/* ============================================================
   main.css - 公共样式（整站通用）
   ============================================================ */

/* ============================================================
   Part 1: CSS Variables
   ============================================================ */
:root {
    --color-primary: #FF6600;
    --color-primary-dark: #CD5403;
    --color-primary-light: #FFF0E6;
    --color-primary-hover: #E85A00;
    --color-text: #1A1A1A;
    --color-text-secondary: #666666;
    --color-text-muted: #999999;
    --color-text-white: #FFFFFF;
    --color-bg: #F8F6F3;
    --color-bg-white: #FFFFFF;
    --color-bg-light: #FAFAFA;
    --color-bg-card: #FFFFFF;
    --color-border: #E8E5E0;
    --color-border-light: #F0EDE8;
    --color-success: #4CAF50;
    --color-warning: #FFC107;
    --color-danger: #E53935;
    --color-info: #42A5F5;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 2px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 6px 24px rgba(0,0,0,0.10);
    --shadow-xl: 0 12px 48px rgba(0,0,0,0.14);
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    --font-family: "Microsoft YaHei", "PingFang SC", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-md: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 22px;
    --font-size-2xl: 28px;
    --font-size-3xl: 36px;
    --container-max: 1200px;
    --container-padding: 20px;
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
    --transition-slow: 0.4s ease;
}

/* ============================================================
   Part 2: Reset
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { font-family: var(--font-family); font-size: var(--font-size-sm); line-height: 1.6; color: var(--color-text); background: var(--color-bg); -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-text); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-primary); text-decoration: none; }
ul, ol { list-style: none; }
input, button, select, textarea { font-family: inherit; font-size: inherit; line-height: inherit; border: none; outline: none; background: none; }
button { cursor: pointer; }
h1, h2, h3, h4, h5, h6 { font-weight: 600; line-height: 1.3; }
table { border-collapse: collapse; width: 100%; }
.sr-only { position: absolute !important; width: 1px !important; height: 1px !important; padding: 0 !important; margin: -1px !important; overflow: hidden !important; clip: rect(0,0,0,0) !important; border: 0 !important; }

/* ============================================================
   Part 3: Common Components
   ============================================================ */
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--container-padding); }
.card { background: var(--color-bg-card); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); padding: var(--spacing-lg); transition: box-shadow var(--transition-base), transform var(--transition-base); }
.card:hover { box-shadow: var(--shadow-md); }
.card-header { display: flex; align-items: center; justify-content: space-between; padding-bottom: var(--spacing-md); border-bottom: 1px solid var(--color-border-light); margin-bottom: var(--spacing-md); }
.card-header .title { font-size: var(--font-size-md); font-weight: 600; color: var(--color-text); }
.card-header .more { font-size: var(--font-size-xs); color: var(--color-text-muted); }
.card-header .more:hover { color: var(--color-primary); }
.section-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--spacing-lg); }
.section-header h2 { font-size: var(--font-size-xl); font-weight: 700; color: var(--color-text); }
.section-header h2::before { content: ''; display: inline-block; width: 4px; height: 24px; background: var(--color-primary); border-radius: var(--radius-full); margin-right: var(--spacing-sm); vertical-align: middle; }
.btn-primary { display: inline-block; padding: 10px 24px; background: var(--color-primary); color: var(--color-text-white); border-radius: var(--radius-full); font-weight: 600; font-size: var(--font-size-sm); transition: background var(--transition-fast), transform var(--transition-fast); }
.btn-primary:hover { background: var(--color-primary-dark); color: var(--color-text-white); transform: translateY(-1px); }
.highlight { color: var(--color-primary); }
.date { color: var(--color-text-muted); font-size: var(--font-size-xs); }
.divider { color: var(--color-border); margin: 0 var(--spacing-sm); }
.hide-mobile { display: inline; }
.show-mobile { display: none; }
@media (max-width: 768px) { .hide-mobile { display: none !important; } .show-mobile { display: inline !important; } .container { padding: 0 var(--spacing-md); } .card { padding: var(--spacing-md); } }

/* ============================================================
   Part 4: Header
   ============================================================ */
.site-header { background: var(--color-bg-white); border-bottom: 1px solid var(--color-border-light); font-size: var(--font-size-xs); }
.header-top { display: flex; align-items: center; justify-content: space-between; height: 36px; flex-wrap: wrap; }
.header-user { display: flex; align-items: center; gap: var(--spacing-sm); flex-wrap: wrap; }
.header-user .greeting { color: var(--color-text-secondary); }
.header-user .username { color: var(--color-primary); font-weight: 600; }
.header-user .link { color: var(--color-text-secondary); }
.header-user .link:hover { color: var(--color-primary); }
.header-user .badge { padding: 1px 10px; border-radius: var(--radius-full); background: var(--color-primary-light); color: var(--color-primary); font-size: var(--font-size-xs); }
.header-user .badge.done { background: #E8F5E9; color: var(--color-success); }
.header-nav { display: flex; align-items: center; gap: var(--spacing-md); }
.header-nav a { color: var(--color-text-secondary); font-size: var(--font-size-xs); white-space: nowrap; }
.header-nav a:hover { color: var(--color-primary); }
.header-nav a.highlight { color: var(--color-primary); font-weight: 600; }

