:root {
    color-scheme: light;
    --bg: #f5f7fb;
    --surface: #ffffff;
    --surface-2: #eef3f8;
    --text: #18212f;
    --muted: #647084;
    --line: #dbe3ee;
    --primary: #0f7c80;
    --primary-strong: #075d62;
    --accent: #bd6b00;
    --success: #247a48;
    --warning: #a15c00;
    --shadow: 0 18px 50px rgb(22 34 51 / 12%);
}

[data-theme="dark"] {
    color-scheme: dark;
    --bg: #101418;
    --surface: #171d24;
    --surface-2: #202a34;
    --text: #edf3f8;
    --muted: #a5b2c0;
    --line: #2d3a48;
    --primary: #4dbbc0;
    --primary-strong: #8adce0;
    --accent: #f2a64a;
    --success: #74d39b;
    --warning: #f2bd63;
    --shadow: 0 22px 55px rgb(0 0 0 / 28%);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.5;
}

a {
    color: inherit;
}

.skip-link {
    position: absolute;
    left: -999px;
    top: 12px;
    z-index: 20;
    padding: 10px 14px;
    background: var(--surface);
    border: 1px solid var(--line);
}

.skip-link:focus {
    left: 12px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: color-mix(in srgb, var(--surface) 90%, transparent);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(18px);
}

.nav {
    max-width: 1160px;
    margin: 0 auto;
    padding: 14px 20px;
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 18px;
    align-items: center;
}

.brand {
    text-decoration: none;
    display: inline-flex;
    gap: 10px;
    align-items: center;
    font-weight: 800;
    letter-spacing: 0;
}

.brand-mark {
    width: 34px;
    height: 34px;
    border-radius: 8px;
    display: grid;
    place-items: center;
    background: var(--primary);
    color: #fff;
    font-weight: 900;
}

.nav-links {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
}

.nav-links a,
.footer-links a {
    color: var(--muted);
    text-decoration: none;
    font-size: 0.94rem;
}

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

.settings-menu {
    position: relative;
    display: flex;
    justify-content: flex-end;
}

.icon-button {
    width: 38px;
    height: 38px;
    display: grid;
    place-items: center;
    border: 1px solid var(--line);
    background: var(--surface-2);
    color: var(--text);
    border-radius: 8px;
    cursor: pointer;
}

.icon-button svg {
    width: 20px;
    height: 20px;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.8;
    stroke-linejoin: round;
    stroke-linecap: round;
}

.icon-button:hover,
.icon-button[aria-expanded="true"] {
    border-color: color-mix(in srgb, var(--primary) 48%, var(--line));
    color: var(--primary-strong);
}

.settings-popover {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    width: min(240px, calc(100vw - 28px));
    z-index: 30;
    padding: 14px;
    border: 1px solid var(--line);
    background: var(--surface);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.settings-popover[hidden] {
    display: none;
}

.field.compact {
    gap: 7px;
}

.theme-toggle {
    border: 1px solid var(--line);
    background: var(--surface-2);
    color: var(--text);
    border-radius: 8px;
    padding: 8px 10px;
    font: inherit;
}

.hero {
    max-width: 1160px;
    margin: 0 auto;
    padding: 56px 20px 36px;
    display: block;
}

.hero h1,
.tool-hero h1 {
    margin: 0;
    max-width: 780px;
    font-size: clamp(2.2rem, 4vw, 4.2rem);
    line-height: 1.02;
    letter-spacing: 0;
}

.hero p,
.tool-hero p {
    color: var(--muted);
    max-width: 720px;
    font-size: 1.08rem;
}

.hero-panel {
    border: 1px solid var(--line);
    background: var(--surface);
    border-radius: 8px;
    padding: 20px;
}

.result-grid,
.tool-grid {
    display: grid;
    gap: 14px;
}

.result-box,
.tool-card,
.form-panel,
.content-panel,
.ad-slot {
    border: 1px solid var(--line);
    background: var(--surface);
    border-radius: 8px;
}

.result-box {
    padding: 14px;
}

.result-box span {
    color: var(--muted);
    font-size: 0.85rem;
}

.result-box strong {
    display: block;
    margin-top: 4px;
    font-size: 1.35rem;
}

.tool-grid {
    max-width: 1160px;
    margin: 0 auto;
    padding: 20px;
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.tool-card {
    padding: 18px;
    text-decoration: none;
    min-height: 240px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}

.tool-card:hover {
    transform: translateY(-3px);
    border-color: color-mix(in srgb, var(--primary) 55%, var(--line));
    box-shadow: var(--shadow);
}

