/* ==========================================================================
   AMIVRA ARK / MARIAMA ECOSYSTEM — SHARED STYLESHEET
   One master visual system, one panoramic backdrop, five quiet crops.
   Sections: Tokens · Reset · Base · Layout · Backdrop · Components · Footer
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. TOKENS
   -------------------------------------------------------------------------- */
:root {
  --font-main: "Montserrat", "Segoe UI", system-ui, -apple-system, sans-serif;

  --fs-xs:   clamp(0.75rem, 0.72rem + 0.1vw, 0.8125rem);
  --fs-sm:   clamp(0.875rem, 0.83rem + 0.18vw, 0.95rem);
  --fs-base: clamp(1rem, 0.95rem + 0.2vw, 1.0625rem);
  --fs-md:   clamp(1.1rem, 1.02rem + 0.4vw, 1.25rem);
  --fs-lg:   clamp(1.3rem, 1.15rem + 0.8vw, 1.6rem);
  --fs-xl:   clamp(1.6rem, 1.3rem + 1.5vw, 2.1rem);
  --fs-2xl:  clamp(1.9rem, 1.5rem + 2.2vw, 2.7rem);
  --fs-3xl:  clamp(2.2rem, 1.7rem + 3.2vw, 3.4rem);

  --lh-tight: 1.15;
  --lh-snug: 1.35;
  --lh-normal: 1.6;
  --lh-relaxed: 1.7;

  --tracking-wide: 0.07em;
  --tracking-wider: 0.14em;

  /* Space (4px scale) — compact */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.4rem;
  --space-6: 1.9rem;
  --space-7: 2.2rem;
  --space-8: 2.8rem;

  --section-pad-y: clamp(1.6rem, 2.8vw + 0.8rem, 2.9rem);
  --container-max: 1180px;
  --container-pad: clamp(1.25rem, 4vw, 2.75rem);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-pill: 999px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 0.3s;

  --shadow-soft: 0 14px 36px -18px rgba(0, 0, 0, 0.5);

  --z-header: 100;
  --z-nav: 110;

  /* One restrained palette, used everywhere */
  --bg-base: #14161a;
  --text: #f3f1ea;
  --text-muted: rgba(243, 241, 234, 0.72);
  --surface: rgba(255, 255, 255, 0.11);
  --surface-strong: rgba(255, 255, 255, 0.17);
  --surface-border: rgba(255, 255, 255, 0.17);
  --accent: #cdb78f;
  --scrim-top: rgba(10, 11, 13, 0.2);
  --scrim-bottom: rgba(8, 9, 10, 0.82);

  --bg-pos: 0%;
}

/* --------------------------------------------------------------------------
   2. RESET
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
html, body { margin: 0; padding: 0; }

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

ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p, figure, blockquote { margin: 0; }

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; padding: 0; }
input, textarea, select { font: inherit; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* --------------------------------------------------------------------------
   3. BASE
   -------------------------------------------------------------------------- */
body {
  font-family: var(--font-main);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  font-weight: 400;
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-weight: 500;
  line-height: var(--lh-tight);
  letter-spacing: -0.01em;
}

p { color: var(--text-muted); }

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -100px;
  background: #111;
  color: #fff;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  z-index: 999;
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: var(--space-4); }

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

.section { position: relative; padding-block: var(--section-pad-y); }
.section--tight { padding-block: clamp(1.8rem, 3vw, 3rem); }

.section__head { max-width: 42rem; margin-bottom: var(--space-6); }
.section__head--center { margin-inline: auto; text-align: center; }

.eyebrow {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-2);
}

.section__title { font-size: var(--fs-2xl); margin-bottom: var(--space-3); }

.section__lead {
  font-size: var(--fs-md);
  color: var(--text-muted);
  line-height: var(--lh-relaxed);
  max-width: 36rem;
}

.section__head--center .section__lead { margin-inline: auto; }

.prose { max-width: 40rem; }
.prose p { margin-bottom: var(--space-4); font-size: var(--fs-base); line-height: var(--lh-relaxed); }
.prose p:last-child { margin-bottom: 0; }
.prose strong { color: var(--text); font-weight: 600; }

.credentials-line {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-4);
  font-size: var(--fs-sm);
  color: var(--text-muted);
}

.credentials-badge { width: 26px; height: 26px; object-fit: contain; border-radius: 4px; flex-shrink: 0; }

.text-muted { color: var(--text-muted); }

.grid { display: grid; gap: var(--space-5); }

@media (min-width: 640px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .grid--4 { grid-template-columns: repeat(4, 1fr); }
}

/* --------------------------------------------------------------------------
   5. BACKDROP — one panoramic master background, cropped per page
   Tonal flow: Music (darkest/coolest) -> Home -> MariAma -> Practice -> Books (warmest)
   Single master photo (assets/img/background-master.jpg), one continuous
   ribbon — each page shows a different horizontal slice via background-position.

