/* ============================================================
   Stamford Software — landing page styles
   ============================================================ */

:root {
  /* Base colors */
  --bg: #070b14;
  --bg-rgb: 7 11 20;
  --bg-alt: #0b1120;
  --bg-alt-rgb: 11 17 32;
  --surface: #0f1830;
  --text: #e8edf7;
  --muted: #9aa7c0;
  --muted-dim: #76849f;

  /* Borders + glass fills */
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);
  --glass: rgba(255, 255, 255, 0.04);
  --glass-hover: rgba(255, 255, 255, 0.08);

  /* Accent + tints */
  --accent: #5b8cff;
  --accent-tint: rgba(91, 140, 255, 0.12);
  --accent-tint-border: rgba(91, 140, 255, 0.28);
  --grad: linear-gradient(120deg, #5b8cff 0%, #38bdf8 100%);
  --ok: #34d399;
  --ok-tint: rgba(52, 211, 153, 0.15);
  --ok-tint-border: rgba(52, 211, 153, 0.4);

  /* Radii */
  --radius: 16px;
  --radius-sm: 10px;
  --radius-icon: 13px;
  --radius-xs: 6px;
  --radius-2xs: 4px;

  /* Layout + spacing */
  --nav-h: 74px;
  --space-sm: 14px;
  --space-md: 24px;
  --space-lg: 56px;
  --maxw: 1140px;

  /* Effects */
  --shadow: 0 24px 60px -24px rgba(2, 6, 23, 0.8);
  --t-fast: 0.18s ease;
  --t-card: 0.22s ease;

  /* Type */
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-display: "Sora", var(--font);
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3 { font-family: var(--font-display); line-height: 1.12; letter-spacing: -0.02em; margin: 0; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--space-md); }

/* Keyboard focus + skip link (a11y) */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: var(--radius-2xs); }
.btn:focus-visible, .nav-toggle:focus-visible { outline-offset: 3px; }
.skip-link {
  position: absolute;
  left: 16px;
  top: -120px;
  z-index: 100;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 10px 18px;
  font-weight: 600;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 16px; outline: 2px solid var(--accent); outline-offset: 2px; }

.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.98rem;
  padding: 13px 24px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--t-fast), box-shadow var(--t-fast), background var(--t-fast), border-color var(--t-fast);
  white-space: nowrap;
}
.btn svg { transition: transform var(--t-fast); }
.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 16px rgba(0, 0, 0, 0.32); }
.btn-ghost {
  background: var(--glass);
  border-color: var(--border-strong);
  color: var(--text);
}
.btn-ghost:hover { background: var(--glass-hover); transform: translateY(-2px); }
.btn-ghost:hover svg { transform: translateX(3px); }
.btn-lg { padding: 16px 30px; font-size: 1.05rem; }

/* ---------- Header / nav ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  transition: background 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: rgba(var(--bg-rgb) / 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: var(--nav-h); }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; }
.brand-mark { display: inline-flex; }
.brand-name { font-family: var(--font-display); font-size: 1.15rem; letter-spacing: -0.01em; }
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links > a:not(.btn) {
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--t-fast);
}
.nav-links > a:not(.btn):hover { color: var(--text); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  background: transparent;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.nav-toggle span { display: block; width: 18px; height: 2px; background: var(--text); margin: 0 auto; transition: transform 0.25s ease, opacity 0.2s ease; }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 188px 0 128px; overflow: hidden; isolation: isolate; }
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background-color: var(--bg);
  background-image: url("/img/hero.jpg");
  background-image: -webkit-image-set(url("/img/hero.webp") type("image/webp"), url("/img/hero.jpg") type("image/jpeg"));
  background-image: image-set(url("/img/hero.webp") type("image/webp"), url("/img/hero.jpg") type("image/jpeg"));
  background-size: cover;
  background-position: center;
  filter: saturate(1.05);
}
.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(88% 74% at 22% 34%, rgba(var(--bg-rgb) / 0.78) 0%, rgba(var(--bg-rgb) / 0.34) 42%, transparent 70%),
    linear-gradient(90deg, rgba(var(--bg-rgb) / 0.76) 0%, rgba(var(--bg-rgb) / 0.30) 52%, rgba(var(--bg-rgb) / 0.04) 100%),
    radial-gradient(900px 500px at 78% 0%, rgba(56, 189, 248, 0.15), transparent 60%),
    radial-gradient(700px 500px at 0% 30%, rgba(91, 140, 255, 0.13), transparent 55%),
    linear-gradient(180deg, rgba(var(--bg-rgb) / 0.36) 0%, rgba(var(--bg-rgb) / 0.42) 55%, var(--bg) 100%);
}
.hero-inner { max-width: 820px; }
.hero-title { font-size: clamp(2.6rem, 6vw, 4.6rem); font-weight: 800; margin-bottom: 22px; text-shadow: 0 2px 24px rgba(var(--bg-rgb) / 0.55); }
.hero-lead { font-size: clamp(1.05rem, 1.6vw, 1.3rem); color: var(--muted); max-width: 620px; margin-bottom: 34px; text-shadow: 0 1px 16px rgba(var(--bg-rgb) / 0.6); }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-sm); }

/* ---------- Sections ---------- */
.section { padding: 100px 0; }
.section[id], #top { scroll-margin-top: calc(var(--nav-h) + 10px); }
.section-alt { background: linear-gradient(180deg, var(--bg) 0%, var(--bg-alt) 50%, var(--bg) 100%); }
.section-head { max-width: 660px; margin: 0 auto var(--space-lg); text-align: center; }
.section-head h2 { font-size: clamp(1.9rem, 3.4vw, 2.7rem); margin-bottom: 16px; }
.section-sub { color: var(--muted); font-size: 1.08rem; }

