@charset "UTF-8";
/* =========================================================================
   sql.css — SQL学習講座 専用スタイル
   トーン：近未来のデータベース世界。深い闇色 + ネオンシアン/エメラルド。
   配置 ：/sql/sql.css
   依存 ：/styles.css （共通リセット・.container・.to-top）
   注意 ：ダークモード専用（ライト切替なし）。ccna.css のようなテーマ変数
          切り替えは行わず、最初からダーク値のみで構成する。
   ========================================================================= */

/* ------------------------------
   0. ダーク専用ガード
   ------------------------------ */
.sql-body, .sql-body * {
  color-scheme: dark;
}

/* ------------------------------
   1. CSS Variables
   ------------------------------ */
.sql-body {
  /* ベース背景 */
  --sql-bg-deep:        #04060c;
  --sql-bg:             #070b14;
  --sql-bg-tint:        #0a0f1a;
  --sql-bg-panel:       #0d1420;
  --sql-border:         #1b2536;
  --sql-border-strong:  #2a3a52;

  /* 文字色 */
  --sql-ink:            #e6edf5;
  --sql-ink-soft:       #b7c4d6;
  --sql-ink-muted:      #8496ac;
  --sql-ink-faint:      #5b6b81;

  /* アクセント：ネオンシアン + エメラルド */
  --sql-cyan:           #22d3ee;
  --sql-cyan-strong:    #67e8f9;
  --sql-cyan-bg:        rgba(34, 211, 238, 0.12);
  --sql-cyan-bg-soft:   rgba(34, 211, 238, 0.06);
  --sql-emerald:        #34d399;
  --sql-emerald-strong: #6ee7b7;
  --sql-emerald-bg:     rgba(52, 211, 153, 0.12);
  --sql-amber:          #fbbf24;
  --sql-violet:         #a78bfa;

  /* グラデーション */
  --sql-gradient-hero: radial-gradient(ellipse 70% 55% at 20% 0%, rgba(34,211,238,0.14), transparent 60%),
                       radial-gradient(ellipse 60% 45% at 88% 20%, rgba(52,211,153,0.10), transparent 60%),
                       linear-gradient(180deg, #05070f 0%, #070b16 55%, #060a12 100%);
  --sql-gradient-cta:  linear-gradient(120deg, #0891b2 0%, #22d3ee 55%, #34d399 100%);

  /* シャドウ（暗背景向け・シアングロー付き） */
  --sql-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4), 0 1px 3px rgba(0, 0, 0, 0.3);
  --sql-shadow-md: 0 10px 26px rgba(0, 0, 0, 0.45), 0 0 26px rgba(34, 211, 238, 0.08);
  --sql-shadow-lg: 0 22px 52px rgba(0, 0, 0, 0.55), 0 0 44px rgba(34, 211, 238, 0.14);

  /* タイポ */
  --sql-font-jp:   'Noto Sans JP', sans-serif;
  --sql-font-mono: 'JetBrains Mono', 'Courier New', monospace;

  /* レイアウト */
  --sql-radius-sm: 8px;
  --sql-radius-md: 14px;
  --sql-radius-lg: 20px;

  position: relative;
  background:
    radial-gradient(ellipse 60% 40% at 12% 0%, rgba(34, 211, 238, 0.09), transparent 60%),
    radial-gradient(ellipse 50% 35% at 92% 10%, rgba(52, 211, 153, 0.07), transparent 60%),
    linear-gradient(180deg, var(--sql-bg-deep) 0%, var(--sql-bg) 40%, var(--sql-bg-deep) 100%);
  color: var(--sql-ink);
  font-family: var(--sql-font-jp);
  -webkit-font-smoothing: antialiased;
  line-height: 1.8;
  isolation: isolate;
}

/* 薄いグリッド線（データベース世界の質感） */
.sql-body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(103, 232, 249, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(103, 232, 249, 0.045) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 0%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 0%, transparent 75%);
}

