/* ==========================================================================
   Opshanka Prabath — Portfolio
   Zero-build static site. Edit values in :root to re-theme everything.
   ========================================================================== */

:root {
  /* Brand palette */
  --accent: #14b8a6;         /* teal — matches the OPSY brand */
  --accent-2: #6366f1;       /* indigo — gradient partner */
  --accent-3: #22d3ee;       /* cyan glow */

  /* Dark theme (default) */
  --bg: #070b16;
  --bg-soft: #0d1425;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-brd: rgba(255, 255, 255, 0.08);
  --text: #e8ecf5;
  --text-dim: #9aa6bd;
  --heading: #f5f8ff;

  --radius: 18px;
  --radius-sm: 12px;
  --maxw: 1180px;
  --shadow: 0 20px 60px -20px rgba(0, 0, 0, 0.6);
  --font-head: "Sora", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
}

:root[data-theme="light"] {
  --bg: #f4f6fb;
  --bg-soft: #ffffff;
  --surface: rgba(10, 20, 45, 0.03);
  --surface-brd: rgba(10, 20, 45, 0.10);
  --text: #26324a;
  --text-dim: #5b6a86;
  --heading: #0d1730;
  --shadow: 0 20px 50px -24px rgba(30, 50, 90, 0.35);
}

/* --------------------------------------------------------------------- Base */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
h1, h2, h3, .brand span { font-family: var(--font-head); color: var(--heading); line-height: 1.1; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
section { scroll-margin-top: 90px; }

/* ------------------------------------------------------------ Background FX */
.bg-aurora { position: fixed; inset: 0; z-index: -2; overflow: hidden; }
.orb { position: absolute; border-radius: 50%; filter: blur(90px); opacity: 0.55; will-change: transform; }
.orb-1 { width: 480px; height: 480px; background: var(--accent); top: -120px; left: -80px; animation: drift 18s ease-in-out infinite; }
.orb-2 { width: 520px; height: 520px; background: var(--accent-2); top: 30%; right: -140px; animation: drift 22s ease-in-out infinite reverse; }
.orb-3 { width: 400px; height: 400px; background: var(--accent-3); bottom: -120px; left: 30%; opacity: 0.35; animation: drift 26s ease-in-out infinite; }
:root[data-theme="light"] .orb { opacity: 0.28; }
:root[data-theme="light"] .float-card { background: rgba(255, 255, 255, 0.92); border-color: rgba(10, 20, 45, 0.10); box-shadow: 0 14px 32px -14px rgba(30, 50, 90, 0.3); }
.grid-overlay {
  position: absolute; inset: 0;
  background-image: linear-gradient(var(--surface-brd) 1px, transparent 1px),
                    linear-gradient(90deg, var(--surface-brd) 1px, transparent 1px);
  background-size: 54px 54px;
  mask-image: radial-gradient(ellipse at 50% 0%, #000 0%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 0%, #000 0%, transparent 75%);
  opacity: 0.5;
}
@keyframes drift {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, -30px) scale(1.08); }
}

/* ----------------------------------------------------------------- Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 24px; border-radius: 999px; font-weight: 600; font-size: 0.95rem;
  cursor: pointer; border: 1px solid transparent; white-space: nowrap; transition: transform .18s ease, box-shadow .25s ease, background .2s ease;
}
.btn-sm { padding: 9px 18px; font-size: 0.88rem; }
.btn-primary {
  color: #04120f; background: linear-gradient(120deg, var(--accent), var(--accent-3));
  box-shadow: 0 10px 30px -8px rgba(20, 184, 166, 0.6);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 40px -10px rgba(20, 184, 166, 0.75); }
.btn-ghost { color: var(--text); border-color: var(--surface-brd); background: var(--surface); }
.btn-ghost:hover { transform: translateY(-2px); border-color: var(--accent); }

