/* ========== 关于系统页面样式 ========== */

/* 顶部品牌横幅 */
.about-hero {
    position: relative;
    background: linear-gradient(135deg, #4A90D9 0%, #6C5CE7 50%, #a855f7 100%);
    border-radius: var(--radius-lg);
    padding: 60px 40px;
    text-align: center;
    overflow: hidden;
    margin-bottom: 32px;
}

.hero-bg-pattern {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.06) 0%, transparent 40%),
        radial-gradient(circle at 60% 80%, rgba(255, 255, 255, 0.05) 0%, transparent 40%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-icon-wrapper {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    animation: heroIconFloat 3s ease-in-out infinite;
}

.hero-icon-wrapper i {
    font-size: 40px;
    color: #fff;
}

.hero-icon-wrapper img {
    width: 48px;
    height: 48px;
    object-fit: contain;
    filter: brightness(0) invert(1);
}

@keyframes heroIconFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.hero-title {
    font-size: 36px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
    letter-spacing: 2px;
}

.hero-subtitle {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 8px;
    font-weight: 500;
    letter-spacing: 4px;
}

.hero-desc {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.75);
    max-width: 500px;
    margin: 0 auto;
    line-height: 1.6;
}

/* 核心理念 */
.about-philosophy {
    margin-bottom: 32px;
}

.philosophy-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    padding: 40px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.philosophy-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
}

.philosophy-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, rgba(74, 144, 217, 0.1), rgba(108, 92, 231, 0.1));
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.philosophy-icon i {
    font-size: 26px;
    color: var(--primary);
}

.philosophy-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.philosophy-text {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    max-width: 700px;
    margin: 0 auto;
}

.philosophy-text strong {
    color: var(--primary);
    font-weight: 600;
}

/* 通用标题 */
.section-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 22px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 28px;
}

.section-title i {
    font-size: 24px;
    color: var(--primary);
}

/* AI赋能教育 - 功能卡片 */
.about-features {
    margin-bottom: 32px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.feature-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    padding: 28px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.feature-card:hover::after {
    opacity: 1;
}

.feature-icon-wrap {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.feature-icon-wrap i {
    font-size: 24px;
    color: #fff;
}

.feature-icon-wrap.bg-blue {
    background: linear-gradient(135deg, #4A90D9, #6BA3E0);
}

.feature-icon-wrap.bg-purple {
    background: linear-gradient(135deg, #6C5CE7, #a855f7);
}

.feature-icon-wrap.bg-green {
    background: linear-gradient(135deg, #00B894, #55efc4);
}

.feature-icon-wrap.bg-orange {
    background: linear-gradient(135deg, #E17055, #fab1a0);
}

.feature-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.feature-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
}

/* 为什么选择我们 */
.about-advantages {
    margin-bottom: 32px;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.advantage-item {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    padding: 28px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    display: flex;
    gap: 20px;
    align-items: flex-start;
    transition: all 0.3s ease;
}

.advantage-item:hover {
    box-shadow: var(--shadow-md);
    border-color: rgba(74, 144, 217, 0.3);
}

.advantage-number {
    font-size: 32px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    flex-shrink: 0;
    min-width: 48px;
}

.advantage-content h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.advantage-content p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
}

/* 应用场景 - 时间线 */
.about-scenarios {
    margin-bottom: 32px;
}

.scenarios-timeline {
    position: relative;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.scenarios-timeline::before {
    content: '';
    position: absolute;
    top: 28px;
    left: 40px;
    right: 40px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent), var(--success), var(--warning));
    border-radius: 2px;
    z-index: 0;
}

.scenario-item {
    text-align: center;
    position: relative;
    z-index: 1;
}

.scenario-dot {
    width: 16px;
    height: 16px;
    background: var(--primary);
    border: 3px solid var(--bg-body);
    border-radius: 50%;
    margin: 20px auto 20px;
    box-shadow: 0 0 0 3px var(--primary);
}

.scenario-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    padding: 24px 16px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.scenario-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.scenario-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, rgba(74, 144, 217, 0.1), rgba(108, 92, 231, 0.1));
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
}

.scenario-icon i {
    font-size: 22px;
    color: var(--primary);
}

.scenario-card h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.scenario-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* 底部引用 */
.about-quote {
    margin-bottom: 32px;
}

.quote-card {
    background: linear-gradient(135deg, rgba(74, 144, 217, 0.05), rgba(108, 92, 231, 0.05));
    border-radius: var(--radius-md);
    padding: 40px;
    text-align: center;
    border: 1px solid rgba(74, 144, 217, 0.15);
    position: relative;
}

.quote-icon {
    font-size: 48px;
    color: rgba(74, 144, 217, 0.2);
    position: absolute;
    top: 16px;
    left: 24px;
}

.quote-card blockquote {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    font-style: italic;
    max-width: 650px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

/* 系统信息 */
.about-info {
    margin-bottom: 16px;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.info-item {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.info-item i {
    font-size: 24px;
    color: var(--primary);
}

.info-label {
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.info-value {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

/* 页面入场动画 */
.about-hero,
.about-philosophy,
.about-features,
.about-advantages,
.about-scenarios,
.about-quote,
.about-info {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease forwards;
}

.about-philosophy { animation-delay: 0.1s; }
.about-features { animation-delay: 0.2s; }
.about-advantages { animation-delay: 0.3s; }
.about-scenarios { animation-delay: 0.4s; }
.about-quote { animation-delay: 0.5s; }
.about-info { animation-delay: 0.6s; }

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

/* 响应式 */
@media (max-width: 1024px) {
    .features-grid,
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .scenarios-timeline {
        grid-template-columns: repeat(2, 1fr);
    }

    .scenarios-timeline::before {
        display: none;
    }

    .info-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .about-hero {
        padding: 40px 20px;
    }

    .hero-title {
        font-size: 28px;
    }

    .hero-subtitle {
        font-size: 15px;
        letter-spacing: 2px;
    }

    .philosophy-card {
        padding: 24px;
    }

    .features-grid,
    .advantages-grid,
    .scenarios-timeline,
    .info-grid {
        grid-template-columns: 1fr;
    }

    .advantage-item {
        padding: 20px;
    }

    .quote-card {
        padding: 24px;
    }

    .quote-card blockquote {
        font-size: 14px;
    }
}