/* ==========================================================================
   誠議 RST — Design tokens
   ========================================================================== */
:root {
  /* Color — derived from brand logo (navy circle/wordmark + terracotta RST) */
  --navy-900: #12193B;
  --navy-700: #1E2A5E;
  --navy-500: #3A4B8C;
  --navy-300: #7986B8;
  --navy-100: #E7E9F3;

  --ember-600: #B34A2C;
  --ember-500: #D9683F;
  --ember-300: #F0B79C;
  --ember-100: #FBEAE1;

  --paper: #FAFAF8;
  --paper-dim: #F1F0EC;
  --ink: #171A2B;
  --ink-soft: #4A4C5C;
  --ink-faint: #71738C;
  --line: rgba(30, 42, 94, 0.14);
  --line-on-navy: rgba(255, 255, 255, 0.18);

  /* Type */
  --font-display: 'Bricolage Grotesque', 'Noto Sans TC', sans-serif;
  --font-cjk: 'Noto Sans TC', sans-serif;
  --font-body: 'Noto Sans TC', 'Bricolage Grotesque', sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;

  --fs-hero: clamp(2.4rem, 3.4vw + 1.3rem, 4.2rem);
  --fs-h2: clamp(1.9rem, 1.8vw + 1.2rem, 2.9rem);
  --fs-h3: clamp(1.3rem, 0.8vw + 1rem, 1.6rem);
  --fs-lede: clamp(1.05rem, 0.4vw + 0.9rem, 1.25rem);
  --fs-body: clamp(1rem, 0.15vw + 0.92rem, 1.08rem);
  --fs-meta: 0.78rem;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.75rem;
  --space-4: 2.75rem;
  --space-5: 4.5rem;
  --space-6: 7rem;

  --radius-sm: 10px;
  --radius-md: 22px;
  --radius-lg: 40px;
  --radius-pill: 999px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ==========================================================================
   Reset
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, p { margin: 0; }
button { font: inherit; background: none; border: none; cursor: pointer; color: inherit; }

:focus-visible {
  outline: 2.5px solid var(--ember-600);
  outline-offset: 3px;
  border-radius: 4px;
}

.wrap {
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: var(--space-3);
}

@media (min-width: 720px) {
  .wrap { padding-inline: var(--space-4); }
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ember-600);
}

.eyebrow-mark {
  display: inline-block;
  width: 0.9em;
  height: 0.9em;
  position: relative;
  flex-shrink: 0;
}
.eyebrow-mark::before,
.eyebrow-mark::after {
  content: "";
  position: absolute;
  background: currentColor;
}
.eyebrow-mark::before { left: 50%; top: 0; width: 1.5px; height: 100%; transform: translateX(-50%); }
.eyebrow-mark::after { top: 50%; left: 0; height: 1.5px; width: 100%; transform: translateY(-50%); }

.eyebrow--on-navy { color: var(--ember-500); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  padding: 0.95em 1.7em;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.92rem;
  letter-spacing: 0.02em;
  transition: transform 0.35s var(--ease), background 0.25s var(--ease), color 0.25s var(--ease), box-shadow 0.25s var(--ease);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn-arrow { transition: transform 0.35s var(--ease); }
.btn:hover .btn-arrow { transform: translateX(4px); }

.btn--filled {
  background: var(--ember-600);
  color: var(--paper);
  box-shadow: 0 10px 24px -12px rgba(204, 82, 51, 0.55);
}
.btn--filled:hover { background: var(--navy-700); box-shadow: 0 10px 24px -12px rgba(30, 42, 94, 0.5); }

.btn--outline {
  border: 1.5px solid var(--line);
  color: var(--navy-700);
}
.btn--outline:hover { border-color: var(--navy-700); background: var(--navy-100); }

.btn--outline-on-navy {
  border: 1.5px solid var(--line-on-navy);
  color: var(--paper);
}
.btn--outline-on-navy:hover { border-color: var(--paper); background: rgba(255,255,255,0.08); }