/* --------------------------------------------------------------------- Nav */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 16px clamp(18px, 4vw, 48px);
  transition: background .3s ease, box-shadow .3s ease, backdrop-filter .3s ease;
}
.nav.scrolled {
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 var(--surface-brd);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; }
.brand span { display: flex; flex-direction: column; font-size: 1.05rem; letter-spacing: .06em; }
.brand small { font-size: .52rem; font-weight: 600; letter-spacing: .22em; color: var(--text-dim); }
.nav-links { display: flex; gap: 28px; font-size: .95rem; color: var(--text-dim); }
.nav-links a { position: relative; transition: color .2s; }
.nav-links a:hover { color: var(--text); }
.nav-links a::after { content: ""; position: absolute; left: 0; bottom: -6px; height: 2px; width: 0; background: var(--accent); transition: width .25s; }
.nav-links a:hover::after { width: 100%; }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.theme-toggle {
  width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center;
  background: var(--surface); border: 1px solid var(--surface-brd); color: var(--text); cursor: pointer; transition: transform .2s, border-color .2s;
}
.theme-toggle:hover { transform: rotate(15deg); border-color: var(--accent); }
.theme-toggle .i-moon { display: none; }
:root[data-theme="light"] .theme-toggle .i-sun { display: none; }
:root[data-theme="light"] .theme-toggle .i-moon { display: block; }

.nav-burger { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-burger span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: transform .3s, opacity .3s; }
.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; max-width: var(--maxw); margin: 0 auto;
  padding: clamp(120px, 16vh, 190px) clamp(18px, 4vw, 48px) 60px;
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 40px; align-items: center;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; font-size: .82rem; font-weight: 600;
  color: var(--text-dim); background: var(--surface); border: 1px solid var(--surface-brd);
  padding: 7px 14px; border-radius: 999px; margin-bottom: 22px;
}
.eyebrow .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 rgba(20,184,166,.6); } 70% { box-shadow: 0 0 0 10px rgba(20,184,166,0); } 100% { box-shadow: 0 0 0 0 rgba(20,184,166,0); } }
.hero h1 { font-size: clamp(2.4rem, 6vw, 4.2rem); font-weight: 800; margin: 0 0 20px; letter-spacing: -.02em; }
.hero h1 .amp { color: var(--accent); }
.grad { background: linear-gradient(100deg, var(--accent), var(--accent-2) 60%, var(--accent-3)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { font-size: 1.1rem; color: var(--text-dim); max-width: 34rem; margin: 0 0 30px; }
.lead strong { color: var(--text); }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 40px; }
.hero-stats { display: flex; flex-wrap: wrap; gap: 30px; }
.hero-stats div { display: flex; flex-direction: column; }
.hero-stats b { font-family: var(--font-head); font-size: 1.5rem; color: var(--heading); }
.hero-stats span { font-size: .82rem; color: var(--text-dim); }

.hero-visual { position: relative; display: grid; place-items: center; }
.photo-frame {
  position: relative; width: 100%; max-width: 400px; aspect-ratio: 4 / 5;
  border-radius: 26px; overflow: hidden;
  background:
    radial-gradient(120% 90% at 50% 0%, color-mix(in srgb, var(--accent) 30%, transparent), transparent 60%),
    linear-gradient(160deg, var(--bg-soft), color-mix(in srgb, var(--accent-2) 22%, var(--bg-soft)));
  border: 1px solid var(--surface-brd);
  box-shadow: var(--shadow);
}
.photo-glow { position: absolute; inset: -10% -10% 20%; background: radial-gradient(circle at 50% 40%, var(--accent) 0%, transparent 62%); filter: blur(46px); opacity: .45; z-index: 0; }
.hero-photo {
  position: absolute; bottom: 0; left: 50%; transform: translateX(-50%);
  height: 100%; width: auto; max-width: none; z-index: 1;
  object-fit: cover; object-position: top center;
  filter: drop-shadow(0 24px 40px rgba(0,0,0,.45));
}
.float-card {
  position: absolute; display: flex; align-items: center; gap: 10px;
  background: color-mix(in srgb, var(--bg-soft) 82%, transparent); backdrop-filter: blur(10px);
  border: 1px solid var(--surface-brd); border-radius: 14px; padding: 10px 14px; box-shadow: var(--shadow);
  animation: bob 4s ease-in-out infinite;
}
.float-card b { display: block; font-size: .9rem; color: var(--heading); }
.float-card small { color: var(--text-dim); font-size: .72rem; }
.fc-ico { font-size: 1.3rem; }
.fc-1 { bottom: 14%; left: -7%; }
.fc-2 { top: 12%; right: -9%; animation-delay: 1.5s; }
@keyframes bob { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

