/* ============================================================================
   Sommer Systems — main.css
   Hand-coded, dependency-free. All design lives here.
   Sections: tokens · reset · layout · header · buttons · hero · what ·
             ventures · infra · principles · about · contact · footer ·
             pages · reveal · responsive
   ========================================================================== */

/* ---------- Tokens ---------- */
:root {
  --ink:       #101b21;
  --ink-2:     #17262c;
  --paper:     #f4f7f7;
  --paper-2:   #e8f0ef;
  --blue:      #1d6fa5;
  --blue-deep: #154f79;
  --pine:      #1f5c4d;
  --pine-2:    #28705e;
  --stone:     #6e7c7c;

  --maxw:        1180px;
  --pad-section: clamp(4.5rem, 9vw, 8rem);
  --radius:      10px;
  --ease:        cubic-bezier(.2, .7, .2, 1);

  --ff-display: 'Fraunces', 'Iowan Old Style', Georgia, 'Times New Roman', serif;
  --ff-sans:    'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;

  /* Themeable slots — light band defaults */
  --bg:            var(--paper);
  --fg:            #101b21;
  --fg-dim:        #4d5e60;
  --line:          rgba(16, 27, 33, .13);
  --card:          #fdfffe;
  --accent:        var(--blue);
  --accent-strong: var(--blue-deep);
  --btn-ghost-bd:  rgba(16, 27, 33, .28);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--ff-sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; border-radius: 2px; }
::selection { background: var(--blue); color: var(--paper); }

/* ---------- Layout ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: clamp(1.25rem, 5vw, 3rem); }

.band { background: var(--bg); color: var(--fg); }
.band--paper2 { --bg: var(--paper-2); --card: #eef6f5; }
.band--ink {
  --bg: var(--ink); --fg: #f4f7f7; --fg-dim: rgba(244, 247, 247, .66);
  --line: rgba(244, 247, 247, .16); --card: #1c2c33;
  --accent-strong: #5fa8d3; --btn-ghost-bd: rgba(244, 247, 247, .34);
}
.band--pine {
  --bg: var(--pine); --fg: #f1f7f5; --fg-dim: rgba(241, 247, 245, .72);
  --line: rgba(241, 247, 245, .18); --card: #276050;
  --accent-strong: #7cc3e8; --btn-ghost-bd: rgba(241, 247, 245, .38);
}
.section { padding-block: var(--pad-section); }

.eyebrow {
  display: inline-flex; align-items: center; gap: .6rem;
  font-size: .72rem; font-weight: 600; letter-spacing: .16em;
  text-transform: uppercase; color: var(--fg-dim);
}
.eyebrow::before { content: ""; width: 1.6rem; height: 1px; background: var(--accent); }
.band--ink .eyebrow, .band--pine .eyebrow { color: var(--accent-strong); }

.section-title {
  font-family: var(--ff-display);
  font-weight: 400;
  font-size: clamp(2rem, 4.2vw, 3rem);
  line-height: 1.08;
  letter-spacing: -.018em;
  margin-top: 1rem;
}
.section-title em { font-style: normal; color: var(--accent-strong); }
.lead {
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  color: var(--fg-dim);
  max-width: 46ch;
  margin-top: 1.1rem;
}

/* ---------- Header ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1.5rem;
  padding: .85rem clamp(1.25rem, 5vw, 3rem);
  background: rgba(244, 247, 247, .82);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  transition: transform .35s var(--ease);
}
.brand { display: inline-flex; align-items: center; gap: .6rem; color: var(--ink); }
.brand__mark { width: 34px; height: 34px; flex: none; color: var(--ink); }
.brand__mark .ray { stroke: currentColor; }
.brand__mark .arc { stroke: var(--blue); }
.brand__mark .node { fill: var(--blue); }
.brand__word {
  font-family: var(--ff-display);
  font-size: 1.15rem; font-weight: 500; letter-spacing: -.01em; line-height: 1;
}
.brand__word b { font-weight: 400; }
.brand__word span { font-family: var(--ff-sans); font-weight: 500; color: var(--stone); }

