/* =============================================================
   There and Back Again — main.css
   A leather-bound travel journal, worn and beloved.
   ============================================================= */

/* ── Custom Properties ───────────────────────────────────────── */

:root {
  /* Backgrounds */
  --colour-page:        #f5f0e8;   /* aged parchment — primary background */
  --colour-surface:     #ede8dc;   /* slightly darker parchment — cards, panels */
  --colour-surface-alt: #e4ddd0;   /* worn cream — hover states, accents */

  /* Ink / Text */
  --colour-ink:         #1e1a14;   /* espresso — primary text, not pure black */
  --colour-ink-mid:     #4a4035;   /* walnut — secondary text, captions */
  --colour-ink-light:   #6b5f50;   /* faded ink — metadata, timestamps (darkened from design.md #8a7d6b to pass WCAG AA 4.5:1) */

  /* Accent */
  --colour-leather:     #7a4f2d;   /* worn leather — links, active states */
  --colour-leather-dark:#5c3820;   /* deep leather — hover on links */
  --colour-rust:        #b05c2f;   /* rust — occasional decorative accent */

  /* Borders & Dividers */
  --colour-border:      #c8bfb0;   /* pale ink — subtle borders */
  --colour-border-dark: #a09080;   /* aged border — stronger dividers */

  /* Lightbox overlay */
  --colour-overlay:     rgba(30, 26, 20, 0.92);

  /* Typography */
  --font-display:  'Playfair Display', Georgia, serif;
  --font-body:     'Crimson Text', Georgia, serif;
  --font-accent:   'IM Fell English', Georgia, serif;

  /* Type scale */
  --text-xs:   0.75rem;    /* 12px — metadata, timestamps */
  --text-sm:   0.875rem;   /* 14px — captions, labels */
  --text-base: 1.125rem;   /* 18px — body copy */
  --text-lg:   1.375rem;   /* 22px — lead paragraph */
  --text-xl:   1.75rem;    /* 28px — section headings */
  --text-2xl:  2.5rem;     /* 40px — page headings */
  --text-3xl:  3.5rem;     /* 56px — site title / hero */

  --line-height-tight:  1.15;
  --line-height-normal: 1.75;
  --line-height-loose:  1.9;

  /* Spacing — 8px base unit */
  --space-1:   0.25rem;  /*  4px */
  --space-2:   0.5rem;   /*  8px */
  --space-3:   0.75rem;  /* 12px */
  --space-4:   1rem;     /* 16px */
  --space-6:   1.5rem;   /* 24px */
  --space-8:   2rem;     /* 32px */
  --space-12:  3rem;     /* 48px */
  --space-16:  4rem;     /* 64px */
  --space-24:  6rem;     /* 96px */

  /* Layout */
  --container-max:    1200px;
  --container-gutter: var(--space-6);

  /* Transitions — analogue, unhurried */
  --transition-base: 280ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
}

/* ── Reset ───────────────────────────────────────────────────── */

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

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

body {
  background-color: var(--colour-page);
  color: var(--colour-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--line-height-normal);
  min-height: 100vh;
  /* Grain texture overlay via pseudo-element on body */
  position: relative;
}

/* Paper grain texture — fixed SVG feTurbulence noise overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 128px 128px;
}

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

input, button, textarea, select {
  font: inherit;
}

p, h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word;
}

ul, ol {
  list-style: none;
}

a {
  color: var(--colour-leather);
  text-decoration: none;
  transition: color var(--transition-base);
}

a:hover,
a:focus-visible {
  color: var(--colour-leather-dark);
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 3px;
}

/* ── Base Typography ─────────────────────────────────────────── */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: var(--line-height-tight);
  color: var(--colour-ink);
}

h1 { font-size: var(--text-2xl); }
h2 { font-size: var(--text-xl); }
h3 { font-size: var(--text-lg); }
h4 { font-size: var(--text-base); }
h5 { font-size: var(--text-sm); }
h6 { font-size: var(--text-xs); }

p {
  margin-bottom: var(--space-4);
}

p:last-child {
  margin-bottom: 0;
}

/* design.md: use italic for emphasis, never bold body text */
strong {
  font-style: italic;
  font-weight: 400;
}

em {
  font-style: italic;
}

blockquote {
  font-family: var(--font-accent);
  font-style: italic;
  font-size: var(--text-lg);
  color: var(--colour-ink-mid);
  border-left: 3px solid var(--colour-border);
  padding-left: var(--space-6);
  margin: var(--space-8) 0;
  line-height: var(--line-height-loose);
}

