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

:root {
  --surface: #f2f7ff;
  --surface-container: #d9eaff;
  --surface-container-lowest: #ffffff;
  --surface-container-highest: #c5dfff;
  --primary: #006573;
  --primary-container: #51e5ff;
  --secondary: #775600;
  --secondary-container: #f3be4e;
  --tertiary: #b30065;
  --tertiary-container: #ec368d;
  --on-surface: #0d314d;
  --on-surface-variant: #294151;
  --on-primary: #ffffff;
  --on-primary-container: #003743;
  --on-secondary-container: #5d4300;
  --on-tertiary-container: #5c0032;
  --radius-xl: 3rem;
  --radius-lg: 2rem;
  --radius-md: 1.5rem;
  --shadow-ambient: 0 20px 40px rgba(13, 49, 77, 0.08);
}

body {
  font-family: "Plus Jakarta Sans", "Segoe UI", sans-serif;
  background: var(--surface);
  color: var(--on-surface);
  padding: 32px 24px 96px;
  position: relative;
}

body::before,
body::after {
  content: "";
  position: fixed;
  border-radius: 50%;
  z-index: -1;
  filter: blur(0);
}

body::before {
  width: 320px;
  height: 320px;
  top: -120px;
  right: -80px;
  background: radial-gradient(circle, rgba(81, 229, 255, 0.45), transparent 70%);
}

body::after {
  width: 360px;
  height: 360px;
  bottom: -160px;
  left: -120px;
  background: radial-gradient(circle, rgba(236, 54, 141, 0.35), transparent 70%);
}

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

a:hover {
  opacity: 0.85;
}

p {
  font-size: 0.98rem;
  line-height: 1.65;
  color: var(--on-surface-variant);
}

code {
  font-family: "Space Grotesk", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.9rem;
}

.page {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.top-nav {
  background: var(--surface-container);
  border-radius: var(--radius-xl);
  padding: 18px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  animation: slideDown 0.6s ease both;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--on-surface);
}

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(45deg, var(--primary), var(--primary-container));
}

.nav-links {
  display: flex;
  gap: 18px;
  font-weight: 600;
  color: var(--on-surface);
}

.nav-cta {
  background: linear-gradient(45deg, var(--primary), var(--primary-container));
  color: var(--on-primary);
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
}

.hero {
  background: var(--surface-container);
  border-radius: var(--radius-xl);
  padding: 36px 40px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: relative;
  overflow: hidden;
  animation: floatIn 0.8s ease 0.1s both;
}

.hero-top {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 32px;
  align-items: start;
}

.hero-kicker {
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.72rem;
  color: var(--tertiary);
  display: inline-block;
  margin-bottom: 12px;
}

h1,
h2,
h3 {
  color: var(--on-surface);
}

h1 {
  font-size: 3.5rem;
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.lead {
  font-size: 1.05rem;
  color: var(--on-surface-variant);
}

h1 span {
  color: var(--on-primary);
  padding: 4px 14px;
  border-radius: 1rem;
  display: inline-block;
}

#html {
  background-color: var(--primary);
  transform: rotate(3deg);
}

#css {
  background-color: var(--tertiary);
  transform: rotate(1deg);
}

#js {
  background-color: var(--secondary-container);
  color: var(--on-secondary-container);
  transform: rotate(-4deg);
}

.hero-card {
  background: rgba(242, 247, 255, 0.7);
  backdrop-filter: blur(24px);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: var(--shadow-ambient);
}

.hero-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.avatar {
  background: linear-gradient(45deg, var(--primary), var(--primary-container));
  color: white;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.counts {
  display: flex;
  gap: 10px;
  align-items: center;
}

.count {
  text-align: center;
  padding: 8px 12px;
  border-radius: 1rem;
  background: var(--surface-container-lowest);
  color: var(--on-surface);
}

.count small {
  display: block;
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  color: var(--on-surface-variant);
}

.filter-label {
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
}

.filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.pill {
  border: none;
  border-radius: 999px;
  padding: 8px 12px;
  cursor: pointer;
  font-size: 0.72rem;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--surface-container-lowest);
  color: var(--on-surface);
}

.pill.is-active {
  background: linear-gradient(45deg, var(--primary), var(--primary-container));
  color: var(--on-primary);
}

.pill.tag-html {
  background: var(--primary-container);
  color: var(--on-primary-container);
}

.pill.tag-css {
  background: var(--tertiary-container);
  color: var(--on-tertiary-container);
}

.pill.tag-js {
  background: var(--secondary-container);
  color: var(--on-secondary-container);
}

