/* AeroOpt site v2 — flat, warm, text-first
 *
 * Дизайн-правила:
 *   - без градиентов, теней, blur, анимаций
 *   - без скруглений углов
 *   - без emoji, иконок-библиотек, декора
 *   - 2 цвета: чернила + терракота
 *   - узкая колонка, как статья
 */

:root {
    --bg: #F4F1EC;
    --ink: #1A1A1A;
    --ink-2: #4A4A4A;
    --rule: #D9D3C7;
    --accent: #C75D2C;
    --muted: #8A857C;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui,
                 Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 17px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

main {
    max-width: 720px;
    margin: 0 auto;
    padding: 48px 24px 80px;
}

hr {
    border: 0;
    border-top: 1px solid var(--rule);
    margin: 48px 0;
}

/* Headings — system serif, no thin weights */
h1, h2, h3 {
    font-family: Georgia, "Iowan Old Style", "Palatino Linotype",
                 "Times New Roman", serif;
    font-weight: 600;
    line-height: 1.25;
    margin: 0 0 16px;
    color: var(--ink);
}

h1 {
    font-size: 42px;
    margin-top: 0;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 26px;
    margin-top: 0;
    margin-bottom: 24px;
}

h3 { font-size: 20px; }

p {
    margin: 0 0 16px;
}

a {
    color: var(--accent);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
}

a:hover { text-decoration-thickness: 2px; }

/* Ссылка на скачивание — чуть заметнее, без иконок */
a.dl-link {
    color: var(--ink);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    font-weight: 500;
}

a.dl-link::before {
    content: "↓ ";
    color: var(--accent);
    text-decoration: none;
    display: inline-block;
    margin-right: 2px;
}

a.dl-link:hover { text-decoration-thickness: 2px; }

strong, b { font-weight: 600; }

em, i { font-style: italic; }

code, kbd, samp {
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    font-size: 0.92em;
    background: rgba(0, 0, 0, 0.04);
    padding: 1px 5px;
    border-radius: 0;
}

pre {
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    font-size: 14px;
    line-height: 1.55;
    background: rgba(0, 0, 0, 0.04);
    border: 1px solid var(--rule);
    padding: 16px;
    overflow-x: auto;
    border-radius: 0;
}

pre code {
    background: transparent;
    padding: 0;
}

/* Header */
header {
    margin-bottom: 24px;
}

header h1 {
    margin: 0;
}

.subtitle {
    font-size: 18px;
    color: var(--ink-2);
    margin-top: 4px;
}

/* Top nav — text links, no buttons */
.topnav {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 32px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--rule);
    font-size: 15px;
}

.topnav a {
    color: var(--ink);
    text-decoration: none;
}

.topnav a:hover {
    color: var(--accent);
    text-decoration: underline;
}

/* Lists */
ol.features, ul.downloads, ul.contact {
    list-style: none;
    padding: 0;
    margin: 0 0 16px;
}

ol.features li {
    margin-bottom: 20px;
    padding-left: 32px;
    position: relative;
    counter-increment: feature;
}

ol.features li::before {
    content: counter(feature, decimal-leading-zero);
    position: absolute;
    left: 0;
    top: 0;
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    font-size: 14px;
    color: var(--muted);
    font-weight: 400;
}

ol.features li strong {
    display: block;
    margin-bottom: 2px;
    color: var(--ink);
}

ul.downloads li {
    margin-bottom: 16px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--rule);
}

ul.downloads li:last-child { border-bottom: 0; }

ul.contact {
    margin: 0;
}

ul.contact li {
    margin-bottom: 6px;
}

/* Pricing table */
table.pricing {
    width: 100%;
    border-collapse: collapse;
    margin: 0 0 24px;
    font-size: 15px;
}

table.pricing th,
table.pricing td {
    text-align: left;
    padding: 12px 8px;
    border-bottom: 1px solid var(--rule);
    vertical-align: top;
}

table.pricing thead th {
    font-weight: 600;
    border-bottom: 2px solid var(--ink);
    color: var(--ink);
}

table.pricing tbody td:first-child {
    color: var(--ink-2);
    font-weight: 500;
}

table.pricing td .btn {
    display: inline-block;
    margin-top: 4px;
}

/* Definition list (requirements) */
dl {
    margin: 0 0 16px;
}

dt {
    font-weight: 600;
    margin-top: 12px;
    color: var(--ink);
}

dt:first-child { margin-top: 0; }

dd {
    margin: 2px 0 0 0;
    color: var(--ink-2);
}

/* Buttons — flat, rectangular, no shadows, no radius, no hover animation */
.btn {
    display: inline-block;
    padding: 8px 16px;
    background: var(--ink);
    color: var(--bg);
    text-decoration: none;
    border: 1px solid var(--ink);
    font-size: 14px;
    font-weight: 500;
    border-radius: 0;
    transition: none;
}

.btn:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--bg);
    text-decoration: none;
}

.btn-secondary {
    background: transparent;
    color: var(--ink);
}

.btn-secondary:hover {
    background: var(--ink);
    color: var(--bg);
}

/* Note / disclaimer text */
.note {
    color: var(--ink-2);
    font-size: 15px;
    border-left: 2px solid var(--rule);
    padding-left: 14px;
    margin-top: 16px;
}

.note strong { color: var(--ink); }

/* Footer */
footer {
    color: var(--muted);
    font-size: 14px;
}

footer a {
    color: var(--ink-2);
}

.copyright {
    margin-top: 12px;
    font-size: 13px;
}

/* Mobile */
@media (max-width: 600px) {
    main { padding: 32px 20px 60px; }
    h1 { font-size: 34px; }
    h2 { font-size: 22px; }
    .subtitle { font-size: 16px; }
    .topnav { gap: 14px; font-size: 14px; }
    body { font-size: 16px; }
    table.pricing { font-size: 14px; }
    table.pricing th, table.pricing td { padding: 8px 6px; }
}

/* Print — clean reading */
@media print {
    .topnav, .btn { display: none; }
    body { background: white; color: black; }
    hr { border-top-color: #999; }
}

/* Focus visible — accessibility, no decoration */
*:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}