/**
 * 通用样式
 * 包含：CSS变量、重置样式、通用组件
 */

/* ========== CSS 变量 ========== */
:root {
  /* 主题色 */
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --success: #16a34a;
  --error: #dc2626;
  --warning: #d97706;
  
  /* 背景色 */
  --bg: #0f172a;
  --card-bg: #1e293b;
  --card-border: #334155;
  --input-bg: #0f172a;
  --input-border: #475569;
  
  /* 文字色 */
  --text: #f1f5f9;
  --text-muted: #94a3b8;
}

/* ========== 重置样式 ========== */
* { 
  box-sizing: border-box; 
  margin: 0; 
  padding: 0; 
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

/* ========== Logo 样式 ========== */
.logo {
  font-size: 28px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}
.logo span { 
  display: inline-block; 
  transition: transform 0.2s; 
}
.logo span:hover { 
  transform: scale(1.1); 
}
.logo-1 { color: #f472b6; }
.logo-2 { color: #fb923c; }
.logo-3 { color: #facc15; }
.logo-4 { color: #4ade80; }
.logo-5 { color: #22d3ee; }
.logo-6 { color: #818cf8; }
.logo-7 { color: #e879f9; }

.subtitle {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 32px;
  text-align: center;
}

/* ========== 卡片样式 ========== */
.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 32px;
  width: 100%;
  max-width: 460px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}

.card-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ========== 表单样式 ========== */
.form-group { 
  margin-bottom: 18px; 
}

label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

input[type="text"] {
  width: 100%;
  padding: 12px 14px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 8px;
  color: var(--text);
  font-size: 15px;
  font-family: 'Courier New', monospace;
  letter-spacing: 1px;
  transition: border-color 0.2s;
  outline: none;
}
input[type="text"]:focus { 
  border-color: var(--primary); 
}
input[type="text"]::placeholder { 
  color: #475569; 
  font-family: inherit; 
  letter-spacing: normal; 
}

/* ========== 按钮样式 ========== */
.btn {
  width: 100%;
  padding: 13px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.btn:hover:not(:disabled) { 
  background: var(--primary-hover); 
}
.btn:active:not(:disabled) { 
  transform: scale(0.98); 
}
.btn:disabled { 
  opacity: 0.5; 
  cursor: not-allowed; 
}

.reset-btn {
  background: none;
  border: 1px solid var(--card-border);
  color: var(--text-muted);
  padding: 9px 18px;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  margin-top: 12px;
  transition: all 0.2s;
  display: block;
  width: 100%;
}
.reset-btn:hover { 
  border-color: var(--text-muted); 
  color: var(--text); 
}

/* ========== 分割线 ========== */
.divider {
  height: 1px;
  background: var(--card-border);
  margin: 24px 0;
}

/* ========== 提示框 ========== */
.alert {
  padding: 11px 14px;
  border-radius: 8px;
  font-size: 13px;
  margin-bottom: 16px;
  display: none;
}
.alert.error { 
  background: #450a0a33; 
  border: 1px solid #dc2626; 
  color: #f87171; 
}
.alert.success { 
  background: #14532d33; 
  border: 1px solid #16a34a; 
  color: #4ade80; 
}

/* ========== 加载动画 ========== */
.spinner {
  width: 16px; 
  height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}
@keyframes spin { 
  to { transform: rotate(360deg); } 
}

.dot-pulse {
  width: 8px; 
  height: 8px;
  border-radius: 50%;
  background: currentColor;
  animation: pulse 1.2s ease-in-out infinite;
  flex-shrink: 0;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}