/* ==========================================================================
   The Curious One — Magazine-Style Curiosity Website
   Design System + All Styles
   ========================================================================== */

/* ---------- CSS Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { min-height: 100vh; text-rendering: optimizeLegibility; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
img, picture, video, canvas, svg { display: block; max-width: 100%; }
input, button, textarea, select { font: inherit; }
p, h1, h2, h3, h4, h5, h6 { overflow-wrap: break-word; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; }

/* ---------- Design Tokens ---------- */
:root {
  /* Colors — Light Theme */
  --color-bg:             #FAFAF8;
  --color-bg-secondary:   #F0EDE6;
  --color-bg-tertiary:    #E8E4DC;
  --color-bg-card:        #FFFFFF;
  --color-bg-hero:        rgba(0, 0, 0, 0.45);
  --color-bg-nav:         rgba(250, 250, 248, 0.95);

  --color-text:           #1A1A1A;
  --color-text-secondary: #4A4A4A;
  --color-text-tertiary:  #7A7A7A;
  --color-text-inverse:   #FAFAF8;

  --color-accent:         #C6A84B;
  --color-accent-hover:   #B8982F;
  --color-blue:           #2E86AB;
  --color-magenta:        #A23B72;

  --color-border:         #D4D0C8;
  --color-border-light:   #E8E4DC;

  /* Category Colors */
  --cat-science:     #2E86AB;
  --cat-space:       #1B1464;
  --cat-history:     #8B6914;
  --cat-technology:  #00B4D8;
  --cat-nature:      #2D6A4F;
  --cat-body:        #E63946;
  --cat-ocean:       #0077B6;
  --cat-culture:     #9B5DE5;

  /* Typography */
  --font-display:    'Playfair Display', Georgia, serif;
  --font-body:       'Source Sans 3', 'Segoe UI', Roboto, sans-serif;

  --text-xs:    clamp(0.70rem, 0.65rem + 0.25vw, 0.80rem);
  --text-sm:    clamp(0.80rem, 0.75rem + 0.30vw, 0.90rem);
  --text-base:  clamp(0.95rem, 0.90rem + 0.30vw, 1.10rem);
  --text-lg:    clamp(1.10rem, 1.00rem + 0.50vw, 1.30rem);
  --text-xl:    clamp(1.30rem, 1.10rem + 0.80vw, 1.65rem);
  --text-2xl:   clamp(1.60rem, 1.30rem + 1.20vw, 2.20rem);
  --text-3xl:   clamp(2.00rem, 1.50rem + 2.00vw, 3.20rem);
  --text-4xl:   clamp(2.50rem, 1.80rem + 3.00vw, 4.50rem);
  --text-hero:  clamp(3.00rem, 2.00rem + 4.50vw, 6.50rem);

  /* Spacing */
  --space-2xs:  0.25rem;
  --space-xs:   0.5rem;
  --space-sm:   0.75rem;
  --space-md:   1rem;
  --space-lg:   1.5rem;
  --space-xl:   2rem;
  --space-2xl:  3rem;
  --space-3xl:  4rem;
  --space-4xl:  6rem;
  --space-5xl:  8rem;

  /* Layout */
  --container-max:    1280px;
  --container-narrow: 800px;
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  16px;
  --radius-xl:  24px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.08);
  --shadow-md:  0 4px 12px rgba(0,0,0,0.10);
  --shadow-lg:  0 8px 30px rgba(0,0,0,0.12);
  --shadow-xl:  0 16px 50px rgba(0,0,0,0.16);

  /* Transitions */
  --ease-fast:   150ms ease;
  --ease-base:   300ms ease;
  --ease-slow:   500ms ease;
  --ease-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ---------- Dark Theme ---------- */
[data-theme="dark"] {
  --color-bg:             #121212;
  --color-bg-secondary:   #1E1E1E;
  --color-bg-tertiary:    #2A2A2A;
  --color-bg-card:        #1E1E1E;
  --color-bg-hero:        rgba(0, 0, 0, 0.65);
  --color-bg-nav:         rgba(18, 18, 18, 0.95);

  --color-text:           #E8E4DC;
  --color-text-secondary: #B0ACA4;
  --color-text-tertiary:  #7A7A7A;
  --color-text-inverse:   #1A1A1A;

