:root {
  --bg: #02040a;
  --bg-elevated: #111827;
  --bg-elevated-soft: #0b1220;
  --accent: #00bcd4;
  --accent-soft: rgba(0, 188, 212, 0.12);
  --accent-strong: #00e5ff;
  --text-main: #f9fafb;
  --text-muted: #9ca3af;
  --border-subtle: #1f2933;
  --danger: #ef4444;
  --shadow-soft: 0 20px 35px rgba(0, 0, 0, 0.7);
  --radius-lg: 18px;
  --radius-xl: 24px;
  --transition-fast: 0.18s ease-out;
  --max-width: 1120px;
}

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

html,
body {
  margin: 0;
  padding: 0;
  font-family: "Roboto", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  background: radial-gradient(circle at top, #111827 0, #02040a 50%, #02040a 100%);
  color: var(--text-main);
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* App bar / navigation */

.app-bar {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: linear-gradient(
    to bottom,
    rgba(3, 7, 18, 0.96),
    rgba(3, 7, 18, 0.85),
    transparent
  );
  border-bottom: 1px solid rgba(55, 65, 81, 0.5);
}

.app-bar-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.7rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

.logo-icon {
  font-size: 1.8rem;
  color: var(--accent-strong);
}

.logo-text {
  font-weight: 600;
  letter-spacing: 0.04em;
  font-size: 1.05rem;
  text-transform: uppercase;
  color: var(--text-main);
}

/* Nav links */

.nav-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-link {
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--text-muted);
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  transition: background var(--transition-fast), color var(--transition-fast),
    transform var(--transition-fast);
}

.nav-link:hover {
  background: var(--accent-soft);
  color: var(--accent-strong);
  transform: translateY(-1px);
}

.nav-link-active {
  background: var(--accent);
  color: #020617;
}

/* Mobile nav toggle */

.nav-toggle {
  display: none;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 0.3rem;
  border-radius: 999px;
}

.nav-toggle .material-icons {
  font-size: 1.7rem;
  color: var(--text-main);
}

/* Layout */

.page {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 1.2rem 1.25rem 3rem;
}

/* Hero */

.hero {
  margin-top: 1.2rem;
  margin-bottom: 1.5rem;
  padding: 1.6rem 1.5rem;
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at top left, rgba(56, 189, 248, 0.25), transparent 55%),
    radial-gradient(circle at top right, rgba(14, 165, 233, 0.18), transparent 60%),
    linear-gradient(135deg, #020617, #020617, #020617);
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(75, 85, 99, 0.6);
}

.hero-text h1 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  margin: 0 0 0.5rem;
}

.hero-text p {
  margin: 0;
  color: var(--text-muted);
  max-width: 36rem;
  line-height: 1.6;
}

/* ---------- BLOG: SINGLE-COLUMN EXPANDABLE CARDS ---------- */

/* Single column list */

.blog-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1rem;
}

/* Cards (shared base) */

.card,
.blog-card {
  background: linear-gradient(135deg, var(--bg-elevated-soft), #020617);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(55, 65, 81, 0.8);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.85);
}

/* Blog card base */

.blog-card {
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    border-color var(--transition-fast),
    background var(--transition-fast);
  overflow: hidden;
}

.blog-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.95);
  border-color: var(--accent-strong);
}

/* Main row: circular image + header + toggle icon */

.blog-card-main {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.9rem 1rem;
  cursor: pointer;
}

/* Circular image on the left */

.blog-card-image-wrapper {
  flex-shrink: 0;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  overflow: hidden;
  border: 2px solid rgba(148, 163, 184, 0.9);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.9);
  background: radial-gradient(circle at top, #1f2937, #020617);
}

.blog-card-image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Text area */

.blog-card-header {
  flex: 1;
  min-width: 0;
}

.blog-card-header h2 {
  font-size: 1rem;
  margin: 0 0 0.1rem;
}

.blog-card-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
}

.blog-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem;
}

.blog-tag-chip {
  border-radius: 999px;
  padding: 0.05rem 0.5rem;
  background: rgba(148, 163, 184, 0.12);
  border: 1px solid rgba(148, 163, 184, 0.3);
  font-size: 0.7rem;
}

