/* ========================================
   🎨 SHEET TRACKING SYSTEM - ENHANCED STYLES
   ======================================== */

/* ========================================
   📱 RESET & BASE STYLES
   ======================================== */

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

:root {
    /* Light Theme Colors */
    --bg-primary: #f5f7fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e4e7eb;
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    --border-color: #e2e8f0;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Accent Colors */
    --color-primary: #4299e1;
    --color-primary-hover: #3182ce;
    --color-success: #48bb78;
    --color-success-hover: #38a169;
    --color-danger: #f56565;
    --color-danger-hover: #e53e3e;
    --color-warning: #ed8936;
    --color-warning-hover: #dd6b20;
    --color-info: #4299e1;
    --color-secondary: #718096;
    --color-secondary-hover: #4a5568;

    /* Animation */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

.dark-theme {
    /* Dark Theme Colors */
    --bg-primary: #1a202c;
    --bg-secondary: #2d3748;
    --bg-tertiary: #4a5568;
    --text-primary: #f7fafc;
    --text-secondary: #e2e8f0;
    --text-muted: #a0aec0;
    --border-color: #4a5568;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}

html {
    scroll-behavior: smooth;
}

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: 1.6;
    font-size: 14px;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ========================================
   🎭 SMOOTH ANIMATIONS
   ======================================== */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    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);
    }
}

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

.fade-in {
    animation: fadeIn var(--transition-normal) ease-out;
}

.slide-in {
    animation: slideIn var(--transition-normal) ease-out;
}

.scale-in {
    animation: scaleIn var(--transition-normal) ease-out;
}

/* ========================================
   🔐 LOGIN PAGE
   ======================================== */

.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 400px;
    animation: scaleIn var(--transition-slow) ease-out;
}

.login-box {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 32px;
    box-shadow: var(--shadow-xl);
    transition: box-shadow var(--transition-normal);
}

.login-box:hover {
    box-shadow: var(--shadow-xl), 0 0 0 1px var(--border-color);
}

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.login-header h1 {
    font-size: 24px;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.login-header p {
    color: var(--text-muted);
    font-size: 14px;
}

.login-footer {
    margin-top: 24px;
    text-align: center;
}

.login-footer code {
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 12px;
}

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

.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.header-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-info {
    color: var(--text-secondary);
    font-size: 14px;
    transition: color var(--transition-fast);
}

/* ========================================
   📄 MAIN CONTENT
   ======================================== */

.main-content {
    padding: 24px 0;
    min-height: calc(100vh - 200px);
}

.container-fluid {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========================================
   📊 STATISTICS CARDS
   ======================================== */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 16px;
    transition: all var(--transition-normal);
    cursor: pointer;
    animation: fadeIn var(--transition-slow) ease-out;
}

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

.stat-icon {
    font-size: 36px;
    line-height: 1;
    transition: transform var(--transition-fast);
}

.stat-card:hover .stat-icon {
    transform: scale(1.1);
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
}

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

.card {
    background: var(--bg-secondary);
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
    overflow: hidden;
    transition: all var(--transition-normal);
    animation: fadeIn var(--transition-slow) ease-out;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-body {
    padding: 24px;
}

/* ========================================
   📝 FORMS & INPUTS - ENHANCED
   ======================================== */

.filter-form {
    animation: fadeIn var(--transition-slow) ease-out 0.1s;
}

.filter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.form-control,
.form-control select,
.form-control input {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    transition: all var(--transition-fast);
    outline: none;
}

.form-control:hover {
    border-color: var(--color-primary);
}

.form-control:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.1);
    background: var(--bg-secondary);
}

.form-control::placeholder {
    color: var(--text-muted);
}

/* Enhanced Select Dropdown */
select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23718096' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
    cursor: pointer;
}

select.form-control:hover {
    background-color: var(--bg-secondary);
}

select.form-control option {
    padding: 10px;
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* Input with icon */
.input-icon-wrapper {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

.input-icon-wrapper .form-control {
    padding-left: 40px;
}

/* ========================================
   🔘 BUTTONS - ENHANCED
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    font-family: inherit;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:active {
    transform: scale(0.97);
}

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

.btn-primary:hover {
    background: var(--color-primary-hover);
    box-shadow: 0 4px 12px rgba(66, 153, 225, 0.3);
}

