/* ==========================================
   SHAWNLJJ — Portfolio & Blog
   Art direction: Warm creative-tech. Builder aesthetic.
   Font: Erode (display) + Satoshi (body) — editorial warmth meets modern clarity
   ========================================== */

/* --- Design Tokens --- */
:root {
  /* Type scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(3rem, 0.5rem + 7vw, 8rem);

  /* Spacing (4px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in: cubic-bezier(0.4, 0, 1, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;

  /* Fonts */
  --font-display: 'Erode', 'Georgia', serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;
}

/* --- Light Mode (default) --- */
:root,
[data-theme='light'] {
  --color-bg: #FAFAF7;
  --color-surface: #F5F4F0;
  --color-surface-2: #EEEDEA;
  --color-border: #D8D5CE;
  --color-divider: #E3E0DA;

  --color-text: #1A1915;
  --color-text-muted: #6B6A65;
  --color-text-faint: #A9A8A3;

  --color-primary: #C45D2C;
  --color-primary-hover: #A84E24;
  --color-primary-subtle: #FBF0EA;

  --color-tag-bg: #EDE8E0;
  --color-tag-text: #5C5A53;

  --shadow-sm: 0 1px 2px oklch(0.2 0.01 60 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.2 0.01 60 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.2 0.01 60 / 0.12);
}

/* --- Dark Mode --- */
[data-theme='dark'] {
  --color-bg: #141310;
  --color-surface: #1C1B18;
  --color-surface-2: #242320;
  --color-border: #3A3935;
  --color-divider: #2E2D2A;

  --color-text: #E0DFDB;
  --color-text-muted: #8A8985;
  --color-text-faint: #5A5955;

  --color-primary: #E8885A;
  --color-primary-hover: #D47040;
  --color-primary-subtle: #2A2018;

  --color-tag-bg: #2A2926;
  --color-tag-text: #B0AFA9;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.3);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.4);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #141310;
    --color-surface: #1C1B18;
    --color-surface-2: #242320;
    --color-border: #3A3935;
    --color-divider: #2E2D2A;
    --color-text: #E0DFDB;
    --color-text-muted: #8A8985;
    --color-text-faint: #5A5955;
    --color-primary: #E8885A;
    --color-primary-hover: #D47040;
    --color-primary-subtle: #2A2018;
    --color-tag-bg: #2A2926;
    --color-tag-text: #B0AFA9;
    --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
    --shadow-md: 0 4px 12px oklch(0 0 0 / 0.3);
    --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.4);
  }
}

/* --- Global Styles --- */
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-interactive);
}
a:hover { color: var(--color-primary-hover); }

/* --- Header / Nav --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(from var(--color-bg) l c h / 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
  transition: box-shadow 0.3s var(--ease-out);
}
.site-header--scrolled {
  box-shadow: var(--shadow-sm);
}
.header-inner {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding: var(--space-4) var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
}
.logo svg { width: 28px; height: 28px; }
.logo-text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: -0.02em;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
}
.nav-links a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-interactive);
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--color-text);
}
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  transition: color var(--transition-interactive), background var(--transition-interactive);
}
.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface);
}

/* Mobile nav */
.mobile-menu-btn {
  display: none;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
}
@media (max-width: 640px) {
  .mobile-menu-btn { display: flex; }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-divider);
    padding: var(--space-4);
    gap: var(--space-4);
  }
}

/* --- Container --- */
.container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
}
.container--narrow {
  max-width: var(--content-narrow);
}
.container--default {
  max-width: var(--content-default);
}

/* --- Hero --- */
.hero {
  padding: clamp(var(--space-16), 10vw, var(--space-32)) var(--space-4);
  text-align: center;
  max-width: var(--content-default);
  margin-inline: auto;
}
.hero-title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 500;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-4);
  color: var(--color-text);
}
.hero-title em {
  font-style: italic;
  color: var(--color-primary);
}
.hero-sub {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 52ch;
  margin-inline: auto;
  line-height: 1.7;
}

/* --- Section --- */
.section {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
  padding-inline: var(--space-4);
}
.section-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 500;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-8);
  color: var(--color-text);
}
.section-label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

/* --- Project Cards --- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(340px, 100%), 1fr));
  gap: var(--space-6);
  max-width: var(--content-wide);
  margin-inline: auto;
}
.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  text-decoration: none;
  color: var(--color-text);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive), border-color var(--transition-interactive);
}
.project-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
  color: var(--color-text);
}
.project-card:active {
  transform: translateY(0);
}
.project-card-img {
  aspect-ratio: 16/10;
  background: var(--color-surface-2);
  overflow: hidden;
  position: relative;
}
.project-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s var(--ease-out);
}
.project-card:hover .project-card-img img {
  transform: scale(1.04);
}
.project-card-body {
  padding: var(--space-5);
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.project-card-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  letter-spacing: -0.01em;
}
.project-card-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  flex: 1;
}
.project-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-2);
}
.tag {
  font-size: var(--text-xs);
  padding: var(--space-1) var(--space-3);
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  border-radius: var(--radius-full);
  font-weight: 500;
}

