/* ============================================================
   GPF Hong Kong · Core layout, chrome & CMS
   ============================================================ */

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

html {
  scroll-behavior: smooth;
  background: var(--bg-0);
  transition: background 0.5s var(--ease);
  scroll-padding-top: 90px;
}

body {
  background: transparent;
  color: var(--text-0);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-size: var(--fs-body);
  line-height: 1.7;
  font-weight: 400;
  overflow-x: hidden;
  min-height: 100vh;
  transition: color 0.5s var(--ease);
}

img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: transparent; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
::selection { background: var(--brand-cyan); color: #001018; }

:focus-visible {
  outline: 2px solid var(--brand-cyan-bright);
  outline-offset: 3px;
  border-radius: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
  html { scroll-behavior: auto; }
}

/* ============================================================
   VIDEO BACKGROUND STAGE
   ============================================================ */
.bg-stage {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background: radial-gradient(ellipse at 30% 18%, #0a1e30 0%, #04080f 55%, #020508 100%);
  transition: background 0.5s var(--ease);
}
[data-theme="light"] .bg-stage {
  background: radial-gradient(ellipse at 30% 18%, #E8F3FB 0%, #F4F7FB 55%, #EEF3F9 100%);
}
.bg-stage video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: var(--video-opacity);
  filter: var(--video-filter);
  transform: scale(1.02);
  transition: opacity 0.6s var(--ease), filter 0.6s var(--ease);
}
/* Tint/vignette overlay — NO backdrop-filter so the video stays sharp */
.bg-stage::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 82% 8%, rgba(0, 163, 224, 0.18) 0%, transparent 45%),
    radial-gradient(ellipse at 8% 82%, rgba(124, 240, 210, 0.12) 0%, transparent 50%),
    linear-gradient(180deg, rgba(4, 8, 15, 0.14) 0%, rgba(4, 8, 15, 0.50) 55%, rgba(4, 8, 15, 0.80) 100%);
  pointer-events: none;
}
[data-theme="light"] .bg-stage::after {
  background:
    radial-gradient(ellipse at 82% 8%, rgba(0, 163, 224, 0.12) 0%, transparent 45%),
    radial-gradient(ellipse at 8% 82%, rgba(14, 143, 115, 0.08) 0%, transparent 50%),
    linear-gradient(180deg, rgba(244, 247, 251, 0.30) 0%, rgba(244, 247, 251, 0.58) 60%, rgba(244, 247, 251, 0.76) 100%);
}

/* SVG subpixel grain overlay */
.bg-grain {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.5;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.8  0 0 0 0 0.95  0 0 0 0 1  0 0 0 0.12 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}
[data-theme="light"] .bg-grain { opacity: 0.26; mix-blend-mode: multiply; }

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 20px var(--gutter);
  background: linear-gradient(180deg, rgba(4, 8, 15, 0.80) 0%, rgba(4, 8, 15, 0) 100%);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: padding 0.4s var(--ease), background 0.4s var(--ease);
}
.nav.is-scrolled {
  padding-top: 14px; padding-bottom: 14px;
  background: linear-gradient(180deg, rgba(4, 8, 15, 0.94) 0%, rgba(4, 8, 15, 0.74) 100%);
  border-bottom: 1px solid var(--border-1);
}
[data-theme="light"] .nav { background: linear-gradient(180deg, rgba(244, 247, 251, 0.88) 0%, rgba(244, 247, 251, 0) 100%); }
[data-theme="light"] .nav.is-scrolled { background: linear-gradient(180deg, rgba(244, 247, 251, 0.96) 0%, rgba(244, 247, 251, 0.8) 100%); }

.nav__brand { display: flex; align-items: center; gap: 14px; min-width: 0; }
.nav__mark { width: 38px; height: 38px; flex: none; }
.nav__mark circle, .nav__mark path { transition: stroke 0.4s var(--ease); }
.nav__brand-text { display: flex; flex-direction: column; line-height: 1.1; min-width: 0; }
.nav__brand-name {
  font-size: 13px; letter-spacing: 0.22em; font-weight: 700;
  text-transform: uppercase; color: var(--text-0);
}
.nav__brand-sub {
  font-size: 10px; letter-spacing: 0.16em; color: var(--text-2);
  text-transform: uppercase; font-family: var(--font-serif); font-style: normal;
}

