/* Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Variables */
:root {
    --bg-black: #000000;
    --bg-dark: #1a1a1a;
    --bg-card: #333333;
    --text-white: #ffffff;
    --text-gray: #cccccc;
    --text-muted: #888888;
    --orange: #ff9500;
    --green: #34c759;
    --red: #ff3b30;
    --border: #444444;
    
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    --radius: 12px;
    --radius-lg: 20px;
    
    --header-height: 60px;
    --bottom-nav-height: 70px;
}

/* Base */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-black);
    color: var(--text-white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-black);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--bg-card);
    border-top: 3px solid var(--orange);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-lg);
}

.loading-screen h2 {
    font-size: 32px;
    font-weight: 600;
    color: var(--text-white);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* App Container */
.app {
    height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--bg-black);
    position: relative;
}

/* Top Header */
.top-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
    background: var(--bg-black);
    position: relative;
    z-index: 200;
}

.header-spacer {
    flex: 1;
}

/* Hamburger Menu */
.hamburger-menu {
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: var(--spacing-sm);
}

.hamburger-menu span {
    width: 20px;
    height: 2px;
    background: var(--text-white);
    transition: all 0.3s ease;
}

.hamburger-menu.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger-menu.active span:nth-child(2) {
    opacity: 0;
}

.hamburger-menu.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Hamburger Dropdown */
.hamburger-dropdown {
    position: absolute;
    top: var(--header-height);
    right: 0;
    background: var(--bg-dark);
    border-radius: var(--radius) 0 0 var(--radius);
    min-width: 200px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
    transform: translateY(-20px);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 150;
}

.hamburger-dropdown.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
}

.menu-item {
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: background 0.2s ease;
    border-bottom: 1px solid var(--border);
}

.menu-item:last-child {
    border-bottom: none;
}

.menu-item:hover {
    background: var(--bg-card);
}

.menu-item.signout {
    color: var(--red);
}

/* Screen Container */
.screen-container {
    flex: 1;
    position: relative;
    overflow: hidden;
}

/* Screens */
.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-black);
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    overflow-y: auto;
    padding: var(--spacing-lg);
    padding-bottom: calc(var(--bottom-nav-height) + var(--spacing-lg));
}

.screen.active {
    transform: translateX(0);
}

.screen.slide-out-left {
    transform: translateX(-100%);
}

/* Screen Header */
.screen-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border);
}

.back-btn {
    background: none;
    border: none;
    color: var(--text-white);
    font-size: 24px;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius);
    transition: all 0.2s ease;
}

.back-btn:hover {
    background: var(--bg-card);
}

.screen-header h2 {
    font-size: 24px;
    font-weight: 600;
}

/* Main Dashboard - Two Tiles */
.main-tiles {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl) 0;
}

/* Media Section */
.media-section {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
}

.media-section h2 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-white);
}

.main-tile {
    flex: 1;
    background: var(--bg-card);
    border: none;
    border-radius: var(--radius-lg);
    color: var(--text-white);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-xl);
    min-height: 120px;
}

.main-tile:active {
    transform: scale(0.98);
    background: var(--bg-dark);
}

.tile-text {
    font-size: 28px;
    font-weight: 600;
}

.tile-icon {
    font-size: 32px;
}

.send-tile:hover {
    background: #444;
}

.request-tile:hover {
    background: #444;
}

/* Media Selection */
.media-select {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    cursor: pointer;
    transition: all 0.2s ease;
}

.media-select:active {
    background: var(--bg-dark);
    transform: scale(0.98);
}

.select-icon {
    width: 24px;
    height: 24px;
    background: var(--orange);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
    font-weight: bold;
}

/* Amount Display */
.amount-section {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.amount-display {
    padding: var(--spacing-lg) 0;
}

.dollar, .amount {
    font-size: 42px;
    font-weight: 300;
    color: var(--text-white);
}

/* Keypad */
.keypad {
    margin-bottom: var(--spacing-xl);
}

.keypad-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    max-width: 280px;
    margin: 0 auto;
}

.key {
    height: 55px;
    background: none;
    border: none;
    color: var(--text-white);
    font-size: 22px;
    font-weight: 300;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.key:active {
    background: var(--bg-dark);
    transform: scale(0.95);
}

.key.backspace {
    color: var(--text-muted);
}

/* Action Buttons */
.action-button {
    width: 100%;
    background: var(--bg-card);
    border: none;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    color: var(--text-white);
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: auto;
}

.action-button:active {
    background: var(--bg-dark);
    transform: scale(0.98);
}

.arrow {
    width: 32px;
    height: 32px;
    background: var(--text-white);
    color: var(--bg-black);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}

.qr-button {
    background: var(--green);
    margin-top: var(--spacing-md);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.7);
}

