/* ============================================================
   RYOTA SAITO — PORTFOLIO 2020–2025
   デザイン思想: 白ベース / 差し色は黄色1色 / 余白贅沢 / 影なし
   （~/.claude/DESIGN.md 準拠・元デッキ saito_portfolio_20251107 のデザイン言語を継承）
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  /* Primitive */
  --yellow: #FED905;          /* 表紙「PORTFOLIO」実測値 */
  --gray-900: #1a1a1a;
  --gray-500: #707070;
  --gray-300: #c8c8c8;
  --gray-200: #e0e0e0;
  --gray-100: #f5f5f5;
  --white: #ffffff;

  /* Semantic */
  --color-accent: var(--yellow);
  --color-text: var(--gray-900);
  --color-bg: var(--white);
  --color-rule: var(--gray-900);
  --color-rule-light: var(--gray-200);

  /* Type */
  --font-display: 'DIN Condensed', 'Avenir Next Condensed', 'Arial Narrow', 'A P-OTF A1ゴシック Std', 'Hiragino Kaku Gothic ProN', sans-serif;
  --font-en: 'Avenir Next', 'Avenir', -apple-system, sans-serif;
  --font-jp: 'A P-OTF A1ゴシック Std', 'A1ゴシック', 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', sans-serif;

  --fs-body: clamp(0.9375rem, 0.9rem + 0.2vw, 1.0625rem);   /* 15→17px */
  --fs-lead: clamp(1.25rem, 1.1rem + 0.8vw, 1.625rem);      /* 20→26px */
  --fs-worktitle: clamp(2.6rem, 1.6rem + 4.4vw, 5.4rem);
  --fs-concept: clamp(2.4rem, 1.4rem + 4.6vw, 5rem);
  --fs-label: clamp(1.5rem, 1.3rem + 0.9vw, 2.1rem);

  --measure-jp: 36em;

  /* Space (4px baseline) */
  --sp-1: 8px;
  --sp-2: 16px;
  --sp-3: 24px;
  --sp-4: 40px;
  --sp-5: 64px;
  --sp-6: 96px;
  --sp-7: 144px;

  --side: clamp(20px, 5vw, 72px);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-jp);
  font-size: var(--fs-body);
  font-weight: 500;
  line-height: 2.0;
  letter-spacing: 0.06em;
  color: var(--color-text);
  background: var(--color-bg);
  font-feature-settings: "palt" 1;
  font-kerning: normal;
  text-autospace: normal;
  -webkit-font-smoothing: antialiased;
}

@supports (text-spacing-trim: trim-start) {
  body { text-spacing-trim: trim-start; }
}

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

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

h1, h2, h3 { text-wrap: balance; word-break: auto-phrase; }

::selection { background: var(--color-accent); color: var(--gray-900); }

/* ---------- 汎用 ---------- */
.en {
  font-family: var(--font-en);
  letter-spacing: 0.08em;
}

.display {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--sp-3);
  padding: 14px var(--side);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-rule);
}

.site-brand {
  font-size: 1.25rem;
  letter-spacing: 0.06em;
}

.site-nav {
  display: flex;
  gap: clamp(12px, 2vw, 28px);
  overflow-x: auto;
  white-space: nowrap;
}

.site-nav a {
  font-family: var(--font-en);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
}

.site-nav a .no { color: var(--color-text); margin-right: 0.4em; }

.site-nav a:hover,
.site-nav a.is-current { border-bottom-color: var(--color-accent); }

/* ---------- Hero ---------- */
.hero {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  min-height: calc(100svh - 53px);
  border-bottom: 1px solid var(--color-rule);
}

.hero-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--sp-6) var(--side);
}

.hero-title {
  font-size: clamp(4.5rem, 13.5vw, 12.5rem);
  color: var(--color-accent);
  line-height: 0.92;
  letter-spacing: 0.01em;
}

.hero-sub {
  margin-top: var(--sp-2);
  font-family: var(--font-en);
  font-weight: 700;
  font-size: clamp(1rem, 1.6vw, 1.375rem);
  letter-spacing: 0.12em;
}

