/* === 乃希の個人サイト — 和風ミニマル === */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Noto+Serif+SC:wght@400;600;700&display=swap');

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

:root {
  --ink: #2d2d2b;
  --ink-light: #6b6b66;
  --ink-faint: #a0a099;
  --white: #ffffff;
  --snow: #fcfcfb;
  --border: #e8e5e0;
  --border-light: #f0ede9;
  --akane: #b64a3a;       /* 茜色 — accent */
  --akane-soft: #fdf6f4;
  --kogane: #b8952e;      /* 金色 — secondary accent */
  --shadow: 0 0 0 1px rgba(0,0,0,.03), 0 2px 8px rgba(0,0,0,.04);
  --shadow-hover: 0 0 0 1px rgba(0,0,0,.04), 0 4px 20px rgba(0,0,0,.07);
  --radius: 4px;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "SimSun", "YuMincho", serif;
  /*
   * 中文大站通用字体栈（B站/京东/淘宝同款）：
   * Mac → 苹方  /  Windows → 微软雅黑  /  英文 → Inter
   */
  --font-sans: "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --max-w: 1040px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-weight: 400;
  background: var(--white);
  color: var(--ink);
  line-height: 1.85;
  letter-spacing: .02em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* === Typography === */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: .04em;
}

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

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

/* === Header — 和風ナビゲーション === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  height: 64px;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  letter-spacing: .06em;
}

.brand-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
}

.brand-name {
  color: var(--ink);
  font-weight: 600;
}

/* === Navigation === */
.nav {
  display: flex;
  gap: 0;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav a {
  padding: 8px 18px;
  font-size: .92rem;
  color: var(--ink-light);
  letter-spacing: .04em;
  font-weight: 400;
  position: relative;
  transition: color .25s;
}

.nav a::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 18px;
  right: 18px;
  height: 1px;
  background: var(--akane);
  transform: scaleX(0);
  transition: transform .25s;
}

.nav a:hover,
.nav a:focus-visible {
  color: var(--ink);
}

.nav a:hover::after {
  transform: scaleX(1);
}

/* === Menu Button (mobile) === */
.menu-button {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px 4px;
}

.menu-button span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--ink);
  transition: transform .3s, opacity .3s;
}

.menu-button[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.menu-button[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
  transform: rotate(-45deg);
}

/* === Main === */
main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 40px;
}

/* === Hero — ヒーロー === */
.hero {
  display: flex;
  gap: 64px;
  align-items: center;
  padding: 72px 0 80px;
  border-bottom: 1px solid var(--border-light);
}

.hero-copy {
  flex: 1;
  min-width: 0;
}

.eyebrow {
  font-size: .7rem;
  font-weight: 500;
  letter-spacing: .16em;
  color: var(--ink-faint);
  margin-bottom: 16px;
  text-transform: uppercase;
}

.hero h1 {
  font-size: 2.8rem;
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: .06em;
  margin-bottom: 16px;
  color: var(--ink);
}

.hero-tagline {
  font-size: 1rem;
  color: var(--ink-light);
  margin-bottom: 20px;
  line-height: 1.8;
  font-weight: 400;
}

.hero-meta {
  display: flex;
  gap: 24px;
  font-size: .8rem;
  color: var(--ink-faint);
  font-weight: 400;
}

.hero-meta span {
  display: flex;
  align-items: center;
  gap: 8px;
}

.hero-meta span::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  background: var(--akane);
}

/* Hero panel */
.hero-panel {
  flex: 0 0 320px;
  background: var(--white);
  border: 1px solid var(--border-light);
  overflow: hidden;
}

.hero-image {
  width: 100%;
  aspect-ratio: 1;
  background: var(--snow);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-faint);
  font-size: .8rem;
}

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

.hero-panel > p {
  padding: 20px 24px;
  font-size: .85rem;
  color: var(--ink-light);
  line-height: 1.8;
  font-weight: 400;
}

