@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;600;700;900&family=Space+Grotesk:wght@500;600;700&display=swap");

:root {
  color-scheme: dark;
  --ink: #f2f2ec;
  --muted: rgba(242, 242, 236, 0.62);
  --line: rgba(242, 242, 236, 0.22);
  --accent: #c6ef46;
  --panel: #0b0d0b;
  --hero-image: url("/img/m48a5_patton_cn.jpg");
  --hero-image-x: 54%;
  --hero-image-y: 50%;
  --hero-title-x: 50%;
  --hero-title-y: 50%;
  --hero-title-scale: 1;
  --hero-overlay: 0.66;
  --card-width: 60rem;
  font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-snap-type: y mandatory;
  background: var(--panel);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--panel);
  overflow-x: hidden;
}

body.drawer-open {
  overflow: hidden;
}

a,
button {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

.site-controls {
  position: fixed;
  z-index: 50;
  top: 0;
  left: 0;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: clamp(1.1rem, 2.5vw, 2rem) clamp(1rem, 4vw, 3.5rem);
  pointer-events: none;
}

.menu-toggle,
.social-links {
  pointer-events: auto;
}

.menu-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  min-height: 2.75rem;
  padding: 0.55rem 1rem;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 999px;
  color: var(--ink);
  background: rgba(6, 8, 6, 0.52);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  transition: border-color 180ms ease, background 180ms ease, transform 180ms ease;
}

.menu-toggle:hover {
  border-color: rgba(255, 255, 255, 0.55);
  background: rgba(6, 8, 6, 0.78);
  transform: translateY(-2px);
}

.menu-toggle__icon {
  position: relative;
  width: 1.1rem;
  height: 0.8rem;
}

.menu-toggle__icon i {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
}

.menu-toggle__icon i:first-child {
  top: 0.2rem;
}

.menu-toggle__icon i:last-child {
  bottom: 0.15rem;
  width: 68%;
}

.social-links {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.social-links a {
  width: 2.75rem;
  height: 2.75rem;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 50%;
  color: #fff;
  background: rgba(6, 8, 6, 0.52);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: border-color 180ms ease, background 180ms ease, transform 180ms ease;
}

.social-links a:hover {
  border-color: var(--accent);
  background: rgba(6, 8, 6, 0.82);
  transform: translateY(-2px);
}

.social-links img {
  display: block;
  object-fit: contain;
}

.social-links .admin-link span {
  display: block;
  font-family: "Segoe UI Symbol", "Noto Sans SC", sans-serif;
  font-size: 1.25rem;
  line-height: 1;
}

.drawer-backdrop {
  position: fixed;
  z-index: 59;
  inset: 0;
  visibility: hidden;
  background: rgba(0, 0, 0, 0.58);
  opacity: 0;
  transition: opacity 320ms ease, visibility 320ms ease;
}

.site-drawer {
  position: fixed;
  z-index: 60;
  inset: 0 auto 0 0;
  width: min(88vw, 23rem);
  display: flex;
  flex-direction: column;
  padding: 1.8rem;
  color: #171a13;
  background: #e7e9df;
  box-shadow: 1rem 0 4rem rgba(0, 0, 0, 0.34);
  transform: translateX(-105%);
  visibility: hidden;
  transition: transform 420ms cubic-bezier(0.76, 0, 0.24, 1), visibility 420ms ease;
}

.drawer-open .drawer-backdrop {
  visibility: visible;
  opacity: 1;
}

.drawer-open .site-drawer {
  visibility: visible;
  transform: translateX(0);
}

.site-drawer__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid rgba(23, 26, 19, 0.22);
}

.site-drawer__eyebrow,
.site-drawer__footer,
.qa-card__label,
.scroll-cue,
.back-to-top {
  font-family: "Space Grotesk", "Noto Sans SC", sans-serif;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.site-drawer__eyebrow {
  font-size: 0.72rem;
  font-weight: 700;
}

.drawer-close {
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid rgba(23, 26, 19, 0.24);
  border-radius: 50%;
  color: inherit;
  background: transparent;
  cursor: pointer;
  font-size: 1.65rem;
  font-weight: 300;
  line-height: 1;
  transition: color 160ms ease, background 160ms ease, transform 160ms ease;
}

.drawer-close:hover {
  color: #fff;
  background: #171a13;
  transform: rotate(6deg);
}

.site-drawer__nav {
  margin-top: clamp(4rem, 14vh, 8rem);
}

.site-drawer__nav a {
  display: grid;
  grid-template-columns: 2rem 1fr auto;
  align-items: baseline;
  gap: 0.8rem;
  padding: 1.35rem 0;
  border-bottom: 1px solid rgba(23, 26, 19, 0.22);
  color: inherit;
  font-size: clamp(1.7rem, 5vw, 2.5rem);
  font-weight: 700;
  text-decoration: none;
  transition: padding-left 180ms ease, color 180ms ease;
}

