:root,
[data-theme="dark"] {
    color-scheme: dark;
    --background: #0f0e17;
    --surface: #1a1926;
    --surface-strong: #232232;
    --text: #fffffe;
    --muted: #b8b8c8;
    --primary: #ff9d32;
    --primary-hover: #ffb45f;
    --on-primary: #1c1103;
    --border: #3a3950;
    --input: #16151f;
    --danger: #ff8778;
    --hero-start: #ff9d32;
    --hero-end: #ff6f61;
    --font: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

[data-theme="light"] {
    color-scheme: light;
    --background: #f5f3ef;
    --surface: #ffffff;
    --surface-strong: #ece9e3;
    --text: #1a1a2e;
    --muted: #505064;
    --primary: #9a5200;
    --primary-hover: #743e00;
    --on-primary: #ffffff;
    --border: #c9c5bd;
    --input: #fafaf8;
    --danger: #a11b0a;
    --hero-start: #a85a00;
    --hero-end: #b83525;
}

[data-theme="geocities"] {
    color-scheme: dark;
    --background: #000080;
    --surface: #000066;
    --surface-strong: #000044;
    --text: #ffff00;
    --muted: #00ffff;
    --primary: #ff00ff;
    --primary-hover: #ff66ff;
    --on-primary: #000000;
    --border: #ffff00;
    --input: #000044;
    --danger: #ff8080;
    --hero-start: #ff00ff;
    --hero-end: #00ff00;
    --font: "Comic Sans MS", "Comic Sans", cursive;
}

* {
    box-sizing: border-box;
}

html {
    min-width: 20rem;
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    margin: 0;
    background: var(--background);
    color: var(--text);
    font-family: var(--font);
    line-height: 1.6;
    transition: background-color 180ms ease, color 180ms ease;
}

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

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

button,
input {
    font: inherit;
}

:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 3px;
}

[hidden] {
    display: none !important;
}

.container {
    width: min(100% - 2rem, 64rem);
    margin-inline: auto;
}

.skip-link {
    position: fixed;
    z-index: 1000;
    top: 0;
    left: 1rem;
    padding: 0.75rem 1rem;
    border-radius: 0 0 0.5rem 0.5rem;
    background: var(--primary);
    color: var(--on-primary);
    font-weight: 700;
    transform: translateY(-110%);
}

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

.site-header {
    position: sticky;
    z-index: 100;
    top: 0;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
    background: color-mix(in srgb, var(--surface) 92%, transparent);
    backdrop-filter: blur(12px);
}

.nav,
.nav-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav {
    min-height: 4rem;
}

.nav-actions {
    gap: 0.75rem;
}

.brand {
    color: var(--text);
    font-size: 1.15rem;
    font-weight: 800;
    text-decoration: none;
}

.icon-link {
    display: grid;
    width: 2.75rem;
    height: 2.75rem;
    place-items: center;
    border-radius: 0.65rem;
}

.icon-link svg {
    fill: currentColor;
}

.theme-toggle {
    width: 2.75rem;
    height: 2.75rem;
    border: 2px solid var(--border);
    border-radius: 0.65rem;
    background: transparent;
    color: var(--text);
    cursor: pointer;
    font-size: 1.35rem;
}

.theme-toggle:hover {
    border-color: var(--primary);
}

.hero {
    padding: clamp(3rem, 8vw, 6rem) 0;
    text-align: center;
}

.hero h1 {
    max-width: 14ch;
    margin: 0 auto 1.25rem;
    background: linear-gradient(135deg, var(--hero-start), var(--hero-end), var(--hero-start));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
    font-size: clamp(2.5rem, 7vw, 4.5rem);
    font-weight: 900;
    letter-spacing: -0.045em;
    line-height: 1.05;
}

.hero p {
    max-width: 45rem;
    margin: 0 auto;
    color: var(--muted);
    font-size: clamp(1.05rem, 2vw, 1.25rem);
}

.card,
.breakdown {
    border: 1px solid var(--border);
    border-radius: 1rem;
    background: var(--surface);
    box-shadow: 0 1rem 2.5rem rgb(0 0 0 / 12%);
}

.card {
    padding: clamp(1.25rem, 4vw, 2rem);
}

.card h2,
.card h3,
.breakdown h2,
.breakdown h3 {
    margin-top: 0;
    line-height: 1.25;
}

