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

:root {
  --bg: #f0f0f8;
  --white: #ffffff;
  --primary: #6d28d9;
  --primary-mid: #7c3aed;
  --primary-dark: #4c1d95;
  --primary-light: #ede9fe;
  --primary-lighter: #f5f3ff;
  --accent: #ec4899;
  --accent-light: #fce7f3;
  --danger: #dc2626;
  --text: #18181b;
  --text-muted: #71717a;
  --border: #e4e4e7;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 2px 8px rgba(109,40,217,0.07), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 6px 24px rgba(109,40,217,0.13), 0 2px 6px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 40px rgba(109,40,217,0.18), 0 4px 12px rgba(0,0,0,0.08);
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ナビゲーション */
nav {
  background: linear-gradient(135deg, #4c1d95 0%, #6d28d9 50%, #7c3aed 100%);
  padding: 0 32px;
  height: 62px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 4px 20px rgba(109,40,217,0.3);
}

.nav-logo {
  font-size: 18px;
  font-weight: 800;
  color: #fff;
  text-decoration: none;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links {
  display: flex;
  gap: 8px;
  align-items: center;
}

/* ボタン */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: all 0.2s ease;
  letter-spacing: -0.1px;
}

.btn-primary {
  background: linear-gradient(135deg, #7c3aed, #ec4899);
  color: #fff;
  box-shadow: 0 2px 12px rgba(124,58,237,0.4);
}

.btn-primary:hover {
  box-shadow: 0 6px 20px rgba(124,58,237,0.5);
  transform: translateY(-2px);
  filter: brightness(1.05);
}

.btn-outline {
  background: rgba(255,255,255,0.15);
  color: #fff;
  border: 1.5px solid rgba(255,255,255,0.3);
  backdrop-filter: blur(4px);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.25);
  border-color: rgba(255,255,255,0.5);
  transform: translateY(-1px);
}

.btn-danger {
  background: linear-gradient(135deg, #dc2626, #f87171);
  color: #fff;
  box-shadow: 0 2px 8px rgba(220,38,38,0.3);
}

.btn-danger:hover {
  box-shadow: 0 4px 16px rgba(220,38,38,0.4);
  transform: translateY(-1px);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 13px;
}

/* ナビ外のアウトラインボタン */
.container .btn-outline,
.container-wide .btn-outline,
.card .btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1.5px solid var(--border);
}

.container .btn-outline:hover,
.container-wide .btn-outline:hover,
.card .btn-outline:hover {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
}

/* カード */
.card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
  border: 1px solid rgba(109,40,217,0.08);
}

/* フォーム */
.form-group {
  margin-bottom: 18px;
}

label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

input, textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text);
  background: #fff;
  transition: all 0.15s;
  outline: none;
  font-family: inherit;
}

input:focus, textarea:focus {
  border-color: var(--primary-mid);
  box-shadow: 0 0 0 4px rgba(124,58,237,0.1);
}

textarea {
  resize: vertical;
  min-height: 120px;
}

/* エラー・メッセージ */
.error {
  background: #fef2f2;
  color: var(--danger);
  border: 1px solid #fecaca;
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 13px;
  margin-bottom: 16px;
  display: none;
}

.success {
  background: #f0fdf4;
  color: #16a34a;
  border: 1px solid #bbf7d0;
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 13px;
  margin-bottom: 16px;
  display: none;
}

/* コンテナ */
.container {
  max-width: 700px;
  margin: 0 auto;
  padding: 32px 20px;
}

.container-wide {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 20px;
}

/* 認証ページ */
.auth-wrapper {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: linear-gradient(135deg, #4c1d95 0%, #6d28d9 40%, #ec4899 100%);
}

.auth-card {
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
  border: none;
}

.auth-title {
  font-size: 26px;
  font-weight: 800;
  margin-bottom: 6px;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.auth-sub {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 28px;
}

.auth-link {
  text-align: center;
  margin-top: 20px;
  font-size: 13px;
  color: var(--text-muted);
}

.auth-link a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 700;
}

.auth-link a:hover { text-decoration: underline; }

/* 投稿カード */
.post-card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 24px;
  margin-bottom: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: block;
  text-decoration: none;
  color: inherit;
  border: 1px solid rgba(109,40,217,0.08);
  border-left: 4px solid transparent;
}

.post-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-left-color: var(--primary-mid);
}

.post-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text);
  letter-spacing: -0.2px;
  line-height: 1.4;
}

.post-body-preview {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
  font-size: 12px;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.post-author {
  background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
  color: var(--primary);
  padding: 3px 10px;
  border-radius: 20px;
  font-weight: 700;
  font-size: 12px;
}

/* ページヘッダー */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.page-title {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary-mid));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ローディング */
.loading {
  text-align: center;
  padding: 64px;
  color: var(--text-muted);
  font-size: 14px;
}

/* 空状態 */
.empty {
  text-align: center;
  padding: 64px;
  color: var(--text-muted);
}

.empty-icon {
  font-size: 52px;
  margin-bottom: 12px;
}

/* ハンバーガーボタン */
.hamburger {
  display: none;
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  color: #fff;
  padding: 4px 8px;
  border-radius: 6px;
}

.hamburger:hover { background: rgba(255,255,255,0.15); }

/* ===== スマホ対応 ===== */
@media (max-width: 600px) {
  nav {
    flex-wrap: wrap;
    height: auto;
    padding: 10px 16px;
    position: relative;
  }

  .hamburger { display: block; }

  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 8px;
    padding: 12px 0 6px;
    border-top: 1px solid rgba(255,255,255,0.2);
    margin-top: 10px;
  }

  .nav-links.open { display: flex; }

  .nav-links .btn {
    width: 100%;
    justify-content: center;
    padding: 10px;
  }

  .container, .container-wide {
    padding: 16px 12px;
  }

  .page-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .auth-wrapper {
    padding: 16px;
    align-items: flex-start;
    padding-top: 40px;
  }

  .post-card { padding: 16px; }
  .post-title { font-size: 15px; }
  .card { padding: 16px; }

  .post-actions { flex-wrap: wrap; }
}