:root {
    --bg: #f5fbfd;
    --surface: #ffffff;
    --surface-muted: #eefbfb;
    --border: #d7e8ee;
    --text: #0f172a;
    --text-soft: #334155;
    --text-muted: #64748b;
    --primary: #0ea5a4;
    --primary-strong: #0f766e;
    --primary-soft: #defcf8;
    --success-bg: #ecfdf3;
    --success-text: #047857;
    --error-bg: #fff1f2;
    --error-text: #be123c;
    --shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
    --radius: 20px;
    --radius-sm: 14px;
    --container: 1180px;
}

body[data-theme="dark"] {
    --bg: #081019;
    --surface: #0b1220;
    --surface-muted: #102033;
    --border: #1d3148;
    --text: #e5f3fb;
    --text-soft: #bfd6e5;
    --text-muted: #84a4bf;
    --primary: #22d3ee;
    --primary-strong: #06b6d4;
    --primary-soft: #0e2433;
    --success-bg: #0f2f23;
    --success-text: #86efac;
    --error-bg: #3a1018;
    --error-text: #fda4af;
    --shadow: 0 18px 40px rgba(2, 6, 23, 0.45);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font: 16px/1.65 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--text);
    background: linear-gradient(180deg, var(--bg), var(--bg));
}

img {
    max-width: 100%;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

code,
pre,
textarea,
input,
select {
    font: inherit;
}

.site-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.site-main {
    flex: 1;
}

.container {
    width: min(100% - 32px, var(--container));
    margin: 0 auto;
}

.narrow {
    width: min(100% - 32px, 760px);
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: color-mix(in srgb, var(--surface) 80%, transparent);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    min-height: 80px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 14px;
    min-width: 0;
}

.brand img {
    width: 56px;
    height: auto;
}

.brand strong {
    display: block;
    font-size: 1.05rem;
    letter-spacing: -0.02em;
}

.brand span {
    display: block;
    color: var(--text-muted);
    font-size: 0.95rem;
    max-width: 520px;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.site-nav a,
.theme-toggle,
.nav-toggle {
    border: 0;
    background: transparent;
    color: var(--text-soft);
    font-weight: 600;
    cursor: pointer;
}

.site-nav a,
.theme-toggle {
    padding: 10px 14px;
    border-radius: 999px;
    transition: background 0.2s ease, color 0.2s ease;
}

.site-nav a:hover,
.site-nav a.active,
.theme-toggle:hover {
    background: var(--surface-muted);
    color: var(--text);
}

.nav-toggle {
    display: none;
    width: 44px;
    height: 44px;
    padding: 10px;
    border-radius: 12px;
    border: 1px solid var(--border);
}

.nav-toggle span {
    display: block;
    height: 2px;
    width: 100%;
    background: var(--text);
    margin: 5px 0;
}

.hero-section,
.page-hero {
    padding: 64px 0 24px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 32px;
    align-items: center;
}

.hero-copy h1,
.page-hero h1 {
    margin: 0 0 14px;
    font-size: clamp(2.2rem, 5vw, 4rem);
    line-height: 1.05;
    letter-spacing: -0.045em;
}

.hero-copy p,
.page-hero p {
    margin: 0;
    color: var(--text-soft);
    font-size: 1.06rem;
}

.eyebrow {
    display: inline-flex;
    margin-bottom: 14px;
    padding: 7px 12px;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--primary);
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.hero-actions,
.center-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 24px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 48px;
    padding: 0 18px;
    border: 1px solid transparent;
    border-radius: 14px;
    font-weight: 700;
    transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.button:hover {
    transform: translateY(-1px);
}

.button-primary {
    background: var(--primary);
    color: #fff;
}

.button-primary:hover {
    background: var(--primary-strong);
}

.button-secondary {
    background: var(--surface);
    border-color: var(--border);
    color: var(--text);
}

.button-ghost {
    background: transparent;
    border-color: var(--border);
    color: var(--text);
}

.button-small {
    min-height: 40px;
    padding: 0 14px;
    border-radius: 12px;
}

.hero-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 28px;
}

.stat-card {
    min-width: 150px;
    padding: 16px 18px;
    border: 1px solid var(--border);
    background: var(--surface);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow);
}

.stat-card strong {
    display: block;
    margin-bottom: 4px;
    font-size: 1.25rem;
    letter-spacing: -0.04em;
}

.stat-card span {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.hero-panel {
    display: grid;
    gap: 18px;
}

.panel-card,
.tool-panel,
.card,
.list-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.panel-card {
    padding: 24px;
}

.panel-featured {
    background:
        radial-gradient(circle at top right, color-mix(in srgb, var(--primary) 16%, transparent), transparent 36%),
        var(--surface);
}

.panel-card small,
.tool-panel small {
    display: inline-block;
    margin-bottom: 10px;
    color: var(--text-muted);
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.panel-card h2,
.tool-panel h2,
.section-head h2,
.page-hero h1,
.card h2,
.card h3 {
    letter-spacing: -0.03em;
}

.panel-card h2,
.tool-panel h2,
.card h2,
.card h3 {
    margin: 0 0 12px;
    font-size: 1.34rem;
}

