/*
    css reset - based on josh comeau's css reset
    https://www.joshwcomeau.com/css/custom-css-reset/
*/

*,
*::before,
*::after {
    box-sizing: border-box;
}

*:not(dialog) {
    margin: 0;
}

/* keyword animation */
@media (prefers-reduced-motion: no-preference) {
    html {
        interpolate-size: allow-keywords;
    }
}

body {
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

img,
picture,
video,
canvas,
svg {
    display: block;
    max-width: 100%;
}

/* inherit fonts for form controls */
input,
button,
textarea,
select {
    font: inherit;
}

/* text overflow handling */
p,
h1,
h2,
h3,
h4,
h5,
h6 {
    overflow-wrap: break-word;
}

p {
    text-wrap: pretty;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    text-wrap: balance;
}

/* design tokens: primitives -> semantics */

:root {
    /* primitives */
    --color-cream-100: #faf8f5;
    --color-cream-200: #f5f0e8;
    --color-brown-800: #3d3a36;
    --color-brown-900: #2a2825;
    --color-accent: #8b7355;

    /* semantics */
    --color-bg: var(--color-cream-100);
    --color-bg-card: var(--color-cream-200);
    --color-text: var(--color-brown-900);
    --color-text-muted: var(--color-brown-800);

    /* spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;

    /* typography */
    --font-body: Georgia, 'Times New Roman', serif;
    --font-heading: Georgia, 'Times New Roman', serif;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-2xl: 1.75rem;
    --font-size-content: clamp(1.125rem, 0.9rem + 1vw, 1.5rem);

    /* effects */
    --radius-sm: 4px;
    --radius-md: 8px;
    --shadow-soft: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-warm: 0 2px 4px rgba(61, 58, 54, 0.05), 0 4px 12px rgba(61, 58, 54, 0.08);
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --content-transition-duration: 200ms;
    --content-transition-easing: ease;

    /* layout */
    --content-min-height: 8rem;
}

/* dark mode */
[data-theme="dark"] {
    --color-bg: var(--color-brown-900);
    --color-bg-card: var(--color-brown-800);
    --color-text: var(--color-cream-100);
    --color-text-muted: var(--color-cream-200);
}

/* base styles */
body {
    min-height: 100vh;
    display: grid;
    grid-template-rows: auto 1fr auto;

    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    line-height: 1.5;
}

/* ===================
   COMPONENTS
   =================== */

/* header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
}

.header__title {
    font-family: var(--font-heading);
    font-size: var(--font-size-2xl);
    font-weight: normal;
    color: var(--color-text);
}

.header__nav {
    display: flex;
    align-items: center;
}

.header__link {
    color: var(--color-accent);
    text-decoration: underline;
    text-decoration-color: rgba(139, 115, 85, 0.25);
    text-underline-offset: 3px;
    text-decoration-thickness: 1px;
    transition: 
        color var(--transition-fast),
        text-decoration-color var(--transition-fast);
}

.header__link:hover,
.header__link:focus {
    color: var(--color-brown-800);
    text-decoration-color: var(--color-brown-800);
}

.header__link:focus-visible {
    outline: 2px solid var(--color-brown-800);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(139, 115, 85, 0.2);
}

/* main */
.main {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-lg);
}

/* joke card */
.joke-card {
    width: 100%;
    max-width: min(65ch, 700px);
    padding: var(--spacing-lg);

    background-color: var(--color-bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-warm);

    text-align: center;
}

.joke-card__text {
    font-size: var(--font-size-content);
    min-height: var(--content-min-height);
    margin-bottom: var(--spacing-lg);
    transition: opacity var(--content-transition-duration) var(--content-transition-easing);
}

.joke-card__text--fading {
    opacity: 0;
}

.joke-card__button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: var(--spacing-sm) var(--spacing-md);

    font-family: inherit;
    font-size: var(--font-size-base);
    font-weight: 500;

    color: var(--color-cream-100);
    background-color: var(--color-accent);
    border: none;
    border-radius: var(--radius-sm);

    cursor: pointer;
    transition:
        background-color var(--transition-fast),
        box-shadow var(--transition-fast),
        transform var(--transition-fast);
}

.joke-card__button:hover {
    background-color: color-mix(in srgb, var(--color-accent) 90%, black);
    box-shadow: 0 2px 8px rgba(139, 115, 85, 0.25);
}

.joke-card__button:active {
    transform: translateY(1px);
    box-shadow: none;
}

.joke-card__button:focus-visible {
    outline: 2px solid var(--color-brown-800);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(139, 115, 85, 0.2);
}

.joke-card__button:disabled {
    cursor: not-allowed;
}

.joke-card__button--loading {
    animation: breathe 2s ease-in-out infinite;
}

@keyframes breathe {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

@media (prefers-reduced-motion: reduce) {
    .joke-card__button--loading {
        animation: none;
    }

    .joke-card__text--fading {
        transition: none;
    }
}

/* footer */
.footer {
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: center;
}

.footer__text {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.footer__link {
    color: var(--color-accent);
    text-decoration: underline;
    text-decoration-color: rgba(139, 115, 85, 0.25);
    text-underline-offset: 3px;
    text-decoration-thickness: 1px;
    transition:
        color var(--transition-fast),
        text-decoration-color var(--transition-fast);
}

.footer__link:hover,
.footer__link:focus {
    color: var(--color-brown-800);
    text-decoration-color: var(--color-brown-800);
}

.footer__link:focus-visible {
    outline: 2px solid var(--color-brown-800);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(139, 115, 85, 0.2);
}