/* One Oak — AI Consulting (light) */

:root {
  --color-bg: #f5f7f5;
  --color-bg-alt: #eef1ee;
  --color-surface: #ffffff;
  --color-border: #dce2dc;
  --color-border-strong: #c2ccc2;
  --color-text: #1a1f1b;
  --color-text-muted: #5a655c;
  --color-accent: #2d6b3e;
  --color-accent-hover: #257033;
  --color-accent-subtle: rgba(45, 107, 62, 0.08);
  --color-accent-muted: rgba(45, 107, 62, 0.18);
  --color-focus-x: #c53030;
  --font-heading: "Fraunces", Georgia, serif;
  --font-body: "Plus Jakarta Sans", system-ui, sans-serif;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3.5rem;
  --space-2xl: 5rem;
  --radius: 6px;
  --radius-lg: 10px;
  --radius-pill: 9999px;
  --shadow-sm: 0 1px 3px rgba(26, 31, 27, 0.06);
  --shadow-md: 0 4px 16px rgba(26, 31, 27, 0.08), 0 1px 3px rgba(26, 31, 27, 0.04);
  --shadow-lg: 0 12px 40px rgba(26, 31, 27, 0.1);
  --transition: 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  position: relative;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.92' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.02'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 1;
  mix-blend-mode: multiply;
}

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

img {
  max-width: 100%;
  height: auto;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 101;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition), border-color var(--transition);
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-text);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
  transition: color var(--transition);
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 1px;
  background: currentColor;
  transition: width var(--transition);
}

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

.nav a:hover::after {
  width: 100%;
}

.nav-cta {
  color: var(--color-accent) !important;
  font-weight: 500;
}

.nav-cta::after {
  background: var(--color-accent);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text);
}

.menu-toggle span {
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition), border-color var(--transition);
  cursor: pointer;
  border: none;
  box-shadow: var(--shadow-sm);
}

.btn:active {
  transform: translateY(0);
}

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

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

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border-strong);
  box-shadow: none;
}

.btn-ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-subtle);
  transform: translateY(-1px);
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1rem;
}

/* Sections */
main {
  position: relative;
  z-index: 2;
}

.section {
  padding: clamp(var(--space-xl), 6vw, var(--space-2xl)) var(--space-lg);
  position: relative;
}

.section:nth-child(even) {
  background: var(--color-bg-alt);
}

.container {
  max-width: min(680px, 92vw);
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.625rem, 3.5vw, 2.25rem);
  font-weight: 600;
  margin: 0 0 var(--space-lg);
  letter-spacing: -0.03em;
  line-height: 1.2;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.section-title span {
  padding-left: var(--space-sm);
  border-left: 3px solid var(--color-accent);
}

/* Card block */
.card {
  padding: var(--space-lg);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.card:hover {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-md);
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(80px + var(--space-xl)) var(--space-lg) var(--space-xl);
  position: relative;
  overflow: hidden;
  z-index: 2;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 50% at 50% 0%, var(--color-accent-subtle) 0%, transparent 55%),
    linear-gradient(180deg, transparent 0%, var(--color-bg) 80%);
  pointer-events: none;
}

.hero-noise {
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.025'/%3E%3C/svg%3E");
  pointer-events: none;
  mix-blend-mode: multiply;
}

.hero-content {
  position: relative;
  text-align: center;
  max-width: 680px;
}

.hero-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  margin: 0 0 var(--space-md);
  opacity: 0;
  animation: fadeUp 0.6s var(--ease-out) forwards;
  position: relative;
  display: inline-block;
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--color-accent-muted);
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.625rem, 7.5vw, 4rem);
  font-weight: 700;
  line-height: 1.08;
  margin: 0 0 var(--space-md);
  letter-spacing: -0.045em;
  opacity: 0;
  animation: fadeUp 0.6s var(--ease-out) 0.08s forwards;
  color: var(--color-text);
}

.hero-sub {
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--color-text-muted);
  margin: 0 0 var(--space-lg);
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
  opacity: 0;
  animation: fadeUp 0.6s var(--ease-out) 0.16s forwards;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
  opacity: 0;
  animation: fadeUp 0.6s var(--ease-out) 0.24s forwards;
}

.hero-ctas .btn {
  min-width: 200px;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Philosophy */
.philosophy .lead {
  font-size: 1.2rem;
  color: var(--color-text);
  margin: 0 0 var(--space-md);
}

.philosophy-content p {
  margin: 0 0 var(--space-md);
  color: var(--color-text-muted);
}

.philosophy .card {
  margin-bottom: var(--space-lg);
}

.philosophy .btn {
  margin-top: 0;
}

/* Services */
.services-hero.card {
  margin-bottom: var(--space-lg);
}

.services-headline {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 var(--space-md);
}

.services-hero p {
  margin: 0 0 var(--space-md);
  color: var(--color-text-muted);
}

/* Focus */
.focus-intro {
  margin: 0 0 var(--space-md);
  color: var(--color-text-muted);
}

.focus-intro em {
  color: var(--color-accent);
  font-style: italic;
  font-weight: 600;
}

.focus-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.focus-list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: var(--space-xs) var(--space-md);
  padding-left: var(--space-sm);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}

.focus-list li:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-strong);
  transform: translateY(-1px);
}

.focus-list li::before {
  content: "✕";
  flex-shrink: 0;
  width: 1.125rem;
  color: var(--color-focus-x);
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1;
  text-align: center;
}

/* Calendly embed */
.calendly-embed-wrap {
  margin: var(--space-md) 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  height: 650px;
}

