/**
 * StellaVita 更新日志页面样式
 *
 * 使用项目自定义属性确保样式统一
 * 自定义属性定义在 /assets/css/root.css
 */

/* ================================
   页面头部区域
   ================================ */

.changelog-header {
    text-align: center;
    padding: 3rem 0 2rem;
}

.changelog-header__title {
    font-family: var(--thm-font);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--thm-black);
    margin-bottom: 1rem;
}

.changelog-header__description {
    font-family: var(--thm-font2);
    font-size: 1.1rem;
    color: var(--thm-gray);
    max-width: 800px;
    margin: 0 auto;
}

@media screen and (max-width: 767px) {
    .atf-page-heading.atf-align-left {
        height: 480px;
        min-height: 480px;
    }

    .atf-page-heading.atf-align-left > .container {
        padding-bottom: 54px;
    }
}

/* ================================
   筛选器区域
   ================================ */

.changelog-filter {
    background: var(--color-white);
    border: 1px solid var(--navv2-border);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--navv2-outer-shadow);
}

.changelog-filter__label {
    font-family: var(--thm-font);
    font-weight: 600;
    color: var(--thm-black);
    margin-bottom: 1rem;
    font-size: 1rem;
}

.changelog-filter .form-control,
.changelog-filter .form-select {
    border: 1px solid #dee2e6;
    border-radius: 8px;
    padding: 0.6rem 1rem;
    font-family: var(--thm-font2);
    font-size: 0.95rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    background-color: var(--color-white);
    color: var(--thm-black);
}

.changelog-filter .form-control:focus,
.changelog-filter .form-select:focus {
    border-color: var(--thm-color);
    box-shadow: 0 0 0 0.2rem rgba(58, 151, 255, 0.15);
    outline: none;
    background-color: var(--color-white);
}

.changelog-filter .form-control::placeholder {
    color: #6c757d;
    opacity: 1;
}

/* ================================
   加载状态
   ================================ */

.changelog-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    min-height: 300px;
}

.changelog-loading .spinner-border {
    width: 3rem;
    height: 3rem;
    color: var(--thm-color);
}

.changelog-loading__text {
    font-family: var(--thm-font2);
    font-size: 1rem;
    color: var(--thm-gray);
    margin-top: 1rem;
}

/* ================================
   错误状态
   ================================ */

.changelog-error {
    text-align: center;
    padding: 3rem 2rem;
    background: var(--color-white);
    border-radius: 12px;
    border: 1px solid #f8d7da;
}

.changelog-error__icon {
    font-size: 3rem;
    color: var(--color-pink);
    margin-bottom: 1rem;
}

.changelog-error__title {
    font-family: var(--thm-font);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--thm-black);
    margin-bottom: 0.5rem;
}

.changelog-error__message {
    font-family: var(--thm-font2);
    font-size: 1rem;
    color: var(--thm-gray);
    margin-bottom: 1.5rem;
}

.changelog-error__retry {
    display: inline-block;
    padding: 0.6rem 1.5rem;
    background: var(--thm-color);
    color: var(--color-white);
    border: none;
    border-radius: 22px;
    font-family: var(--thm-font);
    font-weight: 500;
    cursor: pointer;
    transition: background 0.3s ease;
}

.changelog-error__retry:hover {
    background: var(--thm-base);
}

/* ================================
   快速导航区域
   ================================ */

.changelog-quick-nav {
    background: var(--color-white);
    border: 1px solid var(--navv2-border);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.changelog-quick-nav__label {
    font-family: var(--thm-font);
    font-weight: 600;
    color: var(--thm-black);
    margin-bottom: 1rem;
    font-size: 1rem;
}

.changelog-quick-nav__buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.changelog-quick-nav__btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    margin: 0.25rem;
    background: transparent;
    color: var(--thm-color);
    border: 1px solid var(--thm-color);
    border-radius: 22px;
    font-family: var(--thm-font2);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.changelog-quick-nav__btn:hover {
    background: var(--thm-color);
    color: var(--color-white);
}