.primary-nav ul { display: flex; align-items: center; gap: clamp(1.25rem, 3vw, 2.4rem); }
.primary-nav a {
  font-size: .82rem; font-weight: 500; letter-spacing: .02em; color: var(--fg-dim);
  transition: color .2s;
}
.primary-nav a:hover, .primary-nav a.active { color: var(--ink); }
.primary-nav .nav-cta {
  padding: .55rem 1.15rem; background: var(--blue); color: var(--paper);
  border-radius: 7px; font-weight: 600;
}
.primary-nav .nav-cta:hover { background: var(--blue-deep); color: var(--paper); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; width: 30px; height: 22px; padding: 3px; }
.nav-toggle span { display: block; height: 2px; width: 100%; background: var(--ink); border-radius: 2px; transition: transform .3s, opacity .2s; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .55rem;
  padding: .9rem 1.6rem; border-radius: 8px;
  font-family: var(--ff-sans); font-weight: 600; font-size: .92rem; letter-spacing: .01em;
  border: 1px solid transparent;
  transition: background .2s, color .2s, border-color .2s, transform .2s var(--ease);
}
.btn svg { width: 1em; height: 1em; }
.btn--primary { background: var(--blue); color: var(--paper); border-color: var(--blue); }
.btn--primary:hover { background: var(--blue-deep); border-color: var(--blue-deep); color: var(--paper); transform: translateY(-2px); }
.btn--ghost { color: var(--fg); border-color: var(--btn-ghost-bd); }
.btn--ghost:hover { border-color: currentColor; transform: translateY(-2px); }

.arrow-link {
  display: inline-flex; align-items: center; gap: .4rem;
  font-weight: 600; font-size: .92rem; color: var(--fg);
}
.arrow-link svg { width: .85rem; height: .85rem; transition: transform .2s var(--ease); }
.arrow-link:hover svg { transform: translate(3px, -3px); }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding-top: clamp(9rem, 18vh, 12rem); padding-bottom: var(--pad-section); }
.hero__rays {
  position: absolute; right: -14vw; top: -12vw; width: min(60vw, 620px); height: min(60vw, 620px);
  color: var(--blue); opacity: .14; pointer-events: none;
}
.hero__inner { position: relative; max-width: 60ch; }
.hero__eyebrow { margin-bottom: 1.6rem; }
.hero h1 {
  font-family: var(--ff-display);
  font-weight: 400;
  font-size: clamp(2.9rem, 8vw, 5rem);
  line-height: 1.02; letter-spacing: -.025em;
}
.hero h1 .tail { color: var(--stone); }
.hero__sub { font-size: clamp(1.1rem, 2vw, 1.4rem); color: var(--fg-dim); margin-top: 1.4rem; max-width: 42ch; }
.hero__actions { display: flex; flex-wrap: wrap; gap: .9rem; margin-top: 2.2rem; }
.hero__ventures {
  margin-top: 3.5rem; padding-top: 1.5rem; border-top: 1px solid var(--line);
  display: flex; flex-wrap: wrap; align-items: center; gap: .5rem 1.4rem;
  font-size: .84rem; color: var(--fg-dim);
}
.hero__ventures span:first-child { font-weight: 600; color: var(--ink); letter-spacing: .1em; text-transform: uppercase; font-size: .7rem; }
.hero__ventures i { font-style: normal; }
.hero__ventures i + i::before { content: "·"; margin-right: 1.4rem; color: var(--stone); }

/* ---------- What we do ---------- */
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; margin-top: 3rem; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.card {
  background: var(--bg); padding: 1.9rem 1.6rem 2.1rem;
  display: flex; flex-direction: column; gap: .7rem;
  transition: background .25s;
}
.card:hover { background: var(--card); }
.card__num { font-family: var(--ff-display); font-size: .95rem; color: var(--accent-strong); }
.card__title { font-family: var(--ff-display); font-size: 1.3rem; font-weight: 500; line-height: 1.2; }
.card__body { font-size: .93rem; color: var(--fg-dim); }

