/* ==========================================
   Covorent — styles.css
   Premium dark-mode B2B design system
   ========================================== */

:root {
  /* Colors */
  --color-bg: #0a0a0c;
  --color-bg-elevated: #121216;
  --color-surface: #16161c;
  --color-surface-hover: #1e1e26;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-light: rgba(255, 255, 255, 0.15);
  
  --color-ink: #ffffff;
  --color-ink-soft: #a1a1aa;
  --color-ink-muted: #71717a;
  
  --color-primary: #d4d4d8;
  --color-primary-hover: #ffffff;
  --color-accent: #a5b4fc;
  --color-accent-hover: #c7d2fe;
  
  --color-error: #ef4444;
  --color-success: #22c55e;
  --color-focus: #a5b4fc;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 4rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Layout */
  --container-max: 1200px;
  --container-pad: 1.5rem;
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-full: 9999px;
  
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 40px rgba(165, 180, 252, 0.15);
  
  --header-height: 80px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-ink);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  transition: color var(--transition);
}
a:hover { color: var(--color-accent-hover); }

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-4);
  line-height: 1.1;
  font-weight: 500;
  letter-spacing: -0.03em;
  color: var(--color-ink);
}
h1 { font-size: clamp(2.5rem, 6vw, var(--text-6xl)); font-weight: 500; letter-spacing: -0.04em; }
h2 { font-size: clamp(2rem, 4vw, var(--text-5xl)); font-weight: 500; letter-spacing: -0.03em; }
h3 { font-size: var(--text-2xl); font-weight: 500; }

p { margin: 0 0 var(--space-4); color: var(--color-ink-soft); }
ul, ol { margin: 0; padding: 0; list-style: none; }

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 1000;
  padding: var(--space-3) var(--space-5);
  background: var(--color-ink);
  color: var(--color-bg);
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-decoration: none;
}
.skip-link:focus { top: var(--space-4); }

/* ---------- Layout Helpers ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.section { padding-block: var(--space-20); }
.section:nth-child(even) { background-color: var(--color-bg-elevated); }

.section-header {
  max-width: 720px;
  margin-bottom: var(--space-12);
  text-align: center;
  margin-inline: auto;
}

.section-lead {
  font-size: var(--text-lg);
  color: var(--color-ink-soft);
}

.eyebrow {
  display: inline-block;
  margin-bottom: var(--space-4);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: inherit;
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1.5;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition);
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-bg);
}
.btn-primary:hover {
  background-color: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(255, 255, 255, 0.2);
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-ink);
  border-color: var(--color-border-light);
}
.btn-ghost:hover {
  background-color: var(--color-surface);
  border-color: var(--color-ink-muted);
}

.btn-full { width: 100%; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 12, 0.6);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  max-width: var(--container-max);
  margin-inline: auto;
  padding: 0 var(--container-pad);
  height: var(--header-height);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-ink);
  text-decoration: none;
  font-weight: 500;
  letter-spacing: 0.25em;
  font-size: var(--text-sm);
  text-transform: uppercase;
}
.brand:hover { color: var(--color-ink); }
.brand-mark { 
  display: inline-flex; 
  width: 32px;
  height: 32px;
}

.main-nav { display: flex; align-items: center; }

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}
.nav-list a {
  color: var(--color-ink-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition);
  position: relative;
}
.nav-list a:hover,
.nav-list a[aria-current="page"] { color: var(--color-ink); }

.nav-list a[aria-current="page"]::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-ink);
  border-radius: 2px;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.hamburger,
.hamburger::before,
.hamburger::after {
  display: block;
  width: 20px;
  height: 1.5px;
  margin-inline: auto;
  background: var(--color-ink);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.hamburger { position: relative; transform: translateY(-3px); }
.hamburger::before,
.hamburger::after { content: ''; position: absolute; left: 0; }
.hamburger::before { top: 6px; }
.hamburger::after { top: 12px; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding-block: var(--space-24) var(--space-16);
  background-color: var(--color-bg);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: var(--space-16);
}

