:root {
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --bg-card: #1f1f1f;
    --bg-hover: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    --accent: #6366f1;
    --accent-light: #818cf8;
    --accent-dark: #4f46e5;
    --success: #22c55e;
    --success-light: #4ade80;
    --danger: #ef4444;
    --danger-light: #f87171;
    --border-color: rgba(255, 255, 255, 0.08);
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --bg-card: #ffffff;
    --bg-hover: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: rgba(0, 0, 0, 0.06);
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    transition: background 0.3s, color 0.3s;
    -webkit-font-smoothing: antialiased;
}

#app {
    min-height: 100vh;
    padding-bottom: 20px;
}

.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    flex-direction: column;
    gap: 16px;
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.screen {
    padding: 20px;
    animation: fadeIn 0.25s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.header {
    text-align: center;
    margin-bottom: 32px;
    position: relative;
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.header .subtitle {
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 400;
}

.header-controls {
    position: absolute;
    top: 0;
    right: 0;
}

.theme-toggle {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 10px 12px;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.2s;
}

.theme-toggle:hover {
    background: var(--bg-hover);
    color: var(--accent);
}

.period-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--accent);
    border-radius: 100px;
    padding: 8px 16px;
    font-size: 0.8rem;
    font-weight: 500;
    margin-top: 16px;
    color: white;
}

.menu-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 16px 20px;
    border: none;
    border-radius: 14px;
    background: var(--bg-card);
    font-size: 0.95rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-primary);
    box-shadow: var(--shadow);
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    color: white;
}

.btn-primary:hover {
    opacity: 0.9;
}

.btn-success {
    background: var(--success);
    color: white;
}

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

.btn-danger {
    background: var(--danger);
    color: white;
}

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

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    box-shadow: none;
}

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

[data-theme="light"] .btn {
    background: transparent;
    border: 1px solid var(--border-color);
    box-shadow: none;
}

[data-theme="light"] .btn-primary {
    background: transparent;
    border: 2px solid var(--accent);
    color: var(--accent);
}

[data-theme="light"] .btn-primary:hover {
    background: var(--accent);
    color: white;
    opacity: 1;
}

[data-theme="light"] .btn-success {
    background: transparent;
    border: 2px solid var(--success);
    color: var(--success);
}

[data-theme="light"] .btn-success:hover {
    background: var(--success);
    color: white;
}

[data-theme="light"] .btn-danger {
    background: transparent;
    border: 2px solid var(--danger);
    color: var(--danger);
}

[data-theme="light"] .btn-danger:hover {
    background: var(--danger);
    color: white;
}

[data-theme="light"] .btn-secondary {
    background: transparent;
    border: 1px solid var(--border-color);
}

[data-theme="light"] .btn-secondary:hover {
    border-color: var(--text-secondary);
}

.btn-back {
    background: transparent;
    box-shadow: none;
    color: var(--accent);
    padding: 8px 0;
    justify-content: flex-start;
    font-size: 0.9rem;
    font-weight: 500;
}

.btn-back:hover {
    color: var(--accent-light);
}

.btn-icon {
    font-size: 1.1rem;
}

.input-group {
    margin-bottom: 24px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
}

.input-group input {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.input-group input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

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

.recipient-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.recipient-btn {
    padding: 18px 16px;
    border: none;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    color: white;
    font-size: 0.95rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 14px;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.recipient-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.recipient-btn:nth-child(2) {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
}

.recipient-btn:nth-child(2):hover {
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
}

.recipient-btn:nth-child(3) {
    background: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
    box-shadow: 0 4px 12px rgba(6, 182, 212, 0.3);
}

.recipient-btn:nth-child(3):hover {
    box-shadow: 0 6px 20px rgba(6, 182, 212, 0.4);
}

.recipient-btn .icon {
    font-size: 1.25rem;
}

[data-theme="light"] .recipient-btn {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    color: white;
}

[data-theme="light"] .recipient-btn:nth-child(2) {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
}

[data-theme="light"] .recipient-btn:nth-child(3) {
    background: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
}

.delete-menu {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.record-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 16px;
}

.record-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 16px;
    background: var(--bg-card);
    border-radius: 12px;
    transition: all 0.2s;
}

