/* ==========================================================
   ラック実装ページ（rack.html）専用のデザイン
   ----------------------------------------------------------
   共通の色・ヘッダー・フッター・ボタンは style.css を使い、
   このファイルでは rack.html だけの見せ方を定義しています。
   クラス名はすべて「rk-」で始まるので、ほかのページには影響しません。
   ========================================================== */
:root {
  --rk-u: 22px;            /* ラック1U分の高さ（画面上） */
  --rk-frame: #1b2330;     /* ラックの枠 */
  --rk-rail: #3a4658;      /* 左右の支柱（レール） */
  --rk-bay: #0f151e;       /* ラック内部の暗い背景 */
  --rk-pick: #4fc3f7;      /* 選んだ機器の枠 */
  --rk-rule: #d6e2f0;
  --rk-bad: #c0504d;       /* 整理前 */
  --rk-good: #2e7d4f;      /* 整理後 */
}

.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.rk-hero__lead, .rk-head p, .rk-note p, .rk-jobs dd, .rk-pair p, .rk-steps p { word-break: auto-phrase; }

/* ---------- ページ上部：見出し＋ラック実装図 ---------- */
.rk-hero { background: var(--sky); border-bottom: 1px solid var(--rk-rule); }
.rk-hero__inner { display: grid; grid-template-columns: .8fr 1.2fr; gap: 48px; align-items: center; padding-top: 56px; padding-bottom: 60px; }
.rk-hero h1 { font-size: clamp(30px, 4.8vw, 46px); font-weight: 900; color: var(--navy); line-height: 1.3; }
.rk-hero__lead { margin-top: 18px; font-size: clamp(16px, 2vw, 18px); max-width: 28em; }
.rk-hero__meta { list-style: none; margin: 14px 0 0; padding: 0; font-size: 14px; color: var(--muted); line-height: 1.7; }
.rk-hero__meta span { white-space: nowrap; }
.rk-hero__cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

/* ラック実装図と説明 */
.rk-plan { margin: 0; display: grid; grid-template-columns: minmax(0, 330px) minmax(0, 1fr); gap: 24px; align-items: start; }
.rk-plan__cap { grid-column: 1 / -1; display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; align-items: baseline; }
.rk-plan__cap b { color: var(--navy); font-size: 15px; }
.rk-plan__cap span { font-size: 12px; color: var(--muted); }

.rk-rack {
  display: grid; grid-template-columns: 30px 12px minmax(0, 1fr) 12px;
  grid-template-rows: repeat(24, var(--rk-u));
  background: var(--rk-frame); padding: 12px 10px 12px 4px; border-radius: 6px;
  box-shadow: 0 18px 40px rgba(11, 42, 91, .22);
}
.rk-u { grid-column: 1; font-size: 10px; color: #8193a8; text-align: right; padding-right: 6px; line-height: var(--rk-u); font-variant-numeric: tabular-nums; }
.rk-rail {
  grid-row: 1 / -1;
  background:
    repeating-linear-gradient(180deg, transparent 0 4px, #0c1118 4px 7px, transparent 7px calc(var(--rk-u) / 3)),
    var(--rk-rail);
  background-size: 5px 100%; background-repeat: repeat-y; background-position: center;
  background-color: var(--rk-rail);
}
.rk-rail--l { grid-column: 2; }
.rk-rail--r { grid-column: 4; }
.rk-bay { grid-column: 3; grid-row: 1 / -1; background: repeating-linear-gradient(180deg, var(--rk-bay) 0 calc(var(--rk-u) - 1px), #1a2230 calc(var(--rk-u) - 1px) var(--rk-u)); }

