/* KidFlow Parent – Chính sách quyền riêng tư */

:root {
  --color-primary: #25B5C0;
  --color-primary-dark: #1A939C;
  --color-primary-soft: rgba(37, 181, 192, 0.12);
  --color-text: #111827;
  --color-text-secondary: #667085;
  --color-bg: #F7F9FC;
  --color-card: #FFFFFF;
  --color-border: #E4E7EC;
  --color-placeholder-bg: #FFF7ED;
  --color-placeholder-text: #C2410C;
  --color-placeholder-border: #FDBA74;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(17, 24, 39, 0.06), 0 4px 16px rgba(17, 24, 39, 0.04);
  --header-height: 72px;
  --max-width: 1120px;
  --toc-width: 280px;
  --focus-ring: 0 0 0 3px rgba(37, 181, 192, 0.45);
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-primary-dark);
  text-decoration: none;
  transition: color var(--transition), background-color var(--transition);
}

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

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 1000;
  padding: 0.75rem 1rem;
  background: var(--color-primary);
  color: #fff;
  font-weight: 600;
  border-radius: 8px;
}

.skip-link:focus {
  top: 16px;
  color: #fff;
  text-decoration: none;
  box-shadow: var(--focus-ring);
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  gap: 1rem;
}

.brand {
  min-width: 0;
}

.logo {
  display: inline-block;
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
  text-decoration: none;
}

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

.brand-tagline {
  margin: 0.15rem 0 0;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

.top-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem 1rem;
  flex-shrink: 0;
}

.top-nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: 0.35rem 0.25rem;
}

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

/* Hero */
.hero {
  padding: 2.5rem 0 2rem;
  background:
    linear-gradient(180deg, rgba(37, 181, 192, 0.08) 0%, transparent 100%),
    var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.hero h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.25;
  color: var(--color-text);
}

.hero-meta {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.5rem;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

.meta-sep {
  color: var(--color-border);
}

/* Layout */
.layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  padding-top: 1.75rem;
  padding-bottom: 3rem;
  align-items: start;
}

/* TOC */
.toc-sidebar {
  position: relative;
}

.toc-panel {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.toc-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.15rem;
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.toc-summary::-webkit-details-marker {
  display: none;
}

.toc-chevron {
  width: 0.5rem;
  height: 0.5rem;
  border-right: 2px solid var(--color-text-secondary);
  border-bottom: 2px solid var(--color-text-secondary);
  transform: rotate(45deg);
  transition: transform var(--transition);
  margin-top: -0.25rem;
}

.toc-panel[open] .toc-chevron {
  transform: rotate(-135deg);
  margin-top: 0.15rem;
}

.toc-nav {
  padding: 0 0.75rem 1rem;
  border-top: 1px solid var(--color-border);
}

.toc-list {
  margin: 0.75rem 0 0;
  padding: 0;
  list-style: none;
}

.toc-list li {
  margin: 0;
}

.toc-list a {
  display: block;
  padding: 0.45rem 0.5rem;
  font-size: 0.875rem;
  line-height: 1.45;
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: 6px;
  border-left: 2px solid transparent;
}

.toc-list a:hover {
  color: var(--color-primary);
  background: var(--color-primary-soft);
  text-decoration: none;
}

.toc-list a.is-active {
  color: var(--color-primary-dark);
  background: var(--color-primary-soft);
  border-left-color: var(--color-primary);
  font-weight: 600;
}

/* Content card */
.content-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.75rem 1.5rem;
}

.doc-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.doc-title {
  margin: 0 0 0.75rem;
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.35;
  text-transform: uppercase;
  color: var(--color-text);
}

.doc-dates {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.policy-section {
  margin-bottom: 2.25rem;
  scroll-margin-top: calc(var(--header-height) + 16px);
}

.policy-section:last-child {
  margin-bottom: 0;
}

.policy-section h2 {
  margin: 0 0 1rem;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.35;
  color: var(--color-text);
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-primary-soft);
}

.policy-section h3 {
  margin: 1.5rem 0 0.75rem;
  font-size: 1.0625rem;
  font-weight: 650;
  color: var(--color-text);
}