.hero-content h1 { 
  margin-bottom: var(--space-6); 
  color: #ffffff;
}
.hero-content h1 span {
  color: #c7d2fe;
}

.hero-subtitle {
  font-size: var(--text-lg);
  color: var(--color-ink-soft);
  max-width: 50ch;
  margin-bottom: var(--space-8);
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-12);
}

/* Hero Bottom Features */
.hero-features {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-12);
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.feature-icon {
  flex-shrink: 0;
  color: var(--color-ink-muted);
}

.feature-text h4 {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-ink);
  margin-bottom: var(--space-1);
  letter-spacing: 0;
}

.feature-text p {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  margin: 0;
}

/* Hero Visual (3D Logo) */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.hero-visual::before {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(165, 180, 252, 0.15) 0%, transparent 70%);
  filter: blur(40px);
  z-index: 0;
}

.hero-logo-large {
  width: 100%;
  max-width: 320px;
  height: auto;
  position: relative;
  z-index: 1;
  animation: float 6s ease-in-out infinite;
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.5));
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

/* ---------- Services ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

.service-card {
  padding: var(--space-8) var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}
.service-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-border-light);
  box-shadow: var(--shadow-md);
  background: var(--color-surface-hover);
}

.service-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-bottom: var(--space-5);
  color: var(--color-accent);
}
.service-card h3 { 
  margin-bottom: var(--space-3); 
  font-size: var(--text-lg);
}
.service-card p { 
  font-size: var(--text-sm); 
  color: var(--color-ink-soft); 
  margin: 0; 
  line-height: 1.5;
}

/* ---------- How It Works ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.step {
  position: relative;
  padding: var(--space-8);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border-light);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: var(--space-5);
}

.step h3 { margin-bottom: var(--space-2); font-size: var(--text-xl); }
.step p { font-size: var(--text-sm); color: var(--color-ink-soft); margin: 0; }

/* ---------- Use Case ---------- */
.usecase-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

.usecase-card {
  padding: var(--space-8);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}
.usecase-card h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-4);
  color: var(--color-ink);
}
.usecase-card p { font-size: var(--text-sm); color: var(--color-ink-soft); margin: 0; }

/* Removed .usecase-note as requested */

/* ---------- FAQ ---------- */
.faq-container { max-width: 800px; margin-inline: auto; }

.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item[open] {
  border-color: var(--color-border-light);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-6);
  font-weight: 500;
  font-size: var(--text-base);
  cursor: pointer;
  list-style: none;
  color: var(--color-ink);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  font-size: var(--text-xl);
  font-weight: 300;
  color: var(--color-ink-muted);
  line-height: 1;
  flex-shrink: 0;
  transition: transform var(--transition);
}
.faq-item[open] summary::after { transform: rotate(45deg); color: var(--color-ink); }

.faq-answer { padding: 0 var(--space-6) var(--space-6); }
.faq-answer p { font-size: var(--text-sm); color: var(--color-ink-soft); margin: 0; line-height: 1.6; }

/* ---------- Contact ---------- */
.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: start;
}

.contact-copy h2 { margin-bottom: var(--space-4); }
.contact-copy > p {
  font-size: var(--text-base);
  color: var(--color-ink-soft);
  margin-bottom: var(--space-8);
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.contact-details li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}
.contact-details li svg { flex-shrink: 0; color: var(--color-ink-muted); }
.contact-details a { color: var(--color-ink-soft); text-decoration: none; }
.contact-details a:hover { color: var(--color-ink); }

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  padding: var(--space-8);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.form-field label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-ink);
}
.form-field input,
.form-field textarea {
  padding: var(--space-3) var(--space-4);
  font-family: inherit;
  font-size: var(--text-sm);
  color: var(--color-ink);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  width: 100%;
}
.form-field input::placeholder,
.form-field textarea::placeholder { color: var(--color-ink-muted); }
.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--color-ink-muted);
  background: var(--color-bg);
}
.form-field textarea { resize: vertical; min-height: 120px; }

