/* ===========================
   ROGER PUTA RAILROAD COLLECTION
   Vintage railroad photography aesthetic:
   Deep charcoal, aged sepia, amber accents
   =========================== */

/* --- DESIGN TOKENS --- */
:root,
[data-theme='light'] {
  --color-bg: #f5f2ec;
  --color-surface: #faf8f4;
  --color-surface-2: #ffffff;
  --color-surface-offset: #ede9e0;
  --color-surface-offset-2: #e4dfd4;
  --color-divider: #d5cfc4;
  --color-border: #c8c2b5;

  --color-text: #231f17;
  --color-text-muted: #6e6860;
  --color-text-faint: #b0a898;
  --color-text-inverse: #faf8f4;

  /* Amber/sepia railroad accent */
  --color-primary: #8c4a00;
  --color-primary-hover: #6e3900;
  --color-primary-active: #532b00;
  --color-primary-highlight: #f0dfc5;

  --color-gold: #c27d00;
  --color-rail: #4a4035;

  --shadow-sm: 0 1px 3px rgba(35,31,23,0.08);
  --shadow-md: 0 4px 14px rgba(35,31,23,0.10);
  --shadow-lg: 0 12px 36px rgba(35,31,23,0.14);

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  --transition: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-hero: clamp(2.75rem,  0.5rem  + 6vw,    6rem);

  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'Source Sans 3', 'Helvetica Neue', sans-serif;

  --content-default: 1160px;
  --content-narrow: 720px;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
}

[data-theme='dark'] {
  --color-bg: #18150f;
  --color-surface: #1f1b14;
  --color-surface-2: #252017;
  --color-surface-offset: #1b1810;
  --color-surface-offset-2: #221e16;
  --color-divider: #2d2820;
  --color-border: #3d3828;

  --color-text: #e8e2d6;
  --color-text-muted: #9a9080;
  --color-text-faint: #5a5448;
  --color-text-inverse: #18150f;

  --color-primary: #d4820a;
  --color-primary-hover: #e8920d;
  --color-primary-active: #f5a52a;
  --color-primary-highlight: #3d2e12;

  --color-gold: #e8a820;
  --color-rail: #d4c9b4;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.25);
  --shadow-md: 0 4px 14px rgba(0,0,0,0.35);
  --shadow-lg: 0 12px 36px rgba(0,0,0,0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #18150f;
    --color-surface: #1f1b14;
    --color-surface-2: #252017;
    --color-surface-offset: #1b1810;
    --color-surface-offset-2: #221e16;
    --color-divider: #2d2820;
    --color-border: #3d3828;
    --color-text: #e8e2d6;
    --color-text-muted: #9a9080;
    --color-text-faint: #5a5448;
    --color-text-inverse: #18150f;
    --color-primary: #d4820a;
    --color-primary-hover: #e8920d;
    --color-primary-active: #f5a52a;
    --color-primary-highlight: #3d2e12;
    --color-gold: #e8a820;
    --color-rail: #d4c9b4;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.25);
    --shadow-md: 0 4px 14px rgba(0,0,0,0.35);
    --shadow-lg: 0 12px 36px rgba(0,0,0,0.5);
  }
}

/* --- BASE --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  scroll-padding-top: 5rem;
}
body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg);
}
img, picture { display: block; max-width: 100%; height: auto; }
h1,h2,h3,h4,h5,h6 { text-wrap: balance; line-height: 1.15; }
p, li, figcaption { text-wrap: pretty; max-width: 72ch; }
button { cursor: pointer; background: none; border: none; font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
::selection { background: color-mix(in oklab, var(--color-primary), transparent 78%); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* --- PASSWORD GATE --- */
.pw-gate {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
  padding: var(--space-6);
}
.pw-gate.hidden {
  display: none;
}
.pw-card {
  width: 100%;
  max-width: 420px;
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-xl);
  padding: var(--space-10) var(--space-8);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  text-align: center;
}
.pw-logo {
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}
.pw-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--color-text);
}
.pw-sub {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
  max-width: none;
}
.pw-form {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-2);
}
.pw-input-wrap {
  position: relative;
}
.pw-input {
  width: 100%;
  padding: var(--space-4) var(--space-12) var(--space-4) var(--space-4);
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  text-align: left;
}
.pw-input::placeholder { color: var(--color-text-faint); }
.pw-input:focus { border-color: var(--color-primary); box-shadow: 0 0 0 3px color-mix(in oklab, var(--color-primary), transparent 82%); }
.pw-input.error { border-color: #c0392b; }
.pw-reveal {
  position: absolute;
  right: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-faint);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: color var(--transition);
}
.pw-reveal:hover { color: var(--color-text); }
.pw-error {
  font-size: var(--text-sm);
  color: #c0392b;
  min-height: 1.4em;
  text-align: left;
}
.pw-submit {
  width: 100%;
  padding: var(--space-4);
  background: var(--color-primary);
  color: #fff;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}
.pw-submit:hover { background: var(--color-primary-hover); transform: translateY(-1px); }
.pw-hint {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-style: italic;
  max-width: none;
}