/* --- Blog Cards --- */
.blog-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  max-width: var(--content-default);
  margin-inline: auto;
}
.blog-card {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text);
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}
.blog-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
  color: var(--color-text);
}
@media (min-width: 640px) {
  .blog-card {
    grid-template-columns: 200px 1fr;
    gap: var(--space-6);
  }
}
.blog-card-img {
  aspect-ratio: 16/10;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-surface-2);
}
.blog-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.blog-card-body {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  justify-content: center;
}
.blog-card-meta {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.blog-card-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  letter-spacing: -0.01em;
}
.blog-card-excerpt {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* --- Article/Case Study --- */
.article-header {
  padding: clamp(var(--space-12), 8vw, var(--space-24)) var(--space-4) var(--space-8);
  text-align: center;
  max-width: var(--content-default);
  margin-inline: auto;
}
.article-header .section-label { margin-bottom: var(--space-3); }
.article-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 500;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-4);
}
.article-meta {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  display: flex;
  justify-content: center;
  gap: var(--space-4);
}
.article-hero-img {
  max-width: var(--content-wide);
  margin: 0 auto var(--space-12);
  padding-inline: var(--space-4);
}
.article-hero-img img {
  width: 100%;
  border-radius: var(--radius-xl);
  aspect-ratio: 21/9;
  object-fit: cover;
}

/* Article body (prose) */
.article-body {
  max-width: var(--content-narrow);
  margin-inline: auto;
  padding-inline: var(--space-4);
  padding-bottom: clamp(var(--space-12), 6vw, var(--space-24));
}
.article-body h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 500;
  margin-top: var(--space-12);
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}
.article-body h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
}
.article-body p {
  margin-bottom: var(--space-5);
  line-height: 1.7;
}
.article-body ul,
.article-body ol {
  margin-bottom: var(--space-5);
  padding-left: var(--space-6);
}
.article-body li {
  margin-bottom: var(--space-2);
  line-height: 1.7;
}
.article-body blockquote {
  border-left: 3px solid var(--color-primary);
  padding-left: var(--space-5);
  margin: var(--space-8) 0;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-style: italic;
  color: var(--color-text-muted);
  line-height: 1.5;
}
.article-body img {
  width: 100%;
  border-radius: var(--radius-lg);
  margin: var(--space-8) 0;
}
.article-body code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9em;
  background: var(--color-surface);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
}
.article-body pre {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  overflow-x: auto;
  margin: var(--space-6) 0;
}
.article-body pre code {
  background: none;
  padding: 0;
}

/* Key metrics callout */
.metrics-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-4);
  margin: var(--space-8) 0;
  padding: var(--space-6);
  background: var(--color-primary-subtle);
  border-radius: var(--radius-xl);
}
.metric {
  text-align: center;
}
.metric-value {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-primary);
}
.metric-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

/* Status badges */
.tbc-badge {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  background: var(--color-primary-subtle);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
}

/* Next Steps tracker */
.next-steps {
  margin-top: var(--space-10);
  padding: var(--space-6) var(--space-8);
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
}
.next-steps h2 {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}
.next-steps-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.next-steps-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--text-sm);
  line-height: 1.5;
}
.step-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-top: 1px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
}
.step-icon--pending {
  border: 2px solid var(--color-divider);
  background: transparent;
}
.step-icon--active {
  border: 2px solid var(--color-primary);
  background: var(--color-primary-subtle);
  color: var(--color-primary);
}
.step-icon--done {
  border: none;
  background: var(--color-primary);
  color: #fff;
}
.step-label--done {
  text-decoration: line-through;
  color: var(--color-text-muted);
}
.next-steps-updated {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-divider);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

/* --- About Page --- */
.about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  max-width: var(--content-default);
  margin-inline: auto;
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
}
@media (min-width: 768px) {
  .about-layout {
    grid-template-columns: 280px 1fr;
    gap: var(--space-12);
  }
}
.about-photo {
  width: 200px;
  height: 200px;
  border-radius: var(--radius-xl);
  object-fit: cover;
  background: var(--color-surface);
}
@media (min-width: 768px) {
  .about-photo {
    width: 100%;
    height: auto;
    aspect-ratio: 1;
    position: sticky;
    top: calc(var(--space-16) + var(--space-8));
  }
}

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--color-divider);
  padding: var(--space-8) var(--space-4);
  text-align: center;
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.footer-inner {
  max-width: var(--content-wide);
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}
.footer-links {
  display: flex;
  gap: var(--space-6);
  list-style: none;
}
.footer-links a {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}
.footer-links a:hover {
  color: var(--color-text);
}

/* --- Scroll Reveal --- */
.fade-in { opacity: 1; }
@supports (animation-timeline: scroll()) {
  .fade-in {
    opacity: 0;
    animation: reveal-fade linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 100%;
  }
}
@keyframes reveal-fade { to { opacity: 1; } }

/* --- CTA Row --- */
.cta-row {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  margin-top: var(--space-6);
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: background var(--transition-interactive), color var(--transition-interactive), box-shadow var(--transition-interactive), transform var(--transition-interactive);
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-primary:active { transform: translateY(0); box-shadow: none; }
.btn-ghost {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn-ghost:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
  transform: translateY(-1px);
}
.btn-ghost:active { transform: translateY(0); }

/* --- Page title (for index pages) --- */
.page-intro {
  text-align: center;
  padding: clamp(var(--space-12), 8vw, var(--space-20)) var(--space-4) var(--space-8);
  max-width: var(--content-default);
  margin-inline: auto;
}
.page-intro h1 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 500;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-3);
}
.page-intro p {
  color: var(--color-text-muted);
  font-size: var(--text-base);
  max-width: 48ch;
  margin-inline: auto;
}

/* --- Empty state (for future posts) --- */
.empty-state {
  text-align: center;
  padding: var(--space-16) var(--space-4);
  color: var(--color-text-faint);
}
.empty-state-icon {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-4);
}

/* --- View All link --- */
.view-all {
  display: flex;
  justify-content: center;
  margin-top: var(--space-8);
}
.view-all a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}
.view-all a:hover {
  gap: var(--space-3);
}