   Implemented as a fixed full-viewport layer (.backdrop), not body's own
   background: a real position:fixed element always sizes against the
   viewport, while background-attachment:fixed sizes percentage backgrounds
   against the element's own (often much taller, on mobile) box — that
   mismatch is why mobile previously showed a different crop than desktop.
   -------------------------------------------------------------------------- */
body { background-color: var(--bg-base); }

.backdrop {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(180deg, var(--scrim-top) 0%, rgba(9, 10, 12, 0.5) 55%, var(--scrim-bottom) 100%),
    url("../img/background-master.jpg");
  background-size: 100% 100%, cover;
  background-position: 0 0, var(--bg-pos) center;
  background-repeat: no-repeat, no-repeat;
}

body.zone-music    { --bg-pos: 0%; }
body.zone-home      { --bg-pos: 22%; }
body.zone-mariama   { --bg-pos: 45%; }
body.zone-practice  { --bg-pos: 68%; }
body.zone-books     { --bg-pos: 100%; }

/* Home hero runs brighter on its right edge than the rest of the ribbon;
   trim it slightly so the first screen reads as balanced. */
body.zone-home .backdrop::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(6, 7, 8, 0) 38%, rgba(6, 7, 8, 0.56) 100%);
}

/* --------------------------------------------------------------------------
   6. COMPONENTS — Header / Nav
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  border-bottom: 1px solid var(--surface-border);
}

/* The blur lives on a ::before, not on .site-header itself: filter/backdrop-filter
   on an ancestor creates a new containing block for position:fixed descendants,
   which broke #primary-nav's full-viewport overlay on mobile (it was anchoring
   to the header's own box instead of the viewport). Keeping it off .site-header
   keeps the same visual blur without trapping the fixed nav. */
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  backdrop-filter: blur(14px) saturate(1.1);
  -webkit-backdrop-filter: blur(14px) saturate(1.1);
  background: linear-gradient(to bottom, rgba(8, 9, 11, 0.55), rgba(8, 9, 11, 0.15));
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-3);
}

.brand { display: inline-flex; align-items: center; gap: var(--space-2); }
.brand__mark {
  width: 33px;
  height: 33px;
  object-fit: contain;
  filter: drop-shadow(0 1px 5px rgba(0, 0, 0, 0.55));
}
.brand__name {
  display: inline-flex;
  flex-direction: column;
  font-size: var(--fs-base);
  font-weight: 600;
  letter-spacing: 0.01em;
  line-height: 1.1;
}

.brand__sub {
  display: block;
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  line-height: 1.1;
  color: rgba(243, 241, 234, 0.85);
  text-transform: uppercase;
  margin-top: 1px;
}

.nav-toggle {
  position: relative;
  z-index: var(--z-nav);
  width: 38px;
  height: 38px;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.nav-toggle__bar {
  width: 21px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-nav) - 1);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(10, 10, 12, 0.97);
  backdrop-filter: blur(10px);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur) var(--ease);
}

.nav.is-open { opacity: 1; visibility: visible; }

.nav__list { display: flex; flex-direction: column; align-items: center; gap: var(--space-5); }
.nav__list a { font-size: var(--fs-lg); font-weight: 500; color: #f3f2ef; }
.nav__list a.is-active { color: var(--accent); }

@media (min-width: 900px) {
  .nav-toggle { display: none; }

  .nav {
    position: static; inset: auto;
    background: none; backdrop-filter: none;
    opacity: 1; visibility: visible; width: auto;
  }

  .nav__list { flex-direction: row; gap: var(--space-6); }

  .nav__list a {
    font-size: var(--fs-sm);
    font-weight: 500;
    color: var(--text);
    letter-spacing: 0.01em;
    position: relative;
    padding-bottom: 4px;
  }

  .nav__list a::after {
    content: "";
    position: absolute;
    left: 0; bottom: 0;
    width: 0; height: 1px;
    background: var(--accent);
    transition: width var(--dur) var(--ease);
  }

  .nav__list a:hover::after,
  .nav__list a.is-active::after { width: 100%; }

  .nav__list a.is-active { color: var(--text); }
}

/* --------------------------------------------------------------------------
   6b. COMPONENTS — Hero
   -------------------------------------------------------------------------- */
.hero {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-block: var(--space-8) var(--space-6);
}

.hero__title { font-size: var(--fs-3xl); margin-bottom: var(--space-4); max-width: 19ch; }

/* Internal pages (Music, MariAma, Practice, Books & Tools) carry a shorter,
   lighter first screen than Home: a smaller, tighter heading and reduced
   top padding keep them from feeling top-heavy. */
body:not(.zone-home) .hero { padding-block: var(--space-6) var(--space-5); }

body:not(.zone-home) .hero__title {
  font-size: clamp(1.6rem, 1.35rem + 2vw, 2.3rem);
  letter-spacing: -0.015em;
}

.hero__lead {
  font-size: var(--fs-md);
  color: var(--text-muted);
  max-width: 40ch;
  line-height: var(--lh-relaxed);
  margin-bottom: var(--space-5);
}

.hero__actions { display: flex; flex-wrap: wrap; gap: var(--space-3); }

/* --------------------------------------------------------------------------
   6c. COMPONENTS — Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  padding: 0.8em 1.5em;
  border-radius: var(--radius-pill);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
  white-space: nowrap;
}