.site-drawer__nav a:hover {
  padding-left: 0.45rem;
  color: #5b7410;
}

.site-drawer__nav .nav-index {
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.68rem;
  font-weight: 600;
}

.site-drawer__footer {
  margin: auto 0 0;
  font-size: 0.66rem;
  opacity: 0.6;
}

.page-stack {
  position: relative;
}

.panel {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  align-items: center;
  overflow: hidden;
  padding: clamp(6.5rem, 11vw, 9rem) clamp(1.25rem, 8vw, 8rem) clamp(4rem, 8vw, 7rem);
  scroll-snap-align: start;
  scroll-snap-stop: always;
}

.hero {
  isolation: isolate;
  place-items: center;
  padding: 2rem;
  background:
    linear-gradient(180deg, rgba(4, 6, 4, calc(var(--hero-overlay) * 0.18)), rgba(4, 6, 4, var(--hero-overlay))),
    var(--hero-image) var(--hero-image-x) var(--hero-image-y) / cover no-repeat;
}

.hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0;
  background:
    radial-gradient(circle at 50% 42%, transparent 0, rgba(0, 0, 0, 0.08) 34%, rgba(0, 0, 0, 0.55) 100%),
    linear-gradient(90deg, rgba(0, 0, 0, 0.18), transparent 20%, transparent 80%, rgba(0, 0, 0, 0.18));
}

.hero__grid {
  position: absolute;
  z-index: -1;
  inset: 0;
  opacity: 0.16;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.28) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.28) 1px, transparent 1px);
  background-size: 9vw 9vw;
  mask-image: linear-gradient(to bottom, transparent, #000 20%, #000 80%, transparent);
}

.hero__content {
  position: absolute;
  top: var(--hero-title-y);
  left: var(--hero-title-x);
  text-align: center;
  transform: translate(-50%, -50%) scale(var(--hero-title-scale));
  transform-origin: center;
}

.hero h1 {
  margin: 0;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  font-size: clamp(3.5rem, 13vw, 10.5rem);
  font-weight: 700;
  line-height: 0.82;
  letter-spacing: clamp(0.04em, 1.1vw, 0.12em);
  text-indent: clamp(0.04em, 1.1vw, 0.12em);
  text-shadow: 0 0.3rem 2.3rem rgba(0, 0, 0, 0.54);
}

.scroll-cue {
  position: absolute;
  bottom: clamp(1.2rem, 3vw, 2.5rem);
  left: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.7rem;
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.58rem;
  font-weight: 600;
  text-decoration: none;
  transform: translateX(-50%);
}

.scroll-cue i {
  width: 1px;
  height: 2rem;
  display: block;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.25);
}

.scroll-cue i::after {
  content: "";
  width: 100%;
  height: 55%;
  display: block;
  background: #fff;
  animation: scroll-line 1.8s ease-in-out infinite;
}

@keyframes scroll-line {
  0% { transform: translateY(-120%); }
  55%, 100% { transform: translateY(210%); }
}

.qa-panel {
  isolation: isolate;
  background:
    radial-gradient(circle at 85% 20%, rgba(198, 239, 70, 0.09), transparent 32%),
    linear-gradient(135deg, #0c0f0c 0%, #11150f 100%);
}

.qa-panel::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0;
  opacity: 0.24;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.065) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.065) 1px, transparent 1px);
  background-size: 5rem 5rem;
  mask-image: linear-gradient(115deg, transparent 5%, #000 60%, transparent 100%);
}

.qa-panel--reverse {
  justify-items: end;
  background:
    radial-gradient(circle at 12% 74%, rgba(198, 239, 70, 0.08), transparent 28%),
    linear-gradient(225deg, #0b0d0b 0%, #151911 100%);
}

.qa-panel--final {
  background:
    linear-gradient(135deg, rgba(4, 6, 4, 0.88), rgba(8, 11, 7, 0.78)),
    var(--hero-image) center / cover no-repeat;
}

.qa-panel.has-page-background {
  background:
    linear-gradient(135deg, rgba(4, 6, 4, var(--page-overlay, 0.78)), rgba(8, 11, 7, var(--page-overlay, 0.78))),
    var(--page-background) var(--page-image-x, 50%) var(--page-image-y, 50%) / cover no-repeat;
}

.qa-panel__number {
  position: absolute;
  right: -0.04em;
  bottom: -0.18em;
  z-index: -1;
  color: rgba(255, 255, 255, 0.035);
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(14rem, 37vw, 34rem);
  font-weight: 700;
  line-height: 0.8;
}

.qa-panel--reverse .qa-panel__number {
  right: auto;
  left: -0.08em;
}

.qa-card {
  --actual-card-width: min(calc(100% - 2.8rem), var(--card-width));
  position: absolute;
  top: var(--card-y, 50%);
  left: clamp(
    calc(var(--actual-card-width) / 2 + 1.4rem),
    var(--card-x, 42%),
    calc(100% - var(--actual-card-width) / 2 - 1.4rem)
  );
  width: var(--actual-card-width);
  transform: translate(-50%, -50%);
}

