/* ========== 农机约车 - 设计系统 ========== */

/* ---- 色彩 ---- */
:root {
  --color-primary: #15803d;
  --color-primary-light: #22c55e;
  --color-primary-bg: #f0fdf4;
  --color-primary-border: rgba(22, 163, 74, 0.25);
  --color-text: #111827;
  --color-text-secondary: #4b5563;
  --color-text-tertiary: #9ca3af;
  --color-border: #e5e7eb;
  --color-border-light: #f3f4f6;
  --color-bg: #f8faf9;
  --color-card: #ffffff;
  --color-overlay: #f3f4f6;
  --safe-bottom: env(safe-area-inset-bottom, 0);
}

/* ---- 间距（8px 网格）---- */
:root {
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-base: 16px;
  --space-lg: 20px;
  --space-xl: 24px;
  --space-2xl: 32px;
  --space-3xl: 40px;
  --space-4xl: 48px;
  --space-5xl: 56px;
  --page-pad: 16px;
  --card-pad: 20px;
  --card-radius: 12px;
  --card-radius-sm: 10px;
}

/* ---- 字体 ---- */
:root {
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --text-caption: 11px;
  --text-xs: 12px;
  --text-sm: 13px;
  --text-base: 14px;
  --text-md: 15px;
  --text-subhead: 17px;
  --text-title: 18px;
  --text-headline: 20px;
  --text-display: 24px;
  --leading-tight: 1.35;
  --leading-normal: 1.5;
  --leading-relaxed: 1.6;
  --tracking-tight: -0.01em;
  --tracking-normal: 0;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  letter-spacing: var(--tracking-normal);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-tap-highlight-color: transparent;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--color-primary); text-decoration: none; }
img { max-width: 100%; vertical-align: middle; }

/* ---- 顶部导航 ---- */
.app-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 48px;
  padding: 0 var(--page-pad);
  background: var(--color-card);
  border-bottom: 1px solid var(--color-border);
}
.app-header .back {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin: 0 -8px 0 0;
  color: var(--color-text);
  border: none;
  background: none;
  cursor: pointer;
  border-radius: 50%;
}
.app-header .back:active { background: var(--color-overlay); }
.app-header .title {
  font-size: var(--text-subhead);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  flex: 1;
  text-align: center;
  line-height: var(--leading-tight);
}
.app-header .right { width: 40px; }

/* ---- 底部导航 ---- */
.app-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  padding: var(--space-sm) 0 calc(var(--space-sm) + var(--safe-bottom));
  background: var(--color-card);
  border-top: 1px solid var(--color-border);
  box-shadow: 0 -1px 3px rgba(0,0,0,0.04);
}
.app-nav a {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-xs) 0;
  font-size: var(--text-caption);
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--color-text-tertiary);
  transition: color 0.15s ease;
}
.app-nav a.active {
  color: var(--color-primary);
  font-weight: 600;
}
.app-nav .icon-wrap {
  margin-bottom: var(--space-xs);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ---- 主内容区 ---- */
.has-nav { padding-bottom: 64px; }
.page-pad { padding: var(--page-pad); }
.page-pad-lg { padding: var(--page-pad) var(--page-pad) var(--space-2xl); }
/* 内容区最大宽度，大屏下保持可读性 */
.content-max { max-width: 420px; margin-left: auto; margin-right: auto; }

/* ---- 卡片与列表 ---- */
.card {
  background: var(--color-card);
  border-radius: var(--card-radius);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
  overflow: hidden;
}
.list-item {
  display: flex;
  align-items: center;
  padding: var(--space-base) var(--page-pad);
  background: var(--color-card);
  border-bottom: 1px solid var(--color-border-light);
}
.list-item:last-child { border-bottom: none; }

/* ---- 按钮 ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 var(--space-lg);
  font-family: inherit;
  font-size: var(--text-md);
  font-weight: 500;
  letter-spacing: 0.02em;
  border: none;
  border-radius: var(--card-radius-sm);
  cursor: pointer;
  transition: opacity 0.2s, transform 0.1s;
}
.btn:active { opacity: 0.9; transform: scale(0.99); }
.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 2px 4px rgba(21, 128, 61, 0.2);
}
.btn-primary:disabled { background: var(--color-text-tertiary); cursor: not-allowed; box-shadow: none; }
.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}
.btn-block { width: 100%; }

/* ---- 表单 ---- */
.form-group { margin-bottom: var(--space-lg); }
.form-label {
  display: block;
  margin-bottom: var(--space-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  letter-spacing: var(--tracking-tight);
}
.form-input,
.form-select,
.form-textarea {
  width: 100%;
  min-height: 44px;
  padding: 0 var(--space-base);
  font-family: inherit;
  font-size: var(--text-md);
  line-height: var(--leading-normal);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius-sm);
  background: var(--color-card);
  transition: border-color 0.15s;
}
.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}
.form-textarea {
  min-height: 96px;
  padding: var(--space-base);
  resize: vertical;
}

/* ---- 状态标签 ---- */
.status-tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.02em;
  border-radius: 6px;
  line-height: 1.4;
}
.status-pending { background: #fef3c7; color: #92400e; }
.status-accepted { background: #dbeafe; color: #1e40af; }
.status-signed { background: #e0e7ff; color: #3730a3; }
.status-review { background: #fce7f3; color: #9d174d; }
.status-done { background: #d1fae5; color: #065f46; }
.status-cancelled { background: #f3f4f6; color: #6b7280; }

/* ---- 图标 ---- */
.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.icon svg { width: 100%; height: 100%; fill: currentColor; }
.icon-sm { width: 18px; height: 18px; }
.icon-md { width: 22px; height: 22px; }
.icon-lg { width: 28px; height: 28px; }
.icon-xl { width: 32px; height: 32px; }