* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: '宋体';
}
html {
    scroll-behavior: smooth;
}

header {
    height: 9vh;
    min-height: 56px;
    width: 100vw;
    background-color: brown;
    padding: 0 20px;
    border-bottom: 30px solid transparent;
    border-image-source: url(yiLine.jpg);
    border-image-slice: 0 0 100% 0;
    border-image-repeat: repeat;
    border-image-width: 0 0 30px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}
#banner {
    height: 100%;
    width: 100%;
    display: flex;
    flex-direction: row;
    align-items: center;
}
#banner_left {
    height: 100%;
    flex: 1;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 0.7em;
    min-width: 0;
}
#banner_left span:first-of-type {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
#app_icon {
    height: 80%;
    flex-shrink: 0;
}
#banner_right {
    display: flex;
    align-items: center;
    margin-right: 2em;
    flex-shrink: 0;
}
#banner_right ul {
    list-style-type: none;
    display: flex;
    flex-direction: row;
    gap: 2em;
}
#banner_right ul > li {
    width: max-content;
    cursor: pointer;
}
.banner_a {
    font-size: 1.4em;
    text-decoration: none;
    color: #ccc;
    transition: color 0.3s;
}
.banner_a:hover {
    color: #fff;
}

#mobile_menu_btn {
    display: none;
}

#container {
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

#front_view {
    width: 100%;
    min-height: 40vh;
    background-color: #000;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 3em 0;
}
#first_info {
    width: 60%;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 1em;
}
#description {
    width: 60%;
}
#description p {
    color: #fff;
    font-size: 4em;
    line-height: 1.2;
}
.btn {
    display: block;
    width: fit-content;
    color: #fff;
    background-color: #a74d04;
    text-decoration: none;
    padding: 1em 1.6em;
    border-radius: 36px;
    margin-top: 1em;
    white-space: nowrap;
}
#app_icon_pic {
    width: 40%;
    display: flex;
    justify-content: center;
    align-items: center;
}

#content {
    width: 100%;
}

#first_of_all {
    min-height: 40vh;
    padding: 3em 2em;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    background-color: #f2f5fa;
}
#first_of_all p:first-of-type {
    font-size: 3em;
    line-height: 1.2;
}
#first_of_all p:nth-of-type(2) {
    margin: 0.6em 0;
}

#features {
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 5em 1em;
    text-align: center;
}
#features > p:first-of-type {
    font-size: 3em;
    line-height: 1.2;
}
#features > p:nth-of-type(2) {
    margin: 1em 0;
}
#feature_items {
    display: flex;
    flex-direction: row;
    width: 60%;
    margin: 2em 0;
    justify-content: space-between;
    gap: 1em;
}
.items {
    min-height: 16em;
    width: 10em;
}
.small_illustrate img {
    height: 6em;
}
.small_title {
    font-size: 1.6em;
    font-weight: 600;
    margin: 0.6em 0;
}
.small_description {
    line-height: 1.5;
}

#github_info {
    width: 100%;
    min-height: 40vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 3em 0;
}
#github_overall {
    width: 50%;
    border-radius: 36px;
    display: flex;
    flex-direction: row;
    align-items: flex-start;
}
#github_pic {
    flex-shrink: 0;
}
#github_description {
    flex: 1;
}
.open_words {
    margin: 0 2em;
    line-height: 1.6;
}

#download {
    width: 100%;
    display: flex;
    justify-content: center;
    padding: 2em 0;
}
#download_content {
    width: 60%;
    display: flex;
    flex-direction: column;
}
#download_options {
    text-align: left;
}
#download_options > p:first-child {
    font-size: 3em;
    line-height: 1.2;
}
#download_options > p:nth-child(2) {
    margin: 1em 0;
}
#download_cards {
    display: flex;
    flex-direction: row;
    width: 100%;
    margin: 2em 0;
    justify-content: space-between;
    gap: 1em;
}
.download_button {
    display: block;
    height: 3em;
    width: 100%;
    text-align: center;
    line-height: 3em;
    color: #fff;
    background-color: #0f62f1;
    border: none;
    text-decoration: none;
    cursor: pointer;
    border-radius: 4px;
}
#warning {
    min-height: 22vh;
    width: 100%;
    background-color: #d7ffb8;
    padding: 1.5em 3em;
    border: 2px solid #58cc00;
    color: #59a700;
    border-radius: 36px;
    margin-bottom: 1em;
}
#warning p {
    line-height: 1.6;
}
.center_title {
    text-align: center;
    font-size: 1.2em;
    margin: 1em 0;
}

#corrector {
    width: 100%;
    display: flex;
    justify-content: center;
    padding: 2em 0;
}
#correct_method {
    width: 60%;
    min-height: auto;
}
.block_words {
    text-indent: 2em;
    line-height: 1.6em;
    margin-bottom: 0.6em;
}
#correct_content {
    width: 100%;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    padding: 2em 0;
    gap: 1em;
}
.correct_item {
    flex: 1;
    min-width: 0;
    border: 1px solid #58cc00;
    background-color: #d7ffb8;
    min-height: 8em;
    border-radius: 36px;
    padding: 1em;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    line-height: 1.6;
}

