/* ============================================
   KINTSUKUROI — Photography Portfolio
   Dark-first, cinematic, image-forward
   ============================================ */

/* ---- DESIGN TOKENS ---- */
:root {
  --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-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    8rem);

  --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;
  --space-32: 8rem;

  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.75rem;

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

  --font-display: 'Cormorant Garamond', 'Georgia', serif;
  --font-body:    'Switzer', 'Helvetica Neue', sans-serif;

  --content-default: 1200px;
}

/* ---- DARK THEME (default) ---- */
:root, [data-theme="dark"] {
  --color-bg:              #0d0c0b;
  --color-surface:         #131210;
  --color-surface-2:       #1a1917;
  --color-surface-offset:  #222120;
  --color-border:          #2c2b29;
  --color-divider:         #242321;

  --color-text:            #e8e6e1;
  --color-text-muted:      #8a8882;
  --color-text-faint:      #4a4947;
  --color-text-inverse:    #0d0c0b;

  /* Gold accent — kintsugi gold */
  --color-primary:         #b89a5a;
  --color-primary-hover:   #d4b878;
  --color-primary-active:  #e8cf9a;
  --color-primary-dim:     rgba(184, 154, 90, 0.12);

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.7);
}

/* ---- LIGHT THEME ---- */
[data-theme="light"] {
  --color-bg:              #f5f3ef;
  --color-surface:         #f8f7f3;
  --color-surface-2:       #ffffff;
  --color-surface-offset:  #eeece8;
  --color-border:          #dbd9d4;
  --color-divider:         #e5e3df;

  --color-text:            #1a1917;
  --color-text-muted:      #6b6964;
  --color-text-faint:      #b0aea9;
  --color-text-inverse:    #f5f3ef;

  --color-primary:         #8a6e30;
  --color-primary-hover:   #6b5220;
  --color-primary-active:  #4e3a12;
  --color-primary-dim:     rgba(138, 110, 48, 0.10);

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
}

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

html {
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-16);
}

body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color 0.3s ease, color 0.3s ease;
}

img, picture, video, canvas { display: block; max-width: 100%; height: auto; }
ul[role="list"] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4 { text-wrap: balance; line-height: 1.1; }
p, li { text-wrap: pretty; }

::selection {
  background: var(--color-primary-dim);
  color: var(--color-primary-hover);
}

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

button { cursor: pointer; background: none; border: none; }

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-interactive);
}

@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;
  }
}

/* ---- HEADER ---- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  transition: background 0.4s ease, box-shadow 0.3s ease, transform 0.3s var(--ease-out);
}

.header--scrolled {
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--color-border);
}

.header--hidden {
  transform: translateY(-100%);
}

.nav-inner {
  max-width: var(--content-default);
  margin: 0 auto;
  padding: var(--space-5) var(--space-8);
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.logo {
  color: var(--color-text);
  flex-shrink: 0;
  transition: opacity var(--transition-interactive);
}
.logo:hover { opacity: 0.7; }

.nav-links {
  display: flex;
  gap: var(--space-8);
  margin-left: auto;
}

.nav-link {
  font-size: var(--text-sm);
  font-family: var(--font-body);
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  transition: color var(--transition-interactive);
}
.nav-link:hover { color: var(--color-text); }

.theme-toggle {
  color: var(--color-text-muted);
  padding: var(--space-2);
  display: flex;
  align-items: center;
  transition: color var(--transition-interactive);
  margin-left: var(--space-4);
}
.theme-toggle:hover { color: var(--color-primary); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  margin-left: var(--space-2);
}
.hamburger span {
  display: block;
  width: 22px;
  height: 1px;
  background: var(--color-text);
  transition: transform 0.25s var(--ease-out), opacity 0.25s ease;
}
.hamburger.open span:first-child { transform: translateY(6px) rotate(45deg); }
.hamburger.open span:last-child  { transform: translateY(-6px) rotate(-45deg); }

.mobile-nav {
  display: none;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4) var(--space-8) var(--space-6);
  background: color-mix(in srgb, var(--color-bg) 95%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--color-border);
}
.mobile-nav.open { display: flex; }

.mobile-nav-link {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition-interactive);
}
.mobile-nav-link:last-child { border-bottom: none; }
.mobile-nav-link:hover { color: var(--color-text); }

/* ---- HERO ---- */
.hero {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-32) var(--space-8) var(--space-20);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 40%, color-mix(in srgb, var(--color-primary) 6%, transparent), transparent 70%);
  pointer-events: none;
}

.hero-label {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-6);
}

.hero-title {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 300;
  line-height: 1.0;
  color: var(--color-text);
  margin-bottom: var(--space-8);
}

