/* BMI 计算器样式 */

:root {
    --primary-color: #10b981;
    --primary-hover: #34d399;
    --primary-light: rgba(16, 185, 129, 0.08);
    --primary-light-hover: rgba(16, 185, 129, 0.12);
    --border-color-hover: rgba(16, 185, 129, 0.2);
    --shadow-primary: 0 0 16px rgba(16, 185, 129, 0.15);
}

html, body { height: 100%; overflow-y: auto; overflow-x: hidden; margin: 0; }
body { display: flex; align-items: flex-start; justify-content: center; padding-top: 70px; padding-bottom: 70px; min-height: 100vh; }
.logo-icon { background: linear-gradient(135deg, var(--primary-color) 0%, #047857 100%); }
.main-content { width: 100%; max-width: 600px; padding: 20px; z-index: 10; }
.tool-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-xl); overflow: hidden; box-shadow: 0 20px 40px rgba(0,0,0,0.3); }

.form-section { padding: 20px 16px; }
.form-row { display: flex; gap: 12px; margin-bottom: 14px; }
.form-group.half { flex: 1; }
.field-label { display: block; font-size: 13px; color: var(--text-secondary); margin-bottom: 6px; }
.input-field, .select-wide {
    width: 100%; padding: 10px 14px; background: rgba(0,0,0,0.2); border: 1px solid var(--border-color);
    border-radius: var(--radius-md); color: var(--text-primary); font-size: 14px; outline: none;
}
.input-field:focus, .select-wide:focus { border-color: var(--primary-color); }

.action-bar { display: flex; gap: 10px; padding: 0 16px 16px; flex-wrap: wrap; }
.btn-action {
    padding: 10px 20px; border-radius: var(--radius-md); border: 1px solid var(--border-color);
    background: rgba(255,255,255,0.05); color: var(--text-secondary); cursor: pointer; font-size: 13px;
    display: flex; align-items: center; gap: 6px; transition: 0.2s;
}
.btn-action:hover { background: rgba(255,255,255,0.1); color: var(--text-primary); }
.btn-calculate { background: rgba(16, 185, 129, 0.2); border-color: rgba(16, 185, 129, 0.3); color: #34d399; }
.btn-calculate:hover { background: rgba(16, 185, 129, 0.3); }
.btn-clear { background: rgba(156, 163, 175, 0.1); border-color: rgba(156, 163, 175, 0.2); color: #9ca3af; }
.btn-clear:hover { background: rgba(156, 163, 175, 0.2); }

.result-section { margin: 0 16px 16px; }
.bmi-display { text-align: center; padding: 24px 16px; background: rgba(0,0,0,0.15); border-radius: var(--radius-lg); margin-bottom: 20px; }
.bmi-value { font-size: 56px; font-weight: 700; color: var(--text-primary); line-height: 1; }
.bmi-category { font-size: 18px; margin-top: 8px; font-weight: 600; }
.bmi-category.underweight { color: #60a5fa; }
.bmi-category.normal { color: #34d399; }
.bmi-category.overweight { color: #fbbf24; }
.bmi-category.obese { color: #f97316; }
.bmi-category.severe { color: #ef4444; }

.bmi-bar-container { padding: 0 4px; margin-bottom: 20px; }
.bmi-bar { position: relative; height: 12px; border-radius: 6px; overflow: hidden; background: linear-gradient(to right, #60a5fa 0%, #34d399 18.5%, #34d399 23.9%, #fbbf24 24%, #fbbf24 27.9%, #f97316 28%, #f97316 39.9%, #ef4444 40%); }
.bmi-indicator { position: absolute; top: -4px; width: 4px; height: 20px; background: #fff; border-radius: 2px; transform: translateX(-50%); transition: left 0.5s ease; box-shadow: 0 0 6px rgba(0,0,0,0.5); }
.bmi-bar-labels { display: flex; justify-content: space-between; font-size: 11px; color: var(--text-muted); margin-top: 6px; }

.bmi-info-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.bmi-info-item { background: rgba(0,0,0,0.1); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 12px; text-align: center; }
.info-label { display: block; font-size: 12px; color: var(--text-muted); margin-bottom: 4px; }
.info-value { display: block; font-size: 16px; font-weight: 600; color: var(--primary-color); font-family: var(--font-mono); }

@media (max-width: 480px) {
    .main-content { padding: 10px; }
    .form-row { flex-direction: column; }
    .bmi-info-grid { grid-template-columns: 1fr; }
    .bmi-value { font-size: 42px; }
}