.btn:hover { transform: translateY(-2px); }

.btn--primary { background: var(--text); color: #15151a; }
.btn--primary:hover { background: var(--accent); color: #15151a; }

.btn--ghost { background: transparent; border: 1px solid var(--surface-border); color: var(--text); }
.btn--ghost:hover { border-color: var(--accent); background: var(--surface); }

.btn--sm { padding: 0.6em 1.2em; font-size: var(--fs-xs); }
.btn .icon { width: 16px; height: 16px; flex-shrink: 0; }

/* --------------------------------------------------------------------------
   6d. COMPONENTS — Cards
   -------------------------------------------------------------------------- */
.card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  height: 100%;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

a.card:hover, .card.is-interactive:hover {
  transform: translateY(-3px);
  background: var(--surface-strong);
  box-shadow: var(--shadow-soft);
}

.card__title { font-size: var(--fs-md); margin-bottom: var(--space-2); }
.card__text { font-size: var(--fs-sm); color: var(--text-muted); line-height: var(--lh-relaxed); }

.card__meta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-3);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--accent);
}

/* --------------------------------------------------------------------------
   6e. COMPONENTS — Destination / platform links
   -------------------------------------------------------------------------- */
.dest-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

@media (min-width: 640px) { .dest-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1024px) { .dest-grid--6 { grid-template-columns: repeat(6, 1fr); } }
@media (min-width: 1024px) { .dest-grid--4 { grid-template-columns: repeat(4, 1fr); } }

.dest-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  text-align: center;
  padding: var(--space-4) var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--surface-border);
  background: var(--surface);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.dest-link:hover { transform: translateY(-3px); background: var(--surface-strong); }
.dest-link .icon { width: 22px; height: 22px; color: var(--accent); }
.dest-link__label { font-size: var(--fs-xs); font-weight: 600; letter-spacing: 0.02em; }

/* --------------------------------------------------------------------------
   6f. COMPONENTS — Use-case list
   -------------------------------------------------------------------------- */
.usecases { display: grid; gap: var(--space-3); }

@media (min-width: 768px) { .usecases { grid-template-columns: repeat(2, 1fr); } }

.usecases__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--surface-border);
  background: var(--surface);
  font-size: var(--fs-sm);
  line-height: var(--lh-relaxed);
}

.usecases__item .icon { width: 16px; height: 16px; color: var(--accent); margin-top: 3px; flex-shrink: 0; }

/* --------------------------------------------------------------------------
   6g. COMPONENTS — Footer
   -------------------------------------------------------------------------- */
.site-footer { border-top: 1px solid var(--surface-border); padding-block: var(--space-7) var(--space-5); }

.site-footer__top { display: grid; gap: var(--space-6); margin-bottom: var(--space-6); }

@media (min-width: 768px) { .site-footer__top { grid-template-columns: 1.2fr 2fr; } }

.site-footer__brand p { margin-top: var(--space-3); max-width: 28ch; font-size: var(--fs-sm); line-height: 1.5; color: rgba(243, 241, 234, 0.86); }

.footer-cols { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-5); }

@media (min-width: 640px) { .footer-cols { grid-template-columns: repeat(3, 1fr); } }

.footer-col h4 {
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--accent);
  margin-bottom: var(--space-2);
  font-weight: 600;
}

.footer-col a, .footer-col span {
  display: block;
  font-size: var(--fs-sm);
  line-height: 1.5;
  color: rgba(243, 241, 234, 0.88);
  padding-block: var(--space-1);
  transition: color var(--dur) var(--ease);
}

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

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-top: var(--space-5);
  border-top: 1px solid var(--surface-border);
}

.footer-meta { display: flex; align-items: center; gap: var(--space-3); font-size: var(--fs-sm); color: rgba(243, 241, 234, 0.85); }

.footer-social { display: flex; gap: var(--space-4); }
.footer-social a { color: var(--text-muted); }
.footer-social a:hover { color: var(--accent); }
.footer-social .icon { width: 18px; height: 18px; }

/* --------------------------------------------------------------------------
   7. PAGE helpers
   -------------------------------------------------------------------------- */
.split { display: grid; gap: var(--space-6); align-items: start; }

@media (min-width: 1024px) {
  .split--2 { grid-template-columns: repeat(2, 1fr); }
}

/* About MariAma (Home): give the heading column more visual weight than
   the surrounding prose so it reads as the section's anchor, not a peer. */
#about .split--2 > div:first-child {
  border-left: 2px solid var(--accent);
  padding-left: var(--space-5);
}
#about .section__title { font-size: var(--fs-2xl); font-weight: 600; }

.icon { flex-shrink: 0; display: inline-block; }

.divider { height: 1px; background: var(--surface-border); margin-block: var(--space-7); }

/* --------------------------------------------------------------------------
   8. Gentle reveal-on-scroll (progressive enhancement; see main.js)
   -------------------------------------------------------------------------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.55s var(--ease), transform 0.55s var(--ease); }
.reveal--visible { opacity: 1; transform: translateY(0); }