.panel-card p,
.card p,
.list-card p,
.section-copy {
    color: var(--text-soft);
}

.inline-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.92rem;
}

.inline-meta span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    border-radius: 999px;
    background: var(--surface-muted);
}

.center-meta {
    justify-content: center;
    margin-bottom: 18px;
}

.compact-list,
.feature-list {
    padding-left: 18px;
    margin: 0;
    color: var(--text-soft);
}

.compact-list li,
.feature-list li {
    margin: 10px 0;
}

.section {
    padding: 28px 0 60px;
}

.section-muted {
    background: color-mix(in srgb, var(--surface) 20%, transparent);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.section-head {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 24px;
}

.section-head h2 {
    margin: 8px 0 0;
    font-size: clamp(1.7rem, 3vw, 2.4rem);
}

.cards-grid {
    display: grid;
    gap: 20px;
}

.tools-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.article-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
}

.card {
    overflow: hidden;
}

.card-content {
    padding: 22px;
}

.card h2,
.card h3 {
    font-size: 1.16rem;
}

.card h2 a:hover,
.card h3 a:hover,
.list-card h3 a:hover,
.text-link:hover,
.mini-list a:hover strong {
    color: var(--primary);
}

.card-tool {
    display: grid;
    grid-template-columns: 92px 1fr;
}

.tool-icon {
    display: grid;
    place-items: center;
    padding: 22px;
    border-right: 1px solid var(--border);
    background:
        linear-gradient(180deg, color-mix(in srgb, var(--primary) 16%, transparent), transparent),
        var(--surface-muted);
    font-weight: 900;
    font-size: 1.2rem;
    color: var(--primary);
    letter-spacing: -0.03em;
}

.chip {
    display: inline-flex;
    padding: 6px 10px;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--primary);
    font-size: 0.8rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.keyword-row,
.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.keyword-row span {
    display: inline-flex;
    padding: 7px 10px;
    border-radius: 999px;
    background: var(--surface-muted);
    color: var(--text-muted);
    font-size: 0.84rem;
}

.text-link {
    display: inline-flex;
    margin-top: 14px;
    color: var(--primary);
    font-weight: 700;
}

.split-grid,
.tool-layout,
.article-layout {
    display: grid;
    gap: 24px;
}

.split-grid {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: start;
}

.tool-layout {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: start;
}

.article-layout {
    grid-template-columns: 1fr 320px;
    align-items: start;
}

.article-list {
    display: grid;
    gap: 16px;
    margin-top: 28px;
}

.list-card {
    padding: 20px;
}

.list-card h3 {
    margin: 10px 0;
    font-size: 1.12rem;
}

.ad-slot {
    min-height: 180px;
    display: grid;
    place-items: center;
    text-align: center;
    gap: 8px;
    padding: 24px;
    border: 1px dashed var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--text-muted);
    box-shadow: var(--shadow);
}

.ad-slot span {
    font-weight: 700;
    color: var(--text-soft);
}

.mt-24 {
    margin-top: 24px;
}

.toolbar {
    display: grid;
    gap: 16px;
    margin-bottom: 22px;
}

.search-input,
.tool-form input[type="text"],
.tool-form input[type="number"],
.tool-form input[type="datetime-local"],
.tool-form select,
.tool-form textarea {
    width: 100%;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    border-radius: 14px;
    padding: 14px 16px;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.search-input:focus,
.tool-form input:focus,
.tool-form select:focus,
.tool-form textarea:focus {
    border-color: color-mix(in srgb, var(--primary) 50%, var(--border));
    box-shadow: 0 0 0 4px color-mix(in srgb, var(--primary) 14%, transparent);
}

.filter-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.pill {
    min-height: 40px;
    padding: 0 14px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--surface);
    color: var(--text-soft);
    font-weight: 700;
    cursor: pointer;
}

.pill.active {
    background: var(--primary-soft);
    border-color: color-mix(in srgb, var(--primary) 32%, var(--border));
    color: var(--primary);
}

.filterable-card.is-hidden {
    display: none !important;
}

.tool-main {
    display: grid;
    gap: 24px;
}

.tool-sidebar {
    position: sticky;
    top: 104px;
}

.tool-panel {
    padding: 24px;
}

.tool-form {
    display: grid;
    gap: 18px;
}

.tool-form label > span {
    display: inline-flex;
    margin-bottom: 8px;
    font-weight: 700;
    color: var(--text-soft);
}

.tool-form textarea {
    min-height: 160px;
    resize: vertical;
}

.inline-form {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: start;
}

.inline-form.columns-2 > label {
    flex: 1 1 240px;
}

.inline-form label,
.checkbox-grid label {
    color: var(--text-soft);
    font-weight: 600;
}

.inline-form input[type="radio"],
.checkbox-grid input[type="checkbox"] {
    margin-right: 8px;
    accent-color: var(--primary);
}

.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.form-actions,
.panel-title-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
}

.notice {
    margin-bottom: 14px;
    padding: 14px 16px;
    border-radius: 14px;
    font-weight: 700;
}

