/* ========================================
   MODERN FULL-PAGE EXPENSE TRACKER STYLES
   ======================================== */

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

:root {
    /* Light Theme */
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --secondary: #8b5cf6;
    --accent: #06b6d4;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    
    --bg: #f1f5f9;
    --bg-secondary: #ffffff;
    --card-bg: #ffffff;
    --text: #0f172a;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(99, 102, 241, 0.12);
    --shadow-lg: 0 10px 40px rgba(99, 102, 241, 0.15);
    --shadow-hover: 0 8px 24px rgba(99, 102, 241, 0.18);
    
    --radius: 16px;
    --radius-sm: 8px;
    --radius-lg: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Auth Modal Styles */
.auth-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
}

.auth-modal-content {
    background: var(--card-bg);
    padding: 3rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 440px;
    animation: modalSlideIn 0.4s ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-header h2 {
    color: var(--text);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.auth-header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.auth-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    background: var(--bg);
    padding: 0.25rem;
    border-radius: var(--radius-sm);
}

.auth-tab {
    flex: 1;
    padding: 0.75rem;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.auth-tab.active {
    background: var(--card-bg);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.auth-form .form-group {
    margin-bottom: 1.5rem;
}

.auth-form label {
    display: block;
    color: var(--text);
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.auth-form input {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    background: var(--bg);
    color: var(--text);
    transition: var(--transition);
}

.auth-form input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.auth-btn {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 1rem;
}

.auth-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.auth-btn:active {
    transform: translateY(0);
}

.auth-error {
    color: var(--danger);
    font-size: 0.875rem;
    margin-top: 1rem;
    text-align: center;
    min-height: 1.25rem;
}

.user-email {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-right: 1rem;
    padding: 0.5rem 1rem;
    background: var(--bg);
    border-radius: var(--radius-sm);
}

.logout-btn {
    padding: 0.5rem 1rem;
    background: var(--danger);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logout-btn:hover {
    background: #dc2626;
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    .auth-modal-content {
        padding: 2rem;
        width: 95%;
    }
    
    .auth-header h2 {
        font-size: 1.5rem;
    }
    
    .header-actions {
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    
    .user-email {
        display: none; /* Hide email on mobile */
    }
    
    .logout-btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
    }
}

[data-theme="dark"] {
    --primary: #818cf8;
    --primary-hover: #6366f1;
    --secondary: #a78bfa;
    --accent: #22d3ee;
    --success: #34d399;
    --danger: #f87171;
    --warning: #fbbf24;
    
    --bg: #0f172a;
    --bg-secondary: #1e293b;
    --card-bg: #1e293b;
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --border: #334155;
    
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.6);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

/* ========================================
   HEADER
   ======================================== */

.main-header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

[data-theme="dark"] .main-header {
    background: rgba(30, 41, 59, 0.95);
}

.header-container {
    max-width: 100%;
    padding: 1.25rem 3rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    cursor: pointer;
    transition: var(--transition);
}

.logo:hover {
    transform: translateY(-2px);
}

.logo-icon {
    font-size: 2rem;
    filter: drop-shadow(0 2px 8px rgba(99, 102, 241, 0.3));
}

.logo-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-nav {
    display: flex;
    gap: 0.5rem;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    background: transparent;
    border: none;
    border-radius: var(--radius);
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.nav-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    transition: left 0.4s ease;
    z-index: -1;
    border-radius: var(--radius);
}

.nav-btn:hover::before {
    left: 0;
}

.nav-btn:hover {
    color: white;
    transform: translateY(-2px);
}

.nav-btn.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

.nav-btn.active::before {
    display: none;
}

.nav-btn .icon {
    font-size: 1.2rem;
}

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

.theme-toggle {
    padding: 0.75rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 1.3rem;
    cursor: pointer;
    transition: var(--transition);
}

.theme-toggle:hover {
    background: var(--primary);
    border-color: var(--primary);
    transform: rotate(20deg) scale(1.1);
}