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ==========================================================================
   Nav
   ========================================================================== */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 250, 248, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.site-nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-2);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65em;
}
.brand img { height: 68px; width: auto; }
.brand-name {
  font-family: var(--font-cjk);
  font-weight: 900;
  font-size: 1.15rem;
  color: var(--navy-900);
  letter-spacing: 0.02em;
}
.brand-name small {
  display: block;
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  margin-top: 2px;
}

.nav-links {
  display: none;
  align-items: center;
  gap: var(--space-4);
  font-size: 0.95rem;
  color: var(--ink-soft);
}
.nav-links a { position: relative; padding-block: 4px; }
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: 0;
  height: 1.5px;
  background: var(--ember-600);
  transition: right 0.3s var(--ease);
}
.nav-links a:hover { color: var(--navy-900); }
.nav-links a:hover::after { right: 0; }

.nav-cta { display: none; }

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.nav-toggle span {
  width: 22px;
  height: 1.5px;
  background: var(--navy-900);
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

.mobile-panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.4s var(--ease);
  border-bottom: 1px solid transparent;
}
.mobile-panel.is-open { grid-template-rows: 1fr; border-bottom-color: var(--line); }
.mobile-panel-inner { overflow: hidden; }
.mobile-panel .wrap {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding-block: var(--space-2) var(--space-3);
  font-size: 1.05rem;
}
.mobile-panel a { padding-block: 0.4em; color: var(--navy-900); }

@media (min-width: 960px) {
  .nav-links { display: flex; }
  .nav-cta { display: inline-flex; }
  .nav-toggle { display: none; }
  .mobile-panel { display: none; }
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  padding-block: var(--space-6) var(--space-5);
  overflow: hidden;
}

.hero .wrap {
  display: grid;
  gap: var(--space-5);
  align-items: center;
}

.hero-copy { position: relative; z-index: 2; }

.hero-eyebrow { margin-bottom: var(--space-3); }

.hero-title {
  font-family: var(--font-cjk);
  font-weight: 900;
  font-size: var(--fs-hero);
  line-height: 1.22;
  color: var(--navy-900);
  letter-spacing: -0.01em;
}

.hero-title em {
  font-style: normal;
  color: var(--ember-600);
}

.hero-sub {
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--navy-500);
  letter-spacing: 0.01em;
}

.hero-lede {
  margin-top: var(--space-3);
  max-width: 40ch;
  font-size: var(--fs-lede);
  color: var(--ink-soft);
}

.hero-actions {
  margin-top: var(--space-4);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.hero-visual {
  position: relative;
  min-height: 320px;
}

.hero-visual svg { width: 100%; height: auto; }

.ribbon-path {
  stroke-dasharray: 900;
  stroke-dashoffset: 900;
  animation: draw-ribbon 2.2s var(--ease) 0.3s forwards;
}
@keyframes draw-ribbon {
  to { stroke-dashoffset: 0; }
}

.float-slow { animation: float-y 7s ease-in-out infinite; }
.float-slower { animation: float-y 9s ease-in-out infinite 0.6s; }
@keyframes float-y {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@media (min-width: 960px) {
  .hero .wrap { grid-template-columns: 1.05fr 0.95fr; }
}

/* ==========================================================================
   Ticker
   ========================================================================== */
.ticker {
  background: var(--navy-900);
  color: var(--ember-300);
  overflow: hidden;
  border-block: 1px solid var(--line-on-navy);
}
.ticker-track {
  display: flex;
  width: max-content;
  animation: ticker-scroll 48s linear infinite;
}
.ticker-track span {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding-block: var(--space-2);
  padding-inline: var(--space-3);
  white-space: nowrap;
}
.ticker-track span.ticker-sep {
  padding-inline: 0;
  opacity: 0.5;
}
@keyframes ticker-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ==========================================================================
   Section shell
   ========================================================================== */
.section { padding-block: var(--space-6); }
.section-head {
  max-width: 62ch;
  margin-bottom: var(--space-5);
}
.section-head h2 {
  margin-top: var(--space-2);
  font-family: var(--font-cjk);
  font-weight: 900;
  font-size: var(--fs-h2);
  color: var(--navy-900);
  line-height: 1.3;
}
.section-head p {
  margin-top: var(--space-2);
  color: var(--ink-soft);
  font-size: var(--fs-lede);
  max-width: 52ch;
}

