/* ==============================================
   Professional Expense Tracker - Clean Minimalist Design
   Color Palette: Black, White, Grays
   ============================================== */

:root {
    /* Color Palette */
    --color-black: #000000;
    --color-white: #FFFFFF;
    --color-gray-50: #FAFAFA;
    --color-gray-100: #F5F5F5;
    --color-gray-200: #E5E5E5;
    --color-gray-300: #D4D4D4;
    --color-gray-400: #A3A3A3;
    --color-gray-500: #737373;
    --color-gray-600: #525252;
    --color-gray-700: #404040;
    --color-gray-800: #262626;
    --color-gray-900: #171717;
    
    /* Typography */
    --font-display: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
    --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

/* ==============================================
   Base Styles
   ============================================== */

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

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

body {
    font-family: var(--font-body);
    background-color: var(--color-gray-50);
    color: var(--color-gray-900);
    line-height: 1.6;
}

/* ==============================================
   Layout
   ============================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* ==============================================
   Header & Navigation
   ============================================== */

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-gray-200);
}

.header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-black);
    letter-spacing: -0.02em;
}

.nav {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--color-gray-600);
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

/* ==============================================
   Form Elements
   ============================================== */

.expense-form,
.config-form {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    max-width: 600px;
}

.form-section {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.text-input,
.amount-input,
.project-select,
.description-input {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    font-family: var(--font-body);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    background: var(--color-white);
    color: var(--color-gray-900);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.text-input:focus,
.amount-input:focus,
.project-select:focus,
.description-input:focus {
    outline: none;
    border-color: var(--color-gray-900);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.05);
}

.description-input {
    resize: vertical;
    min-height: 80px;
}

.field-hint {
    margin-top: var(--spacing-xs);
    font-size: 0.8125rem;
    color: var(--color-gray-500);
}

/* ==============================================
   Photo Upload
   ============================================== */

.photo-upload-area {
    position: relative;
    border: 2px dashed var(--color-gray-300);
    border-radius: var(--radius-lg);
    background: var(--color-gray-50);
    overflow: hidden;
    transition: border-color 0.2s ease, background-color 0.2s ease;
}

.photo-upload-area:hover {
    border-color: var(--color-gray-400);
    background: var(--color-white);
}

.photo-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.upload-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    min-height: 200px;
}

.upload-icon {
    width: 48px;
    height: 48px;
    color: var(--color-gray-400);
    margin-bottom: var(--spacing-sm);
}

.upload-text {
    font-size: 0.9375rem;
    color: var(--color-gray-600);
    font-weight: 500;
}

.photo-preview {
    position: relative;
    padding: var(--spacing-sm);
}

.photo-preview img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    display: block;
}

.remove-photo {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--color-white);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-gray-700);
    cursor: pointer;
    transition: all 0.2s ease;
}

.remove-photo:hover {
    background: var(--color-gray-900);
    color: var(--color-white);
    border-color: var(--color-gray-900);
}

/* ==============================================
   Amount Input
   ============================================== */

.amount-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.currency-symbol {
    position: absolute;
    left: 1rem;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-gray-900);
    pointer-events: none;
}

.amount-input {
    padding-left: 2.5rem;
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

/* ==============================================
   Project Selector
   ============================================== */

.project-selector {
    display: flex;
    gap: var(--spacing-sm);
}

.project-select {
    flex: 1;
}

.add-project-btn {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-gray-900);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.add-project-btn:hover {
    background: var(--color-black);
}

.add-project-btn svg {
    width: 20px;
    height: 20px;
    color: var(--color-white);
    stroke-width: 2.5;
}

/* ==============================================
   Buttons
   ============================================== */

.submit-btn,
.btn-primary {
    width: 100%;
    padding: 1rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-white);
    background: var(--color-black);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.submit-btn:hover,
.btn-primary:hover {
    background: var(--color-gray-900);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.submit-btn:active,
.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-gray-900);
    background: var(--color-white);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-secondary:hover {
    border-color: var(--color-gray-900);
    background: var(--color-gray-50);
}

.btn-loader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.loader {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--color-white);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* ==============================================
   Dashboard Stats
   ============================================== */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.stat-label {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-gray-600);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-black);
    letter-spacing: -0.02em;
}

