/* ==========================================================================
   CCO User Guide - Main Styles
   Design inspired by observatory dashboard
   ========================================================================== */

/* ==========================================================================
   CSS Variables - Design Tokens
   ========================================================================== */
:root {
  /* Colors - Paper theme */
  --color-paper: #f3eee4;
  --color-paper-strong: #fffaf2;
  --color-paper-light: #faf7f1;
  --color-paper-dark: #efe8dd;

  /* Colors - Ink */
  --color-ink: #141311;
  --color-ink-muted: #6c645a;
  --color-ink-faint: #9a918a;

  /* Colors - Accent */
  --color-accent: #a65c22;
  --color-accent-soft: rgba(166, 92, 34, 0.12);
  --color-accent-hover: #8a4a1a;

  /* Colors - Teal */
  --color-teal: #1f5a5d;
  --color-teal-soft: rgba(31, 90, 93, 0.11);

  /* Colors - Warning/Error */
  --color-warning: #934838;
  --color-warning-soft: rgba(147, 72, 56, 0.1);
  --color-success: #2d6a4f;
  --color-success-soft: rgba(45, 106, 79, 0.1);

  /* Colors - Panel */
  --color-panel: rgba(255, 250, 242, 0.78);
  --color-panel-strong: rgba(255, 252, 246, 0.92);
  --color-panel-border: rgba(20, 19, 17, 0.1);
  --color-panel-shadow: rgba(28, 23, 18, 0.1);

  /* Typography */
  --font-sans: "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --font-serif: "Iowan Old Style", "Palatino Linotype", serif;

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

  /* Border radius */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --radius-xl: 22px;
  --radius-2xl: 28px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;

  /* Layout */
  --sidebar-width: 280px;
  --header-height: 64px;
  --content-max-width: 900px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-ink);
  background: var(--color-paper);
  min-height: 100vh;
}

/* ==========================================================================
   Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.04em;
  color: var(--color-ink);
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  letter-spacing: -0.05em;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-lg);
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}

h4 {
  font-size: 1.125rem;
  font-family: var(--font-sans);
  font-weight: 600;
  letter-spacing: 0;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

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

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

a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

strong {
  font-weight: 600;
}

/* ==========================================================================
   Layout - App Shell
   ========================================================================== */
.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--color-panel-strong);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-panel-border);
  z-index: 1000;
  display: flex;
  align-items: center;
  padding: 0 var(--space-xl);
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-ink);
  text-decoration: none;
}

.header__logo:hover {
  text-decoration: none;
  color: var(--color-ink);
}

.header__logo-icon {
  width: 32px;
  height: 32px;
  background: var(--color-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 0.875rem;
}

.header__nav {
  display: flex;
  gap: var(--space-xs);
  margin-left: var(--space-2xl);
}

.header__nav-link {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-ink-muted);
  transition: all var(--transition-fast);
}

.header__nav-link:hover {
  background: var(--color-accent-soft);
  color: var(--color-accent);
  text-decoration: none;
}

.header__nav-link.active {
  background: var(--color-accent);
  color: white;
}

.header__search {
  margin-left: auto;
  position: relative;
}

.header__search-btn {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-paper-dark);
  border: 1px solid var(--color-panel-border);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: var(--color-ink-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-width: 200px;
}

.header__search-btn:hover {
  background: var(--color-paper);
  border-color: var(--color-accent);
}

.header__search-kbd {
  margin-left: auto;
  padding: 2px 6px;
  background: white;
  border: 1px solid var(--color-panel-border);
  border-radius: 4px;
  font-size: 0.75rem;
  font-family: monospace;
}

/* Main content area */
.main {
  display: flex;
  flex: 1;
  margin-top: var(--header-height);
}

/* Sidebar */
.sidebar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: var(--sidebar-width);
  height: calc(100vh - var(--header-height));
  background: var(--color-panel);
  backdrop-filter: blur(14px);
  border-right: 1px solid var(--color-panel-border);
  overflow-y: auto;
  padding: var(--space-lg);
  z-index: 900;
}

.sidebar__section {
  margin-bottom: var(--space-xl);
}

.sidebar__title {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-ink-faint);
  margin-bottom: var(--space-sm);
}

.sidebar__list {
  list-style: none;
}

.sidebar__item {
  margin-bottom: var(--space-xs);
}

.sidebar__link {
  display: flex;
  align-items: center;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: var(--color-ink-muted);
  transition: all var(--transition-fast);
}

.sidebar__link:hover {
  background: var(--color-accent-soft);
  color: var(--color-accent);
  text-decoration: none;
}

.sidebar__link.active {
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-weight: 500;
}

.sidebar__link-indicator {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-ink-faint);
  margin-right: var(--space-sm);
}

.sidebar__link.active .sidebar__link-indicator {
  background: var(--color-accent);
}

/* Content */
.content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: var(--space-2xl) var(--space-2xl);
  max-width: calc(var(--content-max-width) + var(--space-2xl) * 2);
}

.content__header {
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-panel-border);
}

.content__title {
  margin-bottom: var(--space-sm);
}

.content__description {
  font-size: 1.125rem;
  color: var(--color-ink-muted);
  max-width: 600px;
}

/* ==========================================================================
   Components - Cards
   ========================================================================== */
.card {
  background: var(--color-panel-strong);
  border: 1px solid var(--color-panel-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: 0 8px 32px var(--color-panel-shadow);
  margin-bottom: var(--space-lg);
}

