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

:root {
    --primary-color: #FF6B35;
    --primary-dark: #E85A2B;
    --secondary-color: #1A535C;
    --accent-color: #4ECDC4;
    --background-color: #F7FFF7;
    --text-color: #292F36;
    --text-light: #6C757D;
    --card-bg: #FFFFFF;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header Styles */
.app-header {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    color: white;
    padding: 1rem 0;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo i {
    font-size: 1.75rem;
}

.logo h1 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 800;
    font-size: 1.5rem;
}

.logo-pro {
    color: var(--accent-color);
    font-weight: 700;
}

/* Main Navigation */
.main-nav {
    position: relative;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 1.5rem;
    align-items: center;
}

.nav-link {
    color: white;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    background: rgba(255, 255, 255, 0.1);
}

/* Main Content */
.app-main {
    flex: 1;
    padding: 2rem 0;
}

/* View System */
.view {
    display: none;
}

.view.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.view-header {
    margin-bottom: 2rem;
}

.view-header h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--secondary-color);
}

.greeting {
    color: var(--text-light);
    font-size: 1.1rem;
}

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

.stat-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-card.stat-streak {
    border-left: 4px solid #FF6B35;
}

.stat-card.stat-workouts {
    border-left: 4px solid #4ECDC4;
}

.stat-card.stat-volume {
    border-left: 4px solid #1A535C;
}

.stat-card.stat-rank {
    border-left: 4px solid #FFD166;
}

.stat-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
}

.stat-card.stat-workouts .stat-icon {
    background: linear-gradient(135deg, #4ECDC4, #2BA9A0);
}

.stat-card.stat-volume .stat-icon {
    background: linear-gradient(135deg, #1A535C, #0F3A41);
}

.stat-card.stat-rank .stat-icon {
    background: linear-gradient(135deg, #FFD166, #FFC043);
}

.stat-content {
    flex: 1;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.stat-label {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Section Cards */
.section-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.section-header h3 {
    font-size: 1.25rem;
    color: var(--secondary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-content {
    /* Content styles */
}

.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-light);
    font-style: italic;
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius-sm);
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.3);
}

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

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-block {
    width: 100%;
}

.btn-logout {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-logout:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Form Styles */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 70vh;
}

.auth-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    width: 100%;
    max-width: 400px;
    box-shadow: var(--shadow-lg);
}

.auth-title {
    font-size: 1.75rem;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
    text-align: center;
}

.auth-subtitle {
    color: var(--text-light);
    text-align: center;
    margin-bottom: 2rem;
}

.auth-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.tab-btn {
    flex: 1;
    padding: 0.75rem;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    color: var(--text-light);
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #E0E0E0;
    border-radius: var(--border-radius-sm);
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Bottom Navigation (Mobile) */
.bottom-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--card-bg);
    border-top: 1px solid #E0E0E0;
    z-index: 1000;
    padding: 0.75rem 0;
}

.bottom-nav-link {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--text-light);
    font-size: 0.8rem;
    transition: var(--transition);
}

.bottom-nav-link i {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
}

.bottom-nav-link.active {
    color: var(--primary-color);
}

/* Toast Notifications */
#toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 2000;
}

.toast {
    background: var(--card-bg);
    border-radius: var(--border-radius-sm);
    padding: 1rem 1.5rem;
    margin-bottom: 0.5rem;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 1rem;
    min-width: 300px;
    transform: translateX(100%);
    animation: slideIn 0.3s ease forwards;
}

@keyframes slideIn {
    to { transform: translateX(0); }
}

.toast.success {
    border-left: 4px solid #4CAF50;
}

.toast.error {
    border-left: 4px solid #F44336;
}

.toast.warning {
    border-left: 4px solid #FF9800;
}

.toast.info {
    border-left: 4px solid #2196F3;
}

.toast-icon {
    font-size: 1.25rem;
}

.toast.success .toast-icon {
    color: #4CAF50;
}

.toast.error .toast-icon {
    color: #F44336;
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.toast-message {
    color: var(--text-light);
    font-size: 0.9rem;
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    font-size: 1rem;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 3000;
    display: none;
}

.loading-spinner {
    font-size: 3rem;
    color: var(--primary-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        right: 0;
        background: var(--card-bg);
        border-radius: var(--border-radius);
        box-shadow: var(--shadow-lg);
        padding: 1rem;
        flex-direction: column;
        align-items: stretch;
        min-width: 200px;
    }
    
    .nav-menu.show {
        display: flex;
    }
    
    .nav-link {
        color: var(--text-color);
        padding: 0.75rem 1rem;
    }
    
    .nav-link:hover,
    .nav-link.active {
        background: rgba(255, 107, 53, 0.1);
        color: var(--primary-color);
    }
    
    .btn-logout {
        background: var(--primary-color);
        color: white;
        justify-content: center;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .section-header {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
    
    .bottom-nav {
        display: flex;
        justify-content: space-around;
    }
    
    .auth-card {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 0.75rem;
    }
    
    .app-main {
        padding: 1rem 0;
    }
    
    .stat-card {
        padding: 1rem;
    }
    
    .stat-value {
        font-size: 1.5rem;
    }
}