:root {
    --bg: #f4f4f4;
    --text: #222;
    --muted: #6b6b6b;
    --nav-bg: #1b222d;
    --nav-border: #080808;
    --nav-text: #fff;
    --panel-bg: #fff;
    --panel-border: #dedede;
    --panel-shadow: 0 8px 20px rgba(0, 0, 0, 0.04);
    --tab-border: #d9d9d9;
    --tab-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
    --input-bg: #fff;
    --input-border: #ced4da;
    --input-text: #222;
    --result-text: #5f6a75;
    --toolbar-text: #6c757d;
    --toast-bg: #333;
    --toast-text: #fff;
    --modal-title: #2b2b2b;
    --icon-hover-bg: rgba(255, 255, 255, 0.08);
}

a:focus {
  outline: revert;
  outline-offset: revert;
}

.btn.active.focus,
.btn.active:focus,
.btn.focus,
.btn:active.focus,
.btn:active:focus,
.btn:focus {
  outline: revert;
  outline-offset: revert;
}

input[type=file]:focus,
input[type=checkbox]:focus,
input[type=radio]:focus {
  outline: revert;
  outline-offset: revert;
}

body.dark {
    --bg: #10161d;
    --text: #e8edf3;
    --muted: #9ba8b5;
    --nav-bg: #0e141a;
    --nav-border: #0a0f14;
    --nav-text: #f5f7fa;
    --panel-bg: #18212b;
    --panel-border: #263342;
    --panel-shadow: 0 10px 28px rgba(0, 0, 0, 0.24);
    --tab-border: #314152;
    --tab-shadow: 0 2px 8px rgba(0, 0, 0, 0.18);
    --input-bg: #111922;
    --input-border: #314152;
    --input-text: #edf2f7;
    --result-text: #a8b3bf;
    --toolbar-text: #97a6b3;
    --toast-bg: #0a0f14;
    --toast-text: #f5f7fa;
    --modal-title: #f3f6fa;
    --icon-hover-bg: rgba(255, 255, 255, 0.06);
}

body {
    font-family: Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    scrollbar-gutter: stable;
    padding-top: 68px;
    transition: background-color 180ms ease, color 180ms ease;
}

html, body {
    height: 100%;
    margin: 0;
}

.navbar-inverse {
    background-color: var(--nav-bg);
    border-color: var(--nav-border);
}

.page-shell {
    width: min(1180px, calc(100% - 32px));
    margin-left: auto;
    margin-right: auto;
}

.nav-shell {
    display: flex;
    color: white;
    font-weight: bold;
    justify-content: space-between;
    align-items: center;
    min-height: 49px;
}

.brand-container {
    display: flex;
    align-items: center;
    gap: 2px;
    font-size: 16px;
}

.brand-title,
.brand-title:hover {
    color: var(--nav-text);
    font-weight: bold;
    text-decoration: none;
}

.flex-navbar-right {
    display: flex;
    align-items: center;
    gap: 12px;
    height: 100%;
}

.about-link-button,
.about-link-button:hover,
.about-link-button:focus {
    color: var(--nav-text);
    text-decoration: none;
    opacity: 0.95;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 49px;
}

.navbar-icon-button {
    border: none;
    background: transparent;
    color: var(--nav-text);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 49px;
    width: 36px;
    border-radius: 10px;
    padding: 0;
    transition: background-color 160ms ease, color 160ms ease;
}

.navbar-icon-button:hover,
.navbar-icon-button:focus {
    background-color: var(--icon-hover-bg);
    outline: none;
}

.theme-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
}

.theme-icon svg {
    display: block;
}

.theme-icon-light {
    display: none;
}

body.dark .theme-icon-dark {
    display: none;
}

body.dark .theme-icon-light {
    display: inline-flex;
}

.tool-page {
    padding-top: 28px;
    padding-bottom: 56px;
}

.page-intro {
    margin-bottom: 22px;
}

.page-intro h1 {
    margin: 0 0 6px;
    font-size: 35px;
    font-weight: 700;
}

.page-intro p {
    margin: 0;
    color: var(--muted);
}

.tool-tabs-container {
    margin-bottom: 18px;
}

.tool-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.tool-tab {
    min-width: 145px;
    border-radius: 10px !important;
    padding: 10px 18px;
    font-weight: 600;
    border-color: var(--tab-border);
    box-shadow: var(--tab-shadow);
}

.tool-tab.active {
    background-color: #007bff;
    color: #fff;
    border-color: #007bff;
}

.controls-container {
    margin-bottom: 18px;
}

.tool-panel {
    display: none;
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    padding: 16px;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-start;
    box-shadow: var(--panel-shadow);
}

