:root {
    --green-900: #173d31;
    --green-800: #1f5a43;
    --green-700: #2d7257;
    --blue-700: #236b84;
    --gold-500: #d2a74b;
    --cream-100: #f7f4ec;
    --cream-200: #eee8dc;
    --white: #ffffff;
    --text: #24312c;
    --muted: #5f6c66;
    --border: #d8dfda;
    --shadow: 0 18px 50px rgba(28, 57, 45, 0.10);
    --radius-sm: 10px;
    --radius-md: 18px;
    --radius-lg: 28px;
    --wrap: 1180px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--white);
    color: var(--text);
    font-family: Arial, Helvetica, sans-serif;
    font-size: 17px;
    line-height: 1.65;
}

body.menu-open {
    overflow: hidden;
}

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

a {
    color: var(--green-800);
    text-underline-offset: 0.18em;
}

a:hover {
    color: var(--blue-700);
}

button,
a {
    -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
a:focus-visible {
    outline: 3px solid var(--gold-500);
    outline-offset: 3px;
}

h1,
h2,
h3 {
    color: var(--green-900);
    font-family: Georgia, 'Times New Roman', serif;
    line-height: 1.14;
    margin-top: 0;
}

h1 {
    font-size: clamp(2.5rem, 6vw, 5.4rem);
    letter-spacing: -0.035em;
    margin-bottom: 0.32em;
}

h2 {
    font-size: clamp(1.8rem, 3.5vw, 3rem);
    letter-spacing: -0.02em;
    margin-bottom: 0.55em;
}

h3 {
    font-size: 1.34rem;
    margin-bottom: 0.45em;
}

p {
    margin-top: 0;
    margin-bottom: 1.1em;
}

.wrap {
    width: min(calc(100% - 32px), var(--wrap));
    margin-inline: auto;
}

.skip-link {
    position: fixed;
    top: 8px;
    left: 8px;
    z-index: 1000;
    transform: translateY(-160%);
    background: var(--white);
    color: var(--green-900);
    padding: 10px 14px;
    border-radius: 6px;
    box-shadow: var(--shadow);
}

.skip-link:focus {
    transform: translateY(0);
}

.site-header {
    position: relative;
    z-index: 30;
    background: var(--white);
    border-bottom: 1px solid var(--border);
}

.site-header__inner {
    min-height: 82px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.site-brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    color: var(--green-900);
    text-decoration: none;
}

.site-brand__mark {
    display: grid;
    place-items: center;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: var(--green-800);
    color: var(--white);
    font-weight: 800;
    letter-spacing: 0.03em;
}

.site-brand__text {
    display: grid;
    line-height: 1.1;
}

.site-brand__text strong {
    font-family: Georgia, 'Times New Roman', serif;
    font-size: 1.25rem;
}

.site-brand__text small {
    color: var(--muted);
    font-size: 0.72rem;
    margin-top: 4px;
}

.desktop-nav ul,
.mobile-menu ul,
.site-footer ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.desktop-nav ul {
    display: flex;
    align-items: center;
    gap: 4px;
}

.desktop-nav a {
    display: block;
    padding: 12px 10px;
    border-radius: 8px;
    color: var(--text);
    font-size: 0.91rem;
    font-weight: 700;
    text-decoration: none;
}

.desktop-nav a:hover,
.desktop-nav a.is-active {
    background: var(--cream-100);
    color: var(--green-800);
}

.menu-toggle {
    display: none;
    width: 48px;
    height: 48px;
    padding: 11px;
    border: 0;
    border-radius: 10px;
    background: var(--green-800);
    cursor: pointer;
}

.menu-toggle span {
    display: block;
    height: 2px;
    background: var(--white);
    margin: 5px 0;
}

.menu-overlay {
    position: fixed;
    inset: 0;
    z-index: 80;
    background: rgba(13, 28, 22, 0.56);
    opacity: 0;
    transition: opacity 220ms ease;
}

.menu-overlay.is-visible {
    opacity: 1;
}

.mobile-menu {
    position: fixed;
    top: 0;
    right: 0;
    z-index: 90;
    width: min(88vw, 390px);
    height: 100dvh;
    overflow-y: auto;
    background: var(--white);
    box-shadow: -20px 0 50px rgba(0, 0, 0, 0.18);
    transform: translateX(105%);
    transition: transform 240ms ease;
}

.mobile-menu.is-open {
    transform: translateX(0);
}

.mobile-menu__top {
    min-height: 76px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    border-bottom: 1px solid var(--border);
}

.mobile-menu__top strong {
    color: var(--green-900);
    font-family: Georgia, 'Times New Roman', serif;
    font-size: 1.35rem;
}

.mobile-menu__close {
    width: 48px;
    height: 48px;
    border: 0;
    border-radius: 10px;
    background: var(--cream-100);
    color: var(--green-900);
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
}

