/* ============================================================
   Corvaxis — Design System & Styles
   ============================================================ */

/* ----- CSS Custom Properties ----- */
:root {
  --color-bg: #0A0A0F;
  --color-surface: #14141B;
  --color-text: #E8E8ED;
  --color-muted: #9494A6;
  --color-accent: #7C5CFF;
  --color-border: rgba(255, 255, 255, 0.08);

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

  --max-width: 1100px;
  --section-padding: 96px;
  --section-padding-mobile: 64px;
  --card-radius: 12px;
  --nav-height: 72px;

  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover,
a:focus-visible {
  color: #9B82FF;
}

/* ----- Typography ----- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-text);
}

h1 { font-size: clamp(2.25rem, 5vw, 3.75rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }

p { margin-bottom: 1rem; }

/* ----- Container ----- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ----- Section ----- */
.section {
  padding: var(--section-padding-mobile) 0;
}

@media (min-width: 768px) {
  .section {
    padding: var(--section-padding) 0;
  }
}

.section-label {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 16px;
}

/* ----- Buttons ----- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  line-height: 1;
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

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

.btn-primary:hover {
  background: #6A4DE6;
  border-color: #6A4DE6;
  color: #fff;
}

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

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

/* ----- Navbar ----- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
}

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

.navbar-logo {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.navbar-logo:hover {
  color: var(--color-text);
}

.navbar-links {
  display: none;
  list-style: none;
  align-items: center;
  gap: 32px;
}

.navbar-links a {
  font-size: 0.9rem;
  color: var(--color-muted);
  text-decoration: none;
  transition: color var(--transition);
}

.navbar-links .btn-primary {
  color: #fff;
}

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

.navbar-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.navbar-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

.navbar-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.navbar-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.navbar-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

@media (min-width: 768px) {
  .navbar-links {
    display: flex;
  }
  .navbar-toggle {
    display: none;
  }
}

/* Mobile nav */
.navbar-mobile {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  width: 100%;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  z-index: 999;
  padding: 24px;
}

.navbar-mobile.open {
  display: block;
}

.navbar-mobile ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.navbar-mobile a {
  color: var(--color-muted);
  font-size: 1.05rem;
  text-decoration: none;
}

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

@media (min-width: 768px) {
  .navbar-mobile {
    display: none !important;
  }
}

/* ----- Hero ----- */
.hero {
  padding: calc(var(--nav-height) + 80px) 0 80px;
  text-align: center;
}

.hero h1 {
  margin-bottom: 20px;
}

.hero h1 span {
  color: var(--color-accent);
}

.hero p {
  font-size: 1.15rem;
  color: var(--color-muted);
  max-width: 640px;
  margin: 0 auto 36px;
}

.hero .btn-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

/* ----- Problem Section ----- */
.problem-grid {
  display: grid;
  gap: 24px;
}

@media (min-width: 768px) {
  .problem-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.problem-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: 32px;
}

.problem-card h3 {
  margin-bottom: 12px;
}

.problem-card p {
  color: var(--color-muted);
  font-size: 0.95rem;
  margin-bottom: 0;
}

/* ----- Services Cards ----- */
.services-grid {
  display: grid;
  gap: 24px;
}

@media (min-width: 768px) {
  .services-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.service-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: 36px 28px;
  transition: border-color var(--transition);
}

.service-card:hover {
  border-color: rgba(124, 92, 255, 0.3);
}

.service-card .icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: rgba(124, 92, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.3rem;
}

.service-card h3 {
  margin-bottom: 12px;
}

.service-card p {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin-bottom: 0;
}

/* ----- How It Works ----- */
.steps {
  display: grid;
  gap: 32px;
  counter-reset: step;
}

@media (min-width: 768px) {
  .steps {
    grid-template-columns: repeat(3, 1fr);
  }
}

.step {
  text-align: center;
  padding: 32px 20px;
  position: relative;
}

.step-number {
  counter-increment: step;
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-accent);
  opacity: 0.25;
  line-height: 1;
  margin-bottom: 12px;
}