.hero-title em {
  font-style: italic;
  color: var(--color-primary);
}

.hero-title span {
  font-style: normal;
  font-weight: 300;
  font-size: clamp(1.5rem, 1rem + 3vw, 3.5rem);
  color: var(--color-text-muted);
  display: block;
  letter-spacing: 0.04em;
  margin-top: var(--space-2);
}

.hero-sub {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 42ch;
  margin: 0 auto var(--space-10);
  font-style: italic;
  font-family: var(--font-display);
  font-size: var(--text-lg);
}

.hero-cta {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  padding: var(--space-4) var(--space-8);
  transition: border-color var(--transition-interactive), color var(--transition-interactive), background var(--transition-interactive);
}
.hero-cta:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.hero-scroll-hint {
  position: absolute;
  bottom: var(--space-10);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text-faint);
}

.hero-scroll-hint span {
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--color-text-faint), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.4; transform: scaleY(1); }
  50%       { opacity: 1;   transform: scaleY(1.2); }
}

/* ---- FADE IN ANIMATION ---- */
.fade-in {
  opacity: 1;
}

@supports (animation-timeline: scroll()) {
  /* hero items use a simple JS-driven fade instead */
}

/* JS-driven entrance for hero */
.fade-in[data-animate] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}
.fade-in[data-animate].visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---- GALLERY ---- */
.gallery-section {
  padding: clamp(var(--space-16), 8vw, var(--space-32)) var(--space-6);
  max-width: var(--content-default);
  margin: 0 auto;
}

.gallery-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 300;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.section-sub {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  letter-spacing: 0.06em;
}

/* Masonry — CSS columns */
.masonry-grid {
  columns: 3;
  column-gap: var(--space-3);
}

.photo-item {
  break-inside: avoid;
  margin-bottom: var(--space-3);
  cursor: zoom-in;
  position: relative;
  overflow: hidden;
}

.photo-wrap {
  position: relative;
  overflow: hidden;
  background: var(--color-surface);
}

.photo-wrap img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1), filter 0.4s ease;
  filter: brightness(0.92);
}

.photo-item:hover .photo-wrap img {
  transform: scale(1.03);
  filter: brightness(1);
}

.photo-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.75) 0%, rgba(0,0,0,0.15) 40%, transparent 70%);
  display: flex;
  align-items: flex-end;
  padding: var(--space-4) var(--space-5);
  opacity: 0;
  transition: opacity 0.35s var(--ease-out);
}

.photo-item:hover .photo-overlay,
.photo-item:focus-visible .photo-overlay {
  opacity: 1;
}

.photo-title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-style: italic;
  color: #fff;
  font-weight: 300;
}

/* Chapter labels */
.chapter-label {
  text-align: center;
  margin: clamp(var(--space-12), 6vw, var(--space-20)) auto var(--space-8);
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-6);
  max-width: var(--content-default);
  padding: 0 var(--space-6);
}

.chapter-label::before,
.chapter-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.chapter-label span {
  font-family: var(--font-display);
  font-style: italic;
  font-size: var(--text-sm);
  font-weight: 300;
  color: var(--color-primary);
  letter-spacing: 0.12em;
  white-space: nowrap;
  flex-shrink: 0;
}

/* Gallery scroll reveal */
.photo-item {
  opacity: 1;
}

@supports (animation-timeline: scroll()) {
  .photo-item {
    animation: fadeReveal linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 60%;
  }

  @keyframes fadeReveal {
    from { opacity: 0; }
    to   { opacity: 1; }
  }
}

/* ---- ABOUT ---- */
.about-section {
  padding: clamp(var(--space-16), 8vw, var(--space-32)) var(--space-6);
  border-top: 1px solid var(--color-border);
}

.about-inner {
  max-width: var(--content-default);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.about-text .section-title {
  margin-bottom: var(--space-6);
}

.about-body {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 300;
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
  max-width: 54ch;
}

.about-body em {
  font-style: italic;
  color: var(--color-primary);
}

.about-link {
  display: inline-block;
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-top: var(--space-4);
  transition: color var(--transition-interactive), letter-spacing var(--transition-interactive);
}
.about-link:hover {
  color: var(--color-primary-hover);
  letter-spacing: 0.15em;
}

.about-image-wrap {
  position: relative;
  overflow: hidden;
}

.about-img {
  width: 100%;
  height: clamp(300px, 50vw, 560px);
  object-fit: cover;
  display: block;
  filter: grayscale(20%);
  transition: filter 0.5s ease;
}
.about-image-wrap:hover .about-img {
  filter: grayscale(0%);
}