.nav__menu {
  display: flex; gap: 26px;
  font-size: 11px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--text-2);
}
.nav__menu a { position: relative; padding: 6px 0; transition: color 0.35s var(--ease); white-space: nowrap; }
.nav__menu a:hover, .nav__menu a:focus-visible { color: var(--brand-cyan-bright); outline: none; }
.nav__menu a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: -2px;
  height: 1px; background: var(--brand-cyan); transition: right 0.5s var(--ease);
}
.nav__menu a:hover::after, .nav__menu a:focus-visible::after { right: 0; }

.nav__actions { display: flex; align-items: center; gap: 10px; flex: none; }
.icon-btn {
  width: 38px; height: 38px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--border-1);
  border-radius: var(--radius-sm);
  color: var(--text-2);
  transition: color 0.3s var(--ease), border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.icon-btn:hover { color: var(--brand-cyan-bright); border-color: var(--brand-cyan); background: rgba(0, 163, 224, 0.08); }
.icon-btn svg { width: 17px; height: 17px; }
.nav__theme .icon-sun { display: none; }
[data-theme="light"] .nav__theme .icon-moon { display: none; }
[data-theme="light"] .nav__theme .icon-sun { display: block; }

.nav__burger { display: none; }

.nav__progress {
  position: absolute; left: 0; bottom: 0; height: 2px;
  background: linear-gradient(90deg, var(--brand-cyan-bright), var(--brand-aurora));
  width: 0%; box-shadow: 0 0 12px var(--brand-cyan);
  transition: width 0.1s linear;
}

/* mobile menu */
@media (max-width: 980px) {
  /* backdrop-filter on .nav establishes a containing block for fixed descendants, which
     trapped .nav__menu inside the ~68px nav bar (crooked, see-through overlay). Drop it
     on mobile so the menu's position:fixed resolves against the viewport. */
  .nav { backdrop-filter: none; -webkit-backdrop-filter: none; }

  .nav__menu {
    position: fixed; inset: 0;
    flex-direction: column; justify-content: center; align-items: center;
    gap: 4px; font-size: 20px; letter-spacing: 0.1em;
    /* fully opaque, theme-aware panel + subtle brand glow — no content bleed-through */
    background: radial-gradient(120% 80% at 82% 4%, rgba(46, 155, 201, 0.12), transparent 60%), var(--bg-0);
    padding: calc(84px + env(safe-area-inset-top)) 24px calc(40px + env(safe-area-inset-bottom));
    transform: translateX(100%); transition: transform 0.45s var(--ease);
    z-index: 45;            /* below the nav bar (50) so brand + ✕ stay tappable on top */
    overflow-y: auto; overscroll-behavior: contain;
  }
  .nav__menu.is-open { transform: none; }
  /* the menu is a child of .nav, so its z-index only orders it against siblings inside
     .nav's stacking context — lift the brand + actions above it so the logo and ✕ stay
     visible AND tappable over the open panel. */
  .nav__brand, .nav__actions { position: relative; z-index: 46; }
  .nav__menu a {
    width: min(420px, 100%); padding: 15px 12px; text-align: center;
    color: var(--text-1); font-weight: 500;
  }
  .nav__menu a::after { display: none; }   /* left-anchored underline doesn't suit centered items */
  .nav__menu a:active { color: var(--brand-cyan-bright); }

  .nav__burger { display: inline-flex; }
  .nav__burger .icon-close { display: none; }

