/* White Cairn — Mono B5: B4 header + B3 feature cards + more section spacing */

:root {
    --text: #181d2a;
    --text-light: #555b6e;
    --bg: #fff;
    --bg-alt: #f0f1f5;
    --accent: #1c2438;
    --accent-mid: #3a4562;
    --border: #c2c7d4;
    --green: #1c2438;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.65;
    font-size: 15.5px;
}

.container {
    max-width: 880px;
    margin: 0 auto;
    padding: 0 28px;
}

/* Header */
header {
    background: var(--accent);
    padding: 20px 0;
    border-bottom: 3px solid var(--accent-mid);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

header h1 {
    font-size: 1.2em;
    font-weight: 700;
    letter-spacing: 5px;
    text-transform: uppercase;
    color: #fff;
}

.tagline {
    font-size: 0.78em;
    color: rgba(255,255,255,0.45);
    margin-top: 2px;
    letter-spacing: 0.5px;
}

nav {
    display: flex;
    gap: 22px;
    flex-wrap: wrap;
}

header nav a,
header nav a:link,
header nav a:visited {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    font-size: 0.82em;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    transition: color 0.15s;
}

header nav a:hover,
header nav a.active {
    color: #fff;
}

header a,
header a:link,
header a:visited {
    color: inherit;
    text-decoration: none;
}

/* Main sections */
main section {
    padding: 80px 28px 48px;
    border-bottom: 1px solid var(--border);
}

main section:last-child {
    border-bottom: none;
}

h2 {
    font-size: 1em;
    margin-top: 10px;
    margin-bottom: 24px;
    color: var(--accent);
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    padding-top: 10px;
}

h3 {
    font-size: 1.05em;
    margin: 20px 0 8px;
    color: var(--text);
    font-weight: 600;
}

h4 {
    font-size: 1em;
    margin: 16px 0 6px;
    color: var(--text-light);
}

p {
    margin-bottom: 12px;
    color: var(--text);
}

.r3-logo {
    height: 1.4em;
    vertical-align: middle;
    margin-right: 10px;
}

/* Feature grid — B3 style cards with top accent bar */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    margin-top: 24px;
}

.feature {
    background: var(--bg);
    padding: 20px 22px;
    border-radius: 0;
    border: 1px solid var(--border);
    border-top: 3px solid var(--accent);
}

.feature h3 {
    margin-top: 0;
    color: var(--accent);
    font-size: 0.88em;
    font-weight: 700;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    margin-bottom: 10px;
}

.feature p {
    font-size: 0.88em;
    color: var(--text-light);
    margin-bottom: 0;
    line-height: 1.6;
}

/* Table */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 0.9em;
}

th, td {
    padding: 9px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    background: var(--bg-alt);
    font-weight: 700;
    color: var(--accent);
    font-size: 0.78em;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    border-bottom: 2px solid var(--accent);
}

.yes {
    color: var(--accent);
    font-weight: 700;
    text-align: center;
}

.no {
    color: #bfc3cc;
    text-align: center;
}

.note {
    font-size: 0.85em;
    color: var(--text-light);
    margin-top: 12px;
}

/* Download */
.download-box {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.download-item {
    background: var(--bg);
    border: 1px solid var(--border);
    border-top: 3px solid var(--accent);
    border-radius: 0;
    padding: 24px;
    text-align: center;
}

.download-item h3 {
    margin: 0 0 4px;
    color: var(--accent);
}

.download-item p {
    font-size: 0.9em;
    color: var(--text-light);
    margin-bottom: 16px;
}

.btn {
    display: inline-block;
    background: var(--accent);
    color: #fff;
    padding: 9px 26px;
    border-radius: 0;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.82em;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    transition: background 0.15s;
}

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

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

.btn-outline:hover {
    background: var(--accent);
    color: #fff;
}

.version {
    display: block;
    margin-top: 10px;
    font-size: 0.85em;
    color: var(--text-light);
}

ol, ul {
    margin: 8px 0 16px 24px;
}

li {
    margin: 4px 0;
}

/* Changelog */
.release {
    margin-bottom: 32px;
}

.release h3 {
    border-bottom: 1px solid var(--border);
    padding-bottom: 6px;
}

.release ul {
    font-size: 0.95em;
}

.release code {
    background: var(--bg-alt);
    padding: 1px 5px;
    border-radius: 0;
    font-size: 0.9em;
}

/* Contact */
.contact-list {
    list-style: none;
    margin-left: 0;
}

.contact-list li {
    margin: 6px 0;
}

.contact-list a {
    color: var(--accent);
    text-decoration: underline;
}

/* Trial request form */
.trial-form-wrap {
    max-width: 560px;
    margin: 24px 0 0;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 16px;
}

.form-row .form-group {
    margin-bottom: 0;
}

.form-group label {
    font-size: 0.8em;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--text-light);
    margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
    font-family: inherit;
    font-size: 0.9em;
    padding: 9px 12px;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    outline: none;
    transition: border-color 0.15s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--accent);
}

.form-group textarea {
    resize: vertical;
}

@media (max-width: 600px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* Footer */
footer {
    background: var(--accent);
    border-top: 3px solid var(--accent-mid);
    padding: 18px 0;
    text-align: center;
}

footer p {
    font-size: 0.78em;
    color: rgba(255,255,255,0.4);
    margin: 0;
}

/* Mobile */
@media (max-width: 600px) {
    header .container {
        flex-direction: column;
        text-align: center;
    }

    nav {
        justify-content: center;
    }

    .feature-grid,
    .download-box {
        grid-template-columns: 1fr;
    }
}