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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #0a0e27 0%, #1a1f4e 50%, #0d1136 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    position: relative;
    overflow-x: hidden;
}

/* 背景动态光晕效果 */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 20% 80%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(118, 75, 162, 0.12) 0%, transparent 50%),
                radial-gradient(circle at 50% 50%, rgba(0, 255, 255, 0.08) 0%, transparent 40%);
    animation: bgGlow 15s ease-in-out infinite;
    z-index: -1;
}

@keyframes bgGlow {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(-2%, -2%) scale(1.05); }
}

.container {
    width: 100%;
    max-width: 1200px;
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4),
                inset 0 1px 0 rgba(255, 255, 255, 0.1);
    overflow: hidden;
}

.hero-section {
    position: relative;
    background: linear-gradient(135deg, #0a0e27 0%, #1a1f4e 100%);
    color: white;
    padding: 0;
    text-align: center;
    overflow: hidden;
    height: 320px;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('hero-bg.jpg');
    background-size: cover;
    background-position: center 30%;
    opacity: 0.6;
    z-index: 1;
}

.hero-section::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, rgba(10, 14, 39, 0.7) 0%, rgba(26, 31, 78, 0.5) 100%);
    z-index: 2;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 100%, rgba(102, 126, 234, 0.15) 0%, transparent 70%);
    z-index: 3;
}

.hero-content {
    position: relative;
    z-index: 4;
    padding: 50px 20px;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.hero-content .theme-text {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 12px;
    color: rgba(255, 255, 255, 0.7);
    letter-spacing: 3px;
    text-transform: uppercase;
}

.hero-content h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 12px;
    background: linear-gradient(135deg, #ffffff 0%, #e0e7ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 4px 20px rgba(102, 126, 234, 0.3);
    letter-spacing: 2px;
}

.hero-content .subtitle {
    font-size: 28px;
    color: rgba(255, 255, 255, 0.7);
    font-weight: 400;
    letter-spacing: 1px;
}

.main-content {
    padding: 50px 40px 60px;
}

.card-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.card {
    background: rgba(255, 255, 255, 0.02);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 45px 35px;
    text-align: center;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(255, 255, 255, 0.06);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2),
                inset 0 1px 0 rgba(255, 255, 255, 0.05);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent 0%, rgba(102, 126, 234, 0.5) 50%, transparent 100%);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 60px rgba(102, 126, 234, 0.15),
                0 0 40px rgba(102, 126, 234, 0.1),
                inset 0 1px 0 rgba(255, 255, 255, 0.1);
    border-color: rgba(102, 126, 234, 0.3);
}

.card:hover::before {
    opacity: 1;
}

.card-icon {
    width: 96px;
    height: 96px;
    margin: 0 auto 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border-radius: 20px;
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.card-icon svg {
    width: 56px;
    height: 56px;
    filter: drop-shadow(0 4px 16px rgba(102, 126, 234, 0.4));
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.card:hover .card-icon {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.2) 0%, rgba(118, 75, 162, 0.2) 100%);
    border-color: rgba(102, 126, 234, 0.4);
    transform: scale(1.05);
}

.card:hover .card-icon svg {
    transform: scale(1.1);
    filter: drop-shadow(0 8px 24px rgba(102, 126, 234, 0.6));
}

.card h2,
.form-container h1,
.form-container h2,
.form-container h3,
.form-container h4 {
    color: #ffffff;
    margin-bottom: 12px;
    font-weight: 600;
}

.card p,
.form-container p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 20px;
    line-height: 1.7;
    font-size: 0.95rem;
}

.card-note {
    background: rgba(102, 126, 234, 0.05);
    border-left: 3px solid rgba(102, 126, 234, 0.6);
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.7);
    margin: 16px auto 0;
    line-height: 1.5;
    text-align: center;
    white-space: nowrap;
}

.btn {
    padding: 14px 36px;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 600;
    letter-spacing: 0.5px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.5);
    background: linear-gradient(135deg, #7c8eee 0%, #8a5bb5 100%);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
}

.form-container {
    max-width: 800px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #ffffff;
    font-weight: 600;
}

.form-group label .required {
    color: #ff6b6b;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid rgba(255, 255, 255, 0.15);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    background-color: rgba(255, 255, 255, 0.05);
    color: #ffffff;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(255, 255, 255, 0.4);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
    background-color: rgba(255, 255, 255, 0.08);
}

.form-group select {
    cursor: pointer;
    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 fill='rgba(255,255,255,0.6)' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 15px center;
    padding-right: 40px;
}

.form-group select:disabled {
    background-color: rgba(255, 255, 255, 0.03);
    cursor: not-allowed;
    color: rgba(255, 255, 255, 0.3);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.team-members {
    border: 2px dashed rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.02);
}