#who { --card-x: 42%; --card-y: 50%; }
#features { --card-x: 58%; --card-y: 50%; }
#contact { --card-x: 42%; --card-y: 50%; }
#support { --card-x: 42%; --card-y: 50%; }

.js .qa-card.reveal {
  opacity: 0;
  transform: translate(-50%, calc(-50% + 3.5rem));
  transition: opacity 720ms ease, transform 900ms cubic-bezier(0.16, 1, 0.3, 1);
}

.js .panel.is-visible .qa-card.reveal {
  opacity: 1;
  transform: translate(-50%, -50%);
}

html.creator-preview {
  scroll-snap-type: y mandatory;
}

.creator-preview body {
  user-select: none;
}

.creator-preview .site-controls,
.creator-preview .scroll-cue,
.creator-preview .back-to-top {
  pointer-events: none;
}

.creator-preview .hero,
.creator-preview .qa-card {
  cursor: grab;
}

.creator-preview .qa-panel {
  cursor: crosshair;
}

.creator-preview .hero.is-creator-dragging,
.creator-preview .qa-card.is-creator-dragging {
  cursor: grabbing;
}

.creator-preview .hero__content,
.creator-preview .qa-card {
  outline: 1px dashed rgba(198, 239, 70, 0.72);
  outline-offset: 10px;
}

.creator-preview .hero__content::after,
.creator-preview .qa-card::after {
  position: absolute;
  top: -32px;
  left: -11px;
  border-radius: 999px;
  padding: 5px 8px;
  color: #10140a;
  background: var(--accent);
  font: 700 9px/1 "Space Grotesk", sans-serif;
  letter-spacing: 0.08em;
  content: "DRAG";
  pointer-events: none;
}

.creator-preview .hero__content.is-creator-selected,
.creator-preview .qa-card.is-creator-selected {
  outline-style: solid;
  outline-width: 2px;
}

.qa-card__label {
  margin: 0 0 clamp(1.2rem, 3vw, 2rem);
  color: var(--accent);
  font-size: clamp(0.62rem, 1vw, 0.75rem);
  font-weight: 700;
}

.qa-card h2 {
  max-width: 16ch;
  margin: 0;
  font-size: clamp(2.35rem, 6.4vw, 6.4rem);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.05em;
  text-wrap: balance;
}

.qa-card__rule {
  width: 100%;
  height: 1px;
  margin: clamp(1.5rem, 3.4vw, 2.8rem) 0;
  overflow: hidden;
  background: var(--line);
}

.qa-card__rule::before {
  content: "";
  width: 0;
  height: 100%;
  display: block;
  background: var(--accent);
  transition: width 850ms 280ms cubic-bezier(0.16, 1, 0.3, 1);
}

.panel.is-visible .qa-card__rule::before {
  width: clamp(4rem, 12vw, 9rem);
}

.qa-card > p:last-of-type {
  max-width: 50rem;
  margin: 0;
  color: rgba(242, 242, 236, 0.76);
  font-size: clamp(1rem, 1.65vw, 1.32rem);
  font-weight: 300;
  line-height: 1.95;
  text-wrap: pretty;
}

.qa-card__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2rem;
}

.qa-card__links a {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.05rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink);
  font-size: 0.82rem;
  font-weight: 500;
  text-decoration: none;
  transition: color 180ms ease, background 180ms ease, border-color 180ms ease;
}

.qa-card__links a:hover {
  border-color: var(--accent);
  color: #161b0c;
  background: var(--accent);
}

.back-to-top {
  position: absolute;
  right: clamp(1.2rem, 4vw, 3.5rem);
  bottom: clamp(1.2rem, 3vw, 2.5rem);
  color: rgba(255, 255, 255, 0.62);
  font-size: 0.62rem;
  font-weight: 600;
  text-decoration: none;
  transition: color 160ms ease;
}

.back-to-top:hover {
  color: var(--accent);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

@media (max-width: 720px) {
  .site-controls {
    padding: 1rem;
  }

  .menu-toggle {
    width: 2.75rem;
    justify-content: center;
    padding: 0;
  }

  .menu-toggle > span:last-child {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
  }

  .hero h1 {
    font-size: clamp(3rem, 16vw, 6rem);
    letter-spacing: 0.02em;
    text-indent: 0.02em;
  }

  .panel {
    padding-inline: 1.4rem;
  }

  .qa-card {
    left: 50%;
  }

  .qa-card h2 {
    font-size: clamp(2.25rem, 11vw, 4rem);
  }

  .qa-card > p:last-of-type {
    line-height: 1.8;
  }
}

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

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

  .js .qa-card.reveal {
    opacity: 1;
    transform: translate(-50%, -50%);
  }
}