/* ---------- Ventures ---------- */
.ventures__head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: end; gap: 1.5rem; }
.venture-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: 3rem; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.venture {
  background: var(--bg); padding: 1.7rem 1.5rem; display: flex; flex-direction: column; gap: .5rem;
  transition: background .25s;
}
.venture:hover { background: var(--card); }
.venture__name { font-family: var(--ff-display); font-size: 1.25rem; font-weight: 500; }
.venture__desc { font-size: .9rem; color: var(--fg-dim); flex: 1; }
.venture__link { font-size: .78rem; letter-spacing: .06em; text-transform: uppercase; color: var(--accent-strong); display: inline-flex; align-items: center; gap: .35rem; }
.venture__link svg { width: .75rem; height: .75rem; transition: transform .2s var(--ease); }
.venture:hover .venture__link svg { transform: translate(3px, -3px); }
.venture--soon { opacity: .6; }
.venture__link--soon { color: var(--fg-dim); }

.clients { margin-top: 2.6rem; padding-top: 1.6rem; border-top: 1px solid var(--line); }
.clients b { font-size: .7rem; letter-spacing: .12em; text-transform: uppercase; color: var(--fg-dim); font-weight: 600; }
.clients__list { margin-top: 1rem; display: flex; flex-direction: column; gap: .55rem; }
.clients__list li { font-size: .92rem; color: var(--fg-dim); }
.clients__list a { color: var(--fg); font-weight: 600; }
.clients__list a:hover { color: var(--accent-strong); }

/* ---------- Infrastructure ---------- */
.infra__grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: clamp(2rem, 6vw, 5rem); margin-top: 2.6rem; align-items: start; }
.infra__prose p { color: var(--fg-dim); margin-top: 1rem; max-width: 46ch; }
.infra__prose p:first-child { margin-top: 0; }
.stack { border-top: 1px solid var(--line); }
.stack__row { display: grid; grid-template-columns: auto 1fr; gap: 1rem; padding: 1rem 0; border-bottom: 1px solid var(--line); align-items: baseline; }
.stack__row dt { font-family: var(--ff-display); font-size: 1.05rem; }
.stack__row dd { font-size: .88rem; color: var(--fg-dim); }
.stack__row .tag { font-size: .68rem; letter-spacing: .1em; text-transform: uppercase; color: var(--accent-strong); }

/* ---------- Principles ---------- */
.principles { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; margin-top: 3rem; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.principle { background: var(--bg); padding: 1.8rem 1.4rem; }
.principle__n { font-family: var(--ff-display); font-size: 1.8rem; color: var(--accent-strong); line-height: 1; }
.principle__t { font-weight: 600; margin-top: .9rem; }
.principle__d { font-size: .88rem; color: var(--fg-dim); margin-top: .4rem; }

/* ---------- About / people ---------- */
.people { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 6vw, 4rem); margin-top: 3rem; }
.person { border-top: 2px solid var(--accent); padding-top: 1.4rem; }
.person__name { font-family: var(--ff-display); font-size: 1.6rem; font-weight: 500; }
.person__role { font-size: .8rem; letter-spacing: .1em; text-transform: uppercase; color: var(--fg-dim); margin-top: .3rem; }
.person__bio { color: var(--fg-dim); margin-top: 1rem; font-size: .96rem; }
.person__links { display: flex; gap: 1.2rem; margin-top: 1.1rem; }
.person__links a { font-size: .82rem; font-weight: 600; color: var(--accent-strong); display: inline-flex; align-items: center; gap: .35rem; }
.person__links svg { width: .8rem; height: .8rem; }
.about__story { margin-top: 3rem; padding-top: 1.6rem; border-top: 1px solid var(--line); color: var(--fg-dim); max-width: 68ch; }

/* ---------- Contact ---------- */
.contact__grid { display: grid; grid-template-columns: .95fr 1.05fr; gap: clamp(2rem, 6vw, 4.5rem); margin-top: 1rem; align-items: start; }
.contact__links { display: flex; flex-direction: column; gap: .8rem; margin-top: 1.8rem; }
.contact__link { display: inline-flex; align-items: center; gap: .6rem; font-weight: 500; }
.contact__link:hover { color: var(--accent-strong); }
.contact__meta { margin-top: 2rem; font-size: .84rem; color: var(--fg-dim); }

