/* ===================================
   MODERN DASHBOARD - FULLY RESPONSIVE
   =================================== */

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

:root {
    /* Modern Color Palette */
    --primary: #6366F1;
    --primary-dark: #4F46E5;
    --primary-light: #818CF8;
    --secondary: #10B981;
    --secondary-dark: #059669;
    --accent: #F59E0B;
    --danger: #EF4444;
    --warning: #F59E0B;
    --info: #3B82F6;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667EEA 0%, #764BA2 100%);
    --gradient-secondary: linear-gradient(135deg, #F093FB 0%, #F5576C 100%);
    --gradient-success: linear-gradient(135deg, #4FACFE 0%, #00F2FE 100%);
    --gradient-warning: linear-gradient(135deg, #FA709A 0%, #FEE140 100%);
    --gradient-purple: linear-gradient(135deg, #A8EDEA 0%, #FED6E3 100%);
    --gradient-blue: linear-gradient(135deg, #667EEA 0%, #764BA2 100%);
    
    /* Background Colors */
    --bg-primary: #F8FAFC;
    --bg-secondary: #FFFFFF;
    --bg-dark: #1E293B;
    --bg-card: #FFFFFF;
    
    /* Text Colors */
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-light: #94A3B8;
    --text-white: #FFFFFF;
    
    /* Borders */
    --border-color: #E2E8F0;
    --border-radius: 16px;
    --border-radius-sm: 12px;
    --border-radius-lg: 24px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   LOGIN PAGE
   =================================== */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--gradient-primary);
    padding: 20px;
    position: relative;
    overflow: hidden;
}

.login-page::before {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    top: -250px;
    right: -250px;
    animation: float 20s ease-in-out infinite;
}

.login-page::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 50%;
    bottom: -200px;
    left: -200px;
    animation: float 15s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    50% { transform: translate(30px, -30px) rotate(180deg); }
}

.login-container {
    width: 100%;
    max-width: 440px;
    position: relative;
    z-index: 1;
}

.login-box {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    padding: 48px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    animation: slideUp 0.5s ease-out;
}

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

.login-box h1 {
    text-align: center;
    margin-bottom: 32px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.login-info {
    margin-top: 24px;
    text-align: center;
    font-size: 14px;
    color: var(--text-secondary);
    padding: 12px 16px;
    background: linear-gradient(135deg, #F0F9FF 0%, #E0F2FE 100%);
    border-radius: var(--border-radius-sm);
    border: 1px solid rgba(59, 130, 246, 0.2);
}

/* ===================================
   NAVBAR
   =================================== */
.navbar {
    background: var(--bg-secondary);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

.navbar-brand {
    font-size: 24px;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.navbar-user {
    display: flex;
    align-items: center;
    gap: 16px;
}

.navbar-user span {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 15px;
}

/* ===================================
   DASHBOARD LAYOUT
   =================================== */
.dashboard-container {
    display: flex;
    min-height: calc(100vh - 70px);
}

.sidebar {
    width: 280px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    padding: 24px 0;
    position: sticky;
    top: 70px;
    height: calc(100vh - 70px);
    overflow-y: auto;
}

.nav-tabs {
    list-style: none;
    padding: 0 16px;
}

.nav-tabs li {
    margin-bottom: 8px;
}

.nav-tabs a {
    display: flex;
    align-items: center;
    padding: 14px 20px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    font-size: 15px;
    position: relative;
    overflow: hidden;
}

.nav-tabs a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 4px;
    background: var(--primary);
    transform: scaleY(0);
    transition: var(--transition);
}

.nav-tabs a:hover {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(99, 102, 241, 0.04) 100%);
    color: var(--primary);
    transform: translateX(4px);
}

.nav-tabs a.active {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.12) 0%, rgba(99, 102, 241, 0.06) 100%);
    color: var(--primary);
    font-weight: 600;
}

.nav-tabs a.active::before {
    transform: scaleY(1);
}

.main-content {
    flex: 1;
    padding: 32px;
    overflow-y: auto;
    background: var(--bg-primary);
}

.main-content h2 {
    margin-bottom: 32px;
    color: var(--text-primary);
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===================================
   STATS CARDS
   =================================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--bg-card);
    padding: 28px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: var(--transition);
}

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

.stat-card:hover::before {
    transform: scaleX(1);
}

.stat-card:nth-child(1)::before { background: var(--gradient-primary); }
.stat-card:nth-child(2)::before { background: var(--gradient-success); }
.stat-card:nth-child(3)::before { background: var(--gradient-warning); }
.stat-card:nth-child(4)::before { background: var(--gradient-secondary); }

.stat-card h3 {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stat-number {
    font-size: 40px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

