/* ============================================================
   components.css — Artistic Composition shared components
   Header · Nav · Logo · Buttons · Cards · Paywall · Forms · Footer
   Requires: tokens.css loaded first
   ============================================================ */

/* ============================================================
   Reset and base
   ============================================================ */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--ac-font-body);
  font-size: var(--ac-text-body);
  line-height: var(--ac-lh-body);
  background-color: var(--ac-bg);
  color: var(--ac-ink);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--ac-ink);
  font-family: var(--ac-font-display);
  font-weight: 300;
  line-height: var(--ac-lh-h2);
}

h1 {
  font-size: var(--ac-text-h1);
  line-height: var(--ac-lh-h1);
  letter-spacing: var(--ac-ls-h1);
}

h2 {
  font-size: var(--ac-text-h2);
  letter-spacing: var(--ac-ls-h2);
}

h3 {
  font-size: var(--ac-text-h3);
  line-height: var(--ac-lh-h3);
  letter-spacing: var(--ac-ls-h3);
}

p {
  max-width: 68ch;
}

a {
  color: var(--ac-ink);
  text-decoration: none;
  transition: color var(--ac-transition);
}

a[target="_blank"] {
  /* Always paired with rel="noopener" in markup */
}

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

/* ============================================================
   Logo mark — SVG-only, square corners, brand rule
   Scale classes control width/height; aspect-ratio keeps square
   ============================================================ */

.ac-mark {
  display: block;
  flex-shrink: 0;
  aspect-ratio: 1;
}

.ac-mark--16  { width: 16px;  }
.ac-mark--24  { width: 24px;  }
.ac-mark--36  { width: 36px;  }
.ac-mark--48  { width: 48px;  }
.ac-mark--72  { width: 72px;  }
.ac-mark--128 { width: 128px; }

/* ============================================================
   Wordmark — stacked two-line lockup
   "Artistic" italic, "Composition" roman indented ~1em right
   ============================================================ */

.ac-wordmark {
  display: flex;
  flex-direction: column;
  font-family: var(--ac-font-mono);
  font-weight: 800;
  line-height: 1.0;
  color: var(--ac-ink);
  user-select: none;
}

.ac-wordmark em {
  font-style: normal;
  display: block;
}

.ac-wordmark span {
  display: block;
  font-weight: 800;
}

/* Size variants */
.ac-wordmark--xs { font-size: 13px; }
.ac-wordmark--sm { font-size: 16px; }
.ac-wordmark--md { font-size: 22px; }
.ac-wordmark--lg { font-size: 28px; }

/* ============================================================
   Lockup — mark + wordmark together
   ============================================================ */

.ac-lockup {
  display: inline-flex;
  align-items: center;
  gap: var(--ac-sp-3);
  text-decoration: none;
  flex-shrink: 0;
}

.ac-lockup:focus-visible {
  outline: 2px solid var(--ac-accent);
  outline-offset: 3px;
}

/* ============================================================
   Header
   ============================================================ */

.ac-header {
  position: sticky;
  top: 0;
  z-index: var(--ac-z-header);
  background-color: var(--ac-bg);
  border-bottom: 1px solid var(--ac-hair);
}

.ac-header__inner {
  max-width: var(--ac-max-width);
  margin: 0 auto;
  padding: 0 var(--ac-page-pad);
  height: 68px;
  display: flex;
  align-items: center;
  gap: var(--ac-sp-7);
}

/* ============================================================
   Navigation — desktop
   ============================================================ */

.ac-nav {
  display: flex;
  align-items: center;
  gap: var(--ac-sp-6);
  flex: 1;
}

.ac-nav__link {
  font-family: var(--ac-font-body);
  font-size: var(--ac-text-body-sm);
  font-weight: 400;
  color: var(--ac-ink);
  text-decoration: none;
  white-space: nowrap;
  position: relative;
  padding: 10px 0;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px; /* sit on the header's border-bottom */
  transition: border-color 180ms var(--ac-ease), color 180ms var(--ac-ease);
}

.ac-nav__link:hover {
  border-bottom-color: var(--ac-ink);
}

.ac-nav__link:focus-visible {
  outline: 2px solid var(--ac-accent);
  outline-offset: 3px;
}

/* Active state — accent (terracotta) underline at bottom of header */
.ac-nav__link.is-active,
.ac-nav__link--active {
  border-bottom-color: var(--ac-accent);
}

/* ============================================================
   Header actions — Sign in / Join or Account
   ============================================================ */

.ac-header__actions {
  display: flex;
  align-items: center;
  gap: var(--ac-sp-3);
  margin-left: auto;
  flex-shrink: 0;
}

/* Guest state: shown by default */
.ac-header__auth-guest {
  display: flex;
  align-items: center;
  gap: var(--ac-sp-3);
}

