@charset "UTF-8";

/* =========================================================
   立正大学学園 寄附ページ
   HTML/CSS分離・レスポンシブ対応版
   ========================================================= */

:root {
  --color-main: #008BBF;
  --color-main-bright: #00A3E0;
  --color-main-deep: #2A6F83;
  --color-main-soft: #F7FCFE;
  --color-accent: #C8A96A;
  --color-text: #1f2937;
  --color-heading: #111827;
  --color-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-white: #ffffff;
  --shadow-soft: 0 14px 34px rgba(0, 0, 0, 0.05);
  --shadow-card: 0 20px 42px rgba(0, 0, 0, 0.08);
  --radius-lg: 30px;
  --radius-xl: 40px;
  --content-width: 1200px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Hiragino Sans", "Yu Gothic UI", sans-serif;
  color: var(--color-text);
  background: var(--color-white);
  line-height: 1.7;
}

a {
  color: inherit;
}

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

.site-container {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section-label {
  font-size: 12px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-main);
}

.section-title {
  margin: 18px 0 0;
  font-size: clamp(32px, 4vw, 42px);
  line-height: 1.35;
  color: var(--color-heading);
}

/* =========================================================
   Header
   ========================================================= */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
}

.site-header__inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  align-content: center;
  gap: 24px;
}

.site-header__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-main);
  white-space: nowrap;
}

.site-header__nav {
  display: flex;
  gap: 18px;
  align-items: center;
  flex-wrap: wrap;
  align-content: center;
  margin-left: auto;
}

.site-header__link {
  text-decoration: none;
  color: var(--color-main);
  font-size: 14px;
}

.site-header__button {
  padding: 10px 16px;
  border-radius: 12px;
  background: var(--color-main);
  color: #fff;
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
}

/* =========================================================
   First View
   ========================================================= */

.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #2A6F83 0%, #00A3E0 48%, #3D7D91 100%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.08;
  background-image:
    linear-gradient(rgba(255,255,255,0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.16) 1px, transparent 1px);
  background-size: 44px 44px;
}

.hero__light {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 14% 18%, rgba(255,255,255,0.26), transparent 24%),
    radial-gradient(circle at 84% 20%, rgba(255,255,255,0.18), transparent 22%),
    radial-gradient(circle at 72% 82%, rgba(255,255,255,0.12), transparent 24%);
}

.hero__air {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(255,255,255,0.08) 0%,
    rgba(255,255,255,0.03) 42%,
    rgba(0,0,0,0.04) 100%
  );
}

.hero__gloss {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    120deg,
    rgba(255,255,255,0.00) 0%,
    rgba(255,255,255,0.12) 18%,
    rgba(255,255,255,0.00) 36%,
    rgba(255,255,255,0.08) 52%,
    rgba(255,255,255,0.00) 72%
  );
  mix-blend-mode: screen;
  opacity: 0.72;
  pointer-events: none;
}

.hero__inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 56px 24px 86px;
  position: relative;
  z-index: 1;
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 18px;
}

.hero-tile {
  aspect-ratio: 1;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.22);
  box-shadow: var(--shadow-card);
}

.hero-tile--text {
  background: rgba(255,255,255,0.16);
  border: 1px solid rgba(255,255,255,0.24);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.20),
    0 20px 42px rgba(0,0,0,0.08);
  padding: 18px;
  color: #fff;
  display: grid;
  align-content: center;
  backdrop-filter: blur(10px);
}

.hero-tile--wide {
  grid-column: span 2;
  min-height: 168px;
  aspect-ratio: auto;
  border-radius: 34px;
  background: rgba(255,255,255,0.18);
  border: 1px solid rgba(255,255,255,0.26);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.22),
    0 22px 46px rgba(0,0,0,0.08);
  padding: 28px;
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: center;/*align-content: center;*/
  backdrop-filter: blur(12px);
}

.hero-tile--school {
  background: rgba(255,255,255,0.16);
  justify-content: center;/*align-content: center;*/
  padding: 26px;
}