.theme-toggle:hover .theme-icon {
    filter: brightness(0) invert(1);
}

/* ========================================
   CONTAINER & LAYOUT
   ======================================== */

.container {
    flex: 1;
    width: 100%;
    padding: 2.5rem 3rem;
    max-width: 1600px;
    margin: 0 auto;
}

/* ========================================
   SUMMARY CARDS
   ======================================== */

.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.summary-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.summary-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary) 0%, var(--secondary) 100%);
    opacity: 0;
    transition: var(--transition);
}

.summary-card:hover::before {
    opacity: 1;
}

.summary-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary);
}

.summary-card:nth-child(1) .summary-icon {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
}

.summary-card:nth-child(2) .summary-icon {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.summary-card:nth-child(3) .summary-icon {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

.summary-card:nth-child(4) .summary-icon {
    background: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
}

.summary-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.85rem;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.summary-card:hover .summary-icon {
    transform: scale(1.1) rotate(5deg);
}

.summary-details {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.summary-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.summary-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text);
}

/* ========================================
   CARDS
   ======================================== */

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2.25rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
    border-color: rgba(99, 102, 241, 0.2);
}

.card-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--bg);
}

.card-header h2 {
    font-size: 1.625rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.card-subtitle {
    font-size: 0.925rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ========================================
   FORMS
   ======================================== */

.form-group {
    margin-bottom: 1.5rem;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text);
    font-size: 0.9rem;
}

input, select {
    width: 100%;
    padding: 0.875rem 1.25rem;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    color: var(--text);
    font-size: 0.95rem;
    transition: var(--transition);
    font-family: inherit;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--card-bg);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
    transform: translateY(-1px);
}

input:hover, select:hover {
    border-color: var(--primary);
}

.error {
    color: var(--danger);
    font-size: 0.85rem;
    margin-top: 0.25rem;
    display: block;
}

/* ========================================
   BUTTONS
   ======================================== */

.btn {
    padding: 0.875rem 2rem;
    border: none;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-hover) 0%, var(--primary) 100%);
    opacity: 0;
    transition: var(--transition);
}

.btn-primary:hover::before {
    opacity: 1;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.btn-primary:active {
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
}

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

.btn-icon {
    background: transparent;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    transition: var(--transition);
}

.btn-icon:hover {
    background: var(--bg);
    transform: scale(1.1);
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

/* ========================================
   FILTERS
   ======================================== */

.filters {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.filter-select {
    padding: 0.625rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    color: var(--text);
    font-size: 0.9rem;
    cursor: pointer;
}

/* ========================================
   TABLES
   ======================================== */

.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

thead {
    background: var(--bg);
    border-bottom: 2px solid var(--border);
}

th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--text);
    font-size: 0.9rem;
}

td {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    color: var(--text);
}

tbody tr {
    transition: var(--transition);
    border-bottom: 1px solid var(--border);
}

tbody tr:hover {
    background: var(--bg);
    transform: scale(1.01);
    box-shadow: var(--shadow-sm);
}

.amount {
    font-weight: 600;
    color: var(--primary);
}

.text-center {
    text-align: center;
}

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

/* ========================================
   CATEGORY BADGES
   ======================================== */

.category-badge {
    display: inline-block;
    padding: 0.375rem 0.75rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 500;
}

.category-food { background: #fef3c7; color: #92400e; }
.category-transport { background: #dbeafe; color: #1e40af; }
.category-entertainment { background: #fce7f3; color: #9f1239; }
.category-utilities { background: #d1fae5; color: #065f46; }
.category-healthcare { background: #fee2e2; color: #991b1b; }
.category-shopping { background: #e0e7ff; color: #3730a3; }
.category-education { background: #e0f2fe; color: #075985; }
.category-other { background: #f3f4f6; color: #374151; }

[data-theme="dark"] .category-food { background: #451a03; color: #fcd34d; }
[data-theme="dark"] .category-transport { background: #1e3a8a; color: #93c5fd; }
[data-theme="dark"] .category-entertainment { background: #831843; color: #f9a8d4; }
[data-theme="dark"] .category-utilities { background: #064e3b; color: #6ee7b7; }
[data-theme="dark"] .category-healthcare { background: #7f1d1d; color: #fca5a5; }
[data-theme="dark"] .category-shopping { background: #312e81; color: #c7d2fe; }
[data-theme="dark"] .category-education { background: #164e63; color: #67e8f9; }
[data-theme="dark"] .category-other { background: #374151; color: #d1d5db; }

