/* Zephmail 販売ページ スタイル */
:root {
  /* アイコンに合わせた水色ベースのライトテーマ */
  --bg: #e9f5fc;
  --bg-alt: #d8eefa;
  --surface: #ffffff;
  --surface-2: #ecf6fd;
  --border: #c9e4f3;
  --text: #123243;
  --text-muted: #587b8f;
  --primary: #1f93cf;
  --primary-2: #57c1ee;
  --accent: #17b6cf;
  --leaf: #6bc487;
  --grad-1: #2aa4e2;
  --grad-2: #2ccfcf;
  --radius: 16px;
  --maxw: 1080px;
  font-family: "Segoe UI", "Yu Gothic UI", "Hiragino Kaku Gothic ProN", Meiryo,
    system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: radial-gradient(1100px 560px at 72% -12%, #cfeaf9 0%, var(--bg) 58%);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ---------- ヘッダー ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(233, 245, 252, 0.78);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-weight: 800;
  font-size: 19px;
  letter-spacing: 0.2px;
}

.logo-mark {
  color: var(--accent);
}

.brand-icon {
  width: 1.35em;
  height: 1.35em;
  vertical-align: -0.28em;
  border-radius: 5px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 14.5px;
  color: var(--text-muted);
}

.nav a:hover {
  color: var(--text);
}

.nav-cta {
  background: var(--primary);
  color: #fff !important;
  padding: 8px 16px;
  border-radius: 10px;
  font-weight: 600;
}

.nav-cta:hover {
  background: var(--primary-2);
}

@media (max-width: 720px) {
  .nav a:not(.nav-cta) {
    display: none;
  }
}

/* ---------- ヒーロー ---------- */
.hero {
  padding: 80px 0 40px;
  text-align: center;
}

.badge {
  display: inline-block;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 13px;
  color: var(--text-muted);
  background: var(--surface);
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(32px, 5.4vw, 58px);
  line-height: 1.18;
  font-weight: 850;
  letter-spacing: -0.5px;
  margin: 0 0 20px;
}

.grad {
  background: linear-gradient(100deg, var(--grad-1), var(--grad-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  max-width: 680px;
  margin: 0 auto 30px;
  font-size: clamp(15px, 2.2vw, 19px);
  color: var(--text-muted);
}

.hero-sub strong {
  color: var(--text);
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 12px;
  font-weight: 650;
  font-size: 15.5px;
  transition: transform 0.12s ease, background 0.15s, border-color 0.15s;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(100deg, var(--primary), var(--primary-2));
  color: #fff;
  box-shadow: 0 10px 28px rgba(31, 147, 207, 0.34);
}

.btn-ghost {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
}

.btn-ghost:hover {
  border-color: var(--primary);
}

.hero-note {
  margin-top: 18px;
  font-size: 13.5px;
  color: var(--text-muted);
}

/* 疑似アプリウィンドウ */
.hero-window {
  max-width: 940px;
  margin: 54px auto 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 30px 80px rgba(23, 80, 120, 0.18);
  text-align: left;
}

.win-bar {
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
  color: #fff;
  font-size: 13px;
  font-weight: 600;
}

.win-controls {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* Windows のウィンドウ操作ボタン（最小化・最大化・閉じる） */
.win-ctl {
  width: 14px;
  height: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.92);
  font-size: 11px;
  line-height: 1;
}
.win-min::before {
  content: "";
  width: 10px;
  height: 1.5px;
  background: currentColor;
}
.win-max::before {
  content: "";
  width: 9px;
  height: 9px;
  border: 1.5px solid currentColor;
  border-radius: 1px;
}

.win-body {
  display: grid;
  grid-template-columns: 170px 1fr 1.1fr;
  min-height: 300px;
}

.win-side {
  background: var(--bg-alt);
  border-right: 1px solid var(--border);
  padding: 14px 10px;
  font-size: 13px;
  color: var(--text-muted);
}

.win-compose {
  background: var(--primary);
  color: #fff;
  text-align: center;
  padding: 9px;
  border-radius: 999px;
  font-weight: 600;
  margin-bottom: 14px;
}