.social-rail {
  position: fixed; left: 26px; bottom: 0; z-index: 40;
  display: flex; flex-direction: column; align-items: center; gap: 16px;
  list-style: none; padding: 0; margin: 0;
}
.social-rail::after { content: ""; width: 1px; height: 88px; background: var(--surface-brd); }
.social-rail a {
  width: 40px; height: 40px; display: grid; place-items: center; border-radius: 50%;
  background: var(--surface); border: 1px solid var(--surface-brd); color: var(--text-dim);
  transition: transform .2s, color .2s, border-color .2s, background .2s;
}
.social-rail a:hover { color: var(--accent); border-color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); transform: translateY(-3px); }
@media (max-width: 1180px) { .social-rail { display: none; } }

/* ----------------------------------------------------------------- Marquee */
.marquee { overflow: hidden; border-block: 1px solid var(--surface-brd); background: var(--surface); padding: 16px 0; margin: 20px 0 10px; }
.marquee-track { display: flex; gap: 26px; width: max-content; animation: scroll-x 32s linear infinite; font-family: var(--font-head); font-weight: 600; color: var(--text-dim); }
.marquee-track span { white-space: nowrap; }
.marquee:hover .marquee-track { animation-play-state: paused; }
@keyframes scroll-x { to { transform: translateX(-50%); } }

/* ---------------------------------------------------------------- Sections */
.section { max-width: var(--maxw); margin: 0 auto; padding: clamp(64px, 10vh, 110px) clamp(18px, 4vw, 48px); }
.section-head { margin-bottom: 46px; max-width: 46rem; }
.kicker { font-family: var(--font-head); font-size: .8rem; font-weight: 700; letter-spacing: .12em; color: var(--accent); text-transform: uppercase; }
.section-head h2 { font-size: clamp(1.8rem, 4vw, 2.9rem); margin: 12px 0 0; letter-spacing: -.02em; }
.section-sub { color: var(--text-dim); margin-top: 14px; }

.glass { background: var(--surface); border: 1px solid var(--surface-brd); border-radius: var(--radius); backdrop-filter: blur(8px); }

/* About */
.about-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 40px; align-items: start; }
.about-text p { color: var(--text-dim); margin: 0 0 18px; }
.about-text strong { color: var(--text); }
.skill-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.skill-tags span { font-size: .85rem; padding: 7px 14px; border-radius: 999px; background: var(--surface); border: 1px solid var(--surface-brd); color: var(--text); }
.about-cards { display: grid; gap: 16px; }
.about-cards article { padding: 22px 24px; transition: transform .25s, border-color .25s; }
.about-cards article:hover { transform: translateY(-4px); border-color: var(--accent); }
.about-cards b { font-family: var(--font-head); color: var(--heading); font-size: 1.05rem; }
.about-cards p { margin: 8px 0 0; color: var(--text-dim); font-size: .94rem; }

/* Cards of 3 (services) */
.cards-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.service { padding: 32px 28px; transition: transform .25s, border-color .25s, box-shadow .25s; }
.service:hover { transform: translateY(-6px); border-color: var(--accent); box-shadow: var(--shadow); }
.service-ico { font-size: 2rem; display: block; margin-bottom: 16px; }
.service h3 { font-size: 1.25rem; margin: 0 0 10px; }
.service p { color: var(--text-dim); margin: 0; }

/* Process */
.process { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; counter-reset: step; }
.process li { position: relative; padding: 26px 22px; border-radius: var(--radius); border: 1px solid var(--surface-brd); background: var(--surface); }
.process .step { font-family: var(--font-head); font-size: 2rem; font-weight: 800; background: linear-gradient(120deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.process b { display: block; margin: 8px 0 6px; color: var(--heading); font-family: var(--font-head); }
.process p { margin: 0; color: var(--text-dim); font-size: .92rem; }

/* Timeline */
.timeline { position: relative; padding-left: 30px; }
.timeline::before { content: ""; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 2px; background: linear-gradient(var(--accent), transparent); }
.tl-item { position: relative; padding: 0 0 34px 24px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-dot { position: absolute; left: -30px; top: 4px; width: 16px; height: 16px; border-radius: 50%; background: var(--bg); border: 3px solid var(--accent); box-shadow: 0 0 0 4px var(--surface); }
.tl-dot-edu { border-color: var(--accent-2); }
.tl-date { font-size: .82rem; font-weight: 600; color: var(--accent); }
.tl-item h3 { font-size: 1.15rem; margin: 6px 0 6px; }
.tl-co { font-family: var(--font-body); font-weight: 500; font-size: .92rem; color: var(--text-dim); }
.tl-item p { margin: 0; color: var(--text-dim); }