/* ==========================================================================
   Services — editorial index
   ========================================================================== */
.index-list { border-top: 1px solid var(--line); }

.index-row {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-2) var(--space-3);
  align-items: start;
  padding-block: var(--space-3);
  border-bottom: 1px solid var(--line);
  position: relative;
}

.index-folio {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--ember-600);
  padding-top: 0.35em;
}

.index-body h3 {
  font-family: var(--font-cjk);
  font-weight: 700;
  font-size: var(--fs-h3);
  color: var(--navy-900);
  display: flex;
  flex-wrap: wrap;
  gap: 0.6em;
  align-items: baseline;
}
.index-body h3 .en {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  text-transform: uppercase;
}
.index-body p {
  margin-top: 0.55em;
  color: var(--ink-soft);
  max-width: 56ch;
}

.index-row-link {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-sm);
}

.index-thumb {
  display: none;
  position: absolute;
  right: 0;
  top: 50%;
  width: 190px;
  height: 130px;
  border-radius: var(--radius-md);
  transform: translateY(-50%) translateX(10px) scale(0.96);
  opacity: 0;
  transition: opacity 0.4s var(--ease), transform 0.4s var(--ease);
  pointer-events: none;
  overflow: hidden;
}
.index-row:hover .index-thumb {
  opacity: 1;
  transform: translateY(-50%) translateX(0) scale(1);
}

@media (min-width: 720px) {
  .index-row { grid-template-columns: 90px 1fr; padding-block: var(--space-4); }
  .index-folio { font-size: 1.05rem; }
  .index-thumb { display: block; }
}

/* ==========================================================================
   Process — connected rail on navy
   ========================================================================== */
.process {
  background: var(--navy-900);
  color: var(--paper);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-3);
  position: relative;
  overflow: hidden;
}
@media (min-width: 720px) { .process { padding: var(--space-5) var(--space-4); } }

.process .section-head h2,
.process .section-head p { color: var(--paper); }
.process .section-head p { color: var(--navy-300); }

.rail {
  position: relative;
  display: grid;
  gap: var(--space-4);
  counter-reset: step;
}

.rail::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 8px;
  bottom: 8px;
  width: 1.5px;
  background: var(--line-on-navy);
}

@media (min-width: 900px) {
  .rail { grid-template-columns: repeat(4, 1fr); gap: var(--space-3); }
  .rail::before { left: 0; right: 0; top: 13px; bottom: auto; height: 1.5px; width: auto; }
}

.rail-step { position: relative; padding-left: var(--space-4); }
@media (min-width: 900px) { .rail-step { padding-left: 0; padding-top: var(--space-4); } }

.rail-node {
  counter-increment: step;
  position: absolute;
  left: 0; top: 2px;
  width: 27px; height: 27px;
  border-radius: 50%;
  border: 1.5px solid var(--ember-500);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--navy-900);
}
.rail-node::before { content: counter(step); }
@media (min-width: 900px) { .rail-node { left: 0; top: 0; } }

.rail-step h3 {
  font-family: var(--font-cjk);
  font-weight: 700;
  font-size: 1.2rem;
  margin-bottom: 0.4em;
}
.rail-step h3 span {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 0.7rem;
  color: var(--navy-300);
  display: block;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.3em;
}
.rail-step p { color: var(--navy-300); font-size: 0.95rem; max-width: 30ch; }

/* ==========================================================================
   Work — masonry-ish teaser
   ========================================================================== */
.work-grid {
  display: grid;
  gap: var(--space-3);
}
@media (min-width: 720px) {
  .work-grid { grid-template-columns: repeat(3, 1fr); }
  .work-grid > :nth-child(1) { grid-column: span 2; }
}