/* --- FOOTER CREDIT --- */
.footer-credit {
  font-weight: 600;
  color: var(--color-text-muted) !important;
  letter-spacing: 0.02em;
}

/* --- HEADER --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in oklab, var(--color-surface) 95%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
}
.header-inner {
  max-width: var(--content-default);
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text);
  transition: opacity var(--transition);
}
.logo:hover { opacity: 0.75; }
.logo-text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.site-nav a {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: color var(--transition);
}
.site-nav a:hover { color: var(--color-primary); }
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full, 9999px);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  transition: color var(--transition), border-color var(--transition);
}
.theme-toggle:hover { color: var(--color-primary); border-color: var(--color-primary); }

/* --- HERO --- */
.hero {
  position: relative;
  height: clamp(480px, 70vh, 820px);
  overflow: hidden;
  display: flex;
  align-items: flex-end;
}
.hero-bg {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
}
.hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: sepia(30%) contrast(1.05);
  transition: transform 8s ease;
}
.hero:hover .hero-img { transform: scale(1.03); }
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    color-mix(in oklab, var(--color-bg) 92%, transparent) 0%,
    color-mix(in oklab, var(--color-bg) 50%, transparent) 40%,
    color-mix(in oklab, var(--color-bg) 10%, transparent) 70%,
    transparent 100%
  );
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: var(--content-default);
  margin: 0 auto;
  width: 100%;
  padding: var(--space-16) var(--space-6);
}
.hero-eyebrow {
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
  max-width: none;
}
.hero-title {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 900;
  color: var(--color-text);
  line-height: 1.0;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-5);
  max-width: none;
}
.hero-sub {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 54ch;
  margin-bottom: var(--space-8);
  font-weight: 300;
  line-height: 1.6;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-8);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  transition: background var(--transition), transform var(--transition);
}
.btn-primary:hover { background: var(--color-primary-hover); transform: translateY(-1px); }
.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  background: transparent;
  color: var(--color-text);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition), color var(--transition);
}
.btn-ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }

/* --- SEARCH SECTION --- */
.search-section {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-divider);
  padding: var(--space-12) var(--space-6);
}
.search-inner {
  max-width: var(--content-default);
  margin: 0 auto;
}
.search-heading {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-6);
  letter-spacing: -0.01em;
}
.search-wrap {
  position: relative;
  max-width: 680px;
  margin-bottom: var(--space-6);
}
.search-icon {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-faint);
  pointer-events: none;
}
.search-input {
  width: 100%;
  padding: var(--space-4) var(--space-12) var(--space-4) var(--space-10);
  background: var(--color-surface-2);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.search-input::placeholder { color: var(--color-text-faint); }
.search-input:focus { border-color: var(--color-primary); box-shadow: 0 0 0 3px color-mix(in oklab, var(--color-primary), transparent 82%); }
.search-clear {
  position: absolute;
  right: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-faint);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full, 9999px);
  transition: color var(--transition), background var(--transition);
}
.search-clear:hover { color: var(--color-text); background: var(--color-surface-offset); }
.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}
.chip {
  padding: var(--space-2) var(--space-4);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-full, 9999px);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  background: transparent;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}
.chip:hover { border-color: var(--color-primary); color: var(--color-primary); }
.chip.active { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }
.results-count {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  font-style: italic;
  min-height: 1.4em;
}

/* --- GALLERY GRID --- */
.gallery-section {
  padding: var(--space-12) var(--space-6) var(--space-16);
  max-width: var(--content-default);
  margin: 0 auto;
}
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-8);
}

/* CARD */
.album-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-xl);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}
.album-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
  border-color: var(--color-border);
}
.album-card[style*="display: none"] { display: none !important; }