.changelog-quick-nav__btn--active,
.changelog-quick-nav__btn--active:hover {
    background: var(--thm-color);
    color: var(--color-white);
    box-shadow: 0 0 0 3px rgba(58, 151, 255, 0.15);
}

/* ================================
   折叠面板区域
   ================================ */

.accordion {
    --bs-accordion-bg: var(--color-white);
    --bs-accordion-border-color: var(--navv2-border);
    --bs-accordion-color: var(--thm-black);
    --bs-accordion-btn-bg: var(--thm-f6);
    --bs-accordion-btn-color: var(--thm-black);
    --bs-accordion-btn-focus-border-color: var(--thm-color);
    --bs-accordion-btn-focus-box-shadow: 0 0 0 0.2rem rgba(58, 151, 255, 0.15);
    --bs-accordion-active-bg: var(--thm-f6);
    --bs-accordion-active-color: var(--thm-color);
}

/* 折叠面板头部 */
.accordion-button {
    font-family: var(--thm-font);
    font-weight: 600;
    font-size: 1.1rem;
    padding: 1.25rem;
}

.accordion-button:not(.collapsed) {
    color: var(--thm-color);
    background: var(--thm-f6);
}

.accordion-button:focus {
    border-color: var(--thm-color);
    box-shadow: 0 0 0 0.2rem rgba(58, 151, 255, 0.15);
}

/* 折叠面板主体 */
.accordion-body {
    padding: 1.5rem;
    font-family: var(--thm-font2);
    color: var(--thm-p);
    line-height: 1.7;
}

/* 版本列表 */
.changelog-version-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.changelog-version-list__item {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--thm-fb);
    display: flex;
    align-items: flex-start;
}

.changelog-version-list__item:last-child {
    border-bottom: none;
}

.changelog-version-list__icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    margin-right: 0.75rem;
    margin-top: 0.1rem;
}

.changelog-version-list__icon--feature {
    color: var(--thm-color);
}

.changelog-version-list__icon--fix {
    color: var(--color-green);
}

.changelog-version-list__icon--improvement {
    color: var(--color-orange);
}

.changelog-version-list__icon--upgrade {
    color: var(--color-pink);
}

.changelog-version-list__text {
    flex: 1;
    font-size: 0.95rem;
    line-height: 1.6;
}

/* 版本标签 */
.changelog-version-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    margin-right: 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.changelog-version-tag--app {
    background: rgba(58, 151, 255, 0.1);
    color: var(--thm-color);
    /* 品牌词需要保持原始大小写，避免 "StellaVita App" 被强制转换成全大写 */
    text-transform: none;
    /* 关闭全大写配套字间距，避免正常大小写下字母间距过大 */
    letter-spacing: normal;
}

.changelog-version-tag--firmware {
    background: rgba(168, 80, 103, 0.1);
    color: var(--color-pink);
    /* 品牌词需要保持原始大小写，避免 "StellaVita Firmware" 被强制转换成全大写 */
    text-transform: none;
    /* 关闭全大写配套字间距，避免正常大小写下字母间距过大 */
    letter-spacing: normal;
}

.changelog-version-tag--station {
    background: rgba(140, 55, 67, 0.1);
    color: var(--color-orange);
}

/* ================================
   分页区域
   ================================ */

.changelog-pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem 0;
    gap: 0.5rem;
}

.changelog-pagination__btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 0.75rem;
    background: var(--color-white);
    color: var(--thm-black);
    border: 1px solid var(--navv2-border);
    border-radius: 22px;
    font-family: var(--thm-font2);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.changelog-pagination__btn:hover:not(:disabled) {
    background: var(--thm-color);
    color: var(--color-white);
    border-color: var(--thm-color);
}

.changelog-pagination__btn--active {
    background: var(--thm-color);
    color: var(--color-white);
    border-color: var(--thm-color);
}

.changelog-pagination__btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.changelog-pagination__info {
    font-family: var(--thm-font2);
    font-size: 0.9rem;
    color: var(--thm-gray);
    padding: 0 1rem;
}

/* ================================
   统计信息
   ================================ */

