/* ── ErgoVolo Design System ── */

:root {
  --color-deep-purple: #2d0a4e;
  --color-purple: #4a1a7a;
  --color-royal: #2e3a8e;
  --color-blue: #1a4faa;
  --color-cyan: #00b4d8;
  --color-teal: #00d4aa;
  --color-aqua: #00e5c8;

  --color-text: #e8edf5;
  --color-text-muted: rgba(232, 237, 245, 0.6);
  --color-text-dark: #1a1a3e;
  --color-text-dark-muted: rgba(26, 26, 62, 0.6);

  --gradient-sky: linear-gradient(165deg, #1a0533 0%, #2d0a4e 15%, #1e2f7a 35%, #1a3a7a 55%, #0d2e5e 75%, #0a2848 100%);
  --gradient-glass: linear-gradient(135deg, rgba(255,255,255,0.08) 0%, rgba(255,255,255,0.02) 100%);

  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-body: 'DM Sans', system-ui, -apple-system, sans-serif;

  --space-xs: clamp(0.25rem, 0.5vw, 0.5rem);
  --space-sm: clamp(0.5rem, 1vw, 1rem);
  --space-md: clamp(1rem, 2vw, 2rem);
  --space-lg: clamp(2rem, 4vw, 4rem);
  --space-xl: clamp(3rem, 6vw, 6rem);
  --space-2xl: clamp(4rem, 10vw, 10rem);

  --radius: 12px;
  --radius-lg: 24px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── Background ── */

.bg-gradient {
  background: var(--gradient-sky);
  min-height: 100vh;
  position: relative;
}

.bg-gradient::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 10%, rgba(74, 26, 122, 0.4) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 80%, rgba(0, 180, 216, 0.2) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

/* ── Stars / Particles ── */

.stars {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.star {
  position: absolute;
  width: 2px;
  height: 2px;
  background: white;
  border-radius: 50%;
  animation: twinkle var(--duration, 3s) ease-in-out infinite;
  opacity: 0;
}

@keyframes twinkle {
  0%, 100% { opacity: 0; }
  50% { opacity: var(--max-opacity, 0.6); }
}

/* ── Layout ── */

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-md);
  position: relative;
  z-index: 1;
}

/* ── Navigation ── */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-sm) 0;
  transition: background 0.4s ease, backdrop-filter 0.4s ease;
}

.nav.scrolled {
  background: rgba(26, 5, 51, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2vw, 1.5rem);
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--color-text);
  text-decoration: none;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: var(--space-md);
  list-style: none;
}

.nav-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: color 0.3s ease;
}

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

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  margin: 5px 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

/* ── Hero ── */

.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: var(--space-2xl) var(--space-md);
}

.hero-logo {
  margin-bottom: var(--space-lg);
  position: relative;
}

.hero-logo svg {
  width: clamp(120px, 20vw, 200px);
  height: auto;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 300;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: var(--space-xs);
  background: linear-gradient(135deg, var(--color-text) 0%, var(--color-cyan) 50%, var(--color-aqua) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-tagline {
  font-family: var(--font-display);
  font-size: clamp(1rem, 2vw, 1.4rem);
  font-weight: 300;
  font-style: italic;
  color: var(--color-text-muted);
  letter-spacing: 0.12em;
  margin-bottom: var(--space-xl);
}

.hero-since {
  font-size: 0.75rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-xl);
}

.hero-divider {
  width: 60px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-cyan), transparent);
  margin: 0 auto var(--space-lg);
}

.hero-stealth {
  max-width: 520px;
}

.hero-stealth h2 {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  font-weight: 400;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.hero-stealth p {
  font-size: clamp(0.85rem, 1.2vw, 1rem);
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* ── Hints Section ── */

.hints {
  padding: var(--space-xl) 0 var(--space-2xl);
}

.hints-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
}

.hint-card {
  background: linear-gradient(135deg, rgba(255,255,255,0.06) 0%, rgba(0,180,216,0.04) 100%);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: transform 0.4s ease, border-color 0.4s ease;
}