.hero-index {
  margin-top: clamp(40px, 7vh, 88px);
  list-style: none;
}

.hero-index li { border-top: 1px solid var(--color-rule); }
.hero-index li:last-child { border-bottom: 1px solid var(--color-rule); }

.hero-index a {
  display: grid;
  grid-template-columns: 3.2em 1fr auto;
  align-items: baseline;
  gap: var(--sp-2);
  padding: 14px 4px;
  transition: background 200ms ease-out;
}

.hero-index a:hover { background: var(--gray-100); }

.hero-index .no {
  font-family: var(--font-en);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
}

.hero-index .client {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.15rem, 1.8vw, 1.6rem);
  letter-spacing: 0.03em;
}

.hero-index .type {
  font-family: var(--font-en);
  font-weight: 600;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero-visual { position: relative; overflow: hidden; }

.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- Work section ---------- */
.work { border-bottom: 1px solid var(--color-rule); }

.work-head {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  min-height: 78svh;
}

.work-kv { overflow: hidden; }

.work-kv img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.work-intro {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--sp-6) var(--side);
}

.work-no {
  font-family: var(--font-en);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  margin-bottom: var(--sp-2);
}

.work-title {
  font-size: var(--fs-worktitle);
  color: var(--color-accent);
  letter-spacing: 0.015em;
  line-height: 0.98;
}

.work-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6em 2em;
  margin-top: var(--sp-2);
  padding-bottom: var(--sp-2);
  border-bottom: 1px solid var(--color-rule);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.work-lead {
  margin-top: var(--sp-4);
  font-size: var(--fs-lead);
  font-weight: 700;
  line-height: 1.6;
  letter-spacing: 0.06em;
}

.work-desc {
  margin-top: var(--sp-3);
  max-width: var(--measure-jp);
}

/* ---------- Concept band ---------- */
.concept {
  padding: var(--sp-7) var(--side) 0;
  max-width: 1280px;
  margin-inline: auto;
}

.concept-en {
  font-size: var(--fs-concept);
  color: var(--color-accent);
  letter-spacing: 0.02em;
}

.concept-ja {
  display: inline-block;
  margin-top: var(--sp-2);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-rule);
  font-size: clamp(0.95rem, 1.4vw, 1.2rem);
  font-weight: 700;
  letter-spacing: 0.1em;
}

/* ---------- Work body ---------- */
.work-body {
  max-width: 1280px;
  margin-inline: auto;
  padding: var(--sp-5) var(--side) var(--sp-7);
}

.cols-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-5);
  margin-top: var(--sp-5);
}

.block { margin-top: var(--sp-5); }

.block-label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-label);
  letter-spacing: 0.02em;
  line-height: 1;
  margin-bottom: var(--sp-2);
}

.block h4 {
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.8;
  margin-bottom: var(--sp-1);
}

.block h4 + p { margin-top: 0; }

.block p { max-width: var(--measure-jp); }

.block p + h4 { margin-top: var(--sp-3); }

/* Execution 項目 */
.exec-item { margin-top: var(--sp-4); }

.exec-item .cap {
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-bottom: var(--sp-1);
}

.exec-item .cap::before { content: "■"; margin-right: 0.35em; font-size: 0.8em; }

.exec-item p { max-width: var(--measure-jp); }

/* ---------- 画像グリッド ---------- */
.media { margin-top: var(--sp-2); }

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-cap {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin: var(--sp-4) 0 var(--sp-1);
}

.media-cap::before { content: "■"; margin-right: 0.35em; font-size: 0.85em; }

.grid { display: grid; gap: 10px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }

.grid img { aspect-ratio: var(--ar, auto); }

/* 混合比率の1行グリッド（高さ揃え） */
.row-mix { display: grid; gap: 10px; align-items: stretch; }
.row-mix img { height: 100%; }

.row-sao-street { grid-template-columns: 2.09fr 0.57fr; }
.row-nwm-webcm { grid-template-columns: 1fr 2.1fr; }
.row-nwm-fukai { grid-template-columns: 1.5fr 0.57fr 0.57fr 0.57fr; }
.row-nwm-news { grid-template-columns: 1.62fr 0.46fr 0.46fr; }

