:root {
  --font: 'Poppins', sans-serif;
  --text-color: #333;
  --primary: #FFC107;
  --primary-dark: #FFA000;
  --accent: #FFB300;
}

/* リセット & ベース */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: var(--font);
  color: var(--text-color);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(270deg, #FFF8E1, #FFE082, #FFC107, #FFE082);
  background-size: 800% 800%;
  animation: gradientMove 20s ease infinite;
}
@keyframes gradientMove {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* コンテナ */
.app-container {
  width: 90vw;
  max-width: 800px;
  padding: 40px 32px;
  text-align: center;
}
.app-title {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 32px;
  color: #fff;
  letter-spacing: 1px;
}

/* 入力欄 */
.input-group {
  display: flex;
  justify-content: center;
  margin-bottom: 24px;
}
.input-field {
  width: 100%;
  max-width: 600px;
  padding: 14px;
  font-size: 1rem;
  border: 2px solid transparent;
  border-radius: 8px;
  background: rgba(255,255,255,0.8);
  transition: all 0.2s;
}
.input-field:focus {
  outline: none;
  border-color: var(--accent);
  background: #fff;
}

/* 実行ボタン */
.run-btn {
  width: 100%;
  max-width: 600px;
  padding: 16px;
  font-size: 1.1rem;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s;
  margin: 0 auto 32px;
  display: block;
}
.run-btn:hover:not(:disabled) {
  background: var(--primary-dark);
}

/* ローダー */
.loader {
  display: none;
  margin: 0 auto 24px;
  width: 48px;
  height: 48px;
  border: 5px solid rgba(255,255,255,0.5);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* グリッド */
#grid {
  opacity: 0;
  transition: opacity 0.3s;
  width: 100%;
  max-width: 600px;
  margin: 0 auto 24px;
}
#grid.visible { opacity: 1; }
.tabulator .tabulator-header .tabulator-col {
  background: var(--primary);
  color: #fff;
  font-weight: 600;
}
.tabulator .tabulator-row:hover {
  background: rgba(255,193,7,0.1);
}

/* CSVボタン */
.csv-btn {
  display: none;
  padding: 12px 24px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s;
  margin: 32px auto 0;
}
.csv-btn:hover {
  background: var(--primary-dark);
}

/* レスポンシブ */
@media (max-width: 768px) {
  .app-container { width: 95vw; padding: 24px 16px; }
  .run-btn, .input-field { max-width: 100%; }
}
@media (max-width: 480px) {
  .app-title { font-size: 1.5rem; }
  .input-field { padding: 12px; font-size: 0.9rem; }
  .run-btn { padding: 12px; font-size: 0.9rem; }
}

/* ログインモーダル */
#login-screen {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  align-items: center;
  justify-content: center;
  z-index: 999;
}
#login-screen .auth-container {
  width: 100%;
  max-width: 600px;
  padding: 32px;
  border-radius: 8px;
  background: rgba(255,255,255,0.95);
  position: relative;
}
#login-screen .close-btn {
  position: absolute;
  top: 12px; right: 12px;
  background: transparent; border: none;
  font-size: 1.2rem; cursor: pointer;
  color: var(--text-color);
}
#login-screen .auth-container h2 {
  font-size: 1rem; margin-bottom: 16px;
  color: var(--text-color);
}
#login-screen .auth-container input {
  width: 100%; padding: 12px; font-size: 1rem;
  margin-bottom: 16px;
  border: 2px solid rgba(0,0,0,0.2);
  border-radius: 8px; background: #fff;
}
#login-screen #btn-login {
  width: 100%; padding: 14px; font-size: 1rem;
  margin-bottom: 12px; background: var(--primary);
  color: #fff; border: none; border-radius: 8px;
  cursor: pointer; transition: background 0.2s;
}
#login-screen #btn-login:hover:not(:disabled) {
  background: var(--primary-dark);
}
#login-screen #btn-signup {
  width: 100%; padding: 14px; font-size: 1rem;
  background: transparent; color: var(--accent);
  border: 2px solid var(--accent); border-radius: 8px;
  cursor: pointer; transition: background 0.2s, color 0.2s;
}
#login-screen #btn-signup:hover {
  background: var(--accent); color: #fff;
}

/* ヘッダーのボタン群 */
.header-buttons {
  position: absolute;
  top: 16px; right: 16px;
  display: flex; gap: 8px;
  align-items: center; z-index: 1000;
}

/* ボタン共通スタイル（フラット） */
.btn-flat {
  background-color: var(--primary);
  color: #fff;
  border: 1px solid #fff;
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}
.btn-flat:hover {
  background-color: var(--primary-dark);
  transform: translateY(-1px);
}

/* プラン表示 */
#current-plan {
  color: #fff;
  font-weight: 600;
  margin-right: 8px;
}