/* =========================================================
   Force Mind — B2B AI Solutions landing page
   Plain HTML + CSS + JS, no build step.
   Fonts: Space Grotesk (headings) + DM Sans (body).
   ========================================================= */

/* ---------- Design tokens ---------- */
:root{
  /* Light theme (default tokens, overridden by [data-theme="dark"]) */
  --bg: #F8FAFC;
  --bg-soft: #EEF2FA;
  --surface: #FFFFFF;
  --surface-2: #F1F5F9;
  --border: #E2E8F0;
  --text: #0F172A;
  --text-muted: #51607A;

  --primary: #2563EB;
  --primary-strong: #1D4ED8;
  --on-primary: #FFFFFF;

  --accent: #7C3AED;
  --accent-strong: #6D28D9;
  --cyan: #0891B2;

  --header-bg: rgba(248, 250, 252, 0.82);
  --card-shadow: 0 12px 30px -18px rgba(15, 23, 42, 0.18);
  --focus-ring: 0 0 0 3px rgba(37, 99, 235, 0.35);

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;

  --container: 1180px;
  --header-h: 76px;

  --dur-fast: 150ms;
  --dur-base: 220ms;
  --ease: cubic-bezier(.4,0,.2,1);
}

[data-theme="dark"]{
  --bg: #070B14;
  --bg-soft: #0B1120;
  --surface: #101828;
  --surface-2: #141D30;
  --border: rgba(255,255,255,0.08);
  --text: #F1F5F9;
  --text-muted: #9AA7C2;

  --primary: #3B82F6;
  --primary-strong: #60A5FA;
  --on-primary: #061020;

  --accent: #A78BFA;
  --accent-strong: #C4B5FD;
  --cyan: #22D3EE;

  --header-bg: rgba(7, 11, 20, 0.72);
  --card-shadow: 0 20px 45px -20px rgba(0,0,0,0.6);
  --focus-ring: 0 0 0 3px rgba(96, 165, 250, 0.45);
}

/* Primary buttons need guaranteed 4.5:1 contrast against white text in
   BOTH themes, so the button surface stays a fixed accessible blue while
   text/link accents can shift lighter for dark backgrounds. */
:root, [data-theme="dark"]{
  --btn-primary-bg: #2563EB;
  --btn-primary-bg-hover: #1D4ED8;
  --btn-primary-text: #FFFFFF;
}

/* ---------- Reset ---------- */
*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body{
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Sans', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  transition: background-color var(--dur-base) var(--ease), color var(--dur-base) var(--ease);
}
img{ max-width: 100%; display: block; }
a{ color: inherit; text-decoration: none; }
ul, ol{ margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4{
  font-family: 'Space Grotesk', 'DM Sans', sans-serif;
  line-height: 1.2;
  margin: 0 0 .6em;
  font-weight: 600;
  letter-spacing: -0.01em;
}
p{ margin: 0 0 1em; color: var(--text-muted); max-width: 62ch; }
button{ font-family: inherit; }

@media (prefers-reduced-motion: reduce){
  *, *::before, *::after{ animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

/* ---------- Layout helpers ---------- */
.container{ width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section{ padding: 96px 0; }
.section--alt{ background: var(--bg-soft); }
.section-head{ max-width: 640px; margin: 0 auto 56px; text-align: center; }
.section-head h2{ font-size: clamp(1.7rem, 1.2rem + 1.8vw, 2.4rem); }
.section-lede{ margin: 0 auto; }
.eyebrow{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--primary-strong);
  margin-bottom: 14px;
}
.eyebrow::before{
  content: "";
  width: 8px; height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--cyan), var(--accent));
}

.skip-link{
  position: absolute; left: -999px; top: 0;
  background: var(--primary); color: #fff;
  padding: 10px 16px; border-radius: 0 0 8px 0; z-index: 200;
}
.skip-link:focus{ left: 0; }

:focus-visible{ outline: none; box-shadow: var(--focus-ring); border-radius: 4px; }

/* ---------- Buttons ---------- */
.btn{
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: .95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease), background-color var(--dur-base) var(--ease), border-color var(--dur-base) var(--ease), box-shadow var(--dur-base) var(--ease);
  min-height: 44px;
}
.btn:active{ transform: translateY(1px); }
.btn-primary{
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  box-shadow: 0 14px 28px -14px rgba(37, 99, 235, .55);
}
.btn-primary:hover{ background: var(--btn-primary-bg-hover); }
.btn-ghost{
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover{ border-color: var(--primary); color: var(--primary-strong); }
.btn-lg{ padding: 14px 28px; font-size: 1rem; }
.btn-sm{ padding: 9px 18px; font-size: .85rem; }
.btn-block{ width: 100%; }

