/* =============================================
   TheTechy — Global Stylesheet
   Editorial minimal blog with monospaced accents
   ============================================= */

/* --- Google Fonts Import --- */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,700;1,400&family=DM+Sans:wght@300;400;500&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- CSS Variables --- */
:root {
  --color-bg: #f9f7f4;
  /* warm off-white */
  --color-surface: #ffffff;
  --color-border: #e2ddd8;
  --color-muted: #9a9189;
  --color-text: #1a1714;
  /* near-black */
  --color-text-soft: #4a4540;
  --color-accent: #e8a020;
  /* amber */
  --color-accent-dk: #c47f0a;
  --color-code-bg: #1c1917;
  /* dark stone */
  --color-code-text: #e7e3dc;

  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  --max-w: 720px;
  --max-w-wide: 1100px;

  --radius: 4px;
  --transition: 0.18s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

/* --- Typography --- */
h1,
h2,
h3,
h4,
h5 {
  font-family: var(--font-display);
  line-height: 1.2;
  color: var(--color-text);
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

h3 {
  font-size: clamp(1.15rem, 2.5vw, 1.4rem);
}

h4 {
  font-size: 1.1rem;
}

p {
  margin-bottom: 1.25rem;
  color: var(--color-text-soft);
}

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

/* --- Layout Helpers --- */
.container {
  width: 100%;
  max-width: var(--max-w-wide);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2.5rem);
}

.container--narrow {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

/* =============================================
   SITE HEADER & NAV
   ============================================= */
.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.site-logo {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.site-logo .logo-bracket {
  color: var(--color-accent);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.site-nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-soft);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  transition: color var(--transition);
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-text);
}

.site-nav a.active {
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 2px;
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition);
}

/* =============================================
   SITE FOOTER
   ============================================= */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 2.5rem 0;
  margin-top: 5rem;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-logo {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--color-muted);
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--color-muted);
  margin: 0;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  font-size: 0.8rem;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--color-text);
}

/* =============================================
   BUTTONS & LINKS
   ============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius);
  border: 1.5px solid currentColor;
  transition: var(--transition);
  cursor: pointer;
}

.btn--primary {
  background: var(--color-text);
  color: var(--color-bg);
  border-color: var(--color-text);
}

.btn--primary:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-text);
}

.btn--outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn--outline:hover {
  border-color: var(--color-text);
}

.read-more {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--color-accent-dk);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: gap var(--transition), color var(--transition);
}

.read-more:hover {
  gap: 0.6rem;
  color: var(--color-text);
}

.read-more::after {
  content: '→';
}

/* =============================================
   META / TAGS
   ============================================= */
.meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-muted);
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.meta .dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--color-border);
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--color-border);
  color: var(--color-text-soft);
  padding: 0.2rem 0.55rem;
  border-radius: 2px;
}

.tag--accent {
  background: #fef3d0;
  color: var(--color-accent-dk);
}

/* =============================================
   POST CARDS
   ============================================= */
.post-card {
  border-top: 1px solid var(--color-border);
  padding: 2rem 0;
  display: grid;
  gap: 0.75rem;
}

.post-card:last-child {
  border-bottom: 1px solid var(--color-border);
}

.post-card__title {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  line-height: 1.3;
  transition: color var(--transition);
}

.post-card__title a:hover {
  color: var(--color-accent-dk);
}

.post-card__excerpt {
  font-size: 0.95rem;
  color: var(--color-text-soft);
  margin: 0;
  line-height: 1.6;
  max-width: 60ch;
}

.post-card--featured {
  padding: 2.5rem 0 2rem;
}

.post-card--featured .post-card__title {
  font-size: clamp(1.35rem, 3vw, 1.8rem);
}

/* =============================================
   HERO
   ============================================= */
.hero {
  padding: 5rem 0 3.5rem;
  border-bottom: 1px solid var(--color-border);
}

.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: 1.2rem;
}

.hero__title {
  font-size: clamp(2.8rem, 8vw, 5.5rem);
  font-weight: 700;
  line-height: 1.0;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
}

