:root {
    --page-bg: #f2f6f8;
    --ink: #172033;
    --muted: #607089;
    --line: #d9e7ee;
    --cyan: #14b8cf;
    --green: #55bd70;
    --blue: #4361ee;
    --rose: #cf5576;
    --panel: #ffffff;
    --soft-panel: #fbfdfe;
    --shadow: 0 12px 28px rgba(31, 78, 97, 0.09);
    --hover-shadow: 0 14px 28px rgba(31, 78, 97, 0.16);
    --transition: all 0.2s ease;
}

* {
    box-sizing: border-box;
}

body {
    background: var(--page-bg);
    color: var(--ink);
    font-family: "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
    line-height: 1.6;
}

a {
    color: var(--cyan);
}

a:hover {
    color: #109bad;
}

.container {
    max-width: 1120px;
    padding-top: 24px;
    padding-bottom: 34px;
}

.tool-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(242, 246, 248, 0.92);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 8px 22px rgba(31, 78, 97, 0.07);
    backdrop-filter: blur(12px);
}

.tool-nav__inner {
    width: min(1180px, calc(100% - 28px));
    margin: 0 auto;
    min-height: 74px;
    display: flex;
    align-items: center;
    gap: 14px;
}

.tool-nav__brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-width: max-content;
    color: var(--ink);
    font-size: 18px;
    font-weight: 900;
    text-decoration: none;
}

.tool-nav__brand .site-icon {
    width: 32px;
    height: 32px;
    flex: 0 0 32px;
    border-radius: 6px;
    object-fit: cover;
}

.tool-nav__brand:hover {
    color: var(--ink);
    text-decoration: none;
}

.tool-nav__links {
    display: flex;
    align-items: center;
    gap: 7px;
    flex: 1 1 auto;
    min-width: 0;
    overflow-x: auto;
    padding: 10px 2px;
    scrollbar-width: thin;
}

.tool-nav__links::-webkit-scrollbar {
    height: 6px;
}

.tool-nav__links::-webkit-scrollbar-thumb {
    background: #c8dce5;
    border-radius: 999px;
}

.tool-nav__link {
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    flex: 1 1 122px;
    min-width: 112px;
    max-width: 154px;
    min-height: 56px;
    padding: 8px 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
    color: var(--ink);
    text-decoration: none;
    line-height: 1.18;
    white-space: normal;
    overflow: hidden;
    box-shadow: 0 5px 16px rgba(31, 78, 97, 0.05);
    transition: var(--transition);
}

.tool-nav__link:hover {
    color: var(--ink);
    border-color: #bfe8f2;
    transform: translateY(-1px);
    text-decoration: none;
}

.tool-nav__link.active {
    background: var(--cyan);
    border-color: var(--cyan);
    color: #fff;
    box-shadow: 0 10px 20px rgba(20, 184, 207, 0.18);
}

.tool-nav__group {
    margin-bottom: 3px;
    color: inherit;
    opacity: 0.72;
    font-size: 10px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 100%;
}

.tool-nav__label {
    display: -webkit-box;
    overflow: hidden;
    max-width: 100%;
    color: inherit;
    font-size: 13px;
    font-weight: 800;
    line-height: 1.2;
    text-align: left;
    overflow-wrap: anywhere;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
}

.converter-box,
.intro-section,
.result-card,
.output-card,
.main .content {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.converter-box {
    position: relative;
    overflow: hidden;
    max-width: 1000px;
    margin: 2rem auto;
    padding: 2rem;
}

.converter-box::before {
    content: "";
    display: block;
    height: 8px;
    margin: -2rem -2rem 1.5rem;
    background: linear-gradient(90deg, var(--blue), var(--cyan), var(--green));
}

.converter-box h2,
.converter-box h4,
.intro-section h2,
.intro-section h3,
.intro-section h4,
.main .content h2,
.main .content h3 {
    color: var(--ink);
    font-weight: 800;
    letter-spacing: 0;
}

.converter-box h2,
.converter-box h4 {
    margin-bottom: 1.35rem;
    border-bottom: 2px solid var(--cyan) !important;
    padding-bottom: 14px;
    text-align: center;
}

