/* === Fonts (add real files to /assets/fonts/ and update paths) === */
@font-face {
  font-family: 'Poppins';
  src: url('/assets/fonts/Poppins-700.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Roboto';
  src: url('/assets/fonts/Roboto-400.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Roboto';
  src: url('/assets/fonts/Roboto-500.woff2') format('woff2');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

/* Responsive images helper */
.responsive-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* Accessible tables */
.table-responsive { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; margin-bottom: 1rem; }
table th, table td { padding: 10px 12px; border: 1px solid rgba(15,23,42,0.06); text-align: left; }
table th { background: rgba(13,59,102,0.04); font-weight: 600; }

/* Improve partner block contrast */
.partner .partner-desc p { color: #0b1820; }

/* Ensure SVG thumbnails get proper alt rendering and background */
.card svg, .article-featured img { background: linear-gradient(180deg,#fff,#f7fafc); }

/* Micro adjustments for readability */
.container { padding-left: 20px; padding-right: 20px; }
.article-content p, .article-content li { font-size: 1rem; color: var(--color-text); }

/* End font & utility additions */
:root {
  --color-primary: #0B6E6A;
  --color-secondary: #0D3B66;
  --color-accent: #FF9F1C;
  --color-neutral-light: #F6F7F9;
  --color-text: #1F2933;
  --color-bg: #ffffff;
  --font-primary: "Poppins", sans-serif;
  --font-secondary: "Roboto", sans-serif;
  --spacing-1: 8px;
  --spacing-2: 16px;
  --radius: 12px;
  --shadow: 0 6px 18px rgba(15,23,42,0.08);
  --transition: 0.22s ease;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font-secondary);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.5;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-2);
}

/* Header */
header.site-header {
  background: linear-gradient(90deg, rgba(11,110,106,0.06), transparent);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(6px);
  border-bottom: 1px solid rgba(15,23,42,0.04);
  transition: background 200ms ease, border-color 200ms ease;
}

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  height: 64px;
  padding: 0 var(--spacing-2);
}

.logo img { display: block; }

.main-nav { margin-left: auto; display: flex; align-items: center; }
.nav-list { list-style: none; display: flex; gap: 12px; margin: 0; padding: 0; }
.nav-list a { text-decoration: none; color: var(--color-text); font-weight: 500; }
.burger { display: none; background: none; border: 0; font-size: 18px; cursor: pointer; }

.header-actions { display: flex; align-items: center; gap: 12px; margin-left: 16px; }
.search input[type="search"] { padding: 8px 12px; border-radius: 8px; border: 1px solid #e6e9ee; background: var(--color-neutral-light); }

.partner-btn { background: var(--color-primary); color: #fff; padding: 8px 12px; border-radius: 8px; text-decoration: none; box-shadow: 0 6px 16px rgba(11,110,106,0.12); transition: transform var(--transition), box-shadow var(--transition); }
.partner-btn:hover { transform: translateY(-3px); box-shadow: 0 12px 28px rgba(11,110,106,0.14); }
.partner-btn:focus { outline: 3px solid rgba(11,110,106,0.18); outline-offset: 2px; }

#dark-toggle { background: none; border: 0; font-size: 18px; cursor: pointer; }

/* Hero */
.hero { padding: 48px 0; display: flex; align-items: center; }
.hero-inner { display: flex; gap: 24px; align-items: center; justify-content: space-between; }
.hero-text h1 { font-family: var(--font-primary); font-size: 28px; margin: 0 0 12px; color: var(--color-secondary); line-height: 1.08; }
.hero-text p { margin: 0 0 12px; color: var(--color-text); max-width: 680px; }
.hero-visual { width: 360px; height: 240px; border-radius: 12px; overflow: hidden; background: linear-gradient(180deg, rgba(13,59,102,0.06), rgba(11,110,106,0.04)); }

/* Buttons */
.btn { display: inline-block; padding: 10px 16px; border-radius: 10px; text-decoration: none; transition: var(--transition); }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-secondary { background: transparent; color: var(--color-primary); border: 1px solid var(--color-primary); }
.btn-outline { background: transparent; color: var(--color-text); border: 1px solid #d1d5db; }