/* ---------- Grid / cards ---------- */
.grid { display: grid; gap: 22px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

.card {
  background: linear-gradient(180deg, var(--surface) 0%, var(--bg-alt) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
  transition: transform var(--t-card), border-color var(--t-card), box-shadow var(--t-card);
}
.card:hover { transform: translateY(-6px); border-color: var(--border-strong); box-shadow: var(--shadow); }
.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: var(--radius-icon);
  background: var(--accent-tint);
  border: 1px solid var(--accent-tint-border);
  color: var(--accent);
  margin-bottom: 20px;
}
.card-icon svg { width: 26px; height: 26px; }
.card h3 { font-size: 1.2rem; margin-bottom: 10px; }
.card p { color: var(--muted); font-size: 0.97rem; }

/* ---------- Approach ---------- */
.approach-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: var(--space-lg); align-items: start; }
.approach-intro h2 { font-size: clamp(1.8rem, 3vw, 2.5rem); margin-bottom: 16px; }
.approach-list { display: flex; flex-direction: column; gap: var(--space-sm); }
.approach-item {
  display: flex;
  gap: 20px;
  padding: 24px 26px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.approach-num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--accent);
  flex: none;
  width: 38px;
}
.approach-item h3 { font-size: 1.15rem; margin-bottom: 6px; }
.approach-item p { color: var(--muted); font-size: 0.97rem; }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 5fr 7fr; gap: var(--space-lg); align-items: start; }
.about-head { position: sticky; top: calc(var(--nav-h) + 30px); }
.about-head h2 { font-size: clamp(1.8rem, 3vw, 2.5rem); margin-bottom: 0; max-width: 14ch; }
.about-body { max-width: 640px; }
.about-body p { color: var(--muted); margin-bottom: 16px; }
.checklist { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 12px; }
.checklist li { position: relative; padding-left: 32px; color: var(--text); }
.checklist li::before {
  content: "";
  position: absolute;
  left: 0; top: 3px;
  width: 20px; height: 20px;
  border-radius: var(--radius-xs);
  background: var(--ok-tint);
  border: 1px solid var(--ok-tint-border);
}
.checklist li::after {
  content: "";
  position: absolute;
  left: 6px; top: 8px;
  width: 7px; height: 4px;
  border-left: 2px solid var(--ok);
  border-bottom: 2px solid var(--ok);
  transform: rotate(-45deg);
}

/* ---------- Contact ---------- */
.contact { text-align: center; }
.contact-inner { max-width: 680px; margin: 0 auto; }
.contact h2 { font-size: clamp(2rem, 3.6vw, 2.9rem); margin-bottom: 16px; }
.contact-actions { display: flex; flex-wrap: wrap; gap: var(--space-sm); justify-content: center; margin-top: 32px; }
.contact-email { margin-top: 16px; font-size: 0.92rem; color: var(--muted-dim); }
.contact-email a { color: var(--muted-dim); text-decoration: none; transition: color var(--t-fast); }
.contact-email a:hover { color: var(--accent); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--border); background: var(--bg-alt); padding: 56px 0 30px; }
.footer-inner { display: flex; flex-wrap: wrap; gap: 32px 56px; align-items: flex-start; }
.footer-tag { color: var(--muted-dim); margin-top: 12px; font-size: 0.92rem; }
.footer-loc { display: inline-flex; align-items: center; gap: 7px; color: var(--muted-dim); margin-top: 8px; font-size: 0.9rem; }
.footer-loc svg { color: var(--accent); }
.footer-links { display: flex; flex-wrap: wrap; align-items: center; gap: 30px; margin-left: auto; }
.footer-links a { color: var(--muted); font-size: 0.95rem; font-weight: 500; transition: color var(--t-fast); }
.footer-links a:hover { color: var(--text); }
.footer-bottom { margin-top: 36px; padding-top: 22px; border-top: 1px solid var(--border); }
.footer-bottom p { color: var(--muted-dim); font-size: 0.86rem; }

/* ---------- Reveal animation (progressive enhancement) ----------
   Content is visible by default. Only when JS adds `.js-reveal` to <html>
   do we hide-then-animate, so the page is never blank without JS. */
.js-reveal .reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.6s ease, transform 0.6s ease; transition-delay: calc(var(--i, 0) * 0.06s); }
.js-reveal .reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js-reveal .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .approach-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-grid { grid-template-columns: 1fr; gap: 28px; }
  .about-head { position: static; top: auto; }
  .about-head h2 { max-width: 22ch; }
}

/* NOTE: this 720px breakpoint must stay in sync with the (min-width: 721px)
   matchMedia query in js/main.js that resets the mobile menu on resize. */
@media (max-width: 720px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: absolute;
    top: var(--nav-h);
    left: 16px;
    right: 16px;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    padding: 16px;
    background: rgba(var(--bg-alt-rgb) / 0.98);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    opacity: 0;
    transform: translateY(-10px);
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
  }
  .nav-links.open { opacity: 1; transform: none; visibility: visible; pointer-events: auto; }
  .nav-links > a:not(.btn) { padding: 10px 8px; }
  .nav-links .btn { margin-top: 6px; text-align: center; justify-content: center; }
  .hero { padding: 130px 0 84px; }
  .section { padding: 72px 0; }
  .footer-inner { flex-direction: column; gap: 28px; }
  .footer-links { margin-left: 0; }
}

@media (max-width: 440px) {
  .grid-3 { grid-template-columns: 1fr; }
  .hero-actions .btn, .contact-actions .btn { width: 100%; justify-content: center; }
}