/*
Theme Name: CVI Whitepaper
Description: A focused, brand-aligned theme for Chuo Vision Institute material downloads.
Version: 0.2.2
Requires at least: 6.6
Requires PHP: 8.1
Text Domain: cvi-whitepaper
*/

@font-face {
  font-family: "Noto Sans JP";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("assets/fonts/NotoSansJP-Regular.woff2") format("woff2");
}

@font-face {
  font-family: "Noto Sans JP";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("assets/fonts/NotoSansJP-Bold.woff2") format("woff2");
}

:root {
  --cvi-paper: #fcf3e4;
  --cvi-ink: #3a2015;
  --cvi-brand: #bf6034;
  --cvi-accent: #2e6a6b;
  --cvi-paper-soft: color-mix(in srgb, var(--cvi-paper) 88%, var(--cvi-brand));
  --cvi-paper-deep: color-mix(in srgb, var(--cvi-paper) 76%, var(--cvi-brand));
  --cvi-ink-mid: color-mix(in srgb, var(--cvi-ink) 84%, var(--cvi-paper));
  --cvi-ink-sub: color-mix(in srgb, var(--cvi-ink) 68%, var(--cvi-paper));
  --cvi-brand-deep: color-mix(in srgb, var(--cvi-brand) 78%, var(--cvi-ink));
  --cvi-line: color-mix(in srgb, var(--cvi-ink) 16%, transparent);
  --cvi-serif: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", system-ui, sans-serif;
  --cvi-sans: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", system-ui, sans-serif;
  --cvi-shadow: 0 24px 70px rgba(58, 32, 21, 0.13);
}

html {
  scroll-behavior: smooth;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--cvi-ink);
  background: var(--cvi-paper);
  font-family: var(--cvi-sans);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

.screen-reader-text {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.cvi-skip-link:focus {
  z-index: 10000;
  width: auto;
  height: auto;
  margin: 0;
  padding: 0.75rem 1rem;
  clip: auto;
  background: #fff;
}

.cvi-site-header {
  position: relative;
  z-index: 10;
  border-bottom: 1px solid var(--cvi-line);
  background: color-mix(in srgb, var(--cvi-paper) 92%, transparent);
  backdrop-filter: blur(14px);
}

.cvi-site-header__inner,
.cvi-site-footer__inner,
.cvi-material-hero__inner,
.cvi-material-layout,
.cvi-library-hero__inner,
.cvi-library-content,
.cvi-generic-main {
  width: min(1180px, calc(100% - 40px));
  margin-inline: auto;
}

.cvi-site-header__inner {
  min-height: 86px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.custom-logo-link {
  display: inline-flex;
  align-items: center;
}

.custom-logo {
  display: block;
  width: auto;
  max-width: min(330px, 56vw);
  height: auto;
  max-height: 48px;
}

.cvi-wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  text-decoration: none;
}

.cvi-wordmark__mark {
  position: relative;
  width: 38px;
  height: 38px;
  border: 1px solid var(--cvi-brand);
  border-radius: 50%;
}

.cvi-wordmark__mark::before,
.cvi-wordmark__mark::after {
  content: "";
  position: absolute;
  border: 1px solid var(--cvi-brand);
  border-radius: 50%;
}

.cvi-wordmark__mark::before {
  inset: 6px;
}

.cvi-wordmark__mark::after {
  inset: 12px;
  background: var(--cvi-brand);
}

.cvi-wordmark__text {
  display: grid;
  gap: 0.1rem;
}

.cvi-wordmark__text strong {
  font-family: var(--cvi-serif);
  font-size: 0.98rem;
  letter-spacing: 0.08em;
}

.cvi-wordmark__text small {
  color: var(--cvi-ink-sub);
  font-size: 0.55rem;
  letter-spacing: 0.17em;
}

.cvi-site-header__label {
  color: var(--cvi-ink-sub);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
}

