:root {
    --primary: #5b4be7;
    --primary-dark: #4434c8;
    --primary-soft: #eeecff;
    --accent: #18a999;
    --ink: #17182f;
    --muted: #676b80;
    --surface: #f7f8fc;
    --surface-raised: #ffffff;
    --border: #e5e7f0;
    --shadow-sm: 0 8px 24px rgba(31, 27, 76, .07);
    --shadow-lg: 0 22px 60px rgba(31, 27, 76, .13);
}

html {
    scroll-behavior: smooth;
}

body {
    color: var(--ink);
    background: #fdfdff;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 1030;
    border-bottom: 1px solid rgba(229, 231, 240, .85);
    background: rgba(255, 255, 255, .82);
    box-shadow: 0 1px 0 rgba(255, 255, 255, .7);
    backdrop-filter: blur(18px);
}

.navbar {
    min-height: 76px;
}

.brand-mark {
    display: inline-grid;
    width: 38px;
    height: 38px;
    place-items: center;
    border-radius: 11px;
    color: var(--primary);
    background: var(--primary-soft);
    font-size: .9rem;
}

.nav-link {
    color: #4f5266;
    font-weight: 500;
}

.nav-link:hover {
    color: var(--primary);
}

.language-button {
    border: 1px solid var(--border);
    border-radius: .7rem;
    color: var(--ink);
    background: #fff;
}

.header-search {
    width: min(330px, 100%);
}

.header-search .form-control {
    border-right: 0;
    border-radius: .72rem 0 0 .72rem;
    background: #f8f8fc;
}

.header-search .btn {
    border-radius: 0 .72rem .72rem 0;
}

.dropdown-menu {
    padding: .5rem;
    border: 1px solid var(--border);
    border-radius: .85rem;
    box-shadow: var(--shadow-lg);
}

.dropdown-item {
    border-radius: .55rem;
}

.hero-section {
    overflow: hidden;
    background:
        radial-gradient(circle at 15% 20%, rgba(91, 75, 219, .12), transparent 28%),
        radial-gradient(circle at 85% 0%, rgba(29, 181, 165, .10), transparent 25%),
        linear-gradient(180deg, #fbfbff 0%, #fff 100%);
}

.py-lg-6 {
    padding-top: 6rem !important;
    padding-bottom: 6rem !important;
}

.hero-copy {
    max-width: 720px;
}

.eyebrow {
    color: var(--primary);
    font-size: .78rem;
    font-weight: 700;
    letter-spacing: .09em;
    text-transform: uppercase;
}

.btn-primary {
    --bs-btn-bg: var(--primary);
    --bs-btn-border-color: var(--primary);
    --bs-btn-hover-bg: var(--primary-dark);
    --bs-btn-hover-border-color: var(--primary-dark);
    --bs-btn-active-bg: var(--primary-dark);
    --bs-btn-active-border-color: var(--primary-dark);
}

.btn {
    border-radius: .72rem;
    font-weight: 600;
}

.tool-card {
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 1.15rem;
    background: var(--surface-raised);
    transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

.tool-card::after {
    position: absolute;
    inset: 0 auto 0 0;
    width: 3px;
    background: linear-gradient(180deg, var(--primary), var(--accent));
    content: "";
    opacity: 0;
    transition: opacity .2s ease;
}

.tool-card:hover {
    transform: translateY(-5px);
    border-color: rgba(91, 75, 219, .35);
    box-shadow: var(--shadow-lg);
}

.tool-card:hover::after {
    opacity: 1;
}

.tool-card .card-body {
    display: flex;
    flex-direction: column;
}

.tool-card .text-secondary {
    color: var(--muted) !important;
    line-height: 1.65;
}

.tool-icon {
    display: grid;
    width: 46px;
    height: 46px;
    place-items: center;
    border: 1px solid rgba(91, 75, 231, .1);
    border-radius: .9rem;
    color: var(--primary);
    background: rgba(91, 75, 219, .10);
    font-weight: 800;
}

.tool-card-link {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    color: var(--primary);
    font-size: .88rem;
    font-weight: 700;
}

