/* ============================================================
   Swarit Tiwari — Portfolio · "Technical Blueprint" theme
   ============================================================ */

:root {
  --bg:        #0a0e16;
  --surface:   #0e1421;
  --surface-2: #121b2b;
  --border:    rgba(125, 158, 192, 0.16);
  --border-2:  rgba(125, 158, 192, 0.28);
  --text:      #c6d1e0;
  --muted:     #7c8aa3;
  --heading:   #eef3fa;
  --cyan:      #38e1ff;
  --cyan-dim:  rgba(56, 225, 255, 0.12);
  --amber:     #ffb22e;
  --amber-dim: rgba(255, 178, 46, 0.12);

  --mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  --maxw: 1120px;
  --r: 10px;
  --gap: clamp(1rem, 3vw, 2rem);
}

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

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

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: clamp(15px, 1.6vw, 16.5px);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.mono { font-family: var(--mono); letter-spacing: 0.04em; }

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

.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: clamp(1.1rem, 4vw, 2.2rem); }

/* ---------- blueprint grid backdrop ---------- */
.grid-bg {
  position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background-color: var(--bg);
  background-image:
    linear-gradient(rgba(125,158,192,0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(125,158,192,0.045) 1px, transparent 1px);
  background-size: 44px 44px;
}
.grid-bg::after {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 80% 55% at 50% -10%, rgba(56,225,255,0.10), transparent 60%),
    radial-gradient(ellipse 60% 50% at 100% 100%, rgba(255,178,46,0.06), transparent 55%);
}

/* ============ NAV ============ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  background: rgba(10, 14, 22, 0.72);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow .3s, background .3s;
}
.nav.is-scrolled { box-shadow: 0 8px 30px rgba(0,0,0,.4); background: rgba(10,14,22,.9); }
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 1rem; }

.brand { display: flex; align-items: center; gap: .55rem; font-weight: 600; }
.brand__mark { font-family: var(--mono); color: var(--cyan); font-weight: 700; }
.brand__name { color: var(--heading); }

.nav__links { display: flex; gap: clamp(.6rem, 2vw, 1.6rem); }
.nav__links a {
  font-size: .92rem; color: var(--muted); display: inline-flex; align-items: baseline; gap: .35rem;
  padding: .4rem 0; position: relative; transition: color .2s;
}
.nav__links a:hover { color: var(--heading); }
.nav__num { font-family: var(--mono); font-size: .72rem; color: var(--cyan); }
.nav__links a::after {
  content: ""; position: absolute; left: 0; bottom: -2px; height: 2px; width: 0;
  background: var(--cyan); transition: width .25s;
}
.nav__links a:hover::after, .nav__links a.is-current::after { width: 100%; }

.nav__actions { display: flex; align-items: center; gap: 1rem; }
.lang { display: flex; align-items: center; gap: .35rem; font-family: var(--mono); font-size: .85rem; }
.lang__btn {
  background: none; border: none; color: var(--muted); cursor: pointer; font: inherit;
  padding: .15rem .25rem; transition: color .2s;
}
.lang__btn:hover { color: var(--text); }
.lang__btn.is-active { color: var(--cyan); }
.lang__sep { color: var(--border-2); }

.hamburger { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.hamburger span { width: 24px; height: 2px; background: var(--heading); transition: .3s; }
.hamburger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.is-open span:nth-child(2) { opacity: 0; }
.hamburger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============ HERO ============ */
.hero { position: relative; min-height: 100svh; display: flex; align-items: center; padding-top: 64px; }
.hero__inner { padding-block: clamp(2rem, 8vh, 6rem); }
.tag-line { color: var(--cyan); font-size: clamp(.75rem, 2vw, .9rem); margin-bottom: 1.2rem; }
.hero__name {
  font-size: clamp(2.6rem, 9vw, 5.6rem); line-height: 1.02; color: var(--heading);
  font-weight: 700; letter-spacing: -0.02em;
}
.hero__role { font-size: clamp(1.05rem, 3vw, 1.7rem); color: var(--text); font-weight: 500; margin-top: .6rem; }
.hero__role::before { content: "// "; color: var(--amber); font-family: var(--mono); }
.hero__lead { max-width: 60ch; color: var(--muted); margin-top: 1.3rem; font-size: clamp(1rem, 2.2vw, 1.12rem); }

