/* ============ 关于我们页 ============ */

/* 继承 .content 的背景与左侧边栏留白，整体居中限宽 */
.content-about {
    background-image: url('/img/about-bannar.png');
/*    background-position-y: -0.5rem;*/
}

/* ============ Hero ============ */
.about-hero {
    padding: 0 0 2rem;
    text-align: left;
    animation: aboutFadeUp 0.6s var(--ease) both;
}
.about-hero__badge {
    display: inline-block;
    padding: 0.375rem 2rem;
    background: var(--c-primary-soft);
    border-radius: 1.125rem;
    color: var(--c-primary);
    font-size: 0.875rem;
    line-height: 1;
    font-weight: 500;
}
.about-hero__title {
    margin: 0.875rem 0 0;
    font-size: 2.75rem;
    font-weight: 700;
    color: var(--c-text);
    line-height: 1.3;
    letter-spacing: 0.04em;
    font-family: FZLanTingYuanS-DB1-GB;
}
/* 「AI工具」渐变文字 */
.about-hero__grad {
    background-image: linear-gradient(180deg, #552ff4 0%, #964cf6 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}
.about-hero__desc {
    margin: 0.75rem 0 0;
    max-width: 26rem;
    color: var(--c-text-sub);
    font-size: 0.875rem;
    line-height: 1.85;
}

/* ============ 数据统计卡 ============ */
.about-stats {
    max-width: 39.375rem;
    margin: 0.75rem 0 0;
    padding: 1.75rem 2.5rem;
    background: #fff;
    border-radius: 0.625rem;
    box-shadow: 0 1px 10px rgba(48, 42, 65, 0.06);
    display: flex;
    flex-direction: column;
    gap: 0.875rem;
}
.about-stats__row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
}
.about-stats__num {
    font-size: 1.625rem;
    font-weight: 700;
    color: #783bf2;
    line-height: 1.3;
    text-align: center;
}
.about-stats__label {
    font-size: 0.875rem;
    color: var(--c-text);
    text-align: center;
    line-height: 1;
}

/* ============ 介绍卡片 ============ */
.about-card {
    background: #fff;
    border-radius: 1rem;
    box-shadow: 0 1px 10px rgba(48, 42, 65, 0.06);
    padding: 2.5rem 2.5rem;
    margin-top: 1.75rem;
    animation: aboutFadeUp 0.6s var(--ease) 0.1s both;
}
.about-card__heading {
    display: flex;
    align-items: center;
    gap: 0.625rem;
}
.about-card__bar {
    width: 0.25rem;
    height: 1.25rem;
    background: var(--c-primary);
    border-radius: 0.125rem;
    flex-shrink: 0;
}
.about-card__title {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--c-text);
    line-height: 1.25;
}
.about-card__text {
    margin: 1.25rem 0 0;
}
/* 段落间距：首段紧贴标题，后续段落增加上间距 */
.about-card__text + .about-card__heading {
    margin-top: 2.5rem;
}
.about-card__text p {
    margin: 0;
    font-size: 1rem;
    color: var(--c-text);
    line-height: 1.9;
}
.about-card__text p + p {
    margin-top: 1.25rem;
}

/* ============ CTA 加入我们的旅程 ============ */
.about-cta {
    text-align: center;
    margin-top: 3rem;
    padding-bottom: 1rem;
    animation: aboutFadeUp 0.6s var(--ease) 0.2s both;
}
.about-cta__title {
    margin: 0;
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--c-text);
    line-height: 1.3;
}
.about-cta__desc {
    margin: 1.875rem auto 0;
    max-width: 31rem;
    font-size: 1rem;
    color: var(--c-text);
    line-height: 1.9;
}
.about-cta__actions {
    margin-top: 2.5rem;
    display: flex;
    justify-content: center;
    gap: 1.25rem;
}
.about-btn {
    min-width: 7.5rem;
    height: 2.5rem;
    padding: 0 1rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s var(--ease), color 0.2s var(--ease),
                border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.about-btn--solid {
    background: var(--c-text);
    color: #fff;
    border: 1px solid var(--c-text);
}
.about-btn--solid:hover {
    background: var(--c-primary);
    border-color: var(--c-primary);
}
.about-btn--ghost {
    background: #fff;
    color: var(--c-text);
    border: 1px solid #f4f4f4;
}
.about-btn--ghost:hover {
    border-color: var(--c-primary);
    color: var(--c-primary);
}
.about-btn:focus-visible {
    outline: 2px solid var(--c-primary);
    outline-offset: 2px;
}

