:root {
    --manual-primary: #B32A50;
    --manual-primary-light: #fceef2;
    --manual-primary-gradient: linear-gradient(135deg, #B32A50 0%, #d44d6e 100%);

    --manual-text: #1e1e2f;
    --manual-text-secondary: #555570;

    --manual-bg: #fafbfe;
    --manual-bg-alt: #f3f4f9;
    --manual-bg-section-alt: #faf5f7;
    --manual-white: #ffffff;
    --manual-border: #e4e7f0;

    --manual-gold: #A8894C;
    --manual-gold-gradient: linear-gradient(135deg, #faf6ee 0%, #ece2cf 100%);

    --manual-success: #1f9723;
    --manual-success-bg: #e8f8e9;
    --manual-warn: #916914;
    --manual-warn-bg: #fffac5;
    --manual-danger: #B32A50;
    --manual-danger-bg: #FFEBEE;

    --manual-blue-label: #1a3fa0;
    --manual-blue-bg: #eef3ff;

    --manual-font: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft JhengHei', sans-serif;

    --manual-radius-md: 12px;
    --manual-radius-lg: 20px;
    --manual-radius-full: 9999px;

    --manual-shadow-sm: 0 8px 8px rgba(0, 0, 0, 0.06);
    --manual-shadow-md: 0 20px 20px rgba(0, 0, 0, 0.08);
    --manual-shadow-primary: 0 16px 16px rgba(179, 42, 80, 0.2);

    --manual-ease: cubic-bezier(0.4, 0, 0.2, 1);
    --manual-transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --manual-max-w: 1200px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

#IRT-Manual {
    margin: 0;
    padding: 0;
    font-family: var(--manual-font);
    font-size: 16px;
    line-height: 1.7;
    color: var(--manual-text);
    background-color: var(--manual-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.page-header {
    background: var(--manual-white);
    color: var(--manual-text);
    text-align: center;
    padding: 1.2em 1.5em 0.8em;
    border-bottom: none;
    position: relative;
}

.page-header::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--manual-primary);
    margin: 0.6em auto 0;
    border-radius: 2px;
    opacity: 0.5;
}

.page-header h1 {
    margin: 0;
    font-size: 1.6em;
    font-weight: 900;
    letter-spacing: 0.06em;
    color: var(--manual-primary);font-family: var(--manual-font);
}

#IRT-Manual article {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0;
}

#IRT-Manual section {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

#IRT-Manual article input[type="radio"] {
    display: none;
}

#IRT-Manual article label {
    margin: 0;
    flex: 1;
    max-width: 250px;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 12px 20px;
    font-size: 1.1em;
    font-weight: 500;
    font-family: var(--manual-font);
    background: var(--manual-bg-alt);
    color: var(--manual-text-secondary);
    cursor: pointer;
    transition: all var(--manual-transition);
    border: 1px solid var(--manual-border);
    white-space: nowrap;
    position: sticky;
    top: 0;
    z-index: 2;
}

#IRT-Manual article label:first-of-type {
    border-radius: var(--manual-radius-full) 0 0 var(--manual-radius-full);
    border-right: none;
}

#IRT-Manual article label:last-of-type {
    border-radius: 0 var(--manual-radius-full) var(--manual-radius-full) 0;
    border-left: none;
}

#IRT-Manual article label:nth-of-type(2) {
    border-radius: 0;
}

#IRT-Manual article label:hover {
    color: var(--manual-primary);
    background: var(--manual-primary-light);
}

#IRT-Manual article input[type="radio"]:checked+.tab-button {
    color: #fff;
    font-size: larger;
    font-weight: 700;
    background: var(--manual-primary-gradient);
    box-shadow: var(--manual-shadow-primary);
    border-color: var(--manual-primary);
    z-index: 1;
}

#IRT-Manual article.is-stuck label {
    max-width: 100%;
}

#IRT-Manual article .tab-content {
    display: none;
    flex-direction: column;
    flex-wrap: wrap;
    animation: fadeIn 0.4s var(--manual-ease);
}