.hero__cta { display: flex; flex-wrap: wrap; gap: .9rem; margin-top: 2rem; }
.btn {
  display: inline-flex; align-items: center; gap: .5rem; font-weight: 600; font-size: .95rem;
  padding: .78rem 1.5rem; border-radius: var(--r); border: 1px solid transparent; cursor: pointer;
  transition: transform .18s, box-shadow .25s, background .2s, border-color .2s; font-family: var(--sans);
}
.btn--primary { background: var(--cyan); color: #04121b; box-shadow: 0 0 0 rgba(56,225,255,0); }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(56,225,255,.28); }
.btn--ghost { border-color: var(--border-2); color: var(--heading); }
.btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); transform: translateY(-2px); }

.hero__stats {
  list-style: none; display: grid; grid-template-columns: repeat(4, minmax(0,1fr));
  gap: 1rem; margin-top: 3rem; max-width: 680px;
}
.hero__stats li { border-left: 2px solid var(--border-2); padding-left: .9rem; }
.stat__num { display: block; font-size: clamp(1.5rem, 4vw, 2.3rem); font-weight: 700; color: var(--heading); font-family: var(--mono); }
.stat__num small { font-size: .55em; color: var(--cyan); }
.stat__label { display: block; font-size: .66rem; color: var(--muted); margin-top: .2rem; }

.scroll-hint {
  position: absolute; bottom: 1.4rem; left: 50%; transform: translateX(-50%);
  font-size: .7rem; color: var(--muted); animation: bob 2s ease-in-out infinite;
}
@keyframes bob { 0%,100% { transform: translate(-50%, 0); } 50% { transform: translate(-50%, 6px); } }

/* ============ SECTIONS ============ */
.section { padding-block: clamp(3.5rem, 9vw, 6.5rem); border-top: 1px solid var(--border); }
.section__title { font-size: clamp(1.6rem, 5vw, 2.4rem); color: var(--heading); font-weight: 700; display: flex; align-items: baseline; gap: .7rem; }
.section__num { font-size: .8rem; color: var(--cyan); border: 1px solid var(--border-2); border-radius: 6px; padding: .2rem .45rem; }
.section__lead { color: var(--muted); margin-top: .7rem; max-width: 65ch; }

/* ---------- About ---------- */
.about { display: grid; grid-template-columns: 1.6fr 1fr; gap: var(--gap); margin-top: 2.2rem; }
.about__body p + p { margin-top: 1rem; }
.about__body strong { color: var(--cyan); font-weight: 600; }
.about__panel { position: relative; background: var(--surface); border: 1px solid var(--border); border-radius: var(--r); padding: 1.5rem; }
.about__panel::before, .about__panel::after { content: ""; position: absolute; width: 12px; height: 12px; border: 2px solid var(--cyan); }
.about__panel::before { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.about__panel::after { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }
.panel__title { color: var(--cyan); font-size: .78rem; margin-bottom: 1.1rem; }
.facts > div { padding-block: .55rem; border-bottom: 1px dashed var(--border); }
.facts > div:last-child { border-bottom: 0; }
.facts dt { font-size: .66rem; color: var(--muted); }
.facts dd { color: var(--heading); margin-top: .15rem; }

/* ---------- Skills ---------- */
.skills { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1.1rem; margin-top: 2.2rem; }
.skill-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r); padding: 1.3rem; transition: border-color .25s, transform .2s; }
.skill-card:hover { border-color: var(--border-2); transform: translateY(-3px); }
.skill-card h3 { font-family: var(--mono); font-size: .82rem; color: var(--amber); margin-bottom: .9rem; display: flex; align-items: center; gap: .5rem; }
.skill-card h3::before { content: ""; width: 7px; height: 7px; background: var(--amber); border-radius: 1px; }
.chips { display: flex; flex-wrap: wrap; gap: .45rem; }
.chip { font-size: .8rem; color: var(--text); background: var(--surface-2); border: 1px solid var(--border); border-radius: 100px; padding: .3rem .75rem; transition: color .2s, border-color .2s; }
.chip:hover { color: var(--cyan); border-color: var(--cyan); }