.win-folder {
  padding: 8px 10px;
  border-radius: 8px;
}

.win-folder.active {
  background: var(--surface-2);
  color: var(--text);
}

.win-ai {
  margin-top: 14px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
}

.win-list {
  border-right: 1px solid var(--border);
  padding: 8px;
}

.win-msg {
  padding: 12px 12px;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.win-from {
  font-size: 13px;
  color: var(--text-muted);
}

.win-msg.unread .win-from,
.win-msg.unread .win-subj {
  color: var(--text);
  font-weight: 700;
}

.win-subj {
  font-size: 13.5px;
}

.win-chat {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--bg-alt);
}

.chat-you,
.chat-ai,
.chat-draft {
  padding: 10px 13px;
  border-radius: 12px;
  font-size: 13px;
  max-width: 92%;
}

.chat-you {
  align-self: flex-end;
  background: var(--primary);
  color: #fff;
  border-bottom-right-radius: 4px;
}

.chat-ai {
  align-self: flex-start;
  background: var(--surface-2);
  border-bottom-left-radius: 4px;
}

.chat-draft {
  align-self: flex-start;
  border: 1px dashed var(--accent);
  color: var(--accent);
  font-weight: 600;
}

@media (max-width: 760px) {
  .win-body {
    grid-template-columns: 1fr;
  }
  .win-side,
  .win-list {
    display: none;
  }
}

/* ---------- 価値提案 ---------- */
.values {
  padding: 40px 0 20px;
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.value-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
}

.value-icon {
  font-size: 28px;
  margin-bottom: 10px;
}

.value-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.value-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 14.5px;
}

@media (max-width: 800px) {
  .values-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- セクション共通 ---------- */
.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-title {
  text-align: center;
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 800;
  margin: 0 0 10px;
}

.section-lead {
  text-align: center;
  color: var(--text-muted);
  margin: 0 auto 40px;
  max-width: 620px;
}

/* 機能グリッド */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 18px;
  font-size: 15px;
}

@media (max-width: 720px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }
}

/* ステップ */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 36px;
}

.step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(100deg, var(--primary), var(--accent));
  color: #04122a;
  font-weight: 800;
  margin-bottom: 12px;
}

.step h3 {
  margin: 0 0 6px;
  font-size: 17px;
}

.step p {
  margin: 0;
  color: var(--text-muted);
  font-size: 14.5px;
}

@media (max-width: 800px) {
  .steps {
    grid-template-columns: 1fr;
  }
}

/* コード表示 */
.code-callout {
  max-width: 760px;
  margin: 0 auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}

.code-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.code-callout pre {
  margin: 0;
  background: #0e2536;
  border: 1px solid #0e2536;
  border-radius: 10px;
  padding: 16px;
  overflow-x: auto;
  font-size: 13px;
  color: #d7ecff;
}

.code-note {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--text-muted);
}

/* 価格 */
.pricing-card {
  max-width: 460px;
  margin: 0 auto;
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
}

.pricing-tag {
  display: inline-block;
  background: var(--surface-2);
  color: var(--accent);
  border-radius: 999px;
  padding: 5px 14px;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 14px;
}

.pricing-card h3 {
  margin: 0 0 10px;
  font-size: 24px;
}

.pricing-card p {
  color: var(--text-muted);
  margin: 0 0 20px;
}

/* ダウンロード */
.download-inner {
  text-align: center;
}

.download-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

/* FAQ */
.faq {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 6px 18px;
}

.faq summary {
  cursor: pointer;
  padding: 12px 0;
  font-weight: 650;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "＋";
  float: right;
  color: var(--text-muted);
}

.faq details[open] summary::after {
  content: "－";
}

.faq details p {
  margin: 0 0 14px;
  color: var(--text-muted);
  font-size: 14.5px;
}

