/* ==========================
   V7.5 Apple 风格 UI 重构版
   ========================== */

/* ==========================
   左侧悬浮反馈按钮与面板
   ========================== */

.feedback-float-btn {
    position: fixed;
    left: 20px;
    bottom: 30px;
    z-index: 1050;
    padding: 12px 20px;
    border-radius: 999px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    background: rgba(255, 255, 255, 0.72);
    color: #1d1d1f;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: transform 0.3s ease, opacity 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.feedback-float-btn:hover {
    transform: translateY(-2px);
}

.feedback-panel {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 1100;
    width: 380px;
    max-width: 92vw;
    background: rgba(255, 255, 255, 0.85);
    border-right: 1px solid rgba(0, 0, 0, 0.08);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    transform: translateX(-105%);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
}

.feedback-panel.open {
    transform: translateX(0);
}

/* 遮罩层 */
.feedback-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 1099;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.feedback-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* 手势指示条 */
.feedback-panel-gesture {
    display: none;
    position: absolute;
    top: 12px;
    left: 50%;
    transform: translateX(-50%);
    width: 36px;
    height: 5px;
    background: rgba(0, 0, 0, 0.15);
    border-radius: 3px;
}

[data-theme="dark"] .feedback-panel-gesture {
    background: rgba(255, 255, 255, 0.2);
}

@media (max-width: 768px) {
    .feedback-panel-gesture {
        display: block;
    }
}

.feedback-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 24px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.feedback-panel-header h3 {
    margin: 0;
    font-size: 17px;
    font-weight: 600;
    color: #1d1d1f;
}

#feedback-panel-close {
    border: none;
    background: transparent;
    color: #86868b;
    font-size: 18px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 8px;
    transition: background 0.2s ease;
}

#feedback-panel-close:hover {
    background: rgba(0, 0, 0, 0.04);
}

.feedback-panel-body {
    flex: 1;
    overflow: auto;
    padding: 20px 24px;
}

.feedback-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 13px;
    color: #86868b;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 14px;
    border-radius: 12px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    background: rgba(255, 255, 255, 0.6);
    color: #1d1d1f;
    font-size: 15px;
    line-height: 1.5;
    box-sizing: border-box;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #0071e3;
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.12);
}

.required {
    color: #ff3b30;
}

.feedback-submit-btn {
    width: 100%;
    padding: 14px;
    border-radius: 12px;
    border: none;
    background: #1d1d1f;
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.feedback-submit-btn:hover {
    opacity: 0.88;
    transform: translateY(-1px);
}

.feedback-survey-link {
    margin-top: 18px;
    padding-top: 16px;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
    text-align: center;
    font-size: 13px;
    color: #86868b;
}

.survey-link-btn {
    display: inline-block;
    margin-top: 8px;
    padding: 10px 18px;
    border-radius: 999px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    background: rgba(255, 255, 255, 0.6);
    color: #1d1d1f;
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    transition: transform 0.2s ease;
}

.survey-link-btn:hover {
    transform: translateY(-1px);
}

/* 深色模式反馈面板 */
[data-theme="dark"] .feedback-float-btn {
    background: rgba(30, 41, 59, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #f8fafc;
}

[data-theme="dark"] .feedback-panel {
    background: rgba(15, 23, 42, 0.95);
    border-right: 1px solid rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .feedback-panel-header {
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .feedback-panel-header h3 {
    color: #f8fafc;
}

[data-theme="dark"] #feedback-panel-close {
    color: #94a3b8;
}

[data-theme="dark"] #feedback-panel-close:hover {
    background: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .form-group label {
    color: #94a3b8;
}

[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group textarea {
    background: rgba(30, 41, 59, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #f8fafc;
}

[data-theme="dark"] .form-group input:focus,
[data-theme="dark"] .form-group textarea:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}

[data-theme="dark"] .feedback-submit-btn {
    background: #667eea;
}

[data-theme="dark"] .feedback-submit-btn:hover {
    background: #7c8ff5;
}

[data-theme="dark"] .feedback-survey-link {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    color: #94a3b8;
}

[data-theme="dark"] .survey-link-btn {
    background: rgba(30, 41, 59, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #f8fafc;
}

/* ==========================
   学生服务数据中心
   ========================== */

.student-data-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.data-card {
    background: rgba(255, 255, 255, 0.6);
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: 18px;
    padding: 22px 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    flex-direction: column;
    gap: 6px;
    transition: transform 0.3s ease, background 0.3s ease;
}

.data-card:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.85);
}

.data-content h3 {
    margin: 0;
    font-size: 26px;
    font-weight: 700;
    letter-spacing: -0.3px;
    color: #1d1d1f;
}

.data-content p {
    margin: 4px 0 0;
    font-size: 13px;
    color: #86868b;
}

/* 深色模式适配 */
[data-theme="dark"] .data-card {
    background: rgba(30, 41, 59, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .data-card:hover {
    background: rgba(30, 41, 59, 0.95);
}

[data-theme="dark"] .data-content h3 {
    color: #f8fafc;
}

[data-theme="dark"] .data-content p {
    color: #94a3b8;
}

/* ==========================
   热门搜索关键词（全宽 + 毛玻璃 + 悬浮动效）
   ========================== */

.search-card {
    background: rgba(255, 255, 255, 0.55);
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: 18px;
    padding: 32px 28px;
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
}

.search-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 100px;
}

.search-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 18px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.65);
    border: 1px solid rgba(0, 0, 0, 0.06);
    color: #1d1d1f;
    cursor: pointer;
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), background 0.3s ease, box-shadow 0.3s ease;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    font-size: 14px;
    font-weight: 500;
}