.sql-body .sql-narrow {
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================================
   サイト共通ヘッダー/フッターのダーク上書き
   partials/header.php, footer.php はそのまま利用しつつ、
   高詳細度セレクタで近未来ダーク配色に上書きする。
   ============================================================ */
body.sql-body .site-header,
body.sql-body .site-footer {
  font-family: var(--sql-font-jp);
}
body.sql-body .site-header {
  background: rgba(4, 6, 12, 0.92);
  border-bottom: 1px solid var(--sql-border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
body.sql-body .brand img {
  filter: drop-shadow(0 0 6px rgba(103, 232, 249, 0.35));
}
body.sql-body .brand-fallback {
  background: var(--sql-gradient-cta);
  color: #04060c;
}
body.sql-body .site-catch {
  color: var(--sql-ink-muted);
}
body.sql-body .site-catch strong {
  color: var(--sql-cyan-strong);
}
body.sql-body .btn-h {
  border-color: var(--sql-border-strong);
}
body.sql-body .btn-h.ghost {
  color: var(--sql-ink);
  background: transparent;
}
body.sql-body .btn-h.ghost:hover {
  border-color: var(--sql-cyan);
  color: var(--sql-cyan-strong);
}
body.sql-body .btn-h.solid {
  background: var(--sql-gradient-cta);
  border-color: transparent;
  color: #04060c;
}
body.sql-body .btn-h.solid:hover {
  filter: brightness(1.08);
}
body.sql-body .site-footer {
  background: rgba(4, 6, 12, 0.92);
  border-top: 1px solid var(--sql-border);
}
body.sql-body .footer-inner {
  color: var(--sql-ink-faint);
}
body.sql-body .footer-copy {
  color: var(--sql-ink-faint);
}
body.sql-body .footer-links a {
  color: var(--sql-ink-muted);
}
body.sql-body .footer-links a:hover {
  color: var(--sql-cyan-strong);
}

/* to-top ボタン（/styles.css 由来）もダークに揃える */
body.sql-body .to-top {
  border-color: var(--sql-border-strong);
  background: var(--sql-bg-panel);
  color: var(--sql-cyan-strong);
}
body.sql-body .to-top:hover {
  background: var(--sql-gradient-cta);
  color: #04060c;
  border-color: transparent;
}

/* ------------------------------
   2. セクション共通
   ------------------------------ */
.sql-section-head {
  text-align: center;
  margin-bottom: 56px;
}
.sql-section-label {
  display: inline-block;
  font-family: var(--sql-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--sql-cyan-strong);
  background: var(--sql-cyan-bg-soft);
  border: 1px solid rgba(34, 211, 238, 0.25);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 20px;
}
.sql-section-title {
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  font-weight: 700;
  line-height: 1.45;
  color: var(--sql-ink);
  letter-spacing: 0.02em;
  margin: 0 0 18px;
}
.sql-section-sub {
  font-size: 0.98rem;
  color: var(--sql-ink-soft);
  line-height: 1.9;
  max-width: 640px;
  margin: 0 auto;
}

/* ------------------------------
   3. ボタン
   ------------------------------ */
.sql-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 999px;
  font-size: 0.94rem;
  font-weight: 500;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  border: 1.5px solid transparent;
  cursor: pointer;
}
.sql-btn-primary {
  background: var(--sql-gradient-cta);
  color: #04060c;
  box-shadow: var(--sql-shadow-md);
}
.sql-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--sql-shadow-lg);
  filter: brightness(1.06);
  color: #04060c;
}
.sql-btn-ghost {
  background: rgba(255, 255, 255, 0.02);
  color: var(--sql-cyan-strong);
  border-color: var(--sql-border-strong);
}
.sql-btn-ghost:hover {
  background: var(--sql-cyan-bg-soft);
  border-color: var(--sql-cyan);
  color: var(--sql-cyan-strong);
}