@keyframes aboutFadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ============ 提交AI工具 弹窗（遮罩 + 模态卡，照参考稿 lanhu_tijiaogongju） ============ */
.submit-mask {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(51, 51, 51, 0.6);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 5.375rem 1rem 2rem;
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s var(--ease), visibility 0.25s var(--ease);
}
.submit-mask.is-open {
    opacity: 1;
    visibility: visible;
}
.submit-modal {
    background: #fff;
    border-radius: 10px;
    width: 462px;
    max-width: 100%;
    padding: 1.25rem 0 2.5rem;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
    transform: translateY(-20px);
    transition: transform 0.25s var(--ease);
}
.submit-mask.is-open .submit-modal {
    transform: translateY(0);
}

/* 标题栏 */
.submit-modal__head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    padding: 0 1.3125rem 0 1.25rem;
}
.submit-modal__title {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--c-text);
    line-height: 1;
}
.submit-modal__subtitle {
    margin: 0.625rem 0 0;
    font-size: 0.875rem;
    color: #969ba4;
    line-height: 1;
}
.submit-modal__close {
    flex-shrink: 0;
    width: 1.5rem;
    height: 1.5rem;
    border: none;
    border-radius: 50%;
    background: #d6d7e6;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s var(--ease);
}
.submit-modal__close:hover { background: var(--c-primary-soft-2); }
.submit-modal__close svg {
    width: 0.625rem;
    height: 0.625rem;
    fill: none;
    stroke: #fff;
    stroke-width: 2.5;
    stroke-linecap: round;
}

/* 广告合作提示条 */
.submit-modal__tip {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    margin: 1.1875rem 1.3125rem 0;
    padding: 0 1rem;
    height: 3rem;
    background: #f7f3ff;
    border-radius: 8px;
}
.submit-modal__tip-ico {
    width: 0.875rem;
    height: 0.875rem;
    flex-shrink: 0;
    object-fit: contain;
}
.submit-modal__tip span {
    font-size: 0.875rem;
    color: #5833aa;
    line-height: 1;
}

