/* ===========================
   PAUL FRITZ — PORTFOLIO CSS
   =========================== */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;1,9..40,300&display=swap');

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

:root {
  --sidebar-width: 25%;
  --img-height: 50vh;
  --see-also-height: 30vh;
  --font: 'DM Sans', system-ui, sans-serif;
  --color-bg: #ffffff;
  --color-text: #111111;
  --color-muted: #888888;
  --transition-speed: 0.35s;
  --transition-ease: cubic-bezier(0.4, 0, 0.2, 1);
}

html, body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font);
  font-weight: 300;
  font-size: clamp(13px, 1.1vw, 15px);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  /* No horizontal scroll */
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ===========================
   SIDEBAR
   =========================== */

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  padding: 2rem 1.5rem 2rem 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  z-index: 100;
  overflow: hidden;
}

.sidebar-top {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.sidebar-name {
  font-size: clamp(14px, 1.2vw, 16px);
  font-weight: 400;
  letter-spacing: 0.02em;
  cursor: pointer;
}

.sidebar-name:hover {
  color: var(--color-muted);
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.sidebar-nav a {
  font-size: clamp(12px, 1vw, 14px);
  color: var(--color-muted);
  transition: color var(--transition-speed) var(--transition-ease);
  cursor: pointer;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
  color: var(--color-text);
}

.project-list {
  display: none;
  flex-direction: column;
  gap: 0.2rem;
  margin-top: 1rem;
  overflow-y: auto;
  max-height: calc(100vh - 12rem);
  padding-right: 0.5rem;
}

.project-list.visible {
  display: flex;
}

.project-list-item {
  font-size: clamp(11px, 0.9vw, 13px);
  color: var(--color-muted);
  cursor: pointer;
  transition: color var(--transition-speed) var(--transition-ease);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: block;
}

.project-list-item:hover {
  color: var(--color-text);
}

.sidebar-bottom a {
  font-size: clamp(12px, 1vw, 14px);
  color: var(--color-muted);
  transition: color var(--transition-speed) var(--transition-ease);
}

.sidebar-bottom a:hover {
  color: var(--color-text);
}

/* ===========================
   MAIN CONTENT
   =========================== */

.main {
  margin-left: var(--sidebar-width);
  padding-left: 2rem;
  padding-top: 2rem;
  padding-bottom: 6rem;
  min-height: 100vh;
  /* Prevent horizontal overflow from images */
  overflow-x: hidden;
}

/* ===========================
   PROJECT BLOCK (flux)
   =========================== */

.project-block {
  margin-bottom: 4rem;
}

.project-title {
  font-size: clamp(12px, 1vw, 14px);
  font-weight: 400;
  color: var(--color-muted);
  margin-bottom: 0.75rem;
  cursor: pointer;
  transition: color var(--transition-speed) var(--transition-ease);
  display: inline-block;
}

.project-title:hover {
  color: var(--color-text);
}

/* ===========================
   CAROUSEL
   =========================== */

.carousel {
  position: relative;
}

.carousel-track-wrapper {
  overflow: hidden;
  /* height is set inline via JS */
}

.carousel-track {
  display: block; /* single item visible at a time via JS show/hide */
}

/* Carousel items: only first visible by default, rest hidden */
.carousel-item {
  display: none;
  position: relative;
}

.carousel-item:first-child {
  display: block;
}

/* All images in carousel: fixed height, width auto — no exceptions */
.carousel-item img {
  display: block;
  height: 50vh;
  width: auto;
  max-width: none;
  transition: opacity 0.3s ease;
}

/* Placeholder */
.img-placeholder {
  display: block;
  background: #f0f0f0;
  position: relative;
}

.img-placeholder::after {
  content: attr(data-name);
  position: absolute;
  bottom: 0.5rem;
  left: 0.5rem;
  font-size: 11px;
  color: #aaa;
}

/* Caption */
.carousel-caption {
  margin-top: 0.4rem;
  font-size: clamp(11px, 0.85vw, 12px);
  color: var(--color-muted);
  transition: opacity 0.25s ease;
}

.carousel-caption em {
  font-style: italic;
  font-weight: 300;
}

/* Arrow buttons */
.carousel-btn {
  position: absolute;
  top: 25vh; /* half of 50vh fixed carousel height */
  transform: translateY(-50%);
  background: var(--color-bg);
  border: none;
  cursor: pointer;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.2s ease;
  z-index: 10;
  color: var(--color-text);
  font-size: 1rem;
  line-height: 1;
}

.carousel:hover .carousel-btn {
  opacity: 1;
}

.carousel-btn:disabled {
  opacity: 0 !important;
  pointer-events: none;
}

/* prev: centered in the left margin (between sidebar and image left edge) */
/* margin is 2rem padding, arrow is 2rem wide, so -3rem centers it in the gap */
.carousel-btn.prev {
  left: -3rem;
  transform: translateX(50%) translateY(-50%);
}