/* Sections */
.about, .popular, .interactive, .why-read, .partner, .newsletter { padding: 32px 0; }

/* Cards grid */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; }
.card { background: var(--color-neutral-light); border-radius: 12px; padding: 12px; box-shadow: var(--shadow); overflow: hidden; transition: transform var(--transition), box-shadow var(--transition); }
.card:hover { transform: translateY(-6px); box-shadow: 0 18px 36px rgba(15,23,42,0.12); }
.card img { width: 100%; height: 200px; object-fit: cover; display: block; border-radius: 8px; }
.card .meta { color: #6b7280; font-size: 13px; margin-top: 8px; }

/* Article */
.article { padding: 24px 0; }
.article-featured { margin: 0 0 18px; border-radius: 12px; overflow: hidden; box-shadow: var(--shadow); }
.article-featured img { width: 100%; height: auto; display: block; }
.article-hero h1 { font-family: var(--font-primary); font-size: 26px; margin: 12px 0 6px; }
.article-meta { display: flex; gap: 12px; color: #6b7280; font-size: 14px; align-items: center; margin-bottom: 18px; }
.article-layout { display: grid; grid-template-columns: 1fr; gap: 24px; }
.toc { display: none; }
.article-sidebar { max-width: 320px; }

.article-content h2 { font-family: var(--font-primary); color: var(--color-secondary); }
blockquote { padding: 12px 16px; background: #fff9f2; border-left: 4px solid var(--color-accent); border-radius: 8px; margin: 12px 0; }

.article-sidebar .sticky { position: sticky; top: 88px; }
.partner-card { display: block; text-decoration: none; color: inherit; padding: 12px; background: #fff; border-radius: 8px; box-shadow: var(--shadow); }

/* Calculator */
.calculator { margin: 16px 0; padding: 12px; background: #fff; border-radius: 8px; }
.calculator label { display: block; margin-bottom: 8px; font-size: 14px; }
.calculator input[type="number"] { width: 100%; padding: 8px; border: 1px solid #e6e9ee; border-radius: 6px; }

/* Footer and misc */
.article-footer { margin-top: 24px; display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; align-items: center; }
.tags a { display: inline-block; background: #eef6f5; padding: 6px 8px; border-radius: 6px; margin-right: 6px; text-decoration: none; color: var(--color-primary); font-size: 13px; }
.site-footer { background: var(--color-secondary); color: #fff; padding: 32px 0; margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 18px; align-items: start; }
.footer-grid a { color: rgba(255,255,255,0.92); text-decoration: none; }

.site-footer { background: var(--color-secondary); color: #fff; padding: 24px 0; margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; align-items: start; }

/* Responsive */
@media (min-width: 768px) {
  .hero-text h1 { font-size: 36px; }
  .article-layout { grid-template-columns: 240px 1fr; }
  .toc { display: block; }
}

@media (max-width: 767px) {
  .burger { display: inline-block; }
  .nav-list { display: none; position: absolute; top: 64px; right: 16px; background: #fff; padding: 12px; border-radius: 8px; box-shadow: var(--shadow); }
  .header-inner { height: 56px; }
  .hero-inner { flex-direction: column; text-align: left; }
}

/* Dark mode */
body.dark-mode {
  --color-bg: #0f1720;
  --color-neutral-light: #0f1726;
  --color-text: #E6EEF2;
}
body.dark-mode .site-footer { background: #071428; }

/* Accessibility */
.visually-hidden { position: absolute !important; height: 1px; width: 1px; overflow: hidden; clip: rect(1px,1px,1px,1px); white-space: nowrap; }

/* Focus styles (prefer focus-visible for keyboards) */
:focus { outline: none; }
:focus-visible, .skip-link:focus, a:focus, button:focus, input:focus, select:focus, textarea:focus {
  box-shadow: var(--focus-ring);
  outline: none;
  border-radius: 8px;
}

