/* PROTON MAGNETICS LLC — style.css
   Mobile-first. Breakpoints: 480 / 768 / 1024. Holds at 360px. */

:root {
  /* Color */
  --c-deep: #081636;
  --c-deep-2: #0B1D45;
  --c-panel: #0E2352;
  --c-blue: #1A47B8;
  --c-blue-soft: rgba(26, 71, 184, 0.35);
  --c-silver: #C4CDD9;
  --c-steel: #9AA8BD;
  --c-cyan: #2CF0FF;
  --c-cyan-dim: rgba(44, 240, 255, 0.18);
  --c-white: #EEF3F9;
  --c-line: rgba(196, 205, 217, 0.16);
  --c-line-strong: rgba(196, 205, 217, 0.34);

  /* Type */
  --f-display: "Oxanium", "Segoe UI", system-ui, sans-serif;
  --f-body: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --fs-small: 0.875rem;
  --fs-body: 1rem;
  --fs-lede: 1.125rem;
  --fs-h3: 1.25rem;
  --fs-h2: clamp(1.75rem, 1.3rem + 2vw, 2.625rem);
  --fs-h1: clamp(2.5rem, 1.6rem + 5vw, 5rem);

  /* Spacing */
  --s-1: 0.25rem;
  --s-2: 0.5rem;
  --s-3: 0.75rem;
  --s-4: 1rem;
  --s-5: 1.5rem;
  --s-6: 2rem;
  --s-7: 3rem;
  --s-8: 4.5rem;
  --s-9: 6rem;
  --gutter: 1.25rem;
  --container: 72rem;
  --header-h: 4rem;

  /* Radii */
  --r-sm: 4px;
  --r-md: 10px;
  --r-lg: 18px;

  /* Shadows */
  --sh-panel: 0 18px 40px -18px rgba(2, 8, 24, 0.9);
  --sh-offset: 8px 8px 0 0 var(--c-blue-soft);
  --sh-glow: 0 0 0 1px var(--c-cyan), 0 0 24px -4px rgba(44, 240, 255, 0.55);

  /* Motion */
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --t-fast: 160ms;
  --t-med: 320ms;
}

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

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + var(--s-4)); -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--c-deep);
  color: var(--c-white);
  font-family: var(--f-body);
  font-size: var(--fs-body);
  line-height: 1.6;
  min-width: 320px;
  -webkit-font-smoothing: antialiased;
}

img, svg, canvas { display: block; max-width: 100%; }

a { color: var(--c-cyan); text-underline-offset: 3px; }
a:hover { color: var(--c-white); }

:focus-visible { outline: 2px solid var(--c-cyan); outline-offset: 3px; border-radius: var(--r-sm); }

h1, h2, h3 { font-family: var(--f-display); line-height: 1.1; margin: 0; font-weight: 600; letter-spacing: -0.01em; }

p { margin: 0; }

.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: var(--s-4); top: -3rem; z-index: 100;
  background: var(--c-cyan); color: var(--c-deep); padding: var(--s-2) var(--s-4);
  border-radius: var(--r-sm); font-weight: 600; text-decoration: none;
  transition: transform var(--t-fast) var(--ease);
}
.skip-link:focus { transform: translateY(3.75rem); color: var(--c-deep); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 3rem; padding: 0 var(--s-5);
  font-family: var(--f-display); font-weight: 600; font-size: 1rem; letter-spacing: 0.02em;
  border-radius: var(--r-sm); border: 1px solid transparent;
  text-decoration: none; cursor: pointer;
  transition: transform var(--t-fast) var(--ease), background-color var(--t-fast), color var(--t-fast), box-shadow var(--t-fast);
}
.btn-primary { background: var(--c-cyan); color: var(--c-deep); box-shadow: 4px 4px 0 0 var(--c-blue); }
.btn-primary:hover { color: var(--c-deep); transform: translate(-2px, -2px); box-shadow: 6px 6px 0 0 var(--c-blue); }
.btn-ghost { background: rgba(8, 22, 54, 0.6); color: var(--c-white); border-color: var(--c-line-strong); }
.btn-ghost:hover { color: var(--c-white); border-color: var(--c-silver); }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(8, 22, 54, 0.82);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: var(--header-h); gap: var(--s-4); }

