/* ============================================================
   Deepak Gupta — Portfolio
   Design tokens, layout, and components. Light + dark themes.
   ============================================================ */

:root {
  /* Dark theme (default) */
  --bg: #0b0d10;
  --bg-alt: #101318;
  --surface: #151a21;
  --surface-2: #1b222b;
  --border: #232b36;
  --text: #e7ecf2;
  --text-dim: #9aa6b4;
  --text-faint: #61707f;
  --accent: #5eead4;      /* teal */
  --accent-2: #7c9cff;     /* periwinkle */
  --accent-soft: rgba(94, 234, 212, 0.12);
  --grad: linear-gradient(120deg, #5eead4 0%, #7c9cff 100%);
  --shadow: 0 20px 50px -20px rgba(0, 0, 0, 0.6);

  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  --maxw: 1120px;
  --radius: 16px;
  --radius-sm: 10px;
}

[data-theme="light"] {
  --bg: #f7f8fa;
  --bg-alt: #eef1f5;
  --surface: #ffffff;
  --surface-2: #f1f4f8;
  --border: #e2e7ee;
  --text: #10151c;
  --text-dim: #4c5866;
  --text-faint: #8b97a6;
  --accent: #0f9d8b;
  --accent-2: #4b6bff;
  --accent-soft: rgba(15, 157, 139, 0.10);
  --grad: linear-gradient(120deg, #0f9d8b 0%, #4b6bff 100%);
  --shadow: 0 20px 50px -24px rgba(20, 30, 50, 0.22);
}

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

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

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background 0.4s ease, color 0.4s ease;
}

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

a { color: inherit; text-decoration: none; }

/* ---------- Scroll progress ---------- */
.scroll-progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0%;
  background: var(--grad); z-index: 1000; transition: width 0.1s linear;
}

/* ---------- Nav ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 900;
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, background 0.3s ease;
}
.nav.scrolled { border-bottom-color: var(--border); }
.nav__inner {
  max-width: var(--maxw); margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav__logo { font-family: var(--font-display); font-weight: 700; font-size: 1.3rem; letter-spacing: -0.02em; }
.nav__logo span { color: var(--accent); }
.nav__links { display: flex; gap: 28px; }
.nav__links a {
  font-size: 0.92rem; color: var(--text-dim); font-weight: 500;
  position: relative; transition: color 0.2s ease;
}
.nav__links a::after {
  content: ""; position: absolute; left: 0; bottom: -4px; height: 2px; width: 0;
  background: var(--grad); transition: width 0.25s ease;
}
.nav__links a:hover { color: var(--text); }
.nav__links a:hover::after { width: 100%; }
.nav__actions { display: flex; align-items: center; gap: 12px; }
.theme-toggle {
  width: 38px; height: 38px; border-radius: 50%; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); cursor: pointer; font-size: 1.05rem;
  display: grid; place-items: center; transition: transform 0.3s ease, border-color 0.2s ease;
}
.theme-toggle:hover { transform: rotate(180deg); border-color: var(--accent); }
.nav__burger { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.nav__burger span { width: 24px; height: 2px; background: var(--text); transition: 0.3s ease; }
.nav__burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger.open span:nth-child(2) { opacity: 0; }
.nav__burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; padding: 120px 0 60px; overflow: hidden; }
.hero__bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(600px 400px at 78% 25%, var(--accent-soft), transparent 70%),
    radial-gradient(500px 380px at 12% 78%, color-mix(in srgb, var(--accent-2) 14%, transparent), transparent 70%);
}
.hero__bg::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 54px 54px; opacity: 0.25;
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 75%);
          mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 75%);
}
.hero__inner {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1.35fr 0.9fr; gap: 56px; align-items: center;
}
.hero__eyebrow {
  display: inline-flex; align-items: center; gap: 8px; font-family: var(--font-mono);
  font-size: 0.8rem; color: var(--text-dim); border: 1px solid var(--border);
  padding: 6px 14px; border-radius: 999px; background: var(--surface); margin-bottom: 24px;
}
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 0 var(--accent); animation: pulse 2s infinite; }
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 60%, transparent); }
  70% { box-shadow: 0 0 0 8px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}
.hero__title {
  font-family: var(--font-display); font-weight: 700; letter-spacing: -0.03em;
  font-size: clamp(2.8rem, 7vw, 5rem); line-height: 1.02; margin-bottom: 10px;
}
.grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero__role { font-family: var(--font-mono); color: var(--accent); font-size: 1rem; margin-bottom: 22px; }
.hero__lede { color: var(--text-dim); font-size: 1.08rem; max-width: 540px; margin-bottom: 32px; }
.hero__lede strong { color: var(--text); font-weight: 600; }
.hero__cta { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 26px; }
.hero__socials { display: flex; align-items: center; gap: 12px; font-family: var(--font-mono); font-size: 0.88rem; color: var(--text-faint); }
.hero__socials a { color: var(--text-dim); transition: color 0.2s ease; }
.hero__socials a:hover { color: var(--accent); }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 13px 26px; border-radius: 999px; font-weight: 600; font-size: 0.95rem; cursor: pointer; border: 1px solid transparent; transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease; }
.btn--primary { background: var(--grad); color: #06121a; box-shadow: 0 10px 30px -10px color-mix(in srgb, var(--accent) 55%, transparent); }
.btn--primary:hover { transform: translateY(-3px); box-shadow: 0 16px 36px -12px color-mix(in srgb, var(--accent) 65%, transparent); }
.btn--ghost { background: transparent; border-color: var(--border); color: var(--text); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-3px); }
.btn--lg { padding: 16px 34px; font-size: 1.05rem; font-family: var(--font-mono); }