#IRT-Manual article>input:first-child:checked~.tab-content-area>.tab-content:first-child,
#IRT-Manual article>input:nth-child(3):checked~.tab-content-area>.tab-content:nth-child(2),
#IRT-Manual article>input:nth-child(5):checked~.tab-content-area>.tab-content:nth-child(3) {
    display: block;
}

.tab-content-area {
    width: 100%;
    padding-top: 30px;
}

#IRT-Manual .btn-menu {
    display: inline-flex;
    padding: 10px 22px;
    background: var(--manual-primary-gradient);
    color: #fff;
    text-decoration: none;
    border-radius: var(--manual-radius-full);
    justify-content: center;
    margin: 0.75em 6px 0;
    font-size: 0.95em;
    font-weight: 500;
    font-family: var(--manual-font);
    transition: all var(--manual-transition);
    box-shadow: var(--manual-shadow-primary);
    letter-spacing: 0.03em;
}

#IRT-Manual .btn-link {
    background: var(--manual-primary-gradient);
    color: #fff;
    text-decoration: none;
    font-size: 0.85em;
    padding: 2px 8px;
    border-radius: 12px;
}

#IRT-Manual .btn-menu:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(179, 42, 80, 0.3);
    filter: brightness(1.08);
}

#IRT-Manual .btn-menu:active {
    transform: translateY(0);
}

#IRT-Manual h2 {
    display: inline-flex;
    padding: 0.6em 2.5em;
    margin: 2em auto 0.5em;
    color: var(--manual-primary);
    background: var(--manual-primary-light);
    font-size: 1.3em;
    font-weight: 700;
    border-radius: var(--manual-radius-full);
    border: 1px solid rgba(179, 42, 80, 0.12);
    letter-spacing: 0.03em;
}

#IRT-Manual h3 {
    margin-top: 1em;
}

#IRT-Manual h3 {
    text-align: left;
    width: 100%;
    margin: 1.25em 0 0;
    color: var(--manual-text);
    font-size: 1.15em;
    font-weight: 700;
    line-height: 1.5;
    padding-left: 0.6em;
    border-left: 4px solid var(--manual-primary);
}

#IRT-Manual .chapter {
    width: 100%;
    text-align: center;
}

#IRT-Manual .tab-content-area section {
    padding: 30px 0;
}

#IRT-Manual .tab-content-area section:nth-child(odd) {
    background-color: var(--manual-bg-section-alt);
}

#IRT-Manual .flex-row {
    max-width: var(--manual-max-w);
    width: 100%;
    display: flex;
    align-self: center;
    flex-wrap: wrap;
    margin: 10px auto 20px;
    padding: 0 1.5em;
    gap: 0 30px;
}

#IRT-Manual .left,
#IRT-Manual .right {
    width: calc(50% - 15px);
    padding: 10px 0;
    box-sizing: border-box;
}

#IRT-Manual .right {
    order: 2;
}

#IRT-Manual p {
    margin: 0.3em 1em;
    line-height: 1.8;
}

#IRT-Manual ul,
#IRT-Manual ol {
    line-height: 1.8;
}

#IRT-Manual li {
    margin-bottom: 0.25em;
}

#IRT-Manual .note {
    color: var(--manual-primary);
    font-weight: bold;
}


#IRT-Manual img {
    max-width: 100%;
    height: auto;
    margin: 0.75em auto;
    display: block;
}

#IRT-Manual .grid {
    display: flex;
    width: 100%;
    max-width: 800px;
    justify-content: center;
    flex-wrap: wrap;
    margin: 0 auto;
}

#IRT-Manual .grid.grid-2 {
    display: grid;
    grid-template-columns: minmax(25%, 250px) 1fr;
    gap: 0px 0px;
    grid-auto-flow: row;
    border-radius: var(--manual-radius-md);
    overflow: hidden;
    border: 1px solid var(--manual-border);
    box-shadow: var(--manual-shadow-sm);
}

