html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    overflow-x: hidden;
    word-break: break-word;
}

img,
picture,
video,
canvas,
svg,
iframe {
    max-width: 100%;
}

img,
video,
canvas {
    height: auto;
}

iframe {
    display: block;
    width: 100%;
    border: 0;
}

table {
    width: 100%;
}

input,
select,
textarea,
button {
    font: inherit;
}

textarea {
    max-width: 100%;
}

.table-responsive {
    width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
}

.table-responsive > table {
    min-width: 640px;
}

.table-responsive > table.data-table,
.table-responsive > table.results-table,
.table-responsive > table.admin-table,
.table-responsive > table.query-table {
    min-width: 760px;
}

[data-lazy-render] {
    content-visibility: auto;
    contain-intrinsic-size: 1px 720px;
}

@media (pointer: coarse) {
    button,
    .btn,
    [role="button"],
    input[type="button"],
    input[type="submit"],
    input[type="reset"],
    select,
    summary {
        min-height: 44px;
    }
}

@media (max-width: 992px) {
    .container,
    .main-container,
    .content-container,
    .content-wrapper,
    .page-container,
    .form-container,
    .modal-container,
    .modal-content,
    .result-container,
    .query-container {
        box-sizing: border-box;
        width: min(100%, 100%) !important;
        max-width: 100% !important;
    }

    .charts-grid,
    .stats-grid,
    .cards-grid,
    .grid,
    .features-grid,
    .info-grid,
    .query-grid,
    .results-grid {
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)) !important;
    }
}

/* Keep right-side panels usable on every page and at short viewport heights. */
body.ai-chat-open .qq-group-widget,
body.ai-chat-open .back-to-top,
body.ai-chat-open .social-sidebar,
body.ai-chat-open #journalPromo,
body.qq-group-open .ai-chatbot-container,
body.qq-group-open .back-to-top,
body.qq-group-open .social-sidebar,
body.qq-group-open #journalPromo {
    opacity: 0 !important;
    visibility: hidden !important;
    pointer-events: none !important;
}

.ai-chatbot-window {
    max-width: calc(100vw - 24px);
    max-height: calc(100vh - 136px);
    max-height: calc(100dvh - 136px);
}

.ai-chatbot-window .ai-chatbot-header,
.ai-chatbot-window .ai-chatbot-input {
    flex-shrink: 0;
}

.ai-chatbot-window .ai-chatbot-messages {
    min-height: 0;
    overflow-y: auto;
}

@media (max-width: 768px) {
    body {
        font-size: 15px;
    }

    .container,
    .main-container,
    .content-container,
    .content-wrapper,
    .page-container,
    .form-container,
    .modal-container,
    .modal-content,
    .card,
    .panel,
    .result-card,
    .query-box,
    .section-card {
        max-width: 100% !important;
        margin-left: auto !important;
        margin-right: auto !important;
    }

    .container,
    .main-container,
    .content-container,
    .content-wrapper,
    .page-container,
    .form-container,
    .modal-container,
    .modal-content {
        padding-left: clamp(14px, 4vw, 22px) !important;
        padding-right: clamp(14px, 4vw, 22px) !important;
    }

    header,
    nav,
    .navbar,
    .nav-container,
    .nav-links,
    .action-buttons,
    .button-group,
    .hero-actions,
    .table-controls,
    .filter-row,
    .search-row,
    .toolbar,
    .form-row,
    .form-grid,
    .team-members,
    .teacher-group,
    .template-buttons,
    .sync-buttons-group {
        flex-direction: column !important;
        align-items: stretch !important;
    }

    .charts-grid,
    .stats-grid,
    .cards-grid,
    .grid,
    .features-grid,
    .info-grid,
    .query-grid,
    .results-grid,
    .sync-buttons-group {
        grid-template-columns: 1fr !important;
    }

    .action-buttons .btn,
    .button-group .btn,
    .hero-actions .btn,
    .table-controls .btn,
    .template-buttons .btn,
    .sync-buttons-group .btn,
    .action-buttons button,
    .button-group button {
        width: 100% !important;
    }

    h1 {
        font-size: clamp(1.8rem, 6vw, 2.4rem) !important;
    }

    h2 {
        font-size: clamp(1.4rem, 5vw, 1.8rem) !important;
    }

    h3 {
        font-size: clamp(1.15rem, 4.2vw, 1.4rem) !important;
    }

    .table-responsive > table {
        min-width: 560px;
    }

    .modal-content,
    .modal-container {
        max-height: min(88vh, 900px);
        overflow-y: auto;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 14px;
    }

    .container,
    .main-container,
    .content-container,
    .content-wrapper,
    .page-container,
    .form-container,
    .modal-container,
    .modal-content {
        padding-left: 12px !important;
        padding-right: 12px !important;
    }

    .btn,
    button,
    input[type="button"],
    input[type="submit"],
    input[type="reset"] {
        min-height: 44px;
        padding-left: 14px !important;
        padding-right: 14px !important;
    }
}

/* iOS / iPadOS / 刘海屏 / 平板 */
html {
    height: 100%;
}

body {
    padding-left: max(0px, env(safe-area-inset-left));
    padding-right: max(0px, env(safe-area-inset-right));
    padding-bottom: max(0px, env(safe-area-inset-bottom));
    -webkit-tap-highlight-color: rgba(26, 58, 143, 0.12);
}

input,
select,
textarea {
    max-width: 100%;
}

@media (max-width: 1024px) {
    .hero,
    .hero-content,
    .header-container,
    .nav-container {
        max-width: 100% !important;
    }

    .nav-links,
    nav ul {
        max-width: 100%;
    }
}

@media (max-width: 768px) {
    input,
    select,
    textarea {
        font-size: 16px !important; /* 避免 iOS 聚焦自动放大 */
    }

    .modal,
    .modal-overlay,
    .login-modal,
    [class*="modal"] {
        max-width: 100vw;
    }

    .search-form,
    .query-form,
    .upload-form,
    .login-form {
        display: grid !important;
        grid-template-columns: 1fr !important;
        gap: 12px !important;
    }

    .tabs {
        flex-wrap: wrap !important;
        overflow: visible !important;
    }

    .tab {
        flex: 1 1 calc(50% - 6px) !important;
        min-width: calc(50% - 6px) !important;
        text-align: center !important;
    }

    header .logo,
    .logo {
        max-width: 100%;
    }

    .logo img {
        max-height: 48px;
        width: auto;
    }

    .logo,
    .logo-text {
        max-width: calc(100% - 52px);
        min-width: 0;
    }

    .logo-text h1,
    header .logo h1,
    .header-container h1 {
        font-size: clamp(14px, 4.2vw, 18px) !important;
        line-height: 1.25 !important;
        white-space: normal !important;
    }

    .logo-text p {
        display: none !important;
    }

    .hero-content h1 {
        font-size: clamp(1.45rem, 7vw, 2.1rem) !important;
        word-break: break-word;
    }
}

@media (min-width: 769px) and (max-width: 1199px) {
    .stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)) !important;
    }

    .container {
        padding-left: 16px !important;
        padding-right: 16px !important;
    }
}

@supports (-webkit-touch-callout: none) {
    input,
    textarea,
    select {
        border-radius: 8px;
    }
}