@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap");

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  height: 100%;
}

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text-color);
  background: radial-gradient(circle at top left, #f3e9ff 0, #ffffff 40%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--header-bg);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-color);
}

.site-header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.brand-mark {
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}

.brand-title {
  font-size: 0.95rem;
}

.main-nav ul {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.9rem;
}

.main-nav a {
  position: relative;
  padding: 0.25rem 0;
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.1rem;
  height: 2px;
  width: 0;
  background: var(--accent);
  transition: width 0.2s ease;
}

.main-nav a:hover::after,
.main-nav li.is-active a::after {
  width: 100%;
}

.nav-pill a {
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  background: #111827;
  color: #f9fafb;
}

.nav-toggle {
  display: none;
}

.nav-toggle-button {
  display: none;
}

@media (max-width: 768px) {
  .main-nav ul {
    position: fixed;
    inset: 3.5rem 0 auto 0;
    padding: 1rem 1.5rem;
    background: rgba(255,255,255,0.98);
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
    transform: translateY(-120%);
    transition: transform 0.2s ease;
  }

  .nav-toggle-button {
    display: inline-flex;
    flex-direction: column;
    gap: 0.2rem;
    cursor: pointer;
  }

  .nav-toggle-button span {
    width: 1.4rem;
    height: 2px;
    background: #111827;
  }

  .nav-toggle:checked ~ .nav-toggle-button span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle:checked ~ .nav-toggle-button span:nth-child(1) {
    transform: translateY(4px) rotate(45deg);
  }
  .nav-toggle:checked ~ .nav-toggle-button span:nth-child(3) {
    transform: translateY(-4px) rotate(-45deg);
  }

  .nav-toggle:checked ~ .main-nav ul {
    transform: translateY(0);
  }
}

.page-main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
  flex: 1;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1.2fr);
  gap: 3rem;
  align-items: center;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-size: 0.75rem;
  color: #6b21a8;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.hero-title {
  font-size: clamp(2.2rem, 4vw, 3rem);
  margin: 0 0 0.75rem;
}

.hero-lead {
  font-size: 1rem;
  color: #4b5563;
  margin-bottom: 1.5rem;
}

.hero-body {
  font-size: 0.95rem;
  line-height: 1.7;
  color: #374151;
}

.hero-actions {
  margin-top: 1.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.6rem;
  border-radius: 999px;
  border: 2px solid transparent;
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  cursor: pointer;
  min-height: 44px;
  transition: all 0.2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  border-color: transparent;
  color: #ffffff;
  box-shadow: 0 12px 30px rgba(124,58,237,0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 40px rgba(124,58,237,0.5);
}

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

.btn-ghost:hover {
  background: var(--accent);
  color: #ffffff;
  box-shadow: 0 10px 30px rgba(124,58,237,0.35);
}

.hero-visual {
  align-self: stretch;
  display: flex;
  align-items: center;
  justify-content: center;
}

.code-card {
  width: 100%;
  max-width: 420px;
  border-radius: 16px;
  background: #0f172a;
  color: #e5e7eb;
  box-shadow: 0 20px 50px rgba(15,23,42,0.7);
  overflow: hidden;
  font-family: "JetBrains Mono", "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

.code-card-header {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  background: #020617;
  font-size: 0.7rem;
  color: #9ca3af;
}

.code-card-header .dot {
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 999px;
}
.code-card-header .dot.red { background: #f97373; }
.code-card-header .dot.yellow { background: #facc15; }
.code-card-header .dot.green { background: #4ade80; }

.code-card-body {
  margin: 0;
  padding: 0.9rem 1rem 1.1rem;
  font-size: 0.78rem;
  line-height: 1.6;
  white-space: pre;
  overflow-x: auto;
}

.page-header {
  margin-bottom: 2rem;
}

.page-header h1 {
  font-size: 1.9rem;
  margin: 0 0 0.4rem;
}

.page-intro {
  max-width: 40rem;
  color: #4b5563;
}

.post-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.post-card {
  border-radius: 16px;
  padding: 1.5rem 1.75rem;
  background: rgba(255,255,255,0.9);
  box-shadow: 0 12px 30px rgba(15,23,42,0.08);
}

.post-card-header h2 {
  margin: 0 0 0.35rem;
  font-size: 1.25rem;
}

.post-card-header .meta {
  font-size: 0.8rem;
  color: #6b7280;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.post-card-body {
  margin-top: 0.8rem;
  font-size: 0.95rem;
  color: #374151;
}

.tags {
  list-style: none;
  padding: 0;
  margin: 0.75rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  border: 1px solid rgba(148,163,184,0.7);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #64748b;
}

.post-card-footer {
  margin-top: 0.8rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.post-card-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
}

.single-post {
  max-width: 720px;
  margin: 0 auto;
}

.single-post-header h1 {
  margin: 0 0 0.5rem;
  font-size: 2rem;
}

.single-post-header .meta {
  font-size: 0.85rem;
  color: #6b7280;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.single-post-body {
  margin-top: 1.5rem;
}

