/* =============================================
   aoitori design — style.css
   デザインシステム: juri-portfolio スタイルガイド準拠
   ============================================= */

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

/* --- Design Tokens --- */
:root {
  /* Colors */
  --color-bg: #fafaf8;
  --color-bg-alt: #f3f2ee;
  --color-text: #1a1a1a;
  --color-text-sub: #6b6b6b;
  --color-text-light: #a0a0a0;
  --color-border: #e5e5e2;
  --color-title: #00b2c4;
  --color-h2: #0080ae;
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 8rem;
  --space-2xl: 12rem;
  --space-3xl: 16rem;

  /* Typography */
  --font-serif: 'Cormorant Garamond', serif;
  --font-sans: 'Jost', sans-serif;
  --font-ja: 'Noto Serif JP', serif;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-md: 1.125rem;
  --text-lg: 1.5rem;
  --text-xl: 2.5rem;
  --text-2xl: 4rem;
  --text-3xl: 7rem;

  --font-thin: 300;
  --font-regular: 400;
  --font-medium: 500;

  --leading-tight: 1.2;
  --leading-normal: 1.6;
  --leading-loose: 1.9;

  --tracking-tight: -0.03em;
  --tracking-normal: 0;
  --tracking-wide: 0.08em;
  --tracking-widest: 0.2em;
}

/* --- Global --- */
html {
  scroll-behavior: smooth;
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-ja);
  font-weight: var(--font-thin);
  line-height: var(--leading-normal);
  overflow-x: hidden;
}

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

/* =============================================
   HEADER
   ============================================= */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(1.5rem, 5vw, 5rem);
  transition:
    background 0.4s ease,
    backdrop-filter 0.4s ease;
}

header.scrolled {
  background: rgba(250, 250, 248, 0.88);
  backdrop-filter: blur(12px);
}

.logo {
  font-family: var(--font-sans);
  font-size: 1.1rem;
  font-weight: var(--font-thin);
  letter-spacing: 0.18em;
  color: var(--color-title);
  text-decoration: none;
  text-transform: lowercase;
}

nav {
  display: flex;
  gap: 2.5rem;
  align-items: center;
}

nav a {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: var(--font-regular);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-title);
  text-decoration: none;
  position: relative;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-text);
  transition: width 0.3s ease;
}

nav a:hover::after {
  width: 100%;
}

/* =============================================
   HERO
   ============================================= */
#hero {
  margin-top: 80px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 0 clamp(1.5rem, 5vw, 5rem) var(--space-lg);
  position: relative;
  overflow: hidden;
}

.hero-inner {
  padding-bottom: var(--space-lg);
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(4rem, 10vw, 9rem);
  font-weight: var(--font-thin);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  animation: fadeInUp 0.9s cubic-bezier(0.25, 0.46, 0.45, 0.94) both;
}

.hero-sub-line {
  width: 4rem;
  height: 1px;
  background: var(--color-text-sub);
  margin: 1.5rem 0 1rem;
  animation: fadeInUp 0.9s cubic-bezier(0.25, 0.46, 0.45, 0.94) 0.15s both;
}

.hero-sub {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  letter-spacing: var(--tracking-widest);
  color: var(--color-text-sub);
  animation: fadeInUp 0.9s cubic-bezier(0.25, 0.46, 0.45, 0.94) 0.25s both;
}

.hero-catch {
  font-family: var(--font-ja);
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  font-weight: var(--font-thin);
  line-height: var(--leading-loose);
  letter-spacing: var(--tracking-wide);
  margin-top: var(--space-md);
  color: var(--color-text);
  animation: fadeInUp 0.9s cubic-bezier(0.25, 0.46, 0.45, 0.94) 0.35s both;
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  right: clamp(1.5rem, 5vw, 5rem);
  bottom: 3rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  animation: fadeInUp 0.9s 0.5s both;
}

.scroll-indicator span {
  font-family: var(--font-sans);
  font-size: 0.6rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-text-light);
  writing-mode: vertical-rl;
}

.scroll-line {
  width: 1px;
  height: 4rem;
  background: var(--color-border);
  position: relative;
  overflow: hidden;
}

.scroll-line::after {
  content: '';
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-text-sub);
  animation: scrollAnim 2s ease infinite;
}

/* =============================================
   SECTION BASE
   ============================================= */
section {
  padding: var(--space-xl) clamp(1.5rem, 5vw, 5rem);
}

.section-heading {
  margin-bottom: var(--space-lg);
}

.section-heading__en {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: var(--font-thin);
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--color-h2);
}

.section-heading__ja {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  color: var(--color-text-sub);
  margin-top: 0.5rem;
  text-transform: uppercase;
}

