/*
  SPARKHIVE TECH LTD — Styles
  Palette: Electric Blue #1E90FF, Charcoal #1A1A1A, White #FFFFFF
  Font: Inter
*/

:root {
  --blue: #1E90FF;
  --charcoal: #1A1A1A;
  --bg: #0E0E10;
  --surface: #121318;
  --text: #E8EAF0;
  --muted: #A9AFB8;
  --border: rgba(255,255,255,0.08);
  --glow: 0 0 24px rgba(30, 144, 255, 0.35);
}

html[data-theme="light"] {
  --bg: #FFFFFF;
  --surface: #F7F9FC;
  --text: #17181C;
  --muted: #50535A;
  --border: rgba(0,0,0,0.08);
}

* { box-sizing: border-box; }
html, body { height: 100%; }

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 600px at 20% -10%, rgba(30,144,255,0.15), transparent),
              radial-gradient(800px 400px at 90% 10%, rgba(30,144,255,0.08), transparent),
              var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

.section { padding: 96px 0; }
.section.alt { background: var(--surface); }
.section-title {
  font-size: 2.25rem;
  margin: 0 0 24px;
  letter-spacing: -0.02em;
}

/*********** Header ***********/
.site-header {
  position: sticky; top: 0; z-index: 1000;
  backdrop-filter: saturate(1.2) blur(10px);
  background: linear-gradient(to bottom, rgba(18,19,24,0.75), rgba(18,19,24,0.35));
  border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { color: var(--text); text-decoration: none; font-weight: 700; letter-spacing: 0.04em; display: flex; gap: 10px; align-items: center; }
.logo-spark { color: var(--blue); filter: drop-shadow(0 0 8px rgba(30,144,255,0.8)); }
/* Brand text styling */
.brand .brand-text { font-weight: 700; letter-spacing: 0.04em; }

.nav-links { list-style: none; display: flex; gap: 20px; align-items: center; margin: 0; padding: 0; }
.nav-links a { color: var(--text); text-decoration: none; opacity: 0.85; }
.nav-links a:hover { color: var(--blue); opacity: 1; text-shadow: var(--glow); }

.nav-toggle { display: none; background: transparent; border: 0; width: 38px; height: 38px; position: relative; cursor: pointer; }
.nav-toggle .bar { position: absolute; left: 8px; right: 8px; height: 2px; background: var(--text); transition: transform .3s, top .3s, opacity .3s; }
.nav-toggle .bar:nth-child(1){ top: 12px; }
.nav-toggle .bar:nth-child(2){ top: 18px; }
.nav-toggle .bar:nth-child(3){ top: 24px; }

.theme-toggle { height: 36px; width: 36px; border-radius: 10px; border: 1px solid var(--border); background: transparent; color: var(--text); cursor: pointer; }
.theme-toggle:hover { box-shadow: var(--glow); border-color: rgba(30,144,255,0.4); }

/*********** Hero ***********/
.hero { position: relative; min-height: calc(100vh - 64px); display: grid; place-items: center; overflow: hidden; }
#heroParticles { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 1; }
.hero-content { position: relative; z-index: 2; text-align: center; padding: 96px 0 72px; }
.hero-logo { font-size: 4rem; color: var(--blue); margin: 0 auto 24px; display: block; text-align: center; filter: drop-shadow(0 0 24px rgba(30,144,255,0.8)); }
.hero h1 { font-size: clamp(2.4rem, 4vw + 1rem, 4rem); margin: 0 0 16px; letter-spacing: -0.03em; }
.hero .sub { font-size: clamp(1.05rem, 1.2vw + .6rem, 1.4rem); color: var(--muted); margin: 0 0 28px; }
.actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

.btn { --ring: rgba(30,144,255,0.5); display: inline-flex; align-items: center; gap: 10px; border: 1px solid var(--border); color: var(--text); text-decoration: none; padding: 12px 16px; border-radius: 12px; transition: transform .2s, box-shadow .2s, border-color .2s; }
.btn:hover { transform: translateY(-2px); box-shadow: var(--glow); border-color: rgba(30,144,255,0.4); }
.btn.primary { background: linear-gradient(180deg, rgba(30,144,255,0.16), rgba(30,144,255,0.06)); border-color: rgba(30,144,255,0.45); box-shadow: inset 0 0 0 1px rgba(30,144,255,0.25), var(--glow); }
.btn.ghost { background: transparent; }
.btn.full { width: 100%; justify-content: center; }

/*********** Services ***********/
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 22px; box-shadow: 0 1px 0 rgba(0,0,0,0.2), 0 2px 18px rgba(0,0,0,0.08); transition: transform .25s, box-shadow .25s, border-color .25s; }
.card:hover { transform: translateY(-4px); box-shadow: 0 10px 30px rgba(30,144,255,0.12); border-color: rgba(30,144,255,0.4); }
.card .icon { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 12px; background: linear-gradient(180deg, rgba(30,144,255,0.18), rgba(30,144,255,0.06)); color: var(--blue); margin-bottom: 12px; box-shadow: inset 0 0 0 1px rgba(30,144,255,0.35), var(--glow); }
.card h3 { margin: 8px 0; font-size: 1.1rem; }
.card p { margin: 0 0 14px; color: var(--muted); }
.tags { list-style: none; display: flex; gap: 8px; padding: 0; margin: 0; flex-wrap: wrap; }
.tags li { font-size: 0.85rem; padding: 6px 10px; border: 1px solid var(--border); color: var(--text); border-radius: 999px; background: rgba(255,255,255,0.02); }

