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

:root {
  --bg: #f4f6fb;
  --surface: #ffffff;
  --ink: #1f2533;
  --muted: #5b6474;
  --accent: #4f6df5;
  --accent-dark: #3a54cc;
  --border: #e3e7f0;
  --radius: 12px;
  --shadow: 0 2px 8px rgba(31, 37, 51, 0.08);
  --shadow-lift: 0 12px 28px rgba(31, 37, 51, 0.18);
}

body {
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
}

main.page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

h1.page-title {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

p.page-subtitle {
  color: var(--muted);
  margin-bottom: 2rem;
  max-width: 60ch;
}

.btn {
  display: inline-block;
  padding: 0.55rem 1.2rem;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s ease;
}

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

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.navbar {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.9rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
}

.logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), #9b6df5);
  color: #fff;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 500;
  padding: 0.35rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

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

.nav-links a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.task-index {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.task-index a {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem;
  text-decoration: none;
  color: var(--ink);
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.task-index a:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lift);
}

.task-index .tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: 0.4rem;
}

.task-index h2 {
  font-size: 1.15rem;
  margin-bottom: 0.35rem;
}

.task-index p {
  color: var(--muted);
  font-size: 0.92rem;
}

.card-row {
  display: flex;
  gap: 1.5rem;
  align-items: stretch;
  flex-wrap: wrap;
}

.card {
  flex: 1 1 260px;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lift);
}

.card img {
  width: 100%;
  height: 170px;
  object-fit: cover;
  display: block;
}

.card-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 1.25rem;
  gap: 0.6rem;
}

.card-body h2 {
  font-size: 1.2rem;
}

.card-body p {
  color: var(--muted);
  font-size: 0.95rem;
  flex: 1;
}

.layout-demo {
  display: grid;
  grid-template-columns: 220px 1fr;
  grid-template-rows: auto 1fr auto;
  grid-template-areas:
    "header header"
    "sidebar main"
    "footer footer";
  gap: 1rem;
  min-height: 70vh;
}

.layout-demo > * {
  border-radius: var(--radius);
  padding: 1.5rem;
}

.demo-header {
  grid-area: header;
  background: linear-gradient(135deg, var(--accent), #9b6df5);
  color: #fff;
}

.demo-sidebar {
  grid-area: sidebar;
  background: var(--surface);
  border: 1px solid var(--border);
}

.demo-sidebar ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.demo-sidebar a {
  color: var(--muted);
  text-decoration: none;
}

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

.demo-main {
  grid-area: main;
  background: var(--surface);
  border: 1px solid var(--border);
}

.demo-main h2 {
  margin-bottom: 0.5rem;
}

.demo-main p + p {
  margin-top: 0.75rem;
}

.demo-footer {
  grid-area: footer;
  background: var(--ink);
  color: #cfd6e4;
  text-align: center;
}

@media (max-width: 700px) {
  .layout-demo {
    grid-template-columns: 1fr;
    grid-template-areas:
      "header"
      "sidebar"
      "main"
      "footer";
  }
}

.gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-rows: 220px;
  gap: 1rem;
}

.gallery figure {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.gallery img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.35s ease;
}

.gallery figure:hover img {
  transform: scale(1.08);
}

.gallery figcaption {
  position: absolute;
  inset: auto 0 0 0;
  padding: 2rem 1rem 0.9rem;
  background: linear-gradient(transparent, rgba(15, 18, 28, 0.85));
  color: #fff;
  font-weight: 600;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.gallery figure:hover figcaption {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 800px) {
  .gallery { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 500px) {
  .gallery { grid-template-columns: 1fr; }
}

.portfolio-hero {
  background: linear-gradient(135deg, var(--accent), #9b6df5);
  color: #fff;
  border-radius: var(--radius);
  padding: 2.5rem;
  margin-bottom: 2rem;
}

.portfolio-hero p {
  max-width: 55ch;
  opacity: 0.9;
}

.portfolio-main {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1.5rem;
  align-items: start;
}

.projects {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.25rem;
}

.project-card {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem;
  box-shadow: var(--shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lift);
}

.project-card h3 {
  font-size: 1.1rem;
}

.project-card p {
  color: var(--muted);
  font-size: 0.93rem;
  flex: 1;
}

.project-card .btn {
  align-self: flex-start;
}

.portfolio-aside {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  position: sticky;
  top: 5rem;
}

.portfolio-aside h2 {
  font-size: 1.15rem;
  margin-bottom: 0.75rem;
}

.portfolio-aside ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.portfolio-aside li strong {
  color: var(--ink);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.skill-tags span {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.25rem 0.75rem;
  font-size: 0.82rem;
  color: var(--muted);
}

@media (max-width: 800px) {
  .portfolio-main { grid-template-columns: 1fr; }
  .portfolio-aside { position: static; }
}

.site-footer {
  background: var(--ink);
  color: #cfd6e4;
  text-align: center;
  padding: 1.5rem 1rem;
}

.site-footer a {
  color: #fff;
}