/* Synergentic Design System — CSS Custom Properties
   All colors, fonts, and spacing must use these variables.
   Never hardcode hex values in templates or component styles. */

/* Google Fonts — loaded in base.html */

:root {
  /* Primary — Deep Navy: trust, technology, professionalism */
  --color-primary:        #0D1B2A;

  /* Secondary — Electric Teal: modern, forward-thinking, SaaS energy */
  --color-secondary:      #00B4D8;

  /* Accent — Warm Amber: calls to action, highlights, energy */
  --color-accent:         #F4A261;

  /* Surface colors */
  --color-background:     #F8FAFC;
  --color-surface:        #FFFFFF;
  --color-surface-dark:   #1A2B3C;

  /* Text */
  --color-text-primary:   #0D1B2A;
  --color-text-secondary: #4A5568;
  --color-text-inverse:   #F8FAFC;

  /* Semantic */
  --color-success:        #38A169;
  --color-error:          #E53E3E;
  --color-warning:        #D69E2E;
  --color-border:         #E2E8F0;

  /* Typography */
  --font-heading: 'DM Serif Display', Georgia, serif;
  --font-body:    'DM Sans', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', 'Courier New', monospace;

  /* Type Scale */
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --text-5xl:  3rem;

  /* Border Radius */
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  16px;
  --radius-xl:  24px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.08);
  --shadow-md:  0 4px 12px rgba(0,0,0,0.10);
  --shadow-lg:  0 8px 30px rgba(0,0,0,0.12);

  /* Layout */
  --max-width:  1200px;
  --section-padding: 5rem 1.5rem;
}

/* ========================================
   Base Styles
   ======================================== */

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

html {
  font-size: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   Typography
   ======================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.2;
  margin-top: 0;
  color: var(--color-text-primary);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

p {
  margin-top: 0;
  margin-bottom: 1rem;
}

a {
  color: var(--color-secondary);
  text-decoration: underline;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-primary);
}

/* ========================================
   Skip Link (Accessibility)
   ======================================== */

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 9999;
  padding: 0.75rem 1.5rem;
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  font-weight: 700;
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 1rem;
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* ========================================
   Focus Styles (WCAG 2.1 AA)
   ======================================== */

:focus-visible {
  outline: 3px solid var(--color-secondary);
  outline-offset: 2px;
}

/* ========================================
   Screen Reader Only
   ======================================== */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ========================================
   Layout Utilities
   ======================================== */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section {
  padding: var(--section-padding);
}

/* ========================================
   Buttons
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn:focus-visible {
  outline: 3px solid var(--color-secondary);
  outline-offset: 2px;
}

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

.btn-primary:hover {
  background-color: #0096b7;
  color: var(--color-text-inverse);
}

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

.btn-accent:hover {
  background-color: #e6923e;
}

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

.btn-outline:hover {
  background-color: var(--color-secondary);
  color: var(--color-text-inverse);
}

/* ========================================
   Cards
   ======================================== */

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 1.5rem;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* ========================================
   Forms
   ======================================== */

.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-primary);
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color 0.2s ease;
}

.form-input:focus {
  border-color: var(--color-secondary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(0, 180, 216, 0.2);
}

.form-input[aria-invalid="true"] {
  border-color: var(--color-error);
}

.form-error {
  display: block;
  margin-top: 0.25rem;
  font-size: var(--text-sm);
  color: var(--color-error);
}

/* ========================================
   Alerts
   ======================================== */

.alert {
  padding: 1rem 1.5rem;
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  font-weight: 500;
}

.alert-success {
  background-color: #f0fff4;
  color: var(--color-success);
  border: 1px solid var(--color-success);
}

.alert-error {
  background-color: #fff5f5;
  color: var(--color-error);
  border: 1px solid var(--color-error);
}

.alert-warning {
  background-color: #fffff0;
  color: var(--color-warning);
  border: 1px solid var(--color-warning);
}

/* ========================================
   Navigation
   ======================================== */

.navbar {
  background-color: var(--color-primary);
  padding: 1rem 0;
}

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

.navbar-brand {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  color: var(--color-text-inverse);
  text-decoration: none;
}

.navbar-brand:hover {
  color: var(--color-secondary);
}

.navbar-nav {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 1.5rem;
}

.navbar-nav a {
  color: var(--color-text-inverse);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

.navbar-nav a:hover,
.navbar-nav a[aria-current="page"] {
  color: var(--color-secondary);
}

/* Mobile nav toggle */
.navbar-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-inverse);
  cursor: pointer;
  padding: 0.5rem;
}

@media (max-width: 768px) {
  .navbar-toggle {
    display: block;
  }

  .navbar-nav {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-primary);
    padding: 1rem 1.5rem;
    gap: 1rem;
  }

  .navbar-nav.is-open {
    display: flex;
  }
}

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

.footer {
  background-color: var(--color-surface-dark);
  color: var(--color-text-inverse);
  padding: 3rem 0 1.5rem;
}

.footer a {
  color: var(--color-text-inverse);
  opacity: 0.8;
  transition: opacity 0.2s ease;
}

.footer a:hover {
  opacity: 1;
  color: var(--color-secondary);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1.5rem;
  text-align: center;
  font-size: var(--text-sm);
  opacity: 0.7;
}

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

.hero {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  padding: 6rem 1.5rem;
  text-align: center;
}

/* ========== Markdown Content ========== */

.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

.markdown-body p {
  margin-bottom: 1em;
}

.markdown-body ul,
.markdown-body ol {
  padding-left: 1.5rem;
  margin-bottom: 1em;
}

.markdown-body li {
  margin-bottom: 0.25em;
}

.markdown-body blockquote {
  border-left: 4px solid var(--color-secondary);
  padding: 0.5rem 1rem;
  margin: 1em 0;
  color: var(--color-text-secondary);
  background-color: var(--color-background);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.markdown-body pre {
  background-color: #1e293b;
  color: #e2e8f0;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: 1em;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.6;
}

.markdown-body code {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.markdown-body p code,
.markdown-body li code {
  background-color: var(--color-background);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  font-size: 0.85em;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1em;
}

.markdown-body th,
.markdown-body td {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  text-align: left;
}

.markdown-body th {
  background-color: var(--color-background);
  font-weight: 600;
}

.markdown-body img {
  max-width: 100%;
  border-radius: var(--radius-md);
}

.markdown-body hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2em 0;
}

.markdown-body a {
  color: var(--color-secondary);
}

/* Pygments syntax highlighting overrides */
.markdown-body .highlight pre {
  background-color: #1e293b;
}

.hero h1 {
  color: var(--color-text-inverse);
  margin-bottom: 1.5rem;
}

.hero p {
  font-size: var(--text-xl);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 2rem;
  opacity: 0.9;
}