/* Increased contrast focus for keyboard users */
:root { --focus-ring-high-contrast: 0 0 0 4px rgba(11,110,106,0.32); }
@media (prefers-contrast: more) {
  :focus-visible, .skip-link:focus, a:focus, button:focus, input:focus, select:focus, textarea:focus {
    box-shadow: var(--focus-ring-high-contrast);
  }
}

/* Utility */
.grid { display: grid; gap: var(--spacing-2); }
.flex { display: flex; gap: var(--spacing-2); align-items: center; }

/* Animations */
/* Respect prefers-reduced-motion: remove non-essential motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* Default subtle entrance animation */
.fade-in-up { animation: fadeInUp 0.6s ease-out forwards; opacity: 0; transform: translateY(8px); will-change: transform, opacity; }
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

/* Small tweaks */
input, button, select, textarea { font-family: inherit; font-size: 15px; }
/* === Accessibility & Typography polish (overrides) === */
/* Base typography scale and improved contrast */
:root {
  --font-size-base: 16px;
  --line-height-base: 1.55;
  --color-text: #0f1720; /* stronger text color for contrast */
  --color-muted: #6b7280;
  --focus-ring: 0 0 0 4px rgba(11,110,106,0.18);
}

/* Apply base scale */
html { font-size: var(--font-size-base); }
body { line-height: var(--line-height-base); }

/* Headings scale (mobile-first) */
h1 { font-family: var(--font-primary); font-size: 28px; line-height: 1.08; color: var(--color-secondary); margin: 0 0 0.6rem; }
h2 { font-family: var(--font-primary); font-size: 20px; margin: 0 0 0.5rem; color: var(--color-secondary); }
h3 { font-size: 16px; margin: 0 0 0.4rem; color: var(--color-text); }

/* Paragraphs and lists */
p, li { color: var(--color-text); font-size: 1rem; margin-bottom: 0.9rem; }

/* Link contrast and focus */
a { color: var(--color-primary); text-decoration: underline; text-underline-offset: 3px; }
a:focus, a:focus-visible, button:focus, input:focus {
  box-shadow: var(--focus-ring);
  outline: none;
  border-radius: 8px;
}

/* Buttons accessibility */
.btn { font-weight: 600; font-size: 0.98rem; }
.btn:focus { box-shadow: var(--focus-ring); outline: none; }

/* Skip link (useful for keyboard users) */
.skip-link {
  position: absolute;
  left: 12px;
  top: -40px;
  background: #fff;
  color: var(--color-primary);
  padding: 8px 12px;
  border-radius: 6px;
  box-shadow: 0 6px 18px rgba(15,23,42,0.08);
  z-index: 9999;
  transition: top 160ms ease;
}
.skip-link:focus {
  top: 12px;
}

/* Increase tap targets and spacing for interactive elements */
.header-actions .search input[type="search"],
.partner-btn, .btn {
  min-height: 40px;
  padding-left: 12px;
  padding-right: 12px;
}

/* Card accessibility: role and focus */
.card { position: relative; }
.card a { display: block; color: inherit; }
.card a:focus { box-shadow: var(--focus-ring); border-radius: 8px; }

/* Improve contrast for blockquote */
blockquote { background: linear-gradient(90deg,#fffaf0,#fff8f2); color: var(--color-text); }

/* High contrast mode toggle fallback */
@media (prefers-contrast: more) {
  :root { --color-text: #04111a; --color-neutral-light: #ffffff; }
  .site-footer { background: #082433; }
}

/* Responsive heading adjustments */
@media (min-width: 768px) {
  h1 { font-size: 40px; }
  h2 { font-size: 28px; }
}

/* Ensure images have visible focus outlines when interactive */
img[tabindex], .partner-card:focus img { outline: 3px solid rgba(11,110,106,0.12); outline-offset: 3px; }

/* Ensure form controls have clear focus and accessible labels */
input[type="search"], input[type="email"], input[type="number"], button, select, textarea {
  border-radius: 8px;
  border: 1px solid rgba(15,23,42,0.06);
}

/* Utility: visually-hidden focusable - keep for skip link label */
.visually-hidden-focusable:focus {
  position: static;
  width: auto;
  height: auto;
  overflow: visible;
  clip: auto;
}

/* End of accessibility overrides */