.work-card {
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--navy-700);
  position: relative;
  aspect-ratio: 4 / 3;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-3);
  color: var(--paper);
}
.work-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
}
.work-card--a::before {
  background-image: linear-gradient(180deg, rgba(18, 25, 59, 0.1), rgba(18, 25, 59, 0.85)), url("assets/work/work-a.jpg");
}
.work-card--b::before {
  background-image: linear-gradient(180deg, rgba(18, 25, 59, 0.1), rgba(18, 25, 59, 0.85)), url("assets/work/work-b.jpg");
}
.work-card--c::before {
  background-image: linear-gradient(180deg, rgba(18, 25, 59, 0.1), rgba(18, 25, 59, 0.85)), url("assets/work/work-c.jpg");
}
.work-card--d::before {
  background-image: linear-gradient(180deg, rgba(18, 25, 59, 0.1), rgba(18, 25, 59, 0.85)), url("assets/work/work-d.jpg");
}

.work-tag {
  position: relative;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.75;
  margin-bottom: 0.5em;
}
.work-card h3 {
  position: relative;
  font-family: var(--font-cjk);
  font-weight: 700;
  font-size: 1.25rem;
}

.work-more { margin-top: var(--space-4); text-align: center; }

/* ==========================================================================
   About — pull quote
   ========================================================================== */
.about .wrap {
  display: grid;
  gap: var(--space-4);
}
@media (min-width: 900px) {
  .about .wrap { grid-template-columns: 1fr 1fr; align-items: center; }
}

.about-quote {
  font-family: var(--font-cjk);
  font-weight: 700;
  font-size: clamp(1.4rem, 1.6vw + 1rem, 2.1rem);
  line-height: 1.5;
  color: var(--navy-900);
}
.about-quote em {
  font-style: normal;
  color: var(--ember-600);
}

.about-side p {
  color: var(--ink-soft);
  margin-bottom: var(--space-3);
}

.signature-line {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-style: italic;
  font-size: 0.92rem;
  color: var(--ink-faint);
}
.signature-line strong { color: var(--ember-600); font-style: normal; }

/* ==========================================================================
   CTA
   ========================================================================== */
.cta {
  background: var(--navy-900);
  color: var(--paper);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-3);
  position: relative;
  overflow: hidden;
  text-align: center;
}
@media (min-width: 720px) { .cta { padding: var(--space-5) var(--space-4); } }

.cta .eyebrow { justify-content: center; }
.cta h2 {
  margin-top: var(--space-2);
  font-family: var(--font-cjk);
  font-weight: 900;
  font-size: var(--fs-h2);
  max-width: 18ch;
  margin-inline: auto;
}
.cta p {
  margin-top: var(--space-2);
  color: var(--navy-300);
  max-width: 46ch;
  margin-inline: auto;
}
.cta-actions {
  margin-top: var(--space-4);
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.cta-contact {
  margin-top: var(--space-4);
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--navy-300);
}
.cta-contact a:hover { color: var(--paper); }

/* ==========================================================================
   Footer
   ========================================================================== */
.footer { padding-block: var(--space-5) var(--space-4); border-top: 1px solid var(--line); }
.footer-grid {
  display: grid;
  gap: var(--space-4);
}
@media (min-width: 900px) {
  .footer-grid { grid-template-columns: 1.3fr 1fr 1fr; }
}

.footer-brand .brand { margin-bottom: var(--space-2); }
.footer-brand p {
  color: var(--ink-faint);
  font-size: 0.88rem;
  max-width: 34ch;
}

.footer-heading {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: var(--space-2);
}
.footer-links li { margin-bottom: 0.6em; }
.footer-links a:hover { color: var(--ember-600); }

/* ==========================================================================
   Back to top
   ========================================================================== */
.back-to-top {
  position: fixed;
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--ember-600);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  box-shadow: 0 10px 24px -12px rgba(204, 82, 51, 0.55);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.25s ease, transform 0.25s ease, background 0.2s ease, box-shadow 0.2s ease;
}
.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--navy-700);
  box-shadow: 0 10px 24px -12px rgba(30, 42, 94, 0.5);
}
@media (prefers-reduced-motion: reduce) {
  .back-to-top { transition: opacity 0.15s linear; }
}

.footer-bottom {
  margin-top: var(--space-5);
  padding-top: var(--space-3);
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-faint);
}
.footer-signature strong { color: var(--ember-600); }