/* Deepthinker — modern product site */

:root {
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-text: #0f172a;
  --color-muted: #64748b;
  --color-border: #e2e8f0;
  --color-accent: #2563eb;
  --color-accent-dark: #1d4ed8;
  --color-accent-soft: #eff6ff;
  --color-dark: #0b1220;
  --font-sans: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(15, 23, 42, 0.08);
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
  --header-height: 72px;
  --max-width: 1140px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

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

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

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

.container {
  width: min(100% - 2rem, var(--max-width));
  margin-inline: auto;
}

.section {
  padding: 5rem 0;
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 3rem;
}

.section-header h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-header p {
  margin: 0;
  color: var(--color-muted);
  font-size: 1.05rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  gap: 1rem;
}

.site-logo img {
  height: 44px;
  width: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.site-nav a {
  color: var(--color-text);
  font-size: 0.9375rem;
  font-weight: 500;
  padding: 0.5rem 0.875rem;
  border-radius: 8px;
  transition: background 0.2s, color 0.2s;
}

.site-nav a:hover,
.site-nav a.is-active {
  background: var(--color-accent-soft);
  color: var(--color-accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: 0.5rem;
  cursor: pointer;
  color: var(--color-text);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  margin: 5px 0;
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: 10px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.15s;
}

.btn:hover {
  transform: translateY(-1px);
}

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

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

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

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

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

/* Hero */
.hero {
  padding: 5rem 0 4rem;
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(37, 99, 235, 0.12), transparent),
    var(--color-bg);
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}

.hero__badge {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-size: 0.8125rem;
  font-weight: 600;
  border-radius: 999px;
  margin-bottom: 1rem;
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
  font-weight: 800;
}

.hero__lead {
  margin: 0 0 1.75rem;
  font-size: 1.125rem;
  color: var(--color-muted);
  max-width: 540px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero__image {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  object-fit: cover;
}

.hero__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.hero__stat strong {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-accent);
}

.hero__stat span {
  font-size: 0.8125rem;
  color: var(--color-muted);
}

/* Products */
.products {
  background: var(--color-surface);
}

.product-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  padding: 3rem 0;
  border-bottom: 1px solid var(--color-border);
}

.product-block:last-child {
  border-bottom: none;
}

.product-block--reverse .product-block__content {
  order: 2;
}

.product-block--reverse .product-block__media {
  order: 1;
}

.product-block__tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.product-block h3 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.product-block__tagline {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.01em;
}

.product-block__desc {
  margin: 0 0 1.25rem;
  color: var(--color-muted);
}

.product-block__placeholder-note {
  display: inline-block;
  margin-bottom: 1rem;
  padding: 0.35rem 0.75rem;
  background: #fef3c7;
  color: #92400e;
  font-size: 0.8125rem;
  font-weight: 600;
  border-radius: 6px;
}

.product-features {
  margin: 0 0 1.5rem;
  padding: 0;
  list-style: none;
}

.product-features li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--color-text);
  font-size: 0.9375rem;
}

.product-features li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
}

.product-features li.is-placeholder {
  color: var(--color-muted);
  font-style: italic;
}

.product-features li strong {
  font-weight: 600;
}

.product-block__media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  background: linear-gradient(135deg, #e2e8f0 0%, #cbd5e1 100%);
  aspect-ratio: 16 / 10;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
}

.product-block__media:has(.product-block__image) {
  padding: 0;
  background: none;
}

.product-block__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-block__media-label {
  color: var(--color-muted);
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.4;
}

.product-block__media-label span {
  display: block;
  font-size: 1.25rem;
  color: var(--color-text);
  margin-bottom: 0.25rem;
}

/* Work grid */
.work {
  background: var(--color-bg);
}

.work-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.work-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: transform 0.2s, box-shadow 0.2s;
}

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

.work-card__img {
  aspect-ratio: 420 / 280;
  overflow: hidden;
  background: var(--color-border);
}

.work-card__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.work-card__body {
  padding: 1.25rem;
}

.work-card__body h4 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  font-weight: 600;
}

.work-card__body p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.5;
}

/* Services */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.service-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.service-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}

