/* ============================================================
   CSS Custom Properties
   ============================================================ */
:root {
  --bg: #f5f4f1;
  --bg-card: #e8e5df;
  --text: #2a2a2a;
  --text-muted: #666666;
  --accent: #4a7ec0;
  --accent-hover: #3a6eb0;
  --border: #d4d2cc;
  --radius: 6px;
  --content-width: min(700px, 90vw);
  --font: "Libre Franklin", system-ui, sans-serif;
}

[data-theme="dark"] {
  --bg: #1e1e28;
  --bg-card: #2a2a36;
  --text: #e2e2e8;
  --text-muted: #8888a0;
  --accent: #6b9fd4;
  --accent-hover: #8ab8e4;
  --border: #38384a;
}

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.9375rem;
  line-height: 1.7;
  transition:
    background-color 0.2s,
    color 0.2s;
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

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

/* ============================================================
   Header & Navigation
   ============================================================ */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg);
  transition: background-color 0.2s;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: 56px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  flex-shrink: 0;
}
.nav-brand:hover {
  color: var(--text);
  text-decoration: none;
}

.nav-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--bg-card);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 20px;
  align-items: center;
}
.nav-links a {
  color: var(--accent);
  font-size: 0.875rem;
  text-decoration: none;
}
.nav-links a:hover,
.nav-links a.active {
  text-decoration: underline;
}

/* Theme toggle */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 4px;
  display: flex;
  align-items: center;
  border-radius: 4px;
  transition: color 0.2s;
  flex-shrink: 0;
}
.theme-toggle:hover {
  color: var(--text);
}
.theme-toggle svg {
  width: 18px;
  height: 18px;
}

.icon-sun {
  display: none;
}
.icon-moon {
  display: block;
}
[data-theme="dark"] .icon-sun {
  display: block;
}
[data-theme="dark"] .icon-moon {
  display: none;
}

/* Hamburger button */
.nav-hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text);
  padding: 4px;
  flex-direction: column;
  gap: 5px;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
}
.nav-hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition:
    transform 0.2s,
    opacity 0.2s;
}
.nav-hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-hamburger.open span:nth-child(2) {
  opacity: 0;
}
.nav-hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile dropdown */
.nav-mobile {
  display: none;
  background-color: var(--bg);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 8px 0 12px;
  transition: background-color 0.2s;
}
.nav-mobile.open {
  display: block;
}
.nav-mobile a {
  display: block;
  padding: 10px 24px;
  color: var(--accent);
  font-size: 0.9375rem;
  text-decoration: none;
}
.nav-mobile a:hover {
  background: var(--bg-card);
  text-decoration: none;
}
.nav-mobile a.active {
  text-decoration: underline;
}
.nav-mobile-footer {
  display: flex;
  align-items: center;
  padding: 10px 24px 0;
  gap: 10px;
  border-top: 1px solid var(--border);
  margin-top: 8px;
}
.nav-mobile-footer span {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ============================================================
   Page Content
   ============================================================ */
.page {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.page-title {
  font-size: 1.625rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 28px;
}

.page hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 24px 0;
}

/* ============================================================
   Home Page
   ============================================================ */
.home {
  text-align: center;
  padding-top: 32px;
}

.home-avatar {
  width: 200px;
  height: 200px;
  border-radius: 10%;
  object-fit: cover;
  margin: 0 auto 20px;
  background: var(--bg-card);
}

.home-name {
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.home-social {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 40px;
}
.home-social a {
  color: var(--text);
  display: flex;
  align-items: center;
  text-decoration: none;
  transition: color 0.15s;
}
.home-social a:hover {
  color: var(--accent);
  text-decoration: none;
}
.home-social svg {
  width: 22px;
  height: 22px;
}

.home-bio {
  text-align: left;
  max-width: 480px;
  margin: 0 auto;
}
.home-bio p + p {
  margin-top: 14px;
}

/* ============================================================
   About Page
   ============================================================ */
.about-meta {
  margin-bottom: 36px;
}
.about-meta p {
  margin-bottom: 4px;
}
.about-meta .updated {
  font-style: italic;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.about-section {
  margin-bottom: 40px;
}
.about-section h2 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.about-section p + p {
  margin-top: 12px;
}
.about-section ul {
  list-style: disc;
  padding-left: 18px;
}
.about-section ul li {
  margin-bottom: 5px;
}

/* ============================================================
   Writing Page
   ============================================================ */
.writing-intro {
  margin-bottom: 36px;
}
.writing-intro p {
  margin-bottom: 6px;
}
.writing-note {
  font-size: 0.875rem;
}

.writing-topic {
  margin-bottom: 32px;
}
.writing-topic h2 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 10px;
}
.writing-topic ul {
  list-style: none;
  padding: 0;
}
.writing-topic ul li {
  margin-bottom: 8px;
}

