/* ============================================
   TrainAgentAI — Design System
   Token system: warm paper background, ink text,
   indigo primary, citrus tag-yellow, coral accent.
   Typeface: Poppins, semibold throughout
   ============================================ */

:root {
  /* Color tokens */
  --paper: #FAF7F0;
  --paper-dim: #F1ECE0;
  --ink: #1A1A2E;
  --ink-soft: #4A4A5E;
  --black: #000000;
  --indigo: #5B4FE8;
  --indigo-deep: #423AC2;
  --yellow: #FFD23F;
  --coral: #FF6B5B;
  --green-tag: #1FAE6B;
  --line: #E5DFD0;
  --white: #FFFFFF;

  /* Type */
  --font-display: 'Poppins', sans-serif;
  --font-body: 'Poppins', sans-serif;
  --font-mono: 'Poppins', sans-serif;

  /* Scale */
  --radius-sm: 0px;
  --radius-md: 0px;
  --radius-lg: 0px;
  --radius-full: 999px;

  --shadow-sm: 0 2px 8px rgba(26,26,46,0.06);
  --shadow-md: 0 8px 24px rgba(26,26,46,0.10);
  --shadow-lg: 0 16px 48px rgba(26,26,46,0.14);

  --maxw: 1240px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  font-size: 70%;
}

body {
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.5;
  font-weight: 600;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

ul { list-style: none; }

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

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 32px;
}

@media (max-width: 640px) {
  .wrap { padding: 0 20px; }
}

/* ============ Typography ============ */

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.08;
}

.display-1 {
  font-size: clamp(2.6rem, 6vw, 5.2rem);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.display-2 {
  font-size: clamp(2.1rem, 4.4vw, 3.6rem);
  font-weight: 600;
}

.display-3 {
  font-size: clamp(1.6rem, 2.8vw, 2.3rem);
  font-weight: 600;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--indigo-deep);
  background: rgba(91,79,232,0.08);
  padding: 7px 14px 7px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 20px;
  position: relative;
}

.eyebrow::before {
  content: '⌐';
  font-weight: 700;
}

.lede {
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  color: var(--ink-soft);
  max-width: 640px;
  line-height: 1.55;
}

.body-lg { font-size: 1.125rem; line-height: 1.6; color: var(--ink-soft); }

/* ============ Buttons ============ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.98rem;
  padding: 14px 26px;
  border-radius: var(--radius-sm);
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--ink);
  color: var(--paper);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

.btn-accent {
  background: var(--coral);
  color: var(--white);
}
.btn-accent:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(255,107,91,0.4); }

.btn-outline {
  background: transparent;
  color: var(--ink);
  border: 1.5px solid var(--ink);
}
.btn-outline:hover { background: var(--ink); color: var(--paper); }

.btn-ghost {
  background: transparent;
  color: var(--ink);
  padding: 14px 18px;
}
.btn-ghost:hover { color: var(--indigo); }

.btn-sm { padding: 10px 18px; font-size: 0.88rem; }

.btn-row { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }

/* ============ Nav ============ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250,247,240,0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 32px;
  max-width: var(--maxw);
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.22rem;
  color: var(--ink);
}

.logo-mark {
  width: 30px;
  height: 30px;
  border-radius: 0;
  background: var(--black);
  border: 1px solid rgba(250,247,240,0.18);
  position: relative;
  flex-shrink: 0;
  box-sizing: border-box;
}
.logo-mark::before, .logo-mark::after {
  content: '';
  position: absolute;
}
.logo-mark::before {
  width: 13px; height: 13px;
  border: 1.6px solid var(--white);
  top: 6px; left: 6px;
}
.logo-mark::after {
  width: 6px; height: 6px;
  background: var(--white);
  bottom: 5px; right: 5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.96rem;
  font-weight: 600;
  transition: background 0.15s ease;
}
.nav-link:hover { background: var(--paper-dim); }

.nav-caret { font-size: 0.6rem; opacity: 0.6; transform: translateY(1px); }

.nav-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 10px;
  width: 240px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: all 0.18s ease;
}

.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown a {
  display: block;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  color: var(--ink-soft);
}
.nav-dropdown a:hover { background: var(--paper-dim); color: var(--ink); }

/* ============ Modern rich dropdown (Platform mega-menu) ============ */

.nav-dropdown-rich {
  width: 320px;
  padding: 8px;
  border: 1px solid var(--line);
}