.hero-tile__label {
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.78);
}

.hero-tile__label--wide {
  font-size: 12px;
  letter-spacing: 0.20em;
  color: rgba(255,255,255,0.82);
}

.hero-tile__title {
  margin-top: 8px;
  font-size: 21px;
  font-weight: 700;
  line-height: 1.40;
  text-shadow: 0 2px 10px rgba(0,0,0,0.10);
}

.hero-tile__title--large {
  font-size: 34px;
  line-height: 1.38;
  letter-spacing: 0.01em;
  text-shadow: 0 2px 12px rgba(0,0,0,0.10);
}

.hero-tile__text {
  margin-top : 0.75rem;/*12px;*/
  font-size  : 1rem;/*13px;*/
  line-height: 1.85;/*1.8;*/
  color      : rgba(255,255,255,0.90);
}

.hero-tile__text--large {
  margin-top: 0.75rem;/*12px;*/
  max-width: 26.875rem;/*430px;*/
  font-size: 1.02rem;/*14px;*/
  line-height: 1.9;
}

.slide-box {
  position: relative;
  aspect-ratio: 1;
}

.slide-layer {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 1.4s ease;
  background-size: cover;
  background-position: center;
}

.slide-layer.current {
  opacity: 1;
}

/* =========================================================
   Greeting
   ========================================================= */

.greeting {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 92px 24px 76px;
}

.greeting__heading {
  text-align: center;
  margin-bottom: 34px;
}

.greeting__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  align-items: stretch;
}

.greeting-card {
  background: #fff;
  border: 1px solid rgba(0,0,0,0.05);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 14px 32px rgba(0,0,0,0.06);
  display: flex;
  flex-direction: column;
}

.greeting-card__image {
  aspect-ratio: 4 / 3;
  background-size: cover;
  background-position: center;
}

.greeting-card__body {
  padding: 28px;
}

.greeting-card__role {
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-main);
}

.greeting-card__title {
  margin: 12px 0 0;
  font-size: 26px;
  line-height: 1.4;
  color: var(--color-heading);
}

.greeting-card__subtitle {
  margin-top: 8px;
  font-size: 14px;
  color: var(--color-muted);
}

.greeting-card__text {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 2;
  color: #4b5563;
}

/* =========================================================
   Donation Types
   ========================================================= */

.donation-types {
  background: var(--color-main-soft);
  padding: 82px 0;
  border-top: 1px solid #f1f5f9;
  border-bottom: 1px solid #f1f5f9;
}

.donation-types__heading {
  text-align: center;
}

.donation-types__list {
  margin-top: 34px;
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: flex-start;
  align-items: stretch;
}

.donation-card {
  flex: 0 0 calc((100% - 40px) / 3);
  max-width: calc((100% - 40px) / 3);
  background: #fff;
  border-radius: 28px;
  padding: 30px;
  border: 1px solid rgba(0,0,0,0.05);
  box-shadow: var(--shadow-soft);
}

.donation-card__number {
  width: 48px;
  height: 48px;
  border-radius: 16px;
  background: var(--color-main);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.donation-card__number--accent {
  background: var(--color-accent);
}

.donation-card__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 1rem;
}

.donation-card__category {
  font-size: 1rem;/*0.78rem;*/
  font-weight: 700;
  letter-spacing: 0.04em;
  color: rgba(40, 52, 62, 0.72);
}

/* 学園（現行ブルー） */
.donation-card__number--school {
  background: var(--color-main);
}

/* 大学（深緑） */
.donation-card__number--university {
  background: rgb(44,106,72);
}

/* 中高（明るい緑） */
.donation-card__number--juniorhigh {
  background: rgb(102,192,60);
}

/* その他 */
.donation-card__number-others {
  background: var(--color-accent);
}

.donation-card__title {
  margin: 18px 0 0;
  font-size: 24px;
  line-height: 1.5;
  color: var(--color-heading);
}

.donation-card__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--color-muted);
}

/* =========================================================
   Flow
   ========================================================= */