  --color-accent:         #D4B85C;
  --color-accent-hover:   #E0C96A;
  --color-blue:           #48A9C5;
  --color-magenta:        #C75B9B;

  --color-border:         #3A3A3A;
  --color-border-light:   #2A2A2A;

  --shadow-sm:  0 1px 3px rgba(0,0,0,0.30);
  --shadow-md:  0 4px 12px rgba(0,0,0,0.35);
  --shadow-lg:  0 8px 30px rgba(0,0,0,0.40);
  --shadow-xl:  0 16px 50px rgba(0,0,0,0.50);
}

/* ---------- Base Styles ---------- */
body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  transition: background var(--ease-base), color var(--ease-base);
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--color-bg-nav);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  transition: background var(--ease-base), box-shadow var(--ease-base);
}

.nav.scrolled {
  box-shadow: var(--shadow-md);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.nav__logo {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
  transition: color var(--ease-fast);
}

.nav__logo span {
  color: var(--color-accent);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  transition: color var(--ease-fast);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--ease-base);
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-accent);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

/* Category dropdown */
.nav__dropdown {
  position: relative;
}

.nav__dropdown-menu {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-sm) 0;
  min-width: 220px;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--ease-fast), transform var(--ease-fast), visibility var(--ease-fast);
  pointer-events: none;
}

.nav__dropdown:hover .nav__dropdown-menu,
.nav__dropdown.open .nav__dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

.nav__dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-lg);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: background var(--ease-fast), color var(--ease-fast);
}

.nav__dropdown-item:hover {
  background: var(--color-bg-secondary);
  color: var(--color-text);
}

.nav__dropdown-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* Nav actions */
.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav__action-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--color-text-secondary);
  transition: background var(--ease-fast), color var(--ease-fast);
}

.nav__action-btn:hover {
  background: var(--color-bg-secondary);
  color: var(--color-text);
}

.nav__action-btn svg {
  width: 20px;
  height: 20px;
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: 4px 0;
}

.nav__hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--ease-base), opacity var(--ease-base);
}

.nav__hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav__hamburger.active span:nth-child(2) {
  opacity: 0;
}
.nav__hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile menu */
.nav__mobile-menu {
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg);
  padding: var(--space-2xl) var(--space-lg);
  transform: translateX(100%);
  transition: transform var(--ease-base);
  overflow-y: auto;
  z-index: 999;
}

.nav__mobile-menu.open {
  transform: translateX(0);
}

.nav__mobile-link {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border-light);
  color: var(--color-text);
}

.nav__mobile-link:hover {
  color: var(--color-accent);
}

.nav__mobile-category {
  display: block;
  font-size: var(--text-lg);
  padding: var(--space-sm) 0;
  padding-left: var(--space-lg);
  color: var(--color-text-secondary);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  z-index: -2;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(0,0,0,0.3) 0%,
    rgba(0,0,0,0.5) 50%,
    rgba(0,0,0,0.8) 100%
  );
  z-index: -1;
}

.hero__content {
  max-width: 900px;
  padding: var(--space-xl);
  color: var(--color-text-inverse);
}

.hero__eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  margin-bottom: var(--space-lg);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 900;
  line-height: 1.05;
  margin-bottom: var(--space-lg);
}

.hero__subtitle {
  font-size: var(--text-xl);
  font-weight: 400;
  line-height: 1.5;
  color: rgba(255,255,255,0.85);
  max-width: 650px;
  margin: 0 auto var(--space-2xl);
}

.hero__actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-2xl);
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255,255,255,0.6);
  animation: bounce 2s ease infinite;
}

.hero__scroll svg {
  width: 32px;
  height: 32px;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-12px); }
  60% { transform: translateX(-50%) translateY(-6px); }
}

/* Category hero (shorter) */
.hero--category {
  min-height: 50vh;
}

.hero--about {
  min-height: 60vh;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-xl);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-radius: var(--radius-sm);
  transition: all var(--ease-base);
}

.btn--primary {
  background: var(--color-accent);
  color: #1A1A1A;
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(198, 168, 75, 0.4);
}

.btn--outline {
  border: 2px solid rgba(255,255,255,0.6);
  color: #fff;
}

.btn--outline:hover {
  border-color: #fff;
  background: rgba(255,255,255,0.1);
  transform: translateY(-2px);
}

