@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Noto+Sans+SC:wght@400;500;600;700&display=swap');

/* =========================================
   1. 现代 SaaS 风格主题变量
========================================= */
:root {
  /* 明亮模式 - 极简白与浅灰 */
  --bg-base: #f8fafc;
  --bg-surface: #ffffff;
  --bg-input: #f1f5f9;

  --border-subtle: #e2e8f0;
  --border-strong: #cbd5e1;

  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --text-placeholder: #94a3b8;

  --brand-primary: #4f46e5;
  --brand-primary-hover: #4338ca;
  --brand-primary-alpha: rgba(79, 70, 229, 0.1);

  --status-error: #ef4444;
  --status-success: #10b981;

  /* 现代柔和扩散阴影 */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.01);

  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
}

html.dark {
  /* 暗黑模式 - 深邃黑与暗石板色 */
  --bg-base: #020617;
  --bg-surface: #0f172a;
  --bg-input: #1e293b;

  --border-subtle: #1e293b;
  --border-strong: #334155;

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-placeholder: #475569;

  --brand-primary: #6366f1;
  --brand-primary-hover: #818cf8;
  --brand-primary-alpha: rgba(99, 102, 241, 0.15);

  --status-error: #f87171;

  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
}

/* =========================================
   2. 全局重置与排版基准
========================================= */
*, *::before, *::after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  font-family: 'Inter', 'Noto Sans SC', sans-serif;
  background-color: var(--bg-base);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
}

#app {
  min-height: 100vh;
  background: transparent;
  position: relative;
  z-index: 1;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

/* =========================================
   高级背景环境光与数据网格
========================================= */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -2;
  /* 绘制点阵网格 */
  background-image: radial-gradient(var(--border-strong) 1px, transparent 1px);
  background-size: 24px 24px;
  /* 使用遮罩让网格在四周自然淡出，避免边缘生硬 */
  mask-image: radial-gradient(ellipse 80% 80% at 50% -20%, black 20%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% -20%, black 20%, transparent 80%);
  opacity: 0.4;
  pointer-events: none;
}

html.dark body::before {
  opacity: 0.15;
}

/* 极弱的雷达扫射呼吸环境光 */
body::after {
  content: '';
  position: fixed;
  top: -50%;
  left: -20%;
  right: -20%;
  height: 100vh;
  z-index: -3;
  background: radial-gradient(ellipse at bottom, var(--brand-primary-alpha) 0%, transparent 60%);
  opacity: 0.6;
  pointer-events: none;
  animation: ambient-pulse 8s ease-in-out infinite alternate;
}

@keyframes ambient-pulse {
  0% {
    transform: scale(1);
    opacity: 0.4;
  }
  100% {
    transform: scale(1.05);
    opacity: 0.7;
  }
}

/* =========================================
   3. 现代表单控件体系
========================================= */
.input-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}

.input-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-field {
  width: 100%;
  padding: 12px 14px;
  background-color: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 15px;
  transition: all 0.2s ease;
}

.input-field::placeholder {
  color: var(--text-placeholder);
}

.input-field:hover {
  border-color: var(--border-strong);
}

.input-field:focus {
  outline: none;
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px var(--brand-primary-alpha);
  background-color: var(--bg-surface);
}

.input-action-btn {
  position: absolute;
  right: 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--brand-primary);
  padding: 4px 8px;
  border-radius: 4px;
  transition: background 0.2s;
}

.input-action-btn:hover:not(:disabled) {
  background: var(--brand-primary-alpha);
}

.input-action-btn:disabled {
  color: var(--text-placeholder);
  cursor: not-allowed;
}

.btn-primary {
  width: 100%;
  padding: 12px;
  background-color: var(--brand-primary);
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  display: flex;
  justify-content: center;
  align-items: center;
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--brand-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}