/* Member state: hidden until JS adds .is-authenticated to body */
.ac-header__auth-member {
  display: none;
}

body.is-authenticated .ac-header__auth-guest {
  display: none;
}

body.is-authenticated .ac-header__auth-member {
  display: flex;
  align-items: center;
  gap: var(--ac-sp-3);
}

/* ============================================================
   Hamburger — mobile only
   ============================================================ */

.ac-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--ac-sp-2);
  margin-left: auto;
  flex-shrink: 0;
}

.ac-hamburger__line {
  display: block;
  width: 22px;
  height: 1.5px;
  background-color: var(--ac-ink);
  transition: transform var(--ac-transition), opacity var(--ac-transition);
}

.ac-hamburger[aria-expanded="true"] .ac-hamburger__line:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.ac-hamburger[aria-expanded="true"] .ac-hamburger__line:nth-child(2) {
  opacity: 0;
}

.ac-hamburger[aria-expanded="true"] .ac-hamburger__line:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

.ac-hamburger:focus-visible {
  outline: 2px solid var(--ac-accent);
  outline-offset: 3px;
}

/* ============================================================
   Mobile nav sheet — full-screen dark overlay
   ============================================================ */

.ac-nav-sheet {
  position: fixed;
  inset: 0;
  z-index: var(--ac-z-nav-sheet);
  background-color: var(--ac-ink);
  color: var(--ac-bg);
  display: flex;
  flex-direction: column;
  padding: var(--ac-sp-5) var(--ac-page-pad-mobile);
  transform: translateX(100%);
  transition: transform var(--ac-transition);
  overflow-y: auto;
}

.ac-nav-sheet.is-open {
  transform: translateX(0);
}

.ac-nav-sheet__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--ac-sp-8);
}

.ac-nav-sheet__close {
  background: none;
  border: none;
  color: var(--ac-bg);
  font-size: 24px;
  cursor: pointer;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  margin-left: auto;
}

.ac-nav-sheet__close:focus-visible {
  outline: 2px solid var(--ac-accent);
  outline-offset: 3px;
}

.ac-nav-sheet__nav {
  display: flex;
  flex-direction: column;
  gap: var(--ac-sp-5);
  flex: 1;
}

.ac-nav-sheet__link {
  font-family: var(--ac-font-display);
  font-size: 24px;
  font-weight: 300;
  color: var(--ac-bg);
  text-decoration: none;
  letter-spacing: var(--ac-ls-h3);
}

.ac-nav-sheet__link:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.ac-nav-sheet__link:focus-visible {
  outline: 2px solid var(--ac-accent);
  outline-offset: 3px;
}

.ac-nav-sheet__actions {
  display: flex;
  flex-direction: column;
  gap: var(--ac-sp-3);
  margin-top: var(--ac-sp-8);
  padding-bottom: var(--ac-sp-7);
}

/* ============================================================
   Buttons
   Base → size modifiers → variant modifiers → state
   ============================================================ */

.ac-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--ac-sp-2);
  font-family: var(--ac-font-body);
  font-size: var(--ac-text-body-sm);
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
  border: 1px solid transparent;
  border-radius: 0; /* Brand rule — square corners */
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--ac-transition),
              color var(--ac-transition),
              border-color var(--ac-transition);
  padding: 14px 24px;
  /* Default size */
}

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

.ac-btn:focus-visible {
  outline: 2px solid var(--ac-accent);
  outline-offset: 3px;
}

.ac-btn:disabled,
.ac-btn[aria-disabled="true"] {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

/* Size variants */
.ac-btn--sm {
  font-size: 13px;
  padding: 10px 18px;
}

.ac-btn--lg {
  font-size: var(--ac-text-body);
  padding: 18px 32px;
}

.ac-btn--block {
  display: flex;
  width: 100%;
}

/* Variant: Accent (terracotta) — primary CTA, paywall, checkout */
.ac-btn--accent {
  background-color: var(--ac-accent);
  color: #fff;
  border-color: var(--ac-accent);
}

.ac-btn--accent:hover {
  background-color: var(--ac-accent-hover);
  border-color: var(--ac-accent-hover);
  color: #fff;
}

/* Variant: Primary (ink filled) — general primary actions */
.ac-btn--primary {
  background-color: var(--ac-ink);
  color: var(--ac-bg);
  border-color: var(--ac-ink);
}

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

/* Variant: Secondary (ink outline) — alongside a primary */
.ac-btn--secondary {
  background-color: transparent;
  color: var(--ac-ink);
  border-color: var(--ac-ink);
}

.ac-btn--secondary:hover {
  background-color: var(--ac-ink);
  color: var(--ac-bg);
}