/* Hero photo */
.hero__photo { position: relative; justify-self: center; }
.hero__photo-frame {
  position: relative; width: 300px; height: 380px; border-radius: 24px; overflow: hidden;
  border: 1px solid var(--border); box-shadow: var(--shadow);
}
.hero__photo-frame::after {
  content: ""; position: absolute; inset: 0; border-radius: 24px;
  background: linear-gradient(180deg, transparent 55%, color-mix(in srgb, var(--accent) 22%, transparent));
  mix-blend-mode: overlay;
}
.hero__photo-frame img { width: 100%; height: 100%; object-fit: cover; object-position: center 20%; filter: grayscale(1) contrast(1.05); transition: filter 0.4s ease, transform 0.5s ease; }
.hero__photo-frame:hover img { filter: grayscale(0) contrast(1); transform: scale(1.04); }
.hero__badge {
  position: absolute; bottom: -18px; left: -22px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 12px 16px;
  box-shadow: var(--shadow); display: flex; flex-direction: column;
}
.hero__badge-k { font-family: var(--font-display); font-weight: 700; font-size: 1.3rem; color: var(--accent); }
.hero__badge-l { font-size: 0.72rem; color: var(--text-dim); }
.hero__scroll { position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%); color: var(--text-faint); font-size: 1.3rem; animation: bob 1.8s ease-in-out infinite; }
@keyframes bob { 0%,100% { transform: translate(-50%, 0); } 50% { transform: translate(-50%, 8px); } }

/* ---------- Stats ---------- */
.stats { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: var(--bg-alt); }
.stats__grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat { padding: 34px 20px; text-align: center; border-right: 1px solid var(--border); }
.stat:last-child { border-right: none; }
.stat__num, .stat__num-text { font-family: var(--font-display); font-weight: 700; font-size: 2.4rem; background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; display: block; }
.stat__num::after { content: "+"; }
.stat__num--exact::after { content: none; }
.stat__label { color: var(--text-dim); font-size: 0.85rem; }

/* ---------- Sections ---------- */
.section { padding: 100px 0; }
.section--alt { background: var(--bg-alt); }
.section__head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 48px; }
.section__index { font-family: var(--font-mono); color: var(--accent); font-size: 1rem; }
.section__title { font-family: var(--font-display); font-weight: 700; font-size: clamp(1.8rem, 4vw, 2.6rem); letter-spacing: -0.02em; position: relative; }
.section__title::after { content: ""; display: inline-block; margin-left: 16px; width: 60px; height: 1px; background: var(--border); vertical-align: middle; }

/* ---------- About ---------- */
.about { display: grid; grid-template-columns: 1.6fr 1fr; gap: 48px; align-items: start; }
.about__body p { color: var(--text-dim); margin-bottom: 18px; font-size: 1.05rem; }
.about__body strong { color: var(--text); font-weight: 600; }
.about__facts { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 24px; margin-top: 26px; }
.about__facts > div { display: flex; flex-direction: column; border-left: 2px solid var(--accent); padding-left: 14px; }
.about__facts .k { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-faint); }
.about__facts .v { font-weight: 600; }
.about__awards { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); }
.about__awards h3 { font-family: var(--font-display); margin-bottom: 20px; font-size: 1.1rem; }
.award { display: flex; gap: 14px; margin-bottom: 20px; }
.award:last-child { margin-bottom: 0; }
.award__icon { color: var(--accent); font-size: 1.2rem; line-height: 1.4; }
.award__title { font-weight: 600; margin-bottom: 2px; }
.award__desc { color: var(--text-dim); font-size: 0.9rem; }