/* ---- 搜索区域 ---- */
.site-search { background: var(--color-bg-white); padding: var(--spacing-md) 0; border-bottom: 1px solid var(--color-border-light); }

/* 搜索包装器 - 使用 flex 布局 */
.search-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

/* Logo 区域 - 固定宽度不伸缩 */
.logo {
    flex-shrink: 0;
}
.logo a { display: flex; align-items: center; gap: var(--spacing-sm); }
.logo img { height: 48px; width: auto; }
.logo .site-name { font-size: var(--font-size-xl); font-weight: 700; color: var(--color-primary); }

/* 搜索表单 - 占据剩余空间，但不超过 480px */
.search-form {
    display: flex;
    align-items: stretch;
    flex: 1 1 auto;
    max-width: 480px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: border-color var(--transition-fast);
    background: var(--color-bg-white);
}
.search-form:focus-within { border-color: var(--color-primary); }

/* ★ 原生 select 下拉 - 替代原来的自定义下拉 ★ */
.search-select-native {
    flex-shrink: 0;
    padding: 0 28px 0 var(--spacing-md);
    border: none;
    border-right: 1px solid var(--color-border);
    background: var(--color-bg-light);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    min-height: 44px;
    outline: none;
    -webkit-appearance: none;
    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 d='M6 8L1 3h10z' fill='%23999'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
}
.search-select-native:focus {
    border-color: var(--color-primary);
}
.search-select-native option {
    background: #fff;
    color: var(--color-text);
}

.search-input {
    flex: 1;
    padding: 10px var(--spacing-md);
    font-size: var(--font-size-sm);
    min-width: 80px;
    border: none;
    outline: none;
    background: transparent;
}
.search-input::placeholder { color: var(--color-text-muted); }

.search-btn {
    flex-shrink: 0;
    padding: 0 var(--spacing-lg);
    background: var(--color-primary);
    color: var(--color-text-white);
    font-size: var(--font-size-lg);
    transition: background var(--transition-fast);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
}
.search-btn:hover { background: var(--color-primary-dark); }
.search-btn svg { width: 20px; height: 20px; fill: currentColor; }

/* 创建按钮 - 桌面端靠右 */
.create-btn {
    flex-shrink: 0;
    margin-left: auto;
}
.create-btn .btn-primary {
    padding: 10px 28px;
    white-space: nowrap;
}

/* 汉堡菜单 - 桌面端隐藏 */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
    flex-shrink: 0;
}
.hamburger span {
    display: block;
    width: 26px;
    height: 3px;
    background: var(--color-text);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* 主导航 */
.main-nav { background: var(--color-primary); position: sticky; top: 0; z-index: 50; box-shadow: var(--shadow-sm); }
.nav-list { display: flex; align-items: center; gap: 0; margin: 0; padding: 0; list-style: none; overflow-x: visible; overflow-y: visible; }
.nav-list li { flex-shrink: 0; }
.nav-list a { display: block; padding: 12px 24px; color: rgba(255,255,255,0.85); font-weight: 600; font-size: var(--font-size-md); transition: all var(--transition-fast); position: relative; white-space: nowrap; }
.nav-list a:hover { color: var(--color-text-white); background: rgba(255,255,255,0.12); }
.nav-list a.active { color: var(--color-text-white); background: rgba(255,255,255,0.15); }
.nav-list a.active::after { content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); width: 24px; height: 3px; background: var(--color-text-white); border-radius: var(--radius-full) var(--radius-full) 0 0; }

/* ============================================================
   Part 5: Footer
   ============================================================ */
.site-footer { background: #2C2C2C; color: #CCCCCC; padding: 20px 0; margin-top: 10px; }
.footer-help { text-align: center; padding-bottom: 12px; border-bottom: 1px solid rgba(255,255,255,0.08); margin-bottom: 12px; }
.footer-help a { color: #999; font-size: 13px; margin: 0 4px; }
.footer-help a:hover { color: #FF6600; }
.footer-help .sep { color: #555; font-size: 13px; }
.footer-bottom { text-align: center; }
.footer-bottom p { font-size: 12px; color: #666; line-height: 1.8; margin: 0; }
.footer-bottom .footer-stat { color: #555; }

/* ============================================================
   Part 6: Header 响应式
   ============================================================ */