/* ---------- Projects ---------- */
.projects { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 1.4rem; margin-top: 2.2rem; }
.card {
  display: flex; flex-direction: column; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--r); overflow: hidden; transition: transform .22s, border-color .25s, box-shadow .25s;
}
.card:hover { transform: translateY(-5px); border-color: var(--cyan); box-shadow: 0 16px 40px rgba(0,0,0,.45); }
.card__media { position: relative; display: block; width: 100%; aspect-ratio: 16 / 10; overflow: hidden; background: var(--surface-2); border: 0; padding: 0; cursor: pointer; font: inherit; }
.card__media img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s, opacity .4s; }
.card:hover .card__media img { transform: scale(1.06); }
.card__year { position: absolute; top: .7rem; right: .7rem; font-family: var(--mono); font-size: .7rem; color: var(--cyan); background: rgba(10,14,22,.8); border: 1px solid var(--border-2); border-radius: 5px; padding: .2rem .5rem; }
.card__badge { position: absolute; top: .7rem; left: .7rem; font-family: var(--mono); font-size: .7rem; color: #04121b; background: var(--amber); border-radius: 5px; padding: .2rem .5rem; font-weight: 700; }
.card__body { padding: 1.2rem 1.25rem 1.35rem; display: flex; flex-direction: column; flex: 1; }
.card__title { color: var(--heading); font-size: 1.12rem; font-weight: 600; line-height: 1.3; }
.card__role { font-family: var(--mono); font-size: .72rem; color: var(--amber); margin-top: .3rem; }
.card__desc { color: var(--muted); font-size: .92rem; margin-top: .7rem; flex: 1; }
.card__tags { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: 1rem; }
.card__tags span { font-family: var(--mono); font-size: .68rem; color: var(--text); border: 1px solid var(--border); border-radius: 4px; padding: .15rem .45rem; }
.card__link { margin-top: 1.1rem; display: inline-flex; align-items: center; gap: .45rem; color: var(--cyan); font-weight: 600; font-size: .88rem; }
.card__link svg { transition: transform .2s; }
.card__link:hover svg { transform: translate(3px, -3px); }

/* ---------- Timeline ---------- */
.timeline { margin-top: 2.4rem; position: relative; padding-left: 1.8rem; }
.timeline::before { content: ""; position: absolute; left: 5px; top: 6px; bottom: 6px; width: 2px; background: linear-gradient(var(--cyan), var(--border) 40%); }
.tl-item { position: relative; padding-bottom: 2.2rem; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before { content: ""; position: absolute; left: -1.8rem; top: 5px; width: 12px; height: 12px; border-radius: 50%; background: var(--bg); border: 2px solid var(--cyan); transform: translateX(-1px); }
.tl-item[data-type="work"]::before { border-color: var(--amber); }
.tl-period { font-family: var(--mono); font-size: .74rem; color: var(--cyan); }
.tl-badge { font-family: var(--mono); font-size: .62rem; text-transform: uppercase; letter-spacing: .08em; padding: .12rem .45rem; border-radius: 4px; margin-left: .5rem; border: 1px solid var(--border-2); color: var(--muted); }
.tl-badge[data-k="work"] { color: var(--amber); border-color: var(--amber-dim); }
.tl-badge[data-k="education"] { color: var(--cyan); }
.tl-badge[data-k="thesis"] { color: var(--text); }
.tl-title { color: var(--heading); font-size: 1.08rem; font-weight: 600; margin-top: .25rem; }
.tl-org { color: var(--text); font-size: .92rem; margin-top: .1rem; }
.tl-org em { color: var(--muted); font-style: normal; }
.tl-points { list-style: none; margin-top: .6rem; display: flex; flex-direction: column; gap: .3rem; }
.tl-points li { color: var(--muted); font-size: .9rem; padding-left: 1rem; position: relative; }
.tl-points li::before { content: "▸"; position: absolute; left: 0; color: var(--cyan); }
.tl-meta { margin-top: .5rem; display: flex; flex-wrap: wrap; gap: .4rem; }
.tl-meta span { font-family: var(--mono); font-size: .68rem; color: var(--text); border: 1px solid var(--border); border-radius: 4px; padding: .12rem .45rem; }