.nav-rich-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 12px;
  border-radius: var(--radius-sm);
  transition: background 0.15s ease, transform 0.15s ease;
}

.nav-rich-item:hover {
  background: var(--paper-dim);
  transform: translateX(2px);
}

.nav-rich-icon {
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: #fff;
  border-radius: 0;
}

.nav-rich-text {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.nav-rich-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--ink);
  line-height: 1.3;
}

.nav-rich-desc {
  font-size: 0.78rem;
  color: var(--ink-soft);
  line-height: 1.4;
}

.nav-right { display: flex; align-items: center; gap: 6px; }

.nav-toggle {
  display: none;
  width: 38px; height: 38px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
}

@media (max-width: 920px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav-right .btn-ghost { display: none; }
}

/* Mobile menu */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--paper);
  z-index: 200;
  padding: 24px 28px;
  overflow-y: auto;
}
.mobile-menu.open { display: block; }
.mobile-menu-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 32px; }
.mobile-menu a {
  display: block;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.mobile-close { width: 38px; height: 38px; }

/* ============ Section scaffolding ============ */

.section { padding: 100px 0; position: relative; }
.section-tight { padding: 64px 0; }

@media (max-width: 760px) {
  .section { padding: 64px 0; }
}

.section-head {
  max-width: 720px;
  margin-bottom: 56px;
}
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }

.bg-ink { background: var(--ink); color: var(--paper); }
.bg-ink .ink-soft-on-dark { color: rgba(250,247,240,0.7); }
.bg-indigo { background: var(--indigo); color: var(--white); }
.bg-dim { background: var(--paper-dim); }
.bg-coral { background: var(--coral); color: var(--white); }
.bg-white { background: var(--white); }

/* ============ Tag chips (signature motif) ============ */

.tag-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 600;
  padding: 5px 11px;
  border-radius: 0;
  letter-spacing: 0.02em;
}
.tag-yellow { background: var(--yellow); color: var(--ink); }
.tag-coral { background: var(--coral); color: var(--white); }
.tag-indigo { background: var(--indigo); color: var(--white); }
.tag-green { background: var(--green-tag); color: var(--white); }
.tag-outline { background: transparent; border: 1.5px dashed var(--ink-soft); color: var(--ink-soft); }

/* corner-bracket frame used around hero / signature visuals */
.bracket-frame {
  position: relative;
  border-radius: var(--radius-lg);
}
.bracket-frame::before,
.bracket-frame::after {
  content: '';
  position: absolute;
  width: 28px;
  height: 28px;
  border: 3px solid var(--ink);
  opacity: 0.85;
}
.bracket-frame::before {
  top: -10px; left: -10px;
  border-right: none; border-bottom: none;
  border-radius: 0;
}
.bracket-frame::after {
  bottom: -10px; right: -10px;
  border-left: none; border-top: none;
  border-radius: 0;
}

/* ============ Cards ============ */

.card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 32px;
  border: 1px solid var(--line);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

.card-icon {
  width: 46px; height: 46px;
  border-radius: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 18px;
}

.card-icon-sm {
  width: 32px; height: 32px;
  font-size: 1rem;
  margin-bottom: 14px;
}

.grid {
  display: grid;
  gap: 24px;
}
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 920px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 620px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* ============ Stats ============ */

.stat-num {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  font-weight: 700;
  color: var(--indigo);
  line-height: 1;
}
.stat-label {
  font-size: 0.92rem;
  color: var(--ink-soft);
  margin-top: 6px;
}

/* ============ Logo strip / marquee ============ */

.logo-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
  flex-wrap: wrap;
  opacity: 0.55;
}
.logo-strip span {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  white-space: nowrap;
}

.logo-marquee {
  overflow: hidden;
  position: relative;
  width: 100%;
  mask-image: linear-gradient(to right, transparent, var(--ink) 8%, var(--ink) 92%, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, var(--ink) 8%, var(--ink) 92%, transparent);
}

.logo-marquee-track {
  display: flex;
  align-items: center;
  gap: 56px;
  width: max-content;
  opacity: 0.55;
  animation: marquee-scroll 28s linear infinite;
}

.logo-marquee:hover .logo-marquee-track {
  animation-play-state: paused;
}

.logo-marquee-track span {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  white-space: nowrap;
  flex-shrink: 0;
}

