/* KoNote Website - CSS Stylesheet
   Accessible, responsive, no frameworks */

/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */
:root {
  /* Colours - accessible contrast ratios */
  --color-primary: #3176aa;        /* KoNote logo blue */
  --color-primary-dark: #296490;   /* Darker for hover states */
  --color-primary-light: #e8f0f8;  /* Light tint for backgrounds */

  --color-secondary: #2d6a4f;      /* Forest green - accent */
  --color-secondary-light: #e9f5f0;

  --color-text: #1f2937;           /* Near-black for body text */
  --color-text-muted: #4b5563;     /* Grey for secondary text */
  --color-text-light: #6b7280;     /* Lighter grey */

  --color-bg: #ffffff;             /* White background */
  --color-bg-alt: #f9fafb;         /* Light grey for alternating sections */
  --color-bg-code: #f3f4f6;        /* Code block background */

  --color-border: #e5e7eb;         /* Light border */
  --color-border-dark: #d1d5db;    /* Darker border for emphasis */

  --color-warning: #92400e;        /* Amber for warnings */
  --color-warning-bg: #fef3c7;     /* Warning background */
  --color-warning-border: #f59e0b;

  --color-info: #1e40af;           /* Blue for info boxes */
  --color-info-bg: #dbeafe;
  --color-info-border: #3b82f6;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, 'SF Mono', Consolas, 'Liberation Mono', Menlo, monospace;

  --font-size-sm: 0.875rem;        /* 14px */
  --font-size-base: 1rem;          /* 16px */
  --font-size-lg: 1.125rem;        /* 18px */
  --font-size-xl: 1.25rem;         /* 20px */
  --font-size-2xl: 1.5rem;         /* 24px */
  --font-size-3xl: 1.875rem;       /* 30px */
  --font-size-4xl: 2.25rem;        /* 36px */

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;

  /* Spacing */
  --space-1: 0.25rem;    /* 4px */
  --space-2: 0.5rem;     /* 8px */
  --space-3: 0.75rem;    /* 12px */
  --space-4: 1rem;       /* 16px */
  --space-5: 1.25rem;    /* 20px */
  --space-6: 1.5rem;     /* 24px */
  --space-8: 2rem;       /* 32px */
  --space-10: 2.5rem;    /* 40px */
  --space-12: 3rem;      /* 48px */
  --space-16: 4rem;      /* 64px */

  /* Layout */
  --max-width: 1200px;
  --max-width-content: 800px;

  /* Borders & Shadows */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);

  /* Focus ring for accessibility */
  --focus-ring: 0 0 0 3px rgba(26, 95, 122, 0.4);
}

/* ============================================
   Reset & Base Styles
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: 100%; /* Respect user font size preferences */
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
}

/* ============================================
   Skip Navigation (Accessibility)
   ============================================ */
.skip-nav {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary);
  color: white;
  text-decoration: none;
  font-weight: 600;
  border-radius: var(--radius-md);
  z-index: 1000;
}

.skip-nav:focus {
  top: var(--space-4);
  outline: none;
  box-shadow: var(--focus-ring);
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  margin-bottom: var(--space-4);
  font-weight: 600;
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

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

p {
  margin-top: 0;
  margin-bottom: var(--space-4);
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

a:focus {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-sm);
}

ul, ol {
  margin-top: 0;
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

li {
  margin-bottom: var(--space-2);
}

code {
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  background: var(--color-bg-code);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
}

pre {
  background: var(--color-bg-code);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: var(--space-4);
}

pre code {
  background: none;
  padding: 0;
}

/* ============================================
   Layout Components
   ============================================ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

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

/* ============================================
   Header & Navigation
   ============================================ */
.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-4) 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.site-logo {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.site-logo-mark {
  height: 24px;
  width: auto;
}

.site-logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #808285;
  line-height: 1;
}

.site-logo-ko {
  color: var(--color-primary);
}

.site-nav {
  display: flex;
  gap: var(--space-1);
  flex-wrap: wrap;
}

.site-nav a {
  padding: var(--space-2) var(--space-3);
  text-decoration: none;
  color: var(--color-text);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.site-nav a:hover {
  background: var(--color-bg-alt);
  color: var(--color-primary);
}

.site-nav a[aria-current="page"] {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

/* Mobile navigation toggle */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--font-size-sm);
}

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

  .site-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    padding-top: var(--space-4);
  }

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

  .site-nav a {
    padding: var(--space-3) var(--space-4);
  }
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  padding: var(--space-16) 0;
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-bg) 100%);
}

.hero h1 {
  font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-4xl));
  margin-bottom: var(--space-4);
}

.hero-tagline {
  font-size: var(--font-size-xl);
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
  max-width: 600px;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-block;
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-base);
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s, color 0.15s;
}

.btn:focus {
  outline: none;
  box-shadow: var(--focus-ring);
}

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

.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: white;
}

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

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

.btn-group {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* ============================================
   Cards & Boxes
   ============================================ */
.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-4);
}