.notice-success {
    background: var(--success-bg);
    color: var(--success-text);
}

.notice-error {
    background: var(--error-bg);
    color: var(--error-text);
}

.output-block {
    margin: 0;
    padding: 18px;
    min-height: 180px;
    overflow: auto;
    border-radius: 16px;
    border: 1px solid var(--border);
    background: color-mix(in srgb, var(--surface-muted) 52%, var(--surface));
    white-space: pre-wrap;
    word-break: break-word;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.95rem;
}

.empty-state {
    display: grid;
    place-items: center;
    min-height: 180px;
    text-align: center;
    border-radius: 16px;
    border: 1px dashed var(--border);
    color: var(--text-muted);
    background: color-mix(in srgb, var(--surface-muted) 48%, var(--surface));
}

.mini-list {
    display: grid;
    gap: 12px;
}

.mini-list a {
    display: block;
    padding: 14px 16px;
    border-radius: 14px;
    border: 1px solid var(--border);
    background: var(--surface-muted);
}

.mini-list strong {
    display: block;
    margin-bottom: 5px;
}

.mini-list span {
    color: var(--text-muted);
    font-size: 0.92rem;
}

.article-body {
    padding: 28px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.article-body p,
.article-body li {
    color: var(--text-soft);
    font-size: 1.02rem;
}

.article-body h2 {
    margin: 30px 0 12px;
    font-size: 1.45rem;
    letter-spacing: -0.03em;
}

.article-body ul {
    padding-left: 20px;
}

.article-sidebar {
    display: grid;
    gap: 24px;
}

.site-footer {
    margin-top: 40px;
    border-top: 1px solid var(--border);
    background: var(--surface);
}

.footer-grid {
    padding: 36px 0 24px;
    display: grid;
    grid-template-columns: 1.2fr 1fr 1fr;
    gap: 24px;
}

.site-footer h3,
.site-footer h4 {
    margin: 0 0 12px;
    letter-spacing: -0.03em;
}

.site-footer p,
.footer-links a,
.footer-links li,
.footer-bottom {
    color: var(--text-muted);
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin: 10px 0;
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-bottom {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 12px;
    padding: 18px 0 34px;
    border-top: 1px solid var(--border);
}

@media (max-width: 1024px) {
    .hero-grid,
    .split-grid,
    .tool-layout,
    .article-layout,
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .tool-sidebar {
        position: static;
    }

    .tools-grid,
    .article-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .brand span {
        max-width: 340px;
    }
}

@media (max-width: 820px) {
    .site-nav {
        position: absolute;
        left: 16px;
        right: 16px;
        top: 78px;
        display: none;
        flex-direction: column;
        align-items: stretch;
        padding: 16px;
        border: 1px solid var(--border);
        background: var(--surface);
        border-radius: 18px;
        box-shadow: var(--shadow);
    }

    .site-nav.is-open {
        display: flex;
    }

    .site-nav a,
    .theme-toggle {
        width: 100%;
        justify-content: center;
    }

    .nav-toggle {
        display: inline-block;
    }

    .brand img {
        width: 48px;
    }

    .brand span {
        display: none;
    }
}

@media (max-width: 720px) {
    .tools-grid,
    .article-grid {
        grid-template-columns: 1fr;
    }

    .card-tool {
        grid-template-columns: 1fr;
    }

    .tool-icon {
        min-height: 72px;
        border-right: 0;
        border-bottom: 1px solid var(--border);
    }

    .checkbox-grid {
        grid-template-columns: 1fr;
    }

    .hero-section,
    .page-hero,
    .section {
        padding-top: 40px;
    }

    .container {
        width: min(100% - 20px, var(--container));
    }
}


.hero-home {
    position: relative;
}

.hero-home::before {
    content: "";
    position: absolute;
    inset: 0 0 auto;
    height: 100%;
    background:
        radial-gradient(circle at 10% 20%, color-mix(in srgb, var(--primary) 14%, transparent), transparent 38%),
        radial-gradient(circle at 90% 10%, color-mix(in srgb, var(--primary) 16%, transparent), transparent 32%);
    pointer-events: none;
}

.brand-card .keyword-row {
    margin-top: 12px;
}

.brand-card .keyword-row span {
    background: color-mix(in srgb, var(--surface-muted) 92%, var(--surface));
}

.tool-icon .icon-svg {
    display: inline-grid;
    place-items: center;
}

.tool-icon svg {
    width: 34px;
    height: 34px;
}

.notice-panel h3 {
    margin: 12px 0 10px;
}

.empty-state-large {
    min-height: 280px;
    padding: 28px;
}

.empty-state-large strong {
    display: block;
    margin-bottom: 10px;
    font-size: 1.12rem;
}

.empty-state-large p {
    max-width: 520px;
    margin: 0 auto;
    color: var(--text-soft);
}

.footer-grid-4 {
    grid-template-columns: 1.2fr 1fr 1fr 1fr;
}

.article-body a {
    color: var(--primary);
    font-weight: 700;
}

@media (max-width: 1024px) {
    .footer-grid-4 {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 720px) {
    .footer-grid-4 {
        grid-template-columns: 1fr;
    }
}