/* ==========================================
   HORIX Website - Main Stylesheet
   Black Background & White Text - Luxury Design
   ========================================== */

/* CSS Variables */
:root {
  --color-black: #000000;
  --color-white: #FFFFFF;
  --color-gray-light: #333333;
  --color-gray-medium: #666666;
  --color-gray-dark: #999999;
  --font-primary: 'Noto Sans JP', 'Yu Gothic', 'Hiragino Sans', sans-serif;
  --font-secondary: 'Helvetica Neue', Arial, sans-serif;
  --spacing-unit: 8px;
  --max-width: 1200px;
  --transition: all 0.3s ease;
}

/* Reset & Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  color: var(--color-white);
  background-color: var(--color-black);
  line-height: 1.8;
  font-weight: 400;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: calc(var(--spacing-unit) * 3);
  color: var(--color-white);
}

h1 {
  font-size: 3.5rem;
  letter-spacing: 0.5rem;
}

h2 {
  font-size: 2.5rem;
  letter-spacing: 0.3rem;
}

h3 {
  font-size: 1.8rem;
  letter-spacing: 0.1rem;
}

p {
  margin-bottom: calc(var(--spacing-unit) * 2);
  font-size: 1rem;
  line-height: 1.9;
  color: var(--color-white);
}

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

a:hover {
  opacity: 0.7;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ==========================================
   Header
   ========================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(0, 0, 0, 0.95);
  border-bottom: 1px solid var(--color-gray-light);
  z-index: 1000;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.header__container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: calc(var(--spacing-unit) * 3) calc(var(--spacing-unit) * 4);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header__logo {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.3rem;
  color: var(--color-white);
  text-decoration: none;
  transition: var(--transition);
}

.header__logo:hover {
  opacity: 0.7;
}

.header__nav {
  display: flex;
  gap: calc(var(--spacing-unit) * 4);
}

.header__nav-item {
  color: var(--color-white);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.1rem;
  padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2);
  transition: var(--transition);
  position: relative;
}

.header__nav-item::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 1px;
  background-color: var(--color-white);
  transition: var(--transition);
}

.header__nav-item:hover::after,
.header__nav-item.active::after {
  width: 80%;
}

.header__menu-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  padding: 10px;
}

.header__menu-toggle span {
  display: block;
  width: 25px;
  height: 2px;
  background-color: var(--color-white);
  transition: var(--transition);
}

/* Header for non-HOME pages */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(0, 0, 0, 0.95);
  border-bottom: 1px solid var(--color-gray-light);
  z-index: 1000;
  backdrop-filter: blur(10px);
}

header nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: calc(var(--spacing-unit) * 3) calc(var(--spacing-unit) * 4);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header .logo {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.3rem;
  color: var(--color-white);
}

header .nav-menu {
  display: flex;
  gap: calc(var(--spacing-unit) * 4);
  list-style: none;
}

header .nav-menu a {
  color: var(--color-white);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.1rem;
  padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2);
  transition: var(--transition);
  position: relative;
}

header .nav-menu a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 1px;
  background-color: var(--color-white);
  transition: var(--transition);
}

header .nav-menu a:hover::after,
header .nav-menu a.active::after {
  width: 80%;
}

header .hamburger {
  display: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  padding: 10px;
}

header .hamburger span {
  display: block;
  width: 25px;
  height: 2px;
  background-color: var(--color-white);
  transition: var(--transition);
}

/* ==========================================
   Hero Section
   ========================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background-color: var(--color-black);
  overflow: hidden;
}

.hero__background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
  filter: grayscale(100%);
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 900px;
  padding: calc(var(--spacing-unit) * 4);
}

.hero__logo {
  font-size: 4rem;
  font-weight: 700;
  letter-spacing: 1rem;
  margin-bottom: calc(var(--spacing-unit) * 4);
  color: var(--color-white);
}

.hero__title {
  font-size: 2.5rem;
  font-weight: 300;
  letter-spacing: 0.2rem;
  margin-bottom: calc(var(--spacing-unit) * 3);
  color: var(--color-white);
}

.hero__subtitle {
  font-size: 1.2rem;
  font-weight: 300;
  letter-spacing: 0.1rem;
  line-height: 2;
  color: var(--color-gray-dark);
}

/* Hero for other pages */
.page-hero {
  position: relative;
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background-color: var(--color-black);
  overflow: hidden;
  margin-top: 80px;
}

.page-hero__background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
  filter: grayscale(100%);
}

.page-hero__content {
  position: relative;
  z-index: 2;
  padding: calc(var(--spacing-unit) * 8) calc(var(--spacing-unit) * 4);
}

.page-hero__number {
  font-size: 1rem;
  letter-spacing: 0.3rem;
  margin-bottom: calc(var(--spacing-unit) * 2);
  color: var(--color-gray-medium);
  font-weight: 300;
}

