/* ============================================================
   THE LANTERN FOUNDATION · 天燈之夢
   Shared Styles — Bold, impactful design
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,600;0,700;0,900;1,400&family=DM+Sans:opsz,wght@9..40,300;9..40,400;9..40,500;9..40,600&display=swap');

/* ---- RESET ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
ul { list-style: none; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
button { font-family: inherit; }

/* ---- TOKENS ---- */
:root {
  --dark:         #0B0A08;
  --dark-2:       #141210;
  --dark-3:       #221D17;
  --dark-card:    #1B1710;
  --gold:         #BF880C;
  --gold-bright:  #E8A420;
  --gold-pale:    #F5C84A;
  --cream:        #F8F3E9;
  --cream-2:      #EBE3CF;
  --text-light:   #E0D4BB;
  --text-muted:   #857866;
  --text-dim:     #4C4333;
  --text-dark:    #15110C;
  --text-body:    #38300A;

  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans:  'DM Sans', system-ui, -apple-system, sans-serif;

  --container: 1200px;
  --nav-h: 72px;
  --section-v: clamp(5rem, 10vw, 9rem);
  --gap: clamp(1.5rem, 5vw, 3rem);
}

/* ---- BASE ---- */
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-light);
  background: var(--dark);
  -webkit-font-smoothing: antialiased;
  text-wrap: pretty;
}

/* ---- TYPOGRAPHY SCALES ---- */
.t-display {
  font-family: var(--font-serif);
  font-size: clamp(2.8rem, 5.5vw, 5.2rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
}
.t-h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 4vw, 3.8rem);
  font-weight: 700;
  line-height: 1.15;
}
.t-h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.65rem, 3vw, 2.6rem);
  font-weight: 600;
  line-height: 1.2;
}
.t-h3 {
  font-family: var(--font-serif);
  font-size: clamp(1.2rem, 2vw, 1.65rem);
  font-weight: 600;
  line-height: 1.25;
}
.t-label {
  font-family: var(--font-sans);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold-bright);
}
.t-lead {
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  line-height: 1.7;
  color: var(--text-muted);
}

/* ---- LAYOUT ---- */
.wrap {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gap);
}
section { padding-block: var(--section-v); }

/* ---- BUTTONS ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 0.9em 2em;
  cursor: pointer;
  text-decoration: none;
  border: 2px solid transparent;
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.15s;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: none; }

.btn-gold { background: var(--gold-bright); color: var(--dark); border-color: var(--gold-bright); }
.btn-gold:hover { background: var(--gold-pale); border-color: var(--gold-pale); }

.btn-outline { background: transparent; color: var(--text-light); border-color: rgba(224,212,187,0.35); }
.btn-outline:hover { background: rgba(224,212,187,0.08); border-color: var(--text-light); }

.btn-outline-gold { background: transparent; color: var(--gold-bright); border-color: var(--gold-bright); }
.btn-outline-gold:hover { background: var(--gold-bright); color: var(--dark); }

.btn-outline-dark { background: transparent; color: var(--text-dark); border-color: rgba(21,17,12,0.4); }
.btn-outline-dark:hover { background: var(--text-dark); color: var(--cream); }

.btn-sm { padding: 0.65em 1.4em; font-size: 0.8rem; }

/* ---- GOLD DIVIDER ---- */
.gold-bar {
  display: block;
  width: 40px;
  height: 2px;
  background: var(--gold-bright);
  margin-bottom: 1.5rem;
}

/* ---- NAVIGATION ---- */
.site-nav {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 200;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background 0.35s, backdrop-filter 0.35s, box-shadow 0.35s;
}
.site-nav.scrolled {
  background: rgba(11,10,8,0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(191,136,12,0.2);
}
.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gap);
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  flex-shrink: 0;
}
.nav-logo-words { display: flex; flex-direction: column; line-height: 1.1; }
.nav-logo-words strong {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--cream);
  letter-spacing: 0.01em;
  white-space: nowrap;
}
.nav-logo-words em {
  font-style: normal;
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  color: var(--gold-bright);
  text-transform: uppercase;
}

/* Links */
.nav-items {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}
.nav-items > li { position: relative; }

.nav-items a, .nav-dd-btn {
  font-size: 0.875rem;
  font-weight: 500;
  color: rgba(224,212,187,0.8);
  text-decoration: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.2rem 0;
  transition: color 0.2s;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.nav-items a:hover, .nav-dd-btn:hover { color: var(--gold-bright); }
.nav-items a.current { color: var(--gold-bright); }

/* Dropdown */
.nav-dd { position: relative; }
.nav-dd-btn { display: flex; align-items: center; gap: 0.3rem; }
.nav-dd-btn svg { width: 10px; height: 10px; transition: transform 0.2s; }
.nav-dd.open .nav-dd-btn svg { transform: rotate(180deg); }

.nav-dd-panel {
  position: absolute;
  top: calc(100% + 16px);
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  min-width: 180px;
  background: var(--dark-2);
  border: 1px solid var(--dark-3);
  border-top: 2px solid var(--gold);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
}
.nav-dd.open .nav-dd-panel {
  opacity: 1;
  visibility: visible;
  pointer-events: all;
  transform: translateX(-50%) translateY(0);
}
.nav-dd-panel a {
  display: block;
  padding: 0.65rem 1.1rem;
  font-size: 0.84rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.nav-dd-panel a:last-child { border-bottom: none; }
.nav-dd-panel a:hover { background: var(--dark-3); color: var(--cream); }

