/* ============================================================
   contact-us.css - Contact 页面
   结构: 1. 基础样式  2. 响应式(按断点合并)
   ============================================================ */

/* ========== 1. 基础样式 ========== */
.contact-us {
    padding: 2rem 0 8rem;
}

.contact-us__title {
    font-size: clamp(2rem, 5vw, 3.0625rem);
    text-align: center;
    padding: 7rem 0 5rem;
    line-height: 1.4;
}

.contact-us__title p {
    margin: 0.5rem 0;
}

.contact-us__title-highlight {
    color: var(--color-primary);
    font-weight: 700;
    transition: color 0.3s ease;
}

.contact-us__cards {
    display: flex;
    flex-direction: row;
    gap: 2.5rem;
    margin: 0 auto;
    max-width: 1200px;
    justify-content: center;
}

.contact-us__card {
    flex: 1;
    min-width: 300px;
    max-width: 500px;
    background: #fff;
    border: 2px solid rgba(0, 0, 0, 0.08);
    border-radius: 24px;
    padding: 3rem 2.5rem;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 1.5rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.contact-us__card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 72, 31, 0.05) 0%, rgba(255, 72, 31, 0.02) 100%);
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
}

.contact-us__card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 12px 40px rgba(255, 72, 31, 0.15),
                0 4px 12px rgba(0, 0, 0, 0.08);
    transform: translateY(-4px);
}

.contact-us__card:hover::before {
    opacity: 1;
}

.contact-us__card-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 72, 31, 0.08);
    border-radius: 16px;
    color: var(--color-primary);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
}

.contact-us__card-icon svg {
    width: 32px;
    height: 32px;
    stroke-width: 2;
}

.contact-us__card:hover .contact-us__card-icon {
    background: var(--color-primary);
    color: #fff;
    transform: scale(1.1) rotate(5deg);
}

.contact-us__card-content {
    flex: 1;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.contact-us__card-label {
    font-size: var(--font-size-small);
    font-weight: 600;
    color: rgba(0, 0, 0, 0.5);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: color 0.3s ease;
}

.contact-us__card:hover .contact-us__card-label {
    color: var(--color-primary);
}

.contact-us__card-link {
    color: #000;
    text-decoration: none;
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    font-weight: 600;
    line-height: 1.4;
    transition: all 0.3s ease;
    display: inline-block;
    word-break: break-word;
}

.contact-us__card-link:hover {
    color: var(--color-primary);
    transform: translateX(4px);
}

.contact-us__cta {
    width: 100%;
    margin: 0 auto;
    text-align: center;
    padding: 150px 0;
    display: flex;
    justify-content: center;
    align-items: center;
    max-width: 280px;
}

.contact-us__cta img {
    display: block;
    width: 100%;
    height: auto;
}

/* ========== 2. 响应式 (按断点合并) ========== */

/* --- 2.1 笔记本 1024–1919px --- */
@media (min-width: 1024px) and (max-width: 1919px) {
    .contact-us {
        padding: 2rem 0 6rem;
    }
    .contact-us__title {
        padding: 5rem 0 4rem;
        font-size: clamp(1.75rem, 4vw, 2.75rem);
    }
    .contact-us__cards {
        max-width: 1000px;
        gap: 2rem;
    }
    .contact-us__card {
        padding: 2.5rem 2rem;
    }
    .contact-us__cta {
        padding: 120px 0;
        max-width: 260px;
    }
}

/* --- 2.2 平板/手机 max-width: 768px --- */
@media (max-width: 768px) {
    .contact-us {
        padding: 2rem 0 4rem;
    }

    .contact-us__title {
        padding: 4rem 0 3rem;
        font-size: clamp(1.5rem, 6vw, 2.5rem);
    }

    .contact-us__cards {
        flex-direction: column;
        gap: 1.5rem;
        padding: 0 1rem;
    }

    .contact-us__card {
        min-width: 100%;
        max-width: 100%;
        padding: 2rem 1.5rem;
    }

    .contact-us__card-icon {
        width: 56px;
        height: 56px;
    }

    .contact-us__card-icon svg {
        width: 28px;
        height: 28px;
    }
    .contact-us__cta {
        padding: 80px 0;
        max-width: 200px;
    }
}

/* --- 2.3 大屏 min-width: 1920px --- */
@media (min-width: 1920px) {
    .contact-us__cards {
        max-width: 1400px;
        gap: 3rem;
    }

    .contact-us__card {
        padding: 3.5rem 3rem;
    }

    .contact-us__card-icon {
        width: 72px;
        height: 72px;
    }

    .contact-us__card-icon svg {
        width: 36px;
        height: 36px;
    }
}