/* ============================================================
   FX龍王塾 会員サイト スタイル v1.4.0
   黒 × ゴールド 高級感テーマ
   ============================================================ */

:root {
  --bg: #0a0a0c;
  --bg-card: #131316;
  --bg-card-hover: #1a1a1f;
  --gold: #c9a44c;
  --gold-bright: #e8c877;
  --gold-dim: rgba(201, 164, 76, 0.35);
  --text: #e8e6e0;
  --text-dim: #9a968c;
  --border: rgba(201, 164, 76, 0.18);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", sans-serif;
  line-height: 1.7;
  min-height: 100vh;
}

a { color: var(--gold); text-decoration: none; }

/* ── ヘッダー ── */
.site-header {
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #101014 0%, #0a0a0c 100%);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.brand .logo {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0.12em;
  background: linear-gradient(135deg, var(--gold-bright) 0%, var(--gold) 45%, #8a6d2f 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand .tagline {
  font-size: 12px;
  color: var(--text-dim);
  letter-spacing: 0.2em;
}

.logout-link {
  font-size: 13px;
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 6px 16px;
  border-radius: 4px;
  transition: all 0.25s;
}
.logout-link:hover { color: var(--gold); border-color: var(--gold-dim); }

/* ── メイン ── */
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 36px 24px 80px;
}

.hero {
  text-align: center;
  padding: 28px 0 44px;
}

.hero h1 {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}

.hero p { color: var(--text-dim); font-size: 14px; }

/* ── 章ジャンプメニュー ── */
.jump-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-bottom: 40px;
}

.jump-nav a {
  font-size: 13px;
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 7px 14px;
  border-radius: 999px;
  white-space: nowrap;
  transition: all 0.25s;
}

.jump-nav a:hover {
  color: var(--gold);
  border-color: var(--gold-dim);
}

/* 横スクロール時のスクロールバーは非表示（スマホ） */
.jump-nav::-webkit-scrollbar { display: none; }
.jump-nav { scrollbar-width: none; }

.gold-line {
  width: 64px;
  height: 2px;
  margin: 18px auto 0;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

/* ── 章 ── */
.chapter {
  margin-bottom: 48px;
  scroll-margin-top: 20px;
}

.chapter-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  border-left: 3px solid var(--gold);
  padding-left: 16px;
  margin-bottom: 20px;
}

.chapter-head h2 {
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.chapter-head .summary {
  font-size: 13px;
  color: var(--text-dim);
}

.chapter-head .progress {
  font-size: 12px;
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 2px 10px;
  border-radius: 999px;
  margin-left: auto;
  white-space: nowrap;
}

.chapter-head .progress.done {
  color: #0a0a0c;
  background: var(--gold);
  border-color: var(--gold);
  font-weight: 700;
}

/* ── 動画カードグリッド ── */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.video-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.25s, border-color 0.25s, background 0.25s;
}

.video-card:hover {
  transform: translateY(-3px);
  border-color: var(--gold-dim);
  background: var(--bg-card-hover);
}

.thumb {
  position: relative;
  aspect-ratio: 16 / 9;
  background: #000;
}

.thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  opacity: 0.85;
  transition: opacity 0.25s;
}

.video-card:hover .thumb img { opacity: 1; }

.play-badge {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.play-badge span {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(10, 10, 12, 0.7);
  border: 1.5px solid var(--gold);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gold);
  font-size: 18px;
  padding-left: 4px;
  transition: background 0.25s, transform 0.25s;
}

.video-card:hover .play-badge span {
  background: var(--gold);
  color: #0a0a0c;
  transform: scale(1.08);
}

.duration {
  position: absolute;
  right: 8px;
  bottom: 8px;
  background: rgba(0, 0, 0, 0.8);
  color: var(--text);
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 4px;
}

/* ── 視聴済みチェック ── */
.watch-toggle {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: rgba(10, 10, 12, 0.75);
  border: 1.5px solid var(--gold-dim);
  color: transparent;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.25s;
  line-height: 1;
}

.watch-toggle:hover {
  border-color: var(--gold);
  color: var(--gold-dim);
}

.video-card.watched .watch-toggle {
  background: var(--gold);
  border-color: var(--gold);
  color: #0a0a0c;
}

