/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #4f46e5;
    --primary-light: #6366f1;
    --primary-dark: #4338ca;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-light: #64748b;
    --border: #e2e8f0;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --radius: 12px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.08);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

/* 三栏布局 */
.layout {
    display: flex;
    width: 100%;
    max-width: 1600px;
    margin: 0 auto;
    min-height: 100vh;
}

/* 左右广告栏 */
.ad-sidebar {
    width: 200px;
    flex-shrink: 0;
    min-height: 100vh;
    position: sticky;
    top: 0;
    align-self: flex-start;
}

/* 主内容区 */
.main-content {
    flex: 1;
    min-width: 0;
    max-width: 1000px;
    margin: 0 auto;
    padding: 32px 24px;
}

/* 底部容器 */
.ad-footer {
    width: 100%;
}

/* 头部 */
.header {
    text-align: center;
    margin-bottom: 40px;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.header .subtitle {
    color: var(--text-light);
    font-size: 1.05rem;
    max-width: 640px;
    margin: 0 auto;
}

/* 特性卡片 */
.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.feature-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 28px 20px;
    text-align: center;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 2.2rem;
    margin-bottom: 12px;
}

.feature-card h3 {
    font-size: 1.1rem;
    margin-bottom: 6px;
    color: var(--text);
}

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

/* 计算区域 */
.calculator {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 40px;
}

.panel {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.panel-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text);
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border);
}

.panel-title.mt {
    margin-top: 24px;
}

/* 文本输入框 */
#textInput {
    width: 100%;
    min-height: 200px;
    padding: 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: inherit;
    resize: vertical;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    line-height: 1.6;
}

#textInput:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.input-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-top: 10px;
    font-size: 0.85rem;
    color: var(--text-light);
}

.input-meta button {
    margin-left: auto;
}

/* 服务商选择 */
.provider-select {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
    background: var(--card-bg);
    color: var(--text);
    cursor: pointer;
    outline: none;
    transition: border-color 0.2s;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 8L2 4h8z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
}

.provider-select:focus {
    border-color: var(--primary);
}

.price-hint {
    margin-top: 8px;
    font-size: 0.85rem;
    color: var(--text-light);
}

/* 结果区 */
.result-content {
    min-height: 200px;
}

.result-empty {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-light);
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.result-empty h3 {
    font-size: 1.1rem;
    color: var(--text);
    margin-bottom: 8px;
}

.result-empty p {
    font-size: 0.9rem;
}

.result-stats {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.stat-block {
    background: var(--bg);
    border-radius: 10px;
    padding: 18px;
    border: 1px solid var(--border);
}

.stat-block.primary {
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.05) 0%, rgba(99, 102, 241, 0.05) 100%);
    border-color: rgba(79, 70, 229, 0.2);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 6px;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
}

.stat-value.small {
    font-size: 1.2rem;
}

.stat-detail {
    font-size: 0.8rem;
    color: var(--text-light);
    margin-top: 4px;
}

.cost-breakdown {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.cost-item {
    background: var(--bg);
    border-radius: 10px;
    padding: 14px;
    text-align: center;
    border: 1px solid var(--border);
}

.cost-item .cost-label {
    font-size: 0.8rem;
    color: var(--text-light);
    margin-bottom: 4px;
}

.cost-item .cost-value {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--success);
}

.cost-item.output .cost-value {
    color: var(--warning);
}

.total-cost {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #fff;
    border-radius: 10px;
    padding: 18px;
    text-align: center;
}

.total-cost .cost-label {
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.85rem;
    margin-bottom: 6px;
}

.total-cost .cost-value {
    font-size: 1.8rem;
    font-weight: 800;
    color: #fff;
}

/* 价格对比 */
.price-comparison {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    margin-bottom: 40px;
}

.section-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text);
}

.comparison-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    color: var(--text-light);
    font-size: 0.95rem;
}

.provider-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.provider-card {
    background: var(--bg);
    border-radius: 10px;
    padding: 18px;
    border: 1px solid var(--border);
    transition: transform 0.2s, box-shadow 0.2s;
    cursor: pointer;
}

