/* ============================================================
   CIRRUSSTI – styles.css
   Paleta corporativa tech (dark mode)
   --brand:       #0ea5e9  (sky-500)
   --brand-dark:  #0369a1  (sky-700)
   --brand-light: #e0f2fe  (sky-100)
   --bg-base:     #020617  (slate-950)
   --bg-surface:  #0f172a  (slate-900)
   --bg-card:     #1e293b  (slate-800)
   --border:      #334155  (slate-700)
   --text-main:   #f1f5f9  (slate-100)
   --text-muted:  #94a3b8  (slate-400)
============================================================ */

/* ── Reset & base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --brand:       #0ea5e9;
  --brand-dark:  #0369a1;
  --brand-light: #e0f2fe;
  --bg-base:     #020617;
  --bg-surface:  #0f172a;
  --bg-card:     #1e293b;
  --border:      #334155;
  --border-dim:  #1e293b;
  --text-main:   #f1f5f9;
  --text-muted:  #94a3b8;
  --text-dim:    #64748b;
  --radius-xl:   1rem;
  --radius-2xl:  1.25rem;
  --radius-full: 9999px;
  --transition:  0.25s ease;
  --shadow-brand: 0 20px 40px rgba(14, 165, 233, 0.18);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-base);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ── Typography helpers ── */
.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--brand);
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.2;
  margin-top: 0.5rem;
}

.section-subtitle {
  color: var(--text-muted);
  margin-top: 1rem;
  max-width: 38rem;
}

/* ── Layout ── */
.container {
  width: 100%;
  max-width: 72rem;
  margin-inline: auto;
  padding-inline: 1.5rem;
}

/* ============================================================
   NAVBAR
============================================================ */
nav {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 50;
  height: 4rem;
  background-color: rgba(2, 6, 23, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-dim);
  transition: background-color var(--transition), box-shadow var(--transition);
}

nav.scrolled {
  background-color: rgba(2, 6, 23, 0.97);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

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

.nav-logo {
  font-size: 1.4rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--brand);
}

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

.nav-links {
  display: flex;
  gap: 2rem;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--brand);
  border-radius: var(--radius-full);
  transition: width var(--transition);
}

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

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--brand);
  color: #fff;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-full);
  transition: background-color var(--transition), transform var(--transition);
}

.nav-cta:hover {
  background-color: var(--brand-dark);
  transform: translateY(-1px);
}

/* ============================================================
   HERO
============================================================ */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: 4rem;
  background: linear-gradient(135deg, #0f172a 0%, #0369a1 60%, #0ea5e9 100%);
  position: relative;
  overflow: hidden;
}

/* subtle grid overlay */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(14,165,233,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14,165,233,0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
  padding-block: 5rem;
}

.hero-badge {
  display: inline-block;
  background-color: rgba(14, 165, 233, 0.15);
  color: var(--brand);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(14, 165, 233, 0.25);
  margin-bottom: 1.25rem;
}

.hero-title {
  font-size: clamp(2.4rem, 6vw, 3.75rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.hero-title .highlight { color: var(--brand); }

.hero-desc {
  font-size: 1.1rem;
  color: #cbd5e1;
  line-height: 1.75;
  margin-bottom: 2rem;
  max-width: 32rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.btn-primary {
  background-color: var(--brand);
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.8rem 1.75rem;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: background-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.btn-primary:hover {
  background-color: var(--brand-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(14, 165, 233, 0.35);
}

.btn-outline {
  background-color: transparent;
  color: #e2e8f0;
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.8rem 1.75rem;
  border-radius: var(--radius-full);
  border: 1px solid #475569;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition), transform var(--transition);
}

.btn-outline:hover {
  border-color: var(--brand);
  color: var(--brand);
  transform: translateY(-2px);
}

/* Hero orb animation */
.hero-orb-wrapper {
  display: flex;
  justify-content: center;
}

.hero-orb {
  position: relative;
  width: 18rem;
  height: 18rem;
}

.orb-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background-color: rgba(14, 165, 233, 0.08);
  animation: pulse-ring 3s ease-in-out infinite;
}

.orb-ring:nth-child(2) {
  inset: 2rem;
  background-color: rgba(14, 165, 233, 0.14);
  animation-delay: 0.5s;
}

.orb-ring:nth-child(3) {
  inset: 4rem;
  background-color: rgba(14, 165, 233, 0.22);
  display: flex;
  align-items: center;
  justify-content: center;
  animation-delay: 1s;
}

.orb-ring svg {
  width: 5rem;
  height: 5rem;
  color: var(--brand);
}

@keyframes pulse-ring {
  0%, 100% { transform: scale(1); opacity: 1; }
  50%       { transform: scale(1.04); opacity: 0.7; }
}

/* ============================================================
   STATS BAR
============================================================ */
.stats-bar {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-dim);
  border-bottom: 1px solid var(--border-dim);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  padding-block: 3rem;
  text-align: center;
}

.stat-number {
  font-size: 2.25rem;
  font-weight: 900;
  color: var(--brand);
  line-height: 1;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
}

/* ============================================================
   SERVICES
============================================================ */
.services {
  padding-block: 6rem;
  background-color: var(--bg-base);
}

.services-header {
  text-align: center;
  margin-bottom: 4rem;
}

.services-header .section-subtitle {
  margin-inline: auto;
}

.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.service-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-2xl);
  padding: 2rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-brand);
  border-color: rgba(14, 165, 233, 0.3);
}