/* === Overview — インデックス === */
.overview {
  display: flex;
  gap: 64px;
  padding: 72px 0;
  border-bottom: 1px solid var(--border-light);
}

.index-panel {
  flex: 0 0 200px;
  position: sticky;
  top: 88px;
  align-self: flex-start;
}

.index-panel h2 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: .06em;
}

.index-panel > p {
  font-size: .85rem;
  color: var(--ink-faint);
  margin-bottom: 24px;
  line-height: 1.7;
  font-weight: 400;
}

.index-panel ol {
  list-style: none;
  counter-reset: idx;
}

.index-panel ol li {
  counter-increment: idx;
}

.index-panel ol li a {
  display: block;
  padding: 7px 0;
  font-size: .9rem;
  color: var(--ink-light);
  letter-spacing: .04em;
  border-bottom: 1px solid var(--border-light);
  transition: all .2s;
  font-weight: 400;
}

.index-panel ol li a:hover {
  color: var(--ink);
  padding-left: 6px;
  border-bottom-color: var(--border);
}

/* === Feature List === */
.feature-list {
  flex: 1;
  min-width: 0;
}

/* === Toolbar === */
.toolbar {
  display: flex;
  gap: 12px;
  margin-bottom: 40px;
  align-items: center;
}

.search-box {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--snow);
  border: 1px solid var(--border-light);
  padding: 12px 18px;
  transition: all .3s;
}

.search-box:focus-within {
  border-color: var(--border);
  background: var(--white);
}

.search-box span {
  font-size: .75rem;
  color: var(--ink-faint);
  white-space: nowrap;
  letter-spacing: .04em;
  font-weight: 400;
}

.search-box input {
  flex: 1;
  border: none;
  outline: none;
  background: none;
  font-size: .88rem;
  font-family: var(--font-sans);
  color: var(--ink);
  font-weight: 400;
}

.search-box input::placeholder {
  color: var(--ink-faint);
}

.ghost-button {
  padding: 12px 22px;
  border: 1px solid var(--border-light);
  background: var(--white);
  font-size: .8rem;
  font-family: var(--font-sans);
  cursor: pointer;
  color: var(--ink-light);
  letter-spacing: .04em;
  transition: all .25s;
  font-weight: 400;
}

.ghost-button:hover {
  border-color: var(--border);
  color: var(--ink);
}

/* === Section Blocks === */
.section-block {
  margin-bottom: 72px;
  scroll-margin-top: 88px;
}

.section-header {
  margin-bottom: 28px;
}

.section-header .eyebrow {
  margin-bottom: 6px;
}

.section-header h3 {
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 10px;
  letter-spacing: .06em;
}

.section-header .section-desc {
  font-size: .85rem;
  color: var(--ink-faint);
  font-weight: 400;
}

.section-header .section-tags {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.tag {
  display: inline-block;
  padding: 3px 12px;
  background: var(--snow);
  color: var(--ink-light);
  border: 1px solid var(--border-light);
  font-size: .72rem;
  font-weight: 400;
  letter-spacing: .04em;
}

/* === Items Grid === */
.items-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1px;
  background: var(--border-light);
  border: 1px solid var(--border-light);
}

/* Tutorial list layout + video (keep original light theme) */
.items-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.items-list .item-card-list {
  border: 1px solid var(--border-light);
  background: var(--white);
  overflow: hidden;
}

.item-card .card-video {
  position: relative;
  width: 100%;
  background: #0a0a0a;
  line-height: 0;
  aspect-ratio: 16 / 9;
}

.item-card .card-video iframe,
.item-card .card-video video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
  background: #000;
}

.item-card .card-video-fallback {
  aspect-ratio: auto;
  padding: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--snow, #f7f7f5);
  line-height: 1.4;
}

.item-card {
  background: var(--white);
  overflow: hidden;
  transition: all .3s;
}

