/* 变量定义 */
:root {
    --primary-gradient: linear-gradient(135deg, #0f2027 0%, #203a43 50%, #2c5364 100%);
    --accent-color: #00d4ff;
    --accent-glow: rgba(0, 212, 255, 0.5);
    --accent-secondary: #00ff88;
    --bg-dark: #0a0e17;
    --bg-card: rgba(15, 25, 40, 0.85);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);
    --border-color: rgba(0, 212, 255, 0.2);
    --border-GL: rgba(0, 212, 255, 0.4);
    --success-color: #00ff88;
    --error-color: #ff4757;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

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

html {
    scroll-behavior: smooth
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh
}

#particles-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    z-index: -1
}

#particles-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: radial-gradient(circle at 20% 80%, rgba(0, 212, 255, 0.1) 0%, transparent 50%), radial-gradient(circle at 80% 20%, rgba(0, 255, 136, 0.1) 0%, transparent 50%);
    animation: pulse 8s ease-in-out infinite
}

#particles-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1
    }

    50% {
        opacity: 0.7
    }
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    position: relative;
    z-index: 1
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-card)
}

.logoection {
    display: flex;
    align-items: center;
    gap: var(--spacing-md)
}

.network-icon {
    width: 64px;
    height: 64px;
    color: var(--accent-color);
    filter: drop-shadow(0 0 10px var(--accent-glow))
}

.network-icon .led {
    animation: ledBlink 1s ease-in-out infinite alternate
}

@keyframes ledBlink {
    0% {
        opacity: 0.3
    }

    100% {
        opacity: 1
    }
}

.title-section {
    display: flex;
    flex-direction: column;
    gap: 4px
}

.main-title {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text
}

.subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary)
}

.course-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.2), rgba(0, 255, 136, 0.2));
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-size: 0.9rem;
    color: var(--accent-color)
}

.badge-icon {
    font-size: 1.2rem
}

.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-card);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
    transition: var(--transition-normal)
}

.card:hover {
    border-color: var(--border-glow)
}

.card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(0, 255, 136, 0.05));
    border-bottom: 1px solid var(--border-color)
}

.card-icon {
    font-size: 1.5rem
}

.card-header h2 {
    font-size: 1.2rem;
    font-weight: 600
}

.card-body {
    padding: var(--spacing-lg)
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md)
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs)
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary)
}

.required {
    color: var(--error-color)
}

/* 强制深色主题输入框 */
.form-group input,
.form-group textarea,
textarea,
input[type="text"],
input[type="email"] {
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(10, 20, 35, 0.7) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: var(--radius-sm);
    color: var(--text-primary) !important;
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition-fast);
    resize: vertical;
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.3) !important
}

.form-group input:focus,
.form-group textarea:focus,
textarea:focus,
input:focus {
    outline: none;
    border-color: var(--accent-color) !important;
    background: rgba(15, 30, 50, 0.85) !important;
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.4), 0 0 20px rgba(0, 212, 255, 0.2) !important
}

.form-group input::placeholder,
.form-group textarea::placeholder,
textarea::placeholder,
input::placeholder {
    color: rgba(0, 212, 255, 0.4) !important;
    font-weight: 300
}

.objectives-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md)
}

.objectives-list li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: rgba(0, 212, 255, 0.05);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--accent-color)
}

.objective-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-secondary));
    border-radius: 50%;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--bgdark);
    flex-shrink: 0
}

.steps-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md)
}

.step-item {
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: var(--transition-normal)
}

.step-item:hover {
    border-color: var(--border-glow)
}

.step-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(0, 212, 255, 0.08);
    cursor: pointer
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-secondary));
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--bg-dark);
    flex-shrink: 0
}

.step-title {
    font-size: 0.95rem;
    font-weight: 500
}

.step-content {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    border-top: 1px solid var(--border-color)
}

.command-hint {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    background: rgba(0, 0, 0, 0.4);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--accent-secondary)
}

.command-hint code {
    font-family: 'Consolas', monospace;
    font-size: 0.85rem;
    color: var(--accent-secondary)
}

.screenshot-upload {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs)
}

.upload-area {
    position: relative;
    min-height: 120px;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
    overflow: hidden
}

.upload-area:hover {
    border-color: var(--accent-color);
    background: rgba(0, 212, 255, 0.05)
}

.upload-area.has-image {
    border-style: solid;
    border-color: var(--accent-color)
}

.upload-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-muted);
    text-align: center;
    padding: var(--spacing-md)
}

.upload-icon {
    font-size: 2rem;
    opacity: 0.6
}

.upload-area.has-image .upload-placeholder {
    display: none
}

.preview-image {
    max-width: 100%;
    max-height: 300px;
    object-fit: contain;
    display: none
}

.upload-area.has-image .preview-image {
    display: block
}

.success-toggle {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs)
}

.toggle-buttons {
    display: flex;
    gap: var(--spacing-sm)
}

.toggle-btn {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: rgba(0, 0, 0, 0.3);
    color: var(--text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition-fast)
}

.toggle-btn:hover {
    border-color: var(--text-secondary)
}

.toggle-btn.success.active {
    background: linear-gradient(135deg, rgba(0, 255, 136, 0.2), rgba(0, 255, 136, 0.1));
    border-color: var(--success-color);
    color: var(--success-color)
}

