/* ============================================
   锌钢护栏计算器 - 响应式样式
   ============================================ */

:root {
    /* 主色调 */
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;

    /* 强调色 */
    --accent: #10b981;
    --accent-light: #34d399;
    --warning: #f59e0b;

    /* 背景色 */
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --bg-input: #334155;

    /* 文字色 */
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    /* 边框 */
    --border: #475569;

    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, var(--bg-dark) 0%, #1a1a2e 50%, #16213e 100%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
    /* 禁用 iOS 橡皮筋滚动效果 */
    overscroll-behavior: none;
    -webkit-overflow-scrolling: auto;
}

/* 防止 html 和 body 的弹性滚动 */
html {
    overscroll-behavior: none;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* ============================================
   Header
   ============================================ */
.header {
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-bottom: var(--spacing-lg);
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* ============================================
   Cards
   ============================================ */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--primary);
    display: inline-block;
}

/* ============================================
   Material Grid (原材料三列布局)
   ============================================ */
.material-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.material-item {
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    border: 1px solid var(--border);
}

.material-item h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-light);
    margin-bottom: var(--spacing-md);
    text-align: center;
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border);
}

/* ============================================
   Fee Grid (费用多列布局)
   ============================================ */
.fee-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--spacing-md);
}

.fee-grid.two-cols {
    grid-template-columns: repeat(2, 1fr);
}

/* ============================================
   Input Groups
   ============================================ */
.input-group {
    margin-bottom: var(--spacing-md);
}

.input-group label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.input-with-suffix {
    display: flex;
    align-items: center;
    background: var(--bg-input);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.input-with-suffix:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.input-with-suffix input {
    flex: 1;
    background: transparent;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    color: #ffffff;
    /* iOS Safari 需要至少 16px 字体才不会自动缩放 */
    font-size: 16px;
    font-weight: 600;
    min-width: 0;
    /* 禁用 iOS 输入框样式 */
    -webkit-appearance: none;
    appearance: none;
    border-radius: 0;
}

.input-with-suffix input:focus {
    outline: none;
}

.input-with-suffix .suffix {
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(99, 102, 241, 0.3);
    color: #ffffff;
    font-size: 0.9rem;
    font-weight: 600;
    white-space: nowrap;
}

/* ============================================
   Result Rows (单项结果)
   ============================================ */
.result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    border-top: 1px dashed var(--border);
    font-size: 0.9rem;
}

.result-value {
    font-weight: 600;
    color: var(--text-primary);
}

.result-value.highlight {
    color: var(--accent-light);
}

/* ============================================
   Section Summary (区域汇总)
   ============================================ */
.section-summary {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 2px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.summary-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.summary-item span:first-child {
    color: var(--text-secondary);
}

.summary-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent-light);
}

/* ============================================
   Final Results Card
   ============================================ */
.result-card {
    background: linear-gradient(135deg, var(--bg-card), rgba(99, 102, 241, 0.1));
    border: 2px solid var(--primary);
}

.final-results {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.result-item {
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    border: 1px solid var(--border);
}

.result-item.primary {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    border-color: var(--primary-light);
}

.result-item.accent {
    background: linear-gradient(135deg, #065f46, var(--accent));
    border-color: var(--accent-light);
}

.result-label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.result-item.primary .result-label,
.result-item.accent .result-label {
    color: rgba(255, 255, 255, 0.8);
}

.result-number {
    font-size: 1.5rem;
    font-weight: 700;
}

.result-number.large {
    font-size: 1.5rem;
}

/* ============================================
   Export Button
   ============================================ */
.export-section {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.export-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.1rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.export-btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 15px 35px rgba(99, 102, 241, 0.4);
}

.export-btn:active {
    transform: translateY(0);
}

.export-btn.loading {
    opacity: 0.7;
    cursor: wait;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    text-align: center;
    padding: var(--spacing-xl) 0;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ============================================
   响应式设计 - 平板
   ============================================ */
@media (max-width: 992px) {
    .material-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .fee-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ============================================
   响应式设计 - 手机
   ============================================ */
@media (max-width: 640px) {
    .container {
        padding: var(--spacing-sm);
    }

    .header h1 {
        font-size: 1.5rem;
    }

    .card {
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-md);
    }

    .material-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .fee-grid {
        grid-template-columns: 1fr;
    }

    .fee-grid.two-cols {
        grid-template-columns: 1fr;
    }

    .section-summary {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: stretch;
    }

    .summary-item {
        justify-content: space-between;
        padding: var(--spacing-sm);
        background: rgba(0, 0, 0, 0.2);
        border-radius: var(--radius-md);
    }

    .final-results {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .result-number {
        font-size: 1.25rem;
    }

    .result-number.large {
        font-size: 1.75rem;
    }

    .input-with-suffix input {
        padding: var(--spacing-sm);
        font-size: 0.9rem;
    }

    .input-with-suffix .suffix {
        padding: var(--spacing-sm);
        font-size: 0.8rem;
    }
}

/* ============================================
   动画效果
   ============================================ */
@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }
}

.result-number {
    animation: pulse 2s ease-in-out infinite;
}

/* 数字输入框去除上下箭头 */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    appearance: none;
    margin: 0;
}

input[type="number"] {
    -moz-appearance: textfield;
}

/* 选中效果 */
::selection {
    background: var(--primary);
    color: white;
}