.hero__title em {
  font-style: italic;
  color: var(--color-muted);
}

.hero__tagline {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: var(--color-text-soft);
  max-width: 44ch;
  margin: 0;
  line-height: 1.6;
}

/* =============================================
   SECTION HEADERS
   ============================================= */
.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-bottom: 0.75rem;
  margin-bottom: 0;
  gap: 1rem;
}

.section-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-muted);
  font-weight: 500;
}

.section {
  padding: 4rem 0;
}

/* =============================================
   ARTICLE CONTENT (post body)
   ============================================= */
.article-header {
  padding: 3.5rem 0 2.5rem;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 3rem;
}

.article-header__title {
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  line-height: 1.15;
  margin-bottom: 1.25rem;
}

.article-body {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--color-text-soft);
}

.article-body h2 {
  font-size: 1.5rem;
  margin: 2.5rem 0 1rem;
  color: var(--color-text);
}

.article-body h3 {
  font-size: 1.2rem;
  margin: 2rem 0 0.75rem;
  color: var(--color-text);
}

.article-body p {
  margin-bottom: 1.5rem;
}

.article-body a {
  color: var(--color-accent-dk);
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 3px;
  transition: text-decoration-color var(--transition);
}

.article-body a:hover {
  text-decoration-color: var(--color-accent-dk);
}

.article-body ul,
.article-body ol {
  padding-left: 1.5rem;
  margin-bottom: 1.5rem;
}

.article-body li {
  margin-bottom: 0.4rem;
}

.article-body blockquote {
  border-left: 3px solid var(--color-accent);
  padding: 0.75rem 1.25rem;
  margin: 2rem 0;
  background: #fef9f0;
  border-radius: 0 var(--radius) var(--radius) 0;
}

.article-body blockquote p {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.1rem;
  color: var(--color-text);
  margin: 0;
}

.article-body img {
  border-radius: var(--radius);
  margin: 2rem 0;
  width: 100%;
}

/* --- Inline & Block Code --- */
.article-body code,
code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--color-border);
  color: var(--color-text);
  padding: 0.15em 0.4em;
  border-radius: 3px;
}

.article-body pre,
pre {
  background: var(--color-code-bg);
  border-radius: var(--radius);
  padding: 1.5rem;
  overflow-x: auto;
  margin: 1.75rem 0;
  position: relative;
}

.article-body pre code,
pre code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  background: none;
  color: var(--color-code-text);
  padding: 0;
  line-height: 1.7;
  border-radius: 0;
}

/* Code block language badge */
pre[data-lang]::before {
  content: attr(data-lang);
  position: absolute;
  top: 0.75rem;
  right: 1rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #6b6560;
}

/* Syntax highlight tokens */
.token-kw {
  color: #e8a020;
}

.token-fn {
  color: #79c0ff;
}

.token-str {
  color: #a5d6a7;
}

.token-cm {
  color: #6b6560;
  font-style: italic;
}

.token-num {
  color: #f48fb1;
}

.token-cls {
  color: #ffcc80;
}

/* =============================================
   COURSE PAGE
   ============================================= */
.course-hero {
  padding: 4rem 0 3rem;
  border-bottom: 1px solid var(--color-border);
}

.course-hero__badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent-dk);
  background: #fef3d0;
  padding: 0.3rem 0.7rem;
  border-radius: 2px;
  display: inline-block;
  margin-bottom: 1.25rem;
}

.course-stats {
  display: flex;
  gap: 2.5rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.course-stat {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.course-stat__value {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
}

.course-stat__label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
}

.toc-nav {
  position: sticky;
  top: 80px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
}

.toc-title {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-muted);
  margin-bottom: 1rem;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.toc-list li a {
  font-size: 0.875rem;
  color: var(--color-text-soft);
  padding: 0.35rem 0.6rem;
  display: block;
  border-radius: var(--radius);
  transition: background var(--transition), color var(--transition);
  border-left: 2px solid transparent;
}