/* Variant: Text (arrow-led, low-stakes) */
.ac-btn--text {
  background-color: transparent;
  color: var(--ac-ink);
  border-color: transparent;
  padding-left: 0;
  padding-right: 0;
}

.ac-btn--text:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* Variant overrides for dark backgrounds (nav sheet, footer) */
.ac-btn--secondary-light {
  background-color: transparent;
  color: var(--ac-bg);
  border-color: var(--ac-bg);
}

.ac-btn--secondary-light:hover {
  background-color: var(--ac-bg);
  color: var(--ac-ink);
}

/* ============================================================
   Mono eyebrow / label
   ============================================================ */

.ac-label {
  font-family: var(--ac-font-mono);
  font-size: var(--ac-text-label);
  font-weight: 500;
  letter-spacing: var(--ac-ls-label);
  text-transform: uppercase;
  color: var(--ac-muted);
  line-height: var(--ac-lh-label);
}

/* ============================================================
   Cards
   ============================================================ */

.ac-card {
  background-color: var(--ac-bg);
  border: 1px solid var(--ac-hair);
  padding: var(--ac-sp-7);
  border-radius: 0; /* Brand rule */
}

.ac-card__eyebrow {
  font-family: var(--ac-font-mono);
  font-size: var(--ac-text-label);
  font-weight: 500;
  letter-spacing: var(--ac-ls-label);
  text-transform: uppercase;
  color: var(--ac-muted);
  margin-bottom: var(--ac-sp-4);
}

.ac-card__title {
  font-size: var(--ac-text-h3);
  font-weight: 400;
  letter-spacing: var(--ac-ls-h3);
  margin-bottom: var(--ac-sp-3);
}

.ac-card__body {
  color: var(--ac-muted);
  font-size: var(--ac-text-body-sm);
}

/* ============================================================
   Paywall block (.ac-paywall)
   Shown on locked composition pages below the teaser fade
   ============================================================ */

.ac-paywall {
  background-color: var(--ac-paper);
  border: 1px solid var(--ac-hair);
  padding: var(--ac-sp-9) var(--ac-sp-7);
  text-align: center;
  border-radius: 0;
  position: relative;
  z-index: var(--ac-z-paywall);
}

.ac-paywall__lock {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border: 1px solid var(--ac-hair);
  margin: 0 auto var(--ac-sp-5);
  color: var(--ac-muted);
}

.ac-paywall__eyebrow {
  font-family: var(--ac-font-mono);
  font-size: var(--ac-text-label);
  font-weight: 500;
  letter-spacing: var(--ac-ls-label);
  text-transform: uppercase;
  color: var(--ac-accent);
  margin-bottom: var(--ac-sp-4);
}

.ac-paywall__headline {
  font-size: var(--ac-text-h2);
  font-weight: 300;
  letter-spacing: var(--ac-ls-h2);
  margin-bottom: var(--ac-sp-4);
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.ac-paywall__sub {
  font-size: var(--ac-text-body-sm);
  color: var(--ac-muted);
  margin-bottom: var(--ac-sp-6);
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

.ac-paywall__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--ac-sp-4);
  flex-wrap: wrap;
}

/* ============================================================
   Teaser fade (.ac-teaser)
   Content stays in DOM for SEO; gradient visually gates it
   ============================================================ */

.ac-teaser {
  position: relative;
}

.ac-teaser__locked {
  position: relative;
  /* Padding ensures the gradient covers real text, not just empty space */
  padding-bottom: 160px;
}

.ac-teaser__locked::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 320px;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    var(--ac-bg) 75%
  );
  pointer-events: none;
}

/* Remove fade for authenticated members */
body.is-member .ac-teaser__locked::after {
  display: none;
}

body.is-member .ac-paywall {
  display: none;
}

/* ============================================================
   Member-only content utility
   ============================================================ */

.ac-member-only {
  display: none;
}

body.is-member .ac-member-only {
  display: block;
}

/* ============================================================
   Forms
   ============================================================ */

.ac-form__group {
  display: flex;
  flex-direction: column;
  gap: var(--ac-sp-2);
  margin-bottom: var(--ac-sp-5);
}

.ac-form__label {
  font-family: var(--ac-font-mono);
  font-size: var(--ac-text-label);
  font-weight: 500;
  letter-spacing: var(--ac-ls-label);
  text-transform: uppercase;
  color: var(--ac-ink);
}

.ac-form__input,
.ac-form__textarea {
  width: 100%;
  font-family: var(--ac-font-body);
  font-size: var(--ac-text-body-sm);
  color: var(--ac-ink);
  background-color: var(--ac-bg);
  border: 1px solid var(--ac-hair);
  border-radius: 0; /* Brand rule */
  padding: 14px 16px;
  transition: border-color var(--ac-transition);
  appearance: none;
}