.btn--dark {
  background: var(--color-text);
  color: var(--color-bg);
}

.btn--dark:hover {
  opacity: 0.9;
  transform: translateY(-2px);
}

/* ---------- Section Styles ---------- */
.section {
  padding: var(--space-4xl) 0;
}

.section--alt {
  background: var(--color-bg-secondary);
}

.section--accent {
  background: linear-gradient(135deg, #1A1A1A 0%, #2A2A2A 100%);
  color: var(--color-text-inverse);
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section__eyebrow {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.section__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.section__rule {
  width: 60px;
  height: 3px;
  background: var(--color-accent);
  margin: var(--space-md) auto 0;
  border-radius: 2px;
}

.section__desc {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: var(--space-md) auto 0;
}

/* ---------- Featured Grid ---------- */
.featured-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto;
  gap: var(--space-lg);
}

.featured-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: transform var(--ease-base), box-shadow var(--ease-base);
}

.featured-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.featured-card:first-child {
  grid-row: 1 / 3;
}

.featured-card__img {
  width: 100%;
  height: 100%;
  min-height: 300px;
  object-fit: cover;
}

.featured-card:first-child .featured-card__img {
  min-height: 100%;
}

.featured-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0.1) 60%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-xl);
}

.featured-card__badge {
  display: inline-block;
  width: fit-content;
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: var(--space-2xs) var(--space-sm);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-sm);
  color: #fff;
}

.featured-card__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: #fff;
  margin-bottom: var(--space-xs);
  line-height: 1.2;
}

.featured-card:not(:first-child) .featured-card__title {
  font-size: var(--text-xl);
}

.featured-card__excerpt {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.8);
  line-height: 1.5;
}

/* ---------- Did You Know Ribbon ---------- */
.ribbon {
  background: var(--color-accent);
  color: #1A1A1A;
  padding: var(--space-md) 0;
  overflow: hidden;
  position: relative;
}

.ribbon__track {
  display: flex;
  gap: var(--space-3xl);
  animation: scroll-ribbon 30s linear infinite;
  white-space: nowrap;
}

.ribbon__item {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.ribbon__item::before {
  content: '\2727';
  font-size: var(--text-xl);
}

@keyframes scroll-ribbon {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ---------- Category Cards Grid ---------- */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

.category-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 3 / 4;
  cursor: pointer;
  transition: transform var(--ease-base), box-shadow var(--ease-base);
}

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

.category-card__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--ease-slow);
}

.category-card:hover .category-card__img {
  transform: scale(1.05);
}

.category-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.85) 0%, rgba(0,0,0,0.2) 50%, rgba(0,0,0,0.1) 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-xl);
  transition: background var(--ease-base);
}

.category-card:hover .category-card__overlay {
  background: linear-gradient(to top, rgba(0,0,0,0.9) 0%, rgba(0,0,0,0.3) 50%, rgba(0,0,0,0.15) 100%);
}

.category-card__icon {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-sm);
}

.category-card__name {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: #fff;
  margin-bottom: var(--space-2xs);
}

.category-card__tagline {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.7);
}

.category-card__count {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #fff;
  background: rgba(0,0,0,0.5);
  padding: var(--space-2xs) var(--space-sm);
  border-radius: var(--radius-sm);
  backdrop-filter: blur(4px);
}

/* ---------- Random Curiosity ---------- */
.random-curiosity {
  max-width: var(--container-narrow);
  margin: 0 auto;
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl) var(--space-3xl);
  box-shadow: var(--shadow-lg);
  text-align: center;
  border: 1px solid var(--color-border-light);
}

.random-curiosity__label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  margin-bottom: var(--space-lg);
}

.random-curiosity__question {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: var(--space-lg);
  line-height: 1.3;
}

.random-curiosity__answer {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--ease-slow), opacity var(--ease-base);
  opacity: 0;
}

.random-curiosity__answer.revealed {
  max-height: 500px;
  opacity: 1;
  margin-bottom: var(--space-lg);
}

.random-curiosity__source {
  font-size: var(--text-sm);
  color: var(--color-accent);
  margin-top: var(--space-md);
}

/* ---------- About Teaser ---------- */
.about-teaser {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.about-teaser__img {
  border-radius: var(--radius-lg);
  width: 100%;
  height: 400px;
  object-fit: cover;
  box-shadow: var(--shadow-lg);
}