.brand { display: inline-flex; align-items: center; gap: var(--s-3); color: var(--c-white); text-decoration: none; }
.brand:hover { color: var(--c-white); }
.brand-mark { width: 30px; height: 30px; fill: none; stroke: var(--c-silver); stroke-width: 3.2; }
.brand-mark .brand-mark-pole { stroke: var(--c-cyan); stroke-linecap: round; }
.brand-name { font-family: var(--f-display); font-weight: 700; font-size: 1.125rem; letter-spacing: 0.03em; }

.nav-toggle {
  display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
  width: 44px; height: 44px; padding: 0 10px;
  background: transparent; border: 1px solid var(--c-line-strong); border-radius: var(--r-sm); cursor: pointer;
}
.nav-toggle-bar { display: block; height: 2px; width: 100%; background: var(--c-white); transition: transform var(--t-med) var(--ease), opacity var(--t-fast); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.site-nav {
  position: absolute; inset: var(--header-h) 0 auto 0;
  background: var(--c-deep-2); border-bottom: 1px solid var(--c-line);
  opacity: 0; visibility: hidden; transform: translateY(-8px);
  transition: opacity var(--t-med) var(--ease), transform var(--t-med) var(--ease), visibility 0s linear var(--t-med);
}
.site-nav.is-open { opacity: 1; visibility: visible; transform: translateY(0); transition-delay: 0s; }
.nav-list { list-style: none; margin: 0; padding: var(--s-3) var(--gutter) var(--s-5); display: grid; gap: var(--s-1); }
.nav-list a {
  display: block; padding: var(--s-3) 0; color: var(--c-silver); text-decoration: none;
  font-family: var(--f-display); font-weight: 500; font-size: 1.125rem;
  border-bottom: 1px solid var(--c-line);
}
.nav-list a:hover { color: var(--c-cyan); }
.nav-list .nav-cta { color: var(--c-cyan); border-bottom: 0; }

/* Static nav on secondary pages: always visible */
.site-nav-static { position: static; opacity: 1; visibility: visible; transform: none; background: transparent; border: 0; }
.site-nav-static .nav-list { padding: 0; }
.site-nav-static .nav-list a { border: 0; padding: var(--s-2) 0; font-size: 1rem; }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden; isolation: isolate;
  min-height: calc(100svh - var(--header-h));
  display: flex; align-items: flex-start;
  background:
    radial-gradient(60% 50% at 50% 85%, rgba(26, 71, 184, 0.55), transparent 70%),
    var(--c-deep);
}
.field-canvas { position: absolute; inset: 0; width: 100%; height: 100%; z-index: -1; }
.hero-grid {
  position: absolute; inset: 0; z-index: -2; pointer-events: none;
  background-image:
    linear-gradient(var(--c-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-line) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.45;
  -webkit-mask-image: radial-gradient(80% 70% at 50% 60%, #000 30%, transparent 85%);
  mask-image: radial-gradient(80% 70% at 50% 60%, #000 30%, transparent 85%);
}
.hero-inner { padding-block: var(--s-7) 16rem; pointer-events: none; }
.hero-copy { max-width: 36rem; pointer-events: auto; }
.hero-kicker { color: var(--c-cyan); font-family: var(--f-display); font-weight: 500; font-size: 1rem; margin-bottom: var(--s-4); }
.hero-title {
  font-size: var(--fs-h1); font-weight: 700; line-height: 0.98; letter-spacing: -0.025em;
  background: linear-gradient(180deg, var(--c-white) 30%, var(--c-silver) 60%, #7F8DA3 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  margin-bottom: var(--s-5);
}
.hero-lede { font-size: var(--fs-lede); color: var(--c-silver); max-width: 32rem; margin-bottom: var(--s-6); }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--s-3); }
.hero-hint { margin-top: var(--s-5); color: var(--c-steel); font-size: var(--fs-small); }

/* One orchestrated entrance */
@media (prefers-reduced-motion: no-preference) {
  .hero-kicker, .hero-title, .hero-lede, .hero-actions, .hero-hint {
    opacity: 0; transform: translateY(14px);
    animation: rise 700ms var(--ease) forwards;
  }
  .hero-title { animation-delay: 80ms; }
  .hero-lede { animation-delay: 180ms; }
  .hero-actions { animation-delay: 280ms; }
  .hero-hint { animation-delay: 420ms; }
  .field-canvas { opacity: 0; animation: fade 1200ms var(--ease) 150ms forwards; }
}
@keyframes rise { to { opacity: 1; transform: translateY(0); } }
@keyframes fade { to { opacity: 1; } }