.calculator {
    max-width: 30rem;
    margin: 0 auto 4rem;
}

.calculator h2 {
    margin-bottom: 1.5rem;
    text-align: center;
}

.field + .field {
    margin-top: 1rem;
}

.field label {
    display: block;
    margin-bottom: 0.35rem;
    color: var(--muted);
    font-weight: 700;
}

.field input {
    width: 100%;
    padding: 0.8rem 0.9rem;
    border: 1px solid var(--border);
    border-radius: 0.55rem;
    background: var(--input);
    color: var(--text);
}

.field input:focus {
    border-color: var(--primary);
}

.button {
    display: inline-flex;
    width: 100%;
    min-height: 3rem;
    align-items: center;
    justify-content: center;
    margin-top: 1.25rem;
    padding: 0.7rem 1rem;
    border: 0;
    border-radius: 0.55rem;
    background: var(--primary);
    color: var(--on-primary);
    cursor: pointer;
    font-weight: 800;
    text-align: center;
    text-decoration: none;
}

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

.form-error {
    margin: 1rem 0 0;
    color: var(--danger);
    font-weight: 700;
}

.results {
    margin-bottom: 4rem;
}

.card-grid {
    display: grid;
    gap: 1.25rem;
}

.share-grid {
    margin-top: 1.25rem;
    margin-bottom: 1.25rem;
}

.share-help {
    color: var(--muted);
}

.share-text {
    width: 100%;
    min-height: 7rem;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 0.55rem;
    background: var(--input);
    color: var(--text);
    font: inherit;
    line-height: 1.45;
    resize: vertical;
}

.copy-status {
    min-height: 1.5rem;
    margin: 0.5rem 0 0;
    color: var(--muted);
}

.breakdown {
    padding: clamp(1.5rem, 5vw, 3rem);
    border-width: 2px;
    border-color: var(--primary);
    background: linear-gradient(135deg, var(--surface), var(--surface-strong));
}

.breakdown h3,
.stat {
    color: var(--primary);
}

.stats-list {
    display: grid;
    gap: 0.55rem;
    padding-left: 1.4rem;
}

.learn-grid {
    margin-bottom: 4rem;
}

.learn-grid .card {
    display: flex;
    flex-direction: column;
}

.learn-grid .button {
    margin-top: auto;
}

.site-footer {
    padding: 2rem 0;
    border-top: 1px solid var(--border);
    color: var(--muted);
    font-size: 0.9rem;
    text-align: center;
}

.retro-marquee,
.retro-visitor {
    display: none;
}

[data-theme="geocities"] body {
    background-image:
        radial-gradient(circle at 20% 30%, rgb(255 255 255 / 12%) 0 1px, transparent 2px),
        radial-gradient(circle at 80% 70%, rgb(0 255 255 / 16%) 0 1px, transparent 2px);
    background-size: 24px 24px, 36px 36px;
}

[data-theme="geocities"] .card,
[data-theme="geocities"] .breakdown {
    border-width: 3px;
    border-style: dashed;
    border-radius: 0;
    box-shadow: none;
}

[data-theme="geocities"] .button {
    border: 3px outset #ff00ff;
    border-radius: 0;
}

[data-theme="geocities"] .retro-marquee {
    display: block;
    overflow: hidden;
    padding: 0.5rem;
    background: #ff00ff;
    color: #ffff00;
    font-size: 1.1rem;
    font-weight: 700;
    white-space: nowrap;
}

[data-theme="geocities"] .retro-marquee span {
    display: inline-block;
    animation: marquee 12s linear infinite;
}

[data-theme="geocities"] .retro-visitor {
    display: table;
    margin: 0 auto 2rem;
    padding: 0.25rem 0.75rem;
    border: 2px solid #00ff00;
    background: #000000;
    color: #00ff00;
    font-family: "Courier New", monospace;
}

[data-theme="geocities"] .retro-visitor span {
    animation: blink 1s step-end infinite;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    margin: -1px;
    padding: 0;
    border: 0;
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    white-space: nowrap;
}

.noscript {
    position: fixed;
    right: 1rem;
    bottom: 1rem;
    left: 1rem;
    margin: 0;
    padding: 1rem;
    border: 2px solid var(--danger);
    background: var(--surface);
    color: var(--text);
    text-align: center;
}

@keyframes marquee {
    from { transform: translateX(100vw); }
    to { transform: translateX(-100%); }
}

@keyframes blink {
    50% { opacity: 0; }
}

@media (min-width: 48rem) {
    .share-grid,
    .learn-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}

@media (forced-colors: active) {
    .hero h1 {
        color: CanvasText;
        -webkit-text-fill-color: CanvasText;
    }
}