/* design.md: ink-brush style divider — never a plain <hr> */
.divider {
  border: none;
  text-align: center;
  color: var(--colour-ink-light);
  font-family: var(--font-accent);
  font-size: var(--text-xl);
  letter-spacing: 0.3em;
  margin: var(--space-8) 0;
  user-select: none;
}

time, .meta {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--colour-ink-light);
  letter-spacing: 0.04em;
}

/* Uppercase labels — design.md: letter-spacing 0.12em */
.label {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--colour-ink-light);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* Journal stamp styling from design.md */
.journal-stamp {
  font-family: var(--font-accent);
  font-style: italic;
  font-size: var(--text-sm);
  color: var(--colour-ink-light);
  letter-spacing: 0.05em;
}

/* ── Layout Utilities ────────────────────────────────────────── */

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

/* ── Focus Styles ────────────────────────────────────────────── */

:focus-visible {
  outline: 2px solid var(--colour-leather);
  outline-offset: 3px;
  border-radius: 1px;
}

/* ── Skip Link ───────────────────────────────────────────────── */

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--colour-ink);
  color: var(--colour-page);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-family: var(--font-body);
  z-index: 10000;
  transition: top var(--transition-base);
}

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

/* ── Site Header ─────────────────────────────────────────────── */

.site-header {
  background-color: var(--colour-page);
  border-bottom: 1px solid var(--colour-border);
  padding: var(--space-6) 0;
}

.site-header .container {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-4);
}

.site-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--colour-ink);
  letter-spacing: -0.02em;
  line-height: 1;
  text-decoration: none;
}

.site-title:hover,
.site-title:focus-visible {
  color: var(--colour-leather);
  text-decoration: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.site-nav a {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--colour-ink-mid);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  transition: color var(--transition-base);
}

.site-nav a:hover,
.site-nav a:focus-visible,
.site-nav a[aria-current="page"] {
  color: var(--colour-leather);
  text-decoration: none;
}

/* ── Breadcrumb ──────────────────────────────────────────────── */

.breadcrumb {
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--colour-border);
  background-color: var(--colour-page);
}

.breadcrumb ol {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--colour-ink-light);
}

.breadcrumb li + li::before {
  content: '→';
  margin-right: var(--space-2);
  color: var(--colour-ink-light);
}

.breadcrumb a {
  color: var(--colour-ink-mid);
}

.breadcrumb a:hover {
  color: var(--colour-leather);
}

.breadcrumb [aria-current="page"] {
  color: var(--colour-ink);
}

/* ── Footer ──────────────────────────────────────────────────── */

.site-footer {
  background-color: var(--colour-surface);
  border-top: 1px solid var(--colour-border);
  padding: var(--space-8) 0;
  margin-top: var(--space-24);
}

.site-footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.site-footer p {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--colour-ink-light);
  margin-bottom: 0;
}

/* ── Hero Section ────────────────────────────────────────────── */

.hero {
  position: relative;
  margin-bottom: var(--space-16);
}

.hero__image-wrap {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  max-height: 600px;
}

.hero__image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero__caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-6);
  background: linear-gradient(to top, rgba(30, 26, 20, 0.75) 0%, transparent 100%);
}

.hero__caption p {
  font-family: var(--font-accent);
  font-style: italic;
  font-size: var(--text-lg);
  color: var(--colour-page);
  margin-bottom: 0;
  max-width: 480px;
  line-height: var(--line-height-loose);
}

/* ── Trip Cards ──────────────────────────────────────────────── */

.trip-index {
  margin-bottom: var(--space-16);
}

.trip-index__heading {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 400;
  color: var(--colour-ink-light);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--colour-border);
}

.trip-card {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-bottom: var(--space-12);
  border-top: 1px solid var(--colour-border);
  padding-top: var(--space-8);
}

.trip-card__image-wrap {
  overflow: hidden;
  aspect-ratio: 4 / 3;
}

.trip-card__image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform var(--transition-slow);
}

