/*
 * Design Brief: Synvoro ← inspired by https://synoro.ai/
 *
 * Structure: header → hero-split → platform-stack → how-it-works (4-step)
 *   → platform-grid → agent-team → tech-vision → cta-band → footer
 * Layout types: hero-split, vertical-stack-interactive, process-steps,
 *   feature-mosaic, agent-orbit, statement-split, cta-typography-band, footer-columns
 *
 * Hero: split 50/50, typography-dominant left, layered stack visual right
 * Background: light off-white bands alternating with subtle mint tint
 * Motion: fade-up reveals, 0.6s ease-out, stagger 0.1s; stack layer hover lift
 *
 * Tokens derived from synoro.ai — light enterprise accounting OS aesthetic:
 *   clean sans, teal accent, numbered labels, restrained motion
 */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&family=Instrument+Serif:ital@0;1&display=swap');

:root {
  --color-bg: #f8f9f8;
  --color-bg-alt: #eef3f1;
  --color-bg-dark: #0c1412;
  --color-surface: #ffffff;
  --color-surface-elevated: #ffffff;
  --color-text: #111816;
  --color-text-muted: #5c6b66;
  --color-text-on-dark: #e8eeec;
  --color-text-muted-on-dark: #9aaba4;
  --color-accent: #147a6e;
  --color-accent-hover: #0f6359;
  --color-accent-soft: rgba(20, 122, 110, 0.1);
  --color-accent-border: rgba(20, 122, 110, 0.25);
  --color-highlight: #c4a962;
  --color-border: #dde4e1;
  --color-border-strong: #c5d0cb;

  --font-display: 'DM Sans', system-ui, sans-serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
  --font-serif: 'Instrument Serif', Georgia, serif;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-pill: 999px;

  --space-section: clamp(4rem, 8vw, 7rem);
  --space-grid: clamp(1.5rem, 3vw, 2.5rem);
  --content-max: 1200px;
  --content-narrow: 720px;

  --shadow-sm: 0 1px 3px rgba(12, 20, 18, 0.06);
  --shadow-md: 0 8px 32px rgba(12, 20, 18, 0.08);
  --shadow-lg: 0 24px 64px rgba(12, 20, 18, 0.12);

  --transition-base: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-reveal: 0.65s cubic-bezier(0.22, 1, 0.36, 1);

  --header-height: 72px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-base);
}

a:hover {
  color: var(--color-accent-hover);
}

button {
  font-family: inherit;
  cursor: pointer;
}

.container {
  width: min(100% - 2.5rem, var(--content-max));
  margin-inline: auto;
}

.container--narrow {
  width: min(100% - 2.5rem, var(--content-narrow));
  margin-inline: auto;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1rem;
}

.section-label__num {
  font-variant-numeric: tabular-nums;
  opacity: 0.7;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.025em;
  margin: 0 0 1.25rem;
}

.section-title em {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  color: var(--color-accent);
}

.section-desc {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 42rem;
  margin: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  border: 1.5px solid transparent;
  transition: background var(--transition-base), color var(--transition-base),
    border-color var(--transition-base), transform var(--transition-base),
    box-shadow var(--transition-base);
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border-strong);
}

.btn--secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-on-dark);
  border-color: rgba(255, 255, 255, 0.35);
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.6);
}

.btn--light {
  background: #fff;
  color: var(--color-bg-dark);
  border-color: #fff;
}

.btn--light:hover {
  background: var(--color-bg-alt);
  transform: translateY(-1px);
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.site-header.is-scrolled {
  background: rgba(248, 249, 248, 0.92);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  color: var(--color-text);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
}

.site-logo:hover {
  color: var(--color-text);
}

.site-logo__mark {
  width: 32px;
  height: 32px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.site-nav__links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav__links a {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  font-weight: 500;
}

.site-nav__links a:hover {
  color: var(--color-text);
}

.site-nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
  background: none;
  border: none;
}

.site-nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.site-nav__toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-nav__toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.site-nav__toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Hero — split */
.hero {
  padding-top: calc(var(--header-height) + 2rem);
  padding-bottom: var(--space-section);
  background: var(--color-bg);
  overflow: hidden;
}

.hero--split .hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-grid);
  align-items: center;
  min-height: min(85vh, 820px);
}

.hero__eyebrow {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 1rem;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5.5vw, 4rem);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin: 0 0 1.5rem;
}