/* ---------- Lamination divider (transformer core stack) ---------- */
.lamination {
  height: 22px;
  background: repeating-linear-gradient(180deg, var(--c-silver) 0 2px, var(--c-deep-2) 2px 5px);
  opacity: 0.55;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
}
.lamination-reverse { background: repeating-linear-gradient(180deg, var(--c-blue) 0 2px, var(--c-deep) 2px 5px); opacity: 0.9; }

/* ---------- Sections ---------- */
.section { padding-block: var(--s-8); }
.section-head { max-width: 42rem; margin-bottom: var(--s-6); }
.section-title { font-size: var(--fs-h2); margin-bottom: var(--s-4); }
.section-lede { color: var(--c-silver); font-size: var(--fs-lede); max-width: 38rem; }

/* ---------- Products catalog ---------- */
.products { background: linear-gradient(180deg, var(--c-deep-2), var(--c-deep)); }

.catalog { display: grid; gap: var(--s-5); }
.catalog-tabs {
  display: flex; gap: var(--s-2); overflow-x: auto; padding-bottom: var(--s-2);
  scrollbar-width: thin; scrollbar-color: var(--c-blue) transparent;
}
.catalog-tab {
  flex: 0 0 auto; display: flex; align-items: center; gap: var(--s-3);
  min-height: 3rem; padding: var(--s-2) var(--s-4);
  background: transparent; color: var(--c-silver);
  border: 1px solid var(--c-line-strong); border-radius: var(--r-sm);
  font-family: var(--f-display); font-size: 1rem; font-weight: 500; text-align: left; cursor: pointer;
  transition: color var(--t-fast), border-color var(--t-fast), background-color var(--t-fast);
}
.catalog-tab:hover { color: var(--c-white); border-color: var(--c-silver); }
.catalog-tab[aria-selected="true"] { color: var(--c-deep); background: var(--c-cyan); border-color: var(--c-cyan); }
.tab-index {
  display: inline-grid; place-items: center; width: 1.6rem; height: 1.6rem;
  border: 1px solid currentColor; border-radius: 50%; font-size: 0.8125rem; font-weight: 700;
}

.catalog-panels { position: relative; }
.catalog-panel {
  display: grid; gap: var(--s-5);
  padding: var(--s-5);
  background: var(--c-panel);
  border: 1px solid var(--c-line-strong);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-offset), var(--sh-panel);
}
.catalog-panel[hidden] { display: none; }
@media (prefers-reduced-motion: no-preference) {
  .catalog-panel.is-entering { animation: panelIn 380ms var(--ease); }
}
@keyframes panelIn { from { opacity: 0; transform: translateX(12px); } to { opacity: 1; transform: none; } }

.panel-figure {
  margin: 0; padding: var(--s-4);
  border-radius: var(--r-md);
  background:
    linear-gradient(var(--c-line) 1px, transparent 1px) 0 0 / 20px 20px,
    linear-gradient(90deg, var(--c-line) 1px, transparent 1px) 0 0 / 20px 20px,
    var(--c-deep);
  border: 1px solid var(--c-line);
}
.blueprint { width: 100%; height: auto; max-height: 220px; margin-inline: auto; }
.bp-core { fill: none; stroke: var(--c-silver); stroke-width: 2.5; stroke-linejoin: round; }
.bp-coil { fill: none; stroke: var(--c-cyan); stroke-width: 3; stroke-linecap: round; }
.bp-flux { fill: none; stroke: var(--c-cyan); stroke-width: 1.2; stroke-dasharray: 4 6; opacity: 0.7; }
.bp-label { fill: var(--c-steel); font-family: var(--f-display); font-size: 14px; font-weight: 600; }

.panel-title { font-size: 1.625rem; margin-bottom: var(--s-3); }
.panel-body p { color: var(--c-silver); }
.panel-body .panel-uses-title { margin-top: var(--s-5); margin-bottom: var(--s-2); color: var(--c-white); font-weight: 600; }
.panel-uses { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--s-2); }
.panel-uses li { position: relative; padding-left: var(--s-5); color: var(--c-silver); }
.panel-uses li::before {
  content: ""; position: absolute; left: 0; top: 0.62em;
  width: 10px; height: 2px; background: var(--c-cyan);
  box-shadow: 0 4px 0 var(--c-silver);
}

