/* ==========================================================================
   Schwartzenburg Consulting - Styles
   A clean, professional design for a solo consulting business.
   Mobile-first, accessible, and fast.
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Colors - Sophisticated slate palette with warm accent */
  --color-ink: #1a2e44;          /* Deep navy - primary text */
  --color-ink-light: #4a5d6f;    /* Lighter slate - secondary text */
  --color-ink-muted: #6b7c8a;    /* Muted - tertiary text */
  --color-paper: #f4f1eb;        /* Warm off-white - background */
  --color-paper-alt: #eae5db;    /* Slightly darker - section bg */
  --color-accent: #c45a3b;       /* Terracotta - CTA accent */
  --color-accent-hover: #a84830; /* Darker accent for hover */
  --color-border: #d4cfc5;       /* Subtle border */
  
  /* Typography */
  --font-display: 'Instrument Serif', Georgia, 'Times New Roman', serif;
  --font-body: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  
  /* Font sizes - fluid scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
  --text-base: clamp(1rem, 0.925rem + 0.375vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.625vw, 1.375rem);
  --text-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.625rem);
  --text-2xl: clamp(1.5rem, 1.25rem + 1.25vw, 2.25rem);
  --text-3xl: clamp(1.875rem, 1.5rem + 1.875vw, 3rem);
  --text-4xl: clamp(2.25rem, 1.75rem + 2.5vw, 4rem);
  
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  
  /* Layout */
  --container-max: 68rem;
  --container-padding: clamp(1.25rem, 5vw, 2.5rem);
  --header-height: 4.5rem;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

/* --------------------------------------------------------------------------
   Reset & Base Styles
   -------------------------------------------------------------------------- */
*,
*::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-body);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: 1.65;
  color: var(--color-ink);
  background-color: var(--color-paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
  list-style: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

/* Focus styles for accessibility */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-ink);
  color: var(--color-paper);
  z-index: 1000;
}

.skip-link:focus {
  top: 0;
}

/* --------------------------------------------------------------------------
   Layout Utilities
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

/* --------------------------------------------------------------------------
   Header & Navigation
   -------------------------------------------------------------------------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--color-paper);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-ink);
  transition: opacity var(--transition-fast);
}

.logo:hover {
  opacity: 0.8;
}

.logo-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-paper);
  background: var(--color-ink);
  border-radius: 0.375rem;
}

.logo-text {
  display: none;
}

@media (min-width: 640px) {
  .logo-text {
    display: block;
  }
}

/* Navigation */
.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  color: var(--color-ink);
  border-radius: 0.375rem;
  transition: background var(--transition-fast);
}

.nav-toggle:hover {
  background: var(--color-paper-alt);
}

.nav-icon--close {
  display: none;
}

.nav-toggle[aria-expanded="true"] .nav-icon--open {
  display: none;
}

.nav-toggle[aria-expanded="true"] .nav-icon--close {
  display: block;
}

.nav-menu {
  position: absolute;
  top: var(--header-height);
  left: 0;
  right: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding: var(--space-md) var(--container-padding);
  background: var(--color-paper);
  border-bottom: 1px solid var(--color-border);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-0.5rem);
  transition: 
    opacity var(--transition-base),
    visibility var(--transition-base),
    transform var(--transition-base);
}

.nav-menu.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-link {
  display: block;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-ink-light);
  border-radius: 0.375rem;
  transition: 
    color var(--transition-fast),
    background var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-ink);
  background: var(--color-paper-alt);
}

.nav-link--cta {
  color: var(--color-paper);
  background: var(--color-ink);
}

.nav-link--cta:hover {
  color: var(--color-paper);
  background: var(--color-ink-light);
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }
  
  .nav-menu {
    position: static;
    flex-direction: row;
    align-items: center;
    gap: var(--space-xs);
    padding: 0;
    background: transparent;
    border: none;
    opacity: 1;
    visibility: visible;
    transform: none;
  }
  
  .nav-link {
    padding: var(--space-xs) var(--space-md);
  }
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-xl);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1.5;
  text-align: center;
  border-radius: 0.5rem;
  transition: 
    color var(--transition-fast),
    background var(--transition-fast),
    transform var(--transition-fast);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

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

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

.btn--secondary {
  color: var(--color-ink);
  background: transparent;
  border: 1.5px solid var(--color-border);
}

.btn--secondary:hover {
  border-color: var(--color-ink-muted);
  background: var(--color-paper-alt);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
  padding-top: calc(var(--header-height) + var(--space-4xl));
  padding-bottom: var(--space-4xl);
  text-align: center;
}

.hero-title {
  max-width: 16ch;
  margin-inline: auto;
  margin-bottom: var(--space-lg);
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 400;
  line-height: 1.15;
  color: var(--color-ink);
  letter-spacing: -0.02em;
}

.hero-subtitle {
  max-width: 55ch;
  margin-inline: auto;
  margin-bottom: var(--space-2xl);
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--color-ink-light);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
}

