/* ============================================================
   Numu2 — Design System
   Client: Doug Large
   Built: 2026-04-13
   ============================================================
   Principles:
   - Instant success over craft depth
   - Calm, not clever
   - Mom's eyes, kid's hands
   - Click to Amazon, always
   - Trust through specificity
   ============================================================ */

/* ============================================================
   1. Tokens
   ============================================================ */
:root {
  /* Colors — warm cream paper, navy trust, gold warmth */
  --color-bg: #fdfbf7;
  --color-surface: #ffffff;
  --color-ink: #1a1a1a;
  --color-ink-muted: #5a5a5a;
  --color-ink-subtle: #8a8a8a;
  --color-navy: #1a365d;
  --color-navy-dark: #0f2342;
  --color-navy-soft: #2b4a7a;
  --color-gold: #c89b3c;
  --color-gold-dark: #7a5b15;
  --color-gold-soft: #e8c97a;
  --color-border: #e8e2d5;
  --color-border-strong: #d4cbb8;
  --color-highlight: #fef6e0;

  /* Typography */
  --font-display: "Fraunces", "Playfair Display", Georgia, "Times New Roman", serif;
  --font-body: "Source Serif 4", "Source Serif Pro", Georgia, "Times New Roman", serif;

  --text-xs: 0.75rem;     /* 12 */
  --text-sm: 0.875rem;    /* 14 */
  --text-base: 1.0625rem; /* 17 — slightly larger body for reading */
  --text-lg: 1.1875rem;   /* 19 */
  --text-xl: 1.375rem;    /* 22 */
  --text-2xl: 1.625rem;   /* 26 */
  --text-3xl: 2rem;       /* 32 */
  --text-4xl: 2.5rem;     /* 40 */
  --text-5xl: 3.25rem;    /* 52 */
  --text-hero: 4.25rem;   /* 68 */

  --leading-tight: 1.1;
  --leading-snug: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.7;

  /* Spacing (8px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;
  --space-10: 8rem;
  --space-11: 12rem;

  /* Layout */
  --content-width: 42rem;    /* 672 — reading width */
  --container-width: 72rem;  /* 1152 — page container */
  --container-narrow: 56rem; /* 896 */

  /* Borders */
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;
  --border-thin: 1px solid var(--color-border);
  --border-med: 2px solid var(--color-border-strong);

  /* Shadows — subtle, never glow */
  --shadow-sm: 0 1px 2px rgba(26, 26, 26, 0.06);
  --shadow-md: 0 4px 12px rgba(26, 26, 26, 0.08);
  --shadow-lg: 0 14px 38px rgba(26, 26, 26, 0.10);

  /* Motion */
  --transition-fast: 120ms ease-out;
  --transition-base: 180ms ease-out;

  /* Z-index scale (fixed, no arbitrary values) */
  --z-base: 1;
  --z-raised: 10;
  --z-nav: 100;
  --z-modal: 1000;
}

/* ============================================================
   2. Reset + base
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--color-ink);
  background: var(--color-bg);
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img, svg, picture, video {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-navy);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-gold-dark);
}

a:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

button {
  font: inherit;
  cursor: pointer;
}

button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 2px;
}

::selection {
  background: var(--color-gold-soft);
  color: var(--color-ink);
}

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

/* ============================================================
   3. Typography
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: var(--leading-tight);
  color: var(--color-navy);
  margin: 0 0 var(--space-4) 0;
  text-wrap: balance;
  font-variation-settings: "opsz" 144, "SOFT" 30;
}

h1 { font-size: var(--text-5xl); font-weight: 800; }
h2 { font-size: var(--text-4xl); font-weight: 700; }
h3 { font-size: var(--text-2xl); font-weight: 700; }
h4 { font-size: var(--text-xl); font-weight: 600; }
h5 { font-size: var(--text-lg); font-weight: 600; }
h6 { font-size: var(--text-base); font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; }

p {
  margin: 0 0 var(--space-5) 0;
  text-wrap: pretty;
  max-width: 65ch;
}

strong, b {
  font-weight: 700;
}

em, i {
  font-style: italic;
}

/* Lede paragraph — the first paragraph after a heading */
.lede {
  font-size: var(--text-xl);
  color: var(--color-ink-muted);
  line-height: var(--leading-normal);
  max-width: 60ch;
}

/* Small caps eyebrow label above titles */
.eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-gold-dark);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin: 0 0 var(--space-3) 0;
  display: block;
}

/* ============================================================
   4. Layout utilities
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.container-narrow {
  width: 100%;
  max-width: var(--container-narrow);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.content {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.section {
  padding-block: var(--space-9);
}

.section-sm {
  padding-block: var(--space-7);
}

.section-lg {
  padding-block: var(--space-11);
}

.section-alt {
  background: var(--color-surface);
  border-block: var(--border-thin);
}

.stack > * + * {
  margin-top: var(--space-4);
}

.stack-lg > * + * {
  margin-top: var(--space-6);
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
}

.center {
  text-align: center;
}

.center-mx {
  margin-inline: auto;
}

/* ============================================================
   5. Navigation
   ============================================================ */
.site-nav {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background: rgba(253, 251, 247, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: var(--border-thin);
}