.step h3 {
  margin-bottom: 10px;
}

.step p {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin-bottom: 0;
}

/* ----- About ----- */
.about-content {
  max-width: 700px;
}

.about-content p {
  color: var(--color-muted);
  font-size: 1rem;
}

.about-detail {
  display: grid;
  gap: 16px;
  margin-top: 32px;
}

@media (min-width: 768px) {
  .about-detail {
    grid-template-columns: repeat(3, 1fr);
  }
}

.about-detail-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9rem;
  color: var(--color-muted);
}

.about-detail-item .marker {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  flex-shrink: 0;
}

/* ----- CTA Banner ----- */
.cta-banner {
  text-align: center;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.cta-banner h2 {
  margin-bottom: 16px;
}

.cta-banner p {
  color: var(--color-muted);
  max-width: 520px;
  margin: 0 auto 32px;
}

/* ----- Footer ----- */
.footer {
  padding: 48px 0 32px;
  border-top: 1px solid var(--color-border);
}

.footer-grid {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 32px;
}

@media (min-width: 768px) {
  .footer-grid {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }
}

.footer-brand .navbar-logo {
  display: inline-block;
  margin-bottom: 8px;
}

.footer-brand p {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-bottom: 0;
  max-width: 280px;
}

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--color-muted);
}

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

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--color-muted);
  margin-bottom: 0;
}

/* ============================================================
   Scroll Reveal (applied by IntersectionObserver in JS)
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

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

  html {
    scroll-behavior: auto;
  }
}

/* ============================================================
   Contact Page
   ============================================================ */
.contact-page {
  padding: calc(var(--nav-height) + 48px) 0 64px;
}

.contact-page .container {
  max-width: 640px;
}

.contact-page h1 {
  margin-bottom: 8px;
}

.contact-page > .container > p {
  color: var(--color-muted);
  margin-bottom: 40px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--color-text);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  transition: border-color var(--transition);
}

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

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

.form-group .error-message {
  font-size: 0.8rem;
  color: #FF5C5C;
  margin-top: 4px;
  display: none;
}

.form-group.invalid input,
.form-group.invalid textarea {
  border-color: #FF5C5C;
}

.form-group.invalid .error-message {
  display: block;
}

.form-status {
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 20px;
  display: none;
  font-size: 0.9rem;
}

.form-status.success {
  display: block;
  background: rgba(92, 255, 160, 0.1);
  border: 1px solid rgba(92, 255, 160, 0.3);
  color: #8CFFB4;
}

.form-status.error {
  display: block;
  background: rgba(255, 92, 92, 0.1);
  border: 1px solid rgba(255, 92, 92, 0.3);
  color: #FF8C8C;
}

.fallback-contact {
  margin-top: 40px;
  padding: 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  text-align: center;
}

.fallback-contact p {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin-bottom: 8px;
}

.fallback-contact a {
  font-size: 1rem;
  font-weight: 500;
}

/* ============================================================
   Privacy Page
   ============================================================ */
.privacy-page {
  padding: calc(var(--nav-height) + 48px) 0 64px;
}

.privacy-page .container {
  max-width: 720px;
}

.privacy-page h1 {
  margin-bottom: 8px;
}

.privacy-page .last-updated {
  color: var(--color-muted);
  font-size: 0.85rem;
  margin-bottom: 48px;
}

.privacy-page h2 {
  font-size: 1.25rem;
  margin-top: 36px;
  margin-bottom: 12px;
}

.privacy-page p,
.privacy-page li {
  color: var(--color-muted);
  font-size: 0.95rem;
}

.privacy-page ul {
  padding-left: 20px;
  margin-bottom: 1rem;
}

.privacy-page li {
  margin-bottom: 6px;
}

/* ============================================================
   404 Page
   ============================================================ */
.page-404 {
  padding: calc(var(--nav-height) + 80px) 0 80px;
  text-align: center;
}

.page-404 h1 {
  font-size: clamp(4rem, 10vw, 8rem);
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 8px;
}

.page-404 p {
  color: var(--color-muted);
  margin-bottom: 32px;
}