@keyframes marquee-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

@media (prefers-reduced-motion: reduce) {
  .logo-marquee-track { animation: none; }
}

/* ============ Footer ============ */

.site-footer {
  background: var(--black);
  color: rgba(250,247,240,0.85);
  padding: 80px 0 32px;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 56px;
  border-bottom: 1px solid rgba(250,247,240,0.12);
}
.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: rgba(250,247,240,0.5);
  margin-bottom: 16px;
  font-weight: 600;
}
.footer-col a {
  display: block;
  padding: 7px 0;
  color: rgba(250,247,240,0.8);
  font-size: 0.94rem;
}
.footer-col a:hover { color: var(--paper); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 28px;
  font-size: 0.86rem;
  color: rgba(250,247,240,0.5);
  flex-wrap: wrap;
  gap: 12px;
}
@media (max-width: 860px) {
  .footer-top { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .footer-top { grid-template-columns: 1fr; }
}

/* ============ Misc utility ============ */

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-12 { gap: 12px; }
.gap-20 { gap: 20px; }
.mt-12 { margin-top: 12px; }
.mt-24 { margin-top: 24px; }
.mt-40 { margin-top: 40px; }
.text-center { text-align: center; }

.pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-full);
  padding: 8px 16px;
  font-size: 0.86rem;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.divider-dash {
  border: none;
  border-top: 2px dashed var(--line);
  margin: 0;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}

/* Focus visibility */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible {
  outline: 2.5px solid var(--indigo);
  outline-offset: 2px;
  border-radius: 6px;
}

/* ============ Scroll reveal ============ */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.revealed { opacity: 1; transform: translateY(0); }

.active-link { background: var(--paper-dim); font-weight: 700; }

/* ============ Hero pipeline signature element (static) ============ */
.flow-diagram {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 40px 40px 32px;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.flow-steps {
  display: flex;
  flex-direction: column;
  margin-top: 24px;
}

.flow-step {
  display: flex;
  gap: 18px;
  position: relative;
}

.flow-node {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.92rem;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.flow-line {
  position: absolute;
  left: 17px;
  top: 34px;
  width: 2px;
  height: calc(100% - 8px);
  background: var(--line);
}

.flow-body { padding-bottom: 26px; }
.flow-step:last-child .flow-body { padding-bottom: 0; }

.flow-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 4px;
  line-height: 1.3;
}

.flow-desc {
  font-size: 0.86rem;
  color: var(--ink-soft);
  line-height: 1.55;
}

.flow-caption {
  margin-top: 22px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
  line-height: 1.5;
}

/* ============ Login page split layout ============ */

.login-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: stretch;
}

.login-split-visual { order: 1; }
.login-split-form { order: 2; }

.login-split-visual .flow-diagram,
.login-split-form .login-card {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  box-sizing: border-box;
}

@media (max-width: 900px) {
  .login-split {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .login-split-visual { order: 2; }
  .login-split-form { order: 1; }
}

/* ============ Back to home watermark ============ */

.back-home-row {
  display: flex;
  justify-content: flex-end;
  padding-top: 12px;
}

.back-home-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  opacity: 0.5;
  padding: 4px 2px;
  transition: opacity 0.18s ease, color 0.18s ease;
}

.back-home-link:hover {
  opacity: 1;
  color: var(--indigo-deep);
}

/* ============ Platforms hub page ============ */

.platform-anchor {
  scroll-margin-top: 90px;
}

.platform-jump-card {
  display: block;
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.platform-jump-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* ============ Contact page — equal-weight right column ============ */

.contact-card-equal {
  padding: 36px;
  display: flex;
  flex-direction: column;
}

.contact-row {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding-bottom: 22px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--line);
}

.contact-row-last {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: none;
}

.contact-row .nav-rich-icon {
  margin-top: 2px;
}

.contact-email {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--indigo-deep);
  font-weight: 600;
  text-decoration: none;
}

.contact-email:hover { text-decoration: underline; }

/* ============ Contact page — equal column alignment ============ */

.contact-grid-equal {
  display: grid;
  align-items: start;
}

.contact-col {
  display: flex;
  flex-direction: column;
}

.contact-col-intro {
  min-height: 200px;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}

@media (max-width: 760px) {
  .contact-col-intro { min-height: 0; }
}