/* ================= 公共基础样式 - PC-TOOL ================= */

/* ---------- 全局重置 ---------- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* ---------- 页面背景 ---------- */
body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-color: #09090b;
    color: #f4f4f5;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    background-image: linear-gradient(to bottom left, #242323, #131314, #000000);
    background-attachment: fixed;
    position: relative;
    padding: 20px;
}

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

/* ---------- 背景粒子画布 ---------- */
.bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    pointer-events: none;
    filter: blur(2px);
}

/* ---------- 动画 ---------- */
@keyframes fadeUp {
    from { transform: translateY(10px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* ---------- 返回链接 ---------- */
.back-link {
    position: fixed;
    top: 20px;
    left: 20px;
    color: #a1a1aa;
    font-size: 15px;
    transition: color 0.3s;
    z-index: 10;
    background: rgba(24, 24, 27, 0.5);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 8px 16px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.back-link:hover {
    color: #e4e4e7;
}

/* ---------- 主卡片容器 ---------- */
.container {
    max-width: 600px;
    width: 100%;
    background: rgba(24, 24, 27, 0.3);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 40px;
    border-radius: 16px;
    animation: fadeUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.container h1 {
    color: #e4e4e7;
    margin-bottom: 25px;
    font-size: 28px;
    font-weight: 700;
}

.container > p {
    color: #a1a1aa;
    font-size: 16px;
    line-height: 1.6;
}

/* ---------- 上传区域 ---------- */
.upload-area {
    border: 2px dashed rgba(255, 255, 255, 0.1);
    padding: 40px;
    border-radius: 10px;
    margin: 20px 0;
    cursor: pointer;
    transition: 0.3s;
    background: rgba(255, 255, 255, 0.02);
    text-align: center;
    color: #a1a1aa;
}

.upload-area input[type="file"] { display: none; }

.upload-area:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.2);
}

/* ---------- 格式选择下拉 ---------- */
.format-select {
    padding: 10px 15px;
    font-size: 16px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    margin: 10px;
    background: rgba(255, 255, 255, 0.05);
    color: #e4e4e7;
    cursor: pointer;
    appearance: none;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="%23a1a1aa" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="6 9 12 15 18 9"/></svg>');
    background-repeat: no-repeat;
    background-position: right 0.7rem center;
    background-size: 1.2rem;
    padding-right: 2.2rem;
}

.format-select:focus {
    outline: none;
    border-color: rgba(129, 140, 248, 0.5);
}

/* ---------- 通用按钮 ---------- */
.btn, .convert-btn, .compress-btn, .extract-btn {
    padding: 12px 25px;
    background: rgba(24, 24, 27, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: white;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    margin: 10px;
    transition: all 0.3s;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.btn:hover, .convert-btn:hover, .compress-btn:hover, .extract-btn:hover {
    background: rgba(39, 39, 42, 0.6);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.btn:active, .convert-btn:active, .compress-btn:active, .extract-btn:active {
    transform: translateY(0) scale(0.98);
}

/* ---------- 下载按钮 ---------- */
.download-btn {
    padding: 12px 25px;
    background: rgba(39, 174, 96, 0.3);
    border: 1px solid rgba(39, 174, 96, 0.3);
    color: white;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    margin: 10px;
    transition: all 0.3s;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: none;
}

.download-btn:hover {
    background: rgba(39, 174, 96, 0.5);
    border-color: rgba(39, 174, 96, 0.5);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.download-btn:active {
    transform: translateY(0) scale(0.98);
}

/* ---------- 结果展示 ---------- */
.result-box {
    margin-top: 30px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    display: none;
    text-align: center;
}

.result-box h3 {
    color: #e4e4e7;
}

/* ---------- 联系提示 ---------- */
.contact-tip {
    margin-top: 40px;
    text-align: center;
    font-size: 15px;
    color: #71717a;
    line-height: 1.6;
}

.contact-tip strong {
    color: #818cf8;
}

/* ---------- 禁用按钮 ---------- */
button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
}

/* ---------- 滚动条美化 ---------- */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.02);
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.18);
}

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
    .container {
        padding: 20px;
    }
    .back-link {
        top: 10px;
        left: 10px;
        font-size: 13px;
        padding: 6px 12px;
    }
}