.chip {
    width: fit-content;
    color: var(--primary-strong);
    background: color-mix(in srgb, var(--primary) 12%, transparent);
    border: 1px solid color-mix(in srgb, var(--primary) 32%, var(--line));
    border-radius: 999px;
    padding: 4px 9px;
    font-size: 0.78rem;
    font-weight: 700;
}

.icon-tile {
    width: 46px;
    height: 46px;
    display: grid;
    place-items: center;
    border-radius: 8px;
    background: var(--surface-2);
    color: var(--accent);
    font-size: 1.35rem;
}

.tool-card h2 {
    margin: 0;
    font-size: 1.1rem;
}

.tool-card p {
    margin: 0;
    color: var(--muted);
}

.section {
    max-width: 1160px;
    margin: 0 auto;
    padding: 34px 20px;
}

.tool-hero {
    max-width: 1160px;
    margin: 0 auto;
    padding: 42px 20px 22px;
}

.tool-layout {
    max-width: 1160px;
    margin: 0 auto;
    padding: 12px 20px 38px;
    display: grid;
    grid-template-columns: minmax(320px, 0.82fr) minmax(0, 1fr);
    gap: 22px;
    align-items: start;
}

.form-panel,
.content-panel {
    padding: 20px;
}

.company-panel {
    margin-top: 16px;
}

.company-details {
    display: grid;
    gap: 12px;
    margin: 0;
}

.company-details div {
    display: grid;
    gap: 4px;
    padding-top: 12px;
    border-top: 1px solid var(--line);
}

.company-details dt {
    color: var(--muted);
    font-size: 0.85rem;
    font-weight: 800;
}

.company-details dd {
    margin: 0;
}

.result-stack {
    display: grid;
    gap: 14px;
}

.field-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.field {
    display: grid;
    gap: 6px;
}

.field.full {
    grid-column: 1 / -1;
}

label {
    font-weight: 700;
    font-size: 0.92rem;
}

input,
select {
    width: 100%;
    border: 1px solid var(--line);
    background: var(--bg);
    color: var(--text);
    border-radius: 8px;
    padding: 11px 12px;
    font: inherit;
}

input:focus,
select:focus {
    outline: 2px solid color-mix(in srgb, var(--primary) 40%, transparent);
    border-color: var(--primary);
}

.checkbox-row {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    padding: 10px 0;
}

.checkbox-row input {
    width: auto;
    margin-top: 5px;
}

.button-row {
    display: flex;
    gap: 10px;
    align-items: center;
    margin-top: 16px;
    flex-wrap: wrap;
}

.btn {
    border: 0;
    background: var(--primary);
    color: #fff;
    border-radius: 8px;
    padding: 12px 16px;
    text-decoration: none;
    font-weight: 800;
    cursor: pointer;
}

.btn.secondary {
    background: var(--surface-2);
    color: var(--text);
    border: 1px solid var(--line);
}

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

.result-box.primary {
    grid-column: 1 / -1;
    background: color-mix(in srgb, var(--primary) 11%, var(--surface));
}

.result-box.primary strong {
    font-size: 2rem;
}

.notice {
    border-left: 4px solid var(--warning);
    background: color-mix(in srgb, var(--warning) 10%, var(--surface));
    padding: 12px 14px;
    border-radius: 8px;
    color: var(--text);
}

.source-list {
    padding-left: 18px;
}

.source-list a {
    color: var(--primary-strong);
}

.ad-slot {
    min-height: 110px;
    display: grid;
    place-items: center;
    color: var(--muted);
    background: repeating-linear-gradient(135deg, var(--surface), var(--surface) 12px, var(--surface-2) 12px, var(--surface-2) 24px);
}

.faq details {
    border-top: 1px solid var(--line);
    padding: 14px 0;
}

.faq summary {
    cursor: pointer;
    font-weight: 800;
}

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

.footer-inner {
    max-width: 1160px;
    margin: 0 auto;
    padding: 24px 20px;
    display: flex;
    justify-content: space-between;
    gap: 20px;
    flex-wrap: wrap;
}

.footer-links {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.footer-company {
    display: block;
    margin-top: 6px;
    color: var(--muted);
    font-size: 0.82rem;
}

.error-list {
    color: #a22;
    background: #fff1f1;
    border: 1px solid #ffd2d2;
    border-radius: 8px;
    padding: 12px 16px;
}

@media (max-width: 900px) {
    .nav,
    .hero,
    .tool-layout {
        grid-template-columns: 1fr;
    }

    .nav-links {
        justify-content: flex-start;
    }

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

@media (max-width: 620px) {
    .field-grid,
    .result-grid,
    .tool-grid {
        grid-template-columns: 1fr;
    }

    .hero,
    .tool-hero,
    .section {
        padding-left: 14px;
        padding-right: 14px;
    }

    .tool-layout {
        padding-left: 14px;
        padding-right: 14px;
    }
}