:root {
    --primary: #4a9eff;
    --primary-dark: #3a7ecc;
    --secondary: #ff5e62;
    --success: #2ecc71;
    --warning: #ff9966;
    --dark: #0c1b33;
    --darker: #081020;
    --light: #e0e0ff;
    --card-bg: rgba(20, 30, 60, 0.7);
    --card-border: rgba(74, 158, 255, 0.3);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Poppins', 'Microsoft YaHei', sans-serif;
}

body {
    background: linear-gradient(135deg, var(--darker), var(--dark));
    color: var(--light);
    min-height: 100vh;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(25, 113, 194, 0.15) 0%, transparent 70%),
        radial-gradient(circle at 80% 70%, rgba(106, 27, 154, 0.15) 0%, transparent 70%);
    z-index: -1;
}

.container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
}

header {
    text-align: center;
    padding: 30px 0;
    margin-bottom: 30px;
    position: relative;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 20px;
}

.logo-icon {
    font-size: 2.5rem;
    color: var(--primary);
    animation: pulse 2s infinite;
}

.logo-text {
    font-size: 2.2rem;
    font-weight: 700;
    background: linear-gradient(90deg, var(--primary), #6a5af9);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.tagline {
    font-size: 1.2rem;
    opacity: 0.85;
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.6;
    color: #c2d6ff;
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 30px;
    margin-bottom: 40px;
}

@media (max-width: 900px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border-radius: 20px;
    padding: 35px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
    position: relative;
    overflow: hidden;
    border: 1px solid var(--card-border);
}

.card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, var(--primary), #00f2fe);
}

.card-title {
    font-size: 1.8rem;
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.card-title i {
    color: var(--primary);
    font-size: 1.8rem;
}

.upload-area {
    border: 3px dashed var(--card-border);
    border-radius: 15px;
    padding: 50px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    margin-bottom: 30px;
    background: rgba(15, 25, 50, 0.4);
}

.upload-area:hover, .upload-area.drag-over {
    border-color: var(--primary);
    background: rgba(74, 158, 255, 0.1);
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: 25px;
    color: var(--primary);
    transition: all 0.3s ease;
}

.upload-area:hover .upload-icon {
    transform: translateY(-5px);
}

.upload-area h3 {
    font-size: 1.6rem;
    margin-bottom: 15px;
}

.upload-area p {
    font-size: 1.1rem;
    color: #a0b9e8;
    margin-bottom: 25px;
}

.file-input {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    opacity: 0;
    cursor: pointer;
}

.file-info {
    background: rgba(30, 40, 80, 0.6);
    border-radius: 15px;
    padding: 25px;
    margin: 25px 0;
    display: none;
    border-left: 4px solid var(--primary);
}

.file-info.show {
    display: block;
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.info-row:last-child {
    border-bottom: none;
}

.precheck-result {
    margin-top: 25px;
    padding: 20px;
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* 新增：预检测结果样式 */
.precheck-success {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    background: rgba(46, 204, 113, 0.1);
    border-radius: 10px;
    border-left: 4px solid #2ecc71;
    font-size: 1.1rem;
}

.precheck-success i {
    color: #2ecc71;
    font-size: 1.8rem;
}

.precheck-error {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    background: rgba(255, 94, 98, 0.1);
    border-radius: 10px;
    border-left: 4px solid #ff5e62;
    font-size: 1.1rem;
}

.precheck-error i {
    color: #ff5e62;
    font-size: 1.8rem;
}

.btn {
    background: linear-gradient(to right, var(--primary), #6a5af9);
    color: white;
    border: none;
    padding: 14px 32px;
    font-size: 1.1rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    box-shadow: 0 5px 20px rgba(74, 158, 255, 0.4);
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(74, 158, 255, 0.6);
}

.btn:disabled {
    background: #555;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
    opacity: 0.7;
}

.btn-block {
    display: block;
    width: 100%;
    padding: 16px;
    margin-top: 20px;
}

.btn-secondary {
    background: linear-gradient(to right, var(--warning), var(--secondary));
}

.btn-success {
    background: linear-gradient(to right, var(--success), #27ae60);
}

