/* General Styles - Dark Theme */
:root {
  --primary-color: #60a5fa;
  --secondary-color: #1e293b;
  --accent-color: #f87171;
  --light-bg: #1a1a2e;
  --dark-bg: #0f0f1a;
  --surface: #252538;
  --text-light: #f1f5f9;
  --text-dark: #e2e8f0;
  --text-muted: #94a3b8;
  --border-radius: 5px;
  --transition: all 0.3s ease;
  --page-edge: rgba(148, 163, 184, 0.14);
  --page-hero-tint: linear-gradient(
    165deg,
    rgba(96, 165, 250, 0.07) 0%,
    rgba(26, 26, 46, 0) 55%
  );
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--light-bg);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.container--wide {
  max-width: min(100%, 1320px);
  padding-left: clamp(16px, 4vw, 28px);
  padding-right: clamp(16px, 4vw, 28px);
}

a {
  text-decoration: none;
  color: var(--primary-color);
  transition: var(--transition);
}

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

h1, h2, h3 {
  margin-bottom: 15px;
  line-height: 1.2;
}

section {
  padding: 80px 0;
}

.btn {
  display: inline-block;
  background-color: var(--primary-color);
  color: white;
  padding: 12px 25px;
  border-radius: var(--border-radius);
  font-weight: 600;
  transition: var(--transition);
}

.btn:hover {
  background-color: var(--accent-color);
  color: white;
  transform: translateY(-3px);
  box-shadow: 0 5px 20px rgba(248, 113, 113, 0.3);
}

/* Site navigation only — do not use bare `header` or inner <header class="page-hero"> inherits sticky */
body > header {
  background-color: var(--dark-bg);
  color: var(--text-light);
  padding: 20px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.4);
}

body > header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

body > header h1 {
  font-size: 1.8rem;
  margin-bottom: 0;
}

body > header h1 a {
  color: inherit;
  text-decoration: none;
}

body > header h1 a:hover {
  color: var(--text-light);
}

.tagline {
  font-style: italic;
  opacity: 0.8;
  margin-right: auto;
  margin-left: 15px;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 20px;
}

nav a {
  color: var(--text-light);
  font-weight: 500;
  padding: 5px 10px;
  border-radius: var(--border-radius);
}

nav a:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

nav a[aria-current="page"] {
  color: var(--primary-color);
  font-weight: 600;
}

/* Hero Section */
#hero {
  background-color: var(--dark-bg);
  color: var(--text-light);
  padding: 80px 0 100px;
  text-align: left;
}

.hero-layout {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 40px 48px;
  justify-content: center;
}

.hero-portrait {
  flex-shrink: 0;
  margin: 0 auto;
}

.hero-portrait img {
  display: block;
  width: min(280px, 72vw);
  aspect-ratio: 4 / 5;
  height: auto;
  object-fit: cover;
  object-position: center top;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
}

.hero-copy {
  flex: 1;
  min-width: min(100%, 320px);
  max-width: 640px;
}

#hero h2.hero-lead {
  font-size: clamp(1.2rem, 2.8vw, 1.5rem);
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 1.25rem;
  line-height: 1.45;
  animation: fadeIn 1s ease;
}

#hero .hero-copy p {
  font-size: 1.05rem;
  margin: 0 0 1rem;
  opacity: 0.92;
  line-height: 1.65;
  animation: fadeIn 1.5s ease;
}

.hero-tools {
  font-size: 0.98rem !important;
  color: var(--text-muted);
  margin-bottom: 1.5rem !important;
}

#hero .btn {
  margin-top: 0.25rem;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* About Section */
#about {
  background-color: var(--light-bg);
}

.about-content {
  display: flex;
  gap: 40px;
  align-items: center;
  flex-wrap: wrap;
}

.about-text {
  flex: 1;
  min-width: 300px;
}

.about-text p {
  margin-bottom: 20px;
}

.skills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.skill-tag {
  background-color: var(--surface);
  color: var(--text-light);
  padding: 5px 15px;
  border-radius: 20px;
  font-size: 0.9rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

/* Projects Section */
#projects {
  background-color: var(--secondary-color);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.project-card {
  border-radius: var(--border-radius);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  overflow: hidden;
  transition: var(--transition);
  background-color: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
  border-color: rgba(96, 165, 250, 0.2);
}

.project-content {
  padding: 20px;
}

.project-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.project-language {
  display: flex;
  align-items: center;
  font-size: 0.9rem;
  gap: 5px;
  color: var(--text-muted);
  margin-bottom: 15px;
}

.language-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.project-status {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.project-links {
  margin-top: 15px;
  display: flex;
  gap: 15px;
}

.project-links a {
  font-size: 0.9rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 5px;
}

.projects-loading {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--text-muted);
  padding: 2rem;
}

/* Contact Section */
#contact {
  background-color: var(--light-bg);
  text-align: center;
}

.contact-content {
  max-width: 600px;
  margin: 0 auto;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin-top: 30px;
  flex-wrap: wrap;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 500;
  padding: 10px 20px;
  border-radius: var(--border-radius);
  background-color: var(--surface);
  color: var(--text-light);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
  transition: var(--transition);
}

.contact-link:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
  border-color: rgba(96, 165, 250, 0.3);
}

/* Footer */
footer {
  background-color: var(--dark-bg);
  color: var(--text-light);
  padding: 30px 0;
  text-align: center;
}

