body {
  margin: 0;
  padding: 0;
}

main {
  font-size: clamp(10px, 1.8vw, 18px);
  font-family: Helvetica, Arial, sans-serif;
  max-width: 1000px;
  width: 97%;
  margin: 10px auto;
  box-sizing: border-box;
}

/*-----------------------------------------------------------------*/
/* Header                                                          */
/*-----------------------------------------------------------------*/

.header {
  font-family: Helvetica, Arial, sans-serif;
  background: #ffffffb9;
  display: flex;
  justify-content: space-between;
  align-items: center;

  position: fixed;
  top: 0;
  left: 0;
  right: 0;

  margin: 0 auto;
  max-width: 1400px;
  width: 97%;

  z-index: 1000;
}

.header #name {
  margin: 20px 0;
  font-size: clamp(14px, 2.3vw, 20px);
}

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

#name a:visited {
  color: inherit;
}

.subpage {
  background: transparent;
  font-size: clamp(9px, 1.8vw, 18px);
  text-align: left;
  border: none;
  color: #6d6d6d;
}

.nav {
  display: flex;
  gap: clamp(1px, 2vw, 20px);
  align-items: center;
}

.nav .subpage {
  cursor: pointer;
  transition: transform 0.2s;
}

.nav .subpage:hover {
  transform: translateY(3px);
}

.header.hidden {
  transform: translateY(-120%);
}

.header.animate,
.header.animate.hidden {
  transition: transform 1s ease-in-out;
}

/*-----------------------------------------------------------------*/
/* Hero & Intro                                                     */
/*-----------------------------------------------------------------*/

.main-image {
  aspect-ratio: 5 / 2;
  background: #111 url('m4_hero_detail.jpg') no-repeat center center;
  background-size: cover;
  margin-bottom: 20px;
  margin-top: clamp(60px, 10vw, 100px);
}

.title {
  color: black;
  font-size: clamp(20px, 5vw, 50px);
  font-weight: bold;
}

.intro {
  margin: 50px 0 90px 0;
  font-size: clamp(12px, 2.1vw, 21px);
  color: #6d6d6d;
}

/*-----------------------------------------------------------------*/
/* Section Titles & Body Text                                      */
/*-----------------------------------------------------------------*/

.section-title {
  font-size: clamp(12px, 2.5vw, 25px);
  font-weight: bold;
  margin: 130px 0 20px 0;
  color: black;
}

.subsection-title {
  font-size: clamp(11px, 2vw, 20px);
  font-weight: bold;
  margin: 44px 0 14px 0;
  color: #222;
}

.text {
  font-size: clamp(10px, 1.6vw, 16px);
  line-height: 1.5;
  color: #636363;
  text-align: justify;
}

/*-----------------------------------------------------------------*/
/* Image Layouts                                                   */
/*-----------------------------------------------------------------*/

img {
  display: block;
  width: 100%;
  cursor: zoom-in;
}

.img-full {
  width: 100%;
  display: block;
  margin: 20px 0;
}

.img-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 20px 0;
}

.img-3col {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 12px;
  margin: 20px 0;
}

.img-4grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin: 20px 0;
}

.img-6grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 6px;
  margin: 20px 0;
}

.img-7grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 8px;
  margin: 12px 0;
}

.img-8grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin: 20px 0;
}

@media (max-width: 700px) {
  .img-2col { grid-template-columns: 1fr; }
  .img-3col { grid-template-columns: 1fr 1fr; }
  .img-4grid { grid-template-columns: 1fr 1fr; }
  .img-6grid { grid-template-columns: repeat(3, 1fr); }
  .img-7grid { grid-template-columns: repeat(4, 1fr); }
  .img-8grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 420px) {
  .img-3col { grid-template-columns: 1fr; }
  .img-6grid { grid-template-columns: repeat(2, 1fr); }
  .img-7grid { grid-template-columns: repeat(4, 1fr); }
}

/*-----------------------------------------------------------------*/
/* Captions                                                        */
/*-----------------------------------------------------------------*/

.img-caption {
  font-size: clamp(8px, 1.2vw, 12px);
  color: #aaa;
  text-align: center;
  margin: 5px 0 0 0;
  font-family: Helvetica, Arial, sans-serif;
}

/*-----------------------------------------------------------------*/
/* Transformation Sequence                                         */
/*-----------------------------------------------------------------*/

.sequence-wrap {
  margin: 24px 0;
}

.sequence-wrap .img-6grid img {
  aspect-ratio: 3 / 4;
  object-fit: cover;
  object-position: center;
}

/*-----------------------------------------------------------------*/
/* Footer                                                          */
/*-----------------------------------------------------------------*/

.footer {
  font-family: Helvetica, Arial, sans-serif;
  font-size: clamp(9px, 1.4vw, 13px);
  color: #aaa;
  margin: 120px 0 60px 0;
  line-height: 2;
}

/*-----------------------------------------------------------------*/
/* Hero Split Layout (2/3 + 1/3)                                   */
/*-----------------------------------------------------------------*/

.hero-split-layout {
  display: grid;
  grid-template-columns: 5fr 2fr;
  gap: 8px;
  margin: 20px 0;
  align-items: start;
}

.hero-side-stack {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.hero-side-stack > img {
  width: 100%;
  aspect-ratio: 20 / 29;
  object-fit: cover;
}

@media (max-width: 600px) {
  .hero-split-layout {
    grid-template-columns: 1fr;
  }

  .hero-side-stack {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    flex-direction: unset;
  }
}

/*-----------------------------------------------------------------*/
/* M3 Side Stack — contain                                         */
/*-----------------------------------------------------------------*/

.m3-side-stack .img-rotated-90 {
  object-fit: contain;
}

/*-----------------------------------------------------------------*/
/* Rotated Image Wrapper                                           */
/*-----------------------------------------------------------------*/

.rotate-wrap {
  overflow: hidden;
  width: 100%;
  aspect-ratio: 4 / 5;
}

.img-rotated-90 {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: rotate(90deg);
  cursor: zoom-in;
}

/*-----------------------------------------------------------------*/
/* M2 View Images — cover                                          */
/*-----------------------------------------------------------------*/

.m2-views img {
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/*-----------------------------------------------------------------*/
/* Seasonal Grid — cover                                           */
/*-----------------------------------------------------------------*/

.seasonal-grid img {
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/*-----------------------------------------------------------------*/
/* M4 Detail + Diagram — matched height                           */
/*-----------------------------------------------------------------*/

.m4-detail-diagram img {
  aspect-ratio: 2 / 3;
}

.m4-detail-diagram img:first-child {
  object-fit: cover;
}

.m4-detail-diagram img:last-child {
  object-fit: contain;
}

/*-----------------------------------------------------------------*/
/* Elevation Grid — matched height                                 */
/*-----------------------------------------------------------------*/

.elevation-grid img {
  aspect-ratio: 3 / 4;
  object-fit: cover;
  background: #f5f5f5;
}

/*-----------------------------------------------------------------*/
/* Image Hover (clickable indication)                              */
/*-----------------------------------------------------------------*/

main img:not(.no-lightbox) {
  transition: filter 0.2s;
}

main img:not(.no-lightbox):hover {
  filter: brightness(0.85);
}

/*-----------------------------------------------------------------*/
/* Lightbox                                                        */
/*-----------------------------------------------------------------*/

#lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.88);
  z-index: 9999;
  align-items: center;
  justify-content: center;
  cursor: zoom-out;
}

#lightbox.active {
  display: flex;
}

#lightbox-img {
  max-width: 92vw;
  max-height: 92vh;
  width: auto;
  object-fit: contain;
  cursor: default;
}