/* =============================================
   CSS Variables
   ============================================= */
:root {
  --color-bg: #faf9f7;
  --color-surface: #ffffff;
  --color-text: #1c1c1c;
  --color-text-muted: #6b6b6b;
  --color-text-light: #9a9a9a;
  --color-accent: #1a1a2e;
  --color-accent-warm: #c8a96e;
  --color-border: #e5e2db;
  --color-border-light: #f0ede8;
  --color-header-bg: rgba(250, 249, 247, 0.94);

  --font-serif: 'Lora', Georgia, 'Times New Roman', serif;
  --font-sans: 'Source Sans 3', 'Helvetica Neue', Arial, sans-serif;

  --container-max: 740px;
  --container-padding: 1.5rem;

  --radius-sm: 4px;
  --radius-md: 6px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.07);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.08);

  --transition: 0.2s ease;
}

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

html {
  font-size: 18px;
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* =============================================
   Header
   ============================================= */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-header-bg);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}

header.scrolled {
  border-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: calc(var(--container-max) + var(--container-padding) * 2);
  margin: 0 auto;
  padding: 0.9rem var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
  color: var(--color-text);
  flex-shrink: 0;
}

.logo svg {
  flex-shrink: 0;
}

.logo-text {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--color-accent);
}

.logo-dot {
  color: var(--color-accent-warm);
}

/* Nav */
nav ul {
  list-style: none;
  display: flex;
  gap: 1.4rem;
  align-items: center;
}

nav a {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: color var(--transition);
}

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

/* =============================================
   Main container
   ============================================= */
main {
  padding: 3rem 0 4rem;
}

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

/* =============================================
   H1
   ============================================= */
h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.55rem, 3.5vw, 2.05rem);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-accent);
  letter-spacing: -0.02em;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

/* =============================================
   Intro section
   ============================================= */
.intro {
  margin-bottom: 2rem;
}

.intro p {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 1rem;
}

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

/* =============================================
   Author box
   ============================================= */
.author-box {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 2.5rem;
}

.author-photo {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 2px solid var(--color-border);
}

.author-info {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.author-name {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
}

.author-date {
  font-size: 0.78rem;
  color: var(--color-text-light);
  font-style: italic;
}

/* =============================================
   Article content
   ============================================= */
.content {
  font-size: 0.97rem;
}

/* Headings */
.content h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.2rem, 2.5vw, 1.45rem);
  font-weight: 600;
  color: var(--color-accent);
  line-height: 1.35;
  letter-spacing: -0.015em;
  margin-top: 2.8rem;
  margin-bottom: 1rem;
}

.content h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.4;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

/* Paragraphs */
.content p {
  margin-bottom: 1.1rem;
  color: var(--color-text);
}

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

/* Lists */
.content ul,
.content ol {
  margin: 0.5rem 0 1.1rem 1.4rem;
}

.content li {
  margin-bottom: 0.3rem;
  color: var(--color-text);
}

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

/* HR */
.content hr,
hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2.4rem 0;
}

/* Strong */
.content strong {
  font-weight: 600;
  color: var(--color-text);
}

/* Em / italic */
.content em {
  color: var(--color-text-muted);
}

/* Blockquote */
.content blockquote {
  border-left: 3px solid var(--color-accent-warm);
  margin: 1.5rem 0;
  padding: 0.6rem 1.2rem;
  background: var(--color-border-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--color-text-muted);
}

/* =============================================
   Tables
   ============================================= */
.table-wrapper {
  overflow-x: auto;
  margin: 1.2rem 0 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.83rem;
  min-width: 520px;
}

thead {
  background-color: var(--color-accent);
  color: #fff;
}

thead th {
  padding: 0.65rem 0.9rem;
  text-align: left;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

tbody tr {
  border-bottom: 1px solid var(--color-border-light);
  transition: background-color var(--transition);
}

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

tbody tr:nth-child(even) {
  background-color: #faf8f5;
}

tbody tr:hover {
  background-color: #f4f1eb;
}

tbody td {
  padding: 0.6rem 0.9rem;
  color: var(--color-text);
  vertical-align: top;
}

/* =============================================
   Disclaimer
   ============================================= */
.disclaimer {
  font-size: 0.8rem;
  color: var(--color-text-light);
  background: var(--color-border-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  margin-top: 2rem;
  line-height: 1.6;
}

/* =============================================
   Footer
   ============================================= */
footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  padding: 1.5rem 0;
}

.footer-inner {
  max-width: calc(var(--container-max) + var(--container-padding) * 2);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  text-align: center;
}

.footer-inner p {
  font-size: 0.78rem;
  color: var(--color-text-light);
}

/* =============================================
   Responsive
   ============================================= */
@media (max-width: 600px) {
  html {
    font-size: 16px;
  }

  :root {
    --container-padding: 1rem;
  }

  .header-inner {
    padding: 0.7rem var(--container-padding);
    gap: 0.75rem;
  }

  nav ul {
    gap: 0.9rem;
  }

  nav a {
    font-size: 0.72rem;
  }

  .logo-text {
    font-size: 0.9rem;
  }

  h1 {
    font-size: 1.4rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.2rem;
  }

  .author-box {
    padding: 0.85rem 1rem;
    gap: 0.75rem;
  }

  .author-photo {
    width: 44px;
    height: 44px;
  }

  .author-name {
    font-size: 0.88rem;
  }

  .content h2 {
    font-size: 1.2rem;
    margin-top: 2.2rem;
  }

  .content h3 {
    font-size: 1rem;
  }

  table {
    font-size: 0.77rem;
  }

  thead th,
  tbody td {
    padding: 0.5rem 0.65rem;
  }
}

@media (max-width: 400px) {
  nav ul {
    gap: 0.6rem;
  }

  nav a {
    font-size: 0.68rem;
    letter-spacing: 0.04em;
  }
}