/* ==========================================================================
   Base & Custom Properties
   ========================================================================== */
:root {
  --color-primary: #194de3;
  --color-accent: #fe9f35;
  --color-primary-light: rgba(25, 77, 227, 0.08);
  --color-accent-light: rgba(254, 159, 53, 0.1);
  --bg-body: #f4f7fb;
  --bg-surface: #ffffff;
  --text-main: #2d3748;
  --text-muted: #718096;
  --border-color: #e2e8f0;
}

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

body {
  background-color: var(--bg-body);
  font-family: 'Sora', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  margin: 0;
  padding: 0;
  color: var(--text-main);
  -webkit-font-smoothing: antialiased;
}

/* ==========================================================================
   Layout
   ========================================================================== */
main {
  background-color: var(--bg-surface);
  max-width: 860px;
  margin: 3rem auto;
  padding: 3rem 4rem;
  border-radius: 16px;
  box-shadow: 0 10px 40px rgba(25, 77, 227, 0.05);
}

/* ==========================================================================
   Typography
   ========================================================================== */
h1 {
  font-size: 2.25rem;
  font-weight: 800;
  color: #1a202c;
  margin-top: 1rem;
  line-height: 1.3;
}

h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: #1a202c;
  margin-top: 2.5rem;
  margin-bottom: 1.5rem;
  position: relative;
  display: inline-block;
}

h2::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 40%;
  height: 4px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

h3 {
  font-size: 1.35rem;
  font-weight: 600;
  color: #2d3748;
  margin-top: 2rem;
}

h4 {
  font-size: 1.1rem;
  font-weight: 600;
  color: #2d3748;
  margin-top: 1.5rem;
}

p {
  margin: 1rem 0;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  transition: all 0.2s ease-in-out;
}

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

main p a {
  border-bottom: 1px solid var(--color-primary-light);
}

main p a:hover {
  border-bottom-color: var(--color-accent);
}

ul, ol {
  padding-left: 1.5rem;
  margin: 1rem 0;
}

li {
  margin-bottom: 0.4rem;
}

hr {
  border: none;
  border-top: 2px solid var(--border-color);
  margin: 2.5rem 0;
}

blockquote {
  background-color: var(--color-primary-light);
  border-left: 5px solid var(--color-primary);
  padding: 1.25rem 1.5rem;
  margin: 2rem 0;
  color: var(--text-main);
  border-radius: 0 12px 12px 0;
  font-style: normal;
  font-size: 1.05rem;
}

code {
  background: var(--color-primary-light);
  padding: 0.2em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
}

em {
  font-style: italic;
  color: var(--text-muted);
  font-size: 0.95em;
}

/* ==========================================================================
   Header, Footer & Navigation
   ========================================================================== */
header, footer {
  background-color: var(--color-primary);
  color: #ffffff;
  padding: 1.25rem 0;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

header a, footer a {
  color: #ffffff;
  font-weight: 400;
  border-bottom: none !important;
}

header a:hover, footer a:hover {
  color: #ffffff;
  opacity: 1;
}

nav {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  max-width: 860px;
  margin: 0 auto;
  padding: 0 1rem;
}

nav a {
  opacity: 0.9;
}

nav a:hover {
  opacity: 1;
  color: #ffffff;
}

nav a.active {
  background-color: var(--color-accent);
  color: #ffffff;
  font-weight: 600;
  border-radius: 8px;
  padding: 0.4rem 1rem;
  opacity: 1;
  box-shadow: 0 2px 8px rgba(254, 159, 53, 0.4);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1rem;
  margin-right: auto;
  text-decoration: none;
  opacity: 1 !important;
}

.logo span {
  color: #ffffff;
}

.logo svg {
  flex-shrink: 0;
}

/* ==========================================================================
   Tables
   ========================================================================== */
.table-wrapper {
  overflow-x: auto;
  margin: 2rem 0;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.04);
  border: 1px solid var(--border-color);
}

table {
  width: 100%;
  border-collapse: collapse;
  background-color: #ffffff;
}

table th {
  background-color: var(--color-primary);
  color: #ffffff;
  padding: 1rem;
  text-align: left;
  font-weight: 600;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.2s ease;
  vertical-align: middle;
}

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

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

/* ==========================================================================
   Author Block
   ========================================================================== */
.author-block {
  background-color: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  gap: 1.5rem;
  align-items: center;
  margin: 2rem 0 2.5rem 0;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02);
}

.author-block img {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--color-primary-light);
  flex-shrink: 0;
}

.author-block strong {
  display: block;
  font-size: 1.05rem;
  color: #1a202c;
  margin-bottom: 0.25rem;
}

.author-block span {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ==========================================================================
   FAQ Section (Accordion Style)
   ========================================================================== */
.faq {
  margin-top: 3rem;
}

.faq h2 {
  margin-bottom: 2rem;
}

.faq-item {
  margin-bottom: 1rem;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item:hover {
  border-color: #cbd5e1;
}

.faq-item button.faq-question {
  width: 100%;
  text-align: left;
  background: #f8fafc;
  border: none;
  padding: 1.2rem 1.5rem;
  font-size: 1.0rem;
  cursor: pointer;
  color: var(--text-main);
  font-weight: 600;
  font-family: inherit;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color 0.2s ease;
  gap: 1rem;
}

.faq-item button.faq-question::after {
  content: "+";
  font-size: 1.5rem;
  color: var(--color-primary);
  font-weight: 400;
  line-height: 1;
  flex-shrink: 0;
}

.faq-item.open {
  border-color: var(--color-primary);
  box-shadow: 0 2px 10px var(--color-primary-light);
}

.faq-item.open button.faq-question {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.faq-item.open button.faq-question::after {
  content: "−";
}

.faq-item .faq-answer {
  display: none;
  padding: 0 1.5rem 1.5rem 1.5rem;
  color: var(--text-muted);
  line-height: 1.7;
  background: var(--color-primary-light);
}

.faq-item .faq-answer p:first-child {
  margin-top: 1rem;
}

.faq-item .faq-answer ol,
.faq-item .faq-answer ul {
  margin-top: 0.75rem;
}

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

/* ==========================================================================
   Mobile Responsive Styles
   ========================================================================== */
@media (max-width: 768px) {
  nav {
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
  }

  .logo {
    width: 100%;
    justify-content: center;
    margin-right: 0;
  }

  main {
    margin: 1rem;
    padding: 1.5rem;
    border-radius: 12px;
  }

  h1 {
    font-size: 1.6rem;
  }

  h2 {
    font-size: 1.35rem;
  }

  h3 {
    font-size: 1.15rem;
  }

  .author-block {
    flex-direction: column;
    text-align: center;
  }

  table th,
  table td {
    padding: 0.6rem 0.75rem;
    font-size: 0.85rem;
  }

  .faq-item button.faq-question {
    font-size: 0.95rem;
    padding: 1rem 1.25rem;
  }
}