.tool-category {
    padding: .48rem .72rem;
    border: 1px solid rgba(91, 75, 231, .12);
    border-radius: 999px;
    color: var(--primary);
    background: rgba(91, 75, 219, .10);
}

.category-filter {
    position: sticky;
    top: 92px;
    z-index: 10;
    padding: .8rem;
    border: 1px solid var(--border);
    border-radius: 1.1rem;
    background: rgba(255, 255, 255, .9);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(16px);
}

.category-filter-button {
    border-radius: .7rem;
    transition: color .2s ease, background-color .2s ease, border-color .2s ease;
}

.category-filter-button .badge {
    color: var(--ink) !important;
}

.privacy-banner {
    border-radius: 1.25rem;
    background: linear-gradient(135deg, #24204c, #5545cb);
}

.privacy-icon {
    display: inline-grid;
    width: 72px;
    height: 72px;
    place-items: center;
    border: 1px solid rgba(255, 255, 255, .25);
    border-radius: 50%;
    color: #fff;
    background: rgba(255, 255, 255, .10);
    font-size: 2rem;
}

.page-header {
    overflow: hidden;
    border-bottom: 1px solid var(--border);
    background:
        radial-gradient(circle at 80% 10%, rgba(24, 169, 153, .12), transparent 24%),
        radial-gradient(circle at 8% 20%, rgba(91, 75, 231, .15), transparent 28%),
        linear-gradient(180deg, #fbfbff, #f6f7fc);
}

.page-header-content {
    max-width: 760px;
}

.category-heading-mark {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    box-shadow: 0 0 0 6px var(--primary-soft);
}

.category-count {
    display: inline-grid;
    min-width: 29px;
    height: 29px;
    place-items: center;
    border-radius: 999px;
    color: var(--muted);
    background: var(--surface);
    font-size: .8rem;
    font-weight: 700;
}

.breadcrumb a {
    color: var(--primary);
    text-decoration: none;
}

.tool-workspace {
    max-width: 1180px;
    margin-inline: auto;
    border: 1px solid rgba(229, 231, 240, .9);
    border-radius: 1.4rem;
    background: #fff;
    box-shadow: var(--shadow-lg);
}

.workspace-pane {
    display: flex;
    min-height: 470px;
    flex-direction: column;
    padding: 1.3rem;
    border: 1px solid var(--border);
    border-radius: 1.05rem;
    background: #fbfbfe;
}

.output-pane {
    background: linear-gradient(180deg, #fafaff, #f6f7fb);
}

.pane-heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
}

.pane-heading label {
    display: block;
    color: var(--ink);
    font-size: 1rem;
}

.pane-kicker {
    display: block;
    margin-bottom: .22rem;
    color: var(--primary);
    font-size: .68rem;
    font-weight: 800;
    letter-spacing: .1em;
    text-transform: uppercase;
}

.pane-number {
    color: #b3b5c5;
    font-size: .75rem;
    font-weight: 800;
    letter-spacing: .08em;
}

.code-area {
    min-height: 310px;
    flex: 1;
    border-color: var(--border);
    border-radius: .9rem;
    font-family: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
    font-size: .92rem;
    line-height: 1.6;
    resize: vertical;
}

.number-input-wrap {
    display: grid;
    min-height: 230px;
    place-items: center;
    border: 1px dashed #d9d9e8;
    border-radius: .9rem;
    background:
        radial-gradient(circle at center, rgba(91, 75, 231, .08), transparent 55%),
        #fff;
}

.number-input {
    width: min(260px, 82%);
    min-height: 76px;
    border: 2px solid rgba(91, 75, 231, .25);
    border-radius: 1rem;
    color: var(--ink);
    background: #fff;
    font-size: 2rem;
    font-weight: 800;
    text-align: center;
}

.number-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 .3rem rgba(91, 75, 231, .12);
}

.input-guidance {
    display: flex;
    align-items: flex-start;
    gap: .7rem;
    margin-top: 1rem;
    padding: .85rem 1rem;
    border-radius: .8rem;
    color: #55596f;
    background: var(--primary-soft);
    font-size: .84rem;
    line-height: 1.55;
}

