/* ========================================================
   Dr. Jorge Augusto Gómez Silva — Retina & Vítreo
   Sistema visual: cinematográfico, clínico, premium
   ======================================================== */

:root {
  /* Color tokens — Dark mode (default) */
  --bg-0: #000000;
  --bg-1: #07090d;
  --bg-2: #0d1117;
  --bg-3: #151b24;
  --surface: rgba(255, 255, 255, 0.03);
  --surface-hover: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);

  --fg-0: #ffffff;
  --fg-1: rgba(255, 255, 255, 0.92);
  --fg-2: rgba(255, 255, 255, 0.64);
  --fg-3: rgba(255, 255, 255, 0.44);
  --fg-4: rgba(255, 255, 255, 0.28);

  /* Accent — ZEISS-inspired blue + cyan */
  --accent: #1B41AA;          /* azul ZEISS */
  --accent-bright: #2E5BE0;
  --accent-glow: #4DA3FF;
  --cyan: #00E5FF;
  --cyan-soft: #6EE7FF;

  /* Clinical signal colors */
  --signal-warn: #FFB800;
  --signal-danger: #FF4D5E;
  --signal-ok: #2ED573;

  /* Type */
  --font-display: "Space Grotesk", "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "SF Mono", Menlo, monospace;

  /* Spacing scale */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 24px;
  --s-6: 32px;
  --s-7: 48px;
  --s-8: 64px;
  --s-9: 96px;
  --s-10: 128px;
  --s-11: 160px;
  --s-12: 200px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --container: 1440px;
  --content: 1200px;
  --reading: 720px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-soft: cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg-0: #ffffff;
  --bg-1: #f7f8fa;
  --bg-2: #eef1f5;
  --bg-3: #e3e7ee;
  --surface: rgba(0, 0, 0, 0.02);
  --surface-hover: rgba(0, 0, 0, 0.04);
  --border: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.16);

  --fg-0: #000000;
  --fg-1: rgba(0, 0, 0, 0.92);
  --fg-2: rgba(0, 0, 0, 0.64);
  --fg-3: rgba(0, 0, 0, 0.44);
  --fg-4: rgba(0, 0, 0, 0.28);
}

[data-density="compact"] {
  --s-7: 36px;
  --s-8: 48px;
  --s-9: 72px;
  --s-10: 96px;
  --s-11: 120px;
  --s-12: 150px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-0);
  color: var(--fg-1);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  overflow-x: hidden;
}

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

/* ==== Type system ==== */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--cyan);
  opacity: 0.7;
}

.eyebrow-muted { color: var(--fg-3); }
.eyebrow-muted::before { background: var(--fg-3); }

h1, .h1 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(48px, 7.2vw, 112px);
  line-height: 0.95;
  letter-spacing: -0.035em;
  margin: 0;
  color: var(--fg-0);
  text-wrap: balance;
}

h2, .h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(36px, 4.4vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.028em;
  margin: 0;
  color: var(--fg-0);
  text-wrap: balance;
}

h3, .h3 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(24px, 2vw, 32px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--fg-0);
}

h4, .h4 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 18px;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--fg-0);
}

.lead {
  font-size: clamp(17px, 1.4vw, 21px);
  line-height: 1.5;
  color: var(--fg-2);
  font-weight: 400;
  text-wrap: pretty;
  max-width: 60ch;
}

.body { font-size: 16px; line-height: 1.65; color: var(--fg-2); }
.body-sm { font-size: 14px; line-height: 1.6; color: var(--fg-2); }

.mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--fg-3);
}

/* ==== Buttons ==== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 22px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 220ms var(--ease-soft);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--fg-0);
  color: var(--bg-0);
  border-color: var(--fg-0);
}
.btn-primary:hover {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #001018;
  transform: translateY(-1px);
  box-shadow: 0 12px 40px -10px rgba(0, 229, 255, 0.5);
}

.btn-ghost {
  background: transparent;
  color: var(--fg-1);
  border-color: var(--border-strong);
}
.btn-ghost:hover {
  background: var(--surface-hover);
  border-color: var(--fg-2);
}

.btn-accent {
  background: var(--accent);
  color: var(--fg-0);
  border-color: var(--accent);
}
.btn-accent:hover {
  background: var(--accent-bright);
  border-color: var(--accent-bright);
  transform: translateY(-1px);
}

.btn-link {
  background: transparent;
  border: none;
  padding: 8px 0;
  color: var(--fg-1);
  font-weight: 500;
}
.btn-link:hover {
  color: var(--cyan);
}

.btn .arrow {
  display: inline-block;
  transition: transform 220ms var(--ease);
}
.btn:hover .arrow {
  transform: translateX(4px);
}

/* ==== Layout helpers ==== */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--s-6);
}

.content {
  max-width: var(--content);
  margin: 0 auto;
  padding: 0 var(--s-6);
}

@media (max-width: 768px) {
  .container, .content { padding: 0 var(--s-5); }
}

.section {
  padding: var(--s-11) 0;
  position: relative;
}

.section-tight { padding: var(--s-9) 0; }

.divider {
  height: 1px;
  background: var(--border);
  margin: 0;
}

/* ==== Section header ==== */
.section-head {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: var(--s-8);
  align-items: end;
  margin-bottom: var(--s-9);
}
@media (max-width: 900px) {
  .section-head {
    grid-template-columns: 1fr;
    gap: var(--s-5);
    margin-bottom: var(--s-7);
  }
}

/* ==== Cards ==== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--s-6);
  transition: all 280ms var(--ease);
}
.card:hover {
  background: var(--surface-hover);
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

/* ==== Grid utility ==== */
.grid { display: grid; gap: var(--s-5); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 1100px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
}

/* ==== Reveal animation ==== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 900ms var(--ease), transform 900ms var(--ease);
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 80ms; }
.reveal-delay-2 { transition-delay: 160ms; }
.reveal-delay-3 { transition-delay: 240ms; }
.reveal-delay-4 { transition-delay: 320ms; }

/* ==== Scrollbars ==== */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-1); }
::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 999px;
  border: 2px solid var(--bg-1);
}
::-webkit-scrollbar-thumb:hover { background: var(--fg-3); }

/* ==== Selection ==== */
::selection { background: var(--cyan); color: #001018; }

/* ==== Reduce motion ==== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* ==== Body when no-motion ==== */
[data-motion="off"] .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
[data-motion="off"] .hero-video { display: none !important; }
[data-motion="off"] .hero-fallback { display: block !important; }