.trip-card:hover .trip-card__image-wrap img {
  transform: scale(1.02);
}

.trip-card__body {
  padding: var(--space-6) 0 0;
}

.trip-card__meta {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--colour-ink-light);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

.trip-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--colour-ink);
  margin-bottom: var(--space-3);
  line-height: var(--line-height-tight);
}

.trip-card__excerpt {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--colour-ink-mid);
  line-height: var(--line-height-normal);
  margin-bottom: var(--space-4);
}

.trip-card__count {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--colour-ink-light);
  margin-bottom: var(--space-4);
}

.trip-card__link {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--colour-leather);
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--colour-leather);
  padding-bottom: 1px;
  text-decoration: none;
  transition: color var(--transition-base), border-color var(--transition-base);
}

.trip-card__link:hover,
.trip-card__link:focus-visible {
  color: var(--colour-leather-dark);
  border-color: var(--colour-leather-dark);
  text-decoration: none;
}

/* ── Trip Gallery Page ───────────────────────────────────────── */

.trip-header {
  padding: var(--space-12) 0 var(--space-8);
  border-bottom: 1px solid var(--colour-border);
  margin-bottom: var(--space-12);
}

.trip-header__location {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--colour-ink-light);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

.trip-header__title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-4);
}

.trip-header__date {
  font-family: var(--font-accent);
  font-style: italic;
  font-size: var(--text-base);
  color: var(--colour-ink-mid);
  margin-bottom: var(--space-6);
}

.trip-header__intro {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  color: var(--colour-ink-mid);
  line-height: var(--line-height-normal);
  max-width: 600px;
}

/* ── Photo Grid ──────────────────────────────────────────────── */

.photo-grid {
  columns: 1;
  column-gap: var(--space-6);
  margin-bottom: var(--space-16);
}

/* design.md: box-shadow for "prints on a surface" feel, --card-tilt set per card by JS */
.photo-card {
  break-inside: avoid;
  margin-bottom: var(--space-6);
  position: relative;
  cursor: pointer;
  border-radius: 2px;
  box-shadow:
    0 1px 3px rgba(30, 26, 20, 0.12),
    0 4px 12px rgba(30, 26, 20, 0.10),
    0 0 0 1px rgba(30, 26, 20, 0.06);
  transform: rotate(var(--card-tilt, 0deg));
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

/* design.md: subtle lift on hover, shadow deepens */
.photo-card:hover,
.photo-card:focus-visible {
  transform: rotate(var(--card-tilt, 0deg)) translateY(-2px);
  box-shadow:
    0 2px 6px rgba(30, 26, 20, 0.16),
    0 8px 20px rgba(30, 26, 20, 0.14),
    0 0 0 1px rgba(30, 26, 20, 0.08);
}

.photo-card__image-wrap {
  overflow: hidden;
  position: relative;
  border-radius: 2px;
}

.photo-card__image-wrap img {
  width: 100%;
  height: auto;
  display: block;
}

.photo-card__caption {
  padding: var(--space-2) var(--space-3) var(--space-3);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--colour-ink-mid);
  font-style: italic;
  background-color: var(--colour-page);
  border-radius: 0 0 2px 2px;
}

/* Journal stamp — appears on hover */
.photo-card__stamp {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  background-color: var(--colour-page);
  color: var(--colour-ink-mid);
  font-family: var(--font-accent);
  font-style: italic;
  font-size: var(--text-xs);
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--colour-border);
  letter-spacing: 0.05em;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity var(--transition-base), transform var(--transition-base);
  pointer-events: none;
  white-space: nowrap;
}

.photo-card:hover .photo-card__stamp,
.photo-card:focus-within .photo-card__stamp {
  opacity: 1;
  transform: translateY(0);
}

/* ── Lightbox ────────────────────────────────────────────────── */

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background-color: var(--colour-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  /* design.md: fade in/out — never slide or zoom */
  transition: opacity var(--transition-slow);
}

.lightbox.is-open {
  opacity: 1;
  pointer-events: all;
}

.lightbox__inner {
  position: relative;
  max-width: min(90vw, 1200px);
  max-height: 92vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lightbox__image-wrap {
  position: relative;
}

.lightbox__image-wrap img {
  max-width: min(90vw, 1200px);
  max-height: 78vh;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
}

