/* =========================================================
   NIMBUS LANDING PAGE — STYLES
   Structure:
   1. CSS Variables / Reset
   2. Base & Typography
   3. Layout helpers / Buttons
   4. Header / Nav
   5. Hero
   6. Features
   7. Screenshots / Tabs
   8. Pricing
   9. Testimonials / Carousel
   10. FAQ Accordion
   11. Newsletter
   12. Contact
   13. Footer
   14. Scroll-reveal animation
   15. Responsive breakpoints
   ========================================================= */

/* ---------- 1. CSS Variables / Reset ---------- */
:root {
  /* Color palette — indigo/violet startup-tech */
  --color-primary: #6d5bf5;
  --color-primary-dark: #5442e0;
  --color-primary-light: #8f7ffb;
  --color-accent: #22d3ee;
  --color-bg: #ffffff;
  --color-bg-alt: #f7f6fe;
  --color-dark: #12101c;
  --color-dark-soft: #1d1a2b;
  --color-text: #2c2a3a;
  --color-text-muted: #6b6880;
  --color-border: #e6e4f2;
  --color-white: #ffffff;
  --color-success: #16a34a;
  --color-error: #e11d48;

  --gradient-primary: linear-gradient(135deg, #6d5bf5 0%, #8f7ffb 50%, #22d3ee 100%);
  --gradient-dark: linear-gradient(160deg, #171425 0%, #2a2245 100%);

  --font-base: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-pill: 999px;

  --shadow-sm: 0 2px 8px rgba(30, 20, 70, 0.06);
  --shadow-md: 0 8px 24px rgba(30, 20, 70, 0.1);
  --shadow-lg: 0 20px 48px rgba(30, 20, 70, 0.16);

  --container-width: 1160px;
  --transition-fast: 0.18s ease;
  --transition-base: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body,
h1, h2, h3, h4, p, ul, ol, figure, blockquote {
  margin: 0;
}

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

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

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

ul {
  list-style: none;
  padding: 0;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea, button {
  font-family: inherit;
  font-size: 1rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 2. Base & Typography ---------- */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-dark);
}

h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
}

h3 {
  font-size: 1.25rem;
}

p {
  color: var(--color-text-muted);
}

.eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  background: rgba(109, 91, 245, 0.1);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 1rem;
}

.eyebrow-center {
  display: block;
  width: fit-content;
  margin-inline: auto;
}

/* ---------- 3. Layout helpers / Buttons ---------- */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: 20px;
}

section {
  padding: 5rem 0;
}

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

.section-heading p {
  margin-top: 0.75rem;
  font-size: 1.05rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-pill);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}

.btn:active {
  transform: translateY(1px) scale(0.98);
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--color-dark);
  border: 1.5px solid var(--color-border);
}

.btn-ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary-dark);
  border: 1.5px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn-sm {
  padding: 0.55rem 1.2rem;
  font-size: 0.85rem;
}

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

.btn-block {
  width: 100%;
}

/* ---------- 4. Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.navbar {
  max-width: var(--container-width);
  margin-inline: auto;
  padding: 1rem 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--color-dark);
}

.logo-mark {
  color: var(--color-primary);
  display: inline-flex;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--color-text);
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-primary-dark);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-fast);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-cta-item {
  margin-left: 0.5rem;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
}

.hamburger,
.hamburger::before,
.hamburger::after {
  content: "";
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-dark);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.hamburger {
  position: relative;
  margin: 0 auto;
}

.hamburger::before {
  position: absolute;
  top: -7px;
}

.hamburger::after {
  position: absolute;
  top: 7px;
}

.nav-toggle.open .hamburger {
  background: transparent;
}

.nav-toggle.open .hamburger::before {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.open .hamburger::after {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ---------- 5. Hero ---------- */
.hero {
  position: relative;
  padding: 4.5rem 0 5rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 20%, rgba(109, 91, 245, 0.14), transparent 45%),
    radial-gradient(circle at 85% 10%, rgba(34, 211, 238, 0.14), transparent 40%),
    var(--color-bg-alt);
  z-index: -1;
}

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

.hero-title {
  font-size: clamp(2.2rem, 5.5vw, 3.4rem);
  margin-bottom: 1.25rem;
}

.hero-subtitle {
  font-size: 1.1rem;
  max-width: 520px;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.hero-trust {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.hero-trust span:first-child {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.trust-logos {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  font-weight: 700;
  color: var(--color-text-muted);
  opacity: 0.7;
}

/* Hero visual mockup */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.mockup-window {
  width: 100%;
  max-width: 460px;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.mockup-bar {
  display: flex;
  gap: 6px;
  padding: 0.75rem 1rem;
  background: #f1f0fb;
  border-bottom: 1px solid var(--color-border);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.dot-red { background: #ff5f57; }
.dot-yellow { background: #febc2e; }
.dot-green { background: #28c840; }

.mockup-body {
  display: flex;
  min-height: 260px;
}

.mockup-sidebar {
  width: 70px;
  background: var(--gradient-dark);
  padding: 1rem 0.6rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.mockup-pill {
  height: 10px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.15);
}