.intro-section {
    color: #43536c;
    padding: 1.6rem;
}

.intro-section p,
.intro-section li {
    color: #43536c;
}

.intro-section ul,
.intro-section ol {
    padding-left: 1.25rem;
}

label,
.input-group label {
    color: var(--ink);
    font-weight: 700;
}

.form-control,
.form-select,
textarea,
input[type="text"],
input[type="number"],
select {
    background: var(--soft-panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    color: var(--ink);
    transition: var(--transition);
}

.form-control:focus,
.form-select:focus,
textarea:focus,
input[type="text"]:focus,
input[type="number"]:focus,
select:focus {
    background: #fff;
    border-color: var(--cyan);
    box-shadow: 0 0 0 3px rgba(20, 184, 207, 0.16);
    color: var(--ink);
}

textarea.form-control {
    background: var(--soft-panel) !important;
    border-color: var(--line) !important;
    min-height: 132px;
}

.btn,
button,
input[type="button"],
.convert-btn,
.mode-btn {
    border-radius: 6px;
    font-weight: 800;
    letter-spacing: 0;
    transition: var(--transition);
}

.btn-primary,
button.btn-primary,
.convert-btn,
input[type="button"] {
    background: var(--cyan);
    border-color: var(--cyan);
    color: #fff;
    box-shadow: 0 10px 20px rgba(20, 184, 207, 0.16);
}

.btn-primary:hover,
button.btn-primary:hover,
.convert-btn:hover,
input[type="button"]:hover {
    background: #109bad;
    border-color: #109bad;
    color: #fff;
    transform: translateY(-1px);
}

.btn-secondary,
.btn-outline-secondary {
    background: #fff;
    border-color: var(--line);
    color: var(--muted);
}

.btn-secondary:hover,
.btn-outline-secondary:hover {
    background: #eef8fb;
    border-color: #bfe8f2;
    color: var(--ink);
}

.mode-switch {
    display: inline-flex;
    gap: 6px;
    padding: 4px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--soft-panel);
}

.mode-btn {
    background: transparent;
    border: none;
    color: var(--muted);
    padding: 8px 12px;
}

.mode-btn.active,
.mode-btn:hover {
    background: var(--cyan);
    color: #fff;
}

.result-card,
.output-card {
    background: var(--soft-panel);
    padding: 1.25rem;
    min-height: 58px;
}

.result-card:hover,
.output-card:hover {
    box-shadow: var(--hover-shadow);
    transform: translateY(-2px);
}

.conversion-value,
.result-value,
#result,
#a_mo2,
#a_mo3 {
    color: var(--blue);
    font-weight: 800;
}

.gap-3 {
    gap: 1rem;
}

.gap-4 {
    gap: 1.5rem;
}

.tool-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    margin: 1rem 0 1.25rem;
}

.tool-actions .btn,
.tool-actions button {
    width: auto;
    min-width: 118px;
    margin: 0;
}

.tool-status {
    min-height: 24px;
    margin-left: auto;
    color: var(--muted);
    font-size: 13px;
    font-weight: 700;
}

.tool-language-switch {
    display: flex;
    justify-content: flex-end;
    gap: 4px;
    margin: 0 auto 16px;
}

.tool-language-btn {
    min-width: 42px;
    border: 1px solid var(--line);
    border-radius: 4px;
    background: #fff;
    color: var(--muted);
    padding: 6px 10px;
    font-size: 13px;
    font-weight: 900;
    cursor: pointer;
}

.tool-language-btn.active {
    background: #e9f4ff;
    border-color: #98ccff;
    color: #1689ed;
}

.set-operations-panel {
    max-width: 1080px;
}

.set-controls,
.set-input-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

.set-field {
    min-width: 0;
    margin-bottom: 1.35rem;
}

.set-field .form-label {
    min-height: 22px;
    margin-bottom: 8px;
    color: var(--ink);
    font-weight: 800;
}

