:root {
  --bg: #FAFAFA;
  --card-bg: #FFFFFF;
  --border: #E5E5E8;
  --text: #1F1F1E;
  --text-soft: #73726E;
  --accent: #2E9DA6;
  --accent-tint: #E4F4F3;
  --accent-dark: #227C84;
  --discord-btn: #5865F2;
  --discord-hover: #4752C4;
  --radius: 10px;
  --font: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic Medium", sans-serif;
  --font-mono: "Ubuntu Mono", "Consolas", monospace;
}

*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font);
  font-weight: 400;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow-y: auto;
  -webkit-font-smoothing: antialiased;
}

.login-container {
  width: 100%;
  max-width: 440px;
  padding: 24px 20px;
  margin: auto;
}

.login-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 36px 28px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.06);
  text-align: center;
}

.brand {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px 6px 16px;
}

.brand img {
  height: 38px;
  width: auto;
  display: block;
}

.subtitle {
  font-size: 14px;
  font-weight: 400;
  color: var(--text-soft);
  margin: 0 0 28px 0;
  line-height: 1.6;
}

/* Discord ログインボタン */
.btn-discord {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
  padding: 12px 18px;
  background: var(--discord-btn);
  color: #ffffff;
  border: none;
  border-radius: var(--radius);
  font-size: 14.5px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s ease, transform 0.08s ease;
  box-shadow: 0 2px 8px rgba(88, 101, 242, 0.25);
}

.btn-discord:hover {
  background: var(--discord-hover);
}

.btn-discord:active {
  transform: scale(0.98);
}

.btn-discord svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

.divider {
  display: flex;
  align-items: center;
  margin: 24px 0 18px 0;
  color: var(--text-soft);
  font-size: 13px;
  font-weight: 500;
}

.divider::before,
.divider::after {
  content: "";
  flex: 1;
  border-bottom: 1px solid var(--border);
}

.divider span {
  padding: 0 12px;
}

/* API キーログイン */
.key-login-toggle {
  background: none;
  border: none;
  color: var(--text-soft);
  font-size: 13px;
  font-weight: 500;
  font-family: var(--font);
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 6px;
  transition: color 0.15s;
}

.key-login-toggle:hover {
  color: var(--accent);
}

.key-box {
  margin-top: 14px;
  text-align: left;
  box-sizing: border-box;
  width: 100%;
}

.key-input-group {
  display: flex;
  gap: 8px;
  margin-top: 6px;
  width: 100%;
  box-sizing: border-box;
}

.key-input {
  flex: 1;
  min-width: 0;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 500;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  background: var(--bg);
  color: var(--text);
  outline: none;
  box-sizing: border-box;
  transition: border-color 0.15s;
}

.key-input:focus {
  border-color: var(--accent);
}

.btn-key-submit {
  padding: 10px 18px;
  background: var(--accent);
  color: #ffffff;
  border: none;
  border-radius: var(--radius);
  font-size: 13.5px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s ease;
  white-space: nowrap;
}

.btn-key-submit:hover {
  background: var(--accent-dark);
}

/* 承認待機中ビュー */
.pending-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: var(--accent-tint);
  color: var(--accent-dark);
  border: 1px solid var(--accent);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 16px;
}

#pendingTitle {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 8px 0;
  color: var(--text);
}

.code-display-wrap {
  margin: 20px 0;
  padding: 18px;
  background: var(--accent-tint);
  border: 1.5px dashed var(--accent);
  border-radius: 12px;
  text-align: center;
}

.code-label {
  font-size: 12px;
  color: var(--text-soft);
  margin-bottom: 6px;
  font-weight: 500;
}

.code-number {
  font-size: 30px;
  font-family: "Silkscreen", "SF Mono", Menlo, Monaco, Consolas, monospace;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--accent-dark);
}

.btn-copy-code {
  margin-top: 12px;
  padding: 6px 16px;
  background: #ffffff;
  border: 1px solid var(--accent);
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  color: var(--accent-dark);
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  outline: none;
  -webkit-tap-highlight-color: transparent;
}

@media (hover: hover) {
  .btn-copy-code:hover {
    background: var(--accent);
    color: #ffffff;
  }
}

.btn-copy-code.copied {
  background: var(--accent-dark) !important;
  border-color: var(--accent-dark) !important;
  color: #ffffff !important;
}

.code-expiry-wrap {
  margin-top: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.code-expiry-text {
  font-size: 12.5px;
  font-weight: 500;
  color: var(--text-soft);
  background: var(--bg);
  padding: 4px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
}

.error-msg {
  color: #E5484D;
  font-size: 13px;
  font-weight: 500;
  margin-top: 10px;
}

/* アクセシビリティ用視覚非表示ユーティリティ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 480px) {
  body {
    justify-content: flex-start;
    padding-top: 28px;
  }
  .login-container {
    padding: 8px 16px 40px;
  }
  .login-card {
    padding: 28px 20px;
  }
}