.contact-form { display: grid; gap: 1.1rem; }
.form-row { display: grid; gap: 1.1rem; grid-template-columns: 1fr 1fr; }
.form-group { display: flex; flex-direction: column; gap: .4rem; }
.form-group label { font-size: .78rem; letter-spacing: .06em; text-transform: uppercase; color: var(--fg-dim); }
.form-group input, .form-group textarea {
  font: inherit; color: var(--fg);
  background: rgba(255, 255, 255, .04);
  border: 1px solid var(--line); border-radius: 8px;
  padding: .8rem .9rem;
  transition: border-color .2s, background .2s;
}
.band--ink .form-group input, .band--ink .form-group textarea { background: rgba(244, 247, 247, .05); }
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--blue); background: rgba(255, 255, 255, .07); }
.form-group textarea { min-height: 140px; resize: vertical; }
.form-hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-notice { padding: .85rem 1rem; border-radius: 8px; font-size: .9rem; }
.form-notice--ok { background: rgba(31, 92, 77, .2); border: 1px solid rgba(31, 92, 77, .55); }
.form-notice--err { background: rgba(190, 80, 60, .16); border: 1px solid rgba(190, 80, 60, .5); }

/* ---------- Footer ---------- */
.site-footer { background: var(--ink); color: rgba(244, 247, 247, .7); padding-block: clamp(3.5rem, 7vw, 5rem) 2rem; }
.footer__top { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 2rem; }
.footer__brand .brand { color: var(--paper); }
.footer__brand .brand__mark { color: var(--paper); }
.footer__tag { margin-top: 1rem; font-size: .88rem; max-width: 30ch; }
.footer__col h4 { font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; color: rgba(244, 247, 247, .5); margin-bottom: .9rem; }
.footer__col a { display: block; padding: .28rem 0; font-size: .9rem; color: rgba(244, 247, 247, .8); }
.footer__col a:hover { color: #5fa8d3; }
.footer__bar {
  margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid rgba(244, 247, 247, .14);
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: .6rem 1.5rem;
  font-size: .8rem; color: rgba(244, 247, 247, .5);
}
.footer__bar a:hover { color: #5fa8d3; }

/* ---------- Legal / generic pages ---------- */
.page-shell { padding-top: clamp(8rem, 16vh, 11rem); padding-bottom: var(--pad-section); }
.page-shell .wrap { max-width: 760px; }
.page-shell h1 { font-family: var(--ff-display); font-weight: 400; font-size: clamp(2.2rem, 5vw, 3.2rem); letter-spacing: -.02em; }
.page-content { margin-top: 2rem; }
.page-content h2 { font-family: var(--ff-display); font-weight: 500; font-size: 1.4rem; margin-top: 2.4rem; }
.page-content h3 { font-size: 1.05rem; margin-top: 1.8rem; }
.page-content p, .page-content li { color: var(--fg-dim); margin-top: 1rem; }
.page-content ul { padding-left: 1.2rem; list-style: disc; }
.page-content a { color: var(--blue-deep); text-decoration: underline; text-underline-offset: 3px; }

/* ---------- Reveal ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1000px) {
  .cards, .principles { grid-template-columns: repeat(2, 1fr); }
  .venture-grid { grid-template-columns: repeat(2, 1fr); }
  .infra__grid, .contact__grid, .people { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .nav-toggle { display: flex; }
  .primary-nav {
    position: fixed; inset: 0 0 0 auto; width: min(78vw, 320px);
    background: var(--paper); border-left: 1px solid var(--line);
    padding: 5.5rem 2rem 2rem; transform: translateX(100%);
    transition: transform .35s var(--ease);
  }
  .primary-nav.open { transform: none; }
  .primary-nav ul { flex-direction: column; align-items: flex-start; gap: 1.4rem; }
  .primary-nav a { font-size: 1rem; }
  .cards, .venture-grid, .principles { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer__top { grid-template-columns: 1fr 1fr; }
  .footer__brand { grid-column: 1 / -1; }
  .hero__ventures i + i::before { content: ""; margin: 0; }
}