/* =========================================
   全局样式与变量定义
   ========================================= */
:root {
    --primary-color: #2ea44f;
    --primary-hover: #2c974b;
    --danger-color: #d73a49;
    --link-color: #0366d6;
    --bg-color: #f6f8fa;
    --text-color: #24292e;
    --border-color: #e1e4e8;
    --card-bg: #ffffff;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
    background-color: var(--bg-color);
    color: var(--text-color);
}

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

/* =========================================
   优雅的自定义滚动条
   ========================================= */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}

/* =========================================
   头部与登录区块
   ========================================= */
header {
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
    margin-bottom: 30px;
}

header h1 { margin: 0; color: var(--text-color); }
header p { margin: 5px 0 0; color: #586069; }
header a { color: var(--link-color); text-decoration: none; font-weight: 500; }
header a:hover { text-decoration: underline; }

#auth-container {
    max-width: 400px;
    margin: 10vh auto;
    text-align: center;
    padding: 40px 20px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.05);
}

#login-btn {
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    padding: 12px 24px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: background-color 0.2s, transform 0.1s;
    margin-top: 20px;
}
#login-btn:hover { background-color: var(--primary-hover); }
#login-btn:active { transform: scale(0.98); }

/* =========================================
   搜索与上传区块
   ========================================= */
.search-section {
    margin-bottom: 25px;
    text-align: center;
}

#search-input {
    width: 100%;
    max-width: 600px;
    padding: 12px 20px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 16px;
    transition: box-shadow 0.3s, border-color 0.3s;
    outline: none;
    box-shadow: 0 2px 5px rgba(0,0,0,0.02);
}
#search-input:focus {
    border-color: var(--link-color);
    box-shadow: 0 0 0 3px rgba(3, 102, 214, 0.2);
}

.upload-section {
    padding: 40px 20px;
    border: 2px dashed #c8e1ff;
    background-color: #f1f8ff;
    border-radius: 12px;
    transition: all 0.3s ease;
    text-align: center;
    margin-bottom: 30px;
}
.upload-section.drag-over {
    background-color: #e6ffed;
    border-color: var(--primary-color);
    transform: scale(1.01);
}

.upload-form p { color: #586069; margin: 0 0 15px; font-size: 15px; }
.upload-label {
    background-color: var(--link-color);
    color: white;
    font-weight: 600;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    display: inline-block;
    transition: background-color 0.2s;
}
.upload-label:hover { background-color: #005cc5; }
.hidden-file-input { display: none; }
#upload-status { padding-top: 15px; color: var(--link-color); font-weight: 500; min-height: 24px;}

/* =========================================
   画廊与卡片展示
   ========================================= */
#gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 25px;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}
.card.optimistic-pending {
    opacity: 0.6;
    transform: scale(0.98);
    pointer-events: none;
}

.card img {
    max-width: 100%;
    height: 120px;
    object-fit: contain;
    margin-bottom: 15px;
    /* 增加一个透明方格背景，方便看清白色或透明图标 */
    background-image: linear-gradient(45deg, #eee 25%, transparent 25%, transparent 75%, #eee 75%, #eee), 
                      linear-gradient(45deg, #eee 25%, transparent 25%, transparent 75%, #eee 75%, #eee);
    background-size: 16px 16px;
    background-position: 0 0, 8px 8px;
    border-radius: 4px;
    padding: 5px;
}

.card .filename {
    font-size: 14px;
    word-break: break-all;
    margin-bottom: 15px;
    font-weight: 600;
    color: var(--text-color);
}

.card .actions {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: auto;
}

.card .actions button {
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 12px;
    font-weight: 500;
    transition: all 0.2s;
    background-color: #fafbfc;
    color: var(--text-color);
}
.card .actions button.copy-btn:hover { background-color: var(--link-color); color: white; border-color: var(--link-color); }
.card .actions button.replace-btn:hover { background-color: var(--primary-color); color: white; border-color: var(--primary-color); }
.card .actions button.delete-btn { color: var(--danger-color); }
.card .actions button.delete-btn:hover { background-color: var(--danger-color); color: white; border-color: var(--danger-color); }

/* =========================================
   Toast 提示消息框
   ========================================= */
#toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.toast {
    background-color: rgba(36, 41, 46, 0.95);
    backdrop-filter: blur(4px);
    color: #fff;
    padding: 14px 24px;
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
    opacity: 0;
    transform: translateX(120%);
    transition: opacity 0.3s, transform 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    font-size: 14px;
    font-weight: 500;
}
.toast.show { opacity: 1; transform: translateX(0); }
.toast.error { border-left: 4px solid var(--danger-color); }
.toast.info { border-left: 4px solid var(--link-color); }
.toast.success { border-left: 4px solid var(--primary-color); }

/* 简单的加载动画 */
#loading {
    text-align: center;
    padding: 40px;
    color: var(--link-color);
    font-weight: 600;
    font-size: 18px;
}