:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f6f8fb;
  --color-text: #14181f;
  --color-text-muted: #5b6472;
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-border: #e5e9f0;
  --radius: 14px;
  --max-width: 1140px;
  --shadow: 0 10px 30px -12px rgba(20, 24, 31, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

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

h1, h2, h3 {
  line-height: 1.2;
  margin: 0 0 16px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

p {
  margin: 0 0 16px;
  color: var(--color-text-muted);
}

/* HEADER */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo {
  font-size: 20px;
  font-weight: 800;
  color: var(--color-text);
}

.logo span {
  color: var(--color-primary);
}

.nav {
  display: flex;
  gap: 32px;
}

.nav a {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color 0.2s ease;
}

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

.nav-cta {
  display: inline-flex;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 8px 20px -8px rgba(37, 99, 235, 0.55);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* HERO */
.hero {
  padding: 120px 0 100px;
  background:
    radial-gradient(60% 50% at 80% 0%, rgba(37, 99, 235, 0.10), transparent 70%),
    var(--color-bg);
}

.hero-inner {
  max-width: 760px;
}

.eyebrow,
.section-eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.hero h1 {
  font-size: clamp(36px, 5vw, 56px);
}

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

.hero-sub {
  font-size: 18px;
  max-width: 560px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-top: 32px;
  flex-wrap: wrap;
}

/* SECTIONS */
.section {
  padding: 96px 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section h2 {
  font-size: clamp(28px, 3.5vw, 38px);
  max-width: 640px;
}

.section-sub {
  max-width: 560px;
  font-size: 17px;
  margin-bottom: 48px;
}

/* CARDS */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.card-icon {
  font-size: 24px;
  margin-bottom: 16px;
  color: var(--color-primary);
}

.card h3 {
  font-size: 19px;
  margin-bottom: 8px;
}

.card p {
  margin: 0;
  font-size: 15px;
}

/* ABOUT */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 64px;
  align-items: center;
}

.about-list li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 12px;
  color: var(--color-text);
  font-weight: 500;
}

.about-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 700;
}

.about-stats {
  display: grid;
  gap: 24px;
}

.stat {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 32px;
  font-weight: 800;
  color: var(--color-primary);
}

.stat-label {
  display: block;
  margin-top: 6px;
  font-size: 14px;
  color: var(--color-text-muted);
}

/* PORTFOLIO */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.portfolio-item {
  aspect-ratio: 4 / 3;
  border-radius: var(--radius);
  background: var(--color-bg-alt);
  border: 1px dashed var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 14px;
  font-weight: 500;
}

/* CONTACT */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 64px;
  align-items: start;
}

.contact-details {
  margin-top: 24px;
}

.contact-details li {
  margin-bottom: 10px;
  color: var(--color-text);
  font-size: 15px;
}

.contact-form {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
}

.form-row {
  margin-bottom: 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-row label {
  font-size: 14px;
  font-weight: 600;
}

.form-row input,
.form-row textarea {
  font-family: inherit;
  font-size: 15px;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--color-border);
  background: var(--color-bg-alt);
  resize: vertical;
}

.form-row input:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  background: #fff;
}

.form-submit {
  width: 100%;
  border: none;
}

.form-note {
  margin: 12px 0 0;
  font-size: 14px;
  text-align: center;
}

.form-note.success {
  color: #16a34a;
}

/* FOOTER */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 32px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-inner p {
  margin: 0;
  font-size: 14px;
}

/* RESPONSIVE */
@media (max-width: 900px) {
  .cards {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .portfolio-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 720px) {
  .nav,
  .nav-cta {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .nav.open {
    display: flex;
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 16px 24px;
    gap: 16px;
  }

  .cards,
  .portfolio-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 80px 0 64px;
  }

  .section {
    padding: 64px 0;
  }
}