#sponsor {
    width: 100%;
    display: flex;
    justify-content: center;
    padding: 2em 0;
}
#sponsor_block {
    width: 60%;
    min-height: auto;
    padding-bottom: 2em;
}
#thank_words_title {
    font-size: 3em;
    margin: 1em 0;
}
#thank_words .block_words {
    line-height: 1.8;
}

#thank_words img {
    vertical-align: middle;
    height: 80px;
    cursor: pointer;
}

.dialogger {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    border: none;
    border-radius: 12px;
    max-width: 90vw;
    box-shadow: 0 8px 32px rgba(0,0,0,0.25);
}
.dialog_title {
    font-size: 2em;
    margin: 1em;
    line-height: 1.4;
}
.qr_code {
    text-align: center;
}
.qr_code img {
    max-width: 100%;
    height: auto;
    max-height: 50vh;
}
.close_btn {
    display: flex;
    justify-content: center;
    margin: 2em 0;
}
.close_button {
    display: block;
    height: 3em;
    width: 20vh;
    max-width: 180px;
    min-width: 100px;
    text-align: center;
    line-height: 3em;
    color: #fff;
    background-color: #0f62f1;
    border: none;
    outline: none;
    cursor: pointer;
    border-radius: 6px;
}

#back_to_top {
    position: fixed;
    right: 2em;
    bottom: 2em;
    cursor: pointer;
    z-index: 999;
}
#back_to_top img {
    height: 64px;
    display: block;
}

footer {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: #f8f8f8;
    margin-top: 5em;
    padding-bottom: 2em;
}
#infos {
    width: 60%;
    min-height: 40vh;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    padding: 2em 0;
}
#final_logo {
    width: 60%;
    min-height: 10vh;
    display: flex;
    flex-direction: row;
    align-items: center;
    border-top: 2px solid #ccc;
    padding: 1em 0;
    gap: 1em;
}
#bottom_logo {
    height: 100%;
    display: flex;
    align-items: center;
    gap: 1em;
    flex: 1;
}
#bottom_logo img {
    height: 6vh;
    min-height: 36px;
    max-height: 54px;
}
#copyright {
    display: flex;
    flex-direction: row;
    align-items: center;
    flex-shrink: 0;
}
#copyright p {
    width: max-content;
    font-size: 1.2em;
    white-space: nowrap;
}
.column_title {
    font-size: 1.2em;
    margin: 1em 0;
    text-align: center;
    font-weight: 600;
}
.column_list ul {
    list-style-type: none;
    text-align: center;
}
.column_list ul li {
    line-height: 2em;
}
.column_list ul li > a {
    text-decoration: none;
    color: #000;
}
.column_list ul li > a:hover {
    color: #a74d04;
}

/* 移动适配 */
@media screen and (max-width: 768px) {

    header {
        height: auto;
        min-height: 56px;
        padding: 8px 12px;
    }
    #banner {
        position: relative;
        align-items: center;
        min-height: 40px;
    }
    #banner_left {
        height: auto;
        gap: 0.5em;
        flex: 1;
        min-width: 0;
    }
    #banner_left span:first-of-type {
        font-size: 1.4em !important;
    }
    #banner_left span:nth-of-type(2) {
        font-size: 0.9em;
        color: #ccc;
    }
    #app_icon {
        height: 36px;
    }

    #mobile_menu_btn {
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.8rem;
        color: white;
        cursor: pointer;
        padding: 4px 8px;
        flex-shrink: 0;
        user-select: none;
        -webkit-tap-highlight-color: transparent;
    }

    #banner_right {
        display: none;
        position: absolute;
        top: calc(100% + 4px);
        right: 0;
        width: 200px;
        background: #fff;
        border-radius: 10px;
        padding: 12px;
        margin-right: 0;
        box-shadow: 0 4px 16px rgba(0,0,0,0.3);
        z-index: 1100;
    }
    #banner_right.show {
        display: block;
    }
    #banner_right ul {
        flex-direction: column;
        gap: 0.8rem;
    }
    #banner_right ul li {
        width: 100%;
    }
    .banner_a {
        color: #666;
        font-size: 1.1em;
        display: block;
        padding: 4px 0;
    }
    .banner_a:hover{
        color: #000;
    }

    #front_view {
        min-height: auto;
        padding: 3em 1.2em;
    }
    #first_info {
        width: 100%;
        flex-direction: column-reverse;
        align-items: center;
        text-align: center;
        gap: 1.5em;
    }
    #description {
        width: 100%;
    }
    #description p {
        font-size: 2em;
    }
    #app_icon_pic {
        width: auto;
    }
    #app_icon_pic img {
        height: 20vw !important;
        min-height: 80px;
        max-height: 130px;
    }
    .btn {
        margin: 1em auto 0;
    }

