/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --dark:         #0d1f3c;
  --dark-2:       #152d5a;
  --accent:       #00a8cc;
  --accent-hover: #008fb0;
  --light-bg:     #f4f7fb;
  --white:        #ffffff;
  --text:         #2d3748;
  --text-muted:   #718096;
  --border:       #dde3ed;
  --font:         'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --max-w:        1100px;
  --radius:       8px;
  --section-v:    90px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--text);
  line-height: 1.65;
  background: var(--white);
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.accent { color: var(--accent); }

/* ===== NAV ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--dark);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-logo {
  height: 38px;
  width: 38px;
  flex-shrink: 0;
}

.nav-brand-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.brand-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.brand-tagline {
  font-size: 0.72rem;
  color: rgba(255, 255, 255, 0.4);
  letter-spacing: 0.04em;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 36px;
}

.nav-links a {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.15s;
}

.nav-links a:hover { color: var(--accent); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: white;
  font-size: 1.4rem;
  cursor: pointer;
  padding: 4px 8px;
  line-height: 1;
}

/* ===== HERO ===== */
.hero {
  background: linear-gradient(145deg, var(--dark) 0%, var(--dark-2) 100%);
  color: var(--white);
  padding: 110px 24px 100px;
  text-align: center;
}

.hero-logo {
  width: 72px;
  height: 72px;
  max-width: 72px;
  margin-bottom: 20px;
  filter: drop-shadow(0 4px 16px rgba(0,0,0,0.4));
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(2.1rem, 5.5vw, 3.6rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.025em;
  margin-bottom: 24px;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

.hero-sub {
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  color: rgba(255, 255, 255, 0.68);
  max-width: 620px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

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

/* ===== BUTTONS ===== */
.btn {
  display: inline-block;
  padding: 13px 30px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.97rem;
  cursor: pointer;
  transition: background 0.18s, color 0.18s, transform 0.12s, box-shadow 0.18s;
  border: 2px solid transparent;
  line-height: 1;
}

.btn-primary {
  background: var(--accent);
  color: var(--white);
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0, 168, 204, 0.3);
}

.btn-ghost {
  background: transparent;
  color: rgba(255, 255, 255, 0.8);
  border-color: rgba(255, 255, 255, 0.25);
}

.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.6);
  color: var(--white);
}

/* ===== SECTIONS ===== */
.section { padding: var(--section-v) 24px; }
.section-light { background: var(--light-bg); }
.section-dark  { background: var(--dark); color: var(--white); }

.section h2 {
  font-size: clamp(1.6rem, 4vw, 2.3rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.section-sub {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 44px;
  max-width: 580px;
  line-height: 1.65;
}

.section-dark h2   { color: var(--white); }
.section-dark .section-sub { color: rgba(255,255,255,0.55); }

/* ===== ABOUT ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 64px;
  align-items: start;
  margin-top: 36px;
}

.about-text p {
  margin-bottom: 18px;
  font-size: 1.03rem;
  color: var(--text);
  line-height: 1.78;
}

.about-text p:last-child { margin-bottom: 0; }

.about-stats {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.stat {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
}

.stat-number {
  display: block;
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 10px;
  letter-spacing: -0.03em;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}

/* ===== SERVICES ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 20px;
  margin-top: 0;
}

.service-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: var(--radius);
  padding: 32px 26px;
  transition: background 0.2s, transform 0.18s;
}

.service-card:hover {
  background: rgba(255, 255, 255, 0.07);
  transform: translateY(-3px);
}

.service-icon {
  font-size: 1.9rem;
  margin-bottom: 16px;
  line-height: 1;
}

.service-card h3 {
  font-size: 1.08rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--accent);
}

.service-card p {
  font-size: 0.93rem;
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.68;
}

/* ===== PROJECTS ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.project-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
  transition: box-shadow 0.2s, transform 0.18s;
}

.project-card:hover {
  box-shadow: 0 6px 20px rgba(0,0,0,0.09);
  transform: translateY(-2px);
}

.project-card--github {
  border-color: var(--accent);
  background: rgba(0, 168, 204, 0.03);
}

.project-title-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.project-title-row h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--dark);
  margin: 0;
}

.project-badges {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-lang  { background: #e8f4fd; color: #1a6fa8; }
.badge-oss   { background: #e6f7ee; color: #1a7a40; }
.badge-self  { background: #fdf3e6; color: #9a5a00; }

.project-desc {
  font-size: 0.93rem;
  color: var(--text-muted);
  line-height: 1.68;
  margin: 0;
}

.project-footer {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.project-tech {
  font-size: 0.8rem;
  color: #a0aec0;
  letter-spacing: 0.01em;
}

.project-links {
  display: flex;
  gap: 16px;
}

.project-links a {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
}

.project-links a:hover { color: var(--accent-hover); }

/* ===== CONTACT ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 64px;
  align-items: start;
  margin-top: 0;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.87rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.01em;
}

.form-group input,
.form-group textarea {
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.97rem;
  font-family: inherit;
  background: var(--white);
  color: var(--text);
  transition: border-color 0.18s, box-shadow 0.18s;
  appearance: none;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 168, 204, 0.14);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: #a0aec0;
}

.form-group textarea {
  resize: vertical;
  min-height: 130px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 28px;
  padding-top: 4px;
}

.contact-detail {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.contact-detail strong {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
  font-weight: 700;
}

.contact-detail a,
.contact-detail span {
  font-size: 0.97rem;
  color: var(--text);
}

.contact-detail a:hover { color: var(--accent); }

/* ===== FOOTER ===== */
.site-footer {
  background: var(--dark);
  padding: 30px 24px;
  text-align: center;
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-copy {
  color: rgba(255, 255, 255, 0.4);
  font-size: 0.88rem;
}

.footer-domain {
  color: rgba(255, 255, 255, 0.25);
  font-size: 0.8rem;
}

/* ===== FORM SUCCESS ===== */
.form-success {
  font-size: 1.05rem;
  color: var(--accent);
  padding: 20px;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  background: rgba(0, 168, 204, 0.06);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 800px) {
  .nav-links        { display: none; }
  .nav-toggle       { display: block; }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--dark);
    border-top: 1px solid rgba(255,255,255,0.08);
    padding: 8px 0;
  }

  .nav-links.open li a {
    display: block;
    padding: 14px 24px;
    font-size: 1rem;
  }

  .about-grid,
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }

  .about-stats   { flex-direction: row; }

  .hero          { padding: 72px 24px 64px; }
}

@media (max-width: 540px) {
  .form-row      { grid-template-columns: 1fr; }
  .about-stats   { flex-direction: column; }
}