/* 機器（ボタン）。grid-row は 1 = 24U（一番上） */
.rk-dev {
  grid-column: 3; position: relative; z-index: 1; margin: 1px 2px;
  display: flex; align-items: center; padding: 0 10px; border: 0; border-radius: 2px;
  font: inherit; font-size: 11.5px; font-weight: 700; color: #e6edf6; text-align: left; line-height: 1.2;
  cursor: pointer; overflow: hidden; transition: opacity .2s, box-shadow .2s;
}
.rk-dev span { position: relative; z-index: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.rk-dev::after { content: ""; position: absolute; top: 50%; right: 8px; transform: translateY(-50%); }
.rk-dev:focus-visible { outline: 3px solid var(--rk-pick); outline-offset: 1px; }
.rk-rack.is-picking .rk-dev:not(.is-on) { opacity: .4; }
.rk-dev.is-on { box-shadow: 0 0 0 2px var(--rk-pick), 0 0 14px rgba(79, 195, 247, .45); }

/* 機器ごとの見た目（実物に近い色と形） */
.rk-dev--pp { background: #cfd6df; color: #1a2433; }
.rk-dev--pp::after { width: 58%; height: 8px; background: repeating-linear-gradient(90deg, #1b2330 0 7px, transparent 7px 10px); }
.rk-dev--cm { background: #161d27; color: #9fb3c8; font-weight: 500; }
.rk-dev--cm::after { width: 62%; height: 4px; border-radius: 2px; background: #05080c; }
.rk-dev--sw { background: #33404f; }
.rk-dev--sw::after { width: 58%; height: 9px; background:
  radial-gradient(circle, #55d68a 0 1.5px, transparent 2px) 0 0 / 10px 3px repeat-x,
  repeating-linear-gradient(90deg, #11161d 0 7px, transparent 7px 10px) 0 3px / 100% 6px no-repeat; }
.rk-dev--utm { background: #3d4a5c; }
.rk-dev--utm::after { width: 30%; height: 8px; background: repeating-linear-gradient(90deg, #11161d 0 7px, transparent 7px 10px); }
.rk-dev--shelf { background: transparent; align-items: flex-end; padding-bottom: 6px; border-bottom: 3px solid #8a96a3; border-radius: 0; }
.rk-dev--shelf::before, .rk-dev--shelf::after {
  content: ""; position: absolute; bottom: 3px; width: 15%; height: 55%; background: #e9edf2; border-radius: 3px; top: auto; transform: none;
}
.rk-dev--shelf::before { right: calc(15% + 16px); }  /* 左側の文字と重ならないよう、箱は右に寄せる */
.rk-dev--shelf::after { right: 8px; }
.rk-dev--shelf span { color: #cfd9e5; }
.rk-dev--server { background: repeating-linear-gradient(90deg, #252f3c 0 22px, #1c2530 22px 24px); }
.rk-dev--server::after { width: 10px; height: 10px; border-radius: 50%; background: #55d68a; box-shadow: 0 0 6px #55d68a; }
.rk-dev--nvr { background: #2a3442; }
.rk-dev--nvr::after { width: 26%; height: 5px; border-radius: 2px; background: #11161d; }
.rk-dev--spare { background: transparent; border: 1px dashed #5d6f86; color: #8fa3ba; font-weight: 500; justify-content: center; }
.rk-dev--pdu { background: #1e2733; }
.rk-dev--pdu::after { width: 58%; height: 8px; background: repeating-linear-gradient(90deg, #0a0e13 0 9px, transparent 9px 14px); }
.rk-dev--ups { background: #151c26; }
.rk-dev--ups::after { width: 34px; height: 14px; border-radius: 2px; background: #6fd3ff; opacity: .85; }

/* 選んだ機器の説明 */
.rk-note { background: #fff; border: 1px solid var(--rk-rule); border-left: 4px solid var(--rk-pick); border-radius: 6px; padding: 18px 20px; min-height: 190px; }
.rk-note__pos { font-size: 13px; color: var(--blue); font-weight: 700; font-variant-numeric: tabular-nums; }
.rk-note h3 { font-size: 18px; color: var(--navy); margin: 4px 0 8px; }
.rk-note p { font-size: 15px; }
.rk-note__hint { margin-top: 12px; font-size: 12px; color: var(--muted); }
.rk-plan__foot { grid-column: 1 / -1; font-size: 12px; color: var(--muted); }
@media (prefers-reduced-motion: reduce) { .rk-dev { transition: none; } }

