index.css

/* ========== CSS Reset & Base ==========
   A minimal, modern reset and design tokens */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html:focus-within { scroll-behavior: smooth; }
html, body { height: 100%; }
body { -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
img, picture, video, canvas, svg { display: block; max-width: 100%; }
input, button, textarea, select { font: inherit; }

:root {
  --bg: #0b0d12;
  --surface: #12151d;
  --text: #e6e9ef;
  --muted: #9aa4b2;
  --primary: #6ea8fe;
  --primary-600: #3d8bfd;
  --ring: rgba(110,168,254,.5);
  --ok: #21c55d;
  --warn: #f59e0b;
  --danger: #ef4444;
  --card: #141824;
  --border: #233043;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f7fb; --surface: #ffffff; --text: #0b1220; --muted: #475569;
    --primary: #1e66f5; --primary-600: #1a56d8; --ring: rgba(30,102,245,.25);
    --card: #ffffff; --border: #e5e7eb; --shadow: 0 10px 30px rgba(2,6,23,.08);
  }
}

/* Theme toggle support */
:root.theme-dark {
  --bg: #0b0d12; --surface: #12151d; --text: #e6e9ef; --muted: #9aa4b2;
  --primary: #6ea8fe; --primary-600: #3d8bfd; --ring: rgba(110,168,254,.5);
  --card: #141824; --border: #233043; --shadow: 0 10px 30px rgba(0,0,0,.35);
}
:root.theme-light {
  --bg: #f7f7fb; --surface: #ffffff; --text: #0b1220; --muted: #475569;
  --primary: #1e66f5; --primary-600: #1a56d8; --ring: rgba(30,102,245,.25);
  --card: #ffffff; --border: #e5e7eb; --shadow: 0 10px 30px rgba(2,6,23,.08);
}

body {
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container { width: min(1100px, 92%); margin-inline: auto; }
.section { padding: 6rem 0; }
.row { display: flex; align-items: center; }
.row.space-between { justify-content: space-between; }
.row.align-center { align-items: center; }
.row.align-end { align-items: flex-end; }
.row.gap { gap: .75rem; }
.grid { display: grid; gap: 2rem; }
.grid.two { grid-template-columns: repeat(2, minmax(0,1fr)); }
@media (max-width: 900px) { .grid.two { grid-template-columns: 1fr; } }

/* Header */
.site-header { position: sticky; top: 0; z-index: 50; background: color-mix(in oklab, var(--surface), transparent 10%); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
.brand { font-weight: 800; letter-spacing: .5px; font-size: 1.25rem; text-decoration: none; color: var(--text); }
.brand span { color: var(--primary); }
.nav { display: flex; align-items: center; gap: 1rem; }
.nav__toggle { display: none; border: none; background: transparent; font-size: 1.25rem; color: var(--text); }
.nav__menu { display: flex; list-style: none; gap: 1rem; }
.nav__menu a { color: var(--muted); text-decoration: none; padding: .75rem .5rem; border-radius: .5rem; }
.nav__menu a:hover { color: var(--text); background: color-mix(in oklab, var(--primary), transparent 88%); }
.header-actions { display: flex; align-items: center; gap: .75rem; }
@media (max-width: 800px) {
  .nav__toggle { display: inline-block; }
  .nav__menu { position: absolute; right: 1rem; top: 60px; flex-direction: column; background: var(--surface); border: 1px solid var(--border); padding: .5rem; border-radius: .75rem; box-shadow: var(--shadow); display: none; }
  .nav__menu.is-open { display: flex; }
}

/* Buttons */
.btn { --_bg: var(--surface); --_color: var(--text); --_border: var(--border); display: inline-flex; align-items: center; gap: .5rem; padding: .65rem 1rem; border-radius: .65rem; border: 1px solid var(--_border); background: var(--_bg); color: var(--_color); text-decoration: none; cursor: pointer; transition: transform .06s ease, background .2s ease, border-color .2s ease; }
.btn:active { transform: translateY(1px); }
.btn--primary { --_bg: var(--primary); --_border: var(--primary-600); --_color: white; }
.btn--primary:hover { background: var(--primary-600); }
.btn--ghost { background: transparent; }

/* Hero */
.hero { padding-top: 7rem; }
.eyebrow { color: var(--muted); text-transform: uppercase; letter-spacing: .15em; font-size: .8rem; }
.hero h1 { font-size: clamp(2.2rem, 5vw, 3.2rem); line-height: 1.1; margin-top: .5rem; }
.subtitle { font-size: clamp(1.05rem, 2.5vw, 1.25rem); color: var(--muted); margin-top: 1rem; }
.hero__cta { margin-top: 1.25rem; display: flex; gap: .75rem; }
.social { display: flex; gap: .75rem; margin-top: 1rem; list-style: none; }
.social a { font-size: 1.25rem; text-decoration: none; }

