/* ==========================================================
   SWANSON SEO — Stylesheet
   Dark & bold theme, mobile-first responsive, CSS custom properties
   ========================================================== */

/* ==========================================================
   1. CUSTOM PROPERTIES
   ========================================================== */
:root {
  /* Dark backgrounds */
  --color-bg-primary: #0b1120;
  --color-bg-secondary: #111827;
  --color-bg-card: #1a2332;
  --color-bg-card-hover: #1f2b3d;

  /* Accent — Cyan/Teal (punchy on dark) */
  --color-accent: #06b6d4;
  --color-accent-light: #22d3ee;
  --color-accent-dark: #0891b2;
  --color-accent-glow: rgba(6, 182, 212, 0.15);

  /* Text on dark */
  --color-text-primary: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  --color-text-inverse: #0f172a;

  /* Borders & surfaces */
  --color-border: rgba(148, 163, 184, 0.12);
  --color-border-accent: rgba(6, 182, 212, 0.3);

  /* Functional */
  --color-success: #22c55e;
  --color-error: #ef4444;
  --color-white: #ffffff;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Typography — SYSTEM FONTS ONLY */
  --font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --text-sm: clamp(0.875rem, 0.8rem + 0.25vw, 0.9375rem);
  --text-base: clamp(1rem, 0.95rem + 0.2vw, 1.0625rem);
  --text-lg: clamp(1.125rem, 1rem + 0.4vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1.1rem + 0.5vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.2rem + 0.8vw, 2rem);
  --text-3xl: clamp(1.875rem, 1.4rem + 1.2vw, 2.5rem);
  --text-4xl: clamp(2.25rem, 1.6rem + 1.8vw, 3.25rem);
  --text-5xl: clamp(2.75rem, 2rem + 2.2vw, 4rem);

  /* Layout */
  --max-width: 1200px;
  --header-height: 72px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;

  /* Shadows — tuned for dark theme */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px var(--color-accent-glow);

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-family);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text-secondary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  color: var(--color-accent-light);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-primary);
  line-height: 1.2;
  font-weight: 700;
}

/* ==========================================================
   3. LAYOUT
   ========================================================== */
.container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-lg);
}

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

.section-header {
  text-align: center;
  max-width: 700px;
  margin-inline: auto;
  margin-bottom: var(--space-3xl);
}

.section-title {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-md);
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ==========================================================
   4. BUTTONS
   ========================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--text-base);
  font-family: var(--font-family);
  text-decoration: none;
  transition: all var(--transition-base);
  cursor: pointer;
  border: 2px solid transparent;
  line-height: 1.4;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-text-inverse);
  border-color: var(--color-accent);
  font-weight: 700;
}

.btn-primary:hover {
  background: var(--color-accent-light);
  border-color: var(--color-accent-light);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-glow);
}

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

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ==========================================================
   5. HEADER & NAVIGATION
   ========================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(11, 17, 32, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition-base);
  height: var(--header-height);
}

.site-header.scrolled {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-text-primary);
  font-size: var(--text-xl);
  font-weight: 700;
  text-decoration: none;
  z-index: 1001;
}

.logo:hover {
  color: var(--color-accent-light);
}

.logo-icon {
  display: flex;
  color: var(--color-accent);
}

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

/* Hamburger */
.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  z-index: 1001;
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile nav */
.main-nav {
  position: fixed;
  top: 0;
  right: -100%;
  width: 80%;
  max-width: 320px;
  height: 100vh;
  height: 100dvh;
  background: var(--color-bg-secondary);
  box-shadow: var(--shadow-lg);
  padding: calc(var(--header-height) + var(--space-xl)) var(--space-xl) var(--space-xl);
  transition: right var(--transition-base);
  overflow-y: auto;
}

.main-nav.open {
  right: 0;
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.nav-link {
  display: block;
  padding: var(--space-sm) var(--space-md);
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: var(--text-lg);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.nav-link:hover {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--color-accent);
}

.nav-cta {
  background-color: var(--color-accent);
  color: var(--color-text-inverse) !important;
  text-align: center;
  border-radius: var(--radius-md);
  margin-top: var(--space-sm);
}

