/* CSS变量定义 - 与主样式保持一致 */
:root {
    /* 主要颜色 - 现代化调色板 */
    --primary-color: #3b82f6;
    --primary-color-dark: #2563eb;
    --primary-color-light: #dbeafe;
    --accent-color: #8b5cf6;
    --accent-color-dark: #7c3aed;
    
    /* 文本颜色 */
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-muted: #9ca3af;
    
    /* 背景颜色 */
    --background-white: #ffffff;
    --background-light: #f9fafb;
    --background-card: #ffffff;
    
    --border-color: #e5e7eb;
    --border-radius: 8px;
    --card-border-radius: 12px;
    --button-border-radius: 8px;
    
    /* 阴影效果 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    
    /* 状态颜色 */
    --error-color: #ef4444;
    --error-color-light: #fee2e2;
    --success-color: #10b981;
    --success-color-light: #d1fae5;
    
    /* 过渡效果 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

.submit-page {
    padding: 20px 0;
    background: var(--background-gradient);
    min-height: 100vh;
}

.submit-form {
    background-color: var(--background-card);
    border-radius: var(--card-border-radius);
    box-shadow: var(--shadow-sm);
    padding: 24px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-input {
    width: 100%;
    padding: 14px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 15px;
    background-color: var(--background-white);
    color: var(--text-primary);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-color-light);
    background-color: var(--background-white);
}

.form-input:invalid {
    border-color: var(--error-color);
}

.form-input:valid {
    border-color: var(--success-color);
}

.form-textarea {
    width: 100%;
    padding: 14px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 15px;
    resize: vertical;
    min-height: 150px;
    background-color: var(--background-white);
    color: var(--text-primary);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-color-light);
    background-color: var(--background-white);
}

.form-select {
    width: 100%;
    padding: 14px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 15px;
    background-color: var(--background-white);
    color: var(--text-primary);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-color-light);
}

.form-file {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 14px;
}

.download-group {
    background-color: var(--background-light);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 16px;
    margin-bottom: 12px;
}

.add-download-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background-color: var(--background-light);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: 20px;
}

.add-download-btn:hover {
    background-color: var(--primary-color-light);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.remove-download-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px;
    background-color: var(--error-color-light);
    border: 1px solid var(--error-color);
    border-radius: var(--border-radius);
    color: var(--error-color);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 12px;
}

.remove-download-btn:hover {
    background-color: var(--error-color);
    color: white;
}

.submit-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 32px;
    background: linear-gradient(135deg, #e67e22, #d35400);
    color: #ffffff;
    border: none;
    border-radius: 50px;
    font-size: 18px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 6px 20px rgba(230, 126, 34, 0.5);
    margin-top: 20px;
    position: relative;
    overflow: hidden;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    letter-spacing: 0.5px;
}

.submit-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s;
}

.submit-btn:hover {
    background: linear-gradient(135deg, #d35400, #e67e22);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(230, 126, 34, 0.6);
    color: #ffffff;
}

.submit-btn:hover::before {
    left: 100%;
}

.submit-btn:active {
    transform: translateY(0);
    box-shadow: 0 4px 15px rgba(230, 126, 34, 0.4);
}

.submit-btn:disabled {
    background: #666666;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.message {
    padding: 12px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    font-weight: 500;
}

.message.success {
    background-color: var(--success-color-light);
    color: var(--success-color);
    border: 1px solid var(--success-color);
}

.message.error {
    background-color: var(--error-color-light);
    color: var(--error-color);
    border: 1px solid var(--error-color);
}

.form-check {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
}

.form-check-input {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.form-check-label {
    font-size: 14px;
    color: var(--text-secondary);
    cursor: pointer;
}

.form-error {
    color: var(--error-color);
    font-size: 12px;
    margin-top: 4px;
    display: block;
}

/* 验证码样式 */
.captcha-container {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.captcha-question {
    padding: 20px;
    background-color: var(--background-light);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 22px;
    font-weight: 700;
    text-align: center;
    position: relative;
    overflow: hidden;
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: captchaColorChange 8s infinite alternate;
    color: var(--text-primary);
}

