/* =========================================================
   MUHAMMAD AKRAM — 3D PORTFOLIO
   main.css — tokens, resets, layout primitives, nav, footer
========================================================= */

:root {
  /* Palette */
  --bg-1: #0a0e1a;
  --bg-2: #1a1f35;
  --text-primary: #ffffff;
  --text-secondary: #b0c4de;
  --cyan: #00f0ff;
  --purple: #b967ff;
  --gold: #ffd700;
  --gold-2: #ff6b00;

  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-bg-strong: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.1);

  /* Type */
  --font-display: 'Orbitron', sans-serif;
  --font-sub: 'Poppins', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Motion */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --dur: 0.3s;

  --header-h: 84px;
  --container: 1240px;
}

* , *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * , *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  background: var(--bg-1);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-sub);
  margin: 0;
  line-height: 1.15;
}

p { margin: 0; }

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

img { max-width: 100%; display: block; }

button {
  font-family: inherit;
  cursor: pointer;
  background: none;
  border: none;
  color: inherit;
}

ul { list-style: none; margin: 0; padding: 0; }

input, textarea {
  font-family: inherit;
  font-size: 1rem;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  padding: 0.75rem 1rem;
  width: 100%;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

input:focus, textarea:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.15);
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--cyan);
  color: #001014;
  padding: 0.75rem 1.25rem;
  z-index: 999;
  border-radius: 0 0 8px 0;
  font-weight: 600;
}
.skip-link:focus { left: 0; }

/* ---------- Background layers ---------- */
.bg-gradient {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(185, 103, 255, 0.18), transparent),
    radial-gradient(ellipse 60% 40% at 90% 20%, rgba(0, 240, 255, 0.10), transparent),
    linear-gradient(180deg, var(--bg-1) 0%, var(--bg-2) 50%, var(--bg-1) 100%);
}

#particle-canvas {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

/* ---------- Layout primitives ---------- */
.section {
  position: relative;
  padding: 7rem 0;
}

.section-alt {
  background: linear-gradient(180deg, transparent, rgba(255,255,255,0.02) 50%, transparent);
}

.section-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 2rem;
}

.section-eyebrow {
  font-family: var(--font-sub);
  font-weight: 600;
  color: var(--purple);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 4vw, 3.5rem);
  margin-bottom: 2.5rem;
  max-width: 720px;
}

.section-lead {
  color: var(--text-secondary);
  max-width: 560px;
  margin-top: -1.5rem;
  margin-bottom: 2.5rem;
  font-size: 1.05rem;
}

.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 2rem;
}

/* ---------- Reveal-on-scroll ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  border-radius: 12px;
  font-family: var(--font-sub);
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), background var(--dur) var(--ease);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--cyan), #009fb0);
  color: #00161a;
  box-shadow: 0 0 0 rgba(0, 240, 255, 0);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 240, 255, 0.35);
}
.btn-primary:active { transform: translateY(0) scale(0.98); }

.btn-glow { animation: pulse-glow 2.4s ease-in-out infinite; }
@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0, 240, 255, 0.35); }
  50% { box-shadow: 0 0 0 10px rgba(0, 240, 255, 0); }
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
}
.btn-outline:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translateY(-2px);
}

.btn-block { width: 100%; justify-content: center; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: rgba(10, 14, 26, 0.35);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.site-header.scrolled {
  background: rgba(10, 14, 26, 0.75);
  border-bottom-color: var(--glass-border);
}

.nav {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-right: auto;
}
.brand-logo { width: 34px; height: 34px; object-fit: contain; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong { font-family: var(--font-sub); font-size: 0.95rem; font-weight: 600; }
.brand-text small { font-size: 0.7rem; color: var(--text-secondary); }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  position: relative;
  font-family: var(--font-sub);
  font-size: 0.92rem;
  color: var(--text-secondary);
  padding: 0.4rem 0;
  transition: color var(--dur) var(--ease);
}
.nav-link::after {
  content: '';
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 2px;
  background: var(--cyan);
  transition: width var(--dur) var(--ease);
}
.nav-link:hover, .nav-link.active { color: var(--text-primary); }
.nav-link.active::after { width: 100%; }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.nav-login {
  padding: 0.6rem 1.1rem;
  font-size: 0.88rem;
}
.nav-cta { margin-left: 0.5rem; }
.mobile-only-link { display: none; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
}
.nav-toggle span {
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

/* ---------- Loader ---------- */
#loader {
  position: fixed;
  inset: 0;
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  background: var(--bg-1);
  transition: opacity 0.6s var(--ease), visibility 0.6s var(--ease);
}
#loader.hidden { opacity: 0; visibility: hidden; pointer-events: none; }

.loader-core { position: relative; width: 90px; height: 90px; }
.loader-ring {
  position: absolute; inset: 0;
  animation: spin 1.4s linear infinite;
}
.loader-ring circle {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-dasharray: 260;
  stroke-dashoffset: 200;
  filter: drop-shadow(0 0 6px var(--cyan));
}
.loader-logo {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 42px;
  height: 42px;
  object-fit: contain;
}
@keyframes spin { to { transform: rotate(360deg); } }

.loader-text {
  font-family: var(--font-display);
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  color: var(--text-secondary);
}
.dots span { animation: blink 1.4s infinite; }
.dots span:nth-child(2) { animation-delay: 0.2s; }
.dots span:nth-child(3) { animation-delay: 0.4s; }
@keyframes blink { 0%, 100% { opacity: 0.2; } 50% { opacity: 1; } }

.loader-bar {
  width: 180px;
  height: 3px;
  border-radius: 2px;
  background: rgba(255,255,255,0.08);
  overflow: hidden;
}
.loader-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--glass-border);
  padding: 3.5rem 0 1.75rem;
}
.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2.5rem;
}
.footer-col h4 {
  font-family: var(--font-sub);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--purple);
  margin-bottom: 1rem;
}
.footer-tagline {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.9rem;
  max-width: 280px;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}
.footer-links a {
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: color var(--dur) var(--ease);
}
.footer-links a:hover { color: var(--cyan); }

.footer-bottom {
  max-width: var(--container);
  margin: 2.5rem auto 0;
  padding: 1.5rem 2rem 0;
  border-top: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer-copy {
  font-size: 0.8rem;
  color: var(--text-secondary);
}
.back-to-top {
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  display: flex; align-items: center; justify-content: center;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.back-to-top:hover { border-color: var(--cyan); color: var(--cyan); transform: translateY(-3px); }

/* ---------- Floating WhatsApp button ---------- */
.whatsapp-float {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 90;
  width: 56px; height: 56px;
  border-radius: 50%;
  background: #25D366;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 20px rgba(37, 211, 102, 0.4);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
  animation: pulse-glow-wa 2.6s ease-in-out infinite;
}
.whatsapp-float:hover {
  transform: scale(1.08);
  box-shadow: 0 8px 28px rgba(37, 211, 102, 0.55);
}
@keyframes pulse-glow-wa {
  0%, 100% { box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.45), 0 6px 20px rgba(37, 211, 102, 0.4); }
  50% { box-shadow: 0 0 0 10px rgba(37, 211, 102, 0), 0 6px 20px rgba(37, 211, 102, 0.4); }
}