.item-card:hover {
  box-shadow: var(--shadow-hover);
  position: relative;
  z-index: 2;
}

.item-card .card-image {
  width: 100%;
  background: none;
  overflow: hidden;
  cursor: pointer;
  line-height: 0;
}

.item-card .card-image img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform .6s, filter .4s;
  filter: grayscale(.05);
}

.item-card:hover .card-image img {
  transform: scale(1.03);
  filter: grayscale(0);
}

.item-card .card-body {
  padding: 20px 22px;
}

.item-card .card-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: .9rem;
  margin-bottom: 4px;
  letter-spacing: .04em;
}

.item-card .card-meta {
  font-size: .7rem;
  color: var(--ink-faint);
  margin-bottom: 10px;
  letter-spacing: .06em;
  font-weight: 400;
}

.item-card .card-text {
  font-size: .82rem;
  color: var(--ink-light);
  line-height: 1.8;
  white-space: pre-line;
  font-weight: 400;
}

.item-card .card-url {
  display: inline-block;
  margin-top: 12px;
  font-size: .78rem;
  color: var(--akane);
  font-weight: 400;
  letter-spacing: .04em;
  transition: opacity .2s;
}

.item-card .card-url:hover {
  opacity: .7;
}

/* === Protection Banner === */
.protection-banner {
  background: var(--snow);
  border: 1px solid var(--border-light);
  padding: 32px 24px;
  text-align: center;
}

.protection-banner p {
  font-size: .85rem;
  color: var(--ink-light);
  margin-bottom: 16px;
  font-weight: 400;
}

.protection-banner input {
  padding: 10px 16px;
  border: 1px solid var(--border-light);
  font-size: .88rem;
  font-family: var(--font-sans);
  width: 220px;
  margin-right: 10px;
  background: var(--white);
  font-weight: 400;
}

.protection-banner input:focus {
  outline: none;
  border-color: var(--border);
}

.protection-banner .unlock-btn {
  padding: 10px 24px;
  background: var(--ink);
  color: var(--white);
  border: none;
  font-size: .82rem;
  font-family: var(--font-sans);
  cursor: pointer;
  letter-spacing: .04em;
  transition: opacity .2s;
}

.protection-banner .unlock-btn:hover {
  opacity: .85;
}

.protection-error {
  color: var(--akane);
  font-size: .78rem;
  margin-top: 12px;
}

/* === Social Band === */
.social-band {
  padding: 72px 0 96px;
}

.social-band h2 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 32px;
  letter-spacing: .06em;
}

.social-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1px;
  background: var(--border-light);
  border: 1px solid var(--border-light);
}

.social-card {
  background: var(--white);
  padding: 24px;
  transition: all .25s;
}

.social-card:hover {
  box-shadow: var(--shadow-hover);
  position: relative;
  z-index: 2;
}

.social-card .platform {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: .88rem;
  margin-bottom: 6px;
  letter-spacing: .04em;
}

.social-card .handle {
  font-size: .82rem;
  color: var(--ink-light);
  font-weight: 400;
}

.social-card .note {
  font-size: .78rem;
  color: var(--ink-faint);
  margin-top: 8px;
  font-weight: 400;
}

/* === Footer === */
footer {
  text-align: center;
  padding: 40px;
  font-size: .75rem;
  color: var(--ink-faint);
  border-top: 1px solid var(--border-light);
  letter-spacing: .06em;
  font-weight: 400;
}

/* === Lightbox === */
.lightbox {
  border: none;
  padding: 0;
  background: rgba(20,20,18,.94);
  width: 100vw;
  height: 100vh;
  max-width: 100vw;
  max-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.lightbox::backdrop {
  background: rgba(20,20,18,.94);
}

.lightbox img {
  max-width: 92vw;
  max-height: 88vh;
  object-fit: contain;
  cursor: default;
  border-radius: 2px;
}

