/* ==========================================================================
   Lift With Dan — Core Stylesheet (PRD v2 Design System)
   Aesthetic: Warm Editorial meets Tactical Fitness
   Design Tokens: Cool Emerald & Slate with Native OS Dark Mode Support
   Typography: Fraunces (Headings) + Inter (Body) + Monospace (Metrics)
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Typography Imports
   -------------------------------------------------------------------------- */
@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,400..700;1,9..144,400..700&family=Inter:wght@400;500;600;700&display=swap');

/* --------------------------------------------------------------------------
   2. Design Tokens & Theme Variables
   -------------------------------------------------------------------------- */
:root {
  /* Light Mode Defaults */
  --bg-main: #f8fafc;        /* Slate 50 — clean canvas background */
  --bg-card: #ffffff;        /* Pure white card surface */
  --text-main: #0f172a;      /* Slate 900 — high-contrast readable copy */
  --text-muted: #64748b;     /* Slate 500 — subtle metadata & descriptions */
  --border-color: #e2e8f0;   /* Slate 200 — crisp 1px borders */

  --accent-green: #059669;   /* Emerald 600 — authoritative primary brand accent */
  --accent-hover: #047857;   /* Emerald 700 — button hover interaction */
  --accent-subtle: #f0fdf4;  /* Emerald 50 — delicate tint for tables and highlights */

  --font-heading: 'Fraunces', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, monospace;

  --radius: 6px;             /* Subtle, toned-down rectangular corners */
  --shadow-none: none;       /* Strict flat aesthetic — zero drop-shadows */

  /* Standard Spacing Scale */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 5rem;

  /* Layout Max Widths */
  --container-max: 1160px;
  --reading-max: 68ch;
}

/* --------------------------------------------------------------------------
   3. Native OS Dark Mode Defaults
   -------------------------------------------------------------------------- */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-main: #0d1117;      /* Deep slate dark canvas */
    --bg-card: #161b22;      /* Elevated dark card surface */
    --text-main: #f0f6fc;    /* High-legibility off-white */
    --text-muted: #8b949e;   /* Muted grey for supporting metadata */
    --border-color: #30363d; /* Subtle dark-mode border separator */

    --accent-green: #10b981; /* Emerald 500 — luminous in dark environments */
    --accent-hover: #34d399; /* Emerald 400 — energetic hover */
    --accent-subtle: #064e3b;/* Deep forest tint */
  }
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1 0 auto;
}

/* Headings with Fraunces Editorial Display */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-main);
  line-height: 1.25;
  font-weight: 600;
  letter-spacing: -0.015em;
}

h1 { font-size: 2.75rem; margin-bottom: var(--spacing-md); }
h2 { font-size: 2rem;    margin-bottom: var(--spacing-md); }
h3 { font-size: 1.35rem; margin-bottom: var(--spacing-sm); }
h4 { font-size: 1.1rem;  margin-bottom: var(--spacing-xs); }

p {
  margin-bottom: var(--spacing-md);
}

/* Lead paragraph — shared style for page intros */
p.lead {
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 0;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.15s ease;
}

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

ul, ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-lg);
}

li {
  margin-bottom: var(--spacing-xs);
}

/* --------------------------------------------------------------------------
   5. Reusable Layout Containers
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-lg);
  padding-right: var(--spacing-lg);
}

/* Sections that occupy a full-bleed padded block with a bottom border divider */
.section-block {
  padding-top: var(--spacing-xxl);
  padding-bottom: var(--spacing-xxl);
  border-bottom: 1px solid var(--border-color);
}

/* Last section on a page should not have a bottom border */
.section-block:last-of-type,
.section-block.no-border {
  border-bottom: none;
}

/* Section headings: eyebrow tag + title + optional subtitle */
.section-header {
  margin-bottom: var(--spacing-xl);
}

.section-header h2 {
  margin-bottom: var(--spacing-xs);
  margin-top: var(--spacing-xs);
}

.section-header p {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   6. Sticky Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bg-main);
  border-bottom: 1px solid var(--border-color);
  /* Backdrop blur softens the page content behind the header when scrolled */
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

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

.logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-main);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.logo:hover {
  color: var(--accent-green);
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.desktop-nav a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: var(--spacing-xs) 0;
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

/* --------------------------------------------------------------------------
   7. Mobile Navigation Toggle & Drawer
   -------------------------------------------------------------------------- */

/* Hamburger button — only visible on small screens */
.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.55rem 0.85rem;
  cursor: pointer;
  align-items: center;
  gap: var(--spacing-xs);
}

.menu-toggle:hover {
  border-color: var(--accent-green);
}

/*
  Mobile drawer sits FIXED directly under the sticky header so it
  is always visible regardless of scroll position.
  The --header-height custom property is set via JS on open so the
  drawer is precisely positioned flush under the header bar.
*/
.mobile-drawer {
  display: none;
  position: fixed;
  top: 72px; /* matches .header-inner height */
  left: 0;
  right: 0;
  z-index: 999; /* just below the header */
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: var(--spacing-lg);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08); /* subtle depth only on drawer — not cards */
}