.single-post-media {
  margin: 0 0 1.5rem;
}

.single-post-content {
  font-size: 0.98rem;
  line-height: 1.8;
}

.single-post-content p {
  margin: 0 0 1rem;
}

.page-content {
  max-width: 720px;
  margin: 0 auto;
}

.rich-text p {
  margin: 0 0 1rem;
  line-height: 1.8;
}

/* Contact form
-------------------------------------------------- */
.contact-wrapper {
  margin-top: 1.5rem;
}

.contact-wrapper form {
  margin-top: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-wrapper .form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

@media (max-width: 640px) {
  .contact-wrapper .form-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

.field label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.field input,
.field textarea {
  width: 100%;
  font: inherit;
  padding: 0.6rem 0.75rem;
  border-radius: 8px;
  border: 1px solid #d1d5db;
  background: #ffffff;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}

.field input:focus,
.field textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(124,58,237,0.35);
}

.submit-field {
  margin-top: 0.5rem;
}

.alert {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
}

.alert-success {
  background: #ecfdf3;
  color: #166534;
  border: 1px solid #bbf7d0;
}

.alert-danger {
  background: #fef2f2;
  color: #b91c1c;
  border: 1px solid #fecaca;
}

.site-footer {
  border-top: 1px solid rgba(0,0,0,0.06);
  padding: 1.5rem 1.5rem 2rem;
  font-size: 0.8rem;
  color: #6b7280;
  margin-top: auto;
}

.site-footer a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

.site-footer a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.site-footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  text-align: center;
}

.heart {
  color: var(--accent-secondary);
}

.scroll-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  border: none;
  background: #111827;
  color: #f9fafb;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 12px 30px rgba(15,23,42,0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.scroll-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

@media (max-width: 768px) {
  .hero {
    grid-template-columns: minmax(0,1fr);
    gap: 2rem;
  }

  .page-main {
    padding-top: 2.5rem;
  }
}

/* Dark Mode Toggle Button
-------------------------------------------------- */
.theme-toggle {
  background: var(--header-bg);
  border: 2px solid var(--border-color);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  margin-left: 1rem;
  padding: 0;
  position: relative;
}

.theme-toggle:hover {
  transform: scale(1.1);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] .theme-toggle {
  background: var(--header-bg);
  border-color: var(--border-color);
}

.theme-toggle-icon {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.theme-icon-light,
.theme-icon-dark,
.theme-icon-system {
  position: absolute;
  opacity: 0;
  transform: scale(0.8);
  pointer-events: none;
}

.theme-toggle[data-theme="light"] .theme-icon-light,
.theme-toggle[data-theme="dark"] .theme-icon-dark,
.theme-toggle[data-theme="system"] .theme-icon-system {
  opacity: 1;
  transform: scale(1);
  pointer-events: auto;
}

/* Dark Mode Styles
-------------------------------------------------- */
body {
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.3s ease, color 0.3s ease;
}

[data-theme="dark"] body {
  background: radial-gradient(circle at top left, #1a0a2e 0, #1a1a1a 40%);
  color: var(--text-color);
}

[data-theme="dark"] .site-header {
  background: var(--header-bg);
  border-bottom-color: var(--border-color);
}

[data-theme="dark"] .site-header-inner {
  color: var(--text-color);
}

[data-theme="dark"] .brand-title,
[data-theme="dark"] .main-nav a {
  color: var(--text-color);
}

[data-theme="dark"] .main-nav a:hover {
  color: var(--accent);
}

[data-theme="dark"] .page-main {
  background-color: transparent;
  color: var(--text-color);
}

[data-theme="dark"] .post-card,
[data-theme="dark"] .single-post,
[data-theme="dark"] .code-card {
  background-color: var(--card-bg);
  border-color: var(--border-color);
  color: var(--text-color);
}

[data-theme="dark"] .post-card-header h2 a,
[data-theme="dark"] .single-post-header h1 {
  color: var(--text-color);
}

[data-theme="dark"] .post-card-body,
[data-theme="dark"] .single-post-content,
[data-theme="dark"] .rich-text {
  color: var(--text-color);
}

[data-theme="dark"] .code-card-body {
  background-color: var(--code-bg);
  color: var(--text-color);
}

[data-theme="dark"] .tag {
  background-color: var(--card-bg);
  color: var(--text-color);
  border-color: var(--border-color);
}

[data-theme="dark"] .form-grid input,
[data-theme="dark"] .form-grid textarea {
  background-color: var(--card-bg);
  color: var(--text-color);
  border-color: var(--border-color);
}

[data-theme="dark"] .form-grid input:focus,
[data-theme="dark"] .form-grid textarea:focus {
  border-color: var(--accent);
}

[data-theme="dark"] .alert {
  color: var(--text-color);
}

[data-theme="dark"] .alert-success {
  background-color: rgba(21, 87, 36, 0.3);
  border-color: #c3e6cb;
}

[data-theme="dark"] .alert-danger {
  background-color: rgba(114, 28, 36, 0.3);
  border-color: #f5c6cb;
}

[data-theme="dark"] .scroll-top {
  background: var(--card-bg);
  color: var(--text-color);
  border: 1px solid var(--border-color);
}

[data-theme="dark"] .site-footer {
  border-top-color: var(--border-color);
  color: var(--text-color);
}