.lightbox-close {
  position: fixed;
  top: 16px;
  right: 16px;
  background: rgba(255,255,255,.15);
  border: none;
  color: #fff;
  width: 48px;
  height: 48px;
  font-size: 1.5rem;
  cursor: pointer;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .2s;
  z-index: 10;
  -webkit-tap-highlight-color: transparent;
}

.lightbox-close:hover {
  background: rgba(255,255,255,.3);
}

.lightbox p {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  color: #fff;
  font-size: .85rem;
  opacity: .6;
  text-align: center;
  max-width: 80vw;
  font-weight: 400;
  pointer-events: none;
}

/* === Empty State === */
.empty-state {
  text-align: center;
  padding: 48px 32px;
  color: var(--ink-faint);
  font-size: .82rem;
  background: var(--snow);
  font-weight: 400;
}

/* === Responsive === */

/* —— 平板（iPad / 小笔记本） —— */
@media (max-width: 1024px) {
  .hero {
    gap: 40px;
    padding: 56px 0 64px;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .hero-panel {
    flex: 0 0 280px;
  }

  .overview {
    gap: 40px;
  }

  .index-panel {
    flex: 0 0 170px;
  }
}

/* —— 手机 / 小平板 —— */
@media (max-width: 768px) {
  main {
    padding: 0 24px;
  }

  .site-header {
    padding: 0 24px;
  }

  /* Hero 竖排 */
  .hero {
    flex-direction: column;
    gap: 32px;
    padding: 40px 0 48px;
  }

  .hero h1 {
    font-size: 1.9rem;
  }

  .hero-tagline {
    font-size: .95rem;
  }

  .hero-panel {
    flex: none;
    width: 100%;
  }

  .hero-image {
    aspect-ratio: 16/9;
  }

  /* 分栏变横向标签 */
  .overview {
    flex-direction: column;
    gap: 28px;
    padding: 40px 0;
  }

  .index-panel {
    position: static;
    flex: none;
  }

  .index-panel ol {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
  }

  .index-panel ol li a {
    border-bottom: none;
    padding: 6px 14px;
    background: var(--snow);
    font-size: .82rem;
  }

  /* 汉堡菜单 */
  .menu-button {
    display: flex;
  }

  .nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 8px 24px 16px;
    border-bottom: 1px solid var(--border-light);
    gap: 0;
    box-shadow: 0 8px 24px rgba(0,0,0,.06);
  }

  .nav.open {
    display: flex;
  }

  .nav a::after {
    display: none;
  }

  .nav a {
    padding: 14px 0;
    border-bottom: 1px solid var(--border-light);
    font-size: .95rem;
  }

  /* 卡片单列 */
  .items-grid {
    grid-template-columns: 1fr;
  }

  .item-card .card-image {
    aspect-ratio: 16/10;
  }

  .social-grid {
    grid-template-columns: 1fr 1fr;
  }

  .social-band {
    padding: 48px 0 64px;
  }
}

/* —— 小手机 —— */
@media (max-width: 480px) {
  main {
    padding: 0 16px;
  }

  .site-header {
    padding: 0 16px;
  }

  .brand {
    font-size: .95rem;
    gap: 8px;
  }

  .brand-mark {
    width: 30px;
    height: 30px;
    font-size: .95rem;
  }

  .hero {
    padding: 32px 0 40px;
  }

  .hero h1 {
    font-size: 1.6rem;
  }

  .hero-tagline {
    font-size: .9rem;
  }

  .hero-meta {
    flex-direction: column;
    gap: 8px;
  }

  .hero-panel > p {
    padding: 14px 16px;
    font-size: .82rem;
  }

  .index-panel ol li a {
    font-size: .78rem;
    padding: 5px 10px;
  }

  .toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .ghost-button {
    text-align: center;
  }

  .section-header h3 {
    font-size: 1.2rem;
  }

  .social-grid {
    grid-template-columns: 1fr;
  }

  .social-band {
    padding: 40px 0 56px;
  }
}