/* ========================================
   CSS Custom Properties
   ======================================== */

:root {
  /* Colors */
  --bg: #fafaf8;
  --text: #1a1a1a;
  --accent: #c85a3a;
  --gray: #636363;
  --gray-light: #737373;
  --gray-border: #ddd;


  /* Typography */
  --font-serif: "DM Serif Display", Georgia, serif;
  --font-sans: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  /* Spacing */
  --section-pad: 100px;
  --container-width: 1100px;
  --text-max-width: 640px;

  /* Transitions */
  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ========================================
   Reset & Base
   ======================================== */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
  list-style: none;
}

/* ========================================
   Utility
   ======================================== */

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

.section-label {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--gray);
  margin-bottom: 48px;
}

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

/* Fade-in on scroll */
.fade-in {
  opacity: 0;
  transition: opacity 0.8s var(--ease);
}

.fade-in.visible {
  opacity: 1;
}

/* ========================================
   Navbar
   ======================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 20px 0;
  transition: background-color 0.3s var(--ease), box-shadow 0.3s var(--ease), padding 0.3s var(--ease);
}

.navbar.scrolled {
  background-color: var(--bg);
  box-shadow: 0 1px 0 var(--gray-border);
  padding: 14px 0;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-brand {
  font-family: var(--font-serif);
  font-size: 22px;
  letter-spacing: -0.5px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s var(--ease);
}

.navbar.scrolled .navbar-brand {
  opacity: 1;
  pointer-events: auto;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.navbar-links a {
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--gray);
  transition: color 0.2s var(--ease);
}

.navbar-links a:hover,
.navbar-links a:focus-visible {
  color: var(--text);
}


.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--bg) !important;
  background-color: var(--text);
  padding: 0 20px;
  border-radius: 2px;
  transition: background-color 0.2s var(--ease);
}

.nav-cta:hover,
.nav-cta:focus-visible {
  background-color: var(--accent);
  color: #fff !important;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  width: 28px;
}

.hamburger span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--text);
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}

.hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ========================================
   Hero
   ======================================== */

.hero {
  padding: 180px 0 var(--section-pad);
  min-height: 80vh;
  display: flex;
  align-items: center;
}

.hero-content {
  max-width: var(--text-max-width);
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: 68px;
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -2px;
  margin-bottom: 20px;
}

.hero .tagline {
  font-size: 14px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--gray);
  margin-bottom: 32px;
}

.hero .intro {
  font-size: 17px;
  line-height: 1.8;
  color: var(--gray);
  margin-bottom: 48px;
}

.btn-primary {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--bg);
  background-color: var(--text);
  padding: 16px 36px;
  border: none;
  border-radius: 2px;
  cursor: pointer;
  transition: background-color 0.2s var(--ease);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: var(--accent);
  color: #fff;
}

/* ========================================
   Services
   ======================================== */

.services {
  padding: var(--section-pad) 0;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.service-card {
  padding: 36px;
  border: 1px solid var(--gray-border);
  border-radius: 2px;
  transition: border-color 0.2s var(--ease);
}

.service-card:hover {
  border-color: var(--gray);
}

.service-icon {
  width: 32px;
  height: 32px;
  margin-bottom: 20px;
  color: var(--text);
}

.service-icon svg {
  width: 100%;
  height: 100%;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.service-card h2 {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 400;
  letter-spacing: -0.5px;
  margin-bottom: 12px;
}

.service-card p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--gray);
  margin-bottom: 16px;
}

.service-tech {
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--gray);
}

/* ========================================
   About
   ======================================== */

.about {
  padding: var(--section-pad) 0;
}

.about-text {
  max-width: var(--text-max-width);
  font-size: 17px;
  line-height: 1.8;
  color: var(--gray);
}

/* ========================================
   Contact
   ======================================== */

.contact {
  padding: var(--section-pad) 0;
}

.contact-form {
  max-width: var(--text-max-width);
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--gray);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  font-family: var(--font-sans);
  font-size: 16px;
  padding: 12px 0;
  border: none;
  border-bottom: 1px solid var(--gray-border);
  background: transparent;
  color: var(--text);
  outline: none;
  transition: border-color 0.2s var(--ease);
}

.form-group input:focus,
.form-group textarea:focus {
  border-bottom-color: var(--text);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--gray-light);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.7;
}

.contact-alt {
  margin-top: 48px;
  max-width: var(--text-max-width);
}

.contact-alt p {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--gray);
  margin-bottom: 12px;
}

.contact-links {
  display: flex;
  gap: 24px;
}

.contact-links a {
  font-size: 15px;
  color: var(--gray);
  transition: color 0.2s var(--ease);
}

.contact-links a:hover,
.contact-links a:focus-visible {
  color: var(--text);
}

/* ========================================
   Footer
   ======================================== */

.footer {
  padding: 48px 0;
  border-top: 1px solid var(--gray-border);
}

.footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-copy {
  font-size: 13px;
  color: var(--gray-light);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 13px;
  color: var(--gray-light);
  transition: color 0.2s var(--ease);
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--text);
}

/* ========================================
   Mobile Nav Overlay
   ======================================== */

.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 99;
  background-color: var(--bg);
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: 0 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s var(--ease);
}

.mobile-nav.open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav a {
  font-family: var(--font-serif);
  font-size: 36px;
  letter-spacing: -1px;
  display: block;
  margin-bottom: 24px;
  color: var(--text);
}


/* ========================================
   Responsive
   ======================================== */

@media (max-width: 768px) {
  :root {
    --section-pad: 64px;
  }

  .navbar-links {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .mobile-nav {
    display: flex;
  }

  .hero {
    padding: 140px 0 var(--section-pad);
    min-height: auto;
  }

  .hero h1 {
    font-size: 40px;
    letter-spacing: -1px;
  }

  .hero .tagline {
    font-size: 13px;
  }

  .hero .intro {
    font-size: 17px;
  }

  .services-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .service-card {
    padding: 28px;
  }

  .section-label {
    margin-bottom: 32px;
  }

  .footer .container {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ========================================
   Focus States (Accessibility)
   ======================================== */

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

input:focus-visible,
textarea:focus-visible {
  outline: none;
}