/* ---------- Header ---------- */
.site-header{
  position: sticky; top: 0; z-index: 100;
  background: var(--header-bg);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.header-inner{
  display: flex; align-items: center; justify-content: space-between;
  height: var(--header-h);
  gap: 20px;
}
.brand{ display: flex; align-items: center; min-width: 0; }
.brand-logo{ height: 34px; width: auto; }
[data-theme="dark"] .brand-logo--light,
[data-theme="light"] .brand-logo--dark{ display: none; }

.main-nav ul{ display: flex; gap: 28px; }
.main-nav a{
  font-size: .95rem; font-weight: 500; color: var(--text-muted);
  padding: 6px 2px; position: relative;
  transition: color var(--dur-fast) var(--ease);
}
.main-nav a:hover{ color: var(--text); }
.main-nav a.active{ color: var(--primary-strong); }
.main-nav a.active::after{
  content: ""; position: absolute; left: 0; right: 0; bottom: -8px;
  height: 2px; border-radius: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--accent));
}

.header-actions{ display: flex; align-items: center; gap: 12px; }
.theme-toggle{
  width: 40px; height: 40px; border-radius: 50%;
  border: 1px solid var(--border); background: var(--surface);
  color: var(--text); display: flex; align-items: center; justify-content: center;
  cursor: pointer;
}
.icon{ width: 20px; height: 20px; }
.icon-sun{ display: none; }
[data-theme="dark"] .icon-sun{ display: block; }
[data-theme="dark"] .icon-moon{ display: none; }

.nav-toggle{
  display: none;
  width: 40px; height: 40px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--surface);
  cursor: pointer; flex-direction: column; align-items: center; justify-content: center; gap: 4px;
}
.nav-toggle span{ width: 18px; height: 2px; background: var(--text); transition: transform var(--dur-base) var(--ease), opacity var(--dur-base) var(--ease); border-radius: 2px; }
.nav-toggle[aria-expanded="true"] span:nth-child(1){ transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2){ opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3){ transform: translateY(-6px) rotate(-45deg); }

.mobile-nav{
  display: none;
  border-top: 1px solid var(--border);
  background: var(--bg);
  padding: 20px 24px 28px;
}
.mobile-nav[data-open="true"]{ display: block; }
.mobile-nav ul{ display: flex; flex-direction: column; gap: 4px; margin-bottom: 18px; }
.mobile-nav a{ display: block; padding: 12px 4px; font-weight: 500; font-size: 1.05rem; border-bottom: 1px solid var(--border); min-height: 44px; display: flex; align-items: center; }

/* ---------- Hero ---------- */
.hero{ position: relative; overflow: hidden; padding-top: 64px; }
.hero-bg{
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(60% 55% at 82% 8%, color-mix(in srgb, var(--cyan) 20%, transparent), transparent 60%),
    radial-gradient(50% 50% at 8% 90%, color-mix(in srgb, var(--accent) 18%, transparent), transparent 60%);
}
.hero-inner{
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1.05fr .95fr;
  gap: 48px; align-items: center;
  padding: 64px 0 88px;
}
.hero h1{ font-size: clamp(2.1rem, 1.4rem + 3vw, 3.4rem); margin-bottom: .5em; }
.hero-lede{ font-size: 1.08rem; max-width: 46ch; }
.hero-actions{ display: flex; flex-wrap: wrap; gap: 14px; margin: 28px 0 18px; }
.hero-note{ font-size: .85rem; color: var(--text-muted); opacity: .9; }

.hero-visual{ position: relative; min-height: 420px; }
.hero-network{
  position: absolute; inset: 0; width: 100%; height: 100%;
  color: var(--border);
  opacity: .8;
}
[data-theme="dark"] .hero-network{ color: rgba(148, 163, 184, .25); }
.hero-network .net-nodes{ color: var(--cyan); }

.visual-card{
  position: relative; z-index: 2;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--card-shadow);
}
.visual-card--main{ padding: 22px; max-width: 360px; margin: 40px auto 0; }
.visual-card__header{ display: flex; align-items: center; gap: 8px; margin-bottom: 18px; }
.dot{ width: 9px; height: 9px; border-radius: 50%; }
.dot--cyan{ background: var(--cyan); }
.dot--violet{ background: var(--accent); }
.dot--blue{ background: var(--primary); }
.visual-card__title{ margin-left: 6px; font-size: .8rem; font-weight: 600; color: var(--text-muted); }

.visual-bars{ display: flex; align-items: flex-end; gap: 8px; height: 90px; margin-bottom: 20px; }
.visual-bars span{
  flex: 1; height: var(--h);
  border-radius: 6px 6px 2px 2px;
  background: linear-gradient(180deg, var(--cyan), var(--primary));
  opacity: .85;
}
.visual-metrics{ display: flex; justify-content: space-between; gap: 12px; }
.visual-metrics div{ display: flex; flex-direction: column; gap: 4px; }
.visual-metrics strong{ font-size: .72rem; color: var(--text-muted); font-weight: 500; }
.visual-metrics span{ font-family: 'Space Grotesk', sans-serif; font-weight: 600; font-size: 1.05rem; }