/* ---------- Timeline ---------- */
.timeline { position: relative; padding-left: 8px; }
.timeline::before { content: ""; position: absolute; left: 7px; top: 8px; bottom: 8px; width: 2px; background: var(--border); }
.tl { position: relative; padding-left: 40px; padding-bottom: 44px; }
.tl:last-child { padding-bottom: 0; }
.tl__marker { position: absolute; left: 0; top: 6px; width: 16px; height: 16px; border-radius: 50%; background: var(--bg-alt); border: 3px solid var(--accent); box-shadow: 0 0 0 4px var(--bg-alt); }
.section:not(.section--alt) .tl__marker { background: var(--bg); box-shadow: 0 0 0 4px var(--bg); }
.tl__content { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px 26px; transition: transform 0.25s ease, border-color 0.25s ease; }
.tl__content:hover { transform: translateX(4px); border-color: color-mix(in srgb, var(--accent) 45%, var(--border)); }
.tl__top { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; flex-wrap: wrap; }
.tl__top h3 { font-family: var(--font-display); font-size: 1.25rem; }
.tl__sub { font-family: var(--font-body); font-weight: 400; font-size: 0.85rem; color: var(--text-faint); }
.tl__date { font-family: var(--font-mono); font-size: 0.82rem; color: var(--accent); white-space: nowrap; }
.tl__meta { color: var(--text-dim); font-size: 0.9rem; margin: 4px 0 16px; }
.tl__list { list-style: none; display: flex; flex-direction: column; gap: 10px; margin-bottom: 18px; }
.tl__list li { position: relative; padding-left: 20px; color: var(--text-dim); font-size: 0.98rem; }
.tl__list li::before { content: "▹"; position: absolute; left: 0; color: var(--accent); }
.tl__list strong { color: var(--text); font-weight: 600; }
.tl__tags { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; }
.tl__tags li { font-family: var(--font-mono); font-size: 0.74rem; padding: 4px 10px; border-radius: 6px; background: var(--accent-soft); color: var(--accent); }
.tl__link { display: inline-block; margin-top: 14px; font-family: var(--font-mono); font-size: 0.82rem; color: var(--accent-2); }
.tl__link:hover { text-decoration: underline; }

/* ---------- Skills ---------- */
.skills { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 18px; }
.skill-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; transition: transform 0.25s ease, border-color 0.25s ease; }
.skill-card:hover { transform: translateY(-5px); border-color: color-mix(in srgb, var(--accent) 45%, var(--border)); }
.skill-card h3 { font-family: var(--font-display); font-size: 1.05rem; margin-bottom: 14px; padding-bottom: 12px; border-bottom: 1px solid var(--border); }
.skill-card ul { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; }
.skill-card li { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-dim); background: var(--surface-2); padding: 5px 11px; border-radius: 6px; border: 1px solid var(--border); transition: color 0.2s ease, border-color 0.2s ease; }
.skill-card li:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- Projects ---------- */
.projects { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 400px)); gap: 22px; justify-content: center; }
.project { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; display: flex; flex-direction: column; transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease; }
.project:hover { transform: translateY(-6px); border-color: color-mix(in srgb, var(--accent) 45%, var(--border)); box-shadow: var(--shadow); }
.project__head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; }
.project__folder { font-size: 1.6rem; color: var(--accent); }
.project__links a { font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-dim); transition: color 0.2s ease; }
.project__links a:hover { color: var(--accent); }
.project__title { font-family: var(--font-display); font-size: 1.2rem; margin-bottom: 12px; }
.project__desc { color: var(--text-dim); font-size: 0.95rem; flex-grow: 1; margin-bottom: 18px; }
.project__tags { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; }
.project__tags li { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-faint); }
.project__tags li::before { content: "#"; color: var(--accent); }

/* ---------- Contact ---------- */
.contact { text-align: center; }
.contact__inner { display: flex; flex-direction: column; align-items: center; }
.contact__title { font-family: var(--font-display); font-weight: 700; font-size: clamp(2.2rem, 6vw, 4rem); letter-spacing: -0.02em; line-height: 1.05; margin: 12px 0 20px; }
.contact__lede { color: var(--text-dim); max-width: 540px; margin-bottom: 34px; font-size: 1.08rem; }
.contact__links { display: flex; gap: 26px; margin-top: 28px; font-family: var(--font-mono); font-size: 0.9rem; flex-wrap: wrap; justify-content: center; }
.contact__links a { color: var(--text-dim); transition: color 0.2s ease; }
.contact__links a:hover { color: var(--accent); }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--border); padding: 28px 0; }
.footer__inner { display: flex; justify-content: center; align-items: center; font-size: 0.85rem; color: var(--text-faint); text-align: center; }

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero__inner { grid-template-columns: 1fr; gap: 48px; }
  .hero__photo { order: -1; }
  .about { grid-template-columns: 1fr; }
  .stats__grid { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: none; }
  .stat:nth-child(1), .stat:nth-child(2) { border-bottom: 1px solid var(--border); }
}

@media (max-width: 680px) {
  .nav__links {
    position: fixed; top: 66px; right: 16px; left: 16px; flex-direction: column; gap: 4px;
    background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 14px; box-shadow: var(--shadow); transform: translateY(-14px); opacity: 0; pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
  }
  .nav__links.open { opacity: 1; transform: none; pointer-events: auto; }
  .nav__links a { padding: 10px 6px; }
  .nav__burger { display: flex; }
  .section { padding: 72px 0; }
  .stats__grid { grid-template-columns: 1fr 1fr; }
  .hero__badge { left: 0; }
  .section__title::after { display: none; }
  .footer__inner { flex-direction: column; text-align: center; }
}

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