/* =============================================
 * COMMON.CSS - 思益云网站共用样式
 * 包含颜色变量、基础样式和可复用组件
 * ============================================= */


/* CSS 变量定义 - 颜色方案 */

:root {
    /* 主色调 */
    --pri: #0ea5e9;
    --sec: #6366f1;
    --accent: #ff0080;
    /* 背景色 */
    --bg-light: #ffffff;
    --bg-dark: #0f172a;
    --bg-card: #ffffff;
    /* 文字色 */
    --ink-dark: #0f172a;
    --ink-light: #ffffff;
    --muted: #64748b;
    --muted-light: #94a3b8;
    /* 边框和线条 */
    --line: #e2e8f0;
    --line-dark: #334155;
    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, var(--pri), var(--sec));
    --gradient-accent: linear-gradient(135deg, var(--sec), var(--accent));
}


/* 基础重置和全局样式 */

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

html,
body {
    font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    line-height: 1.6;
    color: var(--ink-dark);
    background: var(--bg-light);
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    display: block;
}


/* 布局容器 */

.container {
    max-width: 1160px;
    margin: 0 auto;
    padding: 0 16px;
}

.container-narrow {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 16px;
}


/* 文本样式 */

.muted {
    color: var(--muted);
}

.muted-light {
    color: var(--muted-light);
}

.lead {
    color: var(--muted);
    font-size: 18px;
    line-height: 1.6;
    max-width: 600px;
}


/* 按钮样式 */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--pri);
    color: var(--ink-light);
    padding: 0.6rem 0.9rem;
    border-radius: 0.6rem;
    border: none;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

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

.btn-outline:hover {
    background: var(--pri);
    color: var(--ink-light);
}


/* 卡片组件 */

.card {
    background: var(--bg-card);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 16px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.card:hover {
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}


/* 网格布局 */

.grid {
    display: grid;
    gap: 20px;
}

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

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}


/* 弹性布局工具类 */

.flex {
    display: flex;
    align-items: center;
}

.flex-between {
    justify-content: space-between;
}

.flex-center {
    justify-content: center;
}

.gap-sm {
    gap: 8px;
}

.gap-md {
    gap: 16px;
}

.gap-lg {
    gap: 24px;
}


/* 间距工具类 */

.section {
    padding: 64px 0;
}

.section-sm {
    padding: 36px 0;
}

.hero {
    padding: 56px 0;
    border-bottom: 1px solid var(--line);
}


/* 导航栏样式 */

header {
    border-bottom: 1px solid var(--line);
    background: var(--bg-light);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav {
    display: flex;
    gap: 14px;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}


/* 响应式设计 */

@media (max-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 12px;
    }
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    .section {
        padding: 48px 0;
    }
    .section-sm {
        padding: 24px 0;
    }
    .hero {
        padding: 40px 0;
    }
    .nav {
        flex-direction: column;
        height: auto;
        padding: 12px 0;
        gap: 8px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 8px;
    }
    .section {
        padding: 32px 0;
    }
    .btn {
        padding: 0.5rem 0.8rem;
        font-size: 14px;
    }
}


/* 表单样式 */

input,
textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    font-family: inherit;
    font-size: 14px;
}

textarea {
    min-height: 120px;
    resize: vertical;
}

label {
    font-size: 14px;
    color: var(--muted);
    margin-bottom: 4px;
    display: block;
}

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

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}


/* 工具类 */

.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.hidden {
    display: none;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}