    #first_of_all {
        min-height: auto;
        padding: 2.5em 1.5em;
    }
    #first_of_all p:first-of-type {
        font-size: 2em;
    }
    #first_of_all .btn {
        margin: 1em auto 0;
    }

    #features {
        padding: 3em 1.2em;
    }
    #features > p:first-of-type {
        font-size: 1.8em;
    }
    #feature_items {
        width: 100%;
        flex-direction: column;
        align-items: center;
        gap: 2rem;
        margin: 1.5em 0;
    }
    .items {
        width: 100%;
        max-width: 340px;
        min-height: auto;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
    }
    .small_illustrate img {
        height: 4.5em;
    }
    .small_title {
        font-size: 1.3em;
    }

    #github_info {
        min-height: auto;
        padding: 2.5em 1.2em;
    }
    #github_overall {
        width: 100%;
        flex-direction: column;
        align-items: center;
    }
    #github_pic {
        text-align: center;
    }
    #github_pic img {
        height: 4em !important;
        margin: 1em auto !important;
        display: block;
    }
    #github_description {
        width: 100%;
    }
    .open_words {
        margin: 0;
        margin-bottom: 0.8em;
    }

    #download {
        padding: 2em 1.2em;
    }
    #download_content {
        width: 100%;
    }
    #download_options > p:first-child {
        font-size: 2em;
    }
    #download_cards {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        margin: 1.5em 0;
    }
    #download_cards .items {
        width: 100%;
        max-width: 300px;
        min-height: auto;
        align-items: center;
    }
    .small_button{
        width: 100%;
    }
    #download_button {
        padding: 0 3em;
    }
    #warning {
        min-height: auto;
        padding: 1.5em 1.5em;
        border-radius: 20px;
    }
    #warning > p:first-child {
        font-size: 1.4em !important;
        padding-top: 0 !important;
        margin-bottom: 0.5em;
    }

    #corrector {
        padding: 2em 1.2em;
    }
    #correct_method {
        width: 100%;
        min-height: auto;
    }
    #correct_title > p:first-child {
        font-size: 2em !important;
        margin: 0.5em 0 0.4em !important;
    }
    #correct_content {
        flex-direction: column;
        align-items: center;
        padding: 1.5em 0;
        gap: 1rem;
    }
    .correct_item {
        width: 100%;
        max-width: 340px;
        min-height: auto;
        padding: 1em 1.5em;
        border-radius: 20px;
    }

    #sponsor {
        padding: 2em 1.2em;
    }
    #sponsor_block {
        width: 100%;
        min-height: auto;
    }
    #thank_words_title {
        font-size: 2em;
        margin: 0.5em 0;
    }
    #thank_words img {
        height: 60px;
        display: inline-block;
        vertical-align: middle;
    }

    .dialogger {
        width: 92%;
        max-width: 380px;
        border-radius: 12px;
        padding: 0.5em;
    }
    .dialog_title {
        font-size: 1.1em;
        margin: 0.8em 0.8em 0.5em;
    }
    .qr_code img {
        max-width: 100%;
        height: auto;
        max-height: 45vw;
    }
    .close_btn {
        margin: 1.2em 0;
    }
    .close_button {
        height: 2.6em;
        line-height: 2.6em;
    }

    footer {
        margin-top: 3em;
        padding-bottom: 2em;
    }
    #infos {
        width: 100%;
        min-height: auto;
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: space-around;
        gap: 0;
        padding: 1.5em 1em;
    }
    .word-column {
        width: 48%;
        min-width: 130px;
        margin-bottom: 1.5em;
        text-align: center;
    }
    #final_logo {
        width: 100%;
        flex-direction: column;
        align-items: center;
        min-height: auto;
        padding: 1em 1em;
        gap: 0.8em;
        border-top: 2px solid #ccc;
    }
    #bottom_logo {
        justify-content: center;
        flex: none;
    }
    #bottom_logo img {
        height: 40px;
        max-height: 40px;
    }
    #copyright {
        justify-content: center;
    }
    #copyright p {
        width: auto;
        font-size: 0.9em;
        white-space: normal;
        text-align: center;
    }

    #back_to_top {
        right: 1rem;
        bottom: 1rem;
    }
    #back_to_top img {
        height: 48px !important;
    }
}

/* 适配更窄的移动端，此部分有AI辅助。 */
@media screen and (max-width: 400px) {
    #description p {
        font-size: 1.6em;
    }
    #first_of_all p:first-of-type {
        font-size: 1.6em;
    }
    #features > p:first-of-type {
        font-size: 1.5em;
    }
    #download_options > p:first-child {
        font-size: 1.7em;
    }
    #download_button {
        padding: 0 3em;
    }
    #thank_words_title {
        font-size: 1.8em;
    }
    .word-column {
        width: 100%;
    }
    #infos {
        flex-direction: column;
        align-items: center;
    }
    #copyright p {
        font-size: 0.8em;
    }
}