/*
   Cygnus Services – scientific ML consulting
   Restrained, editorial, light. Deliberately unlike hopdoctor.com.
*/

:root {
    color-scheme: light;

    --ink: #1c1e22;
    --ink-soft: #4b5058;
    --ink-faint: #8a8f98;
    --paper: #fbfaf7;
    --paper-raised: #ffffff;
    --rule: #e3e1da;
    --accent: #135e5e;
    --accent-ink: #0e4a4a;

    --serif: 'Newsreader', Georgia, serif;
    --sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    --container: 960px;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--sans);
    background: var(--paper);
    color: var(--ink);
    line-height: 1.65;
    font-size: 1.0625rem;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
}

a { color: var(--accent-ink); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { font-family: var(--serif); font-weight: 600; letter-spacing: -0.01em; }

/* Masthead */
.masthead {
    border-bottom: 1px solid var(--rule);
    background: var(--paper);
}

.masthead .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.wordmark {
    font-family: var(--serif);
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: 0.01em;
}

.masthead-nav { display: flex; gap: 28px; font-size: 0.92rem; }
.masthead-nav a { color: var(--ink-soft); }
.masthead-nav a:hover { color: var(--ink); text-decoration: none; }
.masthead-contact { color: var(--accent-ink) !important; font-weight: 500; }

@media (max-width: 640px) {
    .masthead-nav a:not(.masthead-contact) { display: none; }
}

/* Hero */
.hero { padding: 96px 0 72px; }

.hero h1 {
    font-size: 3rem;
    line-height: 1.12;
    max-width: 700px;
}

@media (max-width: 640px) {
    .hero { padding: 64px 0 48px; }
    .hero h1 { font-size: 2.1rem; }
}

.hero-byline {
    margin-top: 18px;
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent-ink);
}

.hero-lede {
    margin-top: 18px;
    max-width: 620px;
    font-size: 1.15rem;
    color: var(--ink-soft);
}

.hero-cta { margin-top: 36px; display: flex; gap: 16px; flex-wrap: wrap; }

.btn {
    display: inline-block;
    padding: 12px 22px;
    border-radius: 6px;
    font-size: 0.97rem;
    font-weight: 500;
    font-family: inherit;
    border: none;
    cursor: pointer;
}

.btn:hover { text-decoration: none; }

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

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

.btn-plain {
    color: var(--ink-soft);
    border: 1px solid var(--rule);
    background: var(--paper-raised);
}

.btn-plain:hover { color: var(--ink); border-color: var(--ink-faint); }

/* Pillars */
.pillars { padding: 56px 0 72px; border-top: 1px solid var(--rule); }

.pillar-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

@media (max-width: 800px) {
    .pillar-grid { grid-template-columns: 1fr; gap: 36px; }
}

.pillar-num {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--ink-faint);
    letter-spacing: 0.06em;
}

.pillar h2 { font-size: 1.6rem; margin-top: 6px; }

.pillar-tag {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--accent-ink);
    margin: 4px 0 10px;
}

.pillar p:last-child { color: var(--ink-soft); font-size: 0.98rem; }

/* Fixed-scope offers */
.offer { padding: 24px 0 72px; }

.offer-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
}

@media (max-width: 800px) {
    .offer-grid { grid-template-columns: 1fr; }
}

.offer-card {
    background: var(--paper-raised);
    border: 1px solid var(--rule);
    border-radius: 10px;
    padding: 36px 40px;
    box-shadow: 0 1px 3px rgba(28, 30, 34, 0.04);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.offer-card .btn { margin-top: auto; }

@media (max-width: 640px) {
    .offer-card { padding: 32px 24px; }
}

.offer-eyebrow {
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ink-faint);
}

.offer-card h2 { font-size: 1.9rem; margin: 8px 0 12px; }

.offer-card > p:nth-of-type(2) { max-width: 640px; color: var(--ink-soft); margin-bottom: 24px; }

.offer-alt { margin-top: 20px; font-size: 0.95rem; color: var(--ink-soft); }

/* Work */
.work { padding: 56px 0; border-top: 1px solid var(--rule); }

.section-heading { font-size: 2rem; margin-bottom: 32px; }

.work-item { max-width: 720px; margin-bottom: 32px; }

.work-item h3 { font-size: 1.35rem; margin-bottom: 8px; }

.work-item p { color: var(--ink-soft); font-size: 0.99rem; }

/* Credentials */
.credentials { padding: 48px 0; border-top: 1px solid var(--rule); }

.cred-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 48px;
}

@media (max-width: 700px) {
    .cred-grid { grid-template-columns: 1fr; gap: 32px; }
}

.cred-col h4 {
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ink-faint);
    margin-bottom: 14px;
}

.cred-col p { font-size: 0.95rem; color: var(--ink-soft); margin-bottom: 12px; }

.cite { color: var(--ink-faint); white-space: nowrap; }

/* Contact */
.contact { padding: 56px 0 72px; border-top: 1px solid var(--rule); }

.contact-lede { color: var(--ink-soft); margin-bottom: 28px; }

.contact-alt { margin-top: 24px; font-size: 0.95rem; color: var(--ink-soft); }

/* Forms */
.contact-form { max-width: 560px; }

.contact-form h3 {
    font-size: 1.4rem;
    margin-bottom: 20px;
    padding-right: 32px;
}

.contact-form label {
    display: block;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--ink-soft);
    margin-bottom: 16px;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
    display: block;
    width: 100%;
    margin-top: 6px;
    padding: 10px 12px;
    font: inherit;
    font-size: 0.97rem;
    color: var(--ink);
    background: var(--paper-raised);
    border: 1px solid var(--rule);
    border-radius: 6px;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.contact-form textarea { resize: vertical; }

.contact-form .btn { border: none; cursor: pointer; margin-top: 4px; }

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

@media (max-width: 560px) {
    .form-row { grid-template-columns: 1fr; }
}

.hp-field { display: none; }

/* Engagement dialog */
#engage-dialog {
    border: 1px solid var(--rule);
    border-radius: 12px;
    padding: 36px 40px;
    width: min(600px, calc(100vw - 48px));
    background: var(--paper);
    color: var(--ink);
}

#engage-dialog::backdrop {
    background: rgba(28, 30, 34, 0.45);
}

@media (max-width: 560px) {
    #engage-dialog { padding: 28px 20px; }
}

#engage-dialog .contact-form { max-width: none; }

.dialog-close {
    position: absolute;
    top: 14px;
    right: 16px;
    font-size: 1.5rem;
    line-height: 1;
    color: var(--ink-faint);
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
}

.dialog-close:hover { color: var(--ink); }

/* Footer */
.footer { border-top: 1px solid var(--rule); padding: 24px 0 40px; }

.footer .container {
    display: flex;
    justify-content: space-between;
    font-size: 0.88rem;
    color: var(--ink-faint);
}

.footer a { color: var(--ink-faint); }
.footer a:hover { color: var(--ink-soft); }