/* 平板设备 (768px - 992px) */
@media (max-width: 992px) {
    .search-wrapper {
        gap: var(--spacing-md);
        flex-wrap: wrap;
    }
    .search-form {
        flex: 1 1 100%;
        max-width: 100%;
        order: 3;
    }
    .create-btn {
        margin-left: auto;
        order: 2;
    }
    .hamburger {
        order: 1;
    }
    .create-btn .btn-primary {
        padding: 8px 20px;
        font-size: var(--font-size-xs);
    }
}

/* 手机设备 (< 768px) */
@media (max-width: 768px) {
    .site-header .header-top {
        height: auto;
        padding: var(--spacing-xs) 0;
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
    .header-user .greeting { font-size: var(--font-size-xs); }
    .header-nav {
        display: none !important;
    }

    .logo .site-name { font-size: var(--font-size-lg); }
    .logo img { height: 36px; }

    .search-wrapper {
        display: flex;
        align-items: center;
        flex-wrap: wrap;
        gap: 10px;
    }
    .search-wrapper .logo {
        flex-shrink: 0;
		margin-right: auto;    /* ★ 关键：让按钮居中，撑开左右空间 ★ */
        order: 0;
    }
    .create-btn {
        flex-shrink: 0;
        margin-left: 0;
        order: 1;
    }
    .create-btn .btn-primary {
        padding: 6px 14px;
        font-size: var(--font-size-xs);
        border-radius: var(--radius-sm);
    }
    .hamburger {
        display: flex;
        order: 2;
        margin-left: auto;
        padding: 8px 6px;
    }
    .search-wrapper .search-form {
        flex: 1 1 100%;
        max-width: 100%;
        order: 3;
    }
    .search-form {
        border-radius: var(--radius-sm);
    }
    .search-input {
        padding: 8px var(--spacing-sm);
        font-size: var(--font-size-xs);
    }
    .search-btn {
        padding: 0 14px;
        min-height: 38px;
    }
    .search-btn svg {
        width: 16px;
        height: 16px;
    }
    .search-select-native {
        padding: 0 24px 0 var(--spacing-sm);
        font-size: var(--font-size-xs);
        min-height: 38px;
        background-position: right 6px center;
    }

    /* 主导航 - 移动端折叠菜单 */
    .main-nav .nav-list {
        display: grid !important;
        grid-template-columns: repeat(3, 1fr);
        gap: 2px;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s ease, padding 0.3s ease;
        background: var(--color-primary);
        border-radius: 0 0 var(--radius-md) var(--radius-md);
        box-shadow: var(--shadow-md);
        padding: 0 4px;
    }
    .main-nav .nav-list.open {
        max-height: 500px;
        padding: 8px 4px;
        overflow-y: auto;
    }
    .main-nav .nav-list li {
        width: 100%;
        border-bottom: none;
        border-radius: var(--radius-sm);
        overflow: hidden;
    }
    .main-nav .nav-list a {
        display: block;
        padding: 10px 8px;
        color: rgba(255,255,255,0.85);
        font-size: 13px;
        font-weight: 500;
        text-align: center;
        transition: background 0.25s;
        border-radius: var(--radius-sm);
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    .main-nav .nav-list a:hover { background: rgba(255,255,255,0.15); color: #fff; }
    .main-nav .nav-list a.active { background: rgba(255,255,255,0.2); color: #fff; }
    .main-nav .nav-list a.active::after { display: none; }

    .hamburger {
        display: flex;
        flex-direction: column;
        gap: 5px;
        padding: 10px 6px;
        background: none;
        border: none;
        cursor: pointer;
        border-radius: var(--radius-sm);
        transition: background 0.25s;
    }
    .hamburger:hover { background: var(--color-bg-light); }
    .hamburger span {
        display: block;
        width: 26px;
        height: 3px;
        background: var(--color-text);
        border-radius: 3px;
        transition: all 0.3s ease;
        transform-origin: center;
    }
    .hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 6px); }
    .hamburger.active span:nth-child(2) { opacity: 0; transform: scaleX(0); }
    .hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -6px); }
}

/* 小手机 (< 480px) */
@media (max-width: 480px) {
    .search-wrapper {
        gap: 6px;
    }
    .create-btn .btn-primary {
        padding: 5px 10px;
        font-size: 11px;
    }
    .logo .site-name {
        font-size: var(--font-size-md);
    }
    .logo img {
        height: 30px;
    }
    .search-select-native {
        font-size: 10px;
        padding: 0 20px 0 6px;
        min-height: 34px;
        background-position: right 4px center;
        background-size: 10px 10px;
    }
    .main-nav .nav-list {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-help a {
        font-size: 12px;
        margin: 0 2px;
    }
    .footer-help .sep {
        margin: 0 2px;
    }
}