/* =============================================
   WORKS
   ============================================= */
#works {
  background: var(--color-bg);
}

.works-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.works-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 4rem 3rem;
}

/* Work Card */
.work-card {
  display: block;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.work-card:hover {
  transform: translateY(-4px);
}

.work-card__image-wrap {
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--color-bg-alt);
}

.work-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
  display: block;
}

.work-card:hover .work-card__image {
  transform: scale(1.03);
}

/* Placeholder (画像なしの場合) */
.work-img-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-alt);
  transition: transform 0.6s ease;
}

.work-card:hover .work-img-placeholder {
  transform: scale(1.03);
}

.work-img-placeholder svg {
  opacity: 0.18;
}

.work-img-placeholder--alt {
  background: #f3f2ee;
}

.work-card__meta {
  padding-top: 1.25rem;
}

.work-card__category {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-sub);
}

.work-card__title {
  font-family: var(--font-ja);
  font-size: var(--text-base);
  font-weight: var(--font-regular);
  margin-top: 0.3rem;
  color: var(--color-text);
}

.work-card__year {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  color: var(--color-text-light);
  margin-top: 0.2rem;
}

/* =============================================
   ABOUT
   ============================================= */
#about {
  background: var(--color-bg-alt);
}

.about-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  align-items: start;
}

.about-text p {
  font-size: 0.95rem;
  line-height: var(--leading-loose);
  letter-spacing: 0.04em;
  color: var(--color-text);
}

.about-text p + p {
  margin-top: 1.25rem;
}

/* Skills */
.skills-block {
  margin-top: var(--space-md);
}

.skills-label {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-text-sub);
  margin-bottom: 1rem;
}

.skills-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  border: 1px solid var(--color-border);
  padding: 0.35rem 0.8rem;
  color: var(--color-text-sub);
}

/* Tools */
.tools-label {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-text-sub);
  margin-bottom: 1.5rem;
}

.tools-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm) var(--space-md);
}

.tool-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.tool-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-text-sub);
  flex-shrink: 0;
}

.tool-name {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--color-text);
}

/* =============================================
   CONTACT
   ============================================= */
#contact {
  background: var(--color-bg);
}

.contact-inner {
  max-width: 720px;
  margin: 0 auto;
}

.contact-lead {
  font-size: 0.9rem;
  line-height: var(--leading-loose);
  color: var(--color-text-sub);
  margin-bottom: var(--space-lg);
}

.form-row {
  margin-bottom: 1.75rem;
}

.form-label {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-text-sub);
  display: block;
  margin-bottom: 0.6rem;
}

.form-input,
.form-textarea {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--color-border);
  padding: 0.6rem 0;
  font-family: var(--font-ja);
  font-size: 0.9rem;
  font-weight: var(--font-thin);
  color: var(--color-text);
  outline: none;
  transition: border-color 0.3s ease;
  resize: none;
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--color-text);
}

.form-textarea {
  height: 6rem;
}

/* Button */
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.9rem 2.5rem;
  border: 1px solid var(--color-text);
  background: transparent;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-text);
  cursor: pointer;
  transition:
    background 0.3s ease,
    color 0.3s ease;
  margin-top: var(--space-sm);
}

.btn-outline:hover {
  background: var(--color-title);
  color: var(--color-bg);
}

.form-note {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  color: var(--color-text-light);
  margin-top: 0.75rem;
  min-height: 1.2em;
}

/* =============================================
   FOOTER
   ============================================= */
footer {
  border-top: 1px solid var(--color-border);
  padding: 3rem clamp(1.5rem, 5vw, 5rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.copyright {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-text-light);
}

.social-links {
  display: flex;
  gap: 2rem;
}

.social-links a {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-sub);
  text-decoration: none;
  position: relative;
}

.social-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-text-sub);
  transition: width 0.3s ease;
}

.social-links a:hover::after {
  width: 100%;
}

/* =============================================
   ANIMATIONS
   ============================================= */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scrollAnim {
  to {
    top: 200%;
  }
}

.fade-in {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 0.7s ease,
    transform 0.7s ease;
}

.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  .fade-in {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .hero-title,
  .hero-sub-line,
  .hero-sub,
  .hero-catch,
  .scroll-indicator {
    animation: none;
    opacity: 1;
  }
  .scroll-line::after {
    animation: none;
  }
}

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 900px) {
  .works-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .about-inner {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 767px) {
  nav {
    gap: 1.5rem;
  }

  .hero-title {
    font-size: clamp(3rem, 16vw, 7rem);
  }

  .section-heading__en {
    font-size: clamp(2.5rem, 12vw, 5rem);
  }

  footer {
    flex-direction: column;
    gap: 1.5rem;
    text-align: center;
  }
}