/*
 * Hand-written, custom properties, grid/flexbox. No Tailwind, no preprocessor,
 * no build step (chapter 3.2).
 *
 * CSP has no unsafe-inline, so every visual state lives here as a class -- never
 * as a style attribute in a template.
 */

:root {
    --ink:        #17201c;
    --ink-muted:  #5a6660;
    --paper:      #fbfaf7;
    --panel:      #ffffff;
    --rule:       #dcdfd9;
    --accent:     #1f5d4c;
    --accent-ink: #ffffff;
    --warn:       #8a5a12;

    --gap:      1rem;
    --radius:   4px;
    --measure:  68ch;

    --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", Consolas, monospace;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font: 16px/1.55 var(--font);
}

.masthead {
    display: flex;
    align-items: baseline;
    gap: var(--gap);
    flex-wrap: wrap;
    padding: 0.9rem 1.5rem;
    background: var(--accent);
    color: var(--accent-ink);
}

.masthead__brand {
    color: inherit;
    font-weight: 600;
    font-size: 1.05rem;
    letter-spacing: 0.02em;
    text-decoration: none;
}

.masthead__tagline {
    color: rgba(255, 255, 255, 0.82);
    font-size: 0.85rem;
}

.shell {
    max-width: var(--measure);
    margin: 0 auto;
    padding: 2rem 1.5rem 4rem;
}

h1 {
    margin: 0 0 0.35em;
    font-size: 1.6rem;
    font-weight: 600;
    line-height: 1.2;
}

.lede {
    margin: 0 0 1.75em;
    color: var(--ink-muted);
}

.facts {
    display: grid;
    grid-template-columns: minmax(12rem, auto) 1fr;
    gap: 0.55rem 1.5rem;
    margin: 0 0 2rem;
    padding: 1.1rem 1.25rem;
    background: var(--panel);
    border: 1px solid var(--rule);
    border-radius: var(--radius);
}

.facts dt {
    color: var(--ink-muted);
    font-size: 0.9rem;
}

.facts dd {
    margin: 0;
    font-variant-numeric: tabular-nums;
}

.note {
    color: var(--ink-muted);
    font-size: 0.9rem;
}

.detail {
    overflow-x: auto;
    padding: 0.9rem 1rem;
    background: var(--panel);
    border: 1px solid var(--rule);
    border-radius: var(--radius);
    font: 0.85rem/1.5 var(--mono);
}

@media (max-width: 34rem) {
    .facts { grid-template-columns: 1fr; gap: 0.15rem; }
    .facts dd { margin-bottom: 0.6rem; }
}

@media print {
    .masthead { background: none; color: var(--ink); }
    .shell { max-width: none; }
}

/* ---------------------------------------------------------------- navigation */

.masthead__nav {
    display: flex;
    align-items: baseline;
    gap: 1rem;
    flex-wrap: wrap;
    margin-left: auto;
    font-size: 0.9rem;
}

.masthead__nav a { color: rgba(255, 255, 255, 0.92); }
.masthead__user { color: rgba(255, 255, 255, 0.72); }

/* ---------------------------------------------------------------- forms */

.stack {
    display: grid;
    gap: 0.35rem;
    max-width: 34rem;
    margin: 0 0 2rem;
}

.stack label {
    margin-top: 0.75rem;
    color: var(--ink-muted);
    font-size: 0.9rem;
}

.stack label.checkbox {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--ink);
    font-size: 1rem;
}

input[type="text"], input[type="email"], input[type="password"], input[type="date"],
select, textarea {
    width: 100%;
    padding: 0.5rem 0.6rem;
    border: 1px solid var(--rule);
    border-radius: var(--radius);
    background: var(--panel);
    color: inherit;
    font: inherit;
}

input:focus-visible, select:focus-visible, textarea:focus-visible, button:focus-visible, a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

input[type="checkbox"] { width: auto; }

textarea { resize: vertical; }

button {
    justify-self: start;
    margin-top: 1rem;
    padding: 0.5rem 1.1rem;
    border: 1px solid transparent;
    border-radius: var(--radius);
    background: var(--accent);
    color: var(--accent-ink);
    font: inherit;
    cursor: pointer;
}

button:hover { filter: brightness(1.1); }

.actions {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 1rem;
}

.actions button { margin-top: 0; }

.inline-form { display: inline; }

/* A button that has to look like a link: sign-out and delete sit inside forms,
   because a state-changing action must not be a GET. */
.linkish {
    margin: 0;
    padding: 0;
    border: 0;
    background: none;
    color: inherit;
    font: inherit;
    text-decoration: underline;
    cursor: pointer;
}

.masthead .linkish { color: rgba(255, 255, 255, 0.92); }

/* ---------------------------------------------------------------- feedback */

.flash, .errors {
    margin: 0 0 1.5rem;
    padding: 0.7rem 0.9rem;
    border-left: 3px solid var(--accent);
    border-radius: 0 var(--radius) var(--radius) 0;
    background: var(--panel);
}

.errors {
    border-left-color: var(--warn);
    color: var(--warn);
}

ul.errors { padding-left: 1.9rem; }

/* ---------------------------------------------------------------- tables */

.table-scroll {
    overflow-x: auto;
    margin: 0 0 2rem;
}

.grid {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.94rem;
}

.grid th, .grid td {
    padding: 0.5rem 0.7rem;
    border-bottom: 1px solid var(--rule);
    text-align: left;
    vertical-align: top;
}

.grid th {
    color: var(--ink-muted);
    font-size: 0.85rem;
    font-weight: 600;
}

.grid tbody tr:hover { background: var(--panel); }

/* ---------------------------------------------------------------- pieces */

h2 {
    margin: 2.5rem 0 0.6rem;
    font-size: 1.15rem;
    font-weight: 600;
}

h3 {
    margin: 2rem 0 0.5rem;
    font-size: 1rem;
    font-weight: 600;
}

ul.plain {
    margin: 0 0 1.5rem;
    padding: 0;
    list-style: none;
}

ul.plain li {
    padding: 0.35rem 0;
    border-bottom: 1px solid var(--rule);
}

.chip {
    display: inline-block;
    margin-right: 0.4rem;
    padding: 0.05rem 0.5rem;
    border-radius: 999px;
    background: var(--rule);
    font-size: 0.78rem;
}

.chip--excluded {
    background: #f3e4cd;
    color: var(--warn);
}

.mono { font-family: var(--mono); }
.breakable { overflow-wrap: anywhere; }