.video-card.watched .thumb img {
  opacity: 0.45;
}

.video-card.watched .card-body h3 {
  color: var(--text-dim);
}

.card-body { padding: 14px 16px 16px; }

.card-body h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
}

.card-body p {
  font-size: 13px;
  color: var(--text-dim);
}

/* ── 章の外部リンク ── */
.chapter-links {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.ext-link {
  display: inline-block;
  font-size: 13px;
  color: var(--gold-bright);
  border: 1px solid var(--gold-dim);
  padding: 8px 18px;
  border-radius: 5px;
  letter-spacing: 0.05em;
  transition: all 0.25s;
}

.ext-link:hover {
  background: var(--gold);
  color: #0a0a0c;
  border-color: var(--gold);
}

.ext-link .ext-arrow {
  font-weight: 700;
}

/* ── 再生モーダル ── */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.88);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 24px;
}

.modal.open { display: flex; }

/* モーダル表示中は背景ページのスクロールを固定 */
body.modal-open { overflow: hidden; }

.modal-inner {
  width: min(960px, 100%);
}

.modal-title {
  color: var(--gold-bright);
  font-size: 16px;
  margin-bottom: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.modal-close {
  background: none;
  border: 1px solid var(--gold-dim);
  color: var(--text);
  font-size: 14px;
  padding: 6px 18px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.25s;
  flex-shrink: 0;
}
.modal-close:hover { border-color: var(--gold); color: var(--gold); }

.player {
  aspect-ratio: 16 / 9;
  background: #000;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.player iframe { width: 100%; height: 100%; border: 0; display: block; }

/* ── ログイン画面 ── */
.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background:
    radial-gradient(ellipse at 50% -10%, rgba(201, 164, 76, 0.08), transparent 55%),
    var(--bg);
}

.login-box {
  width: min(420px, 100%);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 44px 36px;
  text-align: center;
}

.login-box .logo {
  font-size: 30px;
  font-weight: 700;
  letter-spacing: 0.14em;
  background: linear-gradient(135deg, var(--gold-bright) 0%, var(--gold) 45%, #8a6d2f 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.login-box .sub {
  font-size: 12px;
  color: var(--text-dim);
  letter-spacing: 0.25em;
  margin: 6px 0 30px;
}

.login-box input[type="password"] {
  width: 100%;
  padding: 13px 16px;
  background: #0d0d10;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 16px; /* 16px未満だとiPhoneでタップ時に自動ズームされる */
  margin-bottom: 16px;
  transition: border-color 0.25s;
}

.login-box input[type="password"]:focus {
  outline: none;
  border-color: var(--gold-dim);
}

.login-box button {
  width: 100%;
  padding: 13px;
  background: linear-gradient(135deg, var(--gold-bright), var(--gold) 60%, #a9852f);
  border: none;
  border-radius: 6px;
  color: #0a0a0c;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: filter 0.25s;
}

.login-box button:hover { filter: brightness(1.1); }

.login-error {
  color: #e07a6a;
  font-size: 13px;
  margin-bottom: 14px;
}

.login-note {
  margin-top: 22px;
  font-size: 12px;
  color: var(--text-dim);
}

.login-about {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  font-size: 13px;
}

.login-about a {
  color: var(--gold);
  letter-spacing: 0.05em;
}

.login-about a:hover {
  color: var(--gold-bright);
  text-decoration: underline;
}

.login-sns {
  margin-top: 14px;
  display: flex;
  justify-content: center;
  gap: 10px;
}

.login-sns a {
  font-size: 12px;
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 6px 14px;
  border-radius: 999px;
  transition: all 0.25s;
}

.login-sns a:hover {
  color: var(--gold);
  border-color: var(--gold-dim);
  text-decoration: none;
}

/* ── フッター ── */
.site-footer {
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 24px;
  font-size: 12px;
  color: var(--text-dim);
  letter-spacing: 0.08em;
}

@media (max-width: 600px) {
  .brand .logo { font-size: 21px; }
  .hero h1 { font-size: 18px; }
  .chapter-head { flex-direction: column; align-items: flex-start; gap: 4px; }
  .chapter-head h2 { font-size: 17px; }
  .chapter-head .progress { margin-left: 0; }
  .jump-nav {
    flex-wrap: nowrap;
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
  }
}