.visual-card--float{
  position: absolute;
  display: flex; align-items: center; gap: 10px;
  padding: 12px 16px;
  font-size: .82rem; font-weight: 600;
  box-shadow: var(--card-shadow);
}
.visual-card--float .net-icon{ width: 20px; height: 20px; color: var(--accent-strong); flex-shrink: 0; }
.visual-card--top{ top: 6%; left: -4%; }
.visual-card--bottom{ bottom: 4%; right: -4%; }

@media (prefers-reduced-motion: no-preference){
  .visual-card--float{ animation: float 6s ease-in-out infinite; }
  .visual-card--bottom{ animation-delay: -3s; }
}
@keyframes float{
  0%, 100%{ transform: translateY(0); }
  50%{ transform: translateY(-10px); }
}

/* ---------- Cards / grids ---------- */
.card-grid{ display: grid; gap: 22px; }
.card-grid--3{ grid-template-columns: repeat(3, 1fr); }
.card-grid--4{ grid-template-columns: repeat(4, 1fr); }

.card{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: transform var(--dur-base) var(--ease), box-shadow var(--dur-base) var(--ease), border-color var(--dur-base) var(--ease);
}
.card:hover{ transform: translateY(-4px); box-shadow: var(--card-shadow); border-color: color-mix(in srgb, var(--primary) 35%, var(--border)); }
.card h3{ font-size: 1.15rem; margin-bottom: .4em; }
.card p{ font-size: .95rem; }
.card--compact{ padding: 22px; }
.card--compact h3{ font-size: 1.05rem; margin-bottom: .5em; }

.card-icon{
  width: 48px; height: 48px; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
}
.card-icon svg{ width: 24px; height: 24px; }
.card-icon--blue{ background: color-mix(in srgb, var(--primary) 14%, transparent); color: var(--primary-strong); }
.card-icon--violet{ background: color-mix(in srgb, var(--accent) 16%, transparent); color: var(--accent-strong); }
.card-icon--cyan{ background: color-mix(in srgb, var(--cyan) 16%, transparent); color: var(--cyan); }

.card-list{ margin-top: 12px; display: flex; flex-direction: column; gap: 8px; }
.card-list li{
  font-size: .88rem; color: var(--text-muted);
  padding-left: 18px; position: relative;
}
.card-list li::before{
  content: ""; position: absolute; left: 0; top: 8px;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--cyan);
}

/* ---------- Timeline ---------- */
.timeline{
  display: grid; grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  position: relative;
}
.timeline::before{
  content: "";
  position: absolute; top: 26px; left: 5%; right: 5%; height: 1px;
  background: linear-gradient(90deg, var(--cyan), var(--accent));
  opacity: .35;
}
.timeline-step{ position: relative; text-align: center; padding-top: 0; }
.timeline-icon{
  width: 52px; height: 52px; margin: 0 auto 18px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  color: var(--primary-strong);
  position: relative; z-index: 1;
  box-shadow: var(--card-shadow);
}
.timeline-icon svg{ width: 24px; height: 24px; }
.timeline-step h3{ font-size: 1rem; margin-bottom: .3em; }
.timeline-step p{ font-size: .85rem; margin: 0 auto; max-width: 22ch; }

/* ---------- Case cards ---------- */
.case-card{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 26px;
}
.case-tag{
  display: inline-block;
  font-size: .72rem; font-weight: 700; letter-spacing: .04em; text-transform: uppercase;
  color: var(--accent-strong);
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  padding: 5px 12px; border-radius: 999px;
  margin-bottom: 16px;
}
.case-card dl{ display: flex; flex-direction: column; gap: 12px; margin: 0; }
.case-card dt{ font-size: .78rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: .04em; margin-bottom: 2px; }
.case-card dd{ margin: 0; font-size: .92rem; color: var(--text); }

/* ---------- About ---------- */
.about-grid{ display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.about-list{ display: flex; flex-direction: column; gap: 20px; }
.about-list li{ display: flex; gap: 14px; align-items: flex-start; }
.about-list .check{
  flex-shrink: 0; width: 28px; height: 28px; border-radius: 50%;
  background: color-mix(in srgb, var(--cyan) 18%, transparent);
  color: var(--cyan);
  display: flex; align-items: center; justify-content: center;
  font-size: .85rem; font-weight: 700;
}
.about-list strong{ display: block; font-family: 'Space Grotesk', sans-serif; font-size: 1rem; margin-bottom: 2px; }
.about-list span{ display: block; font-size: .88rem; color: var(--text-muted); }