/* ---------- Contact ---------- */
.contact { margin-top: 2.2rem; max-width: 720px; }
.contact__lead { color: var(--text); font-size: clamp(1.05rem, 2.4vw, 1.25rem); }
.contact__links { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px,1fr)); gap: 1rem; margin-top: 1.8rem; }
.contact-card { display: flex; align-items: center; gap: .9rem; background: var(--surface); border: 1px solid var(--border); border-radius: var(--r); padding: 1rem 1.2rem; transition: border-color .25s, transform .2s; }
.contact-card:hover { border-color: var(--cyan); transform: translateY(-3px); }
.contact-card .ic { width: 38px; height: 38px; flex: none; display: grid; place-items: center; border: 1px solid var(--border-2); border-radius: 8px; color: var(--cyan); }
.contact-card .ck { font-family: var(--mono); font-size: .66rem; color: var(--muted); }
.contact-card .cv { color: var(--heading); font-weight: 500; font-size: .92rem; word-break: break-all; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--border); padding-block: 1.6rem; }
.footer__inner { display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap; }
.footer span { font-size: .78rem; color: var(--muted); }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in-view { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
  .scroll-hint { animation: none; }
}

/* ---------- CV button (nav) ---------- */
.cv-btn {
  display: inline-flex; align-items: center; gap: .4rem; font-family: var(--mono);
  font-size: .8rem; font-weight: 500; color: var(--cyan);
  border: 1px solid var(--cyan); border-radius: 7px; padding: .4rem .75rem;
  transition: background .2s, color .2s, transform .15s;
}
.cv-btn:hover { background: var(--cyan); color: #04121b; transform: translateY(-1px); }
.cv-btn svg { flex: none; }

/* ---------- About avatar ---------- */
.about__side { display: flex; flex-direction: column; gap: 1.1rem; }
.avatar {
  position: relative; align-self: start; width: 100%; max-width: 260px; aspect-ratio: 1;
  border: 1px solid var(--border-2); border-radius: var(--r); overflow: hidden; background: var(--surface-2);
}
.avatar::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  box-shadow: inset 0 0 0 1px rgba(56,225,255,.18);
  background: linear-gradient(180deg, transparent 60%, rgba(10,14,22,.5));
}
.avatar img { width: 100%; height: 100%; object-fit: cover; display: block; filter: saturate(1.02) contrast(1.02); }

/* ---------- Project detail buttons ---------- */
.card__actions { margin-top: 1.1rem; display: flex; align-items: center; gap: .9rem; flex-wrap: wrap; }
.card__btn {
  display: inline-flex; align-items: center; gap: .45rem; cursor: pointer; font: inherit;
  font-size: .85rem; font-weight: 600; color: #04121b; background: var(--cyan);
  border: none; border-radius: 7px; padding: .5rem .9rem; transition: transform .15s, box-shadow .2s;
}
.card__btn:hover { transform: translateY(-2px); box-shadow: 0 8px 22px rgba(56,225,255,.25); }
.card__gh { display: inline-flex; align-items: center; gap: .4rem; color: var(--muted); font-size: .82rem; font-weight: 600; transition: color .2s; }
.card__gh:hover { color: var(--cyan); }
.card__gh svg { transition: transform .2s; }
.card__gh:hover svg { transform: translate(2px,-2px); }

/* ---------- README modal ---------- */
.modal {
  position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; padding: clamp(.6rem, 3vw, 2rem);
  opacity: 0; visibility: hidden; pointer-events: none; transition: opacity .25s, visibility .25s;
}
.modal.is-open { opacity: 1; visibility: visible; pointer-events: auto; }
.modal__backdrop { position: absolute; inset: 0; background: rgba(4,8,14,.78); backdrop-filter: blur(4px); }
.modal__dialog {
  position: relative; width: min(860px, 100%); max-height: 88vh; display: flex; flex-direction: column;
  background: var(--surface); border: 1px solid var(--border-2); border-radius: 12px; overflow: hidden;
  box-shadow: 0 30px 80px rgba(0,0,0,.6); transform: translateY(12px); transition: transform .25s;
}
.modal.is-open .modal__dialog { transform: none; }
.modal__head {
  display: flex; align-items: center; gap: .8rem; padding: .9rem 1.1rem; border-bottom: 1px solid var(--border);
  background: var(--surface-2); flex: none;
}
.modal__title { color: var(--heading); font-size: 1rem; font-weight: 600; flex: 1; min-width: 0; }
.modal__gh, .modal__close { color: var(--muted); background: none; border: none; cursor: pointer; display: inline-flex; align-items: center; transition: color .2s; }
.modal__gh:hover, .modal__close:hover { color: var(--cyan); }
.modal__close { font-size: 1.7rem; line-height: 1; padding: 0 .2rem; }
.modal__body { overflow-y: auto; padding: clamp(1.1rem, 3vw, 2rem); }