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

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

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

.btn-success:hover {
    background: var(--color-success-hover);
    box-shadow: 0 4px 12px rgba(72, 187, 120, 0.3);
}

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

.btn-danger:hover {
    background: var(--color-danger-hover);
    box-shadow: 0 4px 12px rgba(245, 101, 101, 0.3);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ========================================
   🎯 FILTER ACTIONS
   ======================================== */

.filter-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    animation: slideIn var(--transition-slow) ease-out 0.2s;
}

/* ========================================
   📋 TABLES - ENHANCED
   ======================================== */

.table-responsive {
    overflow-x: auto;
    border-radius: 8px;
    margin: -24px;
    padding: 24px;
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.table thead {
    background: var(--bg-tertiary);
    position: sticky;
    top: 0;
    z-index: 10;
}

.table th {
    padding: 14px 16px;
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    border-bottom: 2px solid var(--border-color);
    transition: background var(--transition-fast);
}

.table td {
    padding: 14px 16px;
    border-top: 1px solid var(--border-color);
    max-width: 250px;
    transition: background var(--transition-fast);
}

.table tbody tr {
    transition: all var(--transition-fast);
    animation: fadeIn var(--transition-normal) ease-out;
}

.table tbody tr:hover {
    background: var(--bg-tertiary);
    transform: scale(1.005);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.text-truncate {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.text-nowrap {
    white-space: nowrap;
}

.text-muted {
    color: var(--text-muted);
    font-size: 12px;
}

code {
    background: var(--bg-tertiary);
    padding: 4px 8px;
    border-radius: 6px;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 12px;
    font-weight: 500;
    transition: all var(--transition-fast);
}

code:hover {
    background: var(--color-primary);
    color: white;
}

/* ========================================
   🏷️ BADGES - ENHANCED
   ======================================== */

.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
    line-height: 1.4;
    transition: all var(--transition-fast);
}

.badge:hover {
    transform: scale(1.05);
}

.badge-primary {
    background: rgba(66, 153, 225, 0.15);
    color: var(--color-primary);
}

.badge-success {
    background: rgba(72, 187, 120, 0.15);
    color: var(--color-success);
}

.badge-danger {
    background: rgba(245, 101, 101, 0.15);
    color: var(--color-danger);
}

.badge-warning {
    background: rgba(237, 137, 54, 0.15);
    color: var(--color-warning);
}

.badge-info {
    background: rgba(66, 153, 225, 0.15);
    color: var(--color-info);
}

.badge-secondary {
    background: rgba(113, 128, 150, 0.15);
    color: var(--color-secondary);
}

/* ========================================
   📄 PAGINATION - ENHANCED
   ======================================== */

.pagination {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

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

.pagination-links {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.current-page {
    padding: 6px 12px;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 13px;
}

/* ========================================
   🔄 LOADING STATES
   ======================================== */

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(66, 153, 225, 0.2);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ========================================
   📱 EMPTY STATE
   ======================================== */

.empty-state {
    text-align: center;
    padding: 60px 20px;
    animation: fadeIn var(--transition-slow) ease-out;
}

.empty-icon {
    font-size: 64px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 20px;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.empty-state p {
    color: var(--text-muted);
    font-size: 14px;
}

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

.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 20px 0;
    margin-top: 40px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 13px;
    color: var(--text-muted);
}

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

@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }

    .filter-grid {
        grid-template-columns: 1fr;
    }

    .filter-actions {
        flex-direction: column;
    }

    .filter-actions .btn {
        width: 100%;
    }

    .table {
        font-size: 12px;
    }

    .table th,
    .table td {
        padding: 10px 12px;
    }

    .pagination {
        flex-direction: column;
        text-align: center;
    }

    .card-body {
        padding: 16px;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .header-title {
        font-size: 16px;
    }

    .stat-value {
        font-size: 24px;
    }
}

/* ========================================
   🎨 UTILITY CLASSES
   ======================================== */

.d-block {
    display: block;
}

.d-none {
    display: none;
}

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }

/* ========================================
   🌈 CUSTOM SCROLLBAR
   ======================================== */

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 5px;
    transition: background var(--transition-fast);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}