/* =========================================
   留言板页样式
   ========================================= */
#guestbook-header { padding: 140px 0 40px; text-align: center; }
.guestbook-sub { font-size: clamp(1rem, 2vw, 1.2rem); color: var(--text-secondary); margin: 12px auto 40px; max-width: 600px; }

.transmitter-box {
  background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 20px;
  padding: 32px; backdrop-filter: blur(var(--blur-glass));
  box-shadow: 0 8px 24px rgba(0,0,0,0.3); margin-bottom: 60px; position: relative; overflow: hidden;
}
.transmitter-box::before {
  content: ''; position: absolute; top: -50%; right: -30%; width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(123,104,238,0.15) 0%, transparent 60%); pointer-events: none;
}
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 20px; }
.form-group { position: relative; }
.form-label { display: block; font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 8px; font-weight: 500; }
.form-input, .form-textarea {
  width: 100%; padding: 12px 16px; background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1);
  border-radius: 12px; color: var(--text-primary); font-size: 0.95rem; outline: none; transition: var(--transition);
}
.form-textarea { min-height: 120px; resize: vertical; line-height: 1.7; }
.form-input:focus, .form-textarea:focus { border-color: var(--accent-purple); background: rgba(255,255,255,0.08); box-shadow: 0 0 15px rgba(123,104,238,0.2); }

.submit-wrap { display: flex; justify-content: space-between; align-items: center; }
.freq-hint { font-size: 0.8rem; color: var(--text-secondary); display: flex; align-items: center; gap: 6px; }
.freq-dot { width: 8px; height: 8px; border-radius: 50%; background: #10B981; animation: blink 2s infinite; }
@keyframes blink { 50% { opacity: 0.4; } }

.submit-btn {
  background: var(--gradient-stardust); color: #0A0E27; border: none; padding: 12px 28px;
  border-radius: 30px; font-weight: 600; cursor: pointer; box-shadow: 0 4px 15px rgba(255,215,0,0.3);
  transition: var(--transition); display: flex; align-items: center; gap: 8px;
}
.submit-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(255,215,0,0.5); }
.submit-btn:active { transform: scale(0.97); }
.submit-btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none; box-shadow: none; }

.feed-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.feed-title { font-size: 1.3rem; color: var(--text-primary); }
.msg-count { background: rgba(255,255,255,0.08); padding: 4px 12px; border-radius: 20px; font-size: 0.8rem; color: var(--text-secondary); }

.feed-list { display: flex; flex-direction: column; gap: 20px; margin-bottom: 80px; }
.msg-card {
  background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 16px;
  padding: 24px; backdrop-filter: blur(var(--blur-glass)); position: relative;
  transition: var(--transition);
}
.msg-card:hover { border-color: rgba(123,104,238,0.5); box-shadow: 0 6px 20px rgba(0,0,0,0.3), 0 0 15px rgba(123,104,238,0.15); transform: translateY(-2px); }
.msg-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.msg-author { display: flex; align-items: center; gap: 10px; }
.author-avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: conic-gradient(from 0deg, #7B68EE, #60A5FA, #9370DB, #7B68EE);
  display: flex; align-items: center; justify-content: center; font-weight: bold; color: #fff; font-size: 0.8rem;
}
.author-name { font-weight: 600; color: var(--text-primary); }
.msg-time { font-size: 0.75rem; color: var(--text-secondary); font-family: 'JetBrains Mono', monospace; }
.msg-content { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.7; white-space: pre-wrap; word-break: break-word; }
.msg-footer { margin-top: 16px; padding-top: 12px; border-top: 1px solid rgba(255,255,255,0.05); display: flex; justify-content: space-between; align-items: center; }
.msg-tag { font-size: 0.75rem; padding: 4px 10px; background: rgba(123,104,238,0.15); color: #9370DB; border-radius: 12px; }
.like-btn {
  background: transparent; border: 1px solid rgba(255,255,255,0.1); color: var(--text-secondary);
  padding: 6px 14px; border-radius: 20px; cursor: pointer; font-size: 0.85rem;
  display: flex; align-items: center; gap: 6px; transition: 0.2s;
}
.like-btn:hover { border-color: var(--accent-gold); color: var(--accent-gold); background: rgba(255,215,0,0.1); }
.like-btn.active { border-color: var(--accent-gold); color: var(--accent-gold); background: rgba(255,215,0,0.15); }

.empty-state { text-align: center; padding: 80px 20px; color: var(--text-secondary); }
.empty-icon { font-size: 3rem; margin-bottom: 16px; opacity: 0.6; }

.toast {
  position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: rgba(16,185,129,0.95); color: #fff; padding: 12px 24px; border-radius: 30px;
  font-weight: 500; box-shadow: 0 8px 20px rgba(0,0,0,0.3); opacity: 0; visibility: hidden;
  transition: 0.3s ease; z-index: 1000; backdrop-filter: blur(8px);
}
.toast.show { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }

@keyframes ripple { 0% { transform: scale(0); opacity: 0.8; } 100% { transform: scale(4); opacity: 0; } }
.ripple { position: absolute; border-radius: 50%; background: rgba(255,215,0,0.4); pointer-events: none; animation: ripple 0.8s ease-out forwards; width: 10px; height: 10px; top: 0; left: 0; }

/* =========================================
   响应式调整
   ========================================= */
@media (max-width: 768px) {
  .form-grid { grid-template-columns: 1fr; }
  .submit-wrap { flex-direction: column; gap: 16px; align-items: flex-start; }
  #guestbook-header { padding-top: 110px; }
  .container { width: 95%; }
}