.card h3 {
  margin-bottom: var(--space-3);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}

/* Alert/Notice boxes */
.notice {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-6);
  border-left: 4px solid;
}

.notice-warning {
  background: var(--color-warning-bg);
  border-color: var(--color-warning-border);
  color: var(--color-warning);
}

.notice-info {
  background: var(--color-info-bg);
  border-color: var(--color-info-border);
  color: var(--color-info);
}

.notice-title {
  font-weight: 600;
  margin-bottom: var(--space-2);
}

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

/* Disclaimer box (prominent warning) */
.disclaimer {
  background: var(--color-warning-bg);
  border: 2px solid var(--color-warning-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin: var(--space-8) 0;
}

.disclaimer-title {
  font-weight: 700;
  color: var(--color-warning);
  margin-bottom: var(--space-3);
  font-size: var(--font-size-lg);
}

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

/* ============================================
   Feature Lists
   ============================================ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-8);
  margin: var(--space-8) 0;
}

.feature-item h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-2);
}

.feature-item p {
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* Check/X lists for does/doesn't */
.check-list, .x-list {
  list-style: none;
  padding-left: 0;
}

.check-list li, .x-list li {
  position: relative;
  padding-left: var(--space-8);
  margin-bottom: var(--space-3);
}

.check-list li::before {
  content: "\2713"; /* Checkmark */
  position: absolute;
  left: 0;
  color: var(--color-secondary);
  font-weight: bold;
  font-size: var(--font-size-lg);
}

.x-list li::before {
  content: "\2717"; /* X mark */
  position: absolute;
  left: 0;
  color: var(--color-text-muted);
  font-weight: bold;
  font-size: var(--font-size-lg);
}

/* ============================================
   Sections
   ============================================ */
section {
  padding: var(--space-12) 0;
}

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

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-10);
}

.section-header p {
  color: var(--color-text-muted);
  font-size: var(--font-size-lg);
}

/* ============================================
   Two-Column Layout
   ============================================ */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-10);
  align-items: start;
}

@media (max-width: 768px) {
  .two-col {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   Screenshot Placeholders
   ============================================ */
.screenshot-placeholder {
  background: var(--color-bg-alt);
  border: 2px dashed var(--color-border-dark);
  border-radius: var(--radius-lg);
  padding: var(--space-10);
  text-align: center;
  color: var(--color-text-muted);
}

.screenshot-placeholder span {
  display: block;
  font-size: var(--font-size-sm);
  margin-top: var(--space-2);
}

/* ============================================
   Tables
   ============================================ */
.table-wrapper {
  overflow-x: auto;
  margin-bottom: var(--space-6);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}

th, td {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  background: var(--color-bg-alt);
  font-weight: 600;
}

tr:hover {
  background: var(--color-bg-alt);
}

/* ============================================
   FAQ Accordion
   ============================================ */
.faq-item {
  border-bottom: 1px solid var(--color-border);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: var(--space-5) 0;
  background: none;
  border: none;
  font-size: var(--font-size-lg);
  font-weight: 500;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--color-text);
}

.faq-question:hover {
  color: var(--color-primary);
}

.faq-question:focus {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-sm);
}

.faq-question::after {
  content: "+";
  font-size: var(--font-size-xl);
  color: var(--color-text-muted);
}

.faq-item.is-open .faq-question::after {
  content: "\2212"; /* Minus sign */
}

.faq-answer {
  display: none;
  padding-bottom: var(--space-5);
  color: var(--color-text-muted);
}

.faq-item.is-open .faq-answer {
  display: block;
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: var(--space-10) 0;
  margin-top: var(--space-12);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer-links {
  display: flex;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--font-size-sm);
}

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

.footer-copyright {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
}

/* ============================================
   Page-Specific Styles
   ============================================ */

/* Documentation page - doc cards */
.doc-card {
  border: 2px solid var(--color-border);
  transition: border-color 0.15s;
}

.doc-card:hover {
  border-color: var(--color-primary);
}

.doc-card h3 {
  color: var(--color-primary);
}

/* Services page - pricing-style card */
.service-card {
  border: 2px solid var(--color-primary);
  position: relative;
}

.service-card::before {
  content: "Professional Setup";
  position: absolute;
  top: -12px;
  left: var(--space-4);
  background: var(--color-primary);
  color: white;
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius-sm);
}

/* ============================================
   Utility Classes
   ============================================ */
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }
.mt-8 { margin-top: var(--space-8); }

/* Visually hidden (for screen readers) */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
  .site-header,
  .site-footer,
  .skip-nav,
  .nav-toggle {
    display: none;
  }

  body {
    font-size: 12pt;
    color: black;
    background: white;
  }

  a {
    color: black;
    text-decoration: underline;
  }

  .hero {
    background: none;
    padding: var(--space-4) 0;
  }
}