/* Reset & Base */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: #16213e;
  --text-primary: #e8e8f0;
  --text-secondary: #a0a0b8;
  --accent: #6c63ff;
  --accent-light: #8b83ff;
  --accent-glow: rgba(108, 99, 255, 0.3);
  --danger: #ff4757;
  --success: #2ed573;
  --warning: #ffa502;
  --border: #2a2a4a;
  --radius: 12px;
  --radius-sm: 8px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}

/* Star background */
.stars {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(2px 2px at 20px 30px, #eee, transparent),
    radial-gradient(2px 2px at 40px 70px, rgba(255,255,255,0.8), transparent),
    radial-gradient(2px 2px at 50px 160px, #ddd, transparent),
    radial-gradient(2px 2px at 90px 40px, rgba(255,255,255,0.6), transparent),
    radial-gradient(2px 2px at 130px 80px, #fff, transparent),
    radial-gradient(2px 2px at 160px 30px, rgba(255,255,255,0.7), transparent),
    radial-gradient(1px 1px at 200px 120px, #eee, transparent),
    radial-gradient(1px 1px at 250px 60px, #ddd, transparent),
    radial-gradient(2px 2px at 300px 150px, #fff, transparent),
    radial-gradient(1px 1px at 350px 90px, rgba(255,255,255,0.5), transparent);
  background-size: 400px 200px;
  animation: twinkle 4s ease-in-out infinite alternate;
}

@keyframes twinkle {
  0% { opacity: 0.5; }
  100% { opacity: 1; }
}

.container {
  position: relative;
  z-index: 1;
  max-width: 960px;
  margin: 0 auto;
  padding: 40px 20px;
}

/* Header */
header {
  text-align: center;
  margin-bottom: 40px;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 8px;
}

.logo-icon {
  font-size: 2.5rem;
  filter: drop-shadow(0 0 10px rgba(108, 99, 255, 0.5));
}

h1 {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-light), #e040fb);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* Actions */
.actions {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  margin-bottom: 30px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #7c4dff);
  color: #fff;
  box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px var(--accent-glow);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--bg-secondary);
  border-color: var(--accent);
}

.btn-danger {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--danger);
  padding: 6px 16px;
  font-size: 0.85rem;
}

.btn-danger:hover {
  background: rgba(255, 71, 87, 0.1);
}

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 6px 12px;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.btn-outline:hover {
  background: rgba(108, 99, 255, 0.1);
}

.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 12px 14px;
  font-size: 1.1rem;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent-light);
  background: rgba(108, 99, 255, 0.08);
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.contest-link {
  color: var(--text-secondary);
  font-size: 0.85rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color 0.2s;
}

.contest-link:hover {
  color: var(--accent-light);
}

.time-info {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.expires-soon {
  color: var(--warning);
}

.expires-today {
  color: var(--danger);
}

/* ─── Modal ──────────────────────────────────────────── */

.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 999;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.show {
  display: flex;
}

.modal-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 100%;
  max-width: 440px;
  animation: slideDown 0.25s ease;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
}

.modal-header h2 {
  font-size: 1.15rem;
  font-weight: 600;
}

.modal-body {
  padding: 20px 24px;
}

.modal-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.modal-target {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent-light);
  margin-bottom: 16px;
  padding: 8px 12px;
  background: rgba(108, 99, 255, 0.08);
  border-radius: var(--radius-sm);
  word-break: break-all;
}

.pwd-error {
  color: var(--danger);
  font-size: 0.85rem;
  margin-top: 8px;
  min-height: 1.2em;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  padding: 16px 24px;
  border-top: 1px solid var(--border);
}

/* Form */
.form-wrapper {
  margin-bottom: 30px;
}

.form-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  animation: slideDown 0.3s ease;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

.form-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
}

.form-header h2 {
  font-size: 1.2rem;
  font-weight: 600;
}

.close-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
  transition: color 0.2s;
}

.close-btn:hover {
  color: var(--text-primary);
}

form {
  padding: 24px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text-secondary);
}

.required {
  color: var(--danger);
}

.optional {
  color: var(--text-secondary);
  font-weight: 400;
  font-size: 0.85rem;
}

textarea {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: border-color 0.3s, box-shadow 0.3s;
  outline: none;
  resize: vertical;
  font-family: inherit;
  line-height: 1.5;
}

textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

textarea::placeholder {
  color: #4a4a6a;
}

input[type="text"],
input[type="url"],
input[type="datetime-local"] {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: border-color 0.3s, box-shadow 0.3s;
  outline: none;
}

input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

input::placeholder {
  color: #4a4a6a;
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 24px;
}

/* Invitations Section */
.invitations-section {
  margin-top: 10px;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.section-header h2 {
  font-size: 1.2rem;
  font-weight: 600;
}

.count-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
  padding: 0 8px;
  background: var(--accent);
  border-radius: 14px;
  font-size: 0.8rem;
  font-weight: 700;
  color: #fff;
}

/* Invitation Card */
.invitation-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 16px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.invitation-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--accent), #7c4dff);
  opacity: 0.8;
}

.invitation-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(108, 99, 255, 0.15);
  transform: translateX(4px);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 12px;
}

.contest-name {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
}

.card-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.invite-code-group {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.code-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.code-value {
  font-family: 'SF Mono', 'Fira Code', 'Courier New', monospace;
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-light);
  background: rgba(108, 99, 255, 0.1);
  padding: 4px 12px;
  border-radius: 6px;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: background 0.2s;
  user-select: all;
}

.code-value:hover {
  background: rgba(108, 99, 255, 0.2);
}

.copy-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
}

.copy-btn:hover {
  border-color: var(--accent);
  color: var(--accent-light);
  background: rgba(108, 99, 255, 0.1);
}

.invite-remark {
  font-size: 0.9rem;
  color: var(--text-secondary);
  background: rgba(108, 99, 255, 0.06);
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  margin-bottom: 12px;
  line-height: 1.5;
  word-break: break-word;
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
}

.empty-state .empty-icon {
  font-size: 3rem;
  margin-bottom: 16px;
  opacity: 0.5;
}

.empty-state p {
  font-size: 1rem;
}

/* Loading */
.loading {
  text-align: center;
  padding: 40px;
  color: var(--text-secondary);
}

/* Toast */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 24px;
  font-size: 0.9rem;
  color: var(--text-primary);
  z-index: 1000;
  opacity: 0;
  transition: all 0.4s ease;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast.success {
  border-color: var(--success);
}

.toast.error {
  border-color: var(--danger);
}

/* Responsive */
@media (max-width: 640px) {
  .container {
    padding: 20px 12px;
  }

  h1 {
    font-size: 1.5rem;
  }

  .invitation-card {
    padding: 16px;
  }

  .card-header {
    flex-direction: column;
  }

  .card-actions {
    align-self: flex-end;
  }

  .form-actions {
    flex-direction: column;
  }

  .form-actions .btn {
    width: 100%;
    justify-content: center;
  }
}