/* 表单 */
.submit-form {
    padding: 0 1.3125rem;
    margin-top: 1.25rem;
}
.submit-form__field {
    margin-bottom: 1.25rem;
}
.submit-form__field:last-of-type {
    margin-bottom: 0;
}
.submit-form__label {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
    font-size: 1rem;
    color: var(--c-text);
    line-height: 1;
    margin-bottom: 0.625rem;
}
.submit-form__star {
    color: #f41010;
    font-style: normal;
    line-height: 1;
}
.submit-form__hint {
    font-size: 0.875rem;
    color: #969ba4;
    font-weight: 400;
}
.submit-form__input,
.submit-form__textarea,
.submit-form__select {
    width: 100%;
    height: 2.875rem;
    background: #fff;
    border: 1px solid #e8e8e8;
    border-radius: 8px;
    padding: 0 1.25rem;
    font-size: 0.875rem;
    color: var(--c-text);
    font-family: inherit;
    transition: border-color 0.2s var(--ease);
    box-sizing: border-box;
}
.submit-form__textarea {
    height: auto;
    min-height: 5.75rem;
    padding: 0.875rem 1.25rem;
    line-height: 1.6;
    resize: vertical;
}
.submit-form__input::placeholder,
.submit-form__textarea::placeholder,
.submit-form__placeholder {
    color: #969ba4;
}
.submit-form__input:focus,
.submit-form__textarea:focus {
    outline: none;
    border-color: var(--c-primary);
}
/* 工具分类 下拉占位 */
.submit-form__select {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    user-select: none;
}
.submit-form__caret {
    width: 2rem;
    height: 2rem;
    flex-shrink: 0;
    fill: none;
    stroke: #969ba4;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    transition: transform 0.2s var(--ease);
}
/* 展开态：箭头翻转、输入框高亮 */
.submit-form__select.is-open .submit-form__caret {
    transform: rotate(180deg);
}
.submit-form__select.is-open {
    border-color: var(--c-primary);
}
.submit-form__placeholder.is-selected {
    color: var(--c-text);
}
/* 下拉面板 */
.submit-form__dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 0;
    right: 0;
    margin: 0;
    padding: 0.5rem 0;
    list-style: none;
    background: #fff;
    border: 1px solid #e8e8e8;
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(48, 42, 65, 0.12);
    max-height: 15rem;
    overflow-y: auto;
    z-index: 10;
    /* 默认收起 */
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity 0.2s var(--ease), transform 0.2s var(--ease),
                visibility 0.2s var(--ease);
}
.submit-form__select.is-open .submit-form__dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.submit-form__option {
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    color: var(--c-text);
    line-height: 1.4;
    cursor: pointer;
    transition: background 0.15s var(--ease), color 0.15s var(--ease);
}
.submit-form__option:hover {
    background: var(--c-primary-soft);
    color: var(--c-primary);
}
/* 工具官网 带链接图标 */
.submit-form__input-wrap {
    position: relative;
}
.submit-form__input--with-icon {
    padding-right: 2.75rem;
}
.submit-form__link-ico {
    position: absolute;
    right: 1.125rem;
    top: 50%;
    transform: translateY(-50%);
    width: 0.75rem;
    height: 0.75rem;
    fill: none;
    stroke: #969ba4;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    pointer-events: none;
}
/* 提交按钮 */
.submit-form__btn {
    width: 100%;
    height: 3.375rem;
    margin-top: 1.75rem;
    border: none;
    border-radius: 10px;
    background: linear-gradient(90deg, #7f3bf4 0%, #6b3bef 100%);
    color: #fff;
    font-size: 1.125rem;
    font-family: inherit;
    cursor: pointer;
    transition: box-shadow 0.2s var(--ease), opacity 0.2s var(--ease);
}
.submit-form__btn:hover {
    box-shadow: 0 4px 16px rgba(108, 92, 231, 0.4);
}
.submit-form__btn:active {
    opacity: 0.9;
}
.submit-form__btn:focus-visible {
    outline: 2px solid var(--c-primary);
    outline-offset: 2px;
}

/* ============ 响应式 ============ */
@media (max-width: 1023px) {
    .content-about { max-width: 100%; }
    .about-hero__title { font-size: 2.25rem; }
    .about-card { padding: 2rem; }
    .submit-modal { width: 100%; max-width: 462px; }
}
@media (max-width: 767px) {
    .content-about { padding: 1.5rem 1.25rem 2rem; }
    .about-hero { padding: 2rem 0 1.5rem; }
    .about-hero__title { font-size: 1.875rem; }
    .about-stats { padding: 1.5rem 1rem; }
    .about-stats__num { font-size: 1.375rem; }
    .about-card { padding: 1.5rem; margin-top: 1.25rem; }
    .about-card__title { font-size: 1.125rem; }
    .about-cta__title { font-size: 1.5rem; }
    .about-cta__actions { gap: 0.75rem; }
    /* 弹窗移动端贴底，内容可滚动 */
    .submit-mask { padding: 0; align-items: stretch; }
    .submit-modal { border-radius: 10px 10px 0 0; max-width: 100%; }
}

/* 尊重用户的动画偏好 */
@media (prefers-reduced-motion: reduce) {
    .about-hero,
    .about-card,
    .about-cta { animation: none; }
    .about-btn { transition: none; }
}

/* 提交工具-轻量 toast */
.fb-toast {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    z-index: 10000;
    max-width: 80%;
    padding: 0.75rem 1.25rem;
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    font-size: 0.9375rem;
    line-height: 1.5;
    text-align: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
}
.fb-toast.is-show {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}
/* 提交按钮 loading 态 */
.submit-form__btn.is-loading {
    opacity: 0.7;
    cursor: not-allowed;
}