.about-teaser__eyebrow {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.about-teaser__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  margin-bottom: var(--space-lg);
}

.about-teaser__text {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-xl);
}

/* ---------- Newsletter ---------- */
.newsletter {
  text-align: center;
  padding: var(--space-4xl) var(--space-lg);
}

.newsletter__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text-inverse);
  margin-bottom: var(--space-sm);
}

.newsletter__subtitle {
  font-size: var(--text-lg);
  color: rgba(255,255,255,0.7);
  margin-bottom: var(--space-2xl);
}

.newsletter__form {
  display: flex;
  gap: var(--space-sm);
  max-width: 500px;
  margin: 0 auto;
}

.newsletter__input {
  flex: 1;
  padding: var(--space-sm) var(--space-lg);
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.1);
  color: #fff;
  font-size: var(--text-base);
  outline: none;
  transition: border-color var(--ease-fast);
}

.newsletter__input::placeholder {
  color: rgba(255,255,255,0.5);
}

.newsletter__input:focus {
  border-color: var(--color-accent);
}

/* ---------- Footer ---------- */
.footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border-light);
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-3xl);
}

.footer__about-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.footer__about-title span {
  color: var(--color-accent);
}

.footer__about-text {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.footer__heading {
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-lg);
  color: var(--color-text);
}

.footer__link {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  padding: var(--space-2xs) 0;
  transition: color var(--ease-fast);
}

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

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border-light);
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

.footer__back-top {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-text-secondary);
  font-weight: 600;
  transition: color var(--ease-fast);
}

.footer__back-top:hover {
  color: var(--color-accent);
}

/* ---------- Curiosity Cards (Category Pages) ---------- */
.curiosity-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

.curiosity-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border-light);
  transition: box-shadow var(--ease-base), transform var(--ease-base);
  position: relative;
}

.curiosity-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.curiosity-card__number {
  position: absolute;
  top: var(--space-md);
  right: var(--space-xl);
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 900;
  color: var(--color-border-light);
  line-height: 1;
  user-select: none;
}

[data-theme="dark"] .curiosity-card__number {
  color: var(--color-bg-tertiary);
}

.curiosity-card__question {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
  line-height: 1.3;
  padding-right: var(--space-3xl);
}

.curiosity-card__teaser {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  font-style: italic;
  margin-bottom: var(--space-lg);
  line-height: 1.6;
}

.curiosity-card__toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-accent);
  cursor: pointer;
  transition: gap var(--ease-fast);
}

.curiosity-card__toggle:hover {
  gap: var(--space-sm);
}

.curiosity-card__toggle svg {
  width: 16px;
  height: 16px;
  transition: transform var(--ease-base);
}

.curiosity-card__toggle.active svg {
  transform: rotate(180deg);
}

.curiosity-card__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--ease-slow);
}

.curiosity-card__answer.open {
  max-height: 600px;
}

.curiosity-card__answer-inner {
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border-light);
  margin-top: var(--space-lg);
}

.curiosity-card__answer-text {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.curiosity-card__source {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-sm);
}

.curiosity-card__source a {
  color: var(--color-blue);
  text-decoration: underline;
  text-decoration-color: transparent;
  transition: text-decoration-color var(--ease-fast);
}

.curiosity-card__source a:hover {
  text-decoration-color: var(--color-blue);
}

.curiosity-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-md);
}

.curiosity-card__tag {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-tertiary);
  background: var(--color-bg-secondary);
  padding: var(--space-2xs) var(--space-sm);
  border-radius: var(--radius-sm);
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.7);
  margin-bottom: var(--space-lg);
}

.breadcrumb a {
  color: rgba(255,255,255,0.7);
  transition: color var(--ease-fast);
}

.breadcrumb a:hover {
  color: #fff;
}

.breadcrumb__sep {
  color: rgba(255,255,255,0.4);
}

/* ---------- Category Intro ---------- */
.category-intro {
  max-width: var(--container-narrow);
  margin: 0 auto;
  text-align: center;
}

.category-intro p {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}

.category-intro blockquote {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  font-style: italic;
  color: var(--color-text);
  position: relative;
  padding: var(--space-xl) var(--space-2xl);
}