.mockup-pill-active {
  background: var(--color-accent);
}

.mockup-main {
  flex: 1;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  background: linear-gradient(160deg, #fbfaff, #f1effe);
}

.mockup-card {
  flex: 1;
  border-radius: var(--radius-sm);
  background: var(--color-white);
  box-shadow: var(--shadow-sm);
  min-height: 40px;
}

.mockup-card-lg {
  min-height: 60px;
  background: linear-gradient(120deg, rgba(109,91,245,0.14), rgba(34,211,238,0.12));
}

.mockup-row {
  display: flex;
  gap: 0.75rem;
}

.mockup-chart {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 70px;
  background: var(--color-white);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  box-shadow: var(--shadow-sm);
}

.mockup-chart span {
  flex: 1;
  border-radius: 4px 4px 0 0;
  background: var(--gradient-primary);
}

.floating-badge {
  position: absolute;
  background: var(--color-white);
  border-radius: var(--radius-pill);
  padding: 0.5rem 1rem;
  font-size: 0.8rem;
  font-weight: 600;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
}

.badge-1 {
  top: 8%;
  left: -4%;
}

.badge-2 {
  bottom: 6%;
  right: -4%;
}

/* ---------- 6. Features ---------- */
.features {
  background: var(--color-bg);
}

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

.feature-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-light);
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: rgba(109, 91, 245, 0.1);
  color: var(--color-primary-dark);
  font-size: 1.4rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: 0.95rem;
}

/* ---------- 7. Screenshots / Tabs ---------- */
.screenshots {
  background: var(--color-bg-alt);
}

.tab-buttons {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}

.tab-btn.active,
.tab-btn:hover {
  background: var(--gradient-primary);
  color: var(--color-white);
  border-color: transparent;
}

.browser-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  max-width: 780px;
  margin-inline: auto;
}

.browser-topbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0.75rem 1rem;
  background: #f1f0fb;
  border-bottom: 1px solid var(--color-border);
}

.browser-url {
  margin-left: 1rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  background: var(--color-white);
  padding: 0.2rem 0.8rem;
  border-radius: var(--radius-pill);
  flex: 1;
  max-width: 260px;
}

.browser-content {
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.gradient-1 { background: linear-gradient(135deg, #6d5bf5, #8f7ffb 60%, #22d3ee); }
.gradient-2 { background: linear-gradient(135deg, #22d3ee, #6d5bf5 60%, #171425); }
.gradient-3 { background: linear-gradient(135deg, #171425, #5442e0 60%, #22d3ee); }

.screenshot-placeholder {
  text-align: center;
  color: var(--color-white);
  max-width: 380px;
}

.screenshot-placeholder h4 {
  color: var(--color-white);
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
}

.screenshot-placeholder p {
  color: rgba(255, 255, 255, 0.85);
}

/* ---------- 8. Pricing ---------- */
.pricing-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
}

.toggle-label {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.save-badge {
  background: rgba(34, 211, 238, 0.15);
  color: #0e7490;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-pill);
}

.switch {
  width: 52px;
  height: 28px;
  border-radius: var(--radius-pill);
  background: var(--color-border);
  position: relative;
  transition: background var(--transition-fast);
  flex-shrink: 0;
}

.switch[aria-checked="true"] {
  background: var(--gradient-primary);
}

.switch-knob {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-white);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast);
}

.switch[aria-checked="true"] .switch-knob {
  transform: translateX(24px);
}

.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: stretch;
}

.price-card {
  position: relative;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.price-card-featured {
  border: 2px solid var(--color-primary);
  box-shadow: var(--shadow-lg);
  background: linear-gradient(180deg, #fbfaff, #ffffff);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-primary);
  color: var(--color-white);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.35rem 1rem;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-sm);
  white-space: nowrap;
}

.price-desc {
  font-size: 0.9rem;
  margin-bottom: 1.25rem;
  min-height: 2.6em;
}

.price-amount {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
  margin-bottom: 1.5rem;
}

.price-value {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-dark);
}

.price-period {
  color: var(--color-text-muted);
  font-weight: 500;
}

.price-features {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  font-size: 0.9rem;
}

/* ---------- 9. Testimonials / Carousel ---------- */
.testimonials {
  background: var(--gradient-dark);
}

.testimonials .section-heading h2,
.testimonials .eyebrow {
  color: var(--color-white);
}

.testimonials .eyebrow {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-accent);
}

.testimonial-carousel {
  max-width: 720px;
  margin-inline: auto;
  overflow: hidden;
}

.testimonial-track {
  display: flex;
  transition: transform var(--transition-base);
}

.testimonial-card {
  flex: 0 0 100%;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  backdrop-filter: blur(6px);
}

.testimonial-card .quote {
  color: var(--color-white);
  font-size: 1.2rem;
  line-height: 1.5;
  margin-bottom: 1.5rem;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
}

.author-info {
  display: flex;
  flex-direction: column;
  font-size: 0.9rem;
}

.author-info strong {
  color: var(--color-white);
}

.author-info span:last-child {
  color: rgba(255, 255, 255, 0.65);
}

.carousel-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  margin-top: 1.75rem;
}

