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

:root {
  --bg: #ffffff;
  --bg-secondary: #f3f4f6;
  --text: #111827;
  --text-secondary: #6b7280;
  --border: #e5e7eb;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-text: #ffffff;
  --success: #10b981;
  --error: #ef4444;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
  --bg: #111827;
  --bg-secondary: #1f2937;
  --text: #f9fafb;
  --text-secondary: #9ca3af;
  --border: #374151;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

@media (prefers-color-scheme: dark) {
  [data-theme="auto"] {
    --bg: #111827;
    --bg-secondary: #1f2937;
    --text: #f9fafb;
    --text-secondary: #9ca3af;
    --border: #374151;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  }
}

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  background: var(--bg);
  color: var(--text);
  transition: background-color 0.2s, color 0.2s;
}

.app {
  max-width: 360px;
  min-height: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
}

.view {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.view[hidden] {
  display: none;
}

header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  border-bottom: 1px solid var(--border);
}

header h1 {
  font-size: 18px;
  font-weight: 600;
  flex: 1;
}

.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: var(--radius);
  background: var(--bg-secondary);
  color: var(--text);
  cursor: pointer;
  transition: background-color 0.2s;
}

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

main {
  flex: 1;
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Input styles */
.input-group,
.setting-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

label {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
}

input[type="tel"],
input[type="url"] {
  width: 100%;
  padding: 14px 16px;
  font-size: 18px;
  font-family: inherit;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s;
}

input[type="tel"]:focus,
input[type="url"]:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

input::placeholder {
  color: var(--text-secondary);
  opacity: 0.6;
}

.hint {
  font-size: 12px;
  color: var(--text-secondary);
}

/* Primary button */
.primary-btn {
  width: 100%;
  padding: 16px;
  font-size: 16px;
  font-weight: 600;
  font-family: inherit;
  border: none;
  border-radius: var(--radius);
  background: var(--primary);
  color: var(--primary-text);
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
}

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

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

.primary-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Status message */
.status {
  padding: 12px 16px;
  font-size: 14px;
  border-radius: var(--radius);
  text-align: center;
}

.status.success {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
}

.status.error {
  background: rgba(239, 68, 68, 0.1);
  color: var(--error);
}

/* Toggle switch */
.toggle-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.toggle-label span:first-child {
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
}

.toggle-label input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle {
  position: relative;
  width: 48px;
  height: 28px;
  background: var(--border);
  border-radius: 14px;
  transition: background-color 0.2s;
}

.toggle::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 24px;
  height: 24px;
  background: white;
  border-radius: 50%;
  box-shadow: var(--shadow);
  transition: transform 0.2s;
}

.toggle-label input:checked + .toggle {
  background: var(--primary);
}

.toggle-label input:checked + .toggle::after {
  transform: translateX(20px);
}

/* Radio buttons */
.theme-options {
  display: flex;
  gap: 8px;
  margin-top: 4px;
}

.radio-label {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  background: var(--bg-secondary);
  border: 2px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.2s, background-color 0.2s;
}

.radio-label input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.radio-label:has(input:checked) {
  border-color: var(--primary);
  background: var(--bg);
}

.setting-group + .setting-group {
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

/* Secondary button */
.secondary-btn {
  width: 100%;
  padding: 12px 16px;
  font-size: 14px;
  font-weight: 500;
  font-family: inherit;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  color: var(--text);
  cursor: pointer;
  transition: background-color 0.2s, border-color 0.2s;
}

.secondary-btn:hover {
  background: var(--border);
  border-color: var(--text-secondary);
}

/* History list */
.history-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.history-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.2s;
}

.history-item:hover {
  background: var(--border);
}

.history-item-number {
  flex: 1;
  font-size: 16px;
  font-weight: 500;
  color: var(--text);
}

.history-item-date {
  font-size: 12px;
  color: var(--text-secondary);
}

.empty-state {
  text-align: center;
  color: var(--text-secondary);
  padding: 40px 16px;
}

/* RTL Support */
[dir="rtl"] .toggle::after {
  left: auto;
  right: 2px;
}

[dir="rtl"] .toggle-label input:checked + .toggle::after {
  transform: translateX(-20px);
}

[dir="rtl"] input[type="tel"],
[dir="rtl"] input[type="url"] {
  text-align: left;
  direction: ltr;
}

[dir="rtl"] #back-btn svg,
[dir="rtl"] #history-back-btn svg {
  transform: scaleX(-1);
}

[dir="rtl"] .history-item-number {
  direction: ltr;
  text-align: right;
}