.cvi-material-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(4.5rem, 8vw, 7.5rem) 0 clamp(4rem, 7vw, 6.5rem);
  background:
    radial-gradient(circle at 82% 13%, rgba(191, 96, 52, 0.12), transparent 27rem),
    linear-gradient(180deg, var(--cvi-paper) 0%, #f9eedf 100%);
}

.cvi-material-hero::after {
  content: "";
  position: absolute;
  right: -6rem;
  bottom: -10rem;
  width: 31rem;
  height: 31rem;
  border: 1px solid rgba(191, 96, 52, 0.18);
  border-radius: 50%;
  box-shadow: inset 0 0 0 5rem rgba(255, 255, 255, 0.1), inset 0 0 0 10rem rgba(191, 96, 52, 0.035);
}

.cvi-material-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
  align-items: center;
  gap: clamp(3rem, 8vw, 8rem);
}

.cvi-eyebrow {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin: 0 0 1.4rem;
  color: var(--cvi-brand-deep);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
}

.cvi-eyebrow::before {
  content: "";
  width: 2.5rem;
  height: 1px;
  background: currentColor;
}

.cvi-material-hero h1 {
  max-width: 20em;
  margin: 0;
  font-family: var(--cvi-serif);
  font-size: clamp(1.6rem, 2.6vw, 2.25rem);
  line-height: 1.45;
  letter-spacing: 0.01em;
  text-wrap: pretty;
}

.cvi-material-hero__lead {
  max-width: 38rem;
  margin: 1.7rem 0 0;
  color: var(--cvi-ink-mid);
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  line-height: 2;
}

.cvi-material-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
}

.cvi-material-hero__meta li {
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--cvi-line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.35);
  font-size: 0.76rem;
  font-weight: 700;
}

.cvi-material-cover {
  position: relative;
  width: min(100%, 340px);
  aspect-ratio: 0.76;
  justify-self: center;
  padding: 2.1rem;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--cvi-ink) 18%, transparent);
  background: var(--cvi-ink);
  box-shadow: var(--cvi-shadow), 18px 18px 0 var(--cvi-paper-deep);
  color: var(--cvi-paper);
  transform: rotate(1.5deg);
}

.cvi-material-cover::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(145deg, transparent 42%, color-mix(in srgb, var(--cvi-brand) 88%, transparent) 42% 58%, transparent 58%),
    radial-gradient(circle at 78% 23%, transparent 0 3.5rem, color-mix(in srgb, var(--cvi-paper) 22%, transparent) 3.55rem 3.62rem, transparent 3.67rem);
}

.cvi-material-cover__brand,
.cvi-material-cover__title,
.cvi-material-cover__footer {
  position: relative;
  z-index: 1;
}

.cvi-material-cover__brand {
  display: block;
  font-size: 0.58rem;
  letter-spacing: 0.16em;
}

.cvi-material-cover__title {
  display: block;
  margin-top: 4rem;
  font-family: var(--cvi-serif);
  font-size: clamp(1rem, 1.6vw, 1.3rem);
  font-weight: 700;
  line-height: 1.5;
}

.cvi-material-cover__footer {
  position: absolute;
  left: 2.1rem;
  bottom: 2rem;
  font-size: 0.67rem;
  letter-spacing: 0.12em;
  opacity: 0.72;
}

.cvi-material-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.78fr);
  align-items: start;
  gap: clamp(3rem, 8vw, 7.5rem);
  padding-block: clamp(4.5rem, 8vw, 7.5rem);
}

.cvi-material-copy {
  min-width: 0;
}

.cvi-section-label {
  margin: 0 0 1rem;
  color: var(--cvi-brand-deep);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.18em;
}

.cvi-material-copy h2 {
  margin: 0 0 1.5rem;
  font-family: var(--cvi-serif);
  font-size: clamp(1.7rem, 3vw, 2.5rem);
  line-height: 1.45;
}

.cvi-material-copy__content {
  color: var(--cvi-ink-mid);
  font-size: 1rem;
  line-height: 2;
}

