/* =========================================================
   Turbomachinery.consulting — styles
   Palette: navy blue on a white background.
   No logo mark. No orange / brass / amber anywhere.
   ========================================================= */

/* ---------- Tokens ---------- */
:root {
  /* Type scale (fluid) */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.3rem + 2.4vw, 3.4rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);

  /* Spacing (4px base) */
  --space-1: 0.25rem;  --space-2: 0.5rem;  --space-3: 0.75rem;
  --space-4: 1rem;     --space-5: 1.25rem; --space-6: 1.5rem;
  --space-8: 2rem;     --space-10: 2.5rem; --space-12: 3rem;
  --space-16: 4rem;    --space-20: 5rem;   --space-24: 6rem;
  --space-32: 8rem;

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.4rem;
  --radius-lg: 0.6rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --content-wide: 1180px;

  /* Fonts */
  --font-display: 'Space Grotesk', 'Helvetica Neue', Arial, sans-serif;
  --font-body: 'Inter Tight', 'Helvetica Neue', Arial, sans-serif;
}

:root {
  --color-bg: #ffffff;
  --color-bg-2: #f3f7fc;
  --color-surface: #ffffff;
  --color-surface-2: #f8fbff;
  --color-border: #d9e3ef;
  --color-border-strong: #aebed2;

  --color-text: #081a33;
  --color-text-muted: #415673;
  --color-text-faint: #7d8ea5;

  --color-accent: #1554c0;
  --color-accent-2: #092f6f;
  --color-accent-soft: rgba(21, 84, 192, 0.11);
  --color-accent-contrast: #ffffff;

  --grid-line: rgba(9, 47, 111, 0.07);
  --shadow-md: 0 10px 30px rgba(8, 26, 51, 0.10);
}

/* ---------- Base reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  transition: background-color var(--transition-interactive), color var(--transition-interactive);
}

img, svg { display: block; max-width: 100%; height: auto; }
ul[role='list'], ol[role='list'] { list-style: none; }

h1, h2, h3, h4 { text-wrap: balance; line-height: 1.12; font-family: var(--font-display); font-weight: 600; letter-spacing: -0.01em; }
p { text-wrap: pretty; }

a { color: inherit; text-decoration: none; }

::selection { background: var(--color-accent-soft); color: var(--color-text); }

:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; border-radius: var(--radius-sm); }

button { cursor: pointer; background: none; border: none; color: inherit; font: inherit; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 200;
  background: var(--color-accent); color: var(--color-accent-contrast);
  padding: var(--space-2) var(--space-4); border-radius: 0 0 var(--radius-md) 0;
}
.skip-link:focus { left: 0; }

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-5), 5vw, var(--space-16));
}

.band { padding-block: clamp(var(--space-16), 9vw, var(--space-32)); }
.band-alt { background: var(--color-bg-2); border-block: 1px solid var(--color-border); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  font-family: var(--font-display); font-weight: 600;
  font-size: var(--text-sm);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  letter-spacing: 0.01em;
  transition: background var(--transition-interactive), color var(--transition-interactive),
              border-color var(--transition-interactive), transform var(--transition-interactive),
              box-shadow var(--transition-interactive);
}
.btn-accent {
  background: var(--color-accent); color: var(--color-accent-contrast);
  box-shadow: 0 0 0 0 var(--color-accent-soft);
}
.btn-accent:hover { transform: translateY(-2px); box-shadow: 0 10px 26px var(--color-accent-soft); }
.btn-ghost { border-color: var(--color-border-strong); color: var(--color-text); }
.btn-ghost:hover { border-color: var(--color-accent); color: var(--color-accent); }
.btn-sm { padding: var(--space-2) var(--space-4); }
.btn-lg { font-size: var(--text-base); padding: var(--space-4) var(--space-8); }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 80;
  background: color-mix(in srgb, var(--color-bg) 82%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-interactive), background var(--transition-interactive);
}
.site-header.scrolled { border-bottom-color: var(--color-border); }
.header-inner { display: flex; align-items: center; gap: var(--space-6); min-height: 4.25rem; }