.toc-list li a:hover,
.toc-list li.active a {
  background: var(--color-border);
  color: var(--color-text);
  border-left-color: var(--color-accent);
}

.toc-list li.section-heading>a {
  font-weight: 500;
  font-size: 0.8rem;
  color: var(--color-text);
  pointer-events: none;
  padding-left: 0;
  margin-top: 0.75rem;
}

.lesson-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  transition: border-color var(--transition), transform var(--transition);
  background: var(--color-surface);
}

.lesson-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-1px);
}

.lesson-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--color-muted);
  min-width: 2rem;
  padding-top: 0.2rem;
}

.lesson-card__title {
  font-size: 1rem;
  margin-bottom: 0.3rem;
}

.lesson-card__desc {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin: 0;
  line-height: 1.5;
}

/* =============================================
   ARCHIVE PAGE
   ============================================= */
.archive-year {
  padding: 2.5rem 0 0;
}

.archive-year__heading {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-border);
  margin-bottom: 0.5rem;
  line-height: 1;
}

.archive-month {
  padding: 1.25rem 0;
  border-top: 1px solid var(--color-border);
}

.archive-month__heading {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-muted);
  margin-bottom: 0.75rem;
}

.archive-post-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.archive-post-list li {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.35rem 0;
}

.archive-post-list .post-date {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-muted);
  min-width: 2.5rem;
}

.archive-post-list a {
  font-size: 0.95rem;
  color: var(--color-text-soft);
  transition: color var(--transition);
}

.archive-post-list a:hover {
  color: var(--color-text);
}

/* =============================================
   ABOUT PAGE
   ============================================= */
.about-rule {
  width: 3rem;
  height: 3px;
  background: var(--color-accent);
  margin: 1.5rem 0;
  border: none;
}

/* =============================================
   MODULE PAGE
   ============================================= */
.module-progress {
  background: var(--color-border);
  height: 3px;
  border-radius: 99px;
  margin-bottom: 3rem;
  position: relative;
}

.module-progress__fill {
  background: var(--color-accent);
  height: 100%;
  border-radius: 99px;
  transition: width 0.4s ease;
}

.objectives-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  background: #fef9f0;
  border: 1px solid #f0e4c8;
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 2.5rem;
}

.objectives-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.95rem;
  color: var(--color-text-soft);
}

.objectives-list li::before {
  content: '✓';
  color: var(--color-accent);
  font-weight: 700;
  font-size: 0.85rem;
  margin-top: 0.15rem;
  flex-shrink: 0;
}

.module-nav {
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  gap: 1rem;
  padding: 2.5rem 0 0;
  border-top: 1px solid var(--color-border);
  margin-top: 4rem;
}

.module-nav__btn {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color var(--transition);
  max-width: 45%;
  background: var(--color-surface);
}

.module-nav__btn:hover {
  border-color: var(--color-accent);
}

.module-nav__btn--next {
  text-align: right;
  margin-left: auto;
}

.module-nav__label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-muted);
}

.module-nav__title {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
}

/* =============================================
   COURSE LAYOUT (sidebar + content)
   ============================================= */
.course-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 4rem;
  padding: 3rem 0;
  align-items: start;
}

/* =============================================
   DIVIDERS
   ============================================= */
.divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 3rem 0;
}

/* =============================================
   RESPONSIVE BREAKPOINTS
   ============================================= */
@media (max-width: 900px) {
  .course-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .toc-nav {
    position: static;
    max-height: none;
  }
}

@media (max-width: 640px) {
  .site-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 0.5rem 0;
    z-index: 99;
  }

  .site-nav.open {
    display: flex;
  }

  .site-nav a {
    padding: 0.75rem 1.5rem;
    width: 100%;
  }

  .nav-toggle {
    display: flex;
  }

  .header-inner {
    position: relative;
  }

  .module-nav {
    flex-direction: column;
  }

  .module-nav__btn {
    max-width: 100%;
  }

  .footer-inner {
    flex-direction: column;
    gap: 0.75rem;
  }

  .course-stats {
    gap: 1.5rem;
  }
}