.hero-copy {
  background: var(--surface-container-lowest);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  display: grid;
  gap: 12px;
}

main {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.section-shell {
  background: var(--surface-container);
  border-radius: var(--radius-xl);
  padding: 32px;
  display: grid;
  gap: 24px;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 20px;
}

.section-label {
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-size: 0.72rem;
  color: var(--primary);
}

.section-css .section-label {
  color: var(--tertiary);
}

.section-js .section-label {
  color: var(--secondary);
}

h2 {
  font-size: 2.1rem;
  margin: 8px 0 10px;
}

.section-intro {
  max-width: 560px;
}

.section-cta {
  background: var(--surface-container-lowest);
  border-radius: 999px;
  padding: 10px 18px;
  font-size: 0.85rem;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
}

.notes-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 24px;
}

.section-seo .notes-grid {
  display: flex;
  flex-wrap: wrap;
}

.section-seo .notes-grid .note-card {
  flex: 30% 1 1;
  
}

@media screen and (max-width: 680px) {
.notes-grid {
  display: flex;
  flex-direction: column;
}
  .notes-grid .note-card  {
    flex: auto 0 0;
    min-width: unset;
    max-width: 100%;
  }
  .notes-grid .note-card pre {
    display: none;
  }
}

.note-card {
  background: var(--surface-container-lowest);
  border-radius: var(--radius-xl);
  padding: 34px 28px 40px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: relative;
  animation: floatIn 0.7s ease both;
}

.notes-grid .note-card:nth-child(2) {
  animation-delay: 0.04s;
}

.notes-grid .note-card:nth-child(3) {
  animation-delay: 0.08s;
}

.notes-grid .note-card:nth-child(4) {
  animation-delay: 0.12s;
}

.notes-grid .note-card:nth-child(5) {
  animation-delay: 0.16s;
}

.notes-grid .note-card:nth-child(6) {
  animation-delay: 0.2s;
}

.notes-grid .note-card:nth-child(3n) {
  margin-top: 12px;
}

.notes-grid .note-card:nth-child(4n) {
  margin-top: -8px;
}

.chip {
  position: absolute;
  top: -12px;
  left: 24px;
  padding: 6px 12px;
  border-radius: 999px;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--primary-container);
  color: var(--on-primary-container);
}

.chip-css {
  background: var(--tertiary-container);
  color: var(--on-tertiary-container);
}

.chip-js {
  background: var(--secondary-container);
  color: var(--on-secondary-container);
}

.note-card h3 {
  font-size: 1.4rem;
  margin-top: 6px;
}

.note-card pre {
  background: var(--surface-container-highest);
  padding: 14px;
  border-radius: var(--radius-md);
  overflow: auto;
  color: var(--on-surface);
}

.callout {
  background: var(--surface-container);
  border-radius: var(--radius-xl);
  padding: 16px;
}

.callout-card {
  background: var(--surface-container-lowest);
  border-radius: var(--radius-xl);
  padding: 32px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.8fr);
  gap: 24px;
  align-items: center;
}

.callout-media {
  border-radius: var(--radius-lg);
  min-height: 180px;
  background: radial-gradient(circle at top, rgba(81, 229, 255, 0.6), rgba(236, 54, 141, 0.2));
}

.primary-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(45deg, var(--primary), var(--primary-container));
  color: var(--on-primary);
  padding: 12px 20px;
  border-radius: 999px;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  font-size: 0.9rem;
  margin-top: 12px;
}

.site-footer {
  background: var(--surface-container);
  border-radius: var(--radius-xl);
  padding: 20px 28px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: var(--on-surface-variant);
  font-size: 0.85rem;
}

.fab {
  position: fixed;
  right: 28px;
  bottom: 28px;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: none;
  background: rgba(236, 54, 141, 0.85);
  backdrop-filter: blur(24px);
  color: white;
  font-size: 1.6rem;
  box-shadow: var(--shadow-ambient);
  cursor: pointer;
}

.fab:hover {
  transform: translateY(-2px);
}

.decoration {
  text-decoration: underline dashed;
}

@keyframes floatIn {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 980px) {
  .hero-top {
    grid-template-columns: 1fr;
  }
  .hero-card {
    max-width: 420px;
  }
  .section-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .callout-card {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  body {
    padding: 20px 16px 84px;
  }
  .top-nav {
    flex-wrap: wrap;
  }
  .nav-links {
    width: 100%;
    justify-content: space-between;
  }
  .nav-cta {
    width: 100%;
    text-align: center;
  }
  h1 {
    font-size: 2.6rem;
  }
  .hero {
    padding: 28px;
  }
  .section-shell {
    padding: 24px;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 2.2rem;
  }
  .hero-card {
    width: 100%;
  }
  .counts {
    flex-direction: column;
    align-items: flex-start;
  }
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}