/*********** About ***********/
.about-grid { display: grid; grid-template-columns: 1fr; gap: 40px; align-items: start; }
.mvv { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 16px; }
.mvv-item { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 16px; }
.mvv-item h3 { margin: 0 0 8px; font-size: 1rem; }

.team { display: grid; grid-template-columns: 1fr; gap: 12px; }
.member { display: flex; gap: 12px; align-items: center; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 10px; }
.avatar { width: 44px; height: 44px; border-radius: 12px; background: linear-gradient(135deg, rgba(30,144,255,0.25), rgba(30,144,255,0.05)); box-shadow: inset 0 0 0 1px rgba(30,144,255,0.4), var(--glow); }

/*********** Projects ***********/
.project-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.project-card { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; overflow: hidden; transition: transform .25s, border-color .25s, box-shadow .25s; }
.project-card:hover { transform: translateY(-4px); border-color: rgba(30,144,255,0.4); box-shadow: 0 10px 30px rgba(30,144,255,0.12); }
.thumb { height: 160px; position: relative; background: linear-gradient(135deg, rgba(30,144,255,0.18), rgba(30,144,255,0.06)); box-shadow: inset 0 0 0 1px rgba(30,144,255,0.35); }
.thumb::after { content: attr(data-title); position: absolute; bottom: 12px; left: 12px; font-weight: 700; letter-spacing: 0.02em; color: #fff; text-shadow: 0 2px 12px rgba(0,0,0,0.45); }
.project-body { padding: 16px; }
.project-body h3 { margin: 0 0 8px; }
.stack { list-style: none; display: flex; gap: 8px; padding: 0; margin: 8px 0 0; flex-wrap: wrap; }
.stack li { font-size: 0.8rem; padding: 6px 10px; border: 1px solid var(--border); border-radius: 999px; background: rgba(255,255,255,0.02); }

/*********** Contact ***********/
.contact-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 36px; align-items: start; }
.contact-list { list-style: none; padding: 0; margin: 16px 0 0; display: grid; gap: 8px; }
.contact-list .socials { display: flex; gap: 12px; align-items: center; }
.contact-list a { color: var(--text); opacity: .85; }
.contact-list a:hover { color: var(--blue); text-shadow: var(--glow); opacity: 1; }

.contact-form { background: var(--bg); border: 1px solid var(--border); border-radius: 16px; padding: 16px; box-shadow: 0 1px 0 rgba(0,0,0,0.2), 0 2px 18px rgba(0,0,0,0.08); }
.field { display: grid; gap: 6px; margin-bottom: 12px; }
label { font-size: .9rem; color: var(--muted); }
input, textarea { width: 100%; color: var(--text); background: rgba(255,255,255,0.02); border: 1px solid var(--border); border-radius: 12px; padding: 11px 12px; outline: none; }
input:focus, textarea:focus { border-color: rgba(30,144,255,0.45); box-shadow: var(--glow); }
.form-note { margin: 10px 0 0; font-size: .9rem; color: var(--muted); }

/*********** Footer ***********/
.site-footer { border-top: 1px solid var(--border); padding: 36px 0; background: linear-gradient(to top, rgba(18,19,24,0.75), rgba(18,19,24,0.1)); }
.footer-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 20px; align-items: start; }
.footer-grid .brand { font-size: 1rem; }
.footer-grid nav { display: grid; gap: 6px; }
.footer-grid nav a { color: var(--text); opacity: .85; text-decoration: none; }
.footer-grid nav a:hover { color: var(--blue); text-shadow: var(--glow); }

/*********** Floating Contact ***********/
.floating-contact { position: fixed; right: 16px; bottom: 16px; z-index: 1001; padding: 12px 16px; background: linear-gradient(180deg, rgba(30,144,255,0.2), rgba(30,144,255,0.08)); border: 1px solid rgba(30,144,255,0.45); color: white; border-radius: 999px; text-decoration: none; box-shadow: var(--glow); display: inline-flex; align-items: center; gap: 8px; }
.floating-contact:hover { transform: translateY(-2px); }

/*********** Reveal on scroll ***********/
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s ease, transform .6s ease; }
.reveal.reveal-visible { opacity: 1; transform: translateY(0); }

/*********** Responsive ***********/
@media (max-width: 1024px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .project-grid { grid-template-columns: repeat(3, 1fr); }
  .about-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .nav-toggle { display: inline-block; }
  .nav-links { position: fixed; inset: 64px 0 auto 0; background: var(--surface); border-bottom: 1px solid var(--border); padding: 16px; display: grid; gap: 12px; transform: translateY(-120%); transition: transform .3s ease; }
  .nav-links.open { transform: translateY(0); }
  .cards { grid-template-columns: 1fr; }
  .project-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}
