/* HypBudget - Professional Dark Theme Styles */
:root {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-tertiary: #0f3460;
    --text-primary: #ffffff;
    --text-secondary: #b8b8b8;
    --accent-primary: #e94560;
    --accent-secondary: #533483;
    --border-color: #2a2a4a;
    --success-color: #00d26a;
    --warning-color: #ffc107;
    --danger-color: #ff4757;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    --edit-highlight: #2d5a87;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Login Modal */
.login-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.login-container {
    background: var(--bg-secondary);
    padding: 3rem;
    border-radius: 16px;
    box-shadow: var(--shadow);
    border: 2px solid var(--accent-primary);
    max-width: 400px;
    width: 90%;
    text-align: center;
}

.login-title {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.login-subtitle {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.login-input {
    width: 100%;
    padding: 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.login-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 10px rgba(233, 69, 96, 0.3);
}

.login-button {
    background: var(--accent-primary);
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(233, 69, 96, 0.3);
}

.login-button:hover {
    background: #ff6b6b;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(233, 69, 96, 0.4);
}

.login-error {
    color: var(--danger-color);
    font-size: 0.9rem;
    margin-top: 1rem;
    display: none;
}

.login-error.visible {
    display: block;
}

/* Hide main content when not authenticated */
.hidden {
    display: none !important;
}

/* Header Styles */
.header {
    background: var(--bg-secondary);
    padding: 1rem 2rem;
    border-bottom: 2px solid var(--accent-primary);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 2rem;
    font-weight: bold;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo span {
    color: var(--accent-primary);
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
    font-weight: 500;
}

.nav-link:hover {
    color: var(--accent-primary);
}

/* Main Content */
.main-content {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 0 2rem;
}

/* Upload Section */
.upload-section {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.upload-area {
    border: 2px dashed var(--accent-secondary);
    border-radius: 8px;
    padding: 3rem;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
}

.upload-area:hover {
    border-color: var(--accent-primary);
    background: var(--bg-tertiary);
}

.upload-area.dragover {
    border-color: var(--accent-primary);
    background: var(--bg-tertiary);
    transform: scale(1.02);
}

.upload-icon {
    font-size: 4rem;
    color: var(--accent-secondary);
    margin-bottom: 1rem;
}

.upload-text {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.upload-button {
    background: var(--accent-primary);
    color: white;
    border: none;
    padding: 0.8rem 2rem;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(233, 69, 96, 0.3);
}

.upload-button:hover {
    background: #ff6b6b;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(233, 69, 96, 0.4);
}

.file-input {
    display: none;
}

/* Toolbar */
.toolbar {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    align-items: center;
    border: 1px solid var(--border-color);
}

.toolbar-group {
    display: flex;
    gap: 0.5rem;
    padding-right: 1rem;
    border-right: 1px solid var(--border-color);
}

.toolbar-group:last-child {
    border-right: none;
}

.toolbar-button {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.toolbar-button:hover {
    background: var(--accent-secondary);
    border-color: var(--accent-primary);
}

.toolbar-button.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

/* Formula Bar */
.formula-bar {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 0.8rem;
    margin-bottom: 1rem;
    display: flex;
    gap: 1rem;
    align-items: center;
    border: 1px solid var(--border-color);
}

.formula-label {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.9rem;
    min-width: 80px;
}

.formula-input {
    flex: 1;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.5rem;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.formula-input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

/* Spreadsheet Container */
.spreadsheet-container {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    display: none;
}

.spreadsheet-container.active {
    display: block;
}

.spreadsheet-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.spreadsheet-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.spreadsheet-actions {
    display: flex;
    gap: 1rem;
}

.action-button {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.action-button:hover {
    background: var(--accent-secondary);
    border-color: var(--accent-primary);
}

/* Table Styles */
.spreadsheet-wrapper {
    overflow-x: auto;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.spreadsheet-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-primary);
    font-size: 0.9rem;
}

.spreadsheet-table th,
.spreadsheet-table td {
    padding: 12px 16px;
    text-align: left;
    border: 1px solid var(--border-color);
    white-space: nowrap;
}

.spreadsheet-table th {
    background: var(--bg-tertiary);
    color: var(--accent-primary);
    font-weight: 600;
    position: sticky;
    top: 0;
    z-index: 10;
}

.spreadsheet-table tbody tr:nth-child(even) {
    background: var(--bg-secondary);
}

.spreadsheet-table tbody tr:hover {
    background: var(--bg-tertiary);
}

.spreadsheet-table td {
    color: var(--text-secondary);
}

/* Editable cells */
.spreadsheet-table td[contenteditable="true"] {
    cursor: pointer;
    transition: background 0.2s ease;
}

.spreadsheet-table td[contenteditable="true"]:hover {
    background: var(--edit-highlight);
}

.spreadsheet-table td[contenteditable="true"]:focus {
    outline: 2px solid var(--accent-primary);
    background: var(--bg-tertiary);
}

.spreadsheet-table td.editing {
    background: var(--edit-highlight);
    outline: 2px solid var(--accent-primary);
}

/* Selected cell */
.spreadsheet-table td.selected {
    background: var(--edit-highlight);
    outline: 2px solid var(--accent-primary);
}

/* Sheet Tabs */
.sheet-tabs {
    display: flex;
    gap: 0.5rem;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    overflow-x: auto;
}

.sheet-tab {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.sheet-tab:hover {
    background: var(--accent-secondary);
    color: var(--text-primary);
}

.sheet-tab.active {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
}

/* Loading Spinner */
.loading {
    display: none;
    text-align: center;
    padding: 3rem;
}

.loading.active {
    display: block;
}

.spinner {
    border: 4px solid var(--bg-tertiary);
    border-top: 4px solid var(--accent-primary);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

.loading-text {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Status Bar */
.status-bar {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 0.8rem 1.5rem;
    margin-top: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    border: 1px solid var(--border-color);
}

.status-info {
    color: var(--text-secondary);
    display: flex;
    gap: 2rem;
}

.status-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.status-label {
    font-weight: 600;
    color: var(--accent-primary);
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    padding: 2rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
    margin-top: 3rem;
}

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

/* Keyboard shortcuts help */
.shortcuts-help {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 1.5rem;
    margin-top: 1rem;
    border: 1px solid var(--border-color);
}

.shortcuts-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--accent-primary);
}

.shortcuts-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 0.5rem;
}

.shortcut-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem;
    border-radius: 4px;
    background: var(--bg-secondary);
}

.shortcut-key {
    background: var(--bg-primary);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.85rem;
    border: 1px solid var(--border-color);
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        gap: 1rem;
    }
    
    .upload-section {
        padding: 1.5rem;
    }
    
    .upload-area {
        padding: 2rem 1rem;
    }
    
    .spreadsheet-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
    
    .main-content {
        padding: 0 1rem;
    }
}

/* Print Styles */
@media print {
    .header,
    .upload-section,
    .spreadsheet-actions,
    .sheet-tabs,
    .footer {
        display: none;
    }
    
    .main-content {
        margin: 0;
        padding: 0;
    }
    
    .spreadsheet-container {
        box-shadow: none;
        border: none;
        padding: 0;
    }
    
    .spreadsheet-table {
        font-size: 8pt;
    }
    
    body {
        background: white;
        color: black;
    }
}