/* ========================================
   CHARTS
   ======================================== */

.charts-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.chart-wrapper {
    position: relative;
    height: 350px;
    padding: 1.5rem;
    background: var(--bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.chart-wrapper:hover {
    box-shadow: var(--shadow-sm);
    border-color: rgba(99, 102, 241, 0.2);
}

.chart-wrapper-full {
    position: relative;
    height: 400px;
    width: 100%;
    padding: 1.5rem;
    background: var(--bg);
    border-radius: var(--radius);
}

/* ========================================
   CATEGORY SUMMARY
   ======================================== */

.category-summary {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.category-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.category-bar {
    flex: 1;
    height: 8px;
    background: var(--bg);
    border-radius: 4px;
    overflow: hidden;
}

.category-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 4px;
    transition: width 0.6s ease;
}

.category-amount {
    font-weight: 600;
    color: var(--text);
    min-width: 140px;
    text-align: right;
}

/* ========================================
   FOOTER
   ======================================== */

.main-footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border);
    margin-top: auto;
}

.footer-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 3rem 3rem 1.5rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.footer-section h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text);
}

.footer-section h4 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
    color: var(--text);
}

.footer-section p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--primary);
}

.footer-version {
    font-size: 0.85rem;
    margin-top: 0.5rem;
    color: var(--text-secondary);
}

.footer-bottom {
    border-top: 1px solid var(--border);
    padding: 1.5rem 3rem;
    text-align: center;
}

.footer-bottom p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ========================================
   RESPONSIVE
   ======================================== */

@media (max-width: 1024px) {
    .header-container,
    .container,
    .footer-container,
    .footer-bottom {
        padding-left: 2rem;
        padding-right: 2rem;
    }
}

@media (max-width: 768px) {
    .header-container {
        flex-wrap: wrap;
        padding: 1rem 1.5rem;
        gap: 1rem;
    }
    
    .logo {
        font-size: 1.25rem;
    }
    
    .logo-icon {
        font-size: 1.75rem;
    }
    
    .header-nav {
        width: 100%;
        justify-content: space-between;
        gap: 0.5rem;
    }
    
    .nav-btn {
        flex: 1;
        justify-content: center;
        padding: 0.75rem 0.5rem;
        font-size: 0.85rem;
    }
    
    .nav-btn .icon {
        font-size: 1.1rem;
    }
    
    .header-actions {
        position: absolute;
        top: 1rem;
        right: 1.5rem;
    }
    
    .theme-toggle {
        padding: 0.625rem;
        font-size: 1.1rem;
    }
    
    .container {
        padding: 1.5rem;
    }
    
    .summary-cards {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .charts-container {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .footer-container {
        grid-template-columns: 1fr;
        padding: 2rem 1.5rem 1rem;
    }
    
    .footer-bottom {
        padding: 1rem 1.5rem;
    }
}

/* ========================================
   ANIMATIONS
   ======================================== */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.card {
    animation: fadeIn 0.5s ease forwards;
}

.summary-card {
    animation: scaleIn 0.4s ease forwards;
}

.summary-card:nth-child(1) { animation-delay: 0.1s; opacity: 0; }
.summary-card:nth-child(2) { animation-delay: 0.2s; opacity: 0; }
.summary-card:nth-child(3) { animation-delay: 0.3s; opacity: 0; }
.summary-card:nth-child(4) { animation-delay: 0.4s; opacity: 0; }

tbody tr {
    animation: slideIn 0.3s ease forwards;
}

tbody tr:nth-child(1) { animation-delay: 0.05s; }
tbody tr:nth-child(2) { animation-delay: 0.1s; }
tbody tr:nth-child(3) { animation-delay: 0.15s; }
tbody tr:nth-child(4) { animation-delay: 0.2s; }
tbody tr:nth-child(5) { animation-delay: 0.25s; }