.member-item {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 15px;
    position: relative;
}

.member-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.member-header h4 {
    color: #ffffff;
}

.btn-remove {
    background: #e74c3c;
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
}

.btn-remove:hover {
    background: #c0392b;
}

.btn-add {
    background: linear-gradient(135deg, #27ae60 0%, #2ecc71 100%);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(39, 174, 96, 0.3);
}

.btn-add:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(39, 174, 96, 0.4);
}

.btn-add:disabled {
    background: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.3);
    cursor: not-allowed;
    box-shadow: none;
}

.file-upload-area {
    border: 2px dashed rgba(102, 126, 234, 0.4);
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    background: rgba(102, 126, 234, 0.05);
    cursor: pointer;
    transition: all 0.3s ease;
}

.file-upload-area:hover {
    background: rgba(102, 126, 234, 0.08);
    border-color: rgba(102, 126, 234, 0.6);
}

.file-upload-area.dragover {
    background: rgba(102, 126, 234, 0.1);
    border-style: solid;
    border-color: rgba(102, 126, 234, 0.8);
}

.file-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.file-upload-area p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 10px;
}

.file-hint {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.5);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: #e9ecef;
    border-radius: 4px;
    margin-top: 15px;
    overflow: hidden;
    display: none;
}

.progress-bar.active {
    display: block;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    width: 0%;
    transition: width 0.3s ease;
}

.file-list {
    margin-top: 15px;
}

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(255, 255, 255, 0.05);
    padding: 12px 15px;
    border-radius: 8px;
    margin-bottom: 10px;
}

.file-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.file-name {
    font-weight: 500;
    color: #ffffff;
}

.file-size {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
}

.btn-delete-file {
    background: none;
    border: none;
    color: #e74c3c;
    cursor: pointer;
    font-size: 1.2rem;
}

.form-buttons {
    display: flex;
    gap: 15px;
    justify-content: flex-end;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #e9ecef;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-weight: 600;
    margin-bottom: 30px;
    transition: color 0.3s ease;
}

.back-btn:hover {
    color: #ffffff;
}

.error-message {
    background: rgba(255, 107, 107, 0.15);
    border: 1px solid rgba(255, 107, 107, 0.4);
    color: #ff8a8a;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: none;
}

.error-message.active {
    display: block;
}

.success-message {
    background: rgba(46, 204, 113, 0.15);
    border: 1px solid rgba(46, 204, 113, 0.4);
    color: #8affbf;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: none;
}

.success-message.active {
    display: block;
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: linear-gradient(135deg, #1a1f4e 0%, #0d1136 100%);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 40px;
    text-align: center;
    max-width: 400px;
    animation: modalIn 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

@keyframes modalIn {
    from {
        transform: scale(0.8);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.modal-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.modal-content h2 {
    color: #ffffff;
    margin-bottom: 15px;
    font-size: 1.8rem;
}

.modal-content p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 30px;
    font-size: 1rem;
}

.footer {
    text-align: center;
    padding: 24px;
    color: rgba(255, 255, 255, 0.3);
    background: transparent;
    border-top: 1px solid rgba(255, 255, 255, 0.04);
}

.footer p {
    font-size: 0.85rem;
}

.footer .ai-notice {
    font-size: 11px;
    color: rgba(255, 255, 255, 0.2);
    margin-top: 6px;
    font-style: italic;
}

/* 字数统计样式 */
.char-count {
    text-align: right;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.4);
    margin-top: 4px;
}

.char-count.warning {
    color: #ffd93d;
}

.char-count.danger {
    color: #ff6b6b;
}

@media (max-width: 768px) {
    .hero-content .theme-text {
        font-size: 20px;
        letter-spacing: 2px;
    }
    
    .hero-content h1 {
        font-size: 32px;
    }
    
    .hero-content .subtitle {
        font-size: 20px;
    }
    
    .hero-section {
        height: 260px;
    }
    
    .main-content {
        padding: 40px 20px;
    }
    
    .card-container {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .card {
        padding: 35px 25px;
    }
    
    .card-icon {
        width: 80px;
        height: 80px;
    }
    
    .card-icon svg {
        width: 44px;
        height: 44px;
    }
    
    .card-note {
        font-size: 0.78rem;
        padding: 8px 12px;
        max-width: 100%;
        white-space: normal;
    }
    
    .btn {
        padding: 12px 28px;
        width: 100%;
        justify-content: center;
    }
    
    .form-buttons {
        flex-direction: column;
    }
    
    .form-buttons .btn {
        width: 100%;
    }
}