  /* open state: lock the page behind the menu and swap burger → ✕ */
  html.menu-open, html.menu-open body { overflow: hidden; }
  html.menu-open .nav__burger .icon-bars { display: none; }
  html.menu-open .nav__burger .icon-close { display: inline-flex; }
  html.menu-open .nav__burger { color: var(--text-0); border-color: var(--border-2); }  /* clear ✕ on the panel */
  html.menu-open .chat__launcher { display: none; }   /* don't float over the open menu */
}

/* ============================================================
   SECTION BASE
   ============================================================ */
.section { position: relative; padding: clamp(80px, 12vh, 150px) var(--gutter) clamp(70px, 10vh, 120px); background: var(--bg-0); }
/* first section after hero: smooth transition from the video backdrop */
#profile { background: linear-gradient(180deg, rgba(5,14,24,0) 0%, var(--bg-0) clamp(120px, 18vh, 240px)); }
[data-theme="light"] #profile { background: linear-gradient(180deg, rgba(244,242,236,0) 0%, var(--bg-0) clamp(120px, 18vh, 240px)); }
.section__inner { width: 100%; max-width: var(--max-w); margin: 0 auto; }

.eyebrow {
  font-family: var(--font-sans); font-weight: 600;
  font-size: 11.5px; letter-spacing: 0.26em; color: var(--brand-cyan-bright);
  text-transform: uppercase; display: inline-flex; align-items: center; gap: 14px;
  margin-bottom: 26px;
}
.eyebrow::before { content: ""; width: 40px; height: 1px; background: var(--accent-line); }

.section__title {
  font-family: var(--font-display);
  font-weight: 400; font-size: var(--fs-h2); line-height: 1.08;
  letter-spacing: -0.012em; color: var(--text-0);
  max-width: 20ch; margin-bottom: 26px;
}
.section__title strong { font-weight: 600; color: var(--brand-cyan-bright); font-style: normal; }

.section__lede {
  font-family: var(--font-sans); font-style: normal; font-weight: 400;
  font-size: var(--fs-lede); line-height: 1.62; color: var(--text-1);
  max-width: 56ch; margin-bottom: clamp(40px, 6vw, 64px);
}

/* glass panel */
.panel {
  position: relative;
  background: var(--panel-glass);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  transition: border-color 0.4s var(--ease), transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}
.panel:hover { border-color: var(--border-2); transform: translateY(-4px); box-shadow: var(--glow-cyan); }

/* serif financial numerals */
.num { font-family: var(--font-serif); font-style: normal; font-weight: 400; letter-spacing: -0.01em; }

/* buttons */
.btn {
  display: inline-flex; align-items: center; gap: 12px;
  padding: 14px 26px; border-radius: var(--radius-sm);
  font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; font-weight: 600;
  border: 1px solid var(--border-2); color: var(--text-0);
  background: rgba(0, 163, 224, 0.06);
  transition: all 0.35s var(--ease);
}
.btn:hover { border-color: var(--brand-cyan-bright); background: rgba(0, 163, 224, 0.16); box-shadow: var(--glow-cyan); transform: translateY(-2px); }
.btn svg { width: 16px; height: 16px; }

/* reveal */
[data-reveal] {
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
  transition-delay: var(--d, 0ms);
}
[data-reveal].in { opacity: 1; transform: none; }
/* safety net: if main.js never runs (CDN/parse hiccup), reveal everything after 5s */
@keyframes revealSafety { to { opacity: 1; transform: none; } }
[data-reveal] { animation: revealSafety 0.4s var(--ease) 5s forwards; }
[data-reveal].in { animation: none; }

/* ============================================================
   FOOTER
   ============================================================ */
.foot {
  position: relative;
  padding: clamp(60px, 8vw, 90px) var(--gutter) 40px;
  border-top: 1px solid var(--border-1);
  background: var(--bg-1);
}
.foot__inner {
  max-width: var(--max-w); margin: 0 auto;
  display: grid; grid-template-columns: 1.4fr 1fr; gap: clamp(32px, 5vw, 64px);
  align-items: start;
}
.foot__legal { font-size: 18px; font-weight: 600; color: var(--text-0); margin-bottom: 14px; }
.foot__addr { color: var(--text-2); max-width: 40ch; line-height: 1.7; }
.foot__disclaimer { color: var(--text-3); font-size: 13px; line-height: 1.7; max-width: 52ch; }
.foot__bottom {
  max-width: var(--max-w); margin: 48px auto 0; padding-top: 24px;
  border-top: 1px solid var(--border-1);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  font-size: 12px; letter-spacing: 0.04em; color: var(--text-3);
}