#IRT-Manual .grid div {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding: 10px;
    border: 1px solid var(--manual-border);
    margin: 0 -1px -1px 0;
    font-size: 0.95em;
    line-height: 1.6;
    flex-wrap: wrap;
}

#IRT-Manual .grid-2 div:nth-child(odd) {
    font-weight: bold;
    color: var(--manual-blue-label);
    align-items: center;
    justify-content: space-between;
    background-color: var(--manual-blue-bg);
}

#IRT-Manual .grid-2 div:nth-child(odd) img {
    height: 36px;
    margin: 0 5px;
}

#IRT-Manual .grid.grid-3 {
    display: grid;
    grid-template-columns: minmax(45%, 280px) 1fr;
    gap: 0px 0px;
    grid-auto-flow: row;
    max-width: 992px;
    padding-bottom: 0;
    border-radius: var(--manual-radius-md);
    overflow: hidden;
    border: 1px solid var(--manual-border);
    box-shadow: var(--manual-shadow-sm);
}

#IRT-Manual .grid-3 div b {
    font-weight: bold;
    color: var(--manual-text);
    align-items: center;
    justify-content: space-between;
}

#IRT-Manual .grid.grid-3:nth-child(1) {
    background-color: var(--manual-primary-light);
}

.pill {
    padding: 5px 12px;
    margin-right: 8px;
    border-radius: var(--manual-radius-full);
    line-height: 1;
    display: inline-flex;
    width: auto;
    min-width: 3rem;
    word-break: keep-all;
    justify-content: center;
    font-weight: 600;
    font-size: 0.85em;
    letter-spacing: 0.03em;
    flex-shrink: 0;
}

.best {
    background-color: var(--manual-success-bg);
    color: var(--manual-success);
}

.notice {
    background-color: var(--manual-warn-bg);
    color: var(--manual-warn);
}

.noway {
    background-color: var(--manual-danger-bg);
    color: var(--manual-danger);
}

#IRT-Manual .tips {
    background: var(--manual-gold-gradient);
    border-radius: var(--manual-radius-lg);
    padding: 1.5em 2em 2em;
    margin: 20px auto;
    width: 100%;
    max-width: 960px;
    border: 1px solid rgba(168, 137, 76, 0.15);
    box-shadow: var(--manual-shadow-sm);
    transition: box-shadow var(--manual-transition);
}

#IRT-Manual .tips:hover {
    box-shadow: var(--manual-shadow-md);
}

#IRT-Manual .alert-tips {
    background: linear-gradient(135deg, #fcfcfc 0%, #fff 100%);
    border: 2px solid rgba(179, 42, 80, 0.2);
    border-left: 6px solid var(--manual-primary);
    box-shadow: 0 4px 24px rgba(179, 42, 80, 0.12);
    position: relative;
    margin-top: 36px;
}

#IRT-Manual .alert-tips::before {
    content: "💡 特別提醒";
    position: absolute;
    top: -16px;
    left: 20px;
    background: var(--manual-primary-gradient);
    color: #fff;
    padding: 6px 16px;
    border-radius: var(--manual-radius-full);
    font-size: 0.9em;
    font-weight: 700;
    letter-spacing: 0.05em;
    box-shadow: 0 4px 12px rgba(179, 42, 80, 0.3);
    animation: pulse-glow 2s infinite;
}

#IRT-Manual .alert-tips h3 {
    color: var(--manual-primary);
    margin-top: 0.5em;
}

#IRT-Manual .alert-tips h3:after {
    border-bottom-color: var(--manual-primary);
    opacity: 0.7;
}

@keyframes pulse-glow {
    0% {
        box-shadow: 0 0 0 0 rgba(179, 42, 80, 0.5);
    }

    70% {
        box-shadow: 0 0 0 8px rgba(179, 42, 80, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(179, 42, 80, 0);
    }
}