.brand { display: inline-flex; align-items: center; color: var(--color-text); }
.brand-text { font-family: var(--font-display); font-weight: 700; font-size: var(--text-base); letter-spacing: -0.015em; }
.brand-dot { color: var(--color-accent); }

.site-nav { display: flex; gap: var(--space-6); margin-left: auto; }
.site-nav a { font-size: var(--text-sm); color: var(--color-text-muted); position: relative; padding-block: var(--space-1); }
.site-nav a:hover { color: var(--color-text); }
.site-nav a::after {
  content: ''; position: absolute; left: 0; bottom: -2px; height: 2px; width: 0;
  background: var(--color-accent); transition: width var(--transition-interactive);
}
.site-nav a:hover::after { width: 100%; }

.header-actions { display: flex; align-items: center; gap: var(--space-3); }
/* ---------- Grid overlay (industrial blueprint feel) ---------- */
.grid-overlay {
  position: absolute; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 40%, transparent 100%);
}

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  padding-block: clamp(var(--space-20), 13vw, 11rem) clamp(var(--space-16), 9vw, var(--space-32));
  background:
    radial-gradient(95% 80% at 78% -10%, color-mix(in srgb, var(--color-accent) 10%, transparent) 0%, transparent 58%),
    linear-gradient(180deg, #f7fbff, var(--color-bg));
}
.hero-inner { position: relative; z-index: 1; max-width: 60rem; }

.eyebrow {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-family: var(--font-display); font-size: var(--text-xs); font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.16em; color: var(--color-text-muted);
  border: 1px solid var(--color-border); border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-4); margin-bottom: var(--space-6);
}
.status-dot {
  width: 8px; height: 8px; border-radius: 50%; background: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-soft);
}

.hero-title { font-size: var(--text-2xl); font-weight: 700; line-height: 1.06; }
.accent-text { color: var(--color-accent); }
.hero-lead {
  margin-top: var(--space-6); max-width: 46ch;
  font-size: var(--text-lg); color: var(--color-text-muted); line-height: 1.55;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-8); }

.hero-stats {
  display: grid; grid-template-columns: repeat(3, auto); gap: var(--space-8) var(--space-12);
  margin-top: var(--space-12); padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
}
.hero-stats dt { font-family: var(--font-display); font-weight: 600; font-size: var(--text-lg); color: var(--color-text); }
.hero-stats dd { font-size: var(--text-sm); color: var(--color-text-faint); margin-top: var(--space-1); }

/* ---------- Section heads ---------- */
.section-kicker, .section-title {
  font-family: var(--font-display);
}
.section-head { max-width: 52ch; margin-bottom: clamp(var(--space-10), 5vw, var(--space-16)); }
.section-title {
  font-size: var(--text-xl); font-weight: 700;
  display: inline-flex; align-items: baseline; gap: var(--space-3);
}
.section-title::before {
  content: ''; width: 26px; height: 3px; background: var(--color-accent);
  display: inline-block; transform: translateY(-0.35em);
}
.section-sub { margin-top: var(--space-3); color: var(--color-text-muted); font-size: var(--text-base); }

/* ---------- Trust statement ---------- */
.trust .section-kicker {
  font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.16em;
  color: var(--color-accent); font-weight: 600; margin-bottom: var(--space-5);
}
.trust-statement {
  font-family: var(--font-display); font-weight: 500;
  font-size: var(--text-lg); line-height: 1.5; max-width: 40ch; color: var(--color-text);
}
@media (min-width: 760px) { .trust-statement { max-width: 62ch; } }

