/* ============================================================
   Engineer The Sale — Stylesheet
   Design system tokens + all section styles
   ============================================================ */

/* ------------------------------------------------------------
   Custom Properties (Design Tokens)
   ------------------------------------------------------------ */
:root {
  /* Colors */
  --color-dominant: #0f0d0a;
  --color-secondary: #1a1714;
  --color-accent: #c9933a;
  --color-border: #2a2520;
  --color-text: #e8e0d5;
  --color-muted: #8a7e72;
  --color-destructive: #c0392b;

  /* Typography */
  --font-heading: 'Playfair Display', serif;
  --font-body: 'DM Sans', sans-serif;
  --size-display: 48px;
  --size-heading: 28px;
  --size-body: 16px;
  --size-label: 14px;
  --lh-display: 1.1;
  --lh-heading: 1.2;
  --lh-body: 1.6;
  --lh-label: 1.4;
  --ls-heading: -0.02em;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;
}

/* ------------------------------------------------------------
   Reset & Base
   ------------------------------------------------------------ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: var(--size-body);
  line-height: var(--lh-body);
  color: var(--color-text);
  background-color: var(--color-dominant);
}

/* ------------------------------------------------------------
   Typography
   ------------------------------------------------------------ */
h1 {
  font-family: var(--font-heading);
  font-size: var(--size-display);
  font-weight: 700;
  line-height: var(--lh-display);
  letter-spacing: var(--ls-heading);
}

h2 {
  font-family: var(--font-heading);
  font-size: var(--size-heading);
  font-weight: 700;
  line-height: var(--lh-heading);
  letter-spacing: var(--ls-heading);
  display: inline-block;
  margin-bottom: var(--space-xl);
}

h2::after {
  content: '';
  display: block;
  height: 4px;
  width: 60px;
  background: var(--color-accent);
  margin-top: var(--space-sm);
}

h3 {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  line-height: var(--lh-heading);
  margin-top: var(--space-sm);
  margin-bottom: var(--space-sm);
}

p {
  margin-bottom: var(--space-md);
}

p:last-child {
  margin-bottom: 0;
}

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

/* ------------------------------------------------------------
   Navigation (.site-nav)
   ------------------------------------------------------------ */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--color-secondary);
  padding: var(--space-md) var(--space-xl);
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
}

.nav-brand {
  color: var(--color-text);
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: -0.01em;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: var(--space-lg);
}

.nav-links a {
  color: var(--color-muted);
  text-decoration: none;
  padding: var(--space-sm) 0;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  font-size: var(--size-body);
  transition: color 0.2s ease;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav-toggle span {
  display: block;
  width: 25px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* ------------------------------------------------------------
   Hero (.hero)
   ------------------------------------------------------------ */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: var(--space-4xl) var(--space-xl);
}

.eyebrow {
  color: var(--color-accent);
  font-size: var(--size-label);
  font-family: var(--font-body);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-lg);
  display: block;
}

.hero h1 {
  margin-bottom: var(--space-lg);
  max-width: 700px;
}

.hero-subtext {
  max-width: 600px;
  color: var(--color-muted);
  margin-bottom: var(--space-xl);
  font-size: var(--size-body);
  line-height: var(--lh-body);
}

/* ------------------------------------------------------------
   CTA Button (.btn-primary)
   ------------------------------------------------------------ */
.btn-primary {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-dominant);
  font-family: var(--font-body);
  font-size: var(--size-body);
  font-weight: 400;
  padding: 12px 16px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  text-decoration: none;
  transition: opacity 0.2s ease;
  line-height: 1;
}

.btn-primary:hover {
  opacity: 0.9;
}

/* ------------------------------------------------------------
   Section Base (.section)
   ------------------------------------------------------------ */
.section {
  padding: var(--space-3xl) var(--space-xl);
  max-width: 1000px;
  margin: 0 auto;
}

/* ------------------------------------------------------------
   Scroll Reveal (.reveal)
   ------------------------------------------------------------ */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ------------------------------------------------------------
   Projects Grid (.projects-grid)
   ------------------------------------------------------------ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

/* ------------------------------------------------------------
   Project Card (.project-card)
   ------------------------------------------------------------ */
.project-card {
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: var(--space-lg);
}

.badge {
  font-size: var(--size-label);
  font-weight: 400;
  font-family: var(--font-body);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: inline-block;
}

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

.badge.coming-soon {
  color: var(--color-muted);
}

/* ------------------------------------------------------------
   Freelance Banner (.freelance-banner)
   ------------------------------------------------------------ */
.freelance-banner {
  text-align: center;
  padding: var(--space-3xl) var(--space-xl);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.freelance-banner p {
  color: var(--color-muted);
  max-width: 480px;
  margin: 0 auto;
}

/* ------------------------------------------------------------
   Contact Form (.contact-form)
   ------------------------------------------------------------ */
.contact-form {
  max-width: 500px;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

label {
  font-size: var(--size-label);
  color: var(--color-muted);
  font-family: var(--font-body);
}

input,
textarea {
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: var(--space-sm) var(--space-md);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--size-body);
  line-height: var(--lh-body);
  width: 100%;
  appearance: none;
}

input::placeholder,
textarea::placeholder {
  color: var(--color-muted);
  opacity: 0.6;
}

input:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

textarea {
  resize: vertical;
  min-height: 120px;
}

/* Honeypot — hidden from humans */
.honeypot-field {
  display: none;
}

/* Inline validation error text */
.field-error {
  color: var(--color-destructive);
  font-size: var(--size-label);
  line-height: var(--lh-label);
}

/* Error-state input border */
.form-group input.input-error,
.form-group textarea.input-error {
  border-color: var(--color-destructive);
}

/* Success message below form */
.form-success {
  display: none;
  color: var(--color-text);
  font-size: var(--size-body);
  margin-top: var(--space-lg);
}

/* API error message below form */
.form-error {
  display: none;
  color: var(--color-destructive);
  font-size: var(--size-body);
  margin-top: var(--space-lg);
}

/* Submit button disabled/loading state */
.btn-primary:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

/* ------------------------------------------------------------
   Footer (.site-footer)
   ------------------------------------------------------------ */
.site-footer {
  background: var(--color-secondary);
  color: var(--color-muted);
  padding: var(--space-2xl) var(--space-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--color-border);
  font-size: var(--size-label);
}

.site-footer .nav-links {
  gap: var(--space-lg);
}

.site-footer .nav-links a {
  font-size: var(--size-label);
  min-height: unset;
  padding: 0;
}

/* ------------------------------------------------------------
   Mobile Breakpoint (max-width: 768px)
   ------------------------------------------------------------ */
@media (max-width: 768px) {
  /* Navigation */
  .nav-links {
    display: none;
  }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--color-secondary);
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border);
    gap: 0;
  }

  .nav-links.open a {
    padding: var(--space-sm) var(--space-md);
    width: 100%;
    min-height: 44px;
  }

  .nav-toggle {
    display: flex;
  }

  /* Typography */
  h1 {
    font-size: 36px;
  }

  /* Projects */
  .projects-grid {
    grid-template-columns: 1fr;
  }

  /* Footer */
  .site-footer {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }

  .site-footer .nav-links {
    justify-content: center;
  }
}