/* End / CTA */
.nav-end { display: flex; align-items: center; gap: 1rem; }

/* Hamburger */
.nav-ham {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  z-index: 201;
}
.nav-ham span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--cream);
  transition: transform 0.3s, opacity 0.25s;
  transform-origin: center;
}
.nav-ham.open span:first-child  { transform: translateY(7px) rotate(45deg); }
.nav-ham.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-ham.open span:last-child   { transform: translateY(-7px) rotate(-45deg); }

/* Mobile overlay */
.nav-mob {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--dark);
  z-index: 199;
  padding: var(--nav-h) var(--gap) var(--gap);
  overflow-y: auto;
  opacity: 0;
  transition: opacity 0.3s;
}
.nav-mob.open { opacity: 1; }

.nav-mob-list {
  padding-top: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}
.nav-mob-list > li > a,
.nav-mob-list > li > span {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 5vw, 2.4rem);
  font-weight: 600;
  color: var(--cream);
  text-decoration: none;
  display: block;
  padding: 0.4rem 0;
  transition: color 0.2s;
}
.nav-mob-list > li > a:hover,
.nav-mob-list > li > span:hover { color: var(--gold-bright); }

.nav-mob-sub {
  padding-left: 1rem;
  border-left: 2px solid var(--dark-3);
  margin-bottom: 0.5rem;
}
.nav-mob-sub a {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--text-muted);
  text-decoration: none;
  display: block;
  padding: 0.3rem 0;
  transition: color 0.2s;
}
.nav-mob-sub a:hover { color: var(--gold-bright); }

.nav-mob-footer {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--dark-3);
}

/* ---- FOOTER ---- */
.site-footer {
  background: var(--dark-2);
  border-top: 1px solid var(--dark-3);
}
.footer-body {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  padding-block: 4rem 3rem;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gap);
}
.foot-brand-logo {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  margin-bottom: 1.1rem;
}
.foot-brand-logo strong {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--cream);
}
.foot-brand p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.65;
  max-width: 32ch;
}
.foot-brand-cn {
  display: block;
  margin-top: 0.6rem;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--text-dim);
}
.foot-col h4 {
  font-family: var(--font-sans);
  font-size: 0.67rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 1.25rem;
}
.foot-col ul { display: flex; flex-direction: column; gap: 0.7rem; }
.foot-col ul a {
  font-size: 0.875rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}
.foot-col ul a:hover { color: var(--cream); }
.foot-email {
  display: block;
  font-size: 0.875rem;
  color: var(--text-muted);
  text-decoration: none;
  margin-bottom: 1.5rem;
  transition: color 0.2s;
  word-break: break-all;
}
.foot-email:hover { color: var(--gold-bright); }
.foot-social { display: flex; gap: 0.6rem; }
.foot-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--dark-3);
  color: var(--text-muted);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
}
.foot-social a:hover { background: var(--gold-bright); color: var(--dark); }

.footer-bottom {
  border-top: 1px solid var(--dark-3);
  padding-block: 1.5rem;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gap);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.footer-bottom p {
  font-size: 0.7rem;
  color: var(--text-dim);
  letter-spacing: 0.08em;
}

/* ---- SCROLL REVEAL ---- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: 0.1s; }
.reveal.d2 { transition-delay: 0.22s; }
.reveal.d3 { transition-delay: 0.36s; }
.reveal.d4 { transition-delay: 0.5s; }

/* ---- PAGE HERO BASE ---- */
.page-hero {
  padding-top: calc(var(--nav-h) + clamp(3.5rem, 8vw, 6rem));
  padding-bottom: clamp(4rem, 8vw, 7rem);
  background: var(--dark);
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 55% 55% at 50% 0%, rgba(191,136,12,0.08) 0%, transparent 70%);
  pointer-events: none;
}

/* ---- CARD BASE ---- */
.card {
  background: var(--dark-card);
  border: 1px solid rgba(255,255,255,0.04);
  transition: border-color 0.25s, transform 0.25s;
}
.card:hover { border-color: rgba(191,136,12,0.3); transform: translateY(-3px); }

/* ---- SURFACE HELPERS ---- */
.bg-dark   { background: var(--dark); }
.bg-dark-2 { background: var(--dark-2); }
.bg-cream  { background: var(--cream); color: var(--text-dark); }

.on-cream .t-label { color: var(--gold); }
.on-cream p { color: var(--text-body); }
.on-cream h1, .on-cream h2, .on-cream h3 { color: var(--text-dark); font-family: var(--font-serif); }

/* ---- RESPONSIVE ---- */
@media (max-width: 1024px) {
  .footer-body { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 980px) {
  .nav-items, .nav-end .btn-nav-cta { display: none; }
  .nav-ham { display: flex; }
  .nav-mob { display: block; }
}
@media (max-width: 768px) {
  :root { --section-v: clamp(3.5rem, 8vw, 5.5rem); }
  .footer-body { grid-template-columns: 1fr; gap: 2rem; }
  .footer-bottom { flex-direction: column; text-align: center; }
}