/* next: positioned by JS at right edge of image */
.carousel-btn.next {
  transform: translateX(-50%) translateY(-50%);
}

/* ===========================
   PROJECT PAGE
   =========================== */

.project-page-header {
  margin-bottom: 2rem;
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
}

.back-btn {
  font-size: clamp(12px, 1vw, 14px);
  color: var(--color-muted);
  cursor: pointer;
  transition: color var(--transition-speed) var(--transition-ease);
  flex-shrink: 0;
}

.back-btn:hover {
  color: var(--color-text);
}

.project-page-title {
  font-size: clamp(13px, 1.1vw, 15px);
  font-weight: 400;
}

/* Project image flux — vertical layout */
.project-flux {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.project-flux-item {
  position: relative;
  display: inline-block;
  cursor: zoom-in;
}

/* Horizontal images: fixed height */
.project-flux-item img {
  display: block;
  height: var(--img-height);
  width: auto;
  transition: opacity 0.3s ease;
}

/* Vertical images in project page: golden ratio width */
/* Width = img-height / PHI = 50vh / 1.618 ≈ 30.9vh */
.project-flux-item.is-vertical img {
  height: auto;
  width: calc(var(--img-height) / 1.618);
}

.project-flux-item .flux-caption {
  margin-top: 0.4rem;
  font-size: clamp(11px, 0.85vw, 12px);
  color: var(--color-muted);
}

.project-flux-item .flux-caption em {
  font-style: italic;
}

/* ===========================
   SEE ALSO
   =========================== */

.see-also-section {
  margin-top: 5rem;
  padding-left: 4rem;
}

.see-also-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  color: var(--color-muted);
  font-size: clamp(11px, 0.85vw, 12px);
}

.see-also-project-name {
  font-size: clamp(12px, 1vw, 14px);
  color: var(--color-muted);
  margin-bottom: 0.5rem;
  cursor: pointer;
  transition: color var(--transition-speed) var(--transition-ease);
}

.see-also-project-name:hover {
  color: var(--color-text);
}

/* See also carousel arrows at correct height */
.see-also-section .carousel-btn {
  top: 7.5vh; /* half of 15vh */
}

.see-also-section .carousel-item img {
  height: 15vh;
}

.lightbox-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 1000;
  cursor: zoom-out;
  align-items: center;
  justify-content: center;
}

.lightbox-overlay.active {
  display: flex;
}

.lightbox-bg {
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0);
  transition: background 0.35s ease;
}

.lightbox-overlay.active .lightbox-bg {
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(8px);
}

.lightbox-img-wrap {
  position: relative;
  z-index: 1;
  transform: scale(0.95);
  opacity: 0;
  transition: transform 0.35s var(--transition-ease), opacity 0.35s ease;
}

.lightbox-overlay.active .lightbox-img-wrap {
  transform: scale(1);
  opacity: 1;
}

.lightbox-img-wrap img {
  max-width: 90vw;
  max-height: 90vh;
  display: block;
  object-fit: contain;
}

/* ===========================
   ABOUT PAGE
   =========================== */

.about-content {
  max-width: 480px;
  padding-top: 1rem;
}

.about-content p {
  margin-bottom: 1rem;
  line-height: 1.7;
}

/* ===========================
   RESPONSIVE — MOBILE
   =========================== */

@media (max-width: 768px) {
  :root {
    --sidebar-width: 0px;
    --img-height: auto;
  }

  .sidebar {
    position: relative;
    width: 100%;
    height: auto;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.2rem;
    border-bottom: 1px solid #eee;
  }

  .sidebar-top {
    flex-direction: row;
    align-items: center;
    gap: 1.2rem;
  }

  .sidebar-bottom {
    display: none;
  }

  .project-list {
    position: fixed;
    top: 3rem;
    left: 0;
    right: 0;
    background: var(--color-bg);
    padding: 1rem 1.2rem;
    border-bottom: 1px solid #eee;
    z-index: 200;
    max-height: 60vh;
    overflow-y: auto;
  }

  .main {
    margin-left: 0;
    padding-left: 1.2rem;
    padding-right: 1.2rem;
    padding-top: 1.5rem;
  }

  /* Mobile carousel: full width, auto height */
  .carousel-track-wrapper {
    height: auto !important;
  }

  .carousel-item img {
    height: auto !important;
    width: 100% !important;
    max-width: 100%;
  }

  .img-placeholder {
    width: 100% !important;
    height: auto !important;
    aspect-ratio: 4/3;
  }

  /* Mobile project flux */
  .project-flux-item img,
  .project-flux-item.is-vertical img {
    height: auto !important;
    width: 100% !important;
  }

  .see-also-section {
    padding-left: 0;
  }

  .carousel-btn {
    opacity: 1;
    top: 40%;
  }

  .carousel-btn.prev {
    left: -0.2rem;
  }
}