.site-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
  gap: var(--space-5);
}

.site-nav__brand {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-navy);
  text-decoration: none;
  letter-spacing: -0.02em;
  font-variation-settings: "opsz" 144;
}

.site-nav__brand:hover {
  color: var(--color-navy-dark);
}

.site-nav__menu {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav__link {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-ink-muted);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding-block: var(--space-2);
  transition: color var(--transition-fast);
}

.site-nav__link:hover,
.site-nav__link[aria-current="page"] {
  color: var(--color-navy);
}

@media (max-width: 640px) {
  .site-nav__inner {
    flex-direction: column;
    align-items: flex-start;
    padding-block: var(--space-3);
  }
  .site-nav__menu {
    gap: var(--space-4);
  }
  .site-nav__link {
    font-size: var(--text-xs);
  }
}

/* ============================================================
   6. Hero
   ============================================================ */
.hero {
  padding-block: var(--space-10) var(--space-9);
  background: var(--color-bg);
  position: relative;
}

.hero__inner {
  max-width: 60rem;
  margin-inline: auto;
  padding-inline: var(--space-5);
  text-align: center;
}

.hero__eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-gold-dark);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  margin-bottom: var(--space-5);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 800;
  line-height: 0.98;
  letter-spacing: -0.025em;
  color: var(--color-navy);
  margin: 0 0 var(--space-5) 0;
  text-wrap: balance;
  font-variation-settings: "opsz" 144, "SOFT" 30;
}

.hero__title em {
  font-style: italic;
  color: var(--color-gold-dark);
  font-weight: 700;
}

.hero__sub {
  font-family: var(--font-body);
  font-size: var(--text-xl);
  color: var(--color-ink-muted);
  line-height: var(--leading-normal);
  margin: 0 auto var(--space-7) auto;
  max-width: 42rem;
  text-wrap: pretty;
}

.hero__cta {
  display: inline-flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  justify-content: center;
}

@media (max-width: 720px) {
  .hero { padding-block: var(--space-8) var(--space-7); }
  .hero__title { font-size: var(--text-4xl); letter-spacing: -0.02em; }
  .hero__sub { font-size: var(--text-lg); }
}

/* ============================================================
   7. Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base), transform var(--transition-fast);
  min-height: 48px;
}

.btn:active {
  transform: translateY(1px);
}

.btn--primary {
  background: var(--color-navy);
  color: var(--color-bg);
  border-color: var(--color-navy);
}

.btn--primary:hover {
  background: var(--color-navy-dark);
  border-color: var(--color-navy-dark);
  color: var(--color-bg);
}

.btn--amazon {
  background: var(--color-gold);
  color: var(--color-ink);
  border-color: var(--color-gold-dark);
}

.btn--amazon:hover {
  background: var(--color-gold-dark);
  border-color: var(--color-gold-dark);
  color: var(--color-bg);
}

.btn--ghost {
  background: transparent;
  color: var(--color-navy);
  border-color: var(--color-border-strong);
}

.btn--ghost:hover {
  background: var(--color-surface);
  border-color: var(--color-navy);
}

.btn--large {
  padding: var(--space-5) var(--space-7);
  font-size: var(--text-lg);
  min-height: 56px;
}

.btn__arrow {
  font-size: 1.1em;
  transition: transform var(--transition-fast);
}

.btn:hover .btn__arrow {
  transform: translateX(3px);
}

/* ============================================================
   8. Cards & Books
   ============================================================ */
.card {
  background: var(--color-surface);
  border: var(--border-thin);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: box-shadow var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-strong);
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
  margin-block: var(--space-7);
}

.book {
  background: var(--color-surface);
  border: var(--border-thin);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  text-align: center;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.book:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-gold-soft);
}

.book__cover {
  aspect-ratio: 2 / 3;
  background: var(--color-bg);
  border: var(--border-thin);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-5);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-ink-subtle);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-style: italic;
  overflow: hidden;
}

.book__cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.book__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-navy);
  margin: 0 0 var(--space-2) 0;
  line-height: var(--leading-snug);
  text-wrap: balance;
}

.book__sub {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  margin: 0 0 var(--space-4) 0;
  font-style: italic;
}

.book__desc {
  font-size: var(--text-sm);
  color: var(--color-ink);
  line-height: var(--leading-normal);
  margin-bottom: var(--space-5);
  flex: 1;
}

.book__meta {
  font-size: var(--text-xs);
  color: var(--color-ink-subtle);
  font-variant-numeric: tabular-nums;
  margin-bottom: var(--space-4);
}

.book__cta {
  margin-top: auto;
}

/* ============================================================
   9. Testimonial
   ============================================================ */
.testimonial {
  background: var(--color-surface);
  border-left: 4px solid var(--color-gold);
  border-radius: var(--radius-md);
  padding: var(--space-6) var(--space-7);
  margin-block: var(--space-6);
  max-width: 52rem;
  margin-inline: auto;
}

.testimonial__quote {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  line-height: var(--leading-normal);
  color: var(--color-ink);
  margin: 0 0 var(--space-4) 0;
  font-style: italic;
  font-weight: 400;
  text-wrap: pretty;
}