.ext-link::after {
  content: " ↗";
  font-size: 0.85em;
  vertical-align: 0.05em;
}

/* ============================================================
   Now Page
   ============================================================ */
.now-intro {
  margin-bottom: 32px;
}
.now-intro p {
  margin-bottom: 4px;
}
.now-updated {
  font-style: italic;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.now-section {
  margin-bottom: 36px;
}
.now-section h2 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 10px;
}
.now-section p + p {
  margin-top: 10px;
}

/* ============================================================
   Projects Page
   ============================================================ */
.projects-intro {
  font-size: 0.875rem;
  margin-bottom: 28px;
}

.projects-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  margin-bottom: 28px;
}

.projects-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.filter-btn {
  padding: 4px 14px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: none;
  color: var(--text-muted);
  font-size: 0.8125rem;
  cursor: pointer;
  font-family: var(--font);
  transition: all 0.15s;
  line-height: 1.5;
}
.filter-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-rows: minmax(240px, auto);
  grid-auto-flow: row dense;
  gap: 20px;
}

.project-card {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  text-decoration: none;
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition:
    transform 0.3s cubic-bezier(0.2, 0.7, 0.3, 1),
    box-shadow 0.3s ease,
    border-color 0.3s ease;
}

.project-card.tall {
  grid-row: span 2;
}

/* accent bar that wipes across the top on hover */
.project-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s cubic-bezier(0.2, 0.7, 0.3, 1);
  z-index: 3;
}

.project-card:hover,
.project-card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.12);
  text-decoration: none;
}

.project-card:hover::after,
.project-card:focus-visible::after {
  transform: scaleX(1);
}

[data-theme="dark"] .project-card:hover,
[data-theme="dark"] .project-card:focus-visible {
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.45);
}

/* image band, fills whatever space the text panel leaves */
.project-card-bg {
  flex: 1 1 auto;
  min-height: 130px;
  transition: transform 0.45s ease;
}

.project-card:hover .project-card-bg,
.project-card:focus-visible .project-card-bg {
  transform: scale(1.05);
}

/* text panel, always visible, paints over the zooming image */
.project-card-overlay {
  position: relative;
  z-index: 2;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 14px 16px 16px;
}

.project-card-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.35;
  transition: color 0.25s ease;
}

.project-card:hover .project-card-title,
.project-card:focus-visible .project-card-title {
  color: var(--accent);
}

.project-card-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.project-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.project-tag {
  font-size: 0.75rem;
  line-height: 1.6;
  padding: 1px 8px;
  border-radius: 10px;
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

@media (prefers-reduced-motion: reduce) {
  .project-card,
  .project-card-bg,
  .project-card::after {
    transition: none;
  }
  .project-card:hover,
  .project-card:focus-visible,
  .project-card:hover .project-card-bg,
  .project-card:focus-visible .project-card-bg {
    transform: none;
  }
}

.projects-empty {
  grid-column: 1 / -1;
  font-size: 0.9375rem;
  padding: 20px 0;
}

/* ============================================================
   Hire Me Page
   ============================================================ */
.hire-draft-notice {
  border-left: 3px solid var(--accent);
  background: var(--bg-card);
  padding: 12px 16px;
  margin-bottom: 40px;
  border-radius: 0 4px 4px 0;
  font-size: 0.875rem;
}

.hire-section {
  margin-bottom: 40px;
}
.hire-section h2 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 14px;
}
.hire-section p + p {
  margin-top: 12px;
}
.hire-section ul {
  list-style: disc;
  padding-left: 18px;
}
.hire-section ul li {
  margin-bottom: 6px;
}
.hire-section h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-top: 18px;
  margin-bottom: 8px;
}

.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}
.tech-tag {
  padding: 4px 12px;
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* ============================================================
   Post Page
   ============================================================ */
.post-intro {
  margin-bottom: 8px;
}
.post-intro p + p {
  margin-top: 12px;
}

.post-section {
  margin-bottom: 32px;
}
.post-section h2 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.post-section p + p {
  margin-top: 12px;
}
.post-section ul,
.post-section ol {
  list-style: disc;
  padding-left: 18px;
  margin-top: 12px;
}
.post-section ol {
  list-style: decimal;
}
.post-section ul li,
.post-section ol li {
  margin-bottom: 5px;
}
.post-section p + ul,
.post-section p + ol {
  margin-top: 8px;
}
.post-footnote {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-style: italic;
}

.post-back {
  display: inline-block;
  margin-bottom: 20px;
  font-size: 0.875rem;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 900px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .nav-links,
  .nav-right .theme-toggle {
    display: none;
  }
  .nav-hamburger {
    display: flex;
  }

  .page {
    padding: 32px 16px 60px;
  }

  .home {
    padding-top: 20px;
  }

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

  .project-card.tall {
    grid-row: span 1;
  }
}