/* ==========================================================================
   Personal Website — Shared Styles
   Dark theme, minimal, mobile-first
   ========================================================================== */

:root {
  --color-bg: #0d0f12;
  --color-bg-elevated: #15181e;
  --color-bg-card: #1a1e26;
  --color-border: #2a303c;
  --color-text: #e8eaed;
  --color-text-muted: #9aa0ad;
  --color-accent: #6b9fff;
  --color-accent-hover: #8ab4ff;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace;
  --max-width: 72rem;
  --header-height: 4rem;
  --radius: 0.5rem;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-sm);
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-accent);
  color: var(--color-bg);
  border-radius: var(--radius);
  z-index: 200;
}

.skip-link:focus {
  top: var(--space-sm);
}

/* ==========================================================================
   Layout
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

main {
  flex: 1;
  padding: var(--space-lg) 0 var(--space-xl);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 15, 18, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
}

.logo {
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

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

/* Mobile menu toggle */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg-elevated);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 1.25rem;
  height: 2px;
  margin: 0 auto;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

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

.site-nav a.active {
  font-weight: 500;
}

/* Mobile nav (default) */
.site-nav {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease;
}

.site-nav.is-open {
  max-height: 20rem;
}

.site-nav ul {
  padding: var(--space-sm) var(--space-md) var(--space-md);
}

.site-nav li + li {
  margin-top: var(--space-xs);
}

/* Desktop nav */
@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    max-height: none;
    overflow: visible;
    background: transparent;
    border: none;
  }

  .site-nav ul {
    display: flex;
    gap: var(--space-md);
    padding: 0;
  }

  .site-nav li + li {
    margin-top: 0;
  }
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  margin-top: auto;
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
}

.site-footer .container {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  text-align: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm) var(--space-md);
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

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

.copyright {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* ==========================================================================
   Typography & Sections
   ========================================================================== */

.page-title {
  margin: 0 0 var(--space-sm);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.lead {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 40rem;
  margin: 0 0 var(--space-lg);
}

.section {
  margin-bottom: var(--space-xl);
}

.section-title {
  margin: 0 0 var(--space-md);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
}

/* Hero (home) */
.hero {
  padding: var(--space-md) 0 var(--space-lg);
}

.hero h1 {
  margin: 0 0 var(--space-sm);
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.hero-label {
  margin: 0 0 var(--space-xs);
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hero .tagline {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 40rem;
  margin: 0 0 var(--space-md);
}

.focus-block {
  margin-bottom: var(--space-lg);
}

.focus-heading {
  margin: 0 0 var(--space-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.focus-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  list-style: none;
  margin: 0;
  padding: 0;
}

.focus-list li {
  padding: 0.35rem 0.75rem;
  font-size: 0.875rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
}

.section-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.section-header .section-title {
  margin: 0;
}

.section-link {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

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

.btn {
  display: inline-block;
  padding: 0.625rem 1.25rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-bg);
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.15s ease;
}

.btn:hover {
  background: var(--color-accent-hover);
  color: var(--color-bg);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-border);
}

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

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

/* Cards (projects, blog) */
.card-grid {
  display: grid;
  gap: var(--space-md);
}

@media (min-width: 600px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .card-grid--projects {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  padding: var(--space-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color 0.15s ease;
}

.card:hover {
  border-color: #3d4556;
}

.card h3 {
  margin: 0 0 var(--space-xs);
  font-size: 1.0625rem;
}

.card p {
  margin: 0 0 var(--space-sm);
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.card-meta {
  margin: 0 0 var(--space-sm);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

/* Project cards — duplicate .project-card in projects.html */
.project-card {
  display: flex;
  flex-direction: column;
}

.card-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-md);
  margin-top: auto;
  padding-top: var(--space-xs);
}

.card-links a {
  font-size: 0.9375rem;
  font-weight: 500;
}

.card-link--demo {
  color: var(--color-text-muted);
}

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

/* About */
.about-content p {
  margin: 0 0 var(--space-md);
  max-width: 42rem;
}

.skill-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  list-style: none;
  margin: 0;
  padding: 0;
}

.skill-list li {
  padding: 0.35rem 0.75rem;
  font-size: 0.875rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text-muted);
}

/* Contact */
.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.contact-list li {
  margin-bottom: var(--space-sm);
}

.contact-list a {
  font-size: 1.0625rem;
}

/* Blog post list */
.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.post-list li {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
}

.post-list li:first-child {
  padding-top: 0;
}

.post-list-title {
  margin: 0 0 var(--space-xs);
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.3;
}

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

.post-list-title a:hover {
  color: var(--color-accent);
}

.post-list-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xs);
}

.post-list .date {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

.post-excerpt {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  max-width: 42rem;
}

/* Tags (blog index + posts) */
.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  list-style: none;
  margin: 0;
  padding: 0;
}

.post-tags li {
  padding: 0.25rem 0.6rem;
  font-size: 0.75rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text-muted);
}

.post-tags--compact li {
  font-size: 0.6875rem;
}

/* Single post layout */
.post {
  max-width: 42rem;
}

.post-header {
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.post-back {
  display: inline-block;
  margin-bottom: var(--space-md);
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.post-back:hover {
  color: var(--color-accent);
}

.post-date {
  display: block;
  margin: 0 0 var(--space-sm);
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  color: var(--color-text-muted);
}

.post-title {
  margin: 0 0 var(--space-sm);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.post-body {
  margin-bottom: var(--space-lg);
}

.post-footer {
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
}

.post-body p {
  margin: 0 0 var(--space-md);
}

/* Prose (blog posts, about) */
.prose h2 {
  margin: var(--space-lg) 0 var(--space-sm);
  font-size: 1.25rem;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 0.15em 0.4em;
  background: var(--color-bg-card);
  border-radius: 0.25rem;
}

/* Resume */
.resume-header {
  margin-bottom: var(--space-lg);
}

.resume-contact {
  margin: 0 0 var(--space-md);
}

.resume-download {
  margin: 0;
}

.resume-body {
  max-width: 48rem;
}

.resume-section {
  margin-bottom: var(--space-lg);
}

.resume-section h2 {
  margin: 0 0 var(--space-sm);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.resume-role {
  margin-bottom: var(--space-md);
}

.resume-role h3 {
  margin: 0 0 var(--space-xs);
  font-size: 1.0625rem;
  font-weight: 600;
}

.resume-dates {
  margin: 0 0 var(--space-xs);
  font-size: 0.875rem;
  font-family: var(--font-mono);
  color: var(--color-text-muted);
}

.resume-body ul {
  margin: 0;
  padding-left: 1.25rem;
}

.resume-body li {
  margin-bottom: 0.35rem;
}