.hero__title span {
  display: block;
}

.hero__subtitle {
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  color: var(--color-text-muted);
  max-width: 32rem;
  margin: 0 0 2rem;
  line-height: 1.7;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.875rem;
}

.hero__visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-stack {
  width: 100%;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.hero-stack__layer {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.875rem 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base),
    border-color var(--transition-base);
}

.hero-stack__layer:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent-border);
}

.hero-stack__layer-num {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-accent);
  min-width: 1.5rem;
}

.hero-stack__layer-title {
  font-size: 0.875rem;
  font-weight: 600;
  margin: 0;
}

/* Platform stack — interactive vertical stack */
.platform-stack {
  padding-block: var(--space-section);
  background: var(--color-bg-alt);
}

.platform-stack__header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.platform-stack__layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 3rem;
  align-items: start;
}

.stack-nav {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  position: sticky;
  top: calc(var(--header-height) + 1.5rem);
}

.stack-nav__btn {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  text-align: left;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  transition: background var(--transition-base), border-color var(--transition-base);
}

.stack-nav__btn:hover,
.stack-nav__btn.is-active {
  background: var(--color-surface);
  border-color: var(--color-border);
}

.stack-nav__btn.is-active {
  border-color: var(--color-accent-border);
  box-shadow: var(--shadow-sm);
}

.stack-nav__num {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-accent);
  min-width: 1.25rem;
}

.stack-nav__label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.35;
}

.stack-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
  min-height: 280px;
}

.stack-panel__content {
  display: none;
}

.stack-panel__content.is-active {
  display: block;
  animation: panelFadeIn 0.4s ease-out;
}

.stack-panel__content h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.stack-panel__content p {
  color: var(--color-text-muted);
  margin: 0;
  font-size: 1.0625rem;
  line-height: 1.7;
}

.stack-panel__hint {
  margin-top: 2rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  font-style: italic;
}

@keyframes panelFadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* How it works — process steps */
.how-it-works {
  padding-block: var(--space-section);
  background: var(--color-bg);
}

.how-it-works__header {
  max-width: 38rem;
  margin-bottom: 3.5rem;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  counter-reset: step;
}

.process-step {
  position: relative;
  padding: 1.75rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.process-step:hover {
  border-color: var(--color-accent-border);
  box-shadow: var(--shadow-md);
}

.process-step__num {
  display: block;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 1rem;
}

.process-step__title {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0 0 0.625rem;
  letter-spacing: -0.01em;
}

.process-step__desc {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.6;
}

/* Platform overview — feature mosaic */
.platform-overview {
  padding-block: var(--space-section);
  background: var(--color-bg-dark);
  color: var(--color-text-on-dark);
}

.platform-overview .section-label {
  color: var(--color-highlight);
}

.platform-overview .section-desc {
  color: var(--color-text-muted-on-dark);
}

.feature-mosaic {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-top: 3rem;
}

.feature-mosaic__item {
  padding: 1.75rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  transition: background var(--transition-base), border-color var(--transition-base),
    transform var(--transition-base);
}

.feature-mosaic__item:hover {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(20, 122, 110, 0.4);
  transform: translateY(-3px);
}

.feature-mosaic__item h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
}

.feature-mosaic__item p {
  font-size: 0.9375rem;
  color: var(--color-text-muted-on-dark);
  margin: 0;
  line-height: 1.55;
}

.feature-mosaic__icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-soft);
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  color: var(--color-accent);
  font-size: 1.125rem;
  font-weight: 700;
}

.platform-overview__cta {
  margin-top: 2.5rem;
}

/* Capabilities — agent team orbit */
.capabilities {
  padding-block: var(--space-section);
  background: var(--color-bg);
}

.capabilities__layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 4rem;
  align-items: center;
}

.agent-orbit {
  position: relative;
  width: 100%;
  max-width: 480px;
  aspect-ratio: 1;
  margin-inline: auto;
}

.agent-orbit__center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 140px;
  padding: 1.25rem;
  background: var(--color-surface);
  border: 2px solid var(--color-accent);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-lg);
  z-index: 2;
}

.agent-orbit__center h3 {
  font-size: 0.875rem;
  font-weight: 700;
  margin: 0;
  color: var(--color-accent);
}

.agent-orbit__center p {
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  margin: 0.25rem 0 0;
}