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

.record-info {
    flex: 1;
}

.record-info .recipient {
    font-weight: 500;
    margin-bottom: 2px;
}

.record-info .details {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.record-amount {
    font-weight: 600;
    color: var(--accent);
    margin-right: 12px;
    font-size: 1rem;
}

.delete-btn {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 10px;
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.delete-btn:hover {
    background: var(--danger);
    color: white;
}

.slides-wrapper {
    overflow: hidden;
    margin: 0 -20px;
    touch-action: pan-y pinch-zoom;
}

.slides-container {
    display: flex;
    transition: transform 0.3s ease;
    will-change: transform;
}

.slide {
    min-width: 100%;
    flex-shrink: 0;
    padding: 0 20px;
    box-sizing: border-box;
}

.slide-content {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 20px;
    box-shadow: var(--shadow);
}

.slide-content h2 {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    font-size: 1.1rem;
}

.chart-container {
    height: 150px;
    margin-bottom: 20px;
    padding: 12px;
    background: var(--bg-secondary);
    border-radius: 14px;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 16px;
}

.stats-summary {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 14px;
    background: var(--bg-secondary);
    border-radius: 12px;
}

.stat-item .label {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.stat-item .value {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.stat-card {
    background: var(--bg-secondary);
    border-radius: 14px;
    padding: 16px;
    text-align: center;
}

.stat-card .value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.stat-card .label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    font-weight: 500;
    letter-spacing: 0.5px;
}

.stat-card.primary {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    grid-column: span 2;
}

.stat-card.primary .value,
.stat-card.primary .label {
    color: white;
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 20px;
}

.pagination .dot {
    width: 8px;
    height: 8px;
    border-radius: 100px;
    background: var(--border-color);
    transition: all 0.3s;
}

.pagination .dot.active {
    background: var(--accent);
    width: 24px;
}

.user-slide {
    border-left: 4px solid var(--accent);
    border-radius: 20px 20px 20px 16px;
}

.user-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 16px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.user-avatar {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 600;
    color: white;
}

.user-info h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 2px;
}

.user-total {
    color: var(--accent);
    font-weight: 600;
    font-size: 0.9rem;
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
}

.empty-state .icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
    opacity: 0.4;
}

.success-message {
    text-align: center;
    padding: 40px 20px;
    background: linear-gradient(180deg, rgba(34, 197, 94, 0.1) 0%, transparent 100%);
    border-radius: 20px;
    margin-top: 20px;
}

.success-message .icon {
    font-size: 4rem;
    margin-bottom: 16px;
    animation: bounce 0.6s ease;
}

@keyframes bounce {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

.success-message h2 {
    margin-bottom: 8px;
    font-weight: 600;
    background: linear-gradient(135deg, var(--success) 0%, #10b981 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.success-message .details {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.success-message .amount {
    font-size: 2rem;
    font-weight: 700;
    color: var(--success);
    margin-bottom: 8px;
}

.swipe-hint {
    text-align: center;
    margin-top: 16px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.unauthorized {
    text-align: center;
    padding: 60px 20px;
}

.unauthorized .icon {
    font-size: 3.5rem;
    margin-bottom: 20px;
}

.unauthorized h2 {
    margin-bottom: 8px;
    font-weight: 600;
}

.unauthorized p {
    color: var(--text-secondary);
}

.divider {
    height: 1px;
    background: var(--border-color);
    margin: 16px 0;
}

.section-title {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 10px;
    margin-top: 16px;
}

.section-title:first-child {
    margin-top: 0;
}

.archive-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.archive-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    background: var(--bg-card);
    border-radius: 14px;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: all 0.2s;
}

.archive-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.archive-item:active {
    transform: scale(0.98);
}

.archive-info {
    flex: 1;
}

.archive-dates {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.archive-stats {
    display: flex;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.archive-actions {
    margin-left: 12px;
}

.excel-btn {
    width: 44px;
    height: 44px;
    border: none;
    border-radius: 12px;
    background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    box-shadow: 0 2px 8px rgba(34, 197, 94, 0.3);
}

.excel-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(34, 197, 94, 0.4);
}

.excel-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.history-pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-top: 20px;
    padding: 12px;
}

.page-info {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.btn-sm {
    padding: 10px 16px;
    font-size: 0.875rem;
}

.archive-summary {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: var(--shadow);
}