.carousel-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
  font-size: 1.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast);
}

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

.carousel-dots {
  display: flex;
  gap: 0.5rem;
}

.carousel-dots button {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.carousel-dots button.active {
  background: var(--color-accent);
  transform: scale(1.3);
}

/* ---------- 10. FAQ Accordion ---------- */
.faq {
  background: var(--color-bg);
}

.faq-list {
  max-width: 720px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-white);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 1.1rem 1.4rem;
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-dark);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.faq-icon {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: var(--color-primary);
  transition: transform var(--transition-fast), background var(--transition-fast);
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
  background: var(--color-primary);
  color: var(--color-white);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base) ease;
}

.faq-answer p {
  padding: 0 1.4rem 1.25rem;
  font-size: 0.95rem;
}

/* ---------- 11. Newsletter ---------- */
.newsletter {
  background: var(--gradient-primary);
}

.newsletter-inner {
  text-align: center;
  max-width: 600px;
}

.newsletter-inner h2,
.newsletter-inner p {
  color: var(--color-white);
}

.newsletter-inner p {
  opacity: 0.9;
  margin-bottom: 2rem;
}

.newsletter-form {
  max-width: 480px;
  margin-inline: auto;
}

.form-field {
  display: flex;
  gap: 0.75rem;
  background: var(--color-white);
  padding: 0.4rem;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-lg);
}

.form-field input {
  flex: 1;
  border: none;
  outline: none;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-pill);
  background: transparent;
}

.form-error {
  color: #fff1f2;
  background: rgba(225, 29, 72, 0.35);
  font-size: 0.85rem;
  margin-top: 0.75rem;
  border-radius: var(--radius-sm);
  padding: 0;
  min-height: 0;
}

.form-error:not(:empty) {
  padding: 0.5rem 0.9rem;
}

.form-success {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.18);
  font-size: 0.9rem;
  font-weight: 600;
  margin-top: 1rem;
  border-radius: var(--radius-sm);
  padding: 0;
}

.form-success:not(:empty) {
  padding: 0.65rem 1rem;
}

/* ---------- 12. Contact ---------- */
.contact {
  background: var(--color-bg-alt);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

.contact-info h2 {
  margin: 0.5rem 0 1rem;
}

.contact-info p {
  margin-bottom: 1.75rem;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.contact-details li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.95rem;
}

.contact-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
}

.social-links {
  display: flex;
  gap: 0.75rem;
}

.social-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
  transition: all var(--transition-fast);
}

.social-icon:hover {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.contact-form {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-weight: 600;
  font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
  padding: 0.7rem 0.9rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  outline: none;
  resize: vertical;
  transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
}

.form-group.invalid input,
.form-group.invalid textarea {
  border-color: var(--color-error);
}

.field-error {
  font-size: 0.8rem;
  color: var(--color-error);
  min-height: 1em;
}

/* ---------- 13. Footer ---------- */
.site-footer {
  background: var(--color-dark);
  color: rgba(255, 255, 255, 0.7);
  padding-top: 4rem;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-width: 280px;
}

.logo-footer {
  color: var(--color-white);
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.9rem;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-col h4 {
  color: var(--color-white);
  font-size: 0.9rem;
  margin-bottom: 0.35rem;
}

.footer-col a {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

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

.footer-social {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-social h4 {
  color: var(--color-white);
  font-size: 0.9rem;
}

.footer-social .social-icon {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.75);
}

.footer-bottom {
  padding: 1.5rem 20px;
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.45);
}

/* ---------- 14. Scroll-reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  html {
    scroll-behavior: auto;
  }
}

/* ---------- 15. Responsive breakpoints ---------- */

/* Tablet and below: mobile nav */
@media (max-width: 900px) {
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: 0;
    height: 100vh;
    width: min(78vw, 320px);
    background: var(--color-white);
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    padding: 6rem 2rem 2rem;
    gap: 1.5rem;
    box-shadow: var(--shadow-lg);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    z-index: 200;
  }

  .nav-menu.open {
    transform: translateX(0);
  }

  .nav-cta-item {
    margin-left: 0;
    width: 100%;
  }

  .nav-cta-item .btn {
    width: 100%;
  }
}

/* Small phones */
@media (max-width: 480px) {
  section {
    padding: 3.5rem 0;
  }

  .hero {
    padding-top: 3rem;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .form-field {
    flex-direction: column;
    border-radius: var(--radius-md);
  }

  .form-field button {
    width: 100%;
  }

  .badge-1,
  .badge-2 {
    display: none;
  }
}

/* Tablet: 2-column features + pricing */
@media (min-width: 640px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

/* Desktop */
@media (min-width: 900px) {
  .hero-inner {
    grid-template-columns: 1.1fr 0.9fr;
  }

  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .price-card-featured {
    transform: translateY(-12px);
  }

  .price-card-featured:hover {
    transform: translateY(-16px);
  }

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

  .footer-inner {
    grid-template-columns: 1.2fr 2fr 1fr;
  }
}

@media (min-width: 1100px) {
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}