.mobile-menu nav {
    padding: 14px;
}

.mobile-menu a {
    display: block;
    min-height: 50px;
    padding: 13px 14px;
    border-radius: 9px;
    color: var(--text);
    font-weight: 700;
    text-decoration: none;
}

.mobile-menu a:hover,
.mobile-menu a.is-active {
    background: var(--cream-100);
    color: var(--green-800);
}

.eyebrow {
    color: var(--green-700);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    margin-bottom: 14px;
}

.home-hero {
    background: linear-gradient(135deg, var(--cream-100), #edf4ef);
    border-bottom: 1px solid var(--cream-200);
}

.home-hero__grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(360px, 0.82fr);
    align-items: center;
    gap: clamp(38px, 6vw, 90px);
    min-height: 670px;
    padding-block: 72px;
}

.home-hero__grid--single {
    grid-template-columns: minmax(0, 820px);
    justify-content: start;
    min-height: 560px;
}

.home-hero__lead {
    max-width: 680px;
    color: var(--muted);
    font-size: clamp(1.13rem, 2vw, 1.38rem);
}

.home-hero__image,
.page-hero {
    margin: 0;
}

.home-hero__image img,
.page-hero img {
    width: 100%;
    object-fit: cover;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.home-hero__image img {
    aspect-ratio: 4 / 5;
}

.page-hero {
    margin-top: -10px;
    margin-bottom: 0;
}

.page-hero img {
    aspect-ratio: 16 / 9;
}

.page-hero--portrait img {
    max-width: 760px;
    margin-inline: auto;
}

.button-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 28px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 12px 20px;
    border: 2px solid transparent;
    border-radius: 999px;
    font-weight: 800;
    text-decoration: none;
}

.button--primary {
    background: var(--green-800);
    color: var(--white);
}

.button--primary:hover {
    background: var(--green-900);
    color: var(--white);
}

.button--secondary {
    border-color: var(--green-800);
    color: var(--green-800);
}

.button--secondary:hover {
    background: var(--green-800);
    color: var(--white);
}

.section {
    padding-block: clamp(64px, 8vw, 104px);
}

.section--soft {
    background: var(--cream-100);
    border-block: 1px solid var(--cream-200);
}

.section-heading {
    max-width: 760px;
    margin-bottom: 38px;
}

.section-heading > p:last-child,
.page-intro__summary {
    color: var(--muted);
    font-size: 1.12rem;
}

.section-heading--center {
    margin-inline: auto;
    text-align: center;
}

.feature-grid,
.topic-grid,
.region-grid,
.info-grid {
    display: grid;
    gap: 20px;
}

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

.feature-grid--four {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.feature-card,
.topic-card,
.region-grid article,
.info-grid > div,
.aside-card,
.note-card {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--white);
}

.feature-card {
    display: block;
    min-height: 100%;
    padding: 26px;
    color: var(--text);
    text-decoration: none;
    transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.feature-card:not(.feature-card--static):hover {
    transform: translateY(-4px);
    border-color: #b8c8bf;
    box-shadow: var(--shadow);
}

.feature-card__number {
    display: inline-block;
    color: var(--gold-500);
    font-size: 0.78rem;
    font-weight: 800;
    margin-bottom: 42px;
}

.feature-card h2,
.feature-card h3 {
    font-size: 1.55rem;
}

.split-panel {
    display: grid;
    grid-template-columns: 0.75fr 1.25fr;
    gap: clamp(32px, 7vw, 100px);
    align-items: start;
}

.text-link {
    font-weight: 800;
}

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

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

.topic-card,
.region-grid article,
.info-grid > div {
    padding: 26px;
}

.page-intro {
    padding-top: clamp(60px, 8vw, 110px);
    padding-bottom: 44px;
    max-width: 960px;
}

.page-intro h1 {
    max-width: 900px;
    font-size: clamp(2.7rem, 6vw, 5rem);
}

.page-intro__summary {
    max-width: 760px;
}

.content-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 60px;
    align-items: start;
}

.article-content {
    max-width: 760px;
}

.article-content h2:not(:first-child),
.prose h2:not(:first-child) {
    margin-top: 2em;
}

.article-aside {
    position: sticky;
    top: 24px;
}

.aside-card,
.note-card {
    padding: 24px;
    background: var(--cream-100);
}

.aside-card h2,
.note-card h2 {
    font-size: 1.45rem;
}

.info-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-block: 28px;
}

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

.content-narrow {
    max-width: 820px;
}

.check-list {
    padding-left: 1.2em;
    margin: 0;
}

.error-page {
    min-height: 62vh;
    display: grid;
    align-content: center;
    justify-items: start;
    padding-block: 70px;
}

.site-footer {
    background: var(--green-900);
    color: rgba(255, 255, 255, 0.82);
    padding-top: 64px;
}

.site-footer__grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 50px;
}

.site-footer__brand {
    display: inline-block;
    color: var(--white);
    font-family: Georgia, 'Times New Roman', serif;
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 12px;
    text-decoration: none;
}