.btn-light {
    background: rgba(255, 255, 255, 0.15);
}

.action-buttons {
    display: flex;
    gap: 15px;
    margin-top: 30px;
    flex-wrap: wrap;
}

.card-input-group {
    display: flex;
    gap: 15px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.card-input-group input {
    padding: 14px 20px;
    border-radius: 10px;
    border: none;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 1rem;
    flex: 1;
    min-width: 250px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.card-input-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(74, 158, 255, 0.3);
}

.card-input-group input::placeholder {
    color: #a0b9e8;
}

.status-message {
    padding: 15px;
    border-radius: 10px;
    margin: 20px 0;
    text-align: center;
    display: none;
    font-size: 1.05rem;
}

.status-message.success {
    background: rgba(0, 200, 83, 0.2);
    border: 1px solid var(--success);
    display: block;
}

.status-message.error {
    background: rgba(255, 94, 98, 0.2);
    border: 1px solid var(--secondary);
    display: block;
}

.status-message.warning {
    background: rgba(255, 153, 102, 0.2);
    border: 1px solid var(--warning);
    display: block;
}

.progress-container {
    height: 10px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 5px;
    margin: 30px 0;
    overflow: hidden;
    display: none;
}

.progress-container.show {
    display: block;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(to right, #00c6ff, var(--primary));
    border-radius: 5px;
    width: 0%;
    transition: width 0.3s ease;
    box-shadow: 0 0 10px rgba(0, 198, 255, 0.5);
}

.result-container {
    display: none;
    padding: 30px;
    background: rgba(30, 40, 80, 0.6);
    border-radius: 15px;
    border-left: 4px solid var(--success);
    margin-top: 30px;
    text-align: center;
}

.result-container.show {
    display: block;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.result-icon {
    font-size: 4rem;
    color: var(--success);
    margin-bottom: 20px;
    animation: bounce 1s ease;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {transform: translateY(0);}
    40% {transform: translateY(-20px);}
    60% {transform: translateY(-10px);}
}

.result-title {
    font-size: 2rem;
    margin-bottom: 15px;
}

.result-file {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.1);
    padding: 12px 25px;
    border-radius: 50px;
    margin: 25px 0;
    font-size: 1.1rem;
}

.result-file i {
    color: var(--primary);
}

.sidebar-card {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.features {
    margin-top: 25px;
    list-style: none;
}

.features li {
    padding: 15px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    gap: 15px;
}

.features li:last-child {
    border-bottom: none;
}

.features i {
    color: var(--primary);
    font-size: 1.5rem;
    min-width: 30px;
}

.feature-text h3 {
    margin-bottom: 5px;
}

.feature-text p {
    color: #a0b9e8;
    font-size: 0.95rem;
}

.purchase-section {
    margin-top: auto;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.purchase-section h3 {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.purchase-section p {
    color: #a0b9e8;
    margin-bottom: 20px;
}

.security-icons {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin: 20px 0;
    flex-wrap: wrap;
}

.security-icon {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    width: 80px;
}

.security-icon i {
    font-size: 2rem;
    color: var(--primary);
    background: rgba(20, 30, 60, 0.6);
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    box-shadow: 0 0 15px rgba(74, 158, 255, 0.3);
}

.security-icon span {
    font-size: 0.85rem;
    color: #a0b9e8;
}

footer {
    text-align: center;
    padding: 30px 0 20px;
    opacity: 0.7;
    font-size: 0.9rem;
    width: 100%;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: auto;
}

.file-types {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 25px;
    flex-wrap: wrap;
}

.file-type {
    padding: 8px 18px;
    background: rgba(74, 158, 255, 0.2);
    border-radius: 50px;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.section {
    display: none;
}

.section.active {
    display: block;
}

/* 新增：预检测结果样式增强 */
.precheck-result h4 {
    margin-bottom: 10px;
    color: #a0b9e8;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.precheck-result p {
    font-size: 1.1rem;
    line-height: 1.6;
    padding: 15px;
    border-radius: 8px;
    margin-top: 15px;
}

/* 新增：文件类型图标 */
.file-type i {
    font-size: 1.2rem;
}