#IRT-Manual .tips h3 {
    margin: 1em 0 0.5em;
    border-left-width: 0;
}

#IRT-Manual .tips h3:after {
    content: " ";
    display: block;
    width: 80px;
    padding-top: 12px;
    border-bottom: 3px solid var(--manual-gold);
    opacity: 0.5;
}

#IRT-Manual .tips img {
    display: block;
    margin: 1em auto;
    border-radius: var(--manual-radius-md);
    box-shadow: var(--manual-shadow-md);
    max-width: 700px;
    border: none;
}

#IRT-Manual .tips .p-item {
    margin-top: 1.5em;
    margin-bottom: 0.75em;
    font-size: 1.05em;
    text-indent: 0;
    font-weight: 500;
}

.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--manual-primary-gradient);
    color: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--manual-shadow-primary);
    transition: all var(--manual-transition);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    z-index: 100;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 28px rgba(179, 42, 80, 0.35);
}

.back-to-top svg {
    width: 22px;
    height: 22px;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media screen and (max-width: 1024px) {
    #IRT-Manual .flex-row {
        padding: 0 1.25em;
    }
}

@media screen and (max-width: 767px) {
    .page-header {
        padding: 1em 1em 0.6em;
    }

    .page-header h1 {
        font-size: 1.35em;
    }

    #IRT-Manual article {
        padding: 0.6em 0.8em;
    }

    #IRT-Manual article label {
        font-size: 0.85em;
        padding: 9px 16px;
    }


    #IRT-Manual .left,
    #IRT-Manual .right {
        width: 100%;
        order: unset;
    }

    #IRT-Manual h2 {
        font-size: 1.1em;
        padding: 0.5em 1.5em;
    }

    #IRT-Manual h3 {
        font-size: 1.05em;
    }

    #IRT-Manual .btn-menu {
        padding: 8px 14px;
        font-size: 0.85em;
        margin: 0.5em 4px 0;
    }

    #IRT-Manual .grid.grid-3:nth-child(1) {
        display: none;
    }

    #IRT-Manual .grid.grid-3 {
        grid-template-columns: 1fr;
        border-radius: var(--manual-radius-md);
    }

    #IRT-Manual .grid.grid-3 div:not(:nth-child(2n+1)) {
        border-width: 0 1px;
    }

    #IRT-Manual .grid.grid-3 div:nth-child(2n+1) {
        margin-top: 0;
        background-color: var(--manual-blue-bg);
        border-top: 1px solid var(--manual-border);
    }

    #IRT-Manual .grid.grid-2 {
        grid-template-columns: minmax(80px, 160px) 1fr;
    }

    #IRT-Manual .tips {
        padding: 1em 1.25em 1.5em;
        border-radius: var(--manual-radius-md);
    }

    #IRT-Manual .tips img {
        max-width: 100%;
    }

    .back-to-top {
        bottom: 1.5rem;
        right: 1.5rem;
        width: 44px;
        height: 44px;
    }
}

@media screen and (max-width: 480px) {
    .page-header h1 {
        font-size: 1.2em;
    }

    .page-header {
        padding: 0.8em 0.8em 0.5em;
    }

    #IRT-Manual article {
        padding: 0.5em 0.5em;
        align-items: stretch;
    }

    #IRT-Manual article label {
        padding: 10px;
        font-size: 0.9em;
        max-width: 100%;
        flex: 1;
    }

    #IRT-Manual .flex-row {
        padding: 0 1em;
        gap: 0;
    }

    #IRT-Manual .grid.grid-2 {
        grid-template-columns: 1fr;
    }

    #IRT-Manual .grid-2 div:nth-child(odd) {
        border-bottom: none;
    }
}

@media print {
    .page-header {
        background: var(--manual-white) !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }

    .back-to-top,
    .btn-menu {
        display: none !important;
    }

    #IRT-Manual article label {
        position: static;
    }
}