/* =============================================
   OpenCALL Brochure Site — style.css
   Teal / blue-grey color scheme, no purple.
   ============================================= */

/* ------ Custom Properties (Light) ------ */
:root {
  --color-bg: #f8f9fa;
  --color-surface: #ffffff;
  --color-text: #1a1a2e;
  --color-text-muted: #5a5f72;
  --color-border: #dde1e6;
  --color-code-bg: #1e1e2e;
  --color-code-text: #cdd6f4;
  --color-code-label: #a6adc8;
  --color-teal: #0d9488;
  --color-teal-hover: #0a7a70;
  --color-teal-light: #ccfbf1;
  --color-link: #0d7377;
  --color-table-alt: #f1f3f5;
  --color-table-header: #e8ebed;
  --color-card-bg: #ffffff;
  --color-card-border: #dde1e6;
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-card-hover: 0 4px 12px rgba(0, 0, 0, 0.08);
}

/* ------ Custom Properties (Dark) ------ */
[data-theme="dark"] {
  --color-bg: #0f1219;
  --color-surface: #181c25;
  --color-text: #e2e4e9;
  --color-text-muted: #8b90a0;
  --color-border: #2a2f3d;
  --color-code-bg: #12141c;
  --color-code-text: #cdd6f4;
  --color-code-label: #6c7086;
  --color-teal: #2dd4bf;
  --color-teal-hover: #14b8a6;
  --color-teal-light: rgba(45, 212, 191, 0.1);
  --color-link: #5eead4;
  --color-table-alt: #1c2029;
  --color-table-header: #222738;
  --color-card-bg: #181c25;
  --color-card-border: #2a2f3d;
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-card-hover: 0 4px 12px rgba(0, 0, 0, 0.3);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color 0.3s ease, color 0.3s ease;
}

a {
  color: var(--color-link);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

code {
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', 'JetBrains Mono', Menlo, Consolas, monospace;
  font-size: 0.88em;
  padding: 0.15em 0.4em;
  border-radius: 4px;
  background: var(--color-code-bg);
  color: var(--color-code-text);
}

pre code {
  padding: 0;
  background: none;
  font-size: 0.85rem;
}

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

/* ------ Layout ------ */
header,
main,
footer {
  max-width: 1100px;
  margin: 0 auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* ------ Navigation ------ */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  padding-top: 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--color-border);
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.3rem;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.logo strong {
  font-weight: 700;
}

.logo:hover {
  text-decoration: none;
  color: var(--color-teal);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-links a {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.nav-links a:hover {
  color: var(--color-teal);
  text-decoration: none;
}

/* ------ Dark Mode Toggle ------ */
#theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  cursor: pointer;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--color-text-muted);
  transition: border-color 0.2s, color 0.2s, background-color 0.2s;
}

#theme-toggle:hover {
  border-color: var(--color-teal);
  color: var(--color-teal);
  background-color: var(--color-teal-light);
}

/* Show/hide sun & moon icons */
[data-theme="light"] .icon-dark,
[data-theme="dark"] .icon-light {
  display: none;
}

/* ------ Sections ------ */
section {
  padding: 3.5rem 0 2rem;
}

section + section {
  border-top: 1px solid var(--color-border);
}

section h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

section p {
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
}

/* ------ Hero ------ */
.hero {
  text-align: center;
  padding: 4rem 0 3rem;
  border-top: none;
}

.hero h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.hero .hero-description {
  margin-left: auto;
  margin-right: auto;
  font-size: 1.05rem;
  color: var(--color-text-muted);
  margin-bottom: 2rem;
}

/* ------ XKCD Figure ------ */
.xkcd-figure {
  text-align: center;
  margin-bottom: 1.5rem;
}

.xkcd-figure img {
  width: 500px;
  max-width: 100%;
  height: auto;
  padding: 1rem;
  background: #fff;
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.xkcd-figure figcaption {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  margin-top: 0.5rem;
}

/* ------ Buttons ------ */
.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: background-color 0.2s ease, transform 0.1s ease;
  cursor: pointer;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-primary {
  background-color: var(--color-teal);
  color: #fff;
}

.btn-primary:hover {
  background-color: var(--color-teal-hover);
  color: #fff;
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-teal);
  border: 2px solid var(--color-teal);
}

.btn-secondary:hover {
  background-color: var(--color-teal);
  color: #fff;
}

/* ------ Cards ------ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: 10px;
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.2s ease, transform 0.15s ease;
}

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

.card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
  color: var(--color-text);
}

.card p {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* ------ Code Blocks ------ */
.code-block-wrapper {
  margin: 1.5rem 0;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.code-label {
  background: var(--color-code-bg);
  color: var(--color-code-label);
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.5rem 1.25rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

pre {
  background: var(--color-code-bg);
  color: var(--color-code-text);
  padding: 1.25rem;
  overflow-x: auto;
  line-height: 1.6;
  margin: 0;
}

/* ------ Comparison Table ------ */
.table-wrapper {
  overflow-x: auto;
  margin-top: 1.5rem;
  border-radius: 10px;
  border: 1px solid var(--color-border);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  min-width: 640px;
}

thead th {
  background: var(--color-table-header);
  text-align: left;
  padding: 0.85rem 1rem;
  font-weight: 600;
  border-bottom: 2px solid var(--color-border);
}

thead th:first-child {
  width: 160px;
}

tbody td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

tbody tr:nth-child(even) {
  background: var(--color-table-alt);
}

tbody tr:last-child td {
  border-bottom: none;
}

/* Highlight OpenCALL column */
thead th:nth-child(2) {
  color: var(--color-teal);
}

tbody td:nth-child(2) {
  font-weight: 500;
}

/* ------ Footer ------ */
footer {
  padding: 2.5rem 1.5rem 3rem;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

footer p {
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

footer a {
  color: var(--color-text-muted);
  font-weight: 500;
}

footer a:hover {
  color: var(--color-teal);
}

/* ------ Responsive ------ */
@media (max-width: 640px) {
  .nav-links a:not(:last-child) {
    display: none;
  }

  .hero h1 {
    font-size: 1.5rem;
  }

  .hero .hero-description {
    font-size: 0.95rem;
  }

  section h2 {
    font-size: 1.4rem;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  table {
    font-size: 0.82rem;
  }

  thead th,
  tbody td {
    padding: 0.6rem 0.75rem;
  }

  .btn {
    width: 100%;
    text-align: center;
  }
}

@media (max-width: 480px) {
  header,
  main,
  footer {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  section {
    padding: 2.5rem 0 1.5rem;
  }

  .hero {
    padding: 2.5rem 0 2rem;
  }

  pre {
    padding: 1rem;
    font-size: 0.8rem;
  }
}