/* Scroll animation */
.animate-in {
  opacity: 1;
  transform: translateY(0);
}

.animate-out {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

/* Responsive Design */
@media (max-width: 768px) {
  body > header .container {
    flex-direction: column;
    text-align: center;
  }

  nav ul {
    margin-top: 15px;
  }

  .tagline {
    margin: 5px 0 10px;
  }

  #hero {
    text-align: center;
    padding: 60px 0 80px;
  }

  .hero-copy {
    margin: 0 auto;
  }

  .hero-copy .btn {
    display: inline-block;
  }

  #hero h2.hero-lead {
    font-size: 1.15rem;
  }

  .contact-links {
    flex-direction: column;
    gap: 15px;
  }
}

/* Inner pages (blog, projects, project detail) */
.page-main {
  padding: 2.5rem 0 5rem;
  min-height: 50vh;
  background-color: var(--light-bg);
  border-top: 1px solid var(--page-edge);
}

.container--narrow {
  max-width: 720px;
}

.page-hero {
  position: relative;
  z-index: 0;
  margin-bottom: 2.25rem;
  padding: 1.75rem 1.5rem 1.75rem;
  border-radius: 12px;
  border: 1px solid var(--page-edge);
  background: var(--page-hero-tint);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.04) inset;
}

.page-hero--compact {
  padding: 1.35rem 1.25rem;
  margin-bottom: 2rem;
}

.page-hero .page-title {
  color: var(--text-light);
  font-size: clamp(1.5rem, 4vw, 1.85rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.65rem;
}

.page-hero-lead {
  margin: 0;
  color: var(--text-muted);
  max-width: 40rem;
  line-height: 1.65;
  font-size: 1.05rem;
}

.breadcrumb {
  font-size: 0.9rem;
  margin-bottom: 1.25rem;
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--primary-color);
  font-weight: 500;
}

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

.breadcrumb-sep {
  margin: 0 0.5rem;
  opacity: 0.45;
}

.breadcrumb-current {
  color: var(--text-dark);
}

/* Project index: large image cards */
.project-card-bar {
  margin-top: 0.75rem;
}

.project-card-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: clamp(1.25rem, 3vw, 2rem);
}

.project-card-link {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  align-items: stretch;
  min-height: clamp(220px, 32vw, 360px);
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background-color: var(--surface);
  color: var(--text-light);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}

.project-card-link:hover {
  border-color: rgba(96, 165, 250, 0.45);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.45);
  transform: translateY(-3px);
  color: var(--text-light);
}

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

.project-card-link-media {
  position: relative;
  min-height: 200px;
  background: linear-gradient(145deg, #1e293b 0%, #0f172a 100%);
  overflow: hidden;
}

.project-card-link-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
  transition: transform 0.45s ease;
}

.project-card-link:hover .project-card-link-media img {
  transform: scale(1.04);
}

.project-card-link-body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.5rem;
  padding: clamp(1.25rem, 3vw, 2.25rem) clamp(1.25rem, 4vw, 3rem);
  min-width: 0;
}

.project-card-link-title {
  margin: 0;
  font-size: clamp(1.35rem, 2.5vw, 1.85rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-light);
  line-height: 1.2;
}

.project-card-link-meta {
  margin: 0;
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.5;
  max-width: 36ch;
}

.project-card-link-cta {
  margin-top: 0.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--primary-color);
  transition: color 0.2s ease;
}

@media (max-width: 900px) {
  .project-card-link {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .project-card-link-media {
    aspect-ratio: 16 / 10;
    min-height: 0;
    max-height: 55vh;
  }

  .project-card-link-body {
    padding: 1.35rem 1.25rem 1.5rem;
  }
}

/* Project detail article */
.project-detail {
  padding-bottom: 2rem;
}

.project-detail-section {
  margin-bottom: 2rem;
}

.project-detail-section h3 {
  color: var(--text-light);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--page-edge);
}

.project-detail-section p {
  color: var(--text-dark);
  margin-bottom: 1rem;
  line-height: 1.7;
}

.project-detail-list {
  margin-left: 1.25rem;
  color: var(--text-dark);
  line-height: 1.75;
}

.project-detail-list li {
  margin-bottom: 0.35rem;
}

.project-writeup p {
  margin-bottom: 1.1rem;
}

.project-writeup-figure {
  margin: 1.75rem 0 2rem;
}

.project-writeup-figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 10px;
  border: 1px solid var(--page-edge);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.35);
}

.project-writeup-figure video {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 10px;
  border: 1px solid var(--page-edge);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.35);
  background: #000;
}

.project-writeup-figure figcaption {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 0.65rem;
  line-height: 1.55;
  text-align: center;
}

.project-writeup-two-up {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(0.75rem, 2.5vw, 1.25rem);
  align-items: start;
  margin: 1.75rem 0 2rem;
}

.project-writeup-two-up .project-writeup-figure--pair {
  margin: 0;
}

.project-writeup-two-up .project-writeup-figure--pair figcaption {
  font-size: 0.85rem;
  text-align: center;
}

@media (max-width: 640px) {
  .project-writeup-two-up {
    grid-template-columns: 1fr;
  }
}

.project-inline-link {
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.project-link-note {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Avoid double vertical padding: global `section` rule + .page-main */
.page-main section#projects {
  padding: 0;
}