.cvi-material-copy__content > *:first-child {
  margin-top: 0;
}

.cvi-material-points {
  display: grid;
  gap: 0;
  margin: 2.4rem 0 0;
  padding: 0;
  border-top: 1px solid var(--cvi-line);
  list-style: none;
}

.cvi-material-points li {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 1rem;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--cvi-line);
  color: var(--cvi-ink-mid);
  line-height: 1.7;
}

.cvi-material-points span {
  color: var(--cvi-brand);
  font-family: var(--cvi-serif);
  font-size: 1.15rem;
  font-weight: 700;
}

.cvi-material-sidebar {
  position: sticky;
  top: 1.5rem;
}

.cvi-site-footer {
  padding: 3.5rem 0;
  color: var(--cvi-paper);
  background: var(--cvi-ink);
}

.cvi-site-footer__inner {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
}

.cvi-site-footer p {
  margin: 0;
  color: color-mix(in srgb, var(--cvi-paper) 65%, transparent);
  font-size: 0.72rem;
  line-height: 1.8;
}

.cvi-site-footer strong {
  display: block;
  margin-bottom: 0.55rem;
  color: var(--cvi-paper);
  font-family: var(--cvi-serif);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
}

.cvi-generic-main {
  min-height: 65vh;
  padding-block: 6rem;
}

.cvi-library-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(4.5rem, 9vw, 8rem) 0;
  border-bottom: 1px solid var(--cvi-line);
  background:
    radial-gradient(circle at 82% 36%, color-mix(in srgb, var(--cvi-brand) 14%, transparent), transparent 28rem),
    linear-gradient(180deg, var(--cvi-paper), var(--cvi-paper-soft));
}

.cvi-library-hero::after {
  content: "";
  position: absolute;
  right: 8vw;
  top: 50%;
  width: clamp(12rem, 26vw, 23rem);
  aspect-ratio: 1;
  border: 1px solid color-mix(in srgb, var(--cvi-brand) 24%, transparent);
  border-radius: 50%;
  transform: translateY(-50%);
  box-shadow:
    inset 0 0 0 clamp(2rem, 5vw, 5rem) color-mix(in srgb, var(--cvi-paper) 68%, transparent),
    inset 0 0 0 clamp(4rem, 10vw, 10rem) color-mix(in srgb, var(--cvi-brand) 5%, transparent);
}

.cvi-library-hero__inner {
  position: relative;
  z-index: 1;
}

.cvi-library-hero h1 {
  max-width: 10em;
  margin: 0;
  font-family: var(--cvi-serif);
  font-size: clamp(2.6rem, 6vw, 5.2rem);
  line-height: 1.2;
}

.cvi-library-hero__inner > p:last-child {
  max-width: 38rem;
  margin: 1.5rem 0 0;
  color: var(--cvi-ink-mid);
  font-size: clamp(1rem, 1.7vw, 1.15rem);
  line-height: 2;
}

.cvi-library-content {
  min-height: 48vh;
  padding-block: clamp(4.5rem, 8vw, 7.5rem);
}

.cvi-library-content__header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--cvi-line);
}

.cvi-library-content__header p,
.cvi-library-content__header h2 {
  margin-bottom: 0;
}

.cvi-library-content__header h2 {
  font-family: var(--cvi-serif);
  font-size: clamp(1.7rem, 3vw, 2.4rem);
}

.cvi-material-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.cvi-material-card {
  min-width: 0;
}

.cvi-material-card__visual {
  position: relative;
  display: flex;
  min-height: 22rem;
  flex-direction: column;
  justify-content: space-between;
  padding: 2rem;
  overflow: hidden;
  color: var(--cvi-paper);
  background: var(--cvi-ink);
  box-shadow: 10px 10px 0 var(--cvi-paper-deep);
  text-decoration: none;
}