.page-hero__title {
  font-size: 3.5rem;
  font-weight: 700;
  letter-spacing: 0.5rem;
  color: var(--color-white);
  margin-bottom: calc(var(--spacing-unit) * 3);
}

.page-hero__subtitle {
  font-size: 1.2rem;
  font-weight: 300;
  letter-spacing: 0.1rem;
  color: var(--color-gray-dark);
}

/* ==========================================
   Container & Section
   ========================================== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 calc(var(--spacing-unit) * 4);
}

.section {
  padding: calc(var(--spacing-unit) * 15) 0;
}

.section__header {
  text-align: center;
  margin-bottom: calc(var(--spacing-unit) * 10);
}

.section__number {
  font-size: 0.9rem;
  letter-spacing: 0.2rem;
  margin-bottom: calc(var(--spacing-unit) * 2);
  color: var(--color-gray-medium);
  font-weight: 400;
}

.section__title {
  font-size: 2.0rem;
  font-weight: 700;
  letter-spacing: 0.3rem;
  margin-bottom: calc(var(--spacing-unit) * 3);
  color: var(--color-white);
}

.section__subtitle {
  font-size: 1rem;
  color: var(--color-gray-dark);
  line-height: 1.8;
}

/* ==========================================
   Grid Layouts
   ========================================== */
.grid {
  display: grid;
  gap: calc(var(--spacing-unit) * 5);
}

.grid--2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid--4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ==========================================
   Cards
   ========================================== */
.card {
  background-color: var(--color-gray-light);
  border: 1px solid var(--color-gray-medium);
  transition: var(--transition);
  overflow: hidden;
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--color-white);
}

.card__image {
  width: 100%;
  height: 250px;
  object-fit: cover;
  filter: grayscale(100%);
  transition: var(--transition);
}

.card:hover .card__image {
  filter: grayscale(0%);
  opacity: 0.9;
}

.card__content {
  padding: calc(var(--spacing-unit) * 4);
}

.card__title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: calc(var(--spacing-unit) * 2);
  color: var(--color-white);
}

.card__text {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--color-gray-dark);
}

/* ==========================================
   Member Card
   ========================================== */
.member-card {
  background-color: var(--color-gray-light);
  border: 1px solid var(--color-gray-medium);
  overflow: hidden;
  transition: var(--transition);
}

.member-card:hover {
  transform: translateY(-5px);
  border-color: var(--color-white);
}

.member-card__image {
  width: 100%;
  height: 350px;
  object-fit: cover;
  filter: grayscale(100%);
  transition: var(--transition);
}

.member-card:hover .member-card__image {
  filter: grayscale(0%);
}

.member-card__content {
  padding: calc(var(--spacing-unit) * 4);
}

.member-card__position {
  font-size: 0.8rem;
  color: var(--color-gray-medium);
  margin-bottom: calc(var(--spacing-unit) * 1);
  letter-spacing: 0.1rem;
}

.member-card__name {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: calc(var(--spacing-unit) * 2);
  color: var(--color-white);
  letter-spacing: 0.1rem;
}

.member-card__works {
  font-size: 0.85rem;
  line-height: 1.8;
  color: var(--color-gray-dark);
}

/* ==========================================
   Work Item
   ========================================== */
.work-item {
  background-color: var(--color-gray-light);
  border: 1px solid var(--color-gray-medium);
  overflow: hidden;
  transition: var(--transition);
}

.work-item:hover {
  transform: translateY(-5px);
  border-color: var(--color-white);
}

.work-item__image {
  width: 100%;
  height: 250px;
  object-fit: cover;
  background-color: var(--color-gray-light);
  filter: grayscale(100%);
  transition: var(--transition);
}

.work-item:hover .work-item__image {
  filter: grayscale(0%);
}

.work-item__content {
  padding: calc(var(--spacing-unit) * 3);
}

.work-item__year {
  font-size: 0.8rem;
  color: var(--color-gray-medium);
  margin-bottom: calc(var(--spacing-unit) * 1);
}

.work-item__title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: calc(var(--spacing-unit) * 2);
  color: var(--color-white);
}

.work-item__description {
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--color-gray-dark);
  margin-bottom: calc(var(--spacing-unit) * 2);
}

.work-item__link {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--color-white);
  text-decoration: underline;
  transition: var(--transition);
}

.work-item__link:hover {
  opacity: 0.7;
}

/* ==========================================
   Form Styles
   ========================================== */
.form-group {
  margin-bottom: calc(var(--spacing-unit) * 4);
}

.form-label {
  display: block;
  margin-bottom: calc(var(--spacing-unit) * 1);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-white);
  letter-spacing: 0.05rem;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: calc(var(--spacing-unit) * 2);
  background-color: var(--color-gray-light);
  border: 1px solid var(--color-gray-medium);
  color: var(--color-white);
  font-family: var(--font-primary);
  font-size: 1rem;
  transition: var(--transition);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-white);
  background-color: #1a1a1a;
}