/* ---------- Cards (services) ---------- */
.card-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 19rem), 1fr));
  gap: var(--space-5);
}
.card {
  position: relative; background: var(--color-surface);
  border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  padding: var(--space-8) var(--space-6) var(--space-6);
  box-shadow: var(--shadow-md);
  transition: border-color var(--transition-interactive), transform var(--transition-interactive), background var(--transition-interactive);
}
.card::before {
  content: ''; position: absolute; left: 0; top: 0; height: 3px; width: 0;
  background: var(--color-accent); border-radius: var(--radius-lg) 0 0 0;
  transition: width var(--transition-interactive);
}
.card:hover { transform: translateY(-3px); border-color: var(--color-border-strong); }
.card:hover::before { width: 48px; }
.card-num { font-family: var(--font-display); font-size: var(--text-sm); font-weight: 600; color: var(--color-accent); letter-spacing: 0.08em; }
.card h3 { font-size: var(--text-lg); margin: var(--space-3) 0 var(--space-3); }
.card p { color: var(--color-text-muted); font-size: var(--text-sm); line-height: 1.6; }

/* ---------- Proof points ---------- */
.proof-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr));
  gap: var(--space-5);
}
.proof {
  border-left: 2px solid var(--color-accent);
  padding: var(--space-2) 0 var(--space-2) var(--space-5);
}
.proof-stat { font-family: var(--font-display); font-weight: 600; font-size: var(--text-lg); color: var(--color-text); }
.proof-body { margin-top: var(--space-2); color: var(--color-text-muted); font-size: var(--text-sm); line-height: 1.6; }

/* ---------- Engagements ---------- */
.eng-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr));
  gap: var(--space-5);
}
.eng {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: var(--space-8);
  transition: border-color var(--transition-interactive);
}
.eng:hover { border-color: var(--color-accent); }
.eng h3 { font-size: var(--text-lg); margin-bottom: var(--space-3); }
.eng p { color: var(--color-text-muted); font-size: var(--text-sm); line-height: 1.6; }

/* ---------- Process steps ---------- */
.steps {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr));
  gap: var(--space-8) var(--space-6); counter-reset: step;
}
.step { position: relative; padding-top: var(--space-8); }
.step::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: var(--color-border);
}
.step-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 2.5rem; height: 2.5rem; border-radius: var(--radius-md);
  border: 1px solid var(--color-accent); color: var(--color-accent);
  font-family: var(--font-display); font-weight: 600; font-size: var(--text-base);
  margin-bottom: var(--space-4);
}
.step h3 { font-size: var(--text-lg); margin-bottom: var(--space-2); }
.step p { color: var(--color-text-muted); font-size: var(--text-sm); line-height: 1.6; }

/* ---------- Final CTA ---------- */
.cta-band {
  position: relative; overflow: hidden; text-align: center;
  background:
    radial-gradient(90% 120% at 50% 0%, color-mix(in srgb, var(--color-accent) 10%, transparent) 0%, transparent 60%),
    var(--color-bg-2);
  border-top: 1px solid var(--color-border);
}
.cta-inner { position: relative; z-index: 1; max-width: 44rem; margin-inline: auto; }
.cta-title { font-size: var(--text-xl); font-weight: 700; }
.cta-lead { margin: var(--space-5) auto var(--space-8); color: var(--color-text-muted); font-size: var(--text-lg); max-width: 50ch; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--color-border); padding-block: var(--space-12); }
.footer-inner { display: flex; flex-direction: column; gap: var(--space-3); align-items: flex-start; }
.footer-brand { display: inline-flex; align-items: center; font-family: var(--font-display); font-weight: 700; color: var(--color-text); }
.footer-tag { color: var(--color-text-muted); font-size: var(--text-sm); max-width: 60ch; }
.footer-mail { color: var(--color-accent); font-family: var(--font-display); font-weight: 600; font-size: var(--text-base); }
.footer-mail:hover { text-decoration: underline; text-underline-offset: 3px; }
.footer-copy { color: var(--color-text-faint); font-size: var(--text-xs); margin-top: var(--space-2); }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .site-nav { display: none; }
}
@media (max-width: 560px) {
  .hero-stats { grid-template-columns: 1fr; gap: var(--space-5); }
  .hero-break { display: none; }
  .header-cta { display: none; }
}