/* ---------- Process (real sequence) ---------- */
.process-steps { list-style: none; margin: 0; padding: 0; counter-reset: step; display: grid; gap: 0; position: relative; }
.process-step {
  counter-increment: step; position: relative;
  padding: 0 0 var(--s-6) calc(3rem + var(--s-4));
}
.process-step::before {
  content: counter(step);
  position: absolute; left: 0; top: -0.25rem;
  width: 3rem; height: 3rem; display: grid; place-items: center;
  font-family: var(--f-display); font-weight: 700; font-size: 1.25rem; color: var(--c-cyan);
  border: 1px solid var(--c-cyan); border-radius: 50%;
  background: var(--c-deep);
  box-shadow: 0 0 0 6px var(--c-deep), 0 0 22px -6px var(--c-cyan);
  z-index: 1;
}
.process-step::after {
  content: ""; position: absolute; left: 1.5rem; top: 2.75rem; bottom: 0;
  width: 0; border-left: 2px dashed var(--c-line-strong);
}
.process-step:last-child { padding-bottom: 0; }
.process-step:last-child::after { display: none; }
.step-title { font-size: var(--fs-h3); margin-bottom: var(--s-2); }
.process-step p { color: var(--c-silver); max-width: 34rem; }

/* ---------- Clients ---------- */
.clients { background: var(--c-deep-2); position: relative; overflow: hidden; }
.clients::before {
  content: ""; position: absolute; right: -8rem; top: -8rem; width: 26rem; height: 26rem;
  border-radius: 50%; border: 1px solid var(--c-line);
  box-shadow: 0 0 0 3rem rgba(26, 71, 184, 0.08), 0 0 0 6rem rgba(26, 71, 184, 0.05);
  pointer-events: none;
}
.clients-inner { position: relative; }
.clients .section-title { margin-bottom: var(--s-6); }
.client-grid { display: grid; gap: var(--s-4); }
.client {
  padding: var(--s-5);
  border-left: 3px solid var(--c-silver);
  background: linear-gradient(90deg, rgba(14, 35, 82, 0.9), rgba(14, 35, 82, 0.3));
}
.client-tech { border-left-color: var(--c-cyan); }
.client-b2b { border-left-color: var(--c-blue); }
.client-title { font-size: var(--fs-h3); margin-bottom: var(--s-3); }
.client p { color: var(--c-silver); }

/* ---------- Contact ---------- */
.contact-inner { display: grid; gap: var(--s-7); }
.contact-list { margin: var(--s-6) 0 0; display: grid; gap: var(--s-5); }
.contact-item dt { color: var(--c-steel); font-size: var(--fs-small); margin-bottom: var(--s-1); }
.contact-item dd { margin: 0; color: var(--c-white); overflow-wrap: anywhere; }

.contact-form {
  display: grid; gap: var(--s-4);
  padding: var(--s-5);
  background: var(--c-panel);
  border: 1px solid var(--c-line-strong);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-offset), var(--sh-panel);
}
.field { display: grid; gap: var(--s-2); }
.field label { font-size: var(--fs-small); font-weight: 500; color: var(--c-silver); }
.field input, .field select, .field textarea {
  width: 100%; min-height: 3rem; padding: var(--s-3) var(--s-4);
  font: inherit; color: var(--c-white);
  background: var(--c-deep); border: 1px solid var(--c-line-strong); border-radius: var(--r-sm);
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.field textarea { resize: vertical; min-height: 8rem; }
.field select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--c-cyan) 50%), linear-gradient(135deg, var(--c-cyan) 50%, transparent 50%); background-position: calc(100% - 20px) 50%, calc(100% - 14px) 50%; background-size: 6px 6px; background-repeat: no-repeat; padding-right: var(--s-7); }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--c-cyan); box-shadow: var(--sh-glow); }
.field.is-invalid input, .field.is-invalid textarea { border-color: #FF8A8A; }
.form-footer { display: grid; gap: var(--s-3); }
.form-status { font-size: var(--fs-small); color: var(--c-silver); min-height: 1.5em; }
.form-status.is-error { color: #FFB0B0; }

/* ---------- Footer ---------- */
.site-footer { background: #050F26; border-top: 1px solid var(--c-line); padding-block: var(--s-7) var(--s-6); font-size: 0.875rem; color: var(--c-silver); }
.footer-inner { display: grid; gap: var(--s-6); }
.footer-name { font-family: var(--f-display); font-weight: 700; color: var(--c-white); font-size: 1.125rem; margin-bottom: var(--s-3); }
.footer-nav { display: flex; flex-wrap: wrap; gap: var(--s-4); }
.footer-nav a { color: var(--c-silver); }
.footer-nav a:hover { color: var(--c-cyan); }
.legal { margin: 0; display: grid; gap: var(--s-3); }
.legal div { display: grid; gap: 2px; }
.legal dt { color: #A9B5C7; font-size: 0.8125rem; }
.legal dd { margin: 0; color: var(--c-white); overflow-wrap: anywhere; }
.copyright { font-size: 0.8125rem; color: #A9B5C7; border-top: 1px solid var(--c-line); padding-top: var(--s-4); }