/* Fun orbit visual */
.hero__visual { display: grid; place-items: center; }
.orbit { position: relative; width: 320px; aspect-ratio: 1; border-radius: 50%; border: 2px dashed color-mix(in oklab, var(--primary), transparent 60%); }
.planet { position: absolute; inset: 50% auto auto 50%; width: 18px; height: 18px; margin:-9px; border-radius: 50%; background: var(--primary); box-shadow: 0 0 30px var(--ring); }
.satellite { position: absolute; width: 10px; height: 10px; background: color-mix(in oklab, var(--primary), white 15%); border-radius: 50%; animation: orbit 8s linear infinite; transform-origin: -110px -110px; left: 50%; top: 50%; }
@keyframes orbit { to { transform: rotate(360deg); } }

/* About */
.about-card { background: var(--card); border: 1px solid var(--border); padding: 1.25rem; border-radius: .85rem; box-shadow: var(--shadow); }
.badges { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1rem; }
.badge { background: color-mix(in oklab, var(--primary), transparent 85%); color: var(--text); padding: .35rem .6rem; border-radius: .5rem; border: 1px solid color-mix(in oklab, var(--primary), transparent 65%); font-size: .85rem; }

/* Skills */
.skills-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 1rem; margin-top: 1.25rem; }
.skill { background: var(--card); border: 1px solid var(--border); padding: 1rem; border-radius: .85rem; box-shadow: var(--shadow); }
@media (max-width: 1000px) { .skills-grid { grid-template-columns: repeat(2,1fr); } }
@media (max-width: 560px) { .skills-grid { grid-template-columns: 1fr; } }

/* Projects */
.filters { display: flex; gap: .5rem; }
.chip { padding: .4rem .75rem; border: 1px solid var(--border); background: var(--surface); border-radius: 999px; cursor: pointer; color: var(--muted); }
.chip.is-active { color: var(--text); border-color: var(--primary); }
.cards { margin-top: 1rem; display: grid; grid-template-columns: repeat(3,1fr); gap: 1rem; }
.card { background: var(--card); border: 1px solid var(--border); padding: 1rem; border-radius: .85rem; box-shadow: var(--shadow); cursor: pointer; outline: none; }
.card:focus { box-shadow: 0 0 0 3px var(--ring); }
.pill { display: inline-block; margin-top: .75rem; padding: .2rem .5rem; font-size: .75rem; border: 1px solid var(--border); border-radius: .5rem; color: var(--muted); }
@media (max-width: 1000px) { .cards { grid-template-columns: repeat(2,1fr); } }
@media (max-width: 640px) { .cards { grid-template-columns: 1fr; } }

/* Timeline */
.timeline { list-style: none; margin-top: 1rem; border-left: 2px dashed var(--border); padding-left: 1rem; }
.timeline li { position: relative; padding: .5rem 0 .5rem .5rem; }
.timeline .timestamp { position: absolute; left: -4.3rem; top: .35rem; font-weight: 600; color: var(--muted); }
.timeline li::before { content: ""; position: absolute; left: -10px; top: .7rem; width: 8px; height: 8px; background: var(--primary); border-radius: 999px; box-shadow: 0 0 0 3px var(--ring); }

/* Forms */
form { margin-top: 1rem; }
.form-row { display: grid; gap: .35rem; margin-bottom: .9rem; }
input, textarea { background: var(--surface); color: var(--text); border: 1px solid var(--border); border-radius: .65rem; padding: .65rem .75rem; }
input:focus, textarea:focus { outline: none; box-shadow: 0 0 0 3px var(--ring); border-color: var(--primary); }
.error { color: var(--danger); min-height: 1.1rem; font-size: .85rem; }
.form-status { margin-top: .5rem; font-weight: 600; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 2rem 0; background: color-mix(in oklab, var(--surface), transparent 10%); }

/* Modal */
.modal { position: fixed; inset: 0; display: none; }
.modal[aria-hidden="false"] { display: grid; place-items: center; }
.modal__backdrop { position: absolute; inset: 0; background: rgba(0,0,0,.55); }
.modal__dialog { position: relative; background: var(--surface); border: 1px solid var(--border); border-radius: .85rem; width: min(720px, 92%); box-shadow: var(--shadow); overflow: hidden; }
.modal__header { display: flex; justify-content: space-between; align-items: center; padding: .9rem 1rem; border-bottom: 1px solid var(--border); }
.modal__body { padding: 1rem; }
.modal__close { border: none; background: transparent; font-size: 1.1rem; cursor: pointer; color: var(--muted); }

/* Reveal on scroll */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

/* Utilities */
.skip-link { position: absolute; left: -9999px; }
.skip-link:focus { left: 1rem; top: 1rem; background: var(--primary); color: white; padding: .5rem .75rem; border-radius: .5rem; z-index: 100; }

h2 { font-size: clamp(1.6rem, 3vw, 2rem); margin-bottom: .75rem; }

/* Back to top */
#backToTop { position: fixed; right: 1rem; bottom: 1rem; display: none; }
#backToTop.is-visible { display: inline-flex; }