.mobile-drawer.is-open {
  display: block;
}

.mobile-drawer a {
  display: block;
  font-size: 1.1rem;
  font-weight: 500;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
}

.mobile-drawer a:last-child {
  border-bottom: none;
}

/* CTA within the mobile drawer */
.mobile-drawer .cta-button {
  display: block;
  width: 100%;
  margin-top: var(--spacing-md);
  text-align: center;
}

/* --------------------------------------------------------------------------
   8. Buttons & Call-to-Actions (CTAs)
   -------------------------------------------------------------------------- */
.cta-button {
  background-color: var(--accent-green);
  color: #ffffff;
  padding: 0.65rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: 1px solid var(--accent-green);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1.2;
  gap: var(--spacing-xs);
  box-shadow: var(--shadow-none);
  white-space: nowrap;
}

.cta-button:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #ffffff;
}

/* Secondary outlined variant */
.cta-outline {
  background-color: transparent;
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.cta-outline:hover {
  background-color: var(--accent-subtle);
  border-color: var(--text-main);
  color: var(--text-main);
}

/* Groups of buttons side by side */
.button-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  align-items: center;
}

/* --------------------------------------------------------------------------
   9. Flat Cards
   -------------------------------------------------------------------------- */
/*
  The .card class is the single card primitive.
  No drop-shadows. No floating elevation.
  Interaction is signalled only through border-color change.
*/
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-none);
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s ease;
}

.card:hover {
  border-color: var(--accent-green);
}

.card-clickable {
  cursor: pointer;
}

.card-clickable:focus-visible {
  outline: 2px solid var(--accent-green);
  outline-offset: 2px;
}

/* Highlight card variant — used for CTAs on light emerald background */
.card.card-highlight {
  background-color: var(--accent-subtle);
  border-color: var(--accent-green);
}

/* --------------------------------------------------------------------------
   10. Tag Tokens & Metadata Labels
   -------------------------------------------------------------------------- */
/*
  Strictly NO rounded bubble/pill badges.
  All category and metadata labels use uppercase monospaced text
  with wide letter-spacing. This is the sole system for tagging.
*/
.tag-mono {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-green);
  margin-bottom: var(--spacing-sm);
  display: inline-block;
}

/* Muted variant for secondary metadata (dates, read times) */
.tag-mono.muted {
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   11. Card Inner Elements
   -------------------------------------------------------------------------- */
/* Card heading — sized appropriately inside a card */
.card-title {
  font-size: 1.35rem;
  margin-bottom: var(--spacing-xs);
}

/* Card body copy — muted, grows to fill space */
.card-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
  flex-grow: 1;
}

/* Card read-more link — monospaced uppercase */
.card-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-main);
  display: inline-flex;
  align-items: center;
  line-height: 1.2;
  gap: var(--spacing-xs);
  margin-top: auto;
}

.card:hover .card-link {
  color: var(--accent-green);
}

/* Card image block — bleeds to card edges, sits above content */
.card-media {
  margin: calc(-1 * var(--spacing-lg)) calc(-1 * var(--spacing-lg)) var(--spacing-md);
  overflow: hidden;
  border-top-left-radius: calc(var(--radius) - 1px);
  border-top-right-radius: calc(var(--radius) - 1px);
  border-bottom: 1px solid var(--border-color);
  aspect-ratio: 16 / 10;
  background-color: var(--border-color);
}

.card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.card:hover .card-media img {
  transform: scale(1.02);
}

/* --------------------------------------------------------------------------
   12. Grid Layouts
   -------------------------------------------------------------------------- */
/* 2-column grid (Pillars) */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

/* 3-column grid (Featured guides, articles) */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

/* --------------------------------------------------------------------------
   13. Page Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  padding-top: var(--spacing-xxl);
  padding-bottom: var(--spacing-xxl);
  border-bottom: 1px solid var(--border-color);
}

.hero-content {
  max-width: 820px;
}

.hero-title {
  font-size: 3.5rem;
  line-height: 1.15;
  margin-bottom: var(--spacing-md);
  font-weight: 700;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: var(--spacing-xl);
  max-width: 650px;
}

/* --------------------------------------------------------------------------
   14. Page Title Block (Hub & Utility Pages)
   -------------------------------------------------------------------------- */
/*
  Used on all non-homepage pages (Workouts, Nutrition, Mindset, Articles,
  Start Here). Provides the eyebrow tag, H1, and lead paragraph.
*/
.page-title-block {
  padding-top: var(--spacing-xxl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--border-color);
  margin-bottom: var(--spacing-xxl);
}

.page-title-block h1 {
  margin-top: var(--spacing-xs);
  margin-bottom: var(--spacing-sm);
}

.page-title-block .lead {
  max-width: 700px;
}

/* --------------------------------------------------------------------------
   15. About Dan Panel
   -------------------------------------------------------------------------- */
.about-panel {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: var(--spacing-xl);
}