.nav-cta:hover {
  background-color: var(--color-accent-light);
}

/* Overlay */
.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.nav-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* ==========================================================
   6. HERO
   ========================================================== */
.hero {
  padding: calc(var(--header-height) + var(--space-4xl)) 0 var(--space-4xl);
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, var(--color-accent-glow), transparent),
    var(--color-bg-primary);
  color: var(--color-text-primary);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-inner {
  max-width: 800px;
  margin-inline: auto;
}

.hero-kicker {
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.hero-heading {
  font-size: var(--text-5xl);
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
  letter-spacing: -0.03em;
  font-weight: 800;
}

.hero-sub {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2xl);
  line-height: 1.7;
  max-width: 640px;
  margin-inline: auto;
}

.hero-ctas {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  align-items: center;
}

.hero-ctas .btn-primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-text-inverse);
  font-weight: 700;
  font-size: var(--text-lg);
  padding: 0.9rem 2.25rem;
}

.hero-ctas .btn-primary:hover {
  background: var(--color-accent-light);
  border-color: var(--color-accent-light);
  box-shadow: var(--shadow-glow);
}

.hero-ctas .btn-secondary {
  color: var(--color-text-secondary);
  border-color: var(--color-border);
}

.hero-ctas .btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: rgba(6, 182, 212, 0.05);
}

/* ==========================================================
   7. SERVICES
   ========================================================== */
.services {
  padding: var(--space-4xl) 0;
}

.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.service-card {
  position: relative;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  transition: box-shadow var(--transition-base), transform var(--transition-base), border-color var(--transition-base);
}

.service-card:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-3px);
  border-color: var(--color-border-accent);
}

.service-card--featured {
  border-color: var(--color-accent);
  border-width: 2px;
  background: linear-gradient(135deg, var(--color-bg-card), rgba(6, 182, 212, 0.05));
}

.service-badge {
  position: absolute;
  top: calc(-0.6rem);
  left: var(--space-xl);
  background: var(--color-accent);
  color: var(--color-text-inverse);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.2rem 0.75rem;
  border-radius: 100px;
}

.service-icon {
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.service-title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-sm);
}

.service-desc {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ==========================================================
   8. ABOUT
   ========================================================== */
.about {
  padding: var(--space-4xl) 0;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
}

.headshot {
  width: 100%;
  max-width: 320px;
  height: auto;
  margin-inline: auto;
  border-radius: var(--radius-lg);
  object-fit: cover;
  box-shadow: 0 0 30px rgba(6, 182, 212, 0.1);
  border: 2px solid var(--color-border);
}

.about-content p {
  margin-bottom: var(--space-md);
  color: var(--color-text-secondary);
}

.about-content p:last-of-type {
  margin-bottom: var(--space-xl);
}

.credentials {
  margin-top: var(--space-xl);
}

.credentials-title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-md);
  color: var(--color-accent);
}

.credentials-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.credentials-list li {
  display: flex;
  flex-direction: column;
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
}

.credential-role {
  font-weight: 600;
  color: var(--color-text-primary);
}

.credential-company {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

/* ==========================================================
   9. PROCESS
   ========================================================== */
.process {
  padding: var(--space-4xl) 0;
}

.process-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.process-step {
  position: relative;
  padding-left: 4rem;
}

.step-number {
  position: absolute;
  left: 0;
  top: 0;
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: var(--color-text-inverse);
  font-weight: 700;
  font-size: var(--text-lg);
  border-radius: 50%;
}

.step-title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-sm);
}

.step-desc {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ==========================================================
   10. RESULTS
   ========================================================== */
.results {
  padding: var(--space-4xl) 0;
}

.stats-bar {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-3xl);
}

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

.stat-number {
  display: block;
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1.1;
  margin-bottom: var(--space-xs);
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: 500;
}

.results-cta {
  text-align: center;
}

.results-cta-text {
  font-size: var(--text-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  font-weight: 500;
}

/* ==========================================================
   11. CONTACT
   ========================================================== */
.contact {
  padding: var(--space-4xl) 0;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
}

/* Form */
.form-honeypot {
  position: absolute;
  left: -9999px;
  height: 0;
  overflow: hidden;
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}

.required {
  color: var(--color-error);
}

.form-input,
.form-select {
  width: 100%;
  padding: 0.7rem var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: var(--text-base);
  color: var(--color-text-primary);
  background: var(--color-bg-card);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-select:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-glow);
  outline: none;
}