/* ---------- Contact ---------- */
.section--contact{ padding-bottom: 110px; }
.contact-panel{
  display: grid; grid-template-columns: 1fr 1.15fr; gap: 48px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--card-shadow);
}
.contact-copy h2{ font-size: clamp(1.6rem, 1.2rem + 1.2vw, 2.1rem); }
.contact-email{
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 600; color: var(--primary-strong);
  margin-top: 8px;
}
.contact-email:hover{ text-decoration: underline; }

.contact-form{ display: flex; flex-direction: column; gap: 18px; }
.form-row{ display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-field{ display: flex; flex-direction: column; gap: 6px; }
.form-field label{ font-size: .85rem; font-weight: 600; color: var(--text); }
.form-field label span{ color: var(--accent-strong); margin-left: 3px; }
.form-field input,
.form-field textarea{
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font: inherit;
  min-height: 44px;
  transition: border-color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}
.form-field textarea{ min-height: 110px; resize: vertical; }
.form-field input:focus,
.form-field textarea:focus{ border-color: var(--primary); box-shadow: var(--focus-ring); outline: none; }
.form-field input[aria-invalid="true"],
.form-field textarea[aria-invalid="true"]{ border-color: #DC2626; }
.field-error{ font-size: .78rem; color: #DC2626; margin: 0; min-height: 1em; }
.form-status{ font-size: .9rem; margin: 0; min-height: 1.2em; }
.form-status[data-state="success"]{ color: #059669; }
.form-status[data-state="error"]{ color: #DC2626; }
.hp-field{
  position: absolute;
  left: -10000px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

/* ---------- Footer ---------- */
.site-footer{ border-top: 1px solid var(--border); padding: 48px 0 32px; }
.footer-inner{ display: flex; flex-wrap: wrap; gap: 32px; justify-content: space-between; align-items: flex-start; }
.footer-brand{ display: flex; align-items: center; gap: 12px; }
.footer-brand img{ width: 36px; height: 32px; }
.footer-brand strong{ display: block; font-family: 'Space Grotesk', sans-serif; }
.footer-brand span{ display: block; font-size: .78rem; color: var(--text-muted); }
.footer-nav{ display: flex; flex-wrap: wrap; gap: 20px; font-size: .9rem; color: var(--text-muted); }
.footer-nav a:hover{ color: var(--text); }
.footer-legal{ font-size: .78rem; color: var(--text-muted); max-width: 360px; }
.footer-legal p{ margin: 0 0 6px; font-size: .78rem; color: var(--text-muted); max-width: none; }

/* ---------- Scroll reveal ---------- */
.reveal{ opacity: 1; transform: none; }
@media (prefers-reduced-motion: no-preference){
  .reveal{ opacity: 0; transform: translateY(18px); transition: opacity 600ms var(--ease), transform 600ms var(--ease); }
  .reveal.is-visible{ opacity: 1; transform: none; }
}

/* =========================================================
   Responsive breakpoints: 375 / 768 / 1024 / 1440
   ========================================================= */

@media (max-width: 1024px){
  .card-grid--4{ grid-template-columns: repeat(2, 1fr); }
  .timeline{ grid-template-columns: repeat(5, 1fr); gap: 12px; }
  .timeline-step p{ max-width: none; }
  .about-grid{ gap: 40px; }
}

@media (max-width: 900px){
  .hero-inner{ grid-template-columns: 1fr; padding-top: 40px; }
  .hero-visual{ order: -1; min-height: 340px; }
  .visual-card--top{ left: 0; }
  .visual-card--bottom{ right: 0; }
  .card-grid--3{ grid-template-columns: repeat(2, 1fr); }
  .about-grid{ grid-template-columns: 1fr; }
  .contact-panel{ grid-template-columns: 1fr; padding: 32px; }
  .timeline{ grid-template-columns: 1fr; gap: 28px; }
  .timeline::before{ display: none; }
  .timeline-step{ display: flex; align-items: center; gap: 18px; text-align: left; }
  .timeline-icon{ margin: 0; flex-shrink: 0; }
  .timeline-step p{ margin: 0; }
}

@media (max-width: 768px){
  .main-nav, .header-cta{ display: none; }
  .nav-toggle{ display: flex; }
  .card-grid--3, .card-grid--4{ grid-template-columns: 1fr; }
  .section{ padding: 64px 0; }
  .form-row{ grid-template-columns: 1fr; }
}

@media (max-width: 480px){
  .container{ padding: 0 18px; }
  .hero h1{ font-size: 2rem; }
  .btn-lg{ width: 100%; }
  .hero-actions .btn{ width: 100%; }
  .visual-card--main{ margin-top: 24px; }
  .visual-card--float{ position: static; margin-top: 12px; width: fit-content; }
  .hero-visual{ display: flex; flex-direction: column; }
  .hero-network{ display: none; }
}