/* CSS Variables - Light Theme */
:root {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --accent-primary: #3b82f6;
    --accent-primary-hover: #2563eb;
    --accent-green: #10b981;
    --accent-green-bg: rgba(16, 185, 129, 0.1);
    --accent-red: #ef4444;
    --accent-red-bg: rgba(239, 68, 68, 0.1);
    --accent-orange: #f59e0b;
    --accent-orange-bg: rgba(245, 158, 11, 0.1);
    --accent-blue-bg: rgba(59, 130, 246, 0.1);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --transition: 0.2s ease;
}

/* Dark Theme */
.dark {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    --border-color: #334155;
    --accent-primary: #60a5fa;
    --accent-primary-hover: #3b82f6;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

#app {
    max-width: 100%;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    gap: 12px;
}

header h1 {
    flex: 1;
    font-size: 1.125rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    color: var(--text-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition);
    flex-shrink: 0;
}

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

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

/* Screens */
.screen {
    display: none;
    flex: 1;
    padding: 16px;
    overflow-y: auto;
}

.screen.active {
    display: block;
}

/* Menu Screen */
.menu-hero {
    text-align: center;
    padding: 32px 16px;
}

.hero-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: var(--accent-blue-bg);
    color: var(--accent-primary);
    font-size: 2rem;
    font-weight: 700;
    border-radius: 16px;
    margin-bottom: 16px;
}

.menu-hero h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.menu-hero p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.menu-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-width: 400px;
    margin: 0 auto;
}

.menu-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition);
}

.menu-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-1px);
}

.menu-card:active {
    transform: scale(0.98);
}

.menu-card-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.menu-card-icon.green {
    background: var(--accent-green-bg);
    color: var(--accent-green);
}

.menu-card-icon.blue {
    background: var(--accent-blue-bg);
    color: var(--accent-primary);
}

.menu-card-icon.orange {
    background: var(--accent-orange-bg);
    color: var(--accent-orange);
}

.menu-card-content h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 2px;
}

.menu-card-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    font-size: 0.9375rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

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

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

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

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

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

.btn-danger {
    background: var(--accent-red-bg);
    color: var(--accent-red);
}

.btn-success {
    background: var(--accent-green-bg);
    color: var(--accent-green);
}

.btn-large {
    width: 100%;
    padding: 16px 24px;
    font-size: 1rem;
}

.btn-small {
    padding: 8px 12px;
    font-size: 0.8125rem;
}

/* Form */
.form-container {
    max-width: 400px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.form-group textarea,
.form-group input {
    width: 100%;
    padding: 12px 14px;
    font-size: 1rem;
    font-family: inherit;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    resize: vertical;
    transition: border-color var(--transition);
}

.form-group textarea:focus,
.form-group input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.hint {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-top: 6px;
}

.form-examples {
    background: var(--bg-tertiary);
    padding: 12px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
}

.form-examples .examples-title {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-examples code {
    display: block;
    font-family: 'SF Mono', Monaco, Consolas, monospace;
    font-size: 0.8125rem;
    color: var(--text-primary);
    padding: 4px 0;
}

/* Deals List */
.deals-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.deal-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 16px;
    cursor: pointer;
    transition: all var(--transition);
}

.deal-card:hover {
    border-color: var(--accent-primary);
}

.deal-card:active {
    transform: scale(0.99);
}

.deal-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.deal-card-title {
    display: flex;
    align-items: center;
    gap: 8px;
}

.deal-card-title h3 {
    font-size: 1rem;
    font-weight: 600;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: 999px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.deal-card-date {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.deal-card-stats {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.deal-card-stat {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.875rem;
}

.deal-card-stat.positive {
    color: var(--accent-green);
}

.deal-card-stat.negative {
    color: var(--accent-red);
}

.deal-card-stat .positive,
.deal-card-stat svg.positive {
    color: var(--accent-green);
}

.deal-card-stat .negative,
.deal-card-stat svg.negative {
    color: var(--accent-red);
}

.badge-closed {
    display: inline-block;
    padding: 2px 8px;
    background: var(--accent-red);
    color: white;
    border-radius: 4px;
    font-size: 12px;
    margin-left: 8px;
}

.deal-card-rate {
    text-align: right;
}

.deal-card-rate .value {
    font-size: 1.125rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.deal-card-rate .label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Deal Detail */
.deal-detail {
    max-width: 500px;
    margin: 0 auto;
}

.detail-header {
    text-align: center;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
}

.detail-header h2 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.detail-header .meta {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.detail-summary {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 16px;
    margin-bottom: 20px;
}

.summary-main {
    text-align: center;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 16px;
}

.summary-main .rate {
    font-size: 2rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.summary-main .formula {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
    margin-top: 4px;
}

.summary-balance {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.balance-item {
    text-align: center;
    padding: 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.balance-item .label {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.balance-item .value {
    font-size: 1rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

.balance-item .value.positive {
    color: var(--accent-green);
}

.balance-item .value.negative {
    color: var(--accent-red);
}

.detail-actions {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
}

.detail-actions .btn {
    flex: 1;
}

.detail-history h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.operation-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    margin-bottom: 8px;
    font-variant-numeric: tabular-nums;
}

.operation-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.operation-badge.sale {
    background: var(--accent-orange-bg);
    color: var(--accent-orange);
}

.operation-badge.buy {
    background: var(--accent-green-bg);
    color: var(--accent-green);
}

.operation-badge.open {
    background: var(--accent-blue-bg);
    color: var(--accent-primary);
}

.operation-date {
    font-size: 0.8125rem;
    color: var(--text-muted);
    width: 40px;
    flex-shrink: 0;
}

.operation-values {
    flex: 1;
    font-size: 0.875rem;
}

.operation-values .amount {
    font-weight: 500;
}

.operation-values .muted {
    color: var(--text-muted);
}

/* Stats */
.stats-content {
    max-width: 400px;
    margin: 0 auto;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 20px;
}

.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 16px;
}

.stat-card.full {
    grid-column: 1 / -1;
}

.stat-card .label {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.stat-card .value {
    font-size: 1.25rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.stat-card .value.positive {
    color: var(--accent-green);
}

.stat-card .value.negative {
    color: var(--accent-red);
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: flex;
    align-items: flex-end;
    justify-content: center;
}

.modal.hidden {
    display: none;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 400px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    padding: 24px;
    padding-bottom: calc(24px + env(safe-area-inset-bottom, 0px));
}

.modal-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.modal-buttons {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}

.modal-buttons .btn {
    flex: 1;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 48px 24px;
}

.empty-state-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: var(--bg-tertiary);
    border-radius: 50%;
    margin-bottom: 16px;
    color: var(--text-muted);
}

.empty-state h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.empty-state p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    max-width: 280px;
    margin: 0 auto 20px;
}

/* Loading */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 48px;
    color: var(--text-muted);
}

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

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { transform: translateY(100%); }
    to { transform: translateY(0); }
}

.modal-content {
    animation: slideUp 0.3s ease;
}

/* Safe area for mobile */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
    .screen {
        padding-bottom: calc(16px + env(safe-area-inset-bottom));
    }
}