.agent-node {
  position: absolute;
  width: 96px;
  padding: 0.875rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base),
    border-color var(--transition-base);
  cursor: default;
}

.agent-node:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent-border);
}

.agent-node__abbr {
  display: block;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 0.25rem;
}

.agent-node__name {
  display: block;
  font-size: 0.6875rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text);
}

.agent-node--1 { top: 5%; left: 50%; transform: translateX(-50%); }
.agent-node--2 { top: 22%; right: 2%; }
.agent-node--3 { bottom: 22%; right: 2%; }
.agent-node--4 { bottom: 5%; left: 50%; transform: translateX(-50%); }
.agent-node--5 { bottom: 22%; left: 2%; }
.agent-node--6 { top: 22%; left: 2%; }

.agent-node--1:hover,
.agent-node--4:hover { transform: translateX(-50%) scale(1.05); }

.capabilities__list {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.capabilities__list li {
  display: flex;
  gap: 0.875rem;
  align-items: flex-start;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.capabilities__list li::before {
  content: '';
  flex-shrink: 0;
  width: 6px;
  height: 6px;
  margin-top: 0.55rem;
  background: var(--color-accent);
  border-radius: 50%;
}

/* Technology — statement split */
.technology {
  padding-block: var(--space-section);
  background: var(--color-bg-alt);
}

.technology__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.tech-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.tech-stat {
  padding: 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.tech-stat__value {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 0.375rem;
}

.tech-stat__label {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin: 0;
}

.technology__actions {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.875rem;
}

/* CTA band */
.cta-band {
  padding-block: var(--space-section);
  background: var(--color-bg-dark);
  text-align: center;
}

.cta-band__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--color-text-on-dark);
  margin: 0 0 1rem;
  max-width: 16ch;
  margin-inline: auto;
}

.cta-band__title em {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  color: var(--color-highlight);
}

.cta-band__desc {
  font-size: 1.125rem;
  color: var(--color-text-muted-on-dark);
  max-width: 36rem;
  margin: 0 auto 2rem;
}

.cta-band__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.875rem;
}

/* Footer */
.site-footer {
  padding-block: 4rem 2rem;
  background: #080e0c;
  color: var(--color-text-muted-on-dark);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.site-footer .site-logo img {
  filter: brightness(0) invert(1);
}

.site-footer__brand p {
  font-size: 0.9375rem;
  line-height: 1.65;
  margin: 1rem 0 0;
  max-width: 22rem;
}

.site-footer__col h4 {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-on-dark);
  margin: 0 0 1rem;
}

.site-footer__col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.site-footer__col a {
  color: var(--color-text-muted-on-dark);
  font-size: 0.9375rem;
}

.site-footer__col a:hover {
  color: var(--color-text-on-dark);
}

.site-footer__email a {
  color: var(--color-accent);
  font-weight: 500;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.8125rem;
}

/* Modals */
.modal[hidden] {
  display: none;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(8, 14, 12, 0.6);
  backdrop-filter: blur(4px);
}

.modal__panel {
  position: relative;
  width: min(100%, 520px);
  max-height: min(85vh, 640px);
  overflow-y: auto;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-lg);
}

.modal__close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-alt);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1.25rem;
  line-height: 1;
  color: var(--color-text-muted);
  transition: background var(--transition-base), color var(--transition-base);
}

.modal__close:hover {
  background: var(--color-border);
  color: var(--color-text);
}

.modal__panel h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
  padding-right: 2rem;
}

.modal__panel p {
  color: var(--color-text-muted);
  margin: 0 0 1rem;
  line-height: 1.65;
}

.modal__panel ul {
  margin: 0 0 1rem;
  padding-left: 1.25rem;
  color: var(--color-text-muted);
}

.modal__panel li {
  margin-bottom: 0.375rem;
}

.modal__actions {
  margin-top: 1.5rem;
}

/* Policy pages */
.page-header {
  padding-top: calc(var(--header-height) + 3rem);
  padding-bottom: 2rem;
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 600;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.page-header p {
  color: var(--color-text-muted);
  margin: 0;
}

.policy-content {
  padding-block: 3rem 4rem;
}

.policy-content h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 2rem 0 0.75rem;
}

.policy-content p,
.policy-content li {
  color: var(--color-text-muted);
  line-height: 1.7;
}

.policy-content ul {
  padding-left: 1.25rem;
}