/* ==============================================
   Sections
   ============================================== */

.section {
    margin-bottom: var(--spacing-xl);
}

.section-header {
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-black);
    letter-spacing: -0.01em;
}

.section-description {
    font-size: 0.9375rem;
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-md);
}

/* ==============================================
   Projects Grid
   ============================================== */

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.project-card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all 0.2s ease;
}

.project-card:hover {
    border-color: var(--color-gray-400);
    box-shadow: var(--shadow-md);
}

.project-name {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-xs);
}

.project-amount {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-black);
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.02em;
}

.project-count {
    font-size: 0.875rem;
    color: var(--color-gray-500);
    margin-bottom: var(--spacing-md);
}

.project-link {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-gray-900);
    text-decoration: none;
    border-bottom: 1px solid var(--color-gray-900);
    transition: opacity 0.2s ease;
}

.project-link:hover {
    opacity: 0.7;
}

/* ==============================================
   Expenses List
   ============================================== */

.expenses-list {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.expense-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-gray-200);
    transition: background-color 0.2s ease;
}

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

.expense-item:hover {
    background: var(--color-gray-50);
}

.expense-photo {
    flex-shrink: 0;
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--color-gray-100);
}

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

.no-photo {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.no-photo svg {
    width: 24px;
    height: 24px;
    color: var(--color-gray-400);
    stroke-width: 1.5;
}

.expense-details {
    flex: 1;
    min-width: 0;
}

.expense-project {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: 0.25rem;
}

.expense-description {
    font-size: 0.875rem;
    color: var(--color-gray-600);
    margin-bottom: 0.25rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.expense-date {
    font-size: 0.75rem;
    color: var(--color-gray-500);
}

.expense-amount {
    flex-shrink: 0;
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-black);
    letter-spacing: -0.01em;
}

/* ==============================================
   Modal
   ============================================== */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 500px;
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.modal-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-black);
}

.modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    cursor: pointer;
    transition: background-color 0.2s ease;
    border-radius: var(--radius-sm);
}

.modal-close:hover {
    background: var(--color-gray-100);
}

.modal-close svg {
    width: 20px;
    height: 20px;
    color: var(--color-gray-600);
}

.modal-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.modal-actions button {
    flex: 1;
}

/* ==============================================
   Configuration
   ============================================== */

.config-card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.connection-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.connection-status.connected {
    background: var(--color-gray-50);
    border: 1px solid var(--color-gray-200);
}

.connection-status.disconnected {
    background: var(--color-gray-100);
    border: 1px solid var(--color-gray-300);
}

.status-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    color: var(--color-gray-700);
}

.status-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: 0.25rem;
}

.status-email,
.status-description {
    font-size: 0.875rem;
    color: var(--color-gray-600);
}

.radio-group {
    display: flex;
    gap: var(--spacing-sm);
}

.radio-option {
    flex: 1;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.radio-option:hover {
    border-color: var(--color-gray-900);
    background: var(--color-gray-50);
}

.radio-option input[type="radio"] {
    margin: 0;
    cursor: pointer;
}

.radio-option input[type="radio"]:checked + span {
    font-weight: 600;
}

.projects-folders {
    display: grid;
    gap: var(--spacing-sm);
}

.folder-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--color-gray-50);
    border-radius: var(--radius-md);
}

.folder-icon {
    width: 20px;
    height: 20px;
    color: var(--color-gray-600);
    stroke-width: 2;
}

/* ==============================================
   Messages
   ============================================== */

.form-message {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    font-weight: 500;
}

.form-message.success {
    background: var(--color-gray-100);
    color: var(--color-gray-900);
    border: 1px solid var(--color-gray-300);
}

.form-message.error {
    background: var(--color-gray-900);
    color: var(--color-white);
    border: 1px solid var(--color-black);
}

.test-result {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
}

.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-gray-600);
}

.empty-state p {
    margin-bottom: var(--spacing-md);
    font-size: 0.9375rem;
}

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

@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }
    
    .header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .nav {
        width: 100%;
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .expense-item {
        flex-wrap: wrap;
    }
    
    .expense-amount {
        width: 100%;
        text-align: right;
        margin-top: var(--spacing-xs);
    }
}