/* ===================================
   FORMS
   =================================== */
.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 14px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 16px;
    font-family: inherit;
    transition: var(--transition);
    background: var(--bg-card);
    color: var(--text-primary);
}

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

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* ===================================
   BUTTONS
   =================================== */
.btn {
    padding: 14px 28px;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: inherit;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-white);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

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

.btn-sm {
    padding: 10px 20px;
    font-size: 14px;
}

/* ===================================
   ALERTS & MESSAGES
   =================================== */
.alert {
    padding: 16px 20px;
    border-radius: var(--border-radius-sm);
    margin-bottom: 24px;
    border: 1px solid;
}

.alert-error {
    background: linear-gradient(135deg, #FEE2E2 0%, #FECACA 100%);
    color: #991B1B;
    border-color: #FCA5A5;
}

.message {
    padding: 16px 20px;
    border-radius: var(--border-radius-sm);
    margin-top: 24px;
    border: 1px solid;
    font-weight: 500;
}

.message.success {
    background: linear-gradient(135deg, #D1FAE5 0%, #A7F3D0 100%);
    color: #065F46;
    border-color: #6EE7B7;
}

.message.error {
    background: linear-gradient(135deg, #FEE2E2 0%, #FECACA 100%);
    color: #991B1B;
    border-color: #FCA5A5;
}

/* ===================================
   FORMS (CARDS)
   =================================== */
.task-form,
.account-form,
.payment-form {
    background: var(--bg-card);
    padding: 32px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    max-width: 600px;
}

/* ===================================
   DATE FILTER
   =================================== */
.date-filter {
    background: var(--bg-card);
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.filter-form {
    display: flex;
    gap: 20px;
    align-items: end;
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.filter-group label {
    font-weight: 500;
    color: var(--text-primary);
}

.filter-group select {
    padding: 10px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 16px;
    min-width: 150px;
    background: var(--bg-card);
    color: var(--text-primary);
}

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

/* ===================================
   TASKS GRID
   =================================== */
.tasks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 20px;
}

.task-card {
    background: var(--bg-card);
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.task-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.task-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
}

.task-header h3 {
    color: var(--primary);
    font-size: 20px;
    font-weight: 600;
}

.task-date {
    color: var(--text-secondary);
    font-size: 14px;
    background: var(--bg-primary);
    padding: 5px 12px;
    border-radius: 6px;
}

.task-section {
    margin-bottom: 20px;
}

.task-section h4 {
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 10px;
}

.task-section p {
    color: var(--text-secondary);
    line-height: 1.8;
}

.task-footer {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
    color: var(--text-light);
    font-size: 14px;
}

/* ===================================
   PAYMENTS
   =================================== */
.payments-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.payment-card {
    background: var(--bg-card);
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.payment-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.payment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.payment-header h3 {
    color: var(--secondary);
    font-size: 28px;
    font-weight: 700;
}

.payment-date {
    color: var(--text-secondary);
    font-size: 14px;
}

.payment-card p {
    color: var(--text-secondary);
    margin-top: 10px;
}

.payment-total {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--text-white);
    padding: 25px;
    border-radius: var(--border-radius);
    margin-top: 20px;
    text-align: center;
}

.payment-total h3 {
    font-size: 32px;
    font-weight: 700;
}

/* ===================================
   CLIENTS LIST
   =================================== */
.clients-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.client-card {
    background: var(--bg-card);
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.client-card h4 {
    color: var(--primary);
    font-size: 20px;
    margin-bottom: 10px;
}

.client-card p {
    color: var(--text-secondary);
    font-size: 14px;
    margin: 5px 0;
}

/* ===================================
   EMPTY STATE
   =================================== */
.empty-state {
    background: var(--bg-card);
    padding: 60px 20px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow);
}

.empty-state p {
    color: var(--text-secondary);
    font-size: 18px;
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */
@media (max-width: 768px) {
    .dashboard-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-tabs {
        display: flex;
        overflow-x: auto;
    }
    
    .nav-tabs li {
        flex-shrink: 0;
    }
    
    .nav-tabs a {
        border-left: none;
        border-bottom: 3px solid transparent;
        padding: 15px 20px;
    }
    
    .nav-tabs a.active {
        border-left: none;
        border-bottom-color: var(--primary);
    }
    
    .main-content {
        padding: 20px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .tasks-grid {
        grid-template-columns: 1fr;
    }
    
    .filter-form {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-group select {
        width: 100%;
    }
}

/* ===================================
   SCROLLBAR STYLING
   =================================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-light);
}

/* ===================================
   ANIMATIONS
   =================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.task-card,
.payment-card,
.client-card,
.stat-card {
    animation: fadeIn 0.4s ease-out;
}