.card--accent {
  border-left: 4px solid var(--color-accent);
}

.card--teal {
  border-left: 4px solid var(--color-teal);
}

.card--warning {
  border-left: 4px solid var(--color-warning);
}

.card__title {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.card__subtitle {
  font-size: 0.875rem;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-md);
}

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

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

thead {
  background: var(--color-paper-dark);
}

th {
  text-align: left;
  padding: var(--space-md);
  font-weight: 600;
  color: var(--color-ink);
  border-bottom: 2px solid var(--color-panel-border);
}

td {
  padding: var(--space-md);
  border-bottom: 1px solid var(--color-panel-border);
  vertical-align: top;
}

tr:hover td {
  background: var(--color-paper-light);
}

td code {
  background: var(--color-paper-dark);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.8125rem;
}

/* ==========================================================================
   Components - Code Blocks
   ========================================================================== */
pre {
  background: var(--color-ink);
  color: var(--color-paper);
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.5;
  margin-bottom: var(--space-lg);
}

code {
  font-family: "Fira Code", "SF Mono", Consolas, monospace;
}

:not(pre) > code {
  background: var(--color-paper-dark);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.875rem;
}

.code-block {
  position: relative;
  margin-bottom: var(--space-lg);
}

.code-block__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-ink-muted);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  font-size: 0.75rem;
}

.code-block__lang {
  color: var(--color-paper);
  font-weight: 500;
}

.code-block__copy {
  background: none;
  border: none;
  color: var(--color-paper);
  cursor: pointer;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  transition: background var(--transition-fast);
}

.code-block__copy:hover {
  background: rgba(255,255,255,0.1);
}

.code-block pre {
  margin: 0;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

/* ==========================================================================
   Components - Badges
   ========================================================================== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 500;
}

.badge--required {
  background: var(--color-warning-soft);
  color: var(--color-warning);
}

.badge--optional {
  background: var(--color-teal-soft);
  color: var(--color-teal);
}

.badge--default {
  background: var(--color-paper-dark);
  color: var(--color-ink-muted);
}

.badge--new {
  background: var(--color-accent-soft);
  color: var(--color-accent);
}

/* ==========================================================================
   Components - Callouts
   ========================================================================== */
.callout {
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-lg);
  display: flex;
  gap: var(--space-md);
}

.callout--info {
  background: var(--color-teal-soft);
  border-left: 4px solid var(--color-teal);
}

.callout--warning {
  background: var(--color-warning-soft);
  border-left: 4px solid var(--color-warning);
}

.callout--success {
  background: var(--color-success-soft);
  border-left: 4px solid var(--color-success);
}

.callout__icon {
  font-size: 1.25rem;
  flex-shrink: 0;
}

.callout__content {
  flex: 1;
}

.callout__title {
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

/* ==========================================================================
   Components - Navigation
   ========================================================================== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.875rem;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-md);
}

.breadcrumb__separator {
  color: var(--color-ink-faint);
}

.breadcrumb__link {
  color: var(--color-ink-muted);
}

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

.page-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-panel-border);
}

.page-nav__item {
  display: flex;
  flex-direction: column;
  padding: var(--space-lg);
  background: var(--color-panel-strong);
  border: 1px solid var(--color-panel-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

.page-nav__item:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px var(--color-panel-shadow);
}

.page-nav__label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-ink-faint);
  margin-bottom: var(--space-xs);
}

.page-nav__title {
  font-weight: 600;
  color: var(--color-ink);
}

.page-nav__title:hover {
  color: var(--color-accent);
}

/* ==========================================================================
   Components - Search Modal
   ========================================================================== */
.search-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(20, 19, 17, 0.5);
  z-index: 2000;
  align-items: flex-start;
  justify-content: center;
  padding-top: 15vh;
}

.search-modal.active {
  display: flex;
}

.search-modal__box {
  width: 100%;
  max-width: 600px;
  background: var(--color-paper);
  border-radius: var(--radius-xl);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.3);
  overflow: hidden;
}

.search-modal__input-wrapper {
  display: flex;
  align-items: center;
  padding: var(--space-lg);
  border-bottom: 1px solid var(--color-panel-border);
}

.search-modal__input {
  flex: 1;
  border: none;
  background: none;
  font-size: 1.125rem;
  font-family: var(--font-sans);
  outline: none;
}

.search-modal__results {
  max-height: 400px;
  overflow-y: auto;
}

.search-modal__result {
  display: block;
  padding: var(--space-md) var(--space-lg);
  transition: background var(--transition-fast);
}

.search-modal__result:hover {
  background: var(--color-accent-soft);
}

.search-modal__result-title {
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.search-modal__result-path {
  font-size: 0.75rem;
  color: var(--color-ink-muted);
  font-family: monospace;
}

.search-modal__footer {
  padding: var(--space-sm) var(--space-lg);
  background: var(--color-paper-dark);
  font-size: 0.75rem;
  color: var(--color-ink-muted);
  display: flex;
  gap: var(--space-lg);
}

.search-modal__shortcut {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.search-modal__key {
  padding: 2px 6px;
  background: white;
  border: 1px solid var(--color-panel-border);
  border-radius: 4px;
  font-family: monospace;
}

/* ==========================================================================
   Utilities
   ========================================================================== */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.text-muted {
  color: var(--color-ink-muted);
}

.text-small {
  font-size: 0.875rem;
}

.text-mono {
  font-family: monospace;
}

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .content {
    margin-left: 0;
    padding: var(--space-lg);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  .header__nav {
    display: none;
  }

  .page-nav {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.375rem;
  }
}