.category-intro blockquote::before {
  content: '\201C';
  font-size: 6rem;
  color: var(--color-accent);
  position: absolute;
  top: -20px;
  left: 0;
  line-height: 1;
  font-family: var(--font-display);
}

/* ---------- Related Categories ---------- */
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

/* ---------- About Page ---------- */
.about-story {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.about-story__text p {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}

.about-story__text p:first-of-type::first-letter {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 900;
  float: left;
  line-height: 0.8;
  padding-right: var(--space-sm);
  padding-top: var(--space-2xs);
  color: var(--color-accent);
}

.about-story__img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  position: sticky;
  top: calc(72px + var(--space-xl));
}

.about-philosophy {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
}

.philosophy-card {
  text-align: center;
  padding: var(--space-2xl);
}

.philosophy-card__icon {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-md);
}

.philosophy-card__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.philosophy-card__text {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.questions-list {
  max-width: var(--container-narrow);
  margin: 0 auto;
  counter-reset: question;
}

.questions-list__item {
  counter-increment: question;
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--color-border-light);
  display: flex;
  gap: var(--space-lg);
  align-items: baseline;
}

.questions-list__item::before {
  content: counter(question, decimal-leading-zero);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-accent);
  flex-shrink: 0;
}

/* ---------- Search Overlay ---------- */
.search-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 20vh;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--ease-base), visibility var(--ease-base);
}

.search-overlay.open {
  opacity: 1;
  visibility: visible;
}

.search-overlay__close {
  position: absolute;
  top: var(--space-xl);
  right: var(--space-xl);
  color: rgba(255,255,255,0.6);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--ease-fast);
}

.search-overlay__close:hover {
  color: #fff;
}

.search-overlay__input {
  width: 90%;
  max-width: 700px;
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  background: none;
  border: none;
  border-bottom: 3px solid var(--color-accent);
  color: #fff;
  padding: var(--space-md) 0;
  outline: none;
}

.search-overlay__input::placeholder {
  color: rgba(255,255,255,0.3);
}

.search-overlay__results {
  width: 90%;
  max-width: 700px;
  margin-top: var(--space-xl);
  max-height: 50vh;
  overflow-y: auto;
}

.search-result {
  display: block;
  padding: var(--space-md) 0;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  transition: padding-left var(--ease-fast);
}

.search-result:hover {
  padding-left: var(--space-md);
}

.search-result__category {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-2xs);
}

.search-result__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: #fff;
  margin-bottom: var(--space-2xs);
}

.search-result__teaser {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.6);
}

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--color-text);
  color: var(--color-bg);
  padding: var(--space-sm) var(--space-xl);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  z-index: 3000;
  opacity: 0;
  transition: transform var(--ease-spring), opacity var(--ease-base);
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ---------- Scroll Animations ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .categories-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .featured-grid {
    grid-template-columns: 1fr;
  }

  .featured-card:first-child {
    grid-row: auto;
  }

  .curiosity-grid {
    grid-template-columns: 1fr;
  }

  .about-story {
    grid-template-columns: 1fr;
  }

  .about-story__img {
    position: static;
    max-height: 400px;
    object-fit: cover;
  }

  .about-philosophy {
    grid-template-columns: 1fr;
  }

  .related-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav__links,
  .nav__actions .nav__action-btn:not(.nav__search-btn):not(.nav__theme-btn) {
    display: none;
  }

  .nav__hamburger {
    display: flex;
  }

  .hero__title {
    font-size: var(--text-4xl);
  }

  .hero__actions {
    flex-direction: column;
    align-items: center;
  }

  .categories-grid {
    grid-template-columns: 1fr;
  }

  .about-teaser {
    grid-template-columns: 1fr;
  }

  .about-teaser__img {
    height: 300px;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .footer__bottom {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }

  .newsletter__form {
    flex-direction: column;
  }

  .random-curiosity {
    padding: var(--space-xl);
  }

  .curiosity-card {
    padding: var(--space-xl);
  }

  .curiosity-card__number {
    font-size: var(--text-3xl);
  }
}

@media (max-width: 480px) {
  .hero__subtitle {
    font-size: var(--text-base);
  }

  .section {
    padding: var(--space-2xl) 0;
  }

  .container {
    padding: 0 var(--space-md);
  }
}