.lightbox__meta {
  padding: var(--space-4) 0 0;
  text-align: center;
  width: 100%;
}

.lightbox__caption {
  font-family: var(--font-accent);
  font-style: italic;
  font-size: var(--text-base);
  color: var(--colour-page);
  margin-bottom: var(--space-2);
}

.lightbox__stamp {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--colour-ink-light);
  letter-spacing: 0.06em;
}

.lightbox__close {
  position: absolute;
  top: calc(-1 * var(--space-8));
  right: 0;
  background: none;
  border: none;
  color: var(--colour-page);
  font-size: var(--text-xl);
  cursor: pointer;
  padding: var(--space-2);
  line-height: 1;
  transition: color var(--transition-base);
}

.lightbox__close:hover,
.lightbox__close:focus-visible {
  color: var(--colour-rust);
}

.lightbox__prev,
.lightbox__next {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--colour-page);
  font-size: var(--text-2xl);
  cursor: pointer;
  padding: var(--space-4);
  transition: color var(--transition-base);
  opacity: 0.6;
}

.lightbox__prev:hover,
.lightbox__prev:focus-visible,
.lightbox__next:hover,
.lightbox__next:focus-visible {
  opacity: 1;
  color: var(--colour-page);
}

.lightbox__prev { left: var(--space-4); }
.lightbox__next { right: var(--space-4); }

/* ── About Page ──────────────────────────────────────────────── */

.about-page {
  max-width: 680px;
  margin-inline: auto;
  padding: var(--space-16) 0;
}

.about-page__photo {
  margin-bottom: var(--space-8);
  aspect-ratio: 3 / 2;
  overflow: hidden;
}

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

.about-page__body {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  line-height: var(--line-height-normal);
  color: var(--colour-ink);
}

/* design.md: pull quote treatment */
.about-page__pull-quote {
  font-family: var(--font-accent);
  font-style: italic;
  font-size: var(--text-xl);
  color: var(--colour-ink-mid);
  border-left: 3px solid var(--colour-leather);
  padding-left: var(--space-6);
  margin: var(--space-12) 0;
  line-height: var(--line-height-tight);
}

.about-page__camera {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--colour-border);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--colour-ink-light);
  letter-spacing: 0.04em;
}

.about-page__back {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--colour-ink-light);
  margin-bottom: 0;
}

/* ── Trip Navigation (prev/next) ─────────────────────────────── */

.trip-nav {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: var(--space-8) 0;
  border-top: 1px solid var(--colour-border);
  margin-top: var(--space-16);
  gap: var(--space-4);
}

.trip-nav__link {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--colour-ink-mid);
  text-decoration: none;
  transition: color var(--transition-base);
}

.trip-nav__link:hover,
.trip-nav__link:focus-visible {
  color: var(--colour-leather);
  text-decoration: none;
}

.trip-nav__label {
  display: block;
  font-size: var(--text-xs);
  color: var(--colour-ink-light);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: var(--space-1);
}

.trip-nav__link--next {
  text-align: right;
}

/* ── Responsive ──────────────────────────────────────────────── */

/* sm — 640px: two-column gallery */
@media (min-width: 640px) {
  .photo-grid {
    columns: 2;
  }
}

/* md — 900px: alternating trip cards */
@media (min-width: 900px) {
  .trip-card {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
    align-items: start;
  }

  .trip-card__body {
    padding: 0;
  }

  /* Alternate: odd cards — image left, text right */
  .trip-card:nth-child(odd) .trip-card__image-wrap {
    order: 0;
  }
  .trip-card:nth-child(odd) .trip-card__body {
    order: 1;
  }

  /* Alternate: even cards — text left, image right */
  .trip-card:nth-child(even) .trip-card__image-wrap {
    order: 1;
  }
  .trip-card:nth-child(even) .trip-card__body {
    order: 0;
  }
}

/* lg — 1200px: full layout */
@media (min-width: 1200px) {
  :root {
    --container-gutter: var(--space-8);
  }

  .trip-card {
    grid-template-columns: 5fr 4fr;
  }

  .trip-card:nth-child(even) {
    grid-template-columns: 4fr 5fr;
  }

  .site-title {
    font-size: var(--text-2xl);
  }
}