/* HowToDo - 生活小帮手 样式表 */
/* 配色方案: 莫兰迪色系 - 柔和舒适 */

:root {
    /* 主色调 - 雾霾蓝 */
    --primary: #6B8E9F;
    --primary-dark: #5A7A89;
    --primary-light: #8BA5B3;
    
    /* 辅助色 - 灰绿 */
    --secondary: #A8B5A0;
    --secondary-light: #C5CDB8;
    
    /* 强调色 - 灰粉 */
    --accent: #D4A5A5;
    --accent-light: #E3C4C4;
    
    /* 背景色 */
    --bg: #F5F3F0;
    --card-bg: #FFFFFF;
    --bg-alt: #EDEAE6;
    
    /* 文字色 */
    --text: #4A4A4A;
    --text-light: #6B6B6B;
    --text-muted: #999999;
    
    /* 阴影 */
    --shadow: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-hover: 0 4px 16px rgba(0,0,0,0.1);
    --shadow-soft: 0 4px 20px rgba(107, 142, 159, 0.15);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header - 使用柔和的渐变 */
header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 50px 0;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 600;
    letter-spacing: 2px;
}

.tagline {
    font-size: 1.1rem;
    opacity: 0.85;
    font-weight: 300;
}

/* Hero */
.hero {
    text-align: center;
    padding: 60px 0 40px;
}

.hero h2 {
    font-size: 1.8rem;
    margin-bottom: 12px;
    color: var(--text);
    font-weight: 500;
}

.hero p {
    color: var(--text-light);
    font-size: 1.05rem;
}

/* Tools Grid */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    padding: 20px 0 60px;
}

.tool-card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 35px 25px;
    text-align: center;
    text-decoration: none;
    color: var(--text);
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-light);
}

.tool-icon {
    font-size: 3rem;
    margin-bottom: 18px;
    display: block;
}

.tool-card h3 {
    font-size: 1.25rem;
    margin-bottom: 10px;
    color: var(--primary);
    font-weight: 600;
}

.tool-card p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Features */
.features {
    padding: 60px 0;
    text-align: center;
    background: var(--bg-alt);
    border-radius: 30px;
    margin: 40px 0;
}

.features h2 {
    font-size: 1.6rem;
    margin-bottom: 40px;
    color: var(--text);
    font-weight: 500;
}

.feature-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    max-width: 900px;
    margin: 0 auto;
}

.feature {
    padding: 20px;
}

.feature-icon {
    font-size: 2.2rem;
    display: block;
    margin-bottom: 15px;
}

.feature h4 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--primary);
}

.feature p {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Footer */
footer {
    background: var(--text);
    color: rgba(255,255,255,0.8);
    text-align: center;
    padding: 40px 0;
    margin-top: 60px;
}

footer p {
    margin: 5px 0;
    font-size: 0.95rem;
}

/* Tool Pages */
.tool-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 40px 0;
    text-align: center;
}

.tool-header h1 {
    font-size: 1.8rem;
    font-weight: 500;
}

.tool-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
}

.tool-box {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 35px;
    box-shadow: var(--shadow);
    margin-bottom: 25px;
}

.tool-box h3 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: var(--text);
    font-weight: 500;
}

.input-group {
    margin-bottom: 22px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text);
    font-size: 0.95rem;
}

.input-group input,
.input-group select,
.input-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid #E8E5E0;
    border-radius: 12px;
    font-size: 1rem;
    transition: all 0.3s;
    background: var(--bg);
    color: var(--text);
}

.input-group input:focus,
.input-group select:focus,
.input-group textarea:focus {
    outline: none;
    border-color: var(--primary-light);
    background: var(--card-bg);
}

.btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 14px 32px;
    border-radius: 12px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s;
    width: 100%;
    font-weight: 500;
}

.btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-soft);
}

.result-box {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
    color: white;
    padding: 30px;
    border-radius: 16px;
    margin-top: 25px;
    display: none;
}

.result-box.show {
    display: block;
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.back-link {
    display: inline-block;
    margin-top: 25px;
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    padding: 10px 20px;
    border-radius: 8px;
    transition: all 0.3s;
}

.back-link:hover {
    background: var(--bg-alt);
    text-decoration: none;
}

/* 工具特定样式 - 柔和版本 */
.count-display {
    text-align: center;
    padding: 35px;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
    color: white;
    border-radius: 20px;
    margin-top: 20px;
}

.count-number {
    font-size: 3.5rem;
    font-weight: 600;
    margin: 15px 0;
}

.count-label {
    font-size: 1.1rem;
    opacity: 0.9;
}

.bmi-result {
    text-align: center;
    padding: 35px;
    border-radius: 20px;
    margin-top: 20px;
    color: white;
}

.bmi-underweight { background: linear-gradient(135deg, #8FA5B8 0%, #6B8E9F 100%); }
.bmi-normal { background: linear-gradient(135deg, #A8B5A0 0%, #8FA08A 100%); }
.bmi-overweight { background: linear-gradient(135deg, #D4B896 0%, #C4A57A 100%); }
.bmi-obese { background: linear-gradient(135deg, #D4A5A5 0%, #C48A8A 100%); }

.timer-display {
    text-align: center;
    padding: 50px 30px;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
    color: white;
    border-radius: 24px;
    margin: 30px 0;
}

.timer-time {
    font-size: 4.5rem;
    font-weight: 300;
    font-family: 'Courier New', monospace;
    letter-spacing: 8px;
}

/* 按钮样式 - 柔和 */
.count-type-btn,
.loan-type-btn,
.mode-btn,
.mode-tab {
    padding: 10px 20px;
    border: 2px solid #E8E5E0;
    background: var(--card-bg);
    color: var(--text);
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 0.95rem;
}

.count-type-btn.active,
.loan-type-btn.active,
.mode-btn.active,
.mode-tab.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.count-type-btn:hover,
.loan-type-btn:hover,
.mode-btn:hover,
.mode-tab:hover {
    border-color: var(--primary-light);
}

/* 表格样式 */
.bmi-table,
.schedule-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

.bmi-table th,
.schedule-table th {
    background: var(--bg-alt);
    padding: 14px;
    text-align: center;
    font-weight: 500;
    color: var(--text);
}

.bmi-table td,
.schedule-table td {
    padding: 12px;
    text-align: center;
    border-bottom: 1px solid #E8E5E0;
    color: var(--text-light);
}

/* 响应式 */
@media (max-width: 768px) {
    header {
        padding: 35px 0;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .hero h2 {
        font-size: 1.4rem;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .tool-card {
        padding: 25px 20px;
    }
    
    .timer-time {
        font-size: 3rem;
        letter-spacing: 4px;
    }
    
    .count-number {
        font-size: 2.5rem;
    }
}