.service-card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  border-radius: 10px;
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.service-card h4 {
  margin: 0 0 0.5rem;
  font-size: 1.0625rem;
}

.service-card p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--color-muted);
}

/* Experience & clients */
.experience {
  background: var(--color-surface);
}

.experience__inner {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 3rem;
  align-items: center;
}

.experience__number {
  font-size: 5rem;
  font-weight: 800;
  line-height: 1;
  color: var(--color-accent);
  letter-spacing: -0.04em;
}

.experience__number span {
  display: block;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-muted);
  letter-spacing: 0;
  margin-top: 0.5rem;
}

.clients {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: center;
  justify-content: center;
  margin-top: 2.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--color-border);
}

.clients img {
  height: 48px;
  width: auto;
  opacity: 0.7;
  filter: grayscale(100%);
  transition: opacity 0.2s, filter 0.2s;
}

.clients img:hover {
  opacity: 1;
  filter: none;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.about-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
}

.about-card h4 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.about-card p {
  margin: 0 0 0.75rem;
  font-size: 0.9375rem;
  color: var(--color-muted);
}

.about-card p:last-child {
  margin-bottom: 0;
}

.about-card strong {
  color: var(--color-text);
}

/* Contact */
.contact-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.contact-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
}

.contact-card__icon {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.contact-card a {
  display: block;
  color: var(--color-text);
  font-weight: 500;
  margin-bottom: 0.25rem;
}

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

.contact-form-wrap {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  max-width: 800px;
  margin: 0 auto;
}

.contact-form {
  display: grid;
  gap: 1rem;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
}

.form-group input,
.form-group textarea {
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font: inherit;
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

/* Footer */
.site-footer {
  background: var(--color-dark);
  color: #94a3b8;
  padding: 2.5rem 0;
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-footer p {
  margin: 0;
  font-size: 0.875rem;
}

.site-footer a {
  color: #cbd5e1;
}

.site-footer a:hover {
  color: #fff;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.875rem;
}

/* Legal / policy pages */
.legal-page {
  max-width: 720px;
  margin-inline: auto;
}

.legal-page h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.legal-meta {
  margin: 0 0 2.5rem;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

.legal-page section {
  margin-bottom: 2rem;
}

.legal-page h2 {
  margin: 0 0 0.75rem;
  font-size: 1.25rem;
  font-weight: 600;
}

.legal-page p {
  margin: 0 0 1rem;
  color: var(--color-text);
}

.legal-page ul {
  margin: 0 0 1rem;
  padding-left: 1.25rem;
}

.legal-page li {
  margin-bottom: 0.5rem;
}

.legal-page li:last-child {
  margin-bottom: 0;
}

.legal-contact {
  list-style: none;
  padding-left: 0;
}

.legal-disclaimer {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.875rem;
  color: var(--color-muted);
}

.site-nav .legal-back {
  font-weight: 600;
}

/* Inline form feedback */
.form-feedback {
  margin: 0 0 1rem;
  padding: 0.875rem 1rem;
  border-radius: 10px;
  font-size: 0.9375rem;
  line-height: 1.5;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity 0.25s, transform 0.25s;
}

.form-feedback:not([hidden]) {
  opacity: 1;
  transform: translateY(0);
}

.form-feedback.success {
  border-color: #86efac;
  background: #f0fdf4;
  color: #166534;
}

.form-feedback.error {
  border-color: #fca5a5;
  background: #fef2f2;
  color: #991b1b;
}

.form-feedback.sending {
  border-color: #93c5fd;
  background: #eff6ff;
  color: #1e40af;
}

/* Responsive */
@media (min-width: 768px) {
  .hero__inner {
    grid-template-columns: 1.1fr 0.9fr;
  }
}

@media (max-width: 900px) {
  .product-block,
  .product-block--reverse {
    grid-template-columns: 1fr;
  }

  .product-block--reverse .product-block__content,
  .product-block--reverse .product-block__media {
    order: unset;
  }

  .experience__inner {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-surface);
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.25s, opacity 0.25s;
  }

  .site-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .site-nav a {
    padding: 0.75rem 1rem;
  }

  .hero__stats {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .section {
    padding: 3.5rem 0;
  }
}