:root {
  --navy-950: #050b1f;
  --navy-900: #0a1330;
  --navy-800: #0f1b3d;
  --navy-700: #16244d;
  --navy-600: #1e2f63;
  --blue-500: #3b82f6;
  --blue-400: #60a5fa;
  --blue-300: #93c5fd;
  --cyan-400: #22d3ee;
  --text-main: #e8ecfb;
  --text-muted: #93a0c4;
  --border-soft: rgba(147, 165, 220, 0.14);
  --shadow-glow: 0 0 60px rgba(59, 130, 246, 0.25);
  --radius: 16px;
  --font-heading: 'Poppins', sans-serif;
  --font-body: 'Inter', sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--navy-950);
  color: var(--text-main);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    radial-gradient(circle at 15% 10%, rgba(59, 130, 246, 0.18), transparent 45%),
    radial-gradient(circle at 85% 30%, rgba(34, 211, 238, 0.12), transparent 40%),
    linear-gradient(var(--border-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-soft) 1px, transparent 1px);
  background-size: auto, auto, 48px 48px, 48px 48px;
  background-color: var(--navy-950);
  mask-image: linear-gradient(to bottom, black, black 60%, transparent 100%);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(5, 11, 31, 0.7);
  border-bottom: 1px solid var(--border-soft);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(0.85rem, 1.6vw, 1.1rem);
  color: var(--text-main);
  text-decoration: none;
  letter-spacing: 0.3px;
  white-space: nowrap;
}
.logo span { color: var(--blue-400); }

.header-right {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav { display: flex; gap: 32px; }
.nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s ease;
}
.nav a:hover { color: var(--blue-300); }

.datetime {
  font-family: var(--font-body);
  font-size: 0.82rem;
  color: var(--blue-300);
  white-space: nowrap;
  border-left: 1px solid var(--border-soft);
  padding-left: 20px;
}

/* Hero */
.hero {
  position: relative;
  padding: 140px 0 100px;
  text-align: center;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.35), transparent 65%);
  z-index: -1;
  filter: blur(10px);
}

.eyebrow {
  color: var(--blue-400);
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  font-size: 0.8rem;
  margin-bottom: 16px;
}
.eyebrow.center { text-align: center; }

.hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  font-weight: 700;
  max-width: 820px;
  margin: 0 auto 24px;
  line-height: 1.25;
}

.highlight {
  background: linear-gradient(90deg, var(--blue-400), var(--cyan-400));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  max-width: 600px;
  margin: 0 auto 40px;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 14px 30px;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  font-size: 0.95rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn-primary {
  background: linear-gradient(90deg, var(--blue-500), var(--cyan-400));
  color: var(--navy-950);
  box-shadow: var(--shadow-glow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 80px rgba(59, 130, 246, 0.4); }

.btn-ghost {
  color: var(--text-main);
  border: 1px solid var(--border-soft);
  background: rgba(255, 255, 255, 0.02);
}
.btn-ghost:hover { border-color: var(--blue-400); color: var(--blue-300); transform: translateY(-2px); }

/* Stats */
.stats { padding: 20px 0 80px; }
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.stat-card {
  background: linear-gradient(180deg, var(--navy-800), var(--navy-900));
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
}
.stat-number {
  display: block;
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 700;
  background: linear-gradient(90deg, var(--blue-400), var(--cyan-400));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat-label {
  display: block;
  margin-top: 6px;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Section titles */
.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 12px;
}
.section-title.center { text-align: center; }
.section-sub {
  color: var(--text-muted);
  max-width: 520px;
  margin: 0 auto 48px;
}
.section-sub.center { text-align: center; }

/* Projects */
.projects { padding: 60px 0 100px; }

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.project-card {
  display: block;
  background: linear-gradient(180deg, var(--navy-800), var(--navy-900));
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.project-card:hover {
  transform: translateY(-6px);
  border-color: rgba(96, 165, 250, 0.4);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4), 0 0 40px rgba(59, 130, 246, 0.15);
}

.project-thumb {
  position: relative;
  height: 190px;
  overflow: hidden;
}
.project-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}
.project-card:hover .project-thumb img { transform: scale(1.08); }

.project-thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(5, 11, 31, 0.85) 100%);
}

.project-tag {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 2;
  background: rgba(5, 11, 31, 0.75);
  backdrop-filter: blur(6px);
  border: 1px solid var(--border-soft);
  color: var(--blue-300);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  padding: 5px 12px;
  border-radius: 999px;
}

.project-body { padding: 24px; }
.project-body h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  margin-bottom: 10px;
}
.project-body p {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-bottom: 18px;
}

.project-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.project-tags li {
  font-size: 0.72rem;
  color: var(--blue-300);
  border: 1px solid var(--border-soft);
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(59, 130, 246, 0.06);
}

/* Stack */
.stack { padding: 40px 0 100px; }
.stack-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.stack-item {
  text-align: center;
  padding: 30px 16px;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.015);
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.stack-item:hover { border-color: rgba(96, 165, 250, 0.4); transform: translateY(-4px); }
.stack-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--blue-500), var(--cyan-400));
  color: var(--navy-950);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 16px;
}
.stack-item p { color: var(--text-muted); font-size: 0.85rem; }

/* Contact */
.contact {
  padding: 80px 0;
  text-align: center;
  border-top: 1px solid var(--border-soft);
}
.contact h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin-bottom: 12px;
}
.contact p { color: var(--text-muted); margin-bottom: 32px; }

/* Contact form */
.contact-form {
  max-width: 560px;
  margin: 0 auto 24px;
  text-align: left;
  background: linear-gradient(180deg, var(--navy-800), var(--navy-900));
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 32px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group { margin-bottom: 18px; }

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border-soft);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: 0.95rem;
  resize: vertical;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--blue-400);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.hp-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.contact-form .btn { width: 100%; border: none; cursor: pointer; }
.contact-form .btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

.form-status {
  margin-top: 14px;
  font-size: 0.9rem;
  text-align: center;
  min-height: 1.2em;
}
.form-status.success { color: #4ade80; }
.form-status.error { color: #f87171; }

.contact-alt { color: var(--text-muted); font-size: 0.9rem; }
.contact-alt a { color: var(--blue-300); }

@media (max-width: 600px) {
  .form-row { grid-template-columns: 1fr; }
  .contact-form { padding: 24px; }
}

/* Footer */
.site-footer {
  padding: 28px 0;
  border-top: 1px solid var(--border-soft);
  text-align: center;
}
.site-footer p { color: var(--text-muted); font-size: 0.85rem; }

/* Scroll reveal */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 900px) {
  .project-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stack-grid { grid-template-columns: repeat(2, 1fr); }
  .nav { display: none; }
}