/* ---------- Rendered markdown ---------- */
.markdown-body { color: var(--text); font-size: .94rem; line-height: 1.7; }
.markdown-body > *:first-child { margin-top: 0; }
.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4 { color: var(--heading); line-height: 1.3; margin: 1.6rem 0 .7rem; font-weight: 700; }
.markdown-body h1 { font-size: 1.6rem; } .markdown-body h2 { font-size: 1.3rem; border-bottom: 1px solid var(--border); padding-bottom: .35rem; }
.markdown-body h3 { font-size: 1.1rem; color: var(--cyan); } .markdown-body h4 { font-size: .98rem; color: var(--amber); }
.markdown-body p { margin: .7rem 0; } .markdown-body strong { color: var(--heading); }
.markdown-body a { color: var(--cyan); text-decoration: underline; text-underline-offset: 2px; }
.markdown-body ul, .markdown-body ol { margin: .7rem 0; padding-left: 1.4rem; } .markdown-body li { margin: .3rem 0; }
.markdown-body img { border-radius: 8px; border: 1px solid var(--border); margin: 1rem 0; max-width: 100%; height: auto; }
.markdown-body blockquote { border-left: 3px solid var(--amber); background: var(--amber-dim); margin: 1rem 0; padding: .6rem 1rem; border-radius: 0 8px 8px 0; color: var(--text); }
.markdown-body hr { border: none; border-top: 1px solid var(--border); margin: 1.6rem 0; }
.markdown-body code { font-family: var(--mono); font-size: .85em; background: var(--surface-2); border: 1px solid var(--border); border-radius: 4px; padding: .1em .4em; }
.markdown-body pre { background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px; padding: 1rem; overflow-x: auto; margin: 1rem 0; }
.markdown-body pre code { background: none; border: none; padding: 0; }
.markdown-body table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: .88rem; display: block; overflow-x: auto; }
.markdown-body th, .markdown-body td { border: 1px solid var(--border); padding: .5rem .7rem; text-align: left; }
.markdown-body th { background: var(--surface-2); color: var(--heading); }
.markdown-body .mermaid { background: #fff; border-radius: 8px; padding: 1rem; margin: 1rem 0; text-align: center; overflow-x: auto; }
.modal__status { color: var(--muted); font-family: var(--mono); font-size: .85rem; padding: 1rem 0; }
.modal__status a { color: var(--cyan); }

/* ============ RESPONSIVE ============ */
@media (max-width: 860px) {
  .hamburger { display: flex; }
  .nav__links {
    position: fixed; inset: 64px 0 auto 0; flex-direction: column; gap: 0;
    background: rgba(12,18,28,.98); backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border); padding: .5rem 0;
    clip-path: inset(0 0 100% 0); transition: clip-path .3s ease;
  }
  .nav__links.is-open { clip-path: inset(0 0 0 0); }
  .nav__links a { padding: .95rem clamp(1.1rem,4vw,2.2rem); font-size: 1rem; border-bottom: 1px solid var(--border); }
  .nav__links a::after { display: none; }
  .about { grid-template-columns: 1fr; }
  .about__side { flex-direction: row; align-items: flex-start; }
  .avatar { max-width: 220px; }
  .about__panel { flex: 1; }
  .hero__stats { grid-template-columns: repeat(2, 1fr); gap: 1.2rem 1rem; }
}
@media (max-width: 560px) {
  .cv-btn span { display: none; }
  .cv-btn { padding: .45rem .55rem; }
}
@media (max-width: 480px) {
  .projects { grid-template-columns: 1fr; }
  .about__side { flex-direction: column; }
  .avatar { max-width: 100%; }
  .footer__inner { flex-direction: column; align-items: flex-start; }
  .brand__name { display: none; }
}