/* ========================================
   Конвертер валют - Стили
   ======================================== */

:root {
  /* Цветовая палитра */
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: rgba(30, 30, 50, 0.8);
  --bg-input: rgba(255, 255, 255, 0.05);
  --bg-input-hover: rgba(255, 255, 255, 0.08);
  --bg-dropdown: #1a1a2e;

  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted: rgba(255, 255, 255, 0.4);

  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.3);

  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;

  --border: rgba(255, 255, 255, 0.1);
  --border-focus: rgba(99, 102, 241, 0.5);

  /* Типографика */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;

  /* Отступы */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Закруглённые радиусы */
  --radius-sm: 0.75rem;
  --radius-md: 1rem;
  --radius-lg: 1.25rem;
  --radius-xl: 1.75rem;
  --radius-2xl: 2rem;

  /* Анимации */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
}

/* ========================================
   Reset & Base
   ======================================== */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;

  /* Градиентный фон */
  background:
    radial-gradient(ellipse at top left, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at bottom right, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
    var(--bg-primary);
  background-attachment: fixed;
}

/* ========================================
   App Container
   ======================================== */

.app {
  max-width: 520px;
  margin: 0 auto;
  padding: var(--spacing-lg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ========================================
   Header
   ======================================== */

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.source-selector {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.source-selector label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.source-selector select {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-lg);
  padding-right: 2.5rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12' fill='none'%3E%3Cpath d='M3 4.5L6 7.5L9 4.5' stroke='rgba(255,255,255,0.7)' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
}

.source-selector select:hover {
  background-color: var(--bg-input-hover);
  border-color: var(--border-focus);
}

.source-selector select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* Стилизация option для всех select */
select option {
  background-color: #1a1a2e;
  color: #ffffff;
  padding: 12px;
}

/* ========================================
   Converter Card
   ======================================== */

.converter-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-xl);
  box-shadow:
    0 25px 50px -12px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(255, 255, 255, 0.05) inset;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

/* ========================================
   Currency Input Group
   ======================================== */

.currency-input-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.currency-input-group label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  font-weight: 500;
}

.input-row {
  display: flex;
  gap: var(--spacing-sm);
  align-items: stretch;
}

.input-row input {
  flex: 1;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--text-primary);
  transition: all var(--transition-fast);
  min-width: 0;
}

.input-row input::placeholder {
  color: var(--text-muted);
}

.input-row input:hover {
  background: var(--bg-input-hover);
  border-color: var(--border-focus);
}

.input-row input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* Убираем стрелки у number input */
.input-row input::-webkit-outer-spin-button,
.input-row input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.input-row input[type="number"] {
  -moz-appearance: textfield;
  appearance: textfield;
}

/* Стилизованный Select для валют */
.input-row select {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md) var(--spacing-lg);
  padding-right: 2.5rem;
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-width: 110px;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16' fill='none'%3E%3Cpath d='M4 6L8 10L12 6' stroke='rgba(255,255,255,0.7)' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
}

.input-row select:hover {
  background-color: var(--bg-input-hover);
  border-color: var(--border-focus);
}

.input-row select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* ========================================
   Swap Button
   ======================================== */

.swap-btn {
  align-self: center;
  background: var(--accent);
  border: none;
  border-radius: 50%;
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-base);
  color: white;
  box-shadow: 0 4px 15px var(--accent-glow);
}

.swap-btn:hover {
  background: var(--accent-light);
  transform: scale(1.1);
  box-shadow: 0 6px 20px var(--accent-glow);
}

.swap-btn:active {
  transform: scale(0.95);
}

.swap-btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px var(--accent-glow), 0 4px 15px var(--accent-glow);
}

.swap-btn svg {
  transition: transform var(--transition-base);
}

.swap-btn:hover svg {
  transform: rotate(180deg);
}

/* ========================================
   Expenses Row (Строка с наценкой)
   ======================================== */

.expenses-row {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(245, 158, 11, 0.08));
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: var(--radius-md);
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
}

.expenses-label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--warning);
  background: rgba(245, 158, 11, 0.2);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
}

.expenses-values {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
  justify-content: flex-end;
}

.expenses-values .value {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--warning);
}

.expenses-values .currency {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-right: var(--spacing-xs);
}

.expenses-arrow {
  font-size: var(--font-size-base);
  color: var(--warning);
  font-weight: 600;
  margin: 0 var(--spacing-xs);
}

/* ========================================
   Rate Info
   ======================================== */

.rate-info {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border);
}

.rate-display {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.rate-display .rate-line {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
}

.rate-display .rate-line .rate-value {
  color: var(--success);
  font-weight: 600;
}

.rate-display .rate-loading {
  color: var(--text-muted);
  font-weight: 400;
  font-size: var(--font-size-base);
}

.update-time {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

/* ========================================
   Footer
   ======================================== */

.footer {
  margin-top: var(--spacing-xl);
  text-align: center;
  padding: var(--spacing-md);
}

.footer p {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* ========================================
   Loading Overlay
   ======================================== */

.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 15, 26, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.loading-overlay.active {
  opacity: 1;
  visibility: visible;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ========================================
   Animations
   ======================================== */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.converter-card {
  animation: fadeIn 0.5s ease-out;
}

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 480px) {
  .app {
    padding: var(--spacing-md);
  }

  .header {
    flex-direction: column;
    align-items: flex-start;
  }

  .converter-card {
    padding: var(--spacing-lg);
  }

  .input-row input {
    font-size: var(--font-size-xl);
    padding: var(--spacing-md);
  }

  .input-row select {
    min-width: 100px;
    padding: var(--spacing-md);
    font-size: var(--font-size-sm);
  }

  .expenses-row {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }

  .expenses-row .value {
    font-size: var(--font-size-lg);
  }
}

/* ========================================
   Utilities
   ======================================== */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}