------- */
.contact { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(30px, 5vw, 60px); align-items: start; }
.contact__links { display: grid; gap: 12px; margin-top: 26px; }
.contact__row { display: flex; align-items: center; gap: 14px; padding: 14px 16px; border-radius: var(--radius-sm); background: var(--surface); border: 1px solid var(--border); transition: .25s; }
.contact__row:hover { border-color: var(--accent); transform: translateX(4px); }
.contact__ico { font-size: 1.2rem; width: 40px; height: 40px; display: grid; place-items: center; border-radius: 10px; background: var(--bg-alt); }
.contact__row span:last-child { display: flex; flex-direction: column; font-weight: 600; }
.contact__row small { font-size: .72rem; color: var(--muted-2); font-weight: 500; text-transform: uppercase; letter-spacing: .5px; }
.contact__form { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); }
.field { margin-bottom: 16px; display: flex; flex-direction: column; gap: 7px; }
.field label { font-size: .82rem; font-weight: 600; color: var(--muted); }
.field input, .field textarea {
  font-family: inherit; font-size: .95rem; padding: 12px 14px; border-radius: var(--radius-sm);
  background: var(--bg-alt); border: 1px solid var(--border); color: var(--text); resize: vertical; transition: .2s;
}
.field input:focus, .field textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent); }
.hidden-field { display: none; }
.form-note { font-size: .78rem; color: var(--muted-2); text-align: center; margin-top: 12px; }
.form-success { text-align: center; padding: 40px 20px; }
.form-success h3 { font-size: 1.3rem; margin-bottom: 8px; }
.form-success p { color: var(--muted); }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--border); background: var(--bg-alt); padding: 28px 0; }
.footer__inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; color: var(--muted); font-size: .9rem; }
.footer__top { color: var(--accent); font-weight: 600; }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__panel { order: -1; max-width: 420px; }
  .dashcard { transform: none; }
  .about, .contact { grid-template-columns: 1fr; }
  .focus-card { position: static; }
  .stats__grid { grid-template-columns: repeat(2, 1fr); gap: 30px 20px; }

  .nav__links {
    position: fixed; inset: 68px 0 auto 0; flex-direction: column; gap: 8px; align-items: stretch;
    background: var(--bg); border-bottom: 1px solid var(--border); padding: 20px clamp(20px,5vw,48px) 28px;
    transform: translateY(-140%); transition: transform .35s ease; box-shadow: var(--shadow);
  }
  .nav__links.open { transform: translateY(0); }
  .nav__link { padding: 10px 0; font-size: 1rem; }
  .nav__link::after { display: none; }
  .nav__toggle { display: flex; }
  .nav__toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav__toggle.open span:nth-child(2) { opacity: 0; }
  .nav__toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}
@media (max-width: 480px) {
  .stats__grid { grid-template-columns: 1fr 1fr; }
  .project__metrics { grid-template-columns: repeat(3, 1fr); }
  .nav__name { display: none; }
}

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