.stack { display: grid; gap: 10px; }

/* ---------- CM字コンテ引用（縦書き） ---------- */
.cm-script {
  writing-mode: vertical-rl;
  font-family: 'Hiragino Mincho ProN', 'Yu Mincho', serif;
  font-size: 0.9375rem;
  line-height: 2.4;
  letter-spacing: 0.14em;
  padding: var(--sp-3);
  border: 1px solid var(--color-rule);
  min-height: 300px;
  max-height: 480px;
}

.cm-script .role { font-weight: 600; }

/* ---------- Growth ---------- */
.growth-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-4);
  margin: var(--sp-3) 0 var(--sp-4);
}

.stat { border-top: 1px solid var(--color-rule); padding-top: var(--sp-2); }

.stat .num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.2rem, 4.2vw, 3.8rem);
  line-height: 1;
  letter-spacing: 0.01em;
}

.stat .num .u {
  background: linear-gradient(transparent 78%, var(--color-accent) 78%);
  padding-bottom: 0.04em;
}

.stat .lbl {
  margin-top: var(--sp-1);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}

/* ---------- Profile ---------- */
.profile { border-bottom: 1px solid var(--color-rule); }

.profile .work-body { padding-top: var(--sp-7); }

.profile-label { font-size: var(--fs-concept); color: var(--color-accent); }

.profile-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--sp-5);
  margin-top: var(--sp-4);
}

.profile-name {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 700;
  letter-spacing: 0.14em;
  line-height: 1.3;
}

.profile-role {
  margin-top: var(--sp-1);
  padding-bottom: var(--sp-2);
  border-bottom: 1px solid var(--color-rule);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
}

.profile-bio {
  margin-top: var(--sp-3);
  max-width: var(--measure-jp);
}

.profile-timeline { list-style: none; }

.profile-timeline li {
  display: grid;
  grid-template-columns: 7.5em 1fr;
  gap: var(--sp-2);
  align-items: baseline;
  padding: 14px 4px;
  border-top: 1px solid var(--color-rule);
}

.profile-timeline li:last-child { border-bottom: 1px solid var(--color-rule); }

.profile-timeline .year {
  font-weight: 700;
  font-size: 0.8rem;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--gray-900);
  color: var(--white);
  padding: var(--sp-7) var(--side) var(--sp-5);
}

.footer-title {
  font-size: clamp(3rem, 9vw, 8rem);
  color: var(--color-accent);
  line-height: 0.95;
}

.footer-sub {
  margin-top: var(--sp-2);
  font-family: var(--font-en);
  font-weight: 700;
  font-size: clamp(0.9rem, 1.4vw, 1.2rem);
  letter-spacing: 0.12em;
}

.footer-meta {
  margin-top: var(--sp-6);
  padding-top: var(--sp-2);
  border-top: 1px solid rgba(255, 255, 255, 0.35);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-2);
  font-family: var(--font-en);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
}

/* ---------- スクロール表示アニメーション ---------- */
.fade {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 500ms ease-out, transform 500ms ease-out;
}

.fade.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .fade { opacity: 1; transform: none; transition: none; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ---------- Responsive ---------- */
section[id] { scroll-margin-top: 60px; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; min-height: 0; }
  .hero-visual { order: -1; max-height: 46svh; }
  .hero-text { padding: var(--sp-5) var(--side); }

  .work-head { grid-template-columns: 1fr; min-height: 0; }
  .work-kv { max-height: 58svh; }
  .work-intro { padding: var(--sp-5) var(--side); }

  .cols-2 { grid-template-columns: 1fr; gap: var(--sp-4); }

  .profile-grid { grid-template-columns: 1fr; gap: var(--sp-4); }

  .growth-stats { grid-template-columns: 1fr; gap: var(--sp-3); }

  .grid-4, .grid-5 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }

  .concept { padding-top: var(--sp-6); }
  .work-body { padding-bottom: var(--sp-6); }

  .cm-script { min-height: 240px; }
}

@media (max-width: 560px) {
  .site-nav a .label { display: none; }
  .row-nwm-webcm { grid-template-columns: 1fr; }
  .row-nwm-news { grid-template-columns: 1fr 1fr 1fr; }
}