.calendly-embed-wrap .calendly-inline-widget {
  width: 100% !important;
  height: 100% !important;
  min-height: 0 !important;
  overflow: hidden;
}

.calendly-embed-wrap iframe {
  overflow: hidden !important;
}

/* Schedule */
.schedule-subtitle {
  font-size: 1.1rem;
  color: var(--color-accent);
  margin: 0 0 var(--space-sm);
}

.schedule-desc {
  color: var(--color-text-muted);
  margin: 0 0 var(--space-lg);
}

.schedule-perfect {
  margin-top: var(--space-xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
}

.schedule-perfect h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 var(--space-md);
}

.schedule-perfect ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.schedule-perfect li {
  padding: var(--space-sm) 0;
  padding-left: 1.75rem;
  position: relative;
  color: var(--color-text-muted);
}

.schedule-perfect li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.3rem;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--color-accent);
}

/* Case study */
.case-study {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
}

.case-study-card.card {
  padding: var(--space-xl);
}

.case-study h3 {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 600;
  margin: 0 0 var(--space-sm);
}

.case-study p {
  color: var(--color-text-muted);
  margin: 0 0 var(--space-md);
}

/* Contact */
.section.contact {
  background: var(--color-bg-alt);
}

.contact-container {
  max-width: min(680px, 92vw);
}

.contact-block.card {
  padding: var(--space-xl);
}

.contact-intro {
  margin: 0 0 var(--space-md);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
}

.contact .btn {
  margin-top: 0;
}

/* Footer */
.site-footer {
  padding: var(--space-lg) var(--space-lg);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  position: relative;
  z-index: 2;
}

.footer-container {
  max-width: min(680px, 92vw);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.footer-brand {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0;
  color: var(--color-text);
}

.footer-legal {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.footer-links a {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.footer-links a:hover {
  color: var(--color-text);
}

/* Scroll-triggered fade (optional enhancement) */
.section .section-title,
.section .container > * {
  transition: opacity 0.5s ease, transform 0.5s ease;
}

/* Mobile */
@media (max-width: 768px) {
  html {
    scroll-padding-top: 4.5rem;
  }

  .site-header {
    padding: var(--space-sm) var(--space-md);
  }

  .logo {
    font-size: 1.25rem;
  }

  .menu-toggle {
    display: flex;
    min-width: 44px;
    min-height: 44px;
    align-items: center;
    justify-content: center;
    margin: -0.5rem 0;
  }

  .nav {
    position: fixed;
    top: 52px;
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    padding: var(--space-lg) var(--space-md);
    padding-top: var(--space-md);
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .nav a {
    font-size: 1rem;
    padding: var(--space-md) 0;
    min-height: 48px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--color-border);
  }

  .nav a:last-child {
    border-bottom: none;
  }

  .nav a::after {
    display: none;
  }

  .nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  body.menu-open {
    overflow: hidden;
  }

  main {
    padding-top: 0;
  }

  .section {
    padding: var(--space-xl) var(--space-md);
  }

  .container,
  .contact-container,
  .footer-container {
    max-width: none;
    padding: 0;
  }

  .section-title {
    font-size: 1.5rem;
    margin-bottom: var(--space-md);
  }

  .section-title span {
    padding-left: var(--space-sm);
  }

  .card {
    padding: var(--space-md);
  }

  .hero {
    min-height: 100dvh;
    min-height: 100vh;
    padding: calc(52px + var(--space-lg)) var(--space-md) var(--space-xl);
  }

  .hero-content {
    max-width: none;
  }

  .hero-label {
    font-size: 0.7rem;
    letter-spacing: 0.15em;
  }

  .hero-title {
    font-size: clamp(2rem, 10vw, 2.75rem);
    margin-bottom: var(--space-sm);
  }

  .hero-sub {
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: var(--space-md);
    padding: 0 var(--space-xs);
  }

  .hero-ctas {
    flex-direction: column;
    gap: var(--space-sm);
    width: 100%;
  }

  .hero-ctas .btn {
    width: 100%;
    min-width: 0;
    min-height: 48px;
    padding: 0.875rem 1.25rem;
  }

  .philosophy .lead,
  .services-hero p,
  .philosophy-content p {
    font-size: 1rem;
  }

  .focus-list {
    gap: var(--space-xs);
  }

  .focus-list li {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    font-size: 0.75rem;
  }

  .calendly-embed-wrap {
    margin: var(--space-sm) 0;
    border-radius: var(--radius);
    height: 580px;
  }

  .schedule-perfect {
    margin-top: var(--space-lg);
    padding-top: var(--space-lg);
  }

  .schedule-perfect h3 {
    font-size: 1.125rem;
  }

  .schedule-perfect li {
    padding-left: 1.5rem;
    font-size: 0.9375rem;
  }

  .schedule-perfect li::before {
    top: 1.15rem;
  }

  .case-study-card.card {
    padding: var(--space-lg);
  }

  .contact-block.card {
    padding: var(--space-md);
  }

  .contact .btn,
  .philosophy .btn,
  .services .btn {
    width: 100%;
    min-height: 48px;
    justify-content: center;
  }

  .site-footer {
    padding: var(--space-md) var(--space-md);
  }

  .footer-container {
    flex-direction: column;
    text-align: center;
    gap: var(--space-sm);
  }

  .footer-links {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .footer-links a {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
}

/* Small phones */
@media (max-width: 480px) {
  .hero-title {
    font-size: clamp(1.75rem, 9vw, 2.5rem);
  }

  .section-title {
    font-size: 1.375rem;
  }

  .calendly-embed-wrap {
    height: 520px;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .section {
    opacity: 1 !important;
    transform: none !important;
  }
}