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

.form-note {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  margin: 0;
  text-align: center;
}
.form-note a { color: var(--color-ink-muted); text-decoration: underline; }

.form-success {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-success);
  text-align: center;
  min-height: 1.5em;
  margin: 0;
}

/* ---------- Legal page styles ---------- */
.legal-hero {
  padding-block: var(--space-20) var(--space-12);
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
}

.legal-hero h1 { margin-bottom: var(--space-2); }

.legal-meta {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  margin: 0;
}

.legal-body { padding-block: var(--space-16) var(--space-24); background: var(--color-bg); }

.legal-container { max-width: 800px; margin-inline: auto; }

.legal-container > p:first-of-type {
  font-size: var(--text-lg);
  color: var(--color-ink-soft);
  margin-bottom: var(--space-10);
}

.legal-container h2 {
  font-size: var(--text-2xl);
  margin-top: var(--space-10);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}
.legal-container h2:first-of-type { margin-top: 0; }

.legal-container p {
  color: var(--color-ink-soft);
  line-height: 1.7;
}

.legal-data {
  display: grid;
  grid-template-columns: minmax(180px, 240px) 1fr;
  gap: var(--space-4) var(--space-6);
  margin: var(--space-8) 0;
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
}

.legal-data dt { font-weight: 500; color: var(--color-ink); }
.legal-data dd {
  margin: 0;
  color: var(--color-ink-soft);
  word-break: break-word;
}

.legal-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin: var(--space-6) 0;
  padding-left: var(--space-6);
  list-style: disc;
  color: var(--color-ink-soft);
}
.legal-list li::marker { color: var(--color-ink-muted); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-bg-elevated);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-12);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--space-6);
}

.footer-brand .brand-name {
  display: block;
  font-size: var(--text-lg);
  font-weight: 500;
  color: #fff;
  margin-bottom: var(--space-2);
  letter-spacing: 0.25em;
  text-transform: uppercase;
}
.footer-brand p {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  margin: 0;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-6);
  justify-content: flex-end;
  align-items: center;
}
.footer-nav a {
  color: var(--color-ink-muted);
  text-decoration: none;
  font-size: var(--text-sm);
  transition: color var(--transition);
}
.footer-nav a:hover { color: var(--color-ink); }

.footer-copy {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  margin: 0;
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

/* ==========================================
   Responsive
   ========================================== */

@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; gap: var(--space-12); }
  .hero-content { display: flex; flex-direction: column; align-items: center; }
  .hero-actions { justify-content: center; }
  .hero-features { grid-template-columns: repeat(2, 1fr); text-align: left; margin-top: var(--space-8); }
  .hero-visual { order: -1; }
  .hero-logo-large { max-width: 250px; }

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

  .contact-inner { grid-template-columns: 1fr; gap: var(--space-10); }
}

@media (max-width: 768px) {
  :root {
    --container-pad: 1.25rem;
    --header-height: 72px;
  }

  .section { padding-block: var(--space-16); }

  .nav-toggle { display: block; }

  .nav-list {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-4) var(--container-pad) var(--space-6);
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-10px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: all var(--transition);
  }
  .nav-list.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }
  .nav-list li { width: 100%; }
  .nav-list a {
    display: block;
    padding: var(--space-4) 0;
    font-size: var(--text-base);
    border-bottom: 1px solid var(--color-border);
  }
  .nav-list a[aria-current="page"]::after { display: none; }
  .nav-list li:last-child a { border-bottom: none; }

  .hero-features { grid-template-columns: 1fr; gap: var(--space-4); }
  .services-grid { grid-template-columns: 1fr; }

  .contact-form { padding: var(--space-6); }

  .footer-top { flex-direction: column; gap: var(--space-6); }
  .footer-nav { flex-direction: column; align-items: flex-start; gap: var(--space-3); }

  .legal-data {
    grid-template-columns: 1fr;
    gap: var(--space-1) 0;
    padding: var(--space-5);
  }
  .legal-data dt { margin-top: var(--space-3); }
  .legal-data dt:first-child { margin-top: 0; }
}