:root {
  /* Brand */
  --color-primary: #146b4a;
  --color-primary-dark: #0d4f36;
  --color-primary-light: #2e8b68;

  /* Accent */
  --color-accent: #d4a84f;

  /* Backgrounds */
  --color-background: #f7f9f8;
  --color-surface: #ffffff;
  --color-surface-dark: #eaf1ed;

  /* Text */
  --color-text: #17221d;
  --color-text-muted: #66736d;
  --color-text-light: #ffffff;

  /* Borders */
  --color-border: #dce5e0;

  /* Status */
  --color-success: #198754;
  --color-warning: #d4a84f;
  --color-danger: #c94c4c;
}

/* =========================
   RESET
========================= */

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  color: var(--color-text);
  background: var(--color-background);
  line-height: 1.7;
}

/* =========================
   CONTAINER
========================= */

.container {
  width: min(1100px, calc(100% - 40px));
  margin: 0 auto;
}

/* =========================
   HEADER
========================= */

.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.logo {
  text-decoration: none;
  color: var(--color-text);
  font-size: 22px;
  font-weight: 800;
  white-space: nowrap;
}

.logo span {
  color: var(--color-primary);
}

.main-nav {
  display: flex;
  gap: 24px;
}

.main-nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: color 0.2s ease;
}

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

.main-nav .disclaimer {
  color: var(--color-danger);
}

/* =========================
   ARTICLE
========================= */

.post {
  background: var(--color-surface);
  margin: 50px auto;
  box-shadow: 0 5px 25px rgba(0, 0, 0, 0.06);
}

.post-header {
  max-width: 850px;
  margin: 0 auto;
  padding: 65px 30px 40px;
  text-align: center;
}

.category {
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 1px;
  margin-bottom: 15px;
}

h1 {
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1.15;
  color: var(--color-text);
  margin-bottom: 22px;
}

.lead {
  font-size: 19px;
  color: var(--color-text-muted);
  max-width: 720px;
  margin: 0 auto 22px;
}

.post-meta {
  display: flex;
  justify-content: center;
  gap: 10px;
  color: var(--color-text-muted);
  font-size: 14px;
}

/* =========================
   HERO
========================= */

.hero-image {
  width: 100%;
  height: 420px;
  background: var(--color-surface-dark);
}

.hero-placeholder {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 18px;
  letter-spacing: 2px;
}

/* =========================
   CONTENT LAYOUT
========================= */

.post-layout {
  max-width: 950px;
  margin: 0 auto;
  padding: 55px 30px 70px;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 55px;
}

/* =========================
   SIDEBAR / TOC
========================= */

.sidebar {
  position: relative;
}

.toc {
  position: sticky;
  top: 100px;
  border-left: 3px solid var(--color-primary);
  padding-left: 18px;
}

.toc h3 {
  font-size: 15px;
  margin-bottom: 12px;
  color: var(--color-text);
}

.toc a {
  display: block;
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.5;
  margin: 10px 0;
  transition: color 0.2s ease;
}

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

/* =========================
   ARTICLE CONTENT
========================= */

.post-content {
  font-size: 17px;
}

.post-content p {
  margin-bottom: 2px;
}

.post-content h2 {
  font-size: 29px;
  line-height: 1.3;
  margin: 45px 0 18px;
  color: var(--color-text);
  scroll-margin-top: 100px;
}

.post-content ul {
  margin: 0 0 25px 25px;
}

.post-content li {
  margin-bottom: 8px;
}

/* =========================
   INFO BOX
========================= */

.info-box {
  background: var(--color-surface-dark);
  border-left: 4px solid var(--color-primary);
  padding: 18px 20px;
  margin: 30px 0;
}

/* =========================
   BLOCKQUOTE
========================= */

blockquote {
  margin: 35px 0;
  padding: 25px 30px;
  background: var(--color-surface-dark);
  border-left: 4px solid var(--color-accent);
  font-size: 19px;
  font-style: italic;
  color: var(--color-text-muted);
}

/* =========================
   CHECKLIST
========================= */

.checklist {
  border: 1px solid var(--color-border);
  padding: 25px;
  margin: 35px 0;
  background: var(--color-surface);
}

.checklist h3 {
  margin-bottom: 15px;
}

.checklist label {
  display: block;
  margin: 10px 0;
}

.checklist input {
  margin-right: 10px;
  accent-color: var(--color-primary);
}

/* =========================
   AUTHOR
========================= */

.author {
  display: flex;
  align-items: center;
  gap: 15px;
  border-top: 1px solid var(--color-border);
  margin-top: 50px;
  padding-top: 25px;
}

.author-avatar {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
}

.author p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 14px;
}

/* =========================
   FOOTER
========================= */

.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.75);
  text-align: center;
  padding: 30px 0;
  font-size: 13px;
}

/* =========================
   MOBILE
========================= */

@media (max-width: 800px) {
  .header-inner {
    flex-direction: column;
    padding: 18px 0;
  }

  .main-nav {
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px 18px;
  }

  .post {
    margin: 25px auto;
  }

  .hero-image {
    height: 260px;
  }

  .post-layout {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .toc {
    position: static;
  }

  .post-content h2 {
    scroll-margin-top: 140px;
  }
}

@media (max-width: 500px) {
  .container {
    width: min(100% - 24px, 1100px);
  }

  .post-header {
    padding: 40px 18px 30px;
  }

  .post-layout {
    padding: 35px 18px 50px;
  }

  .lead {
    font-size: 17px;
  }

  .post-content {
    font-size: 16px;
  }
}