@import url('./assets/fonts/fonts.css');

:root {
  --bg: oklch(97% 0.012 82);
  --surface: oklch(99% 0.006 78);
  --fg: oklch(22% 0.02 50);
  --muted: oklch(45% 0.024 62);
  --border: oklch(84% 0.018 72);
  --accent: oklch(55% 0.11 42);

  --technical: oklch(48% 0.075 202);
  --technical-soft: oklch(93% 0.025 202);
  --accent-soft: oklch(94% 0.028 55);
  --placeholder: oklch(95% 0.012 76);
  --focus: oklch(45% 0.115 202);
  --shadow: 0 18px 50px oklch(22% 0.02 50 / 0.08);

  --font-display: "Noto Serif TC", "Songti TC", PMingLiU, Georgia, "Times New Roman", serif;
  --font-body: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", "Segoe UI", system-ui, sans-serif;
  --font-mono: "Cascadia Code", "SFMono-Regular", Consolas, "Liberation Mono", "Noto Sans TC", monospace;

  --space-1: 0.375rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;
  --radius-sm: 0.5rem;
  --radius-md: 0.875rem;
  --content: 74rem;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}

body {
  margin: 0;
  min-width: 20rem;
  padding-right: env(safe-area-inset-right, 0px);
  padding-left: env(safe-area-inset-left, 0px);
  color: var(--fg);
  background:
    linear-gradient(90deg, transparent 0, transparent calc(50% - 1px), oklch(84% 0.018 72 / 0.18) 50%, transparent calc(50% + 1px)),
    var(--bg);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

button,
a {
  font: inherit;
}

button {
  color: inherit;
}

a {
  color: inherit;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

::selection {
  color: var(--fg);
  background: var(--accent-soft);
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: var(--space-3);
  left: max(var(--space-3), env(safe-area-inset-left, 0px));
  padding: 0.65rem 1rem;
  color: var(--surface);
  background: var(--fg);
  border-radius: var(--radius-sm);
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: translateY(0);
}

.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;
}

.site-header {
  position: sticky;
  z-index: 10;
  top: 0;
  border-bottom: 1px solid oklch(84% 0.018 72 / 0.76);
  background: oklch(97% 0.012 82 / 0.92);
  backdrop-filter: blur(14px);
}

.site-header__inner,
.case-hero,
.case-layout,
.site-footer {
  width: min(calc(100% - clamp(2rem, 7vw, 7rem)), var(--content));
  margin-inline: auto;
}

.site-header__inner {
  display: flex;
  min-height: 4.5rem;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.site-signature {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-size: 0.82rem;
  font-weight: 650;
  letter-spacing: 0.08em;
}

.site-signature__mark {
  width: 0.65rem;
  height: 0.65rem;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 0 5px var(--accent-soft);
}

.header-actions,
.language-switcher {
  display: flex;
  align-items: center;
}

.header-actions {
  gap: var(--space-3);
}

.text-button,
.language-button,
.pagination-card {
  min-height: 44px;
  border: 0;
  cursor: pointer;
}

.text-button {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.4rem 0.6rem;
  background: transparent;
  border-radius: var(--radius-sm);
  font-weight: 650;
  text-decoration: none;
}

.text-button:hover {
  color: var(--fg);
  background: var(--surface);
}

.language-switcher {
  padding: 0.2rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
}

.language-button {
  min-width: 3rem;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: transparent;
  font-size: 0.82rem;
  font-weight: 700;
}

.language-button[aria-pressed='true'] {
  color: var(--surface);
  background: var(--fg);
}

.language-button:hover:not([aria-pressed='true']) {
  color: var(--fg);
  background: var(--accent-soft);
}

.case-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(17rem, 0.65fr);
  gap: clamp(3rem, 8vw, 8rem);
  padding-block: clamp(3.5rem, 8vw, 7rem) clamp(3rem, 7vw, 5.5rem);
  border-bottom: 1px solid var(--border);
}

.case-hero__intro {
  align-self: end;
}

.eyebrow,
.section-kicker,
.section-nav__label,
.pagination-card__label,
.content-state__label {
  margin: 0;
  font-size: 0.73rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  line-height: 1.4;
  text-transform: uppercase;
}

