/* Tokyo Uncovered — Design System */

:root {
  --color-bg: #f8f4ef;
  --color-text: #1a1208;
  --color-accent: #C41E1E;
  --color-overlay: rgba(26, 18, 8, 0.55);
  --color-border: rgba(26, 18, 8, 0.12);
  --color-muted: rgba(26, 18, 8, 0.65);
  --font-heading: "Shippori Mincho", Georgia, serif;
  --font-body: "Noto Sans JP", system-ui, sans-serif;
  --header-height: 5.5rem;
  --utility-height: 2.25rem;
  --total-header: calc(var(--header-height) + var(--utility-height));
  --section-gap: clamp(5rem, 10vw, 10rem);
  --content-width: 72rem;
  --transition-slow: 600ms ease-out;
  --transition-medium: 400ms ease-out;
}

[data-theme="dark"] {
  --color-bg: #1a1208;
  --color-text: #f4e8d0;
  --color-accent: #C41E1E;
  --color-overlay: rgba(26, 18, 8, 0.65);
  --color-border: rgba(244, 232, 208, 0.12);
  --color-muted: rgba(244, 232, 208, 0.65);
}

/* Reset & Base */

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

html {
  scroll-behavior: smooth;
  font-size: 100%;
}

body {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 1.0625rem;
  line-height: 1.75;
  letter-spacing: 0.01em;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

ul,
ol {
  list-style: none;
}

/* Typography */

h1,
h2,
h3 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: 0.02em;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
}

h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  margin-bottom: 1.5rem;
}

h2::after {
  content: "";
  display: block;
  width: 3rem;
  height: 1px;
  background-color: var(--color-accent);
  margin-top: 1rem;
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  margin-top: 2rem;
  margin-bottom: 1rem;
}

p {
  margin-bottom: 1.25rem;
}

p:last-child {
  margin-bottom: 0;
}

em,
i {
  font-style: italic;
}

blockquote,
.pull-quote {
  font-family: var(--font-heading);
  font-size: clamp(1.25rem, 2.5vw, 1.625rem);
  font-style: italic;
  line-height: 1.5;
  letter-spacing: 0.02em;
  border-left: 1px solid var(--color-accent);
  padding-left: 1.5rem;
  margin: 0;
}

/* Layout */

.container {
  width: min(100% - 2.5rem, var(--content-width));
  margin-inline: auto;
}

.section {
  padding-block: var(--section-gap);
  scroll-margin-top: var(--total-header);
}

.section-divider {
  border: none;
  border-top: 1px solid var(--color-accent);
  width: min(100% - 2.5rem, var(--content-width));
  margin-inline: auto;
}

/* Header */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background-color: var(--color-bg);
  transition: border-color var(--transition-medium);
}

.site-header.is-scrolled {
  border-bottom: 1px solid var(--color-border);
}

.utility-bar {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 1.25rem;
  height: var(--utility-height);
  padding-inline: 1.25rem;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.8125rem;
  font-weight: 400;
  letter-spacing: 0.04em;
}

.utility-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: color var(--transition-medium);
}

.utility-link svg {
  width: 1rem;
  height: 1rem;
  fill: currentColor;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  transition: color var(--transition-medium);
}

.theme-toggle:focus-visible,
.utility-link:focus-visible,
.nav-link:focus-visible,
.btn:focus-visible,
.menu-toggle:focus-visible,
.site-logo:focus-visible,
.footer-link:focus-visible,
details summary:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  width: 1.125rem;
  height: 1.125rem;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.5;
}

.theme-toggle .icon-moon {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-moon {
  display: block;
}

.main-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding-inline: 1.25rem;
}

.site-logo img {
  height: 3rem;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  position: relative;
  transition: color var(--transition-medium);
}

.nav-link.is-active {
  color: var(--color-accent);
}

.nav-link.is-active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.35rem;
  height: 1px;
  background-color: var(--color-accent);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2rem;
  height: 2rem;
  padding: 0.25rem;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 1px;
  background-color: var(--color-text);
  transition: transform var(--transition-medium), opacity var(--transition-medium);
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.mobile-utility {
  display: none;
}

/* Hero */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: var(--total-header);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-color: var(--color-overlay);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(100% - 2.5rem, 48rem);
  color: #f4e8d0;
}

.hero-content h1 {
  margin-bottom: 1.25rem;
}

.hero-subtext {
  font-family: var(--font-heading);
  font-size: clamp(1.125rem, 2.5vw, 1.5rem);
  font-style: italic;
  font-weight: 400;
  margin-bottom: 2.5rem;
  opacity: 0.9;
}

.hero-content h2.hero-subtext {
  font-size: clamp(1.125rem, 2.5vw, 1.375rem);
}

/* Buttons */

.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  border: 1px solid #f4e8d0;
  color: #f4e8d0;
  transition: background-color var(--transition-medium), color var(--transition-medium), border-color var(--transition-medium);
}

.btn:hover {
  background-color: #f4e8d0;
  color: var(--color-text);
  border-color: #f4e8d0;
}

/* Split sections */

.split-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
}

.split-section--reverse .split-section__image {
  order: -1;
}

.split-section__text {
  max-width: 36rem;
}

.split-section__image img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* Scroll reveals */

.reveal {
  opacity: 0;
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.reveal--fade-up {
  transform: translateY(2rem);
}

.reveal--slide-right {
  transform: translateX(2.5rem);
}

.reveal--slide-left {
  transform: translateX(-2.5rem);
}

.reveal.is-visible {
  opacity: 1;
  transform: translate(0, 0);
}

/* About banner */

.about-banner img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  margin-bottom: clamp(2rem, 4vw, 3.5rem);
}

/* Tour highlights */

.highlights-list {
  max-width: 40rem;
}

.highlights-list li {
  padding-block: 1.25rem;
  border-bottom: 1px solid var(--color-accent);
}

.highlights-list li:first-child {
  border-top: 1px solid var(--color-accent);
}

.highlights-list strong {
  font-weight: 500;
}

/* FAQ Accordion */

.faq-list {
  max-width: 48rem;
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
}

.faq-item:first-child {
  border-top: 1px solid var(--color-border);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1.25rem;
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  font-family: var(--font-body);
  font-size: 1.25rem;
  font-weight: 300;
  color: var(--color-accent);
  flex-shrink: 0;
  transition: transform var(--transition-medium);
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item .faq-answer {
  padding-bottom: 1.25rem;
  padding-right: 2rem;
  color: var(--color-muted);
}

/* Footer */

.site-footer {
  padding-block: 3rem 2.5rem;
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.footer-logo img {
  height: 1.75rem;
  width: auto;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.875rem;
}

.footer-link {
  transition: color var(--transition-medium);
}

.footer-link svg {
  width: 1rem;
  height: 1rem;
  fill: currentColor;
  vertical-align: middle;
  margin-right: 0.35rem;
}

.copyright {
  width: 100%;
  font-size: 0.8125rem;
  color: var(--color-muted);
  margin-top: 0.5rem;
}

/* Responsive */

@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: var(--total-header);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 1.25rem 1.5rem;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform var(--transition-medium), opacity var(--transition-medium), visibility var(--transition-medium);
  }

  .nav-links.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-link {
    padding-block: 0.875rem;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-link.is-active::after {
    display: none;
  }

  .split-section,
  .split-section--reverse {
    grid-template-columns: 1fr;
  }

  .split-section--reverse .split-section__image {
    order: 0;
  }

  .mobile-utility {
    display: none;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}