.policy-section p {
  margin: 0 0 1rem;
  color: var(--color-text);
}

.policy-section ul {
  margin: 0 0 1.15rem;
  padding-left: 1.35rem;
}

.policy-section li {
  margin-bottom: 0.5rem;
  padding-left: 0.15rem;
}

.policy-section li:last-child {
  margin-bottom: 0;
}

.contact-block {
  margin: 0;
  font-style: normal;
  padding: 1.15rem 1.25rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
}

.contact-block p {
  margin: 0 0 0.5rem;
}

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

/* Placeholder markers */
.placeholder {
  display: inline;
  padding: 0.1em 0.35em;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.9em;
  font-weight: 600;
  color: var(--color-placeholder-text);
  background: var(--color-placeholder-bg);
  border: 1px dashed var(--color-placeholder-border);
  border-radius: 4px;
  white-space: nowrap;
}

/* Footer */
.site-footer {
  background: #fff;
  border-top: 1px solid var(--color-border);
  padding: 2rem 0 2.5rem;
}

.footer-inner {
  display: grid;
  gap: 1.25rem;
}

.footer-name {
  margin: 0;
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-text);
}

.footer-org {
  margin: 0.2rem 0 0;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.footer-contact {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.footer-contact p {
  margin: 0 0 0.35rem;
}

.footer-copy {
  margin: 0;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

/* Back to top */
.back-to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 90;
  padding: 0.65rem 1rem;
  font-family: inherit;
  font-size: 0.8125rem;
  font-weight: 600;
  color: #fff;
  background: var(--color-primary);
  border: none;
  border-radius: 999px;
  box-shadow: 0 4px 14px rgba(37, 181, 192, 0.35);
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), opacity var(--transition);
}

.back-to-top:hover {
  background: var(--color-primary-dark);
}

.back-to-top:active {
  transform: translateY(1px);
}

.back-to-top[hidden] {
  display: none;
}

/* Desktop layout */
@media (min-width: 900px) {
  .layout {
    grid-template-columns: var(--toc-width) minmax(0, 1fr);
    gap: 2rem;
    padding-top: 2.25rem;
    padding-bottom: 4rem;
  }

  .toc-sidebar {
    position: sticky;
    top: calc(var(--header-height) + 1.25rem);
    align-self: start;
  }

  /* Keep TOC expanded and hide toggle chrome on desktop */
  .toc-summary {
    pointer-events: none;
    cursor: default;
  }

  .toc-chevron {
    display: none;
  }

  .content-card {
    padding: 2.5rem 2.75rem;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .footer-copy {
    grid-column: 1 / -1;
  }
}

@media (max-width: 899px) {
  .hero {
    padding: 1.75rem 0 1.5rem;
  }

  .content-card {
    padding: 1.35rem 1.15rem;
  }

  .top-nav a:first-child {
    display: none;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}

/* Print styles */
@media print {
  :root {
    --color-bg: #fff;
  }

  body {
    background: #fff;
    color: #000;
    font-size: 11pt;
    line-height: 1.5;
  }

  .skip-link,
  .site-header,
  .toc-sidebar,
  .back-to-top,
  .top-nav {
    display: none !important;
  }

  .hero {
    padding: 0 0 1rem;
    background: none;
    border: none;
  }

  .hero h1 {
    font-size: 18pt;
  }

  .layout {
    display: block;
    padding: 0;
    max-width: none;
  }

  .container {
    max-width: none;
    padding: 0;
  }

  .content-card {
    border: none;
    box-shadow: none;
    padding: 0;
  }

  .policy-section {
    break-inside: avoid;
    page-break-inside: avoid;
  }

  .policy-section h2 {
    border-bottom-color: #ccc;
  }

  a {
    color: #000;
    text-decoration: none;
  }

  .placeholder {
    background: none;
    border: 1px solid #999;
    color: #000;
  }

  .site-footer {
    border-top: 1px solid #ccc;
    margin-top: 2rem;
  }

  .footer-copy {
    border-top-color: #ccc;
  }
}