/* ------------------------------
   4. HERO
   ------------------------------ */
.sql-hero {
  position: relative;
  padding: 76px 0 74px;
  background: var(--sql-gradient-hero);
  border-bottom: 1px solid var(--sql-border);
  overflow: hidden;
}
.sql-hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.85;
}
.sql-hero-schema {
  width: 100%;
  height: 100%;
}
.sql-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.7fr 1fr;
  gap: 60px;
  align-items: center;
}
.sql-hero-text {
  min-width: 0;
}
.sql-kicker {
  font-family: var(--sql-font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  color: var(--sql-cyan-strong);
  margin-bottom: 18px;
  text-transform: uppercase;
}
.sql-hero-title {
  font-size: clamp(2rem, 5vw, 3.3rem);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.02em;
  color: var(--sql-ink);
  margin: 0 0 28px;
}
.sql-hero-accent {
  background: linear-gradient(120deg, var(--sql-cyan) 0%, var(--sql-emerald) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.sql-hero-lead {
  font-size: 0.98rem;
  line-height: 1.9;
  color: var(--sql-ink-soft);
  margin: 0 0 30px;
}
.sql-hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* マスコットエリア（ゆみちゃん） */
.sql-hero-mascot {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.sql-hero-mascot-frame {
  position: relative;
  width: 100%;
  max-width: 160px;
  aspect-ratio: 1/1;
  border-radius: var(--sql-radius-lg);
  overflow: hidden;
  background: rgba(10, 15, 26, 0.65);
  border: 1px solid rgba(34, 211, 238, 0.3);
  box-shadow: var(--sql-shadow-lg);
  backdrop-filter: blur(6px);
}
.sql-hero-mascot-frame img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  padding: 12px;
}
.sql-hero-mascot-placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 8px;
  background:
    radial-gradient(circle at 30% 30%, rgba(34, 211, 238, 0.25), transparent 60%),
    radial-gradient(circle at 70% 80%, rgba(52, 211, 153, 0.2), transparent 55%),
    linear-gradient(135deg, #0a0f1a, #0d1626);
}
.sql-hero-mascot-placeholder-label {
  font-family: var(--sql-font-mono);
  font-size: 2.6rem;
  letter-spacing: 0.08em;
  color: var(--sql-cyan-strong);
}
.sql-hero-mascot-placeholder-sub {
  font-family: var(--sql-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--sql-cyan);
  text-transform: uppercase;
}
.sql-hero-mascot-caption {
  font-family: var(--sql-font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--sql-ink-muted);
  text-transform: uppercase;
}

/* ------------------------------
   5. GAMES — SQL DIVER
   ------------------------------ */
.sql-games {
  padding: 90px 0;
  background: var(--sql-bg);
  border-bottom: 1px solid var(--sql-border);
  position: relative;
}
.sql-game-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  max-width: 780px;
  margin: 0 auto;
}
.sql-game-card {
  position: relative;
  display: block;
  background: linear-gradient(180deg, rgba(13, 20, 32, 0.9), rgba(7, 11, 20, 0.92));
  border: 1px solid var(--sql-border-strong);
  border-radius: var(--sql-radius-lg);
  padding: 36px 38px 38px;
  box-shadow: var(--sql-shadow-md);
  text-decoration: none;
  color: inherit;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.sql-game-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--sql-gradient-cta);
}
.sql-game-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--sql-shadow-lg);
  border-color: var(--sql-cyan);
}
.sql-game-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}
.sql-game-tag {
  font-family: var(--sql-font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--sql-cyan-strong);
  text-transform: uppercase;
}
.sql-game-status {
  font-family: var(--sql-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(52, 211, 153, 0.16);
  color: var(--sql-emerald-strong);
}
.sql-game-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--sql-ink);
  margin: 0 0 14px;
  line-height: 1.5;
  letter-spacing: 0.02em;
}
.sql-game-desc {
  font-size: 0.97rem;
  line-height: 1.95;
  color: var(--sql-ink-soft);
  margin: 0 0 24px;
}
.sql-game-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--sql-cyan-strong);
  padding: 11px 20px;
  border: 1.5px solid var(--sql-cyan);
  border-radius: 999px;
  transition: background 0.2s ease, color 0.2s ease;
}
.sql-game-card:hover .sql-game-cta {
  background: var(--sql-gradient-cta);
  color: #04060c;
  border-color: transparent;
}
.sql-game-cta svg {
  transition: transform 0.25s ease;
}
.sql-game-card:hover .sql-game-cta svg {
  transform: translateX(3px);
}

