/* =============================================================================
   Volleyball Club S&C Application - CSS Styles
   File: assets/css/style.css
   ============================================================================= */

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f7fa;
}

/* Color Variables */
:root {
    --primary-color: #c41e3a;      /* Crvena Zvezda Red */
    --primary-dark: #a01729;
    --primary-light: #e85577;
    --secondary-color: #2c3e50;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --info-color: #3498db;
    --light-gray: #ecf0f1;
    --medium-gray: #95a5a6;
    --dark-gray: #34495e;
    --white: #ffffff;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

/* Layout Components */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar Navigation */
.sidebar {
    width: 280px;
    background: linear-gradient(180deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: 0;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    z-index: 1000;
}

.sidebar-header {
    padding: 2rem 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.sidebar-header h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.nav-menu {
    list-style: none;
    padding: 1rem 0;
}

.nav-menu li {
    margin: 0;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 1rem 1.5rem;
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.nav-link:hover,
.nav-link.active {
    background-color: rgba(255, 255, 255, 0.1);
    border-left-color: var(--white);
    color: var(--white);
}

/* Main Content Area */
.main-content {
    flex: 1;
    margin-left: 280px;
    display: flex;
    flex-direction: column;
}

.top-bar {
    background: var(--white);
    padding: 1rem 2rem;
    box-shadow: var(--shadow);
    border-bottom: 1px solid var(--light-gray);
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

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

.content {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    margin-bottom: 1rem;
    font-weight: 600;
    color: var(--dark-gray);
}

h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

/* Page Headers */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--light-gray);
}

.page-header p {
    color: var(--medium-gray);
    margin: 0;
}

/* Dashboard Components */
.dashboard-header {
    margin-bottom: 2rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.stat-icon {
    font-size: 2.5rem;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(45deg, var(--primary-color), var(--primary-light));
    border-radius: 50%;
}

.stat-content h3 {
    font-size: 2rem;
    margin: 0;
    color: var(--primary-color);
}

.stat-content p {
    margin: 0;
    color: var(--medium-gray);
    font-weight: 500;
}

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

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

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--dark-gray);
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="number"],
input[type="date"],
input[type="password"],
select,
textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--light-gray);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--white);
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(196, 30, 58, 0.1);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    line-height: 1;
}

.btn-primary {
    background: linear-gradient(45deg, var(--primary-color), var(--primary-light));
    color: var(--white);
}

.btn-primary:hover {
    background: linear-gradient(45deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-1px);
}

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

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

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

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

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

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-full {
    width: 100%;
}

/* Tables */
.table-container {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    margin-bottom: 2rem;
}

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

.data-table th,
.data-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--light-gray);
}

.data-table th {
    background: linear-gradient(45deg, var(--secondary-color), var(--dark-gray));
    color: var(--white);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 0.5px;
}

.data-table tbody tr:hover {
    background: rgba(196, 30, 58, 0.05);
}

/* Status Badges */
.status-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-scheduled {
    background: rgba(52, 152, 219, 0.1);
    color: var(--info-color);
}

.status-completed {
    background: rgba(39, 174, 96, 0.1);
    color: var(--success-color);
}

.status-missed {
    background: rgba(231, 76, 60, 0.1);
    color: var(--danger-color);
}

.status-cancelled {
    background: rgba(149, 165, 166, 0.1);
    color: var(--medium-gray);
}

/* Difficulty Badges */
.difficulty-badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.difficulty-beginner {
    background: rgba(39, 174, 96, 0.1);
    color: var(--success-color);
}

.difficulty-intermediate {
    background: rgba(243, 156, 18, 0.1);
    color: var(--warning-color);
}

.difficulty-advanced {
    background: rgba(231, 76, 60, 0.1);
    color: var(--danger-color);
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    border-left: 4px solid;
}

.alert-success {
    background: rgba(39, 174, 96, 0.1);
    border-color: var(--success-color);
    color: #1e6b3a;
}