.eyebrow {
  color: var(--accent);
}

.platform-line {
  display: inline-flex;
  margin: var(--space-5) 0 var(--space-2);
  padding: 0.3rem 0.65rem;
  color: var(--technical);
  border: 1px solid oklch(48% 0.075 202 / 0.3);
  border-radius: 999px;
  background: var(--technical-soft);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
}

h1,
h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.035em;
  text-wrap: balance;
  overflow-wrap: anywhere;
}

h1 {
  max-width: 11ch;
  font-size: clamp(3.15rem, 7vw, 6.6rem);
  line-height: 0.96;
}

h2 {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  line-height: 1.1;
}

.hero-summary {
  max-width: 36rem;
  margin: var(--space-5) 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 1.5vw, 1.22rem);
}

.project-facts {
  align-self: end;
  margin: 0;
  border-top: 2px solid var(--fg);
}

.project-fact {
  display: grid;
  grid-template-columns: minmax(7.5rem, 0.9fr) 1.1fr;
  gap: var(--space-3);
  padding-block: var(--space-3);
  border-bottom: 1px solid var(--border);
}

.project-fact dt {
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 650;
}

.project-fact dd {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 650;
  overflow-wrap: anywhere;
}

.case-layout {
  display: grid;
  grid-template-columns: minmax(10rem, 14rem) minmax(0, 1fr);
  align-items: start;
  gap: clamp(3rem, 7vw, 7rem);
  overflow: visible;
  padding-block: clamp(3.5rem, 8vw, 7rem);
}

.section-nav {
  position: sticky;
  top: 7rem;
  align-self: start;
  max-height: calc(100vh - 8rem);
  overflow-y: auto;
  overscroll-behavior: contain;
}

.section-nav__label {
  color: var(--muted);
}

.section-nav ol {
  display: grid;
  gap: 0.2rem;
  margin: var(--space-3) 0 0;
  padding: 0;
  list-style: none;
}

.section-nav a {
  display: flex;
  min-height: 44px;
  align-items: center;
  padding: 0.5rem 0.75rem;
  color: var(--muted);
  border-left: 2px solid transparent;
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 650;
}

.section-nav a:hover,
.section-nav a[aria-current='location'] {
  color: var(--fg);
  border-left-color: var(--accent);
  background: var(--surface);
}

.mobile-section-selector {
  display: none;
}

.case-content {
  min-width: 0;
  container-type: inline-size;
}

.case-section {
  display: grid;
  grid-template-columns: minmax(13rem, 0.62fr) minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 5rem);
  padding-block: 0 clamp(4rem, 9vw, 7rem);
  scroll-margin-top: 6rem;
}

.case-section + .case-section {
  padding-top: clamp(3rem, 6vw, 5rem);
  border-top: 1px solid var(--border);
}

.case-section__heading {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.section-index {
  padding-top: 0.34rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
}

.section-kicker {
  margin-bottom: var(--space-2);
  color: var(--muted);
}

.case-section--role .section-kicker {
  color: var(--technical);
}

.case-section__body {
  min-width: 0;
}

.case-section__body > :first-child {
  margin-top: 0;
}

.case-section__body > :last-child {
  margin-bottom: 0;
}

.section-intro,
.case-copy {
  max-width: 42rem;
  margin-block: 0;
  font-size: 1.05rem;
}

.case-copy::before {
  content: '';
  display: block;
  width: 2.5rem;
  height: 2px;
  margin-bottom: var(--space-4);
  background: var(--accent);
}

.content-state {
  max-width: 42rem;
  padding: var(--space-4) var(--space-5);
  border: 1px dashed var(--border);
  border-radius: var(--radius-md);
  background: oklch(99% 0.006 78 / 0.66);
  overflow-wrap: anywhere;
}

.content-state--role {
  border-style: solid;
  background: var(--technical-soft);
}