.form-input::placeholder {
  color: var(--color-text-muted);
}

.form-input.error {
  border-color: var(--color-error);
}

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

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3E%3Cpath d='M4 6l4 4 4-4' fill='none' stroke='%2394a3b8' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2.5rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.form-checkboxes {
  border: none;
}

.form-checkboxes legend {
  margin-bottom: var(--space-sm);
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) 0;
  cursor: pointer;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.checkbox-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--color-accent);
  cursor: pointer;
}

.btn-submit {
  width: 100%;
  padding: 0.85rem var(--space-xl);
  font-size: var(--text-lg);
}

.btn-submit:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.form-status {
  margin-top: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  font-weight: 500;
  display: none;
}

.form-status.success {
  display: block;
  background: rgba(34, 197, 94, 0.1);
  color: var(--color-success);
  border: 1px solid rgba(34, 197, 94, 0.2);
}

.form-status.error {
  display: block;
  background: rgba(239, 68, 68, 0.1);
  color: var(--color-error);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Contact info sidebar */
.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.contact-detail h3 {
  font-size: var(--text-base);
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.contact-detail address {
  font-style: normal;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.contact-detail p {
  color: var(--color-text-secondary);
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-accent);
  font-weight: 500;
}

.contact-link:hover {
  color: var(--color-accent-light);
}

.contact-link svg {
  flex-shrink: 0;
}

/* ==========================================================
   12. FOOTER
   ========================================================== */
.site-footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  padding: var(--space-2xl) 0;
  text-align: center;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm) var(--space-lg);
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: color var(--transition-fast);
}

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

.footer-social a {
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.footer-social a:hover {
  color: var(--color-accent-light);
}

.footer-copy {
  font-size: var(--text-sm);
}

.footer-note {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* ==========================================================
   13. SCROLL ANIMATIONS
   ========================================================== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .fade-in {
    opacity: 1;
    transform: none;
  }
}

/* ==========================================================
   14. RESPONSIVE — SMALL (640px+)
   ========================================================== */
@media (min-width: 640px) {
  .hero-ctas {
    flex-direction: row;
    justify-content: center;
  }

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

  .stats-bar {
    grid-template-columns: repeat(4, 1fr);
  }

  .form-row {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
  }

  .btn-submit {
    width: auto;
  }
}

/* ==========================================================
   15. RESPONSIVE — MEDIUM (768px+)
   ========================================================== */
@media (min-width: 768px) {
  .about-grid {
    grid-template-columns: 280px 1fr;
    gap: var(--space-3xl);
    align-items: start;
  }

  .contact-grid {
    grid-template-columns: 1fr 300px;
    gap: var(--space-3xl);
  }

  .process-steps {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2xl);
  }
}

/* ==========================================================
   16. RESPONSIVE — LARGE (1024px+)
   ========================================================== */
@media (min-width: 1024px) {
  /* Desktop nav */
  .nav-toggle {
    display: none;
  }

  .main-nav {
    position: static;
    width: auto;
    max-width: none;
    height: auto;
    background: transparent;
    box-shadow: none;
    padding: 0;
    overflow: visible;
  }

  .nav-list {
    flex-direction: row;
    align-items: center;
    gap: var(--space-xs);
  }

  .nav-link {
    font-size: var(--text-sm);
    padding: var(--space-xs) var(--space-md);
  }

  .nav-cta {
    margin-top: 0;
    margin-left: var(--space-sm);
    padding: var(--space-xs) var(--space-lg);
  }

  /* Services grid */
  .services-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  /* Process horizontal */
  .process-steps {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-xl);
  }

  .process-step {
    padding-left: 0;
    padding-top: 4.5rem;
    text-align: center;
  }

  .step-number {
    left: 50%;
    transform: translateX(-50%);
  }
}

/* ==========================================================
   17. PRINT STYLES
   ========================================================== */
@media print {
  .site-header,
  .nav-toggle,
  .hero-ctas,
  .btn,
  .contact-form,
  .footer-social {
    display: none;
  }

  body {
    font-size: 12pt;
    color: #000;
    background: #fff;
  }

  .hero {
    background: #fff;
    color: #000;
    padding-top: 0;
  }

  .hero-heading {
    color: #000;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  section {
    page-break-inside: avoid;
  }
}