/* 随机线条效果 */
.captcha-question::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(45deg, rgba(255,0,0,0.1) 10%, transparent 10%, transparent 90%, rgba(255,0,0,0.1) 90%),
        linear-gradient(-45deg, rgba(0,255,0,0.1) 10%, transparent 10%, transparent 90%, rgba(0,255,0,0.1) 90%),
        linear-gradient(90deg, rgba(0,0,255,0.1) 10%, transparent 10%, transparent 90%, rgba(0,0,255,0.1) 90%);
    background-size: 20px 20px, 30px 30px, 40px 40px;
    animation: captchaLinesMove 15s infinite linear;
    z-index: 0;
}

.captcha-question span {
    position: relative;
    z-index: 1;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.2);
    letter-spacing: 4px;
    font-family: 'Courier New', monospace;
    color: var(--text-primary);
}

.refresh-captcha-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 12px 24px;
    background: linear-gradient(135deg, #9b59b6, #8e44ad);
    border: none;
    border-radius: 25px;
    color: #ffffff;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 15px;
    font-weight: 600;
    align-self: flex-start;
    box-shadow: 0 4px 15px rgba(155, 89, 182, 0.5);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    letter-spacing: 0.3px;
}

.refresh-captcha-btn:hover {
    background: linear-gradient(135deg, #8e44ad, #9b59b6);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(155, 89, 182, 0.6);
    color: #ffffff;
}

/* 颜色变换动画 */
@keyframes captchaColorChange {
    0% {
        background-color: #dbeafe;
        color: var(--text-primary);
        border-color: #93c5fd;
    }
    25% {
        background-color: #ede9fe;
        color: var(--text-primary);
        border-color: #ddd6fe;
    }
    50% {
        background-color: #fef3c7;
        color: var(--text-primary);
        border-color: #fde68a;
    }
    75% {
        background-color: #d1fae5;
        color: var(--text-primary);
        border-color: #86efac;
    }
    100% {
        background-color: #fee2e2;
        color: var(--text-primary);
        border-color: #fecaca;
    }
}

/* 线条移动动画 */
@keyframes captchaLinesMove {
    0% {
        background-position: 0 0, 0 0, 0 0;
    }
    100% {
        background-position: 100px 100px, 150px 150px, 200px 200px;
    }
}

@media (max-width: 768px) {
    .submit-form {
        padding: 16px;
        margin: 0 10px;
    }
    
    .form-steps {
        display: flex;
        overflow-x: auto;
        margin-bottom: 20px;
        padding-bottom: 10px;
    }
    
    .step {
        white-space: nowrap;
        margin-right: 10px;
    }
    
    .form-step h2 {
        font-size: 20px;
        margin-bottom: 20px;
    }
    
    .form-group {
        margin-bottom: 16px;
    }
    
    .form-row {
        grid-template-columns: 1fr !important;
        gap: 16px;
    }
    
    .form-input,
    .form-textarea,
    .form-select,
    .form-file {
        padding: 12px;
        font-size: 14px;
    }
    
    .download-group {
        padding: 12px;
        margin-bottom: 10px;
    }
    
    .submit-btn,
    .next-step-btn,
    .prev-step-btn {
        padding: 12px 24px;
        font-size: 16px;
        width: 100%;
        justify-content: center;
        margin-top: 16px;
    }
    
    .form-actions {
        flex-direction: column;
        gap: 10px;
    }
    
    .captcha-question {
        padding: 16px;
        font-size: 16px;
        min-height: 70px;
    }
    
    .captcha-question span {
        letter-spacing: 2px;
        font-size: 14px;
    }
    
    .refresh-captcha-btn {
        padding: 8px 16px;
        font-size: 13px;
        width: 100%;
        justify-content: center;
    }
    
    .form-label {
        font-size: 14px;
    }
    
    .add-download-btn {
        width: 100%;
        justify-content: center;
        padding: 10px;
        margin-bottom: 20px;
    }
}

/* 平板设备优化 */
@media (min-width: 769px) and (max-width: 1024px) {
    .submit-form {
        max-width: 800px;
        margin: 0 auto 20px;
    }
}

/* 桌面设备优化 */
@media (min-width: 1025px) {
    .submit-form {
        max-width: 900px;
        margin: 0 auto 20px;
    }
    
    .container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 20px;
    }
}