.set-field .form-select,
.set-field .form-control {
    width: 100%;
}

.set-field .form-select {
    height: 48px;
    padding: 0 42px 0 14px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    line-height: 48px;
}

.set-field-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    min-height: 30px;
    margin-bottom: 8px;
}

.set-field-header .form-label {
    margin-bottom: 0;
}

.set-count {
    flex: 0 0 auto;
    color: var(--muted);
    font-size: 13px;
    font-weight: 800;
}

.set-count strong {
    color: var(--blue);
}

.set-textarea-field {
    display: flex;
    flex-direction: column;
}

.set-textarea-field textarea.form-control {
    min-height: 190px;
    resize: vertical;
}

.set-action-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 0.2rem 0 1.35rem;
}

.set-action-bar #calculateBtn {
    flex: 0 0 190px;
    height: 44px;
    margin: 0;
}

.set-secondary-actions {
    flex: 1 1 auto;
    margin: 0;
}

.set-secondary-actions .btn {
    min-width: 112px;
}

.set-result-card {
    margin-top: 0;
    min-height: 118px;
}

.set-result-card h5 {
    margin-bottom: 12px;
    color: var(--ink);
    font-size: 17px;
    font-weight: 900;
}

#operationResult {
    min-height: 32px;
    color: #43536c;
    line-height: 1.7;
    word-break: break-word;
}

.result-card.is-empty,
.output-card:empty {
    color: var(--muted);
}

.copyable-value {
    cursor: pointer;
}

.copyable-value:hover {
    color: var(--cyan);
}

.alert,
.notice,
.tips {
    border-radius: 8px;
    border-color: var(--line);
}

/* RGB converter keeps an older table structure, so these rules align it with the newer pages. */
.head {
    display: none;
    background: #fff;
    border-bottom: 1px solid var(--line);
    color: var(--ink);
    box-shadow: 0 8px 22px rgba(31, 78, 97, 0.06);
}

.head b {
    font-weight: 800;
    background: linear-gradient(90deg, var(--blue), var(--cyan), var(--green));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.main {
    max-width: 980px;
    padding: 18px;
}

.main .path {
    color: var(--muted);
}

.main .path a {
    color: var(--cyan);
}

.main .path a:hover {
    border-bottom-color: var(--cyan);
}

.main .content {
    position: relative;
    padding: 2rem;
    overflow: hidden;
    border-top: 8px solid var(--cyan);
}

.main .content .area {
    max-width: none;
    color: #43536c;
}

.main table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
}

.main table td {
    padding: 8px;
    vertical-align: middle;
}

.main table table {
    border: 1px solid var(--line);
    border-radius: 8px;
    overflow: hidden;
    background: var(--soft-panel);
}

.foot {
    color: var(--muted);
}

@media (max-width: 768px) {
    .tool-nav__inner {
        width: calc(100% - 20px);
        min-height: auto;
        flex-direction: column;
        align-items: stretch;
        gap: 6px;
        padding: 10px 0;
    }

    .tool-nav__brand {
        justify-content: center;
    }

    .tool-nav__link {
        flex: 0 0 126px;
        min-width: 126px;
        max-width: 126px;
    }

    .container {
        padding-left: 14px;
        padding-right: 14px;
    }

    .converter-box,
    .intro-section,
    .main .content {
        padding: 1.25rem;
    }

    .converter-box::before {
        margin: -1.25rem -1.25rem 1.2rem;
    }

    .main {
        padding: 12px;
    }

    .tool-actions {
        align-items: stretch;
    }

    .tool-actions .btn,
    .tool-actions button {
        flex: 1 1 140px;
    }

    .tool-status {
        flex-basis: 100%;
        margin-left: 0;
    }

    .set-controls,
    .set-input-grid {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .set-field-header {
        align-items: flex-start;
        flex-direction: column;
        gap: 4px;
    }

    .set-action-bar {
        align-items: stretch;
        flex-direction: column;
    }

    .set-action-bar #calculateBtn {
        flex: 0 0 auto;
        width: 100%;
    }

    .set-secondary-actions {
        width: 100%;
    }
}