/* Toggle icon (chevron) */

.blog-card-toggle-icon {
  flex-shrink: 0;
  font-size: 1.5rem;
  color: var(--accent-strong);
  transition: transform var(--transition-fast);
}

.blog-card.expanded .blog-card-toggle-icon {
  transform: rotate(180deg);
}

/* Expanded body */

.blog-card-body {
  border-top: 1px solid rgba(55, 65, 81, 0.7);
  padding: 0 1rem 1rem;
}

.blog-card-body[hidden] {
  display: none;
}

/* Markdown content inside expanded card */

.blog-post-content {
  font-size: 0.95rem;
  line-height: 1.7;
}

.blog-post-content h1 {
  font-size: 1.25rem;
  margin: 0.6rem 0 0.4rem;
}

.blog-post-content h2 {
  font-size: 1.15rem;
  margin-top: 1.1rem;
  margin-bottom: 0.3rem;
}

.blog-post-content h3 {
  font-size: 1rem;
  margin-top: 0.9rem;
  margin-bottom: 0.25rem;
}

.blog-post-content p {
  margin: 0.4rem 0;
}

.blog-post-content a {
  color: var(--accent-strong);
  text-decoration: none;
}

.blog-post-content a:hover {
  text-decoration: underline;
}

.blog-post-content img {
  max-width: 100%;
  border-radius: 10px;
  margin: 0.5rem 0;
}

.blog-post-content code {
  font-family: "JetBrains Mono", "Fira Code", ui-monospace, SFMono-Regular, Menlo,
    Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.88rem;
  background: rgba(15, 23, 42, 0.95);
  border-radius: 6px;
  padding: 0.15rem 0.3rem;
  border: 1px solid rgba(55, 65, 81, 0.8);
}

.blog-post-content pre code {
  display: block;
  padding: 0.8rem 0.9rem;
  overflow-x: auto;
}

/* ---------- GENERIC PAGE SECTIONS (ABOUT, CONTACT) ---------- */

.page-section {
  margin-top: 1.8rem;
}

.page-section h1 {
  font-size: 1.6rem;
  margin-bottom: 1rem;
}

.card {
  padding: 1.1rem 1.3rem;
}

.card p {
  margin: 0.4rem 0;
  color: var(--text-muted);
}

/* Contact list */

.contact-list {
  list-style: none;
  padding: 0;
  margin: 0.5rem 0 0.8rem;
}

.contact-list li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.4rem;
  color: var(--text-muted);
}

.contact-list .material-icons {
  font-size: 1rem;
  color: var(--accent-strong);
}

.contact-list a {
  color: var(--accent-strong);
  text-decoration: none;
}

.contact-list a:hover {
  text-decoration: underline;
}

.contact-note {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Footer */

.footer {
  border-top: 1px solid rgba(55, 65, 81, 0.7);
  padding: 0.8rem 1.25rem 1.3rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  backdrop-filter: blur(10px);
}

/* Responsive */

@media (max-width: 640px) {
  .app-bar-inner {
    padding-inline: 0.85rem;
  }

  .nav-links {
    position: absolute;
    top: 100%;
    right: 0;
    padding: 0.5rem 0.8rem 0.7rem;
    margin: 0.3rem 0.6rem 0;
    flex-direction: column;
    align-items: flex-start;
    background: rgba(15, 23, 42, 0.98);
    border-radius: 16px;
    border: 1px solid rgba(55, 65, 81, 0.9);
    box-shadow: var(--shadow-soft);
    transform-origin: top right;
    transform: scale(0.9);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease-out, transform 0.15s ease-out;
  }

  .nav-links.nav-open {
    opacity: 1;
    pointer-events: auto;
    transform: scale(1);
  }

  .nav-toggle {
    display: inline-flex;
  }
}