.form-textarea {
  min-height: 200px;
  resize: vertical;
}

.form-button {
  display: inline-block;
  padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 6);
  background-color: var(--color-white);
  color: var(--color-black);
  border: 2px solid var(--color-white);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.2rem;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.form-button:hover {
  background-color: var(--color-black);
  color: var(--color-white);
}

/* ==========================================
   Footer
   ========================================== */
.footer {
  background-color: var(--color-black);
  border-top: 1px solid var(--color-gray-light);
  padding: calc(var(--spacing-unit) * 10) 0 calc(var(--spacing-unit) * 5);
}

.footer__content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 calc(var(--spacing-unit) * 4);
  text-align: center;
}

.footer__logo {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.5rem;
  margin-bottom: calc(var(--spacing-unit) * 4);
  color: var(--color-white);
}

.footer__nav {
  display: flex;
  justify-content: center;
  gap: calc(var(--spacing-unit) * 4);
  margin-bottom: calc(var(--spacing-unit) * 6);
  flex-wrap: wrap;
}

.footer__nav-item {
  color: var(--color-gray-dark);
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer__nav-item:hover {
  color: var(--color-white);
}

.footer__info {
  margin-bottom: calc(var(--spacing-unit) * 4);
  font-size: 0.9rem;
  color: var(--color-gray-dark);
  line-height: 1.8;
}

.footer__copyright {
  font-size: 0.8rem;
  color: var(--color-gray-medium);
  letter-spacing: 0.05rem;
}

/* ==========================================
   Utility Classes
   ========================================== */
.text-center {
  text-align: center;
}

.mb-large {
  margin-bottom: calc(var(--spacing-unit) * 10);
}

.mb-medium {
  margin-bottom: calc(var(--spacing-unit) * 5);
}

.mb-small {
  margin-bottom: calc(var(--spacing-unit) * 3);
}

.mt-large {
  margin-top: calc(var(--spacing-unit) * 10);
}

/* ==========================================
   Responsive Design
   ========================================== */
@media (max-width: 768px) {
  /* Header */
  .header__nav {
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    background-color: rgba(0, 0, 0, 0.98);
    flex-direction: column;
    padding: calc(var(--spacing-unit) * 4);
    gap: calc(var(--spacing-unit) * 3);
    transform: translateX(-100%);
    transition: var(--transition);
  }

  .header__nav.active {
    transform: translateX(0);
  }

  .header__menu-toggle {
    display: flex;
  }

  header .nav-menu {
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    background-color: rgba(0, 0, 0, 0.98);
    flex-direction: column;
    padding: calc(var(--spacing-unit) * 4);
    gap: calc(var(--spacing-unit) * 3);
    transform: translateX(-100%);
    transition: var(--transition);
  }

  header .nav-menu.active {
    transform: translateX(0);
  }

  header .hamburger {
    display: flex;
  }

  /* Typography */
  h1 {
    font-size: 2.5rem;
    letter-spacing: 0.3rem;
  }

  h2 {
    font-size: 2rem;
    letter-spacing: 0.2rem;
  }

  h3 {
    font-size: 1.5rem;
  }

  .hero__logo {
    font-size: 2.5rem;
    letter-spacing: 0.5rem;
  }

  .hero__title {
    font-size: 1.8rem;
  }

  .page-hero__title {
    font-size: 2.5rem;
    letter-spacing: 0.3rem;
  }

  /* Grids */
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }

  /* Section */
  .section {
    padding: calc(var(--spacing-unit) * 10) 0;
  }

  .section__title {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 calc(var(--spacing-unit) * 3);
  }

  .hero__logo {
    font-size: 2rem;
    letter-spacing: 0.3rem;
  }

  .hero__title {
    font-size: 1.5rem;
  }

  .page-hero__title {
    font-size: 2rem;
  }
}

/* WORKS */
body.page-works .work-item__image {
  filter: grayscale(0%);
}

/* ==========================================
   WORKS Filter (works.html only)
   ========================================== */
.works-filter{
  display:flex;
  gap: calc(var(--spacing-unit) * 2);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: calc(var(--spacing-unit) * 6);
}

.works-filter__btn{
  background: transparent;
  color: var(--color-white);
  border: 1px solid var(--color-gray-medium);
  padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 3);
  font-family: var(--font-primary);
  font-size: 0.85rem;
  letter-spacing: 0.1rem;
  cursor: pointer;
  transition: var(--transition);
}

.works-filter__btn:hover{
  border-color: var(--color-white);
}

.works-filter__btn.is-active{
  background: var(--color-white);
  color: var(--color-black);
  border-color: var(--color-white);
}