/* ---------------------------------------------------------------------
   Reset
--------------------------------------------------------------------- */

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

html {
    scroll-behavior: smooth;
}

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

body,
h1,
h2,
h3,
h4,
p,
ul,
ol,
figure {
    margin: 0;
}

ul,
ol {
    padding: 0;
    list-style: none;
}

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

a {
    color: inherit;
    text-decoration: none;
}

button {
    font: inherit;
    color: inherit;
    background: none;
    border: 0;
    cursor: pointer;
}

svg {
    width: 1em;
    height: 1em;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
}


/* ---------------------------------------------------------------------
   Base
--------------------------------------------------------------------- */

body {
    font-family: var(--font-base);
    color: var(--color-ink);
    background: var(--color-paper);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    padding-top: calc(var(--topbar-height) + var(--header-height));
}

h1,
h2,
h3,
h4 {
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.01em;
}

h1 {
    font-size: clamp(2rem, 1.4rem + 2.4vw, 3.25rem);
}

h2 {
    font-size: clamp(1.6rem, 1.3rem + 1.2vw, 2.25rem);
}

h3 {
    font-size: 1.25rem;
}

p {
    color: #4a534a;
}

.container {
    width: 100%;
    max-width: var(--container-width);
    margin-inline: auto;
    padding-inline: 1.25rem;
}


/* Generic vertical section spacing — used across every page */

.section {
    padding-block: 4.5rem;
}

.section--alt {
    background: var(--color-paper-alt);
}

.section__head {
    max-width: 620px;
    margin-bottom: 2.5rem;
}


/* Visible focus state for every interactive element — accessibility floor */

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}


/* Skip link — hidden until keyboard-focused */

.skip-link {
    position: absolute;
    left: -999px;
    top: 0;
    background: var(--color-accent);
    color: var(--color-ink);
    font-weight: 700;
    padding: 0.6rem 1rem;
    z-index: 200;
}

.skip-link:focus {
    left: 0.5rem;
    top: 0.5rem;
}


/* ---------------------------------------------------------------------
   Buttons
--------------------------------------------------------------------- */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.7rem 1.4rem;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 0.95rem;
    white-space: nowrap;
    transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.btn--accent {
    background: var(--color-accent);
    color: var(--color-white);
}

.btn--accent:hover {
    background: var(--color-accent-dark);
}

.btn--outline {
    background: transparent;
    border: 1.5px solid var(--color-line);
    color: var(--color-primary);
}

.btn--outline:hover {
    border-color: var(--color-primary);
    background: var(--color-paper-alt);
}

.btn:active {
    transform: translateY(1px);
}