.site-footer h2 {
    color: var(--white);
    font-family: Arial, Helvetica, sans-serif;
    font-size: 0.9rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.site-footer li + li {
    margin-top: 8px;
}

.site-footer a {
    color: rgba(255, 255, 255, 0.88);
}

.site-footer__bottom {
    margin-top: 50px;
    padding-block: 22px;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    font-size: 0.88rem;
}

.site-footer__bottom p {
    margin: 0;
}

@media (max-width: 1100px) {
    .desktop-nav a {
        padding-inline: 7px;
        font-size: 0.84rem;
    }

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

@media (max-width: 979px) {
    .desktop-nav {
        display: none;
    }

    .menu-toggle {
        display: block;
    }

    .home-hero__grid {
        grid-template-columns: 1fr;
        min-height: 0;
        padding-block: 58px;
    }

    .home-hero__image img {
        aspect-ratio: 16 / 10;
    }

    .content-layout {
        grid-template-columns: 1fr;
        gap: 34px;
    }

    .article-aside {
        position: static;
    }
}

@media (max-width: 760px) {
    body {
        font-size: 16px;
    }

    .site-header__inner {
        min-height: 72px;
    }

    .site-brand__text small {
        display: none;
    }

    .feature-grid,
    .feature-grid--four,
    .topic-grid,
    .topic-grid--two,
    .region-grid,
    .info-grid,
    .split-panel,
    .site-footer__grid {
        grid-template-columns: 1fr;
    }

    .section {
        padding-block: 58px;
    }

    .page-intro {
        padding-top: 54px;
        padding-bottom: 32px;
    }

    .site-footer__grid {
        gap: 30px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}

/* Version 2: Backyard bird guide articles */
.breadcrumbs {
    padding-top: 28px;
    color: var(--muted);
    font-size: 0.86rem;
}

.breadcrumbs ol {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
}

.breadcrumbs li:not(:last-child)::after {
    content: "/";
    margin-left: 7px;
    color: #9aa59f;
}

.breadcrumbs a {
    color: var(--muted);
}

.breadcrumbs + .page-intro {
    padding-top: 38px;
}

.article-shell {
    padding-top: clamp(52px, 7vw, 84px);
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 22px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
    color: var(--muted);
    font-size: 0.9rem;
}

.answer-box {
    max-width: 920px;
    margin-block: 32px 52px;
    padding: clamp(24px, 4vw, 36px);
    border: 1px solid #cad9d0;
    border-left: 6px solid var(--green-700);
    border-radius: var(--radius-md);
    background: #f2f7f4;
}

.answer-box h2 {
    font-size: clamp(1.55rem, 3vw, 2.15rem);
}

.answer-box p:last-child {
    margin-bottom: 0;
}

.prose ul,
.prose ol,
.aside-list {
    padding-left: 1.35em;
}

.prose li + li,
.aside-list li + li,
.check-list li + li {
    margin-top: 0.55em;
}

.prose h3 {
    margin-top: 1.5em;
}

.aside-card--spaced {
    margin-top: 20px;
}

.aside-card p:last-child,
.aside-card ul:last-child,
.aside-card ol:last-child {
    margin-bottom: 0;
}

.topic-card--link {
    display: block;
    color: var(--text);
    text-decoration: none;
    transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.topic-card--link:hover {
    transform: translateY(-4px);
    border-color: #b8c8bf;
    box-shadow: var(--shadow);
}

@media (max-width: 760px) {
    .breadcrumbs {
        padding-top: 20px;
    }

    .breadcrumbs + .page-intro {
        padding-top: 28px;
    }

    .answer-box {
        margin-bottom: 38px;
    }
}

/* Version 3: birdseed comparison and feeder-care tables */
.table-scroll {
    max-width: 100%;
    margin-block: 28px 38px;
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--white);
}

.table-scroll:focus-visible {
    outline: 3px solid var(--gold-500);
    outline-offset: 3px;
}

.guide-table {
    width: 100%;
    min-width: 680px;
    border-collapse: collapse;
    font-size: 0.96rem;
    line-height: 1.5;
}

.guide-table th,
.guide-table td {
    padding: 16px 18px;
    border-bottom: 1px solid var(--border);
    text-align: left;
    vertical-align: top;
}

.guide-table th {
    background: var(--green-900);
    color: var(--white);
    font-size: 0.82rem;
    letter-spacing: 0.04em;
}

.guide-table tbody tr:last-child td {
    border-bottom: 0;
}

.guide-table tbody tr:nth-child(even) {
    background: var(--cream-100);
}

.reference-list {
    padding-left: 1.25em;
}

.reference-list li + li {
    margin-top: 0.65em;
}

@media (max-width: 760px) {
    .table-scroll {
        margin-inline: -4px;
    }

    .guide-table th,
    .guide-table td {
        padding: 14px;
    }
}