/* ---------- Secondary pages ---------- */
.page-title { font-size: var(--fs-h2); margin-bottom: var(--s-3); }
.page-meta { color: var(--c-steel); font-size: var(--fs-small); margin-bottom: var(--s-6); }
.prose { max-width: 46rem; }
.prose h2 { font-size: 1.375rem; margin: var(--s-6) 0 var(--s-3); }
.prose p { color: var(--c-silver); margin-bottom: var(--s-4); }
.notfound { min-height: 60vh; display: flex; align-items: center; }
.notfound-inner { display: grid; justify-items: start; gap: var(--s-4); }
.notfound-code {
  font-family: var(--f-display); font-weight: 700; font-size: clamp(5rem, 3rem + 12vw, 10rem); line-height: 1;
  color: transparent; -webkit-text-stroke: 2px var(--c-cyan);
}

/* ---------- 480 ---------- */
@media (min-width: 480px) {
  :root { --gutter: 1.5rem; }
  .catalog-panel, .contact-form { padding: var(--s-6); }
  .contact-form { grid-template-columns: 1fr 1fr; }
  .field-wide, .form-footer { grid-column: 1 / -1; }
  .form-footer { grid-template-columns: auto 1fr; align-items: center; gap: var(--s-4); }
  .legal { grid-template-columns: 1fr 1fr; column-gap: var(--s-5); }
  .legal div:nth-child(6) { grid-column: 1 / -1; }
}

/* ---------- 768 ---------- */
@media (min-width: 768px) {
  :root { --gutter: 2rem; --header-h: 4.5rem; }
  .section { padding-block: var(--s-9); }
  .nav-toggle { display: none; }
  .site-nav { position: static; opacity: 1; visibility: visible; transform: none; background: transparent; border: 0; transition: none; }
  .nav-list { display: flex; align-items: center; gap: var(--s-6); padding: 0; }
  .nav-list a { border: 0; padding: var(--s-2) 0; font-size: 1rem; position: relative; }
  .nav-list a:not(.nav-cta)::after {
    content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 2px; background: var(--c-cyan);
    transform: scaleX(0); transform-origin: left; transition: transform var(--t-med) var(--ease);
  }
  .nav-list a:not(.nav-cta):hover::after { transform: scaleX(1); }
  .nav-list .nav-cta { padding: var(--s-2) var(--s-4); border: 1px solid var(--c-cyan); border-radius: var(--r-sm); }
  .nav-list .nav-cta:hover { background: var(--c-cyan); color: var(--c-deep); }

  .hero { align-items: center; }
  .hero-inner { padding-block: var(--s-8); }

  .catalog-panel { grid-template-columns: 1fr 1.1fr; align-items: center; }
  .client-grid { grid-template-columns: repeat(3, 1fr); }
  .client-industrial { transform: translateY(var(--s-6)); }
  .clients { padding-bottom: calc(var(--s-9) + var(--s-6)); }

  .process-steps { grid-template-columns: repeat(4, 1fr); gap: var(--s-5); }
  .process-step { padding: calc(3rem + var(--s-5)) 0 0; }
  .process-step::before { top: 0; }
  .process-step::after { left: 3.5rem; right: calc(-1 * var(--s-5)); top: 1.5rem; bottom: auto; width: auto; border-left: 0; border-top: 2px dashed var(--c-line-strong); }

  .footer-inner { grid-template-columns: 1fr 2fr; }
  .copyright { grid-column: 1 / -1; }
}

/* ---------- 1024 ---------- */
@media (min-width: 1024px) {
  .catalog { grid-template-columns: 17rem 1fr; align-items: start; gap: var(--s-6); }
  .catalog-tabs { flex-direction: column; overflow: visible; padding: 0; position: sticky; top: calc(var(--header-h) + var(--s-5)); }
  .catalog-tab { width: 100%; }
  .contact-inner { grid-template-columns: 1fr 1.25fr; align-items: start; gap: var(--s-8); }
  .legal { grid-template-columns: repeat(3, 1fr); }
  .legal div:nth-child(6) { grid-column: span 2; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}