/* ---- CONTACT ---- */
.contact-section {
  padding: clamp(var(--space-16), 8vw, var(--space-32)) var(--space-6);
  text-align: center;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.contact-inner {
  max-width: 600px;
  margin: 0 auto;
}

.contact-sub {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 300;
  font-style: italic;
  color: var(--color-text-muted);
  margin: var(--space-4) 0 var(--space-10);
}

.contact-email {
  display: inline-block;
  font-size: var(--text-base);
  font-family: var(--font-body);
  color: var(--color-primary);
  letter-spacing: 0.04em;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
  transition: color var(--transition-interactive), opacity var(--transition-interactive);
}
.contact-email:hover {
  color: var(--color-primary-hover);
  opacity: 0.85;
}

/* ---- FOOTER ---- */
.footer {
  padding: var(--space-8) var(--space-8);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.footer-text {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.04em;
}

/* ---- LIGHTBOX ---- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s var(--ease-out);
}

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

.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(5, 5, 4, 0.95);
  cursor: zoom-out;
}

.lightbox-container {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  padding: var(--space-16) var(--space-16);
  z-index: 1;
}

.lightbox-img-wrap {
  max-height: calc(100dvh - 120px);
  max-width: calc(100vw - 180px);
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(0.96);
  transition: transform 0.35s var(--ease-out);
}

.lightbox.open .lightbox-img-wrap {
  transform: scale(1);
}

.lightbox-img {
  max-height: calc(100dvh - 120px);
  max-width: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
  box-shadow: var(--shadow-lg);
}

.lightbox-close {
  position: absolute;
  top: var(--space-6);
  right: var(--space-6);
  color: rgba(255,255,255,0.7);
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  transition: color var(--transition-interactive), background var(--transition-interactive);
  z-index: 2;
}
.lightbox-close:hover { color: #fff; background: rgba(255,255,255,0.1); }

.lightbox-prev,
.lightbox-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  color: rgba(255,255,255,0.5);
  padding: var(--space-4);
  border-radius: var(--radius-sm);
  transition: color var(--transition-interactive), background var(--transition-interactive);
  z-index: 2;
}
.lightbox-prev { left: var(--space-4); }
.lightbox-next { right: var(--space-4); }
.lightbox-prev:hover,
.lightbox-next:hover { color: #fff; background: rgba(255,255,255,0.1); }

.lightbox-caption {
  position: absolute;
  bottom: var(--space-6);
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  padding: 0 var(--space-8);
}

.lightbox-title-text {
  font-family: var(--font-display);
  font-style: italic;
  font-size: var(--text-base);
  color: rgba(255,255,255,0.75);
  font-weight: 300;
}

.lightbox-counter-text {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.35);
  letter-spacing: 0.1em;
}

/* ---- RESPONSIVE ---- */

/* Tablet */
@media (max-width: 900px) {
  .masonry-grid { columns: 2; }

  .about-inner {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }

  .about-image-wrap { order: -1; }

  .nav-links, .theme-toggle { display: none; }
  .hamburger { display: flex; }

  .lightbox-container {
    padding: var(--space-16) var(--space-8);
  }
  .lightbox-img-wrap {
    max-width: calc(100vw - 100px);
  }
}

/* Mobile */
@media (max-width: 560px) {
  .masonry-grid { columns: 1; }

  .nav-inner {
    padding: var(--space-4) var(--space-5);
  }

  .hero {
    padding: var(--space-24) var(--space-5) var(--space-16);
    min-height: 100dvh;
  }

  .hero-scroll-hint { display: none; }

  .gallery-section,
  .about-section,
  .contact-section {
    padding: var(--space-12) var(--space-5);
  }

  .footer {
    flex-direction: column;
    text-align: center;
    padding: var(--space-6) var(--space-5);
  }

  .lightbox-container {
    padding: var(--space-12) var(--space-4);
  }
  .lightbox-img-wrap {
    max-width: 100vw;
    max-height: calc(100dvh - 100px);
  }
  .lightbox-prev { left: var(--space-2); }
  .lightbox-next { right: var(--space-2); }
}

/* System dark mode fallback */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:              #0d0c0b;
    --color-surface:         #131210;
    --color-surface-2:       #1a1917;
    --color-surface-offset:  #222120;
    --color-border:          #2c2b29;
    --color-divider:         #242321;
    --color-text:            #e8e6e1;
    --color-text-muted:      #8a8882;
    --color-text-faint:      #4a4947;
    --color-text-inverse:    #0d0c0b;
    --color-primary:         #b89a5a;
    --color-primary-hover:   #d4b878;
    --color-primary-active:  #e8cf9a;
    --color-primary-dim:     rgba(184, 154, 90, 0.12);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.5);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.7);
  }
}