.flow {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 92px 24px;
}

.flow__layout {
  /*display: flex;*/
  /*flex-wrap: wrap;*/
  /*gap: 28px;*/
  /*align-items: stretch;*/
  max-width: 920px;
  margin: 0 auto;
  background: rgba(255,255,255,0.72);
  border: 1px solid rgba(0,163,224,0.10);
  border-radius: 32px;
  padding: 48px;
  box-shadow:
    0 18px 40px rgba(0,0,0,0.05),
    inset 0 1px 0 rgba(255,255,255,0.7);
  backdrop-filter: blur(8px);
}

.flow__main {
  /*flex: 1 1 680px;*/
  /*min-width: 320px;*/
}

.flow__steps {
  margin-top: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.flow-step {
  background: #fff;
  border: 1px solid rgba(0,0,0,0.05);
  border-radius: 24px;
  padding: 24px;
  box-shadow: 0 12px 30px rgba(0,0,0,0.05);
  display: flex;
  gap: 16px;
}

.flow-step__number {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-main);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
}

.flow-step__number--accent {
  background: var(--color-accent);
}

.flow-step__title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-heading);
}

.flow-step__text {
  margin-top: 6px;
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.9;
}

.guide-card {
  flex: 1 1 360px;
  min-width: 320px;
  background: linear-gradient(135deg, var(--color-main) 0%, var(--color-main-deep) 100%);
  border-radius: var(--radius-lg);
  padding: 32px;
  color: #fff;
  position: relative;
  overflow: hidden;
  box-shadow: 0 18px 44px rgba(0,163,224,0.18);
}

.guide-card::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.18;
  background:
    radial-gradient(circle at top right, rgba(255,255,255,0.28), transparent 28%),
    radial-gradient(circle at bottom left, rgba(255,255,255,0.18), transparent 24%);
}

.guide-card__inner {
  position: relative;
  z-index: 1;
}

.guide-card__label {
  font-size: 12px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.70);
}

.guide-card__title {
  margin: 18px 0 0;
  font-size: 34px;
  line-height: 1.45;
  color: #fff;
}

.guide-card__text {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 2;
  color: rgba(255,255,255,0.84);
}

.guide-card__links {
  margin-top: 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.guide-card__link {
  padding: 14px 16px;
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,0.16);
  background: rgba(255,255,255,0.08);
  backdrop-filter: blur(8px);
}

/* =========================================================
   CTA
   ========================================================= */

.cta {
  padding: 0 24px 56px;
}

.cta__inner {
  max-width: var(--content-width);
  margin: 0 auto;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-main) 0%, var(--color-main-deep) 100%);
  position: relative;
  box-shadow: 0 22px 54px rgba(0,163,224,0.16);
}

.cta__inner::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.20;
  background:
    radial-gradient(circle at 10% 20%, rgba(255,255,255,0.28), transparent 20%),
    radial-gradient(circle at 90% 82%, rgba(255,255,255,0.18), transparent 24%);
}

.cta__content {
  position: relative;
  z-index: 1;
  padding: 72px 32px;
  text-align: center;
  color: #fff;
}

.cta__label {
  font-size: 12px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.70);
}

.cta__title {
  margin: 18px 0 0;
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1.35;
}

.cta__text {
  margin: 24px auto 0;
  max-width: 760px;
  font-size: 15px;
  line-height: 2;
  color: rgba(255,255,255,0.82);
}

.cta__buttons {
  margin-top: 34px;
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

.cta__button {
  display: inline-block;
  padding: 15px 28px;
  border-radius: 16px;
  background: #fff;
  color: var(--color-main);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
}

.cta__button--accent {
  background: var(--color-accent);
  color: #fff;
}

/* =========================================================
   Footer
   ========================================================= */

.site-footer {
  background: var(--color-main-soft);
  border-top: 1px solid var(--color-border);
}

.site-footer__inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 30px 24px 38px;
}

.site-footer__title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-main);
}

.site-footer__address {
  margin-top: 12px;
  font-size: 14px;
  line-height: 2;
  color: #4b5563;
}

.site-footer__links {
  margin-top: 14px;
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.site-footer__link {
  text-decoration: none;
  color: var(--color-main);
  font-size: 14px;
}

