:root {
  color-scheme: light dark;
  --bg: #0b1220;
  --bg-2: #132033;
  --bg-3: #1a2740;
  --card: rgba(22, 32, 48, 0.72);
  --card-border: rgba(148, 163, 184, 0.16);
  --text: #e8eef8;
  --muted: #9aabbf;
  --accent: #3b82f6;
  --accent-2: #8b5cf6;
  --accent-hover: #2563eb;
  --error: #f87171;
  --border: rgba(148, 163, 184, 0.22);
  --input-bg: rgba(8, 14, 24, 0.55);
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  --glow-1: rgba(59, 130, 246, 0.35);
  --glow-2: rgba(139, 92, 246, 0.28);
  --orb-1: #2563eb;
  --orb-2: #7c3aed;
  --orb-3: #0ea5e9;
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #eef3fb;
    --bg-2: #e7edf8;
    --bg-3: #f7f9fc;
    --card: rgba(255, 255, 255, 0.78);
    --card-border: rgba(15, 23, 42, 0.08);
    --text: #0f172a;
    --muted: #64748b;
    --accent: #2563eb;
    --accent-2: #7c3aed;
    --accent-hover: #1d4ed8;
    --error: #dc2626;
    --border: rgba(15, 23, 42, 0.12);
    --input-bg: rgba(255, 255, 255, 0.9);
    --shadow: 0 24px 50px rgba(15, 23, 42, 0.1);
    --glow-1: rgba(37, 99, 235, 0.18);
    --glow-2: rgba(124, 58, 237, 0.14);
    --orb-1: #60a5fa;
    --orb-2: #a78bfa;
    --orb-3: #38bdf8;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  color: var(--text);
  background:
    radial-gradient(1200px 700px at 15% -10%, var(--glow-1), transparent 55%),
    radial-gradient(1000px 600px at 90% 10%, var(--glow-2), transparent 50%),
    linear-gradient(160deg, var(--bg) 0%, var(--bg-2) 45%, var(--bg-3) 100%);
  overflow: hidden;
  position: relative;
}

/* ambient floating orbs */
.bg-orbs {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.bg-orbs span {
  position: absolute;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0.55;
  animation: float 18s ease-in-out infinite;
}

.bg-orbs span:nth-child(1) {
  width: 280px;
  height: 280px;
  left: 8%;
  top: 18%;
  background: var(--orb-1);
  animation-duration: 16s;
}

.bg-orbs span:nth-child(2) {
  width: 340px;
  height: 340px;
  right: 6%;
  bottom: 8%;
  background: var(--orb-2);
  animation-duration: 22s;
  animation-delay: -4s;
}

.bg-orbs span:nth-child(3) {
  width: 220px;
  height: 220px;
  right: 28%;
  top: 12%;
  background: var(--orb-3);
  animation-duration: 19s;
  animation-delay: -8s;
}

@keyframes float {
  0%,
  100% {
    transform: translate3d(0, 0, 0) scale(1);
  }
  33% {
    transform: translate3d(30px, -24px, 0) scale(1.06);
  }
  66% {
    transform: translate3d(-22px, 18px, 0) scale(0.96);
  }
}

#particles-js {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.card {
  position: relative;
  z-index: 1;
  width: min(100% - 2rem, 400px);
  padding: 2.1rem 2rem 1.85rem;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px) saturate(1.2);
  -webkit-backdrop-filter: blur(18px) saturate(1.2);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.35rem;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 10px 24px var(--glow-1);
  flex-shrink: 0;
}

.brand-mark svg {
  width: 22px;
  height: 22px;
}

.brand-text h1 {
  margin: 0;
  font-size: 1.28rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.brand-text p {
  margin: 0.15rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

form {
  display: flex;
  flex-direction: column;
  gap: 0.95rem;
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--muted);
}

.field {
  position: relative;
}

.field svg {
  position: absolute;
  left: 0.8rem;
  top: 50%;
  width: 16px;
  height: 16px;
  transform: translateY(-50%);
  color: var(--muted);
  pointer-events: none;
  opacity: 0.85;
}

input {
  width: 100%;
  padding: 0.72rem 0.8rem 0.72rem 2.35rem;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: var(--input-bg);
  color: var(--text);
  font-size: 0.98rem;
  transition: border-color 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

input::placeholder {
  color: color-mix(in srgb, var(--muted) 80%, transparent);
}

input:hover {
  border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
}

input:focus {
  outline: none;
  border-color: color-mix(in srgb, var(--accent) 70%, var(--border));
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 18%, transparent);
}

button[type="submit"] {
  margin-top: 0.35rem;
  padding: 0.82rem 1rem;
  border: none;
  border-radius: 11px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  box-shadow: 0 10px 22px var(--glow-1);
  transition: transform 0.15s ease, filter 0.15s ease, box-shadow 0.15s ease;
}

button[type="submit"]:hover:not(:disabled) {
  filter: brightness(1.05);
  transform: translateY(-1px);
  box-shadow: 0 14px 28px var(--glow-1);
}

button[type="submit"]:active:not(:disabled) {
  transform: translateY(0);
}

button[type="submit"]:disabled {
  opacity: 0.65;
  cursor: not-allowed;
  box-shadow: none;
}

.captcha-box {
  min-height: 0;
}

.error {
  margin: 0;
  color: var(--error);
  font-size: 0.9rem;
  line-height: 1.4;
}

.footer-note {
  margin: 1.15rem 0 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.78rem;
  opacity: 0.9;
}

/* go-captcha 居中弹层（仿极验 bind 弹出） */
.gocaptcha-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: none;
  place-items: center;
  padding: 1rem;
  background: rgba(2, 6, 23, 0.48);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.22s ease;
}

/* 仅展示时占满层；hidden 属性时保持不拦截点击 */
.gocaptcha-overlay.is-visible {
  display: grid;
  opacity: 1;
  pointer-events: auto;
}

.gocaptcha-overlay.is-hiding {
  display: grid;
  opacity: 0;
  pointer-events: none;
}

.gocaptcha-overlay[hidden] {
  display: none !important;
  pointer-events: none !important;
}

.gocaptcha-panel {
  position: relative;
  max-width: calc(100vw - 2rem);
  border-radius: 12px;
  transform: scale(0.72);
  opacity: 0;
  transform-origin: center center;
  transition:
    transform 0.28s cubic-bezier(0.2, 0.8, 0.2, 1),
    opacity 0.22s ease;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.4);
}

.gocaptcha-panel.is-enter {
  transform: scale(1);
  opacity: 1;
}

/* 验证成功：从大到小隐藏 */
.gocaptcha-panel.is-leave {
  transform: scale(0.55);
  opacity: 0;
  transition:
    transform 0.28s cubic-bezier(0.4, 0, 0.8, 0.2),
    opacity 0.24s ease;
}

.gocaptcha-panel .go-captcha.gc-wrapper {
  margin: 0 auto;
}

@media (prefers-reduced-motion: reduce) {
  .bg-orbs span,
  .card,
  button[type="submit"],
  .gocaptcha-overlay,
  .gocaptcha-panel {
    animation: none !important;
    transition: none !important;
  }

  .gocaptcha-panel.is-enter,
  .gocaptcha-panel.is-leave {
    transform: none;
    opacity: 1;
  }
}