/* ALVA MINDS; design tokens */
:root {
  /* Core palette */
  --navy-900: #070F26;
  --navy-800: #0B1736;
  --navy-700: #111F44;
  --navy-600: #1A2B57;
  --navy-500: #253B72;
  --navy-400: #3B5598;
  --navy-300: #6A82B8;
  --navy-200: #A9B6D4;
  --navy-100: #D9DFEE;

  --cream-50:  #FBF9F4;
  --cream-100: #F7F4EE;
  --cream-200: #EFEADF;
  --cream-300: #E2DACB;

  --ink-900: #0A0F1F;
  --ink-700: #2A3040;
  --ink-500: #5A6278;
  --ink-400: #8A90A3;

  --orange-500: #F15A24;
  --orange-400: #F47248;
  --orange-600: #D24712;
  --orange-100: #FDE3D7;

  /* Roles */
  --bg: var(--cream-100);
  --bg-dark: var(--navy-800);
  --fg: var(--ink-900);
  --fg-muted: var(--ink-500);
  --accent: var(--orange-500);
  --line-dark: rgba(255, 255, 255, 0.08);
  --line-dark-strong: rgba(255, 255, 255, 0.16);
  --line-light: rgba(10, 15, 31, 0.08);
  --line-light-strong: rgba(10, 15, 31, 0.16);

  /* Type */
  --font-serif: "Instrument Serif", "Cormorant Garamond", ui-serif, Georgia, serif;
  --font-sans: "Inter", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, monospace;

  /* Spacing */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 18px;
  --radius-xl: 28px;

  --shadow-1: 0 1px 2px rgba(10,15,31,0.04), 0 4px 16px rgba(10,15,31,0.06);
  --shadow-2: 0 2px 4px rgba(10,15,31,0.06), 0 18px 48px rgba(10,15,31,0.10);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  color: var(--fg);
  background: var(--bg);
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.5;
}

h1, h2, h3, h4 { margin: 0; font-family: var(--font-serif); font-weight: 400; line-height: 1.05; letter-spacing: -0.01em; }
h1 { font-size: clamp(52px, 7.2vw, 116px); }
h2 { font-size: clamp(40px, 5.2vw, 82px); }
h3 { font-size: clamp(26px, 2.4vw, 38px); }
h4 { font-size: clamp(20px, 1.6vw, 26px); }
p { margin: 0; }

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

.mono { font-family: var(--font-mono); letter-spacing: 0.02em; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.eyebrow .dot {
  display: inline-block;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  vertical-align: middle;
  margin-right: 10px;
  transform: translateY(-1px);
}

.container {
  width: min(1320px, 100% - 56px);
  margin-inline: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.005em;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform .2s ease, background .2s ease, color .2s ease, border-color .2s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }

.btn-primary { background: var(--orange-500); color: white; }
.btn-primary:hover { background: var(--orange-600); }
.btn-ghost-dark { background: transparent; color: white; border-color: var(--line-dark-strong); }
.btn-ghost-dark:hover { background: rgba(255,255,255,.06); }
.btn-ghost-light { background: transparent; color: var(--ink-900); border-color: var(--line-light-strong); }
.btn-ghost-light:hover { background: rgba(0,0,0,.04); }
.btn-arrow::after {
  content: "→";
  display: inline-block;
  transition: transform .2s ease;
}
.btn-arrow:hover::after { transform: translateX(3px); }

/* Reveal on scroll */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .8s ease, transform .8s ease; }
.reveal.in { opacity: 1; transform: none; }

/* Image placeholder; per system prompt: no hand-drawn SVG imagery */
.img-placeholder {
  position: relative;
  background:
    repeating-linear-gradient(135deg,
      rgba(11,23,54,.06) 0 2px,
      transparent 2px 14px),
    linear-gradient(180deg, var(--cream-200), var(--cream-300));
  border: 1px solid var(--line-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  padding: 16px;
  color: var(--ink-500);
}
.img-placeholder.dark {
  background:
    repeating-linear-gradient(135deg,
      rgba(255,255,255,.04) 0 2px,
      transparent 2px 14px),
    linear-gradient(180deg, var(--navy-700), var(--navy-800));
  border-color: var(--line-dark);
  color: var(--navy-200);
}
.img-placeholder .label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}