:root {
  color-scheme: light;
  --bg-primary: #edf7fc;
  --bg-secondary: #dceef8;
  --bg-card: #fffaf0;
  --bg-elevated: #e5f3fb;
  --accent: #8a5914;
  --accent-hover: #70470f;
  --text-primary: #16364d;
  --text-secondary: #47677c;
  --text-muted: #607d90;
  --border: #b7d2e3;
  --shadow-lg: 0 18px 48px rgba(16, 47, 69, 0.2);
  --radius: 6px;
  --radius-lg: 8px;
  --radius-xl: 8px;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg-primary: #102b40;
  --bg-secondary: #0a2234;
  --bg-card: #173b55;
  --bg-elevated: #214861;
  --accent: #e3b45d;
  --accent-hover: #f0c778;
  --text-primary: #f7e8c8;
  --text-secondary: #c4d8e3;
  --text-muted: #a9c5d6;
  --border: #39627d;
  --shadow-lg: 0 18px 48px rgba(2, 14, 24, 0.42);
}

body {
  font-family: Aptos, Calibri, "Trebuchet MS", sans-serif;
  background: var(--bg-primary);
}

.navbar {
  height: 76px;
  padding: 0 max(24px, calc((100% - 1180px) / 2));
  background: color-mix(in srgb, var(--bg-secondary) 94%, transparent);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}

.navbar-brand { gap: 9px; }
.navbar-brand .nexus-brand-image { width: 42px; height: 42px; }
.navbar-logo {
  color: var(--text-primary);
  font-family: "Trebuchet MS", Aptos, sans-serif;
  font-size: 1.25rem;
  letter-spacing: 0;
}
.navbar-logo::first-letter { color: var(--accent); }
.navbar-nav { gap: 20px; }
.navbar .btn { min-height: 42px; padding-inline: 18px; }
.navbar .btn-ghost { color: var(--text-secondary); }
.navbar .btn-ghost:hover { color: var(--accent); background: transparent; }

.auth-page,
.auth-page[style] {
  min-height: 100vh;
  padding: 116px 24px 56px !important;
  align-items: center !important;
  background-image:
    linear-gradient(90deg, rgba(10, 34, 52, 0.9), rgba(16, 43, 64, 0.72)),
    url("/img/sunfang-background-final-horizontal.webp");
  background-position: center top;
  background-size: cover;
  background-attachment: fixed;
}

.auth-card,
.auth-card[style] {
  width: min(100%, 560px);
  max-width: 560px !important;
  padding: clamp(30px, 5vw, 48px);
  background: color-mix(in srgb, var(--bg-card) 92%, transparent);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(14px);
}

#register-form { max-width: 100%; }
body:has(#register-form) .auth-card { max-width: 680px !important; }

.auth-logo { gap: 10px; margin-bottom: 24px; }
.auth-logo .nexus-brand-image { width: 54px; height: 54px; }
.auth-logo .logo-text {
  color: var(--text-primary);
  font-family: "Trebuchet MS", Aptos, sans-serif;
  font-size: clamp(1.6rem, 4vw, 2rem);
  letter-spacing: 0;
}

.auth-title {
  margin-bottom: 8px;
  color: var(--text-primary);
  font-family: "Palatino Linotype", Georgia, serif;
  font-size: clamp(1.8rem, 4vw, 2.35rem);
  line-height: 1.15;
}
.auth-subtitle { margin-bottom: 30px; color: var(--text-secondary); font-size: 1rem; }

.form-row { gap: 18px; }
.form-group { margin-bottom: 18px; }
.form-label {
  margin-bottom: 7px;
  color: var(--text-secondary);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0;
}
.form-input {
  min-height: 50px;
  padding: 12px 14px;
  background: color-mix(in srgb, var(--bg-elevated) 88%, transparent);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 1rem;
}
.form-input:focus {
  background: var(--bg-card);
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}
.form-input::placeholder { color: var(--text-muted); opacity: 0.78; }
.input-group .form-input { border-radius: 6px 0 0 6px; }
.input-group .input-addon {
  min-width: 50px;
  justify-content: center;
  padding: 12px;
  background: color-mix(in srgb, var(--bg-elevated) 88%, transparent);
  border: 1px solid var(--border);
  border-left: 0;
  border-radius: 0 6px 6px 0;
}
.form-hint { margin-top: 6px; line-height: 1.45; }

.btn { border-radius: 6px; }
.btn-primary { background: var(--accent); color: #102f45; }
.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  color: #102f45;
  box-shadow: 0 4px 15px color-mix(in srgb, var(--accent) 34%, transparent);
}
.btn-secondary { border-color: var(--border); }
.btn-lg { min-height: 52px; padding: 12px 24px; font-size: 1rem; }

.avatar-grid { gap: 10px; }
.avatar-item {
  min-width: 0;
  padding: 10px 6px;
  background: color-mix(in srgb, var(--bg-elevated) 78%, transparent);
  border-radius: 6px;
}
.avatar-item.selected { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 14%, var(--bg-card)); }
.avatar-emoji { font-size: 1.55rem; }
.avatar-label { font-size: 0.68rem; }

.auth-divider { margin: 26px 0; }
.auth-footer { color: var(--text-secondary); }
.auth-footer a { color: var(--accent); font-weight: 800; }

@media (min-width: 761px) {
  .navbar .btn {
    min-height: 48px;
    padding: 11px 24px;
    font-size: 0.95rem;
  }
  .auth-card .btn {
    min-height: 46px;
    padding: 11px 22px;
    font-size: 0.95rem;
  }
  .auth-card .btn-lg {
    min-height: 58px;
    padding: 14px 28px;
    font-size: 1.1rem;
  }
}

@media (max-width: 760px) {
  .navbar { height: 68px; padding: 0 16px; }
  .navbar-brand .nexus-brand-image { width: 36px; height: 36px; }
  .navbar-logo { font-size: 1.05rem; }
  .navbar-nav { gap: 6px; }
  .navbar .btn { min-height: 38px; padding: 7px 11px; font-size: 0.8rem; }
  .auth-card .btn { min-height: 40px; padding: 8px 14px; font-size: 0.82rem; }
  .auth-card .btn-lg { min-height: 52px; padding: 12px 24px; font-size: 1rem; }

  .auth-page,
  .auth-page[style] {
    min-height: 100svh;
    padding: 88px 14px 28px !important;
    background-image:
      linear-gradient(rgba(10, 34, 52, 0.8), rgba(16, 43, 64, 0.9)),
      url("/img/sunfang-background-final.webp");
    background-position: 58% center;
    background-attachment: scroll;
  }

  .auth-card,
  .auth-card[style] {
    padding: 26px 20px 30px;
  }
  .auth-logo { margin-bottom: 18px; }
  .auth-logo .nexus-brand-image { width: 44px; height: 44px; }
  .auth-title { font-size: 1.8rem; }
  .auth-subtitle { margin-bottom: 24px; font-size: 0.92rem; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .form-group { margin-bottom: 16px; }
  .form-input { min-height: 48px; }
  .avatar-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (max-width: 380px) {
  .navbar-logo { display: none; }
  .avatar-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}