.site-footer__inner {
  display: flex;
  justify-content: space-between;
  gap: 48px;
}

.site-footer__schools {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-end;
  justify-content: center;
}

.site-footer__school-link {
  color: rgba(40,92,79,0.78);
  text-decoration: none;
  font-size: 0.95rem;
  transition: opacity 0.3s ease;
}

.site-footer__school-link:hover {
  opacity: 0.7;
}

/* =========================================================
   Responsive
   ========================================================= */

@media (max-width: 1024px) {
  .site-header__inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-header__nav {
    justify-content: flex-start;
  }

  .hero-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .hero-tile--wide {
    grid-column: span 2;
  }

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

  .donation-card {
    flex-basis: calc((100% - 20px) / 2);
    max-width: calc((100% - 20px) / 2);
  }
}

@media (max-width: 768px) {
  .site-container,
  .hero__inner,
  .greeting,
  .flow,
  .site-footer__inner {
    padding-left: 18px;
    padding-right: 18px;
  }
  
  .site-footer__inner {
    flex-direction: column;
  }

  .site-footer__schools {
    align-items: center;
    text-align: center;
    margin-top: 1rem;
  }

  .hero__inner {
    padding-top: 42px;
    padding-bottom: 56px;
  }

  /* ファーストビューは15マス相当の設計を維持するため、
     タブレット・スマホでも3列×5行を基本にします。 */
  .hero-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
  }

  .hero-tile,
  .hero-tile--text {
    border-radius: 22px;
  }

  .hero-tile--wide,
  .hero-tile--school {
    grid-column: span 2;
    aspect-ratio: 2 / 1;
    min-height: 0;
    border-radius: 26px;
    padding: 18px;
  }

  .hero-tile__title {
    font-size : 16px;
    line-height: 1.35;
  }

  .hero-tile__title--large {
    font-size: 24px;
    line-height: 1.3;
  }

  .hero-tile__text,
  .hero-tile__text--large {
    font-size  : 0.9rem;/*12px;*/
    line-height: 1.7;/*1.65;*/
  }

  .greeting,
  .flow,
  .donation-types {
    padding-top: 64px;
    padding-bottom: 56px;
  }

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

  .flow__layout {
    flex-direction: column;
  }

  .flow__main,
  .guide-card {
    min-width: 0;
  }

  .donation-card {
    flex-basis: 100%;
    max-width: 100%;
  }

  .cta {
    padding-left: 18px;
    padding-right: 18px;
  }

  .cta__content {
    padding: 52px 22px;
  }
}

@media (max-width: 520px) {
  .site-header__inner {
    align-items: center;
    text-align: center;
  }

  .site-header__title {
    font-size: 17px;
    white-space: normal;
    width: 100%;
    text-align: center;
  }

  .site-header__nav {
    gap: 10px 14px;
    width: 100%;
    justify-content: center;
  }

  .site-header__link {
    font-size: 13px;
  }

  .hero__inner {
    padding-top: 34px;
    padding-bottom: 44px;
  }

  .hero-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
  }

  .hero-tile,
  .hero-tile--text {
    border-radius: 16px;
  }

  .hero-tile--text {
    padding: 10px;
  }

  .hero-tile--wide,
  .hero-tile--school {
    grid-column: span 2;
    aspect-ratio: 2 / 1;
    min-height: 0;
    border-radius: 18px;
    padding: 12px;
  }

  .slide-box {
    aspect-ratio: 1;
  }

  .hero-tile__label,
  .hero-tile__label--wide {
    font-size: 9px;
    letter-spacing: 0.12em;
  }

  .hero-tile__title {
    margin-top: 4px;
    font-size: 12px;
    line-height: 1.28;
  }

  .hero-tile__title--large {
    font-size: 17px;
    line-height: 1.25;
  }

  .hero-tile__text,
  .hero-tile__text--large {
    margin-top : 0.4rem;/*6px;*/
    font-size  : 0.82rem;/*10px;*/
    line-height: 1.5;/*1.45;*/
  }

  .flow-step {
    flex-direction: column;
  }

  .guide-card {
    padding: 26px;
  }
}