.toggle-btn.fail.active {
    background: linear-gradient(135deg, rgba(255, 71, 87, 0.2), rgba(255, 71, 87, 0.1));
    border-color: var(--error-color);
    color: var(--error-color)
}

.question-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md)
}

.question-item:last-child {
    margin-bottom: 0
}

.question-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-secondary));
    border-radius: var(--radius-sm);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--bg-dark);
    flex-shrink: 0
}

.question-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm)
}

.question-text {
    font-size: 1rem;
    line-height: 1.6
}

.ai-tips {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm)
}

.tip-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(0, 255, 136, 0.05));
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--accent-color)
}

.tip-icon {
    font-size: 1.3rem
}

.submit-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg)
}

.auto-save-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-muted);
    font-size: 0.85rem;
    opacity: 0;
    transition: var(--transition-fast)
}

.auto-save-indicator.visible {
    opacity: 1
}

.save-icon {
    animation: savePulse 1s ease-in-out infinite
}

@keyframes savePulse {

    0%,
    100% {
        opacity: 1
    }

    50% {
        opacity: 0.5
    }
}

.submit-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background: linear-gradient(135deg, var(--accent-color), var(--accent-secondary));
    border: none;
    border-radius: 50px;
    color: var(--bg-dark);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    box-shadow: 0 4px 20px var(--accent-glow)
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px var(--accent-glow)
}

.btn-icon {
    font-size: 1.3rem;
    transition: var(--transition-fast)
}

.submit-btn:hover .btn-icon {
    transform: translateX(4px)
}

.submit-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 14, 23, 0.95);
    backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 1;
    transition: var(--transition-normal)
}

.submit-overlay.hidden {
    opacity: 0;
    pointer-events: none
}

.overlay-content {
    text-align: center;
    padding: var(--spacing-xl);
    max-width: 500px
}

.loading-spinner {
    position: relative;
    width: 100px;
    height: 100px;
    margin: 0 auto var(--spacing-lg)
}

.spinner-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 3px solid transparent;
    border-radius: 50%
}

.spinner-ring:nth-child(1) {
    border-top-color: var(--accent-color);
    animation: spin 1.5s linear infinite
}

.spinner-ring:nth-child(2) {
    width: 80%;
    height: 80%;
    top: 10%;
    left: 10%;
    border-right-color: var(--accent-secondary);
    animation: spin 1.2s linear infinite reverse
}

.spinner-ring:nth-child(3) {
    width: 60%;
    height: 60%;
    top: 20%;
    left: 20%;
    border-bottom-color: var(--accent-color);
    animation: spin 1s linear infinite
}

@keyframes spin {
    0% {
        transform: rotate(0deg)
    }

    100% {
        transform: rotate(360deg)
    }
}

.loading-title {
    font-size: 1.5rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs)
}

.loading-subtitle {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg)
}

.progress-bar {
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: var(--spacing-lg)
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent-color), var(--accent-secondary));
    border-radius: 2px;
    transition: width 0.5s ease
}

.analysis-steps {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: left
}

.analysis-step {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    transition: var(--transition-fast)
}

.analysis-step.active {
    color: var(--text-primary);
    background: rgba(0, 212, 255, 0.1)
}

.analysis-step.completed {
    color: var(--success-color)
}

.analysis-step.completed .step-check {
    color: var(--success-color)
}

.success-phase {
    animation: fadeIn 0.5s ease
}

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

    to {
        opacity: 1;
        transform: translateY(0)
    }
}

.success-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    animation: successPop 0.5s ease
}

@keyframes successPop {
    0% {
        transform: scale(0)
    }

    50% {
        transform: scale(1.2)
    }

    100% {
        transform: scale(1)
    }
}

.success-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--success-color);
    margin-bottom: var(--spacing-xs)
}

.success-subtitle {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg)
}

.submission-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg)
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center
}

.info-label {
    color: var(--text-muted)
}

.info-value {
    color: var(--text-primary);
    font-weight: 500
}

.close-btn {
    padding: var(--spacing-sm) var(--spacing-xl);
    background: linear-gradient(135deg, var(--accent-color), var(--accent-secondary));
    border: none;
    border-radius: 50px;
    color: var(--bg-dark);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal)
}

.close-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px var(--accent-glow)
}

.hidden {
    display: none !important
}

@media(max-width:768px) {
    .container {
        padding: var(--spacing-md)
    }

    .header {
        flex-direction: column;
        text-align: center;
        padding: var(--spacing-md)
    }

    .logo-section {
        flex-direction: column
    }

    .main-title {
        font-size: 1.4rem
    }

    .form-grid {
        grid-template-columns: 1fr
    }

    .question-item {
        flex-direction: column
    }

    .question-number {
        width: 40px;
        height: 40px;
        font-size: 1rem
    }

    .card-body {
        padding: var(--spacing-md)
    }

    .submit-btn {
        width: 100%;
        justify-content: center
    }
}

@media(max-width:480px) {
    .main-title {
        font-size: 1.2rem
    }

    .step-header {
        flex-wrap: wrap
    }

    .toggle-buttons {
        flex-direction: column
    }
}