[hidden] {
  display: none !important;
}

.support-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: var(--surface);
  color: var(--lime);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: color 180ms ease, background 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.support-button svg {
  width: 15px;
  height: 15px;
}

.support-button:hover {
  color: var(--bg);
  border-color: var(--lime);
  background: var(--lime);
  transform: translateY(-1px);
}

.support-backdrop {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(5, 8, 10, 0.76);
  backdrop-filter: blur(10px);
}

.support-dialog {
  position: relative;
  width: min(460px, 100%);
  max-height: calc(100vh - 40px);
  overflow: auto;
  padding: 28px;
  background: var(--surface);
  border: 1px solid rgba(237, 245, 239, 0.24);
  border-radius: 8px;
  box-shadow: var(--shadow);
  animation: dialog-in 220ms cubic-bezier(0.22, 0.61, 0.36, 1) both;
}

@keyframes dialog-in {
  from { opacity: 0; transform: translateY(10px) scale(0.985); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.support-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 1px solid transparent;
  border-radius: 50%;
  background: transparent;
  color: var(--muted);
  transition: color 160ms ease, background 160ms ease, border-color 160ms ease;
}

.support-close:hover {
  border-color: var(--line);
  background: var(--surface-2);
  color: var(--ink);
}

.support-close svg {
  width: 18px;
  height: 18px;
}

.support-eyebrow {
  display: block;
  color: var(--cyan);
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.18em;
  margin-bottom: 10px;
}

.support-head h2 {
  margin: 0 0 12px;
  font: 700 26px Orbitron, sans-serif;
  letter-spacing: -0.04em;
}

.support-head p {
  max-width: 360px;
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.75;
}

.support-channel-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 24px;
}

.support-channel {
  min-width: 0;
  min-height: 76px;
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface-2);
  color: var(--ink);
  font: inherit;
  text-align: left;
  transition: border-color 160ms ease, background 160ms ease, transform 160ms ease;
}

.support-channel:hover {
  border-color: rgba(115, 231, 210, 0.55);
  transform: translateY(-1px);
}

.support-channel[aria-pressed="true"] {
  border-color: var(--cyan);
  background: rgba(115, 231, 210, 0.12);
}

.support-channel-icon {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: #fff;
}

.support-channel-icon svg {
  width: 17px;
  height: 17px;
}

.support-channel-icon.wechat {
  background: #07c160;
}

.support-channel-icon.alipay {
  background: #1677ff;
}

.support-channel-name {
  display: block;
  font-weight: 600;
  line-height: 1.4;
}

.support-channel-note {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.4;
}

.support-qr {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px dashed var(--line);
  text-align: center;
  animation: dialog-in 180ms ease both;
}

.support-qr img {
  width: 180px;
  height: 180px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  object-fit: contain;
}

.support-qr p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.support-footnote {
  margin: 18px 0 0;
  color: var(--faint);
  font-size: 10px;
  line-height: 1.6;
}

.support-callout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: center;
  margin-top: 54px;
  padding: 24px;
  border: 1px solid rgba(115, 231, 210, 0.24);
  background: linear-gradient(120deg, rgba(115, 231, 210, 0.08), transparent 60%);
}

.support-callout h3 {
  margin: 0 0 7px;
  font: 700 20px Orbitron, sans-serif;
  letter-spacing: -0.03em;
}

.support-callout p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

@media (max-width: 600px) {
  .support-button span {
    display: none;
  }

  .support-button {
    padding: 0 10px;
  }

  .support-channel-list {
    grid-template-columns: 1fr;
  }

  .support-dialog {
    padding: 24px 18px 22px;
  }

  .support-callout {
    grid-template-columns: 1fr;
  }

  .support-callout .button {
    justify-self: start;
  }
}