.about-photo {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border-color);
  aspect-ratio: 4 / 5;
  background-color: var(--border-color);
}

.about-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-copy h3 {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
}

.about-credentials {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
}

.credential-item {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.credential-item strong {
  color: var(--text-main);
}

/* --------------------------------------------------------------------------
   16. Editorial Article Formatting
   -------------------------------------------------------------------------- */
/* Constrained reading column for long-form article content */
.reading-container {
  max-width: var(--reading-max);
  margin-left: auto;
  margin-right: auto;
}

/* Breadcrumb navigation trail */
.breadcrumbs {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: var(--spacing-lg);
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
  align-items: center;
}

.breadcrumbs a {
  color: var(--text-muted);
}

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

/* Article header block: date/read-time + H1 + intro line */
.article-header {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
}

.article-header h1 {
  font-size: 3rem;
  line-height: 1.15;
  margin-top: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

/* Monospaced metadata row: date · read time · author */
.article-meta {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
  flex-wrap: wrap;
}

/* Article body — slightly larger type and generous line-height for reading comfort */
.article-content {
  font-size: 1.1rem;
  line-height: 1.75;
}

.article-content h2 {
  font-size: 1.85rem;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.article-content h3 {
  font-size: 1.35rem;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
}

/* Blockquote: left-bordered emerald accent per PRD v2 */
blockquote {
  border-left: 2px solid var(--accent-green);
  padding-left: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
  font-family: var(--font-heading);
  font-size: 1.35rem;
  line-height: 1.5;
  color: var(--text-main);
}

/* Author bio box below articles */
.author-box {
  display: flex;
  gap: var(--spacing-lg);
  align-items: flex-start;
  margin-top: var(--spacing-xxl);
  padding: var(--spacing-lg);
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
}

.author-avatar {
  width: 72px;
  height: 72px;
  border-radius: var(--radius);
  overflow: hidden;
  flex-shrink: 0;
  border: 1px solid var(--border-color);
}

.author-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Author name */
.author-name {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}

/* Author bio copy */
.author-bio {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: var(--spacing-sm);
}

/* Author CTA link — monospaced emerald */
.author-cta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-green);
  display: inline-flex;
  align-items: center;
  line-height: 1.2;
  gap: var(--spacing-xs);
}

.author-cta:hover {
  color: var(--accent-hover);
}

/* --------------------------------------------------------------------------
   17. Data Tables & Training Log Matrices
   -------------------------------------------------------------------------- */
/*
  All workout data and macro tables use monospaced type in a
  horizontally-scrollable wrapper. No rounded chips around cells.
*/
.table-wrapper {
  width: 100%;
  overflow-x: auto;
  margin: var(--spacing-lg) 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
}

.data-matrix {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-align: left;
  background-color: var(--bg-card);
}

.data-matrix th,
.data-matrix td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
}

.data-matrix tr:last-child td {
  border-bottom: none;
}

.data-matrix th {
  background-color: var(--accent-subtle);
  color: var(--text-main);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.75rem;
}

.data-matrix.compact-values th:nth-child(n + 3),
.data-matrix.compact-values td:nth-child(n + 3) {
  white-space: nowrap;
}

/* --------------------------------------------------------------------------
   18. Step / Roadmap Cards
   -------------------------------------------------------------------------- */
.roadmap-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.step-card {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: var(--spacing-lg);
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: var(--spacing-xl);
}

/* Large numeral in emerald for the step indicator */
.step-number {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-green);
  line-height: 1;
}

/* Step title — slightly smaller than page h2 */
.step-title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-xs);
}

/* Bullet list within steps — muted & compact */
.step-list {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* --------------------------------------------------------------------------
   19. Site Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding-top: var(--spacing-xxl);
  padding-bottom: var(--spacing-xl);
  margin-top: var(--spacing-xxl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-xl);
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.95rem;
  max-width: 320px;
  margin-top: var(--spacing-sm);
}

.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: var(--spacing-md);
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-col li {
  margin-bottom: var(--spacing-sm);
}

.footer-col a {
  color: var(--text-main);
  font-size: 0.9rem;
}

.footer-col a:hover {
  color: var(--accent-green);
}

.footer-bottom {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

/* --------------------------------------------------------------------------
   20. Responsive Breakpoints
   -------------------------------------------------------------------------- */
@media (max-width: 960px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }

  .about-panel {
    grid-template-columns: 1fr;
  }

  .about-photo {
    max-width: 280px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
  }
}

@media (max-width: 768px) {
  /* Hide desktop nav, show hamburger */
  .desktop-nav,
  .header-actions .cta-button {
    display: none;
  }

  .menu-toggle {
    display: inline-flex;
  }

  h1 { font-size: 2.1rem; }
  h2 { font-size: 1.6rem; }

  .hero-title {
    font-size: 2.35rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  .step-card {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
  }

  .step-number {
    font-size: 1.5rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .button-group {
    flex-direction: column;
    align-items: flex-start;
  }
}