.content-state__label {
  color: var(--accent);
}

.content-state--role .content-state__label {
  color: var(--technical);
}

.content-state h3 {
  margin: var(--space-2) 0 0;
  font-family: var(--font-display);
  font-size: 1.32rem;
  line-height: 1.25;
}

.content-state p {
  margin: var(--space-2) 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.evidence-list {
  display: grid;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.evidence-item {
  padding: var(--space-4);
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.gallery-grid {
  display: grid;
  grid-template-columns: 1.45fr 0.85fr;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.media-placeholder {
  display: flex;
  min-height: 13rem;
  align-items: flex-end;
  margin: 0;
  padding: var(--space-4);
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background:
    linear-gradient(135deg, transparent 49.6%, oklch(84% 0.018 72 / 0.72) 50%, transparent 50.4%),
    repeating-linear-gradient(90deg, transparent 0 2.9rem, oklch(84% 0.018 72 / 0.45) 3rem),
    var(--placeholder);
}

.media-placeholder:first-child {
  grid-row: span 2;
  min-height: 27rem;
}

.media-placeholder figcaption {
  padding: 0.35rem 0.6rem;
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  font-size: 0.78rem;
  font-weight: 700;
}

.media-placeholder--image {
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  padding: 0;
  overflow: hidden;
  background: var(--surface);
}

.media-placeholder--image img {
  width: 100%;
  height: 100%;
  min-height: 0;
  object-fit: cover;
}

.media-placeholder--image figcaption {
  margin: var(--space-3);
}

.technology-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0 0 var(--space-4);
  padding: 0;
  list-style: none;
}

.technology-tag {
  padding: 0.42rem 0.75rem;
  color: var(--technical);
  border: 1px solid oklch(48% 0.075 202 / 0.32);
  border-radius: 999px;
  background: var(--technical-soft);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
}

.content-state--technology {
  margin-top: var(--space-4);
}

.project-pagination {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  padding-top: clamp(2rem, 5vw, 4rem);
  border-top: 2px solid var(--fg);
}

.project-pagination--single {
  grid-template-columns: 1fr;
}

.pagination-card {
  display: grid;
  gap: var(--space-1);
  min-height: 7rem;
  padding: var(--space-4);
  text-align: left;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: none;
  color: inherit;
  text-decoration: none;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

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

.pagination-card--next {
  text-align: right;
}

.pagination-card:hover {
  color: var(--fg);
  border-color: var(--accent);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.pagination-card__label {
  color: var(--muted);
}

.pagination-card strong {
  font-family: var(--font-display);
  font-size: 1.28rem;
  overflow-wrap: anywhere;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-5);
  padding-block: var(--space-5);
  color: var(--muted);
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
}

.site-footer p {
  margin: 0;
  overflow-wrap: anywhere;
}

.footer-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
}

.footer-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--technical);
  font-weight: 700;
  text-underline-offset: 0.25rem;
  overflow-wrap: anywhere;
}

.footer-link:hover {
  color: var(--fg);
}

@container (max-width: 44rem) {
  .case-section {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }
}

@media (max-width: 64rem) {
  html {
    scroll-padding-top: 9rem;
  }

  .case-hero {
    grid-template-columns: minmax(0, 1fr) minmax(16rem, 0.72fr);
    gap: var(--space-6);
  }

  .case-layout {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .section-nav {
    position: sticky;
    z-index: 8;
    top: 4.5rem;
    max-height: none;
    padding-block: var(--space-2);
    overflow: hidden;
    border-bottom: 1px solid var(--border);
    background: oklch(97% 0.012 82 / 0.96);
    backdrop-filter: blur(14px);
  }

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

  .section-nav ol {
    display: flex;
    gap: var(--space-1);
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    scrollbar-width: thin;
    scroll-snap-type: inline proximity;
  }

  .section-nav li {
    flex: 0 0 auto;
    scroll-snap-align: start;
  }

  .section-nav a {
    white-space: nowrap;
    border-bottom: 2px solid transparent;
    border-left: 0;
  }

  .section-nav a:hover,
  .section-nav a[aria-current='location'] {
    border-bottom-color: var(--accent);
  }

