/* --- Variables and Global Styles --- */
:root {
    --primary-color: #A7F3D0; /* 浅亮绿色 */
    --primary-color-dark: #6EE7B7;
    --dark-text: #1f2937;
    --light-text: #f9fafb;
    --body-bg: #f3f4f6; /* 使用了稍深的背景色，让白色卡片突出 */
    --container-bg: #ffffff;
    --border-color: #e5e7eb;
    --hover-bg: #f9fafb;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--body-bg);
    color: var(--dark-text);
    line-height: 1.6;
}

a {
    color: var(--primary-color-dark);
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}

.head-container {
    max-width: 1200px; /* 稍微加宽以适应现代屏幕 */
    margin: 0 auto;
    padding: 0 20px;
}

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

/* --- Header & Navigation --- */
.header {
    background-color: var(--container-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    margin-bottom: 2rem;
}
.header .head-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--dark-text);
    text-decoration: none;
}
.nav a {
    color: var(--dark-text);
    text-decoration: none;
    margin-left: 1.5rem;
    transition: color 0.3s ease;
}
.nav a:hover {
    color: var(--primary-color-dark);
}

/* --- Browser Header and Breadcrumbs --- */
.browser-header {
    margin-bottom: 1.5rem;
}
.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    padding: 0;
    margin-bottom: 0.5rem;
    list-style: none;
}
.breadcrumb-item {
    display: flex;
    align-items: center;
    font-size: 0.9rem;
}
.breadcrumb-item a {
    color: #6b7280;
}
.breadcrumb-item + .breadcrumb-item::before {
    display: inline-block;
    padding: 0 .5rem;
    color: #6c757d;
    content: "/";
}

/* --- Main Content & Footer --- */
.footer {
    text-align: center;
    padding: 1.5rem 0;
    margin-top: 2rem;
    color: #6b7280;
    border-top: 1px solid var(--border-color);
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--dark-text);
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s ease;
}
.btn:hover {
    background-color: var(--primary-color-dark);
    text-decoration: none;
}
.btn-small {
    padding: 5px 10px;
    font-size: 0.8rem;
}

/* --- Collapse Box Styles --- */
.collapse-box {
    background-color: var(--container-bg);
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    border: 1px solid var(--border-color);
    overflow: hidden;
    margin-bottom: 1rem;
}
.collapse-header {
    background-color: #f9fafb;
    padding: 1rem 1.5rem;
    cursor: pointer;
    user-select: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.3s ease;
}
.collapse-header:hover {
    background-color: #f3f4f6;
}
.collapse-header h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark-text);
    display: flex;
    align-items: center;
    gap: 10px;
}
.collapse-icon {
    font-size: 1rem;
    color: #6b7280;
    transition: transform 0.3s ease;
    display: inline-block;
}
.collapse-icon.open {
    transform: rotate(180deg);
}
.collapse-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

/* --- Upload Forms --- */
.upload-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding: 1.5rem;
    margin-bottom: 0.5rem;
}
.upload-section {
    background: var(--container-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
}
.upload-section h3 {
    margin-top: 0;
    margin-bottom: 1rem;
    font-size: 1.2rem;
    color: var(--dark-text);
    font-weight: 600;
}
.form-container {
    padding: 0;
    box-shadow: none;
    max-width: none;
    margin: 0;
}
.form-group {
    margin-bottom: 1rem;
}
.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--dark-text);
}
.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    font-family: var(--font-family);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    background-color: var(--container-bg);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color-dark);
    box-shadow: 0 0 0 3px rgba(167, 243, 208, 0.2);
}
.form-group textarea {
    resize: vertical;
    min-height: 60px;
}
.form-group select {
    cursor: pointer;
}

/* 文件输入美化 */
.form-group input[type="file"]::file-selector-button {
    background-color: var(--primary-color);
    color: var(--dark-text);
    padding: 6px 12px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    margin-right: 10px;
    transition: background-color 0.3s ease;
    font-weight: 500;
}
.form-group input[type="file"]::file-selector-button:hover {
    background-color: var(--primary-color-dark);
}

/* --- File List/Table Styles --- */
.file-list-section {
    background-color: var(--container-bg);
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    border: 1px solid var(--border-color);
    overflow: hidden;
}
.file-table {
    width: 100%;
    border-collapse: collapse;
}
.file-table th {
    background-color: #f9fafb;
    padding: 10px 15px;
    text-align: left;
    font-size: 0.8rem;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--border-color);
}
.file-table td {
    padding: 10px 15px;
    border-bottom: 1px solid var(--border-color);
}
/* 移除最后一行多余的边框 */
.file-table tr:last-child td {
    border-bottom: none;
}
/* Hover effect for table rows */
.file-table tbody tr:hover {
    background-color: var(--hover-bg);
}

.item-link {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--dark-text);
    font-weight: 500;
    text-decoration: none;
}
.item-link:hover {
    text-decoration: underline;
}
.item-link .icon {
    font-size: 1.2rem;
    line-height: 1;
}

/* --- Badge --- */
.badge {
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: capitalize;
    display: inline-block;
}
.badge.public {
    background-color: #d1fae5;
    color: #065f46;
}
.badge.private {
    background-color: #fee2e2;
    color: #991b1b;
}

/* --- Misc --- */
.empty-folder {
    text-align: center;
    padding: 2rem;
    color: #6b7280;
}