.ac-form__input:focus,
.ac-form__textarea:focus {
  outline: none;
  border-color: var(--ac-ink);
}

.ac-form__input:focus-visible,
.ac-form__textarea:focus-visible {
  outline: 2px solid var(--ac-accent);
  outline-offset: 2px;
}

.ac-form__textarea {
  resize: vertical;
  min-height: 120px;
}

.ac-form__error {
  font-size: var(--ac-text-body-sm);
  color: var(--ac-accent);
  margin-top: var(--ac-sp-2);
}

.ac-form__input.is-invalid,
.ac-form__textarea.is-invalid {
  border-color: var(--ac-accent);
}

.ac-form__input.is-invalid:focus,
.ac-form__textarea.is-invalid:focus {
  border-color: var(--ac-accent);
}

/* ============================================================
   Footer
   ============================================================ */

.ac-footer {
  background-color: var(--ac-ink);
  color: var(--ac-bg);
  padding: var(--ac-sp-9) var(--ac-page-pad) var(--ac-sp-7);
  margin-top: auto;
}

.ac-footer__inner {
  max-width: var(--ac-max-width);
  margin: 0 auto;
}

.ac-footer__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--ac-sp-8);
  margin-bottom: var(--ac-sp-9);
}

.ac-footer__col-heading {
  font-family: var(--ac-font-mono);
  font-size: var(--ac-text-label);
  font-weight: 500;
  letter-spacing: var(--ac-ls-label);
  text-transform: uppercase;
  color: var(--ac-bg);
  opacity: 0.5;
  margin-bottom: var(--ac-sp-5);
}

.ac-footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--ac-sp-4);
  list-style: none;
}

.ac-footer__link {
  font-size: var(--ac-text-body-sm);
  color: var(--ac-bg);
  opacity: 0.7;
  text-decoration: none;
  transition: opacity var(--ac-transition);
}

.ac-footer__link:hover {
  opacity: 1;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.ac-footer__link:focus-visible {
  outline: 2px solid var(--ac-accent);
  outline-offset: 3px;
  opacity: 1;
}

.ac-footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: var(--ac-sp-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--ac-sp-4);
}

.ac-footer__copy {
  font-size: var(--ac-text-body-sm);
  color: var(--ac-bg);
  opacity: 0.5;
}

/* ============================================================
   Main content area
   ============================================================ */

.ac-main {
  flex: 1;
  width: 100%;
}

.ac-container {
  max-width: var(--ac-max-width);
  margin: 0 auto;
  padding: 0 var(--ac-page-pad);
}

/* ============================================================
   Media queries
   ============================================================ */

/* 768px — main mobile breakpoint */
@media (max-width: 768px) {

  /* Breadcrumb */
  .comp-breadcrumb {
    padding: var(--ac-sp-4) var(--ac-page-pad-mobile);
  }

  /* Header */
  .ac-header__inner {
    padding: 0 var(--ac-page-pad-mobile);
    height: 58px;
    gap: var(--ac-sp-5);
  }

  /* Hide desktop nav and auth actions */
  .ac-nav,
  .ac-header__actions {
    display: none;
  }

  /* Show hamburger */
  .ac-hamburger {
    display: flex;
  }

  /* Footer: single column */
  .ac-footer {
    padding: var(--ac-sp-8) var(--ac-page-pad-mobile) var(--ac-sp-7);
  }

  .ac-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--ac-sp-7);
  }

  /* Paywall */
  .ac-paywall {
    padding: var(--ac-sp-7) var(--ac-sp-5);
  }

  .ac-paywall__actions {
    flex-direction: column;
  }

  .ac-paywall__actions .ac-btn {
    width: 100%;
  }

}

/* ============================================================
   Breadcrumb — shared across compositions + blog posts
   ============================================================ */

.comp-breadcrumb {
  max-width: var(--ac-max-width);
  margin: 0 auto;
  padding: var(--ac-sp-5) var(--ac-page-pad);
  display: flex;
  align-items: center;
  gap: var(--ac-sp-3);
  font-size: var(--ac-text-body-sm);
  color: var(--ac-muted);
  flex-wrap: wrap;
}

.comp-breadcrumb a {
  color: var(--ac-muted);
  text-decoration: none;
  transition: color var(--ac-transition);
}

.comp-breadcrumb a:hover {
  color: var(--ac-ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.comp-breadcrumb__sep {
  color: var(--ac-hair);
  user-select: none;
}

.comp-breadcrumb__current {
  color: var(--ac-ink);
}

/* 480px — small mobile */
@media (max-width: 480px) {

  .ac-footer__grid {
    grid-template-columns: 1fr;
  }

  .ac-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }

}