.cvi-material-card__visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(145deg, transparent 43%, color-mix(in srgb, var(--cvi-brand) 88%, transparent) 43% 58%, transparent 58%),
    radial-gradient(circle at 80% 18%, transparent 0 3rem, color-mix(in srgb, var(--cvi-paper) 24%, transparent) 3.05rem 3.12rem, transparent 3.17rem);
}

.cvi-material-card__visual > * {
  position: relative;
  z-index: 1;
}

.cvi-material-card__visual img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cvi-material-card__visual--image {
  min-height: 0;
  padding: 0;
  background: var(--cvi-paper);
}

.cvi-material-card__visual--image::before {
  display: none;
}

.cvi-material-card__visual--image img {
  position: relative;
  inset: auto;
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
}

.cvi-material-card__brand,
.cvi-material-card__publisher {
  font-size: 0.6rem;
  letter-spacing: 0.16em;
}

.cvi-material-card__visual strong {
  margin-block: auto;
  font-family: var(--cvi-serif);
  font-size: clamp(1.25rem, 2.3vw, 1.8rem);
  line-height: 1.55;
}

.cvi-material-card__publisher {
  opacity: 0.7;
}

.cvi-material-card__body {
  padding: 1.8rem 0 0.5rem;
}

.cvi-material-card__body > p:first-child {
  margin: 0 0 0.8rem;
  color: var(--cvi-brand-deep);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.cvi-material-card h3 {
  margin: 0;
  font-family: var(--cvi-serif);
  font-size: clamp(1.2rem, 2vw, 1.55rem);
  line-height: 1.55;
}

.cvi-material-card h3 a,
.cvi-material-card__link {
  text-decoration: none;
}

.cvi-material-card h3 a:hover,
.cvi-material-card__link:hover {
  color: var(--cvi-brand-deep);
}

.cvi-material-card__excerpt {
  margin-top: 0.9rem;
  color: var(--cvi-ink-sub);
  font-size: 0.86rem;
  line-height: 1.85;
}

.cvi-material-card__excerpt p {
  margin: 0;
}

.cvi-material-card__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1.35rem;
  padding-top: 1rem;
  border-top: 1px solid var(--cvi-line);
  font-size: 0.78rem;
  font-weight: 700;
}

.cvi-library-empty {
  padding: 4rem;
  border: 1px solid var(--cvi-line);
  text-align: center;
}

.navigation.pagination {
  margin-top: 4rem;
}

.nav-links {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
}

.nav-links .page-numbers {
  min-width: 2.5rem;
  padding: 0.65rem;
  border: 1px solid var(--cvi-line);
  text-align: center;
  text-decoration: none;
}

.nav-links .current {
  color: var(--cvi-paper);
  background: var(--cvi-ink);
}

@media (max-width: 840px) {
  .cvi-material-hero__inner,
  .cvi-material-layout {
    grid-template-columns: 1fr;
  }

  .cvi-material-hero__inner {
    gap: 4rem;
  }

  .cvi-material-cover {
    width: min(78vw, 330px);
  }

  .cvi-material-sidebar {
    position: static;
  }

  .cvi-material-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .cvi-site-header__inner,
  .cvi-site-footer__inner,
  .cvi-material-hero__inner,
  .cvi-material-layout,
  .cvi-library-hero__inner,
  .cvi-library-content,
  .cvi-generic-main {
    width: min(100% - 28px, 1180px);
  }

  .cvi-site-header__inner {
    min-height: 72px;
  }

  .cvi-site-header__label {
    display: none;
  }

  .cvi-wordmark__mark {
    width: 32px;
    height: 32px;
  }

  .cvi-material-hero {
    padding-top: 3.6rem;
  }

  .cvi-library-hero::after {
    right: -5rem;
    opacity: 0.6;
  }

  .cvi-material-grid {
    grid-template-columns: 1fr;
  }

  .cvi-material-card__visual {
    min-height: 24rem;
  }

  .cvi-material-card__visual--image {
    min-height: 0;
  }

  .cvi-site-footer__inner {
    align-items: start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}