.tool-panel.active {
    display: flex;
}

.tool-action,
.panel-button {
    min-height: 42px;
    border-radius: 10px;
}

.find-panel {
    justify-content: flex-start;
}

.panel-input {
    max-width: 300px;
    min-height: 42px;
    border-radius: 10px;
}

.tool-action,
.panel-button,
#copyResultsButton,
#copyButton,
.panel-input,
#inputText,
#resultText,
.modal-content,
.modal-header,
.modal-footer {
    transition: background-color 180ms ease, border-color 180ms ease, color 180ms ease;
}

body.dark .btn-light,
body.dark .btn-outline-secondary,
body.dark .btn-default,
body.dark .btn-secondary {
    background-color: #111922;
    border-color: #314152;
    color: #edf2f7;
}

body.dark .btn-light:hover,
body.dark .btn-outline-secondary:hover,
body.dark .btn-default:hover,
body.dark .btn-secondary:hover,
body.dark .btn-light:focus,
body.dark .btn-outline-secondary:focus,
body.dark .btn-default:focus,
body.dark .btn-secondary:focus {
    background-color: #1d2834;
    border-color: #3b4d60;
    color: #fff;
}

body.dark .btn-primary {
    background-color: #2d7ff9;
    border-color: #2d7ff9;
}

body.dark .form-control {
    background-color: var(--input-bg);
    border-color: var(--input-border);
    color: var(--input-text);
}

body.dark .form-control::placeholder {
    color: #7f90a1;
}

body.dark input[type="checkbox"] {
    accent-color: #2d7ff9;
}

.regex-toggle {
    margin: 0;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 42px;
    line-height: 1;
    padding: 0 4px;
}

.regex-toggle input[type="checkbox"] {
    margin: 0;
    position: relative;
    top: -1px;
}

.result-panel {
    margin-bottom: 18px;
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    padding: 16px;
    box-shadow: var(--panel-shadow);
}

.result-panel[hidden] {
    display: none !important;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-bottom: 10px;
}

.result-count {
    margin: 0;
    color: var(--result-text);
    font-weight: bold;
}

#resultText {
    min-height: 170px;
    resize: vertical;
    border-radius: 10px;
}

.editor-container {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 10px;
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    padding: 16px;
    height: calc(100vh - 290px);
    height: calc(100dvh - 290px);
    min-height: 420px;
    box-shadow: var(--panel-shadow);
}

.editor-container textarea {
    width: 100%;
    height: 100%;
    resize: none;
    border-radius: 10px;
}

#inputText {
    padding-bottom: 54px;
    padding-top: 12px;
}

.editor-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    color: var(--toolbar-text);
    font-size: 0.92rem;
}

.status-text {
    min-height: 20px;
}

#copyButton {
    position: absolute;
    right: 28px;
    bottom: 62px;
    font-size: 0.7em;
    font-weight: bold;
    border-radius: 9px;
}

.toast {
    background-color: var(--toast-bg);
    color: var(--toast-text);
    padding: 10px;
    border-radius: 5px;
    opacity: 0.9;
    display: none;
    position: fixed;
    bottom: 12px;
    right: 20px;
    z-index: 1000;
}

.modal-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
}

.custom-modal-title {
    margin: 0;
    font-size: 20px;
    font-weight: 700;
    line-height: 1.1;
    color: var(--modal-title);
}

.modal-header .close {
    margin: 0;
    padding: 0;
    line-height: 1;
    font-size: 25px;
    font-weight: 600;
    opacity: 0.35;
}

body.dark .modal-content {
    background-color: #18212b;
    color: #e8edf3;
    border: 1px solid #263342;
}

body.dark .modal-header,
body.dark .modal-footer {
    border-color: #263342;
}

body.dark .modal-header .close {
    color: #f3f6fa;
    text-shadow: none;
    opacity: 0.55;
}

body.dark .about-author-link,
body.dark .modal-body a {
    color: #7fb3ff;
}

@media (max-width: 992px) {
    body {
        padding-top: 76px;
    }

    .find-panel {
        justify-content: center;
    }

    .panel-input {
        max-width: none;
        width: 100%;
    }

    .tool-tab {
        min-width: 130px;
    }
}

@media (max-width: 768px) {
    .page-shell {
        width: calc(100% - 24px);
    }

    .nav-shell {
        min-height: 49px;
    }

    .page-intro h1 {
        font-size: 26px;
    }

    .tool-tab {
        min-width: 110px;
        flex: 1 1 calc(50% - 6px);
    }

    .editor-container {
        height: calc(100vh - 400px);
        height: calc(100dvh - 400px);
    }

    .editor-toolbar,
    .result-header {
        flex-direction: column;
        align-items: flex-start;
    }

    #copyButton {
        right: 24px;
        bottom: 78px;
    }
}