.testimonial__quote::before {
  content: "\201C";
  font-size: 1.5em;
  line-height: 0;
  vertical-align: -0.3em;
  color: var(--color-gold);
  margin-right: 0.1em;
}

.testimonial__quote::after {
  content: "\201D";
  font-size: 1.5em;
  line-height: 0;
  vertical-align: -0.3em;
  color: var(--color-gold);
  margin-left: 0.1em;
}

.testimonial__author {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0;
}

.testimonial__author::before {
  content: "— ";
}

/* ============================================================
   10. Method comparison (numeric vs sheet music visual)
   ============================================================ */
.comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  margin-block: var(--space-7);
  border: var(--border-thin);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface);
}

.comparison__side {
  padding: var(--space-6);
  text-align: center;
}

.comparison__side--bad {
  background: var(--color-bg);
}

.comparison__side--good {
  background: var(--color-highlight);
  border-left: var(--border-thin);
}

.comparison__label {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-3);
}

.comparison__side--bad .comparison__label {
  color: var(--color-ink-subtle);
}

.comparison__side--good .comparison__label {
  color: var(--color-gold-dark);
}

.comparison__display {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 600;
  color: var(--color-ink);
  padding-block: var(--space-4);
  font-variant-numeric: tabular-nums;
}

.comparison__note {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  margin: 0;
  font-style: italic;
}

@media (max-width: 640px) {
  .comparison {
    grid-template-columns: 1fr;
  }
  .comparison__side--good {
    border-left: none;
    border-top: var(--border-thin);
  }
}

/* ============================================================
   11. Feature list (three-up)
   ============================================================ */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-6);
  margin-block: var(--space-7);
}

.feature {
  text-align: center;
  padding: var(--space-5);
}

.feature__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  background: var(--color-navy);
  color: var(--color-bg);
  border-radius: 50%;
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
  font-variant-numeric: tabular-nums;
}

.feature__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: var(--space-2);
}

.feature__desc {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  line-height: var(--leading-normal);
  margin: 0;
}

/* ============================================================
   12. Forms
   ============================================================ */
.form {
  max-width: 32rem;
  margin-inline: auto;
}

.field {
  margin-bottom: var(--space-5);
}

.field__label {
  display: block;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: var(--space-2);
}

.field__label .req {
  color: var(--color-gold-dark);
  margin-left: 2px;
}

.field__input,
.field__textarea {
  width: 100%;
  padding: var(--space-4);
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-ink);
  background: var(--color-surface);
  border: var(--border-thin);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast);
  min-height: 48px;
}

.field__input:hover,
.field__textarea:hover {
  border-color: var(--color-border-strong);
}

.field__input:focus,
.field__textarea:focus {
  border-color: var(--color-navy);
}

.field__textarea {
  min-height: 140px;
  resize: vertical;
  line-height: var(--leading-normal);
}

.field__help {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-ink-subtle);
  margin-top: var(--space-2);
}

/* ============================================================
   13. Footer
   ============================================================ */
.site-footer {
  background: var(--color-navy);
  color: var(--color-border);
  padding-block: var(--space-8);
  margin-top: var(--space-10);
}

.site-footer__inner {
  display: grid;
  gap: var(--space-6);
}

.site-footer__brand {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-bg);
  margin-bottom: var(--space-2);
  letter-spacing: -0.02em;
  font-variation-settings: "opsz" 144;
}

.site-footer__tag {
  font-family: var(--font-body);
  font-style: italic;
  color: var(--color-gold-soft);
  font-size: var(--text-base);
  margin-bottom: var(--space-5);
  max-width: 36rem;
}

.site-footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  list-style: none;
  margin: 0 0 var(--space-5) 0;
  padding: 0;
}

.site-footer__nav a {
  color: var(--color-gold-soft);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.site-footer__nav a:hover {
  color: var(--color-bg);
}

.site-footer__disclosure {
  font-size: var(--text-xs);
  color: rgba(232, 226, 213, 0.65);
  max-width: 52rem;
  line-height: var(--leading-normal);
  margin: var(--space-5) 0 0 0;
  padding-top: var(--space-5);
  border-top: 1px solid rgba(232, 226, 213, 0.2);
}

.site-footer__copyright {
  font-size: var(--text-xs);
  color: rgba(232, 226, 213, 0.55);
  margin: var(--space-3) 0 0 0;
  font-variant-numeric: tabular-nums;
}

/* ============================================================
   14. Accessibility helpers
   ============================================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-4);
  background: var(--color-navy);
  color: var(--color-bg);
  padding: var(--space-3) var(--space-5);
  text-decoration: none;
  border-radius: var(--radius-md);
  font-weight: 600;
  z-index: var(--z-modal);
}

.skip-link:focus {
  top: var(--space-4);
}

/* ============================================================
   15. Print
   ============================================================ */
@media print {
  .site-nav, .site-footer, .btn, .hero__cta {
    display: none;
  }
  body {
    background: white;
    color: black;
  }
  a::after {
    content: " (" attr(href) ")";
    font-size: 0.85em;
    color: #555;
  }
}