/* CTA */
.cta {
  padding: 84px 0;
  text-align: center;
}

.cta-inner h2 {
  font-size: clamp(26px, 4vw, 40px);
  margin: 0 0 12px;
}

.cta-inner p {
  color: var(--text-muted);
  margin: 0 0 26px;
}

/* フッター */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 0 24px;
  background: var(--bg-alt);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.footer-brand {
  font-weight: 800;
}

.footer-brand p {
  font-weight: 400;
  color: var(--text-muted);
  font-size: 14px;
  margin: 8px 0 0;
  max-width: 320px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 14.5px;
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--text);
}

.footer-bottom {
  padding-top: 18px;
  font-size: 13px;
  color: var(--text-muted);
}

/* ---------- 言語スイッチャー ---------- */
.lang-switch {
  margin-left: 4px;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
}
.lang-switch:hover {
  border-color: var(--primary);
}
@media (max-width: 720px) {
  .lang-switch {
    margin-left: auto;
  }
}

/* ---------- 価格表示 ---------- */
.pricing-price {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 6px;
  margin: 6px 0 2px;
}
.pricing-amount {
  font-size: 46px;
  font-weight: 850;
  letter-spacing: -1px;
  color: var(--text);
}
.pricing-per {
  color: var(--text-muted);
  font-size: 16px;
}
.pricing-year {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 18px;
}
.pricing-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- 変更履歴 ---------- */
.changelog {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.cl-entry {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
}
.cl-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.cl-version {
  font-weight: 800;
  font-size: 18px;
  color: var(--text);
}
.cl-date {
  color: var(--text-muted);
  font-size: 13px;
}
.cl-badge {
  background: var(--surface-2);
  color: var(--primary);
  border-radius: 999px;
  padding: 3px 12px;
  font-size: 12px;
  font-weight: 700;
}
.cl-list {
  margin: 0;
  padding-left: 20px;
  color: var(--text);
}
.cl-list li {
  margin: 6px 0;
  font-size: 14.5px;
}

/* ---------- 疑似アプリ: メールビュー（3ペイン目） ---------- */
.win-view {
  background: var(--surface);
  padding: 18px;
  overflow: hidden;
}
.win-view-subject {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
}
.win-view-from {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 14px;
}
.win-avatar {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
}
.win-view-meta {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.win-view-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
}
.win-view-addr {
  font-size: 11.5px;
  color: var(--text-muted);
}
.win-view-date {
  margin-left: auto;
  font-size: 11.5px;
  color: var(--text-muted);
  flex-shrink: 0;
}
.win-view-body {
  margin: 0;
  font-size: 12.5px;
  color: var(--text);
  line-height: 1.75;
}

/* ---------- フッター（カラム型・editure風） ---------- */
.footer-cols {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}
.footer-col {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 14px;
}
.footer-col h4 {
  margin: 0 0 4px;
  font-size: 13px;
  color: var(--text);
  font-weight: 700;
}
.footer-col a {
  color: var(--text-muted);
}
.footer-col a:hover {
  color: var(--text);
}
@media (max-width: 720px) {
  .footer-cols {
    grid-template-columns: 1fr 1fr;
  }
}

/* ---------- 法的ページ ---------- */
.legal {
  padding-top: 44px;
}
.legal-inner {
  max-width: 760px;
}
.legal-title {
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 800;
  margin: 0 0 10px;
}
.legal-note {
  color: var(--text-muted);
  font-size: 13px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
  margin: 0 0 24px;
}
.legal h2 {
  font-size: 18px;
  margin: 28px 0 8px;
}
.legal p,
.legal li {
  color: var(--text);
  font-size: 14.5px;
  line-height: 1.85;
}
.legal a {
  color: var(--primary);
}
.legal-table {
  width: 100%;
  border-collapse: collapse;
  margin: 8px 0 20px;
}
.legal-table th,
.legal-table td {
  text-align: left;
  vertical-align: top;
  padding: 10px 12px;
  border: 1px solid var(--border);
  font-size: 14px;
}
.legal-table th {
  width: 34%;
  background: var(--surface-2);
  color: var(--text);
  font-weight: 700;
}