.hint-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 180, 216, 0.25);
}

.hint-icon {
  font-size: 1.8rem;
  margin-bottom: var(--space-sm);
  display: block;
  opacity: 0.7;
}

.hint-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 500;
  margin-bottom: var(--space-xs);
  letter-spacing: 0.04em;
}

.hint-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ── Contact CTA ── */

.cta-section {
  text-align: center;
  padding: var(--space-xl) 0 var(--space-2xl);
}

.cta-section p {
  font-family: var(--font-display);
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  font-style: italic;
}

.cta-email {
  display: inline-block;
  padding: 0.8rem 2.5rem;
  border: 1px solid rgba(0, 180, 216, 0.4);
  border-radius: 100px;
  color: var(--color-cyan);
  text-decoration: none;
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  transition: background 0.3s ease, color 0.3s ease;
}

.cta-email:hover {
  background: rgba(0, 180, 216, 0.12);
  color: var(--color-text);
}

/* ── Footer ── */

.footer {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: var(--space-lg) 0;
  text-align: center;
  position: relative;
  z-index: 1;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  list-style: none;
  margin-bottom: var(--space-sm);
}

.footer-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  transition: color 0.3s ease;
}

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

.footer-copy {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  opacity: 0.6;
}

/* ── Interior Pages ── */

.page {
  padding: calc(80px + var(--space-lg)) var(--space-md) var(--space-2xl);
}

.page-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.page-header h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 300;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-sm);
}

.page-header p {
  color: var(--color-text-muted);
  font-style: italic;
  font-size: 1rem;
}

.page-content {
  max-width: 720px;
  margin: 0 auto;
}

.page-content h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 500;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
  letter-spacing: 0.04em;
}

.page-content h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 500;
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
}

.page-content p {
  margin-bottom: var(--space-sm);
  color: var(--color-text-muted);
  line-height: 1.8;
  font-size: 0.95rem;
}

.page-content ul {
  margin-bottom: var(--space-sm);
  padding-left: 1.5rem;
}

.page-content li {
  color: var(--color-text-muted);
  line-height: 1.8;
  font-size: 0.95rem;
  margin-bottom: var(--space-xs);
}

.page-content a {
  color: var(--color-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 180, 216, 0.3);
  transition: border-color 0.3s ease;
}

.page-content a:hover {
  border-color: var(--color-cyan);
}

.page-content strong {
  color: var(--color-text);
  font-weight: 500;
}

.legal-date {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  opacity: 0.6;
  margin-bottom: var(--space-lg);
  text-align: center;
}

/* ── Reveal Animation ── */

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ── 404 ── */

.page-404 {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: var(--space-md);
}

.page-404 h1 {
  font-family: var(--font-display);
  font-size: clamp(4rem, 10vw, 8rem);
  font-weight: 300;
  letter-spacing: 0.2em;
  background: linear-gradient(135deg, var(--color-text) 0%, var(--color-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-404 p {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  margin-bottom: var(--space-md);
}

.page-404 a {
  color: var(--color-cyan);
  text-decoration: none;
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  border-bottom: 1px solid rgba(0, 180, 216, 0.3);
  transition: border-color 0.3s;
}

.page-404 a:hover {
  border-color: var(--color-cyan);
}

/* ── About Page Specifics ── */

.about-philosophy {
  text-align: center;
  padding: var(--space-lg) 0;
}

.about-philosophy blockquote {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.5vw, 1.8rem);
  font-style: italic;
  font-weight: 300;
  color: var(--color-text);
  line-height: 1.6;
  max-width: 600px;
  margin: 0 auto var(--space-md);
  position: relative;
}

.about-philosophy blockquote::before {
  content: '\201C';
  font-size: 4rem;
  position: absolute;
  top: -1.5rem;
  left: -1rem;
  color: var(--color-cyan);
  opacity: 0.3;
  font-family: var(--font-display);
}

/* ── Mobile ── */

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(26, 5, 51, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-lg);
    z-index: 99;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    font-size: 1.1rem;
  }

  .nav-toggle {
    display: block;
    z-index: 101;
  }

  .nav-toggle.open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle.open span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.open span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

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