.changelog-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 2rem;
}

.changelog-stats__item {
    flex: 1;
    min-width: 150px;
    background: var(--color-white);
    border: 1px solid var(--navv2-border);
    border-radius: 10px;
    padding: 1.25rem;
    text-align: center;
}

.changelog-stats__number {
    font-family: var(--thm-font);
    font-size: 2rem;
    font-weight: 700;
    color: var(--thm-color);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.changelog-stats__label {
    font-family: var(--thm-font2);
    font-size: 0.9rem;
    color: var(--thm-gray);
}

/* ================================
   无数据提示
   ================================ */

.changelog-empty {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--color-white);
    border-radius: 12px;
    border: 1px solid var(--navv2-border);
}

.changelog-empty__icon {
    font-size: 4rem;
    color: var(--thm-ase);
    margin-bottom: 1rem;
}

.changelog-empty__title {
    font-family: var(--thm-font);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--thm-black);
    margin-bottom: 0.5rem;
}

.changelog-empty__message {
    font-family: var(--thm-font2);
    font-size: 1rem;
    color: var(--thm-gray);
}

/* Phase 8 visual spec alignment */
.atf-page-heading.atf-align-left {
    height: 640px;
    min-height: 640px;
}

.atf-page-heading.atf-align-left .atf-page-heading-title {
    font-size: 48px;
    line-height: 56px;
    font-weight: 500;
    letter-spacing: 0;
}

.changelog-header__title {
    font-size: 32px;
    line-height: 40px;
    font-weight: 500;
    letter-spacing: 0;
}

.changelog-header__description,
.changelog-version-list__text,
.accordion-body,
.changelog-empty__message,
.changelog-error__message {
    font-size: 16px;
    line-height: 24px;
}

.changelog-filter,
.changelog-quick-nav,
.changelog-error,
.changelog-stats__item,
.changelog-empty,
.accordion-item {
    border-radius: 8px;
}

.changelog-version-tag,
.changelog-version-tag--app,
.changelog-version-tag--firmware {
    letter-spacing: 0;
}

.changelog-error__title,
.changelog-empty__title {
    font-size: 24px;
    line-height: 32px;
    font-weight: 500;
    letter-spacing: 0;
}

/* ================================
   返回顶部按钮
   ================================ */

.changelog-back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--thm-color);
    color: var(--color-white);
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: var(--navv2-outer-shadow);
    z-index: 1000;
}

.changelog-back-to-top--visible {
    opacity: 1;
    visibility: visible;
}

.changelog-back-to-top:hover {
    background: var(--thm-base);
    transform: translateY(-3px);
}

/* ================================
   响应式设计
   ================================ */

@media (max-width: 768px) {
    .atf-page-heading.atf-align-left {
        height: 480px;
        min-height: 480px;
    }

    .atf-page-heading.atf-align-left .atf-page-heading-title {
        font-size: 28px;
        line-height: 36px;
        font-weight: 500;
    }

    .changelog-header__title {
        font-size: 24px;
        line-height: 32px;
        font-weight: 500;
    }

    .changelog-header__description {
        font-size: 16px;
        line-height: 24px;
        padding: 0 1rem;
    }

    .changelog-error__title,
    .changelog-empty__title {
        font-size: 20px;
        line-height: 28px;
    }

    .changelog-filter {
        padding: 1rem;
    }

    .changelog-quick-nav {
        padding: 1rem;
    }

    .changelog-stats__item {
        min-width: 100px;
        padding: 1rem;
    }

    .changelog-stats__number {
        font-size: 1.5rem;
    }

    .changelog-error__retry,
    .changelog-quick-nav__btn {
        border-radius: 21px;
    }

    .changelog-back-to-top {
        bottom: 1rem;
        right: 1rem;
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 576px) {
    .accordion-button {
        font-size: 1rem;
        padding: 1rem;
    }

    .accordion-body {
        padding: 1rem;
    }

    .changelog-pagination {
        flex-wrap: wrap;
    }

    .changelog-pagination__btn {
        min-width: 36px;
        height: 36px;
        font-size: 0.85rem;
        border-radius: 21px;
    }
}