.provider-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.provider-card.active {
    border-color: var(--primary);
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.04) 0%, rgba(99, 102, 241, 0.04) 100%);
}

.provider-card-name {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 4px;
    color: var(--text);
}

.provider-card-desc {
    font-size: 0.8rem;
    color: var(--text-light);
    margin-bottom: 12px;
}

.provider-card-price {
    display: flex;
    gap: 16px;
    font-size: 0.85rem;
}

.provider-card-price span {
    color: var(--text-light);
}

.provider-card-price strong {
    color: var(--text);
}

.provider-card-delete {
    margin-top: 12px;
    width: 100%;
}

/* 弹层遮罩 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}

.modal-dialog {
    background: var(--card-bg);
    border-radius: var(--radius);
    width: 100%;
    max-width: 480px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    overflow: hidden;
    animation: modalIn 0.2s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.97);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 24px;
    border-bottom: 1px solid var(--border);
}

.modal-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.6rem;
    line-height: 1;
    color: var(--text-light);
    cursor: pointer;
    padding: 0 4px;
    transition: color 0.2s;
}

.modal-close:hover {
    color: var(--text);
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    padding: 18px 24px;
    border-top: 1px solid var(--border);
}

.form-row {
    margin-bottom: 16px;
}

.form-row label {
    display: block;
    font-size: 0.9rem;
    color: var(--text);
    margin-bottom: 6px;
    font-weight: 600;
}

.form-row input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s;
}

.form-row input:focus {
    border-color: var(--primary);
}

.form-row-double {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-actions {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

/* 按钮 */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    background: var(--primary);
    color: #fff;
    transition: background 0.2s, transform 0.1s;
}

.btn:hover {
    background: var(--primary-dark);
}

.btn:active {
    transform: scale(0.97);
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.82rem;
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: #fff;
}

.btn-danger {
    background: transparent;
    color: var(--danger);
    border: 1px solid var(--danger);
    padding: 6px 14px;
    font-size: 0.82rem;
}

.btn-danger:hover {
    background: var(--danger);
    color: #fff;
}

/* SEO 内容区 */
.seo-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 24px 20px 40px;
    color: #374151;
    font-size: 0.9rem;
    line-height: 1.9;
}

.seo-content h2 {
    font-size: 1.05rem;
    color: #1f2937;
    margin: 22px 0 10px;
    padding-left: 10px;
    border-left: 3px solid var(--primary);
}

.seo-content h2:first-child {
    margin-top: 0;
}

.seo-content h3 {
    font-size: 0.9rem;
    color: #1f2937;
    margin: 14px 0 4px;
}

.seo-content ul,
.seo-content ol {
    padding-left: 22px;
}

.seo-content li {
    margin-bottom: 4px;
}

/* 使用说明 */
.instructions {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    margin-bottom: 40px;
}

.instructions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.instruction-card {
    background: var(--bg);
    border-radius: 10px;
    padding: 20px;
    border: 1px solid var(--border);
}

.instruction-card h3 {
    font-size: 1rem;
    margin-bottom: 12px;
    color: var(--text);
}

.instruction-card ol,
.instruction-card ul {
    padding-left: 20px;
    color: var(--text-light);
    font-size: 0.88rem;
    line-height: 1.8;
}

.instruction-card li {
    margin-bottom: 4px;
}

/* 工具类 */
.hidden {
    display: none !important;
}

/* 响应式：屏幕宽度 ≤1200px 隐藏左右广告栏 */
@media (max-width: 1200px) {
    .ad-sidebar {
        display: none;
    }

    .main-content {
        max-width: 1000px;
        padding: 32px 20px;
    }
}

/* 平板适配 */
@media (max-width: 768px) {
    .header h1 {
        font-size: 1.8rem;
    }

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

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

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

    .form-row-double {
        grid-template-columns: 1fr;
    }

    .main-content {
        padding: 20px 16px;
    }

    .cost-breakdown {
        grid-template-columns: 1fr 1fr;
    }
}

/* 手机适配 */
@media (max-width: 480px) {
    .header h1 {
        font-size: 1.5rem;
    }

    .cost-breakdown {
        grid-template-columns: 1fr;
    }
}