/* --------------------------------------------------------------------------
   Section Base Styles
   -------------------------------------------------------------------------- */
.section {
  padding-block: var(--space-4xl);
}

.section-title {
  margin-bottom: var(--space-md);
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 400;
  line-height: 1.2;
  color: var(--color-ink);
  letter-spacing: -0.01em;
}

.section-intro {
  max-width: 50ch;
  margin-bottom: var(--space-2xl);
  font-size: var(--text-lg);
  color: var(--color-ink-light);
}

/* --------------------------------------------------------------------------
   Services Section
   -------------------------------------------------------------------------- */
.section--services {
  background: var(--color-paper-alt);
}

.services-list {
  display: grid;
  gap: var(--space-xl);
}

.service-item {
  display: flex;
  gap: var(--space-lg);
  padding: var(--space-lg);
  background: var(--color-paper);
  border-radius: 0.75rem;
  border: 1px solid var(--color-border);
}

.service-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.5rem;
  height: 3.5rem;
  color: var(--color-accent);
  background: var(--color-paper-alt);
  border-radius: 0.5rem;
}

.service-content h3 {
  margin-bottom: var(--space-xs);
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-ink);
}

.service-content p {
  font-size: var(--text-sm);
  color: var(--color-ink-light);
  line-height: 1.6;
}

@media (min-width: 768px) {
  .services-list {
    grid-template-columns: repeat(2, 1fr);
  }
  
  /* Center the last item if odd number */
  .service-item:last-child:nth-child(odd) {
    grid-column: 1 / -1;
    max-width: calc(50% - var(--space-md));
    margin-inline: auto;
  }
}

/* --------------------------------------------------------------------------
   Process Section
   -------------------------------------------------------------------------- */
.process-steps {
  display: grid;
  gap: var(--space-xl);
  margin-bottom: var(--space-3xl);
  counter-reset: step;
}

.process-step {
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
}

.process-number {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-style: italic;
  color: var(--color-accent);
  background: var(--color-paper-alt);
  border-radius: 50%;
}

.process-content h3 {
  margin-bottom: var(--space-xs);
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-ink);
}

.process-content p {
  color: var(--color-ink-light);
}

@media (min-width: 768px) {
  .process-steps {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-2xl);
  }
  
  .process-step {
    flex-direction: column;
    text-align: center;
    align-items: center;
  }
  
  .process-number {
    width: 4rem;
    height: 4rem;
    font-size: var(--text-2xl);
  }
}

/* Callout Box */
.callout {
  padding: var(--space-xl);
  background: var(--color-ink);
  color: var(--color-paper);
  border-radius: 0.75rem;
}

.callout-title {
  margin-bottom: var(--space-sm);
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-paper);
}

.callout p {
  margin-bottom: var(--space-lg);
  color: rgba(244, 241, 235, 0.85);
}

.callout strong {
  color: var(--color-paper);
}

.callout .btn--primary {
  background: var(--color-paper);
  color: var(--color-ink);
}

.callout .btn--primary:hover {
  background: var(--color-paper-alt);
}

/* --------------------------------------------------------------------------
   About Section
   -------------------------------------------------------------------------- */
.section--about {
  background: var(--color-paper-alt);
}

.about-content {
  max-width: 65ch;
}

.about-lead {
  margin-bottom: var(--space-lg);
  font-size: var(--text-xl);
  line-height: 1.6;
  color: var(--color-ink);
}

.about-content p {
  color: var(--color-ink-light);
}

.about-content p + p {
  margin-top: var(--space-md);
}

/* --------------------------------------------------------------------------
   Contact Section
   -------------------------------------------------------------------------- */
.section--contact {
  text-align: center;
}

.section--contact .section-intro {
  margin-inline: auto;
}

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

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-ink);
  background: var(--color-paper-alt);
  border-radius: 0.5rem;
  border: 1px solid var(--color-border);
  transition: 
    background var(--transition-fast),
    border-color var(--transition-fast);
}

.contact-link:hover {
  background: var(--color-border);
  border-color: var(--color-ink-muted);
}

.contact-link svg {
  color: var(--color-accent);
  flex-shrink: 0;
}


@media (min-width: 640px) {
  .contact-methods {
    flex-direction: row;
    justify-content: center;
    flex-wrap: wrap;
  }
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  padding-block: var(--space-xl);
  background: var(--color-ink);
  color: var(--color-paper);
}

.footer-inner {
  text-align: center;
}

.footer-copy {
  font-size: var(--text-sm);
  color: rgba(244, 241, 235, 0.6);
}

/* --------------------------------------------------------------------------
   Print Styles
   -------------------------------------------------------------------------- */
@media print {
  .header,
  .nav-toggle {
    display: none;
  }
  
  .hero {
    padding-top: var(--space-2xl);
  }
  
  .section {
    padding-block: var(--space-xl);
  }
}