.search-tag:hover {
    transform: translateY(-4px);
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
}

.search-tag small {
    font-size: 11px;
    color: #86868b;
    font-weight: 500;
}

/* 深色模式适配 */
[data-theme="dark"] .search-card {
    background: rgba(30, 41, 59, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .search-tag {
    background: rgba(30, 41, 59, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #f8fafc;
}

[data-theme="dark"] .search-tag:hover {
    background: rgba(30, 41, 59, 0.95);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .search-tag small {
    color: #94a3b8;
}

/* ==========================
   热门下载排行榜（列表风格）
   ========================== */

.download-table {
    width: 100%;
    background: rgba(255, 255, 255, 0.4);
    border: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: 18px;
    overflow: hidden;
}

.download-row {
    display: grid;
    grid-template-columns: 48px 1fr 130px 110px;
    gap: 20px;
    align-items: center;
    padding: 15px 20px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
    transition: background 0.25s ease;
}

.download-row:last-child {
    border-bottom: none;
}

.download-row:hover {
    background: rgba(255, 255, 255, 0.7);
}

.download-rank {
    font-size: 14px;
    font-weight: 600;
    color: #86868b;
    text-align: center;
}

.download-rank.rank-top {
    color: #bf4800;
    font-weight: 700;
}

.download-name {
    font-size: 14px;
    font-weight: 500;
    color: #1d1d1f;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.download-category {
    font-size: 13px;
    color: #86868b;
}

.download-count {
    font-size: 13px;
    color: #86868b;
    text-align: right;
    font-variant-numeric: tabular-nums;
}

/* 深色模式适配 */
[data-theme="dark"] .download-table {
    background: rgba(30, 41, 59, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .download-row {
    border-bottom-color: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .download-row:hover {
    background: rgba(30, 41, 59, 0.8);
}

[data-theme="dark"] .download-rank {
    color: #94a3b8;
}

[data-theme="dark"] .download-rank.rank-top {
    color: #f97316;
}

[data-theme="dark"] .download-name {
    color: #f8fafc;
}

[data-theme="dark"] .download-category,
[data-theme="dark"] .download-count {
    color: #94a3b8;
}

.empty-tip {
    color: #86868b;
    font-size: 13px;
    text-align: center;
    padding: 20px 0;
}

/* ==========================
   底部品牌区
   ========================== */

.site-footer-mini {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px 50px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.footer-mini-line {
    width: 100%;
    height: 1px;
    background: rgba(0, 0, 0, 0.08);
    margin-bottom: 28px;
}

.footer-mini-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.footer-mini-logo {
    width: 30px;
    height: 30px;
    border-radius: 9px;
    background: linear-gradient(135deg, #1d1d1f, #434343);
    color: white;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 1px;
}

.footer-mini-name {
    margin: 0;
    font-size: 13px;
    color: #86868b;
    font-weight: 500;
    letter-spacing: -0.1px;
}

.footer-mini-version {
    margin: 0;
    font-size: 11px;
    color: #86868b;
    opacity: 0.6;
    font-weight: 400;
}

/* 深色模式底部品牌区 */
[data-theme="dark"] .footer-mini-line {
    background: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .footer-mini-logo {
    background: linear-gradient(135deg, #334155, #475569);
}

[data-theme="dark"] .footer-mini-name,
[data-theme="dark"] .footer-mini-version {
    color: #94a3b8;
}

/* ==========================
   移动端适配
   ========================== */

@media (max-width: 1024px) {
    .student-data-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .download-row {
        grid-template-columns: 40px 1fr 110px 90px;
        gap: 14px;
    }
}

@media (max-width: 768px) {
    .student-data-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .data-card {
        padding: 18px 16px;
    }

    .data-content h3 {
        font-size: 22px;
    }

    .search-card {
        padding: 24px 18px;
    }

    .download-row {
        grid-template-columns: 36px 1fr 100px 80px;
        gap: 10px;
        padding: 12px 14px;
    }

    .download-name {
        font-size: 13px;
    }

    .feedback-panel {
        width: 100%;
        max-width: 100%;
        border-right: none;
    }
}

/* 超小屏适配：375 / 390 / 414 */
@media (max-width: 420px) {
    .navbar {
        padding: 14px 16px;
    }

    .logo {
        font-size: 15px;
    }

    .hero {
        padding: 36px 16px 28px;
    }

    .hero-mission {
        font-size: 17px;
    }

    .search-box {
        padding: 13px 14px;
        font-size: 14px;
    }

    .card-grid {
        padding: 10px;
        gap: 10px;
    }

    .card {
        padding: 18px;
    }

    .home-section {
        margin: 44px auto;
        padding: 0 14px;
    }

    .section-header h2 {
        font-size: 20px;
    }

    .student-data-grid {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }

    .data-card {
        padding: 16px 14px;
    }

    .data-content h3 {
        font-size: 20px;
    }

    .search-card {
        padding: 20px 14px;
    }

    .search-tags {
        gap: 10px;
        min-height: 70px;
    }

    .search-tag {
        padding: 8px 14px;
        font-size: 13px;
    }

    .download-row {
        grid-template-columns: 30px 1fr;
        gap: 8px;
        padding: 10px 10px;
    }

    .download-category,
    .download-count {
        font-size: 11px;
    }

    .feedback-float-btn {
        left: 14px;
        bottom: 20px;
        padding: 10px 16px;
        font-size: 13px;
    }

    .site-footer-mini {
        padding: 0 16px 40px;
    }

    .footer-mini-logo {
        width: 26px;
        height: 26px;
        font-size: 10px;
    }

    .footer-mini-name {
        font-size: 12px;
    }

    .footer-mini-version {
        font-size: 10px;
    }
}