.guidance-icon {
    display: inline-grid;
    width: 22px;
    height: 22px;
    flex: 0 0 22px;
    place-items: center;
    border-radius: 50%;
    color: #fff;
    background: var(--primary);
    font-size: .72rem;
    font-weight: 800;
}

.privacy-note {
    margin-top: .75rem;
}

.code-area:focus {
    border-color: rgba(91, 75, 219, .65);
    box-shadow: 0 0 0 .25rem rgba(91, 75, 219, .12);
}

.output-area {
    background: #f8f9fd;
}

.tool-options {
    padding: 1.15rem;
    border: 1px solid var(--border);
    border-radius: .95rem;
    background: linear-gradient(180deg, #fafaff, #f5f6fb);
}

.tool-actions {
    padding-block: .2rem;
}

.tool-actions .btn-primary {
    min-width: 125px;
    box-shadow: 0 8px 20px rgba(91, 75, 231, .22);
}

.visual-output {
    overflow: auto;
    padding: 1.25rem;
    border: 1px solid var(--border);
    border-radius: .8rem;
    background: #fff;
}

.visual-output img,
.visual-output canvas {
    max-width: 100%;
    height: auto;
}

.qr-output {
    display: grid;
    min-height: 260px;
    place-items: center;
}

.color-preview {
    min-height: 120px;
    border: 1px solid rgba(0, 0, 0, .12);
    border-radius: .75rem;
}

.markdown-preview {
    line-height: 1.7;
}

.markdown-preview pre {
    overflow-x: auto;
    padding: 1rem;
    border-radius: .65rem;
    background: #17182f;
    color: #f8f9fc;
}

.diff-line {
    display: block;
    padding: .2rem .5rem;
    white-space: pre-wrap;
    font-family: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
}

.diff-added {
    background: #e7f8ed;
    color: #176b36;
}

.diff-removed {
    background: #fdecec;
    color: #9f2525;
}

.diff-same {
    color: #65687a;
}

.seo-content {
    max-width: 820px;
    margin-inline: auto;
    padding: 2rem;
    border: 1px solid var(--border);
    border-radius: 1.15rem;
    color: #50536a;
    background: #fff;
    box-shadow: var(--shadow-sm);
    line-height: 1.8;
}

.content-section {
    max-width: 980px;
    margin-inline: auto;
    padding: 2rem;
    border: 1px solid var(--border);
    border-radius: 1.15rem;
    background: #fff;
    box-shadow: var(--shadow-sm);
}

.how-to-list {
    display: grid;
    gap: 1rem;
    padding-left: 1.4rem;
    color: #50536a;
    line-height: 1.7;
}

.how-to-list li::marker {
    color: var(--primary);
    font-weight: 800;
}

.faq-accordion .accordion-item {
    border-color: var(--border);
}

.faq-accordion .accordion-button {
    color: var(--ink);
    font-weight: 700;
}

.faq-accordion .accordion-button:not(.collapsed) {
    color: var(--primary);
    background: var(--primary-soft);
    box-shadow: none;
}

.search-result-summary {
    padding: 1rem 1.2rem;
    border: 1px solid var(--border);
    border-radius: .9rem;
    color: var(--muted);
    background: #fff;
    box-shadow: var(--shadow-sm);
    font-weight: 600;
}

.seo-content h2 {
    color: var(--ink);
}

.empty-state {
    max-width: 520px;
}

.site-footer {
    border-top: 1px solid var(--border);
    background: linear-gradient(180deg, #fafaff, #f5f6fb);
}

@media (max-width: 767.98px) {
    .display-4 {
        font-size: 2.4rem;
    }

    .py-lg-6 {
        padding-top: 4rem !important;
        padding-bottom: 4rem !important;
    }

    .category-filter {
        position: static;
        flex-wrap: nowrap !important;
        overflow-x: auto;
        scrollbar-width: none;
    }

    .category-filter::-webkit-scrollbar {
        display: none;
    }

    .category-filter-button {
        flex: 0 0 auto;
    }

    .tool-workspace .card-body {
        padding: 1.25rem !important;
    }

    .workspace-pane {
        min-height: auto;
        padding: 1rem;
    }

    .code-area {
        min-height: 250px;
    }

    .number-input-wrap {
        min-height: 180px;
    }
}