/* ============================================================
   CMS · EDIT MODE CHROME
   ============================================================ */
.nav__mode .label-edit { display: none; }
html[data-mode="edit"] .nav__mode { color: var(--brand-cyan-bright); border-color: var(--brand-cyan); background: rgba(0, 163, 224, 0.14); }
html[data-mode="edit"] .nav__mode .label-view { display: none; }
html[data-mode="edit"] .nav__mode .label-edit { display: inline; }

/* editable highlight (only in edit mode) */
html[data-mode="edit"] [data-content-key] {
  outline: 1px dashed rgba(91, 209, 250, 0.32);
  outline-offset: 3px;
  border-radius: 3px;
  cursor: text;
  transition: outline-color 0.25s var(--ease), background 0.25s var(--ease);
}
html[data-mode="edit"] [data-content-key]:hover { outline-color: var(--brand-cyan-bright); background: rgba(0, 163, 224, 0.06); }
html[data-mode="edit"] [data-content-key]:focus { outline: 2px solid var(--brand-cyan-bright); background: rgba(0, 163, 224, 0.1); }
html[data-mode="edit"] [data-content-key].is-dirty { outline-color: var(--warn); }

/* global badge */
.mode-badge {
  position: fixed; left: 50%; top: 16px; transform: translate(-50%, -20px);
  z-index: 60; padding: 9px 20px; border-radius: 999px;
  font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; font-weight: 700;
  color: var(--accent-ink); background: linear-gradient(120deg, var(--brand-cyan-bright), var(--brand-aurora));
  box-shadow: 0 8px 30px rgba(0, 163, 224, 0.4);
  opacity: 0; pointer-events: none;
  transition: opacity 0.4s var(--ease), transform 0.4s var(--ease);
}
html[data-mode="edit"] .mode-badge { opacity: 1; transform: translate(-50%, 0); }
.mode-badge::before { content: "● "; }

/* floating save button */
.save-fab {
  position: fixed; right: clamp(16px, 3vw, 40px); bottom: clamp(16px, 3vw, 40px);
  z-index: 60; display: none; align-items: center; gap: 12px;
  padding: 16px 28px; border-radius: 999px; font-weight: 700;
  font-size: 13px; letter-spacing: 0.06em;
  color: var(--accent-ink); background: linear-gradient(120deg, var(--brand-cyan-bright), var(--brand-aurora));
  box-shadow: 0 12px 40px rgba(0, 163, 224, 0.45);
  transition: transform 0.3s var(--ease-spring), box-shadow 0.3s var(--ease), opacity 0.3s var(--ease);
}
html[data-mode="edit"] .save-fab { display: inline-flex; }
.save-fab:hover { transform: translateY(-3px) scale(1.03); }
.save-fab[disabled] { opacity: 0.45; cursor: default; transform: none; }
.save-fab svg { width: 18px; height: 18px; }
.save-fab.is-busy { pointer-events: none; }
.save-fab .dirty-count {
  font-family: var(--font-mono); font-size: 12px;
  background: rgba(4, 16, 30, 0.25); padding: 2px 8px; border-radius: 999px;
}

/* toast */
.toast {
  position: fixed; left: 50%; bottom: 30px; transform: translate(-50%, 24px);
  z-index: 70; padding: 12px 22px; border-radius: var(--radius-sm);
  background: var(--panel-grad); border: 1px solid var(--border-2);
  color: var(--text-0); font-size: 13px; letter-spacing: 0.02em;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  opacity: 0; pointer-events: none;
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.err { border-color: var(--bad); }
.toast.ok { border-color: var(--ok); }