/* ------------------------------
   6. ROADMAP
   ------------------------------ */
.sql-roadmap {
  padding: 100px 0;
  background: var(--sql-bg-tint);
  border-bottom: 1px solid var(--sql-border);
  position: relative;
}
.sql-roadmap-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 920px;
  margin: 0 auto;
}
.sql-stage {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 24px;
  position: relative;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.sql-stage.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.sql-stage + .sql-stage {
  margin-top: 32px;
}

.sql-stage-marker {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.sql-stage-num {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--sql-bg-panel);
  border: 2px solid var(--sql-cyan);
  color: var(--sql-cyan-strong);
  font-family: var(--sql-font-mono);
  font-size: 1.3rem;
  letter-spacing: 0.04em;
  box-shadow: 0 0 0 6px rgba(34, 211, 238, 0.1), 0 0 18px rgba(34, 211, 238, 0.2);
  z-index: 1;
  flex-shrink: 0;
}
.sql-stage-line {
  flex-grow: 1;
  width: 2px;
  background: linear-gradient(to bottom, var(--sql-cyan), var(--sql-emerald));
  margin-top: 8px;
  border-radius: 2px;
  opacity: 0.6;
}
.sql-stage-line-end {
  background: linear-gradient(to bottom, var(--sql-cyan), transparent);
}

.sql-stage-card {
  background: var(--sql-bg-panel);
  border: 1px solid var(--sql-border);
  border-radius: var(--sql-radius-md);
  padding: 28px 30px 30px;
  box-shadow: var(--sql-shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  text-decoration: none;
  color: inherit;
  display: block;
}
.sql-stage-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--sql-shadow-md);
  border-color: var(--sql-cyan);
}
.sql-stage-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}
.sql-stage-tag {
  font-family: var(--sql-font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  color: var(--sql-cyan-strong);
  text-transform: uppercase;
}
.sql-stage-status {
  font-family: var(--sql-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(52, 211, 153, 0.16);
  color: var(--sql-emerald-strong);
}
.sql-stage-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--sql-ink);
  margin: 0 0 12px;
  line-height: 1.5;
  letter-spacing: 0.02em;
}
.sql-stage-desc {
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--sql-ink-soft);
  margin: 0 0 18px;
}
.sql-stage-topics {
  list-style: none;
  margin: 0;
  padding: 16px 18px;
  background: var(--sql-cyan-bg-soft);
  border: 1px solid rgba(34, 211, 238, 0.14);
  border-radius: var(--sql-radius-sm);
  display: grid;
  gap: 6px;
}
.sql-stage-topics li {
  position: relative;
  padding-left: 18px;
  font-size: 0.88rem;
  color: var(--sql-ink-soft);
  line-height: 1.7;
}
.sql-stage-topics li::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 0.7em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--sql-cyan);
  box-shadow: 0 0 6px rgba(34, 211, 238, 0.6);
}

/* ------------------------------
   7. WHAT IS SQL
   ------------------------------ */
.sql-what {
  padding: 100px 0;
  background: var(--sql-bg);
}
.sql-what-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.sql-what-card {
  background: var(--sql-bg-panel);
  border: 1px solid var(--sql-border);
  border-radius: var(--sql-radius-md);
  padding: 32px 28px;
  position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.sql-what-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--sql-shadow-md);
  border-color: var(--sql-cyan);
}
.sql-what-card-num {
  font-family: var(--sql-font-mono);
  font-size: 1.6rem;
  color: var(--sql-cyan);
  margin-bottom: 12px;
  letter-spacing: 0.04em;
}
.sql-what-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--sql-ink);
  margin: 0 0 12px;
  line-height: 1.5;
}
.sql-what-card-text {
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--sql-ink-soft);
  margin: 0;
}
.sql-what-card-text strong {
  color: var(--sql-cyan-strong);
  font-weight: 700;
}