/* Portfolio — App Store cards */
.apps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.app-card { display: flex; flex-direction: column; padding: 22px; transition: transform .25s, border-color .25s, box-shadow .25s; }
.app-card:hover { transform: translateY(-6px); border-color: var(--accent); box-shadow: var(--shadow); }
.app-card > img { width: 70px; height: 70px; border-radius: 18px; box-shadow: 0 8px 20px -6px rgba(0,0,0,.5); margin-bottom: 16px; }
.app-info { flex: 1; }
.app-info b { display: block; font-family: var(--font-head); color: var(--heading); font-size: 1.02rem; line-height: 1.25; }
.genre { display: inline-block; margin: 8px 0 10px; font-size: .72rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; color: var(--accent); background: color-mix(in srgb, var(--accent) 14%, transparent); border-radius: 999px; padding: 3px 10px; }
.app-info p { margin: 0; color: var(--text-dim); font-size: .9rem; line-height: 1.5; }
.app-cta { margin-top: 16px; font-size: .85rem; font-weight: 600; color: var(--accent); }
.apps-all { text-align: center; margin-top: 34px; }

/* Contact */
.contact-inner { padding: clamp(34px, 6vw, 64px); text-align: center; }
.contact-inner .section-head { margin: 0 auto 36px; }
.contact-actions { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; max-width: 760px; margin: 0 auto; }
.contact-card { display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 26px 18px; border-radius: var(--radius-sm); border: 1px solid var(--surface-brd); background: var(--bg-soft); transition: transform .2s, border-color .2s; }
.contact-card:hover { transform: translateY(-4px); border-color: var(--accent); }
.cc-ico { font-size: 1.7rem; font-weight: 800; }
.contact-card b { color: var(--heading); font-family: var(--font-head); }
.contact-card small { color: var(--text-dim); }

/* Footer */
.footer { border-top: 1px solid var(--surface-brd); margin-top: 40px; }
.footer-inner { max-width: var(--maxw); margin: 0 auto; padding: 30px clamp(18px, 4vw, 48px); display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; }
.footer-inner p { color: var(--text-dim); font-size: .88rem; margin: 0; }
.footer-social { display: flex; gap: 18px; list-style: none; padding: 0; margin: 0; font-size: .88rem; color: var(--text-dim); }
.footer-social a:hover { color: var(--accent); }

/* Floating WhatsApp */
.wa-float {
  position: fixed; right: 22px; bottom: 22px; z-index: 60; width: 56px; height: 56px; border-radius: 50%;
  display: grid; place-items: center; color: #fff; background: #25d366;
  box-shadow: 0 12px 30px -6px rgba(37, 211, 102, .6); transition: transform .2s;
  animation: bob 4s ease-in-out infinite;
}
.wa-float:hover { transform: scale(1.08); }

/* ------------------------------------------------------- Scroll reveal */
/* Guarded by .js so content is always visible if JavaScript fails to load. */
.js .reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.js .reveal.in { opacity: 1; transform: none; }

/* ----------------------------------------------------------- Responsive */
@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; text-align: center; padding-top: 120px; gap: 30px; }
  .hero-copy { order: 1; }
  .hero-visual { order: 2; }
  .photo-frame { max-width: 300px; }
  .hero-cta, .hero-stats { justify-content: center; }
  .lead { margin-inline: auto; }
  .about-grid { grid-template-columns: 1fr; }
  .cards-3, .process { grid-template-columns: repeat(2, 1fr); }
  .apps-grid { grid-template-columns: repeat(2, 1fr); }
  .float-card { display: none; }
}
/* Contact link lives in the hamburger menu only; the button covers desktop */
@media (min-width: 641px) { .nav-contact-link { display: none; } }

@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-actions .btn { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column; position: absolute; top: 70px; right: 16px; left: 16px;
    background: var(--bg-soft); border: 1px solid var(--surface-brd); border-radius: var(--radius); padding: 18px; gap: 16px; box-shadow: var(--shadow);
  }
  .nav-burger { display: flex; }
  .cards-3, .process, .contact-actions, .apps-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 20px; }
}

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