* {
    box-sizing: border-box;
}

:root {
    --green: #0b7a37;
    --green-dark: #065c28;
    --green-soft: #e9f7ee;
    --text: #182028;
    --muted: #52606d;
    --border: #d9e1e7;
    --bg: #f5f7f9;
    --card: #ffffff;
    --danger: #b42318;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.55;
}

a {
    color: var(--green);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.container {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
}

.site-header {
    background: #fff;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    min-height: 72px;
}

.site-logo {
    font-size: 30px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.logo-strong {
    color: var(--text);
}

.logo-accent {
    color: var(--green);
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.site-nav a,
.footer-links a {
    color: var(--muted);
    font-weight: 600;
}

.site-main {
    padding: 24px 0 48px;
}

.breadcrumbs {
    font-size: 14px;
    color: var(--muted);
    margin: 0 0 18px;
}

.breadcrumbs span,
.breadcrumbs a {
    margin-right: 6px;
}

.home-hero,
.page-shell,
.converter-card,
.content-block,
.sidebar-card,
.tool-card,
.feature-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    box-shadow: 0 8px 30px rgba(16, 24, 40, 0.04);
}

.home-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(280px, 380px);
    gap: 24px;
    padding: 30px;
    margin-bottom: 24px;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
    border-radius: 999px;
    background: var(--green-soft);
    color: var(--green-dark);
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 14px;
}

.home-hero h1,
.page-title {
    margin: 0 0 12px;
    font-size: clamp(31px, 5vw, 44px);
    line-height: 1.1;
    color: var(--text);
    letter-spacing: -0.03em;
}

.page-title {
    font-size: clamp(28px, 4.5vw, 38px);
}

.home-hero p,
.page-intro,
.content-block p,
.tool-card p,
.feature-card p,
.footer-copy,
.faq-item p,
.hero-panel li {
    color: var(--muted);
    font-size: 16px;
}

.hero-actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 18px;
}

.hero-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.text-link {
    font-weight: 700;
}

.hero-panel {
    padding: 20px;
    background: linear-gradient(180deg, #f8fdf9 0%, #eef8f1 100%);
    border-radius: 12px;
    border: 1px solid #d4ebdb;
}

.hero-panel h2,
.content-block h2,
.feature-card h2,
.tool-card h3,
.faq-item h3 {
    margin: 0 0 12px;
    color: var(--text);
}

.check-list {
    margin: 0;
    padding-left: 20px;
}

.check-list li {
    margin-bottom: 10px;
}

.content-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 24px;
    align-items: start;
}

.main-content {
    min-width: 0;
}

.converter-card,
.content-block,
.page-shell {
    padding: 24px;
    margin-bottom: 24px;
}

.converter-card {
    max-width: 760px;
}

.form-row {
    display: grid;
    grid-template-columns: 64px minmax(150px, 1fr) minmax(120px, 180px);
    align-items: center;
    gap: 14px;
    margin-bottom: 12px;
}

.field-label {
    font-weight: 700;
    color: var(--text);
}

.text-input {
    width: 100%;
    min-height: 52px;
    border: 1px solid #b7c4ce;
    border-radius: 12px;
    padding: 12px 14px;
    font-size: 20px;
    background: #fff;
    color: var(--text);
}

.result-input {
    background: #f8fbfd;
}

.text-input:focus {
    outline: none;
    border-color: var(--green);
    box-shadow: 0 0 0 4px rgba(11, 122, 55, 0.12);
}

.unit-label {
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
}

.swap-row {
    display: flex;
    justify-content: flex-end;
    margin: -2px 132px 8px 0;
}

.swap-button {
    width: 48px;
    height: 48px;
    border-radius: 999px;
    display: grid;
    place-items: center;
    background: var(--green-soft);
    color: var(--green-dark);
    font-size: 26px;
    font-weight: 700;
    border: 1px solid #cbe5d4;
}

.swap-button:hover {
    text-decoration: none;
    background: #dff0e5;
}

.button-row {
    display: flex;
    gap: 12px;
    margin-top: 16px;
    padding-left: 78px;
}

.action-button {
    min-width: 112px;
    min-height: 46px;
    border: none;
    border-radius: 999px;
    background: var(--green);
    color: #fff;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    padding: 0 18px;
}

.action-button.secondary {
    background: #edf3f7;
    color: var(--text);
    border: 1px solid #c9d5de;
}

.action-button:hover {
    filter: brightness(1.03);
    text-decoration: none;
}

.form-message {
    margin: 16px 0 0 78px;
    min-height: 24px;
    font-size: 14px;
    font-weight: 600;
}

.form-message.error {
    color: var(--danger);
}

.form-message.success {
    color: var(--green-dark);
}

.section-header-row {
    margin-bottom: 14px;
}

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

.cards-grid,
.home-category-grid,
.home-feature-grid,
.popular-links-grid {
    display: grid;
    gap: 16px;
}

.cards-grid,
.home-feature-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.home-category-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.tool-card,
.feature-card,
.home-category-card {
    padding: 20px;
}

.tool-card h3,
.home-category-card h3 {
    font-size: 20px;
}

.tool-card h3 a {
    color: var(--text);
}

.category-link-list,
.popular-links,
.sidebar-list {
    margin: 0;
    padding-left: 18px;
}

.category-link-list li,
.popular-links li,
.sidebar-list li {
    margin-bottom: 8px;
}

.table-wrap {
    overflow-x: auto;
}

.conversion-table {
    width: 100%;
    min-width: 420px;
    border-collapse: collapse;
}

.conversion-table th,
.conversion-table td {
    border: 1px solid var(--border);
    padding: 10px 12px;
    text-align: left;
}

.conversion-table th {
    background: #f1f7f3;
}

.faq-item + .faq-item {
    border-top: 1px solid var(--border);
    padding-top: 16px;
    margin-top: 16px;
}

.sidebar {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.sidebar-card {
    padding: 20px;
}

.promo-card {
    background: linear-gradient(180deg, #f8fdf9 0%, #eef8f1 100%);
    border-color: #d4ebdb;
}

.promo-label {
    color: var(--green-dark);
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 10px;
}

.promo-card h2 {
    margin: 0 0 10px;
    font-size: 22px;
}

.promo-card p {
    margin: 0 0 14px;
}

.promo-link {
    font-weight: 700;
}

.sidebar-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
}

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

.footer-inner {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    padding: 24px 0 36px;
}

.footer-copy {
    margin: 8px 0 0;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-content: flex-start;
}

@media (max-width: 920px) {
    .content-grid,
    .home-hero {
        grid-template-columns: 1fr;
    }

    .site-header {
        position: static;
    }

    .header-inner,
    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 720px) {
    .container {
        width: min(100% - 20px, 1160px);
    }

    .converter-card,
    .content-block,
    .page-shell,
    .home-hero,
    .sidebar-card,
    .tool-card,
    .feature-card,
    .home-category-card {
        padding: 18px;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .field-label {
        margin-bottom: -2px;
    }

    .swap-row {
        justify-content: center;
        margin: 4px 0 12px;
    }

    .button-row,
    .form-message {
        padding-left: 0;
        margin-left: 0;
    }

    .button-row {
        flex-wrap: wrap;
    }

    .site-logo {
        font-size: 26px;
    }
}