/* ------------------------------
   8. ABOUT
   ------------------------------ */
.sql-about {
  padding: 100px 0 110px;
  background: var(--sql-bg-tint);
}
.sql-about-text p {
  font-size: 1rem;
  line-height: 2;
  color: var(--sql-ink-soft);
  margin: 0 0 1.4em;
}
.sql-about-text p:last-child { margin-bottom: 0; }
.sql-about-text strong {
  color: var(--sql-ink);
  font-weight: 700;
  background: linear-gradient(transparent 65%, rgba(34, 211, 238, 0.22) 65%);
  padding: 0 2px;
}
.sql-about-text em {
  font-style: normal;
  color: var(--sql-emerald-strong);
  font-weight: 500;
}
.sql-inline-link {
  color: var(--sql-cyan-strong);
  text-decoration: none;
  border-bottom: 1px solid var(--sql-cyan);
  padding-bottom: 1px;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.sql-inline-link:hover {
  color: var(--sql-emerald-strong);
  border-bottom-color: var(--sql-emerald);
}

.sql-target {
  margin-top: 36px;
  padding: 26px 28px;
  background: rgba(34, 211, 238, 0.05);
  border: 1px solid rgba(34, 211, 238, 0.25);
  border-left: 4px solid var(--sql-cyan);
  border-radius: var(--sql-radius-md);
}
.sql-target-label {
  font-family: var(--sql-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--sql-cyan-strong);
  margin-bottom: 14px;
  text-transform: uppercase;
}
.sql-target-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.sql-target-list li {
  position: relative;
  padding-left: 24px;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--sql-ink-soft);
}
.sql-target-list li::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 0.65em;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--sql-emerald);
  box-shadow: 0 0 0 3px rgba(52, 211, 153, 0.2);
}

/* ------------------------------
   9. レスポンシブ
   ------------------------------ */
@media (max-width: 960px) {
  .sql-hero { padding: 60px 0 60px; }
  .sql-hero-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .sql-hero-mascot { order: -1; }
  .sql-hero-mascot-frame { max-width: 180px; }
  .sql-what-grid { grid-template-columns: 1fr; gap: 12px; }
}

@media (max-width: 760px) {
  .sql-game-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .sql-hero { padding: 50px 0 50px; }
  .sql-games,
  .sql-roadmap,
  .sql-what,
  .sql-about { padding: 70px 0; }
  .sql-section-head { margin-bottom: 40px; }

  .sql-game-card { padding: 24px 22px 26px; }
  .sql-game-title { font-size: 1.3rem; }

  .sql-what-card {
    display: grid;
    grid-template-columns: 48px 1fr;
    gap: 16px;
    padding: 22px 22px;
    align-items: start;
  }
  .sql-what-card-num { font-size: 1.5rem; margin-bottom: 0; line-height: 1; padding-top: 4px; }
  .sql-what-card-title { grid-column: 2; font-size: 1rem; margin-bottom: 8px; }
  .sql-what-card-text { grid-column: 2; font-size: 0.88rem; line-height: 1.8; }

  .sql-stage { grid-template-columns: 56px 1fr; gap: 16px; }
  .sql-stage-num { width: 44px; height: 44px; font-size: 1.05rem; }
  .sql-stage-card { padding: 22px 20px; }
  .sql-stage-title { font-size: 1.2rem; }

  .sql-target { padding: 20px 22px; }
  .sql-target-list li { font-size: 0.9rem; }

  .sql-btn { padding: 11px 20px; font-size: 0.9rem; }
}