/* 基礎與色彩變數 (自動跟隨系統深淺色設定) */
:root {
  --bg-page: #f9fafb;
  --bg-card: #ffffff;
  --bg-subtle: #f3f4f6;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --text-main: #111827;
  --text-muted: #6b7280;
  --text-dim: #9ca3af;
  
  --primary-bg: #111827;
  --primary-text: #ffffff;
  --primary-hover: #1f2937;
  
  --success-bg: #ecfdf5;
  --success-border: #a7f3d0;
  --success-text: #065f46;

  --error-bg: #fef2f2;
  --error-border: #fecaca;
  --error-text: #991b1b;

  --radius: 3px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-page: #0d1117;
    --bg-card: #161b22;
    --bg-subtle: #21262d;
    --border: #30363d;
    --border-strong: #484f58;
    --text-main: #f0f6fc;
    --text-muted: #8b949e;
    --text-dim: #6e7681;

    --primary-bg: #f0f6fc;
    --primary-text: #0d1117;
    --primary-hover: #c9d1d9;

    --success-bg: #062b1a;
    --success-border: #135e38;
    --success-text: #7ee787;

    --error-bg: #3c1618;
    --error-border: #672022;
    --error-text: #ff7b72;
  }
}

/* 樣式重置 (無漸層、無陰影、俐落極簡) */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.container {
  width: 100%;
  max-width: 460px;
}

/* 主卡片 (無陰影、無漸層、純色邊框) */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
}

.card-header {
  margin-bottom: 1.5rem;
}

.title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.subtitle {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.card-body {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.info-box {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border);
  padding: 0.625rem 0.875rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
}

.info-label {
  color: var(--text-muted);
}

.info-value {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--text-main);
}

/* 按鈕樣式 (無陰影、無超大圓角) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  border-radius: var(--radius);
  transition: background-color 0.15s ease, border-color 0.15s ease;
  border: 1px solid transparent;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--primary-bg);
  color: var(--primary-text);
  border-color: var(--primary-bg);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* 狀態提示盒 */
.status-box {
  padding: 0.75rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  border: 1px solid transparent;
}

.status-box.success {
  background-color: var(--success-bg);
  border-color: var(--success-border);
  color: var(--success-text);
}

.status-box.error {
  background-color: var(--error-bg);
  border-color: var(--error-border);
  color: var(--error-text);
}

/* 極簡 Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 1000;
}

.modal-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  width: 100%;
  max-width: 380px;
  padding: 1.5rem;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.modal-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
}

.modal-close-btn {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0 0.25rem;
}

.modal-close-btn:hover {
  color: var(--text-main);
}

.modal-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.turnstile-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 70px;
  margin-bottom: 1rem;
}

.modal-msg {
  font-size: 0.875rem;
  padding: 0.5rem;
  border-radius: var(--radius);
  text-align: center;
}

.modal-msg.error {
  background-color: var(--error-bg);
  color: var(--error-text);
  border: 1px solid var(--error-border);
}

.hidden {
  display: none !important;
}