.modal-content {
    background-color: var(--bg-card);
    margin: 15% auto;
    padding: var(--spacing-xl);
    border: 1px solid var(--border);
    width: 80%;
    max-width: 400px;
    border-radius: var(--radius-lg);
    text-align: center;
    position: relative;
}

.close-btn {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-lg);
    color: var(--text-muted);
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close-btn:hover,
.close-btn:focus {
    color: var(--text-white);
}

#qrcode-container {
    margin: var(--spacing-lg) 0;
}

#qrcode-container img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
}

/* Search */
.user-search, .search-bar {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.user-search input, .search-bar input {
    flex: 1;
    background: var(--bg-card);
    border: none;
    padding: var(--spacing-md);
    border-radius: var(--radius);
    color: var(--text-white);
    font-size: 16px;
}

.user-search input::placeholder, .search-bar input::placeholder {
    color: var(--text-muted);
}

.search-btn {
    background: var(--bg-card);
    border: none;
    padding: var(--spacing-md);
    border-radius: var(--radius);
    color: var(--text-white);
    cursor: pointer;
    transition: background 0.2s ease;
}

.search-btn:hover {
    background: var(--bg-dark);
}

/* Profile */
.profile-info {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    overflow: hidden;
    margin: 0 auto var(--spacing-md);
    border: 3px solid var(--bg-card);
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile-info h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.stats {
    color: var(--text-gray);
    font-size: 16px;
}

.profile-settings {
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
}

.setting-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: background 0.2s ease;
}

.setting-row:last-child {
    border-bottom: none;
}

.setting-row:active {
    background: var(--bg-dark);
}

.chevron {
    color: var(--text-muted);
    font-size: 18px;
}

/* Transactions */
.filter-bar {
    display: flex;
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 4px;
    margin-bottom: var(--spacing-lg);
}

.filter-btn {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-gray);
    padding: var(--spacing-sm);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 14px;
}

.filter-btn.active {
    background: var(--bg-black);
    color: var(--text-white);
}

/* Empty States */
.empty-transactions, .empty-search {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-gray);
}

.empty-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-lg);
}

.empty-transactions h3, .empty-search h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-white);
}

/* Bottom Navigation */
.bottom-nav {
    height: var(--bottom-nav-height);
    background: var(--bg-dark);
    border-top: 1px solid var(--border);
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 100;
}

.nav-btn {
    flex: 1;
    background: none;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-muted);
}

.nav-btn.active {
    color: var(--orange);
}

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

/* Toast */
.toast {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    background: var(--bg-card);
    color: var(--text-white);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius);
    font-size: 14px;
    z-index: 1000;
    transform: translateX(100%);
    transition: transform 0.3s ease;
}

.toast.show {
    transform: translateX(0);
}

.toast.success {
    background: var(--green);
}

.toast.error {
    background: var(--red);
}

/* Responsive */
@media (max-width: 480px) {
    .screen {
        padding: var(--spacing-md);
        padding-bottom: calc(var(--bottom-nav-height) + var(--spacing-md));
    }
    
    .keypad-grid {
        max-width: 260px;
    }
    
    .key {
        height: 50px;
        font-size: 20px;
    }
    
    .dollar, .amount {
        font-size: 36px;
    }
    
    .tile-text {
        font-size: 24px;
    }
    
    .tile-icon {
        font-size: 28px;
    }
}

/* Utility */
.hidden {
    display: none !important;
}

/* Desktop Styles */
@media screen and (min-width: 768px) {
  .app {
    flex-direction: row;
  }

  .top-header, .hamburger-menu, .hamburger-dropdown {
    display: none;
  }

  .bottom-nav {
    position: static;
    flex-direction: column;
    width: 240px;
    height: 100vh;
    border-top: none;
    border-right: 1px solid var(--border);
    background: var(--bg-dark);
    padding: var(--spacing-lg);
    z-index: 100;
  }

  .nav-btn {
    flex: none;
    justify-content: flex-start;
    padding: var(--spacing-md);
    font-size: 16px;
    border-radius: var(--radius);
    margin-bottom: var(--spacing-sm);
  }

  .nav-btn.active {
    background: var(--bg-card);
  }

  .screen-container {
    flex: 1;
    height: 100vh;
    overflow-y: auto;
  }

  .screen {
    padding: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
  }

  .main-tiles {
    flex-direction: row;
  }

  .keypad, .amount-display {
    display: none;
  }

  .desktop-amount-input {
    display: block;
    margin: var(--spacing-lg) 0;
  }

  .desktop-amount-input input {
    width: 100%;
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: var(--spacing-md);
    border-radius: var(--radius);
    color: var(--text-white);
    font-size: 16px;
    text-align: center;
  }
}