.card-image-link { display: block; }
.card-image-wrap {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--color-surface-offset);
}
.card-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: sepia(15%) contrast(1.02);
  transition: transform 0.5s ease, filter 0.5s ease;
}
.album-card:hover .card-image { transform: scale(1.05); filter: sepia(0%) contrast(1.05); }
.card-count-badge {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  background: color-mix(in oklab, var(--color-bg) 75%, transparent);
  backdrop-filter: blur(8px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full, 9999px);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: var(--space-1) var(--space-3);
  color: var(--color-text-muted);
}
.card-body {
  padding: var(--space-5) var(--space-6) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  flex: 1;
}
.card-railroad-tag {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.card-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.2;
  margin-bottom: var(--space-1);
}
.card-caption {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
  flex: 1;
}
.card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-divider);
  margin-top: auto;
}
.card-loco {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-style: italic;
  letter-spacing: 0.02em;
}
.card-link {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-primary);
  transition: color var(--transition);
  white-space: nowrap;
}
.card-link:hover { color: var(--color-primary-hover); }

/* NO RESULTS */
.no-results {
  text-align: center;
  padding: var(--space-20) var(--space-6);
  color: var(--color-text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}
.no-results p { max-width: none; font-size: var(--text-lg); }

/* --- MORE ALBUMS --- */
.more-albums-section {
  background: var(--color-surface-offset);
  border-top: 1px solid var(--color-divider);
  padding: clamp(var(--space-12), 6vw, var(--space-20)) var(--space-6);
}
.more-inner { max-width: var(--content-default); margin: 0 auto; }
.section-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
  letter-spacing: -0.01em;
}
.section-sub {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
}
.more-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-3);
}
.more-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition), color var(--transition);
}
.more-card:hover { border-color: var(--color-primary); box-shadow: var(--shadow-md); color: var(--color-primary); }
.more-card-title { font-size: var(--text-sm); font-weight: 600; line-height: 1.4; }
.more-card-arrow { font-size: var(--text-base); flex-shrink: 0; color: var(--color-primary); transition: transform var(--transition); }
.more-card:hover .more-card-arrow { transform: translateX(3px); }

/* --- ABOUT --- */
.about-section {
  padding: clamp(var(--space-12), 6vw, var(--space-20)) var(--space-6);
  border-top: 1px solid var(--color-divider);
}
.about-inner {
  max-width: var(--content-default);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: var(--space-16);
  align-items: start;
}
.about-portrait { position: sticky; top: 5.5rem; }
.about-img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  filter: sepia(20%) contrast(1.05);
}
.about-img-caption {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-style: italic;
  margin-top: var(--space-3);
  text-align: center;
  max-width: none;
}
.about-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
}
.about-text p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.75;
  margin-bottom: var(--space-5);
}
.about-text strong { color: var(--color-text); font-weight: 700; }
.about-links {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-top: var(--space-8);
  margin-bottom: var(--space-6);
}
.pd-notice {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background: var(--color-primary-highlight);
  border: 1px solid color-mix(in oklab, var(--color-primary), transparent 70%);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}
.pd-notice svg { flex-shrink: 0; margin-top: 2px; color: var(--color-primary); }
.pd-notice strong { color: var(--color-text); }

/* --- FOOTER --- */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  padding: var(--space-10) var(--space-6);
}
.footer-inner {
  max-width: var(--content-default);
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text-muted);
}
.footer-copy {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  max-width: 60ch;
}
.footer-copy a { color: var(--color-primary); text-decoration: underline; text-underline-offset: 3px; }
.footer-copy a:hover { color: var(--color-primary-hover); }

/* --- RESPONSIVE --- */
@media (max-width: 900px) {
  .about-inner { grid-template-columns: 1fr; }
  .about-portrait { position: static; }
  .about-img { aspect-ratio: 16/9; }
  .logo-text { display: none; }
}
@media (max-width: 640px) {
  .header-inner { padding: var(--space-3) var(--space-4); }
  .hero-content { padding: var(--space-10) var(--space-4); }
  .hero-sub { font-size: var(--text-base); }
  .gallery-grid { grid-template-columns: 1fr; }
  .search-section, .gallery-section, .about-section, .more-albums-section { padding-left: var(--space-4); padding-right: var(--space-4); }
  .site-nav a { display: none; }
}