.service-icon {
  width: 3rem;
  height: 3rem;
  background-color: rgba(14, 165, 233, 0.1);
  border-radius: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  transition: background-color var(--transition);
}

.service-card:hover .service-icon {
  background-color: rgba(14, 165, 233, 0.2);
}

.service-icon svg {
  width: 1.4rem;
  height: 1.4rem;
  color: var(--brand);
}

.service-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.service-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ============================================================
   ABOUT
============================================================ */
.about {
  padding-block: 6rem;
  background-color: var(--bg-surface);
}

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

.about-text .section-title { margin-bottom: 1.25rem; }

.about-text p {
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.about-checklist {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.about-checklist li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.875rem;
  color: #cbd5e1;
}

.check-icon {
  flex-shrink: 0;
  margin-top: 2px;
  width: 1.2rem;
  height: 1.2rem;
  border-radius: 50%;
  background-color: rgba(14, 165, 233, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
}

.check-icon svg {
  width: 0.65rem;
  height: 0.65rem;
  color: var(--brand);
}

.about-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.about-badge-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-2xl);
  padding: 1.5rem;
  transition: border-color var(--transition);
}

.about-badge-card:hover { border-color: var(--brand); }

.about-badge-card.full { grid-column: span 2; }

.about-badge-card .badge-title {
  font-size: 1.75rem;
  font-weight: 900;
  color: var(--brand);
}

.about-badge-card .badge-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.testimonial-text {
  font-size: 0.875rem;
  font-style: italic;
  color: #cbd5e1;
  line-height: 1.75;
}

.testimonial-author {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--brand);
  margin-top: 0.75rem;
}

/* ============================================================
   TECH STACK
============================================================ */
.tech {
  padding-block: 5rem;
  background-color: var(--bg-base);
  text-align: center;
}

.tech-header { margin-bottom: 3rem; }

.tech-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

.tech-badge {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-dim);
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.45rem 1rem;
  border-radius: var(--radius-full);
  cursor: default;
  transition: border-color var(--transition), color var(--transition), transform var(--transition);
}

.tech-badge:hover {
  border-color: var(--brand);
  color: var(--brand);
  transform: translateY(-2px);
}

/* ============================================================
   CONTACT FORM
============================================================ */
.contact {
  padding-block: 6rem;
  background-color: var(--bg-surface);
}

.contact-header {
  text-align: center;
  margin-bottom: 3rem;
}

.contact-header .section-subtitle {
  margin-inline: auto;
}

.contact-form-wrapper {
  max-width: 42rem;
  margin-inline: auto;
}

.form-card {
  background-color: var(--bg-base);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-2xl);
  padding: 2.5rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 1.25rem;
}

.form-group:last-of-type { margin-bottom: 0; }

.form-group label {
  font-size: 0.8rem;
  font-weight: 600;
  color: #cbd5e1;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  color: var(--text-main);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  font-family: inherit;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-dim);
}

.form-group select {
  color: var(--text-muted);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.85rem center;
  background-size: 1rem;
  padding-right: 2.5rem;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.12);
}

.form-group textarea { resize: none; }

/* Form alert states */
.form-alert {
  display: none;
  font-size: 0.8rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-xl);
  margin-bottom: 1.25rem;
}

.form-alert.error {
  display: block;
  background-color: rgba(127, 29, 29, 0.3);
  border: 1px solid #b91c1c;
  color: #fca5a5;
}

.form-alert.success {
  display: block;
  background-color: rgba(20, 83, 45, 0.3);
  border: 1px solid #15803d;
  color: #86efac;
}

/* Submit button */
.btn-submit {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background-color: var(--brand);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 700;
  padding: 0.85rem 1.5rem;
  border-radius: var(--radius-xl);
  border: none;
  cursor: pointer;
  margin-top: 1.5rem;
  transition: background-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.btn-submit:hover:not(:disabled) {
  background-color: var(--brand-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(14, 165, 233, 0.3);
}

.btn-submit:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.btn-submit svg { width: 1rem; height: 1rem; }

/* Spinner */
@keyframes spin { to { transform: rotate(360deg); } }
.animate-spin { animation: spin 0.8s linear infinite; }

/* ============================================================
   FOOTER
============================================================ */
footer {
  background-color: var(--bg-base);
  border-top: 1px solid var(--border-dim);
  padding-block: 2.5rem;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}

.footer-logo {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--brand);
}

.footer-logo span { color: var(--text-main); }

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: color var(--transition);
}

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

/* ============================================================
   RESPONSIVE – tablet (≥ 768px)
============================================================ */
@media (min-width: 768px) {
  .hero-grid {
    grid-template-columns: 1fr 1fr;
    padding-block: 6rem;
  }

  .hero-orb { width: 24rem; height: 24rem; }

  .stats-grid { grid-template-columns: repeat(4, 1fr); }

  .services-grid { grid-template-columns: repeat(2, 1fr); }

  .about-grid { grid-template-columns: 1fr 1fr; }

  .form-row { grid-template-columns: repeat(2, 1fr); }

  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* ============================================================
   RESPONSIVE – desktop (≥ 1024px)
============================================================ */
@media (min-width: 1024px) {
  .services-grid { grid-template-columns: repeat(3, 1fr); }
}

/* ============================================================
   SCROLL REVEAL (JS-driven)
============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   SCROLLBAR (webkit)
============================================================ */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--brand-dark); }

/* ============================================================
   SELECTION
============================================================ */
::selection {
  background-color: rgba(14, 165, 233, 0.3);
  color: #fff;
}