/* ---------- 本文 ---------- */
.rk-sec { padding: 64px 0; }
.rk-sec + .rk-sec { border-top: 1px solid var(--rk-rule); }
.rk-sec--tint { background: var(--sky); }
.rk-head { margin-bottom: 28px; max-width: 760px; }
.rk-head h2 { font-size: clamp(22px, 3vw, 28px); color: var(--navy); line-height: 1.45; }
.rk-head p { margin-top: 10px; color: var(--muted); }

/* ラック実装で行うこと */
.rk-jobs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px 36px; margin: 0; }
.rk-jobs > div { padding-top: 14px; border-top: 3px solid var(--navy); }
.rk-jobs dt { font-weight: 700; color: var(--navy); font-size: 17px; }
.rk-jobs dd { margin: 6px 0 0; color: var(--muted); font-size: 15px; }

/* 整理前・整理後の対比 */
.rk-pairs { border: 1px solid var(--rk-rule); border-radius: 10px; overflow: hidden; background: #fff; }
.rk-pairs__head, .rk-pair { display: grid; grid-template-columns: 1fr 1fr; }
.rk-pairs__head span { padding: 12px 20px; font-weight: 700; font-size: 14px; color: #fff; }
.rk-pairs__head span:first-child { background: var(--rk-bad); }
.rk-pairs__head span:last-child { background: var(--rk-good); }
.rk-pair + .rk-pair { border-top: 1px solid var(--rk-rule); }
.rk-pair p { padding: 16px 20px; font-size: 15px; }
.rk-pair p:first-child { color: var(--muted); border-right: 1px solid var(--rk-rule); }
.rk-pair p:last-child { color: var(--ink); }
.rk-pair small { display: none; font-weight: 700; font-size: 12px; margin-bottom: 2px; }

/* 作業の流れ：大きな数字の縦並び */
.rk-steps { list-style: none; margin: 0; padding: 0; counter-reset: rkstep; max-width: 820px; }
.rk-steps li { display: grid; grid-template-columns: 64px 1fr; gap: 8px 20px; padding: 18px 0; border-bottom: 1px solid var(--rk-rule); }
.rk-steps li::before {
  counter-increment: rkstep; content: counter(rkstep);
  grid-row: 1 / span 2; font-size: 44px; font-weight: 900; line-height: 1; color: #c3d2e6; font-variant-numeric: tabular-nums;
}
.rk-steps h3 { font-size: 18px; color: var(--navy); }
.rk-steps p { font-size: 15px; color: var(--muted); }

.rk-docs { font-size: 17px; }
.rk-docs strong { color: var(--navy); }
.rk-area { font-size: 17px; }
.rk-area strong { color: var(--navy); }

/* ---------- 画面幅ごとの調整 ---------- */
@media (max-width: 1100px) {
  .rk-hero__inner { grid-template-columns: 1fr; gap: 32px; padding-top: 44px; padding-bottom: 52px; }
  .rk-plan { max-width: 720px; }
}
@media (max-width: 860px) {
  .rk-jobs { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  :root { --rk-u: 20px; }
  .rk-sec { padding: 48px 0; }
  .rk-hero__cta .btn { width: 100%; }
  .rk-plan { grid-template-columns: 1fr; gap: 16px; }
  .rk-note { min-height: 0; }
  .rk-jobs { grid-template-columns: 1fr; gap: 20px; }
  .rk-pairs__head { display: none; }
  .rk-pair { grid-template-columns: 1fr; }
  .rk-pair p:first-child { border-right: 0; padding-bottom: 4px; }
  .rk-pair p:last-child { padding-top: 4px; }
  .rk-pair small { display: block; }
  .rk-pair p:first-child small { color: var(--rk-bad); }
  .rk-pair p:last-child small { color: var(--rk-good); }
  .rk-steps li { grid-template-columns: 44px 1fr; }
  .rk-steps li::before { font-size: 34px; }
}