  .case-section {
    scroll-margin-top: 9rem;
  }
}

@media (max-width: 46rem) {
  html {
    scroll-padding-top: 8rem;
  }

  body {
    background: var(--bg);
  }

  .site-header__inner {
    min-height: 4rem;
  }

  .site-signature span:last-child {
    display: none;
  }

  .header-actions {
    gap: var(--space-1);
  }

  .back-button {
    padding-inline: 0.4rem;
    font-size: 0.85rem;
  }

  .case-hero {
    grid-template-columns: 1fr;
    gap: var(--space-6);
    padding-top: var(--space-6);
  }

  h1 {
    max-width: 100%;
    font-size: clamp(2.75rem, 15vw, 4.5rem);
  }

  .project-fact {
    grid-template-columns: minmax(6.5rem, 0.8fr) 1.2fr;
  }

  .section-nav {
    display: none;
  }

  .case-section {
    scroll-margin-top: 8rem;
  }

  .case-section {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }

  .case-section__heading {
    max-width: 24rem;
  }

  .content-state {
    padding: var(--space-4);
  }

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

  .media-placeholder,
  .media-placeholder:first-child {
    grid-row: auto;
    min-height: 12rem;
  }

  .project-pagination {
    grid-template-columns: 1fr;
  }

  .pagination-card--next {
    text-align: left;
  }

  .site-footer {
    flex-direction: column;
    gap: var(--space-2);
  }

  .footer-actions {
    justify-content: flex-start;
  }

  .mobile-section-selector {
    position: sticky;
    top: 4rem;
    z-index: 9;
    display: block;
    padding-inline: max(var(--space-3), env(safe-area-inset-left, 0px)) max(var(--space-3), env(safe-area-inset-right, 0px));
    border-bottom: 1px solid var(--border);
    background: var(--bg);
    background: color-mix(in oklch, var(--bg) 94%, transparent);
    backdrop-filter: blur(14px);
  }

  .mobile-section-selector__trigger {
    display: grid;
    width: min(100%, var(--content));
    min-height: 52px;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: var(--space-2);
    margin-inline: auto;
    padding: 0.35rem 0;
    color: var(--fg);
    border: 0;
    border-radius: 0;
    background: transparent;
    text-align: left;
  }

  .mobile-section-selector__trigger:hover {
    color: var(--fg);
    background: var(--accent-soft);
  }

  .mobile-section-selector__label {
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }

  .mobile-section-selector__current {
    min-width: 0;
    font-family: var(--font-display);
    font-size: 0.96rem;
    font-weight: 650;
    text-align: right;
    overflow-wrap: anywhere;
  }

  .mobile-section-selector__chevron {
    width: 0.55rem;
    height: 0.55rem;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: rotate(45deg) translateY(-0.1rem);
    transform-origin: center;
    transition: transform 160ms ease;
  }

  .mobile-section-selector__trigger[aria-expanded='true'] .mobile-section-selector__chevron {
    transform: rotate(225deg) translate(-0.1rem, -0.1rem);
  }

  .mobile-section-dropdown {
    width: min(100%, var(--content));
    max-height: min(50dvh, 24rem);
    margin-inline: auto;
    padding: var(--space-2) 0 var(--space-3);
    overflow-y: auto;
    overscroll-behavior: contain;
    border-top: 1px solid var(--border);
    background: var(--bg);
  }

  .mobile-section-nav ol {
    display: grid;
    gap: var(--space-1);
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .mobile-section-nav a {
    display: flex;
    min-height: 44px;
    align-items: center;
    padding: 0.55rem var(--space-2) 0.55rem var(--space-3);
    border-left: 2px solid transparent;
    color: var(--muted);
    font-size: 0.9rem;
    font-weight: 650;
    text-decoration: none;
    overflow-wrap: anywhere;
  }

  .mobile-section-nav a:hover,
  .mobile-section-nav a[aria-current='location'] {
    color: var(--fg);
    border-left-color: var(--accent);
    background: var(--accent-soft);
  }
}

@media (max-width: 23rem) {
  .language-button {
    min-width: 2.75rem;
    padding-inline: 0.5rem;
  }

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

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}