.alert-error {
    background: rgba(231, 76, 60, 0.1);
    border-color: var(--danger-color);
    color: #a93226;
}

.alert-warning {
    background: rgba(243, 156, 18, 0.1);
    border-color: var(--warning-color);
    color: #b7950b;
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
}

.modal-content {
    background: var(--white);
    margin: 5% auto;
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.modal-header h2 {
    margin: 0;
    color: var(--primary-color);
}

.close {
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    color: var(--medium-gray);
    transition: var(--transition);
}

.close:hover {
    color: var(--danger-color);
}

.modal-content form {
    padding: 1.5rem;
}

.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--light-gray);
}

/* Login Page */
.login-page {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 2rem;
}

.login-form {
    background: var(--white);
    padding: 3rem;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

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

.logo h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.logo p {
    color: var(--medium-gray);
    margin: 0;
}

.demo-credentials {
    text-align: center;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--light-gray);
}

/* Workout Builder */
.workout-builder {
    display: grid;
    gap: 2rem;
}

.builder-controls {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.exercise-selector {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.exercise-filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.exercise-filters select {
    flex: 1;
    max-width: 200px;
}

.exercise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.exercise-card {
    border: 2px solid var(--light-gray);
    border-radius: var(--border-radius);
    padding: 1rem;
    cursor: pointer;
    transition: var(--transition);
    background: var(--white);
}

.exercise-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.exercise-image {
    width: 100%;
    height: 120px;
    overflow: hidden;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
}

.exercise-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.exercise-info h4 {
    margin-bottom: 0.5rem;
    color: var(--dark-gray);
}

.exercise-info p {
    color: var(--medium-gray);
    margin-bottom: 0.5rem;
}

.workout-plan {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.exercise-list {
    margin-bottom: 2rem;
}

.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--medium-gray);
}

.workout-exercise-item {
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
    background: #f9f9f9;
}

.exercise-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.exercise-header h4 {
    margin: 0;
    color: var(--primary-color);
}

.btn-remove {
    background: var(--danger-color);
    color: var(--white);
    border: none;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.exercise-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.detail-group {
    display: flex;
    flex-direction: column;
}

.detail-group label {
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
    color: var(--dark-gray);
}

.detail-group input {
    padding: 0.5rem;
    border: 1px solid var(--light-gray);
    border-radius: 4px;
}

.exercise-notes {
    margin-top: 1rem;
}

.exercise-notes label {
    display: block;
    margin-bottom: 0.5rem;
}

.exercise-notes input {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--light-gray);
    border-radius: 4px;
}

.restrictions {
    margin-top: 1rem;
}

.restriction-alert {
    background: rgba(243, 156, 18, 0.1);
    border: 1px solid var(--warning-color);
    border-radius: 4px;
    padding: 0.5rem;
    margin-bottom: 0.5rem;
    color: #b7950b;
    font-size: 0.875rem;
}

.plan-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    padding-top: 1rem;
    border-top: 1px solid var(--light-gray);
}

/* Recent Activity */
.recent-activity {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .exercise-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .modal-content {
        width: 95%;
        margin: 2% auto;
    }
    
    .content {
        padding: 1rem;
    }
    
    .top-bar {
        padding: 1rem;
    }
    
    .exercise-details {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .exercise-details {
        grid-template-columns: 1fr;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .stat-card {
        flex-direction: column;
        text-align: center;
    }
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.spinner {
    border: 2px solid var(--light-gray);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
    display: inline-block;
    margin-right: 0.5rem;
}

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

/* Utility Classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }

/* Dark mode support (optional) */
@media (prefers-color-scheme: dark) {
    :root {
        --background: #1a1a1a;
        --surface: #2d2d2d;
        --text: #ffffff;
        --text-secondary: #b0b0b0;
    }
    
    /* Apply dark mode styles if needed */
}