/* ==========================================================================
   Ruben Cardenes — AI & Computer Vision Consulting
   ========================================================================== */

:root {
  --color-bg: #0b0e14;
  --color-bg-alt: #11151d;
  --color-surface: #161b26;
  --color-surface-hover: #1c2230;
  --color-border: #262d3d;
  --color-text: #e8ebf1;
  --color-text-muted: #9aa4b8;
  --color-text-faint: #6b7488;
  --color-accent: #4fd1c5;
  --color-accent-strong: #38b8ac;
  --color-accent-soft: rgba(79, 209, 197, 0.12);
  --color-danger: #ef5b6a;

  --font-heading: 'Space Grotesk', 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;

  --max-width: 1120px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;

  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.28);
  --transition: 180ms ease;
}

@media (prefers-color-scheme: light) {
  :root {
    --color-bg: #f7f8fa;
    --color-bg-alt: #ffffff;
    --color-surface: #ffffff;
    --color-surface-hover: #f0f2f6;
    --color-border: #e3e6ec;
    --color-text: #171a21;
    --color-text-muted: #565f73;
    --color-text-faint: #8991a3;
    --color-accent: #0f9c8f;
    --color-accent-strong: #0b8074;
    --color-accent-soft: rgba(15, 156, 143, 0.1);
    --shadow-card: 0 4px 20px rgba(20, 24, 34, 0.06);
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  line-height: 1.15;
  font-weight: 600;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 96px 0;
}

.section-header {
  max-width: 640px;
  margin-bottom: 48px;
}

.eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.section-header h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin-bottom: 12px;
}

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

/* ---- Buttons ---- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), background var(--transition), border-color var(--transition), color var(--transition);
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--color-accent);
  color: #04211d;
}

.btn-primary:hover {
  background: var(--color-accent-strong);
}

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

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

.btn-block {
  width: 100%;
  justify-content: center;
}

/* ---- Nav ---- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--color-bg) 82%, transparent);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.nav-logo span {
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

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

.nav-cta {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  cursor: pointer;
  padding: 8px;
}

@media (max-width: 860px) {
  .nav-links {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
    padding: 8px 24px 16px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition), transform var(--transition);
  }

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

  .nav-links a {
    padding: 12px 0;
    width: 100%;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-cta .btn-secondary {
    display: none;
  }

  .nav-toggle {
    display: block;
  }
}

/* ---- Hero ---- */

.hero {
  padding: 72px 0 96px;
}

.hero .container {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 56px;
  align-items: center;
}

.hero-photo-wrap {
  position: relative;
  justify-self: center;
}

.hero-photo {
  width: 100%;
  max-width: 340px;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
}

.hero-eyebrow {
  color: var(--color-accent);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 20px;
}

.hero-lede {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  max-width: 52ch;
  margin-bottom: 28px;
}

.hero-bullets {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 32px;
}

.hero-bullets li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.hero-bullets svg {
  flex-shrink: 0;
  margin-top: 3px;
  color: var(--color-accent);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 28px;
}

.hero-social {
  display: flex;
  gap: 16px;
}

.hero-social a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.hero-social a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

@media (max-width: 860px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-bullets li,
  .hero-actions,
  .hero-social {
    justify-content: center;
  }

  .hero-photo {
    max-width: 260px;
  }
}

/* ---- Services ---- */

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

.service-card,
.domain-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: transform var(--transition), border-color var(--transition);
}

.service-card:hover,
.domain-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-accent);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--color-accent-soft);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.service-card h3,
.domain-card h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
}

.service-card p,
.domain-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: 18px;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  font-size: 0.78rem;
  font-weight: 500;
  padding: 5px 11px;
  border-radius: 999px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

@media (max-width: 960px) {
  .card-grid {
    grid-template-columns: 1fr;
  }
}

/* ---- Domains ---- */

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

@media (max-width: 960px) {
  .domain-grid {
    grid-template-columns: 1fr;
  }
}

/* ---- Projects ---- */

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: transform var(--transition), border-color var(--transition);
}

.project-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-accent);
}

.project-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.project-card h3 {
  font-size: 1.05rem;
}

.project-card p {
  color: var(--color-text-muted);
  font-size: 0.92rem;
  flex-grow: 1;
}

.project-link {
  color: var(--color-text-faint);
  transition: color var(--transition);
}

.project-link:hover {
  color: var(--color-accent);
}

.project-card.is-placeholder {
  border-style: dashed;
  opacity: 0.6;
}

.projects-cta {
  text-align: center;
}

/* ---- Track record ---- */

.track-record {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-number {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 6px;
}

.stat-label {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

@media (max-width: 720px) {
  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px 24px;
  }
}

/* ---- About ---- */

.about .container {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
  align-items: start;
}

.about-bio p {
  color: var(--color-text-muted);
  margin-bottom: 18px;
}

.about-fact-list {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.about-fact {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.about-fact-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-faint);
}

.about-fact-value {
  font-size: 0.98rem;
  font-weight: 500;
}

@media (max-width: 860px) {
  .about .container {
    grid-template-columns: 1fr;
  }
}

/* ---- Contact ---- */

.contact .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-info-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.contact-info-item .card-icon {
  margin-bottom: 0;
  flex-shrink: 0;
}

.contact-info-item h4 {
  font-size: 0.95rem;
  margin-bottom: 2px;
}

.contact-info-item p,
.contact-info-item a {
  color: var(--color-text-muted);
  font-size: 0.92rem;
}

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

.contact-form {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-row label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

.form-row input,
.form-row textarea {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: border-color var(--transition);
}

.form-row input:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form-row textarea {
  resize: vertical;
  min-height: 120px;
}

.form-checkbox {
  flex-direction: row;
  align-items: flex-start;
  gap: 10px;
}

.form-checkbox input {
  margin-top: 3px;
  width: auto;
}

.form-checkbox label {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  font-weight: 400;
}

.form-checkbox a {
  color: var(--color-accent);
  text-decoration: underline;
}

/* honeypot field, hidden from real users */
.form-hp {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.form-status {
  font-size: 0.9rem;
  min-height: 1.4em;
}

.form-status.is-success {
  color: var(--color-accent);
}

.form-status.is-error {
  color: var(--color-danger);
}

@media (max-width: 860px) {
  .contact .container {
    grid-template-columns: 1fr;
  }
}

/* ---- Footer ---- */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 40px 0;
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: 0.88rem;
  transition: color var(--transition);
}

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

.footer-copy {
  color: var(--color-text-faint);
  font-size: 0.85rem;
}

/* ---- Simple legal pages (impressum / privacy) ---- */

.legal-page {
  padding: 140px 0 96px;
  max-width: 760px;
}

.legal-page h1 {
  font-size: 2rem;
  margin-bottom: 24px;
}

.legal-page h2 {
  font-size: 1.15rem;
  margin: 32px 0 12px;
}

.legal-page p,
.legal-page li {
  color: var(--color-text-muted);
  margin-bottom: 10px;
}

.legal-page .todo {
  color: var(--color-danger);
  font-weight: 600;
}