/* Main Styles */
:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --primary-light: #5dade2;
    --secondary-color: #2ecc71;
    --secondary-dark: #27ae60;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --dark-bg: #1a1a2e;
    --dark-bg-2: #16213e;
    --dark-bg-3: #0f3460;
    --light-bg: #f8f9fa;
    --light-bg-2: #e9ecef;
    --text-dark: #212529;
    --text-light: #6c757d;
    --text-muted: #adb5bd;
    --border-color: #dee2e6;
    --border-light: #e9ecef;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s ease;
    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8ec 100%);
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Enhanced Navbar */
.navbar {
    background: linear-gradient(135deg, var(--dark-bg) 0%, var(--dark-bg-2) 100%);
    color: white;
    padding: 0;
    box-shadow: var(--shadow-lg);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-brand a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: white;
    text-decoration: none;
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    transition: var(--transition-fast);
}

.nav-brand a:hover {
    opacity: 0.9;
}

.nav-logo {
    width: 38px;
    height: 38px;
    padding: 6px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-sm);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    padding: 0.6rem 1.1rem;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
}

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

.nav-link.active {
    color: white;
    background-color: var(--dark-bg-3);
}

/* Install App Button in Nav */
.nav-link.install-link {
    background: linear-gradient(135deg, var(--secondary-color), var(--secondary-dark));
    color: white;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.nav-link.install-link:hover {
    background: linear-gradient(135deg, var(--secondary-dark), #1e8449);
    transform: translateY(-1px);
}

.nav-link.install-link svg {
    width: 16px;
    height: 16px;
}

.nav-user {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-left: 1rem;
    padding-left: 1rem;
    border-left: 1px solid rgba(255, 255, 255, 0.15);
}

.username {
    color: var(--secondary-color);
    font-weight: 600;
    font-size: 0.9rem;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

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

.nav-toggle span {
    width: 24px;
    height: 2px;
    background-color: white;
    border-radius: 2px;
    transition: var(--transition);
}

/* Desktop Enhancement - Larger screens */
@media (min-width: 1200px) {
    .container {
        max-width: 1320px;
    }
    
    .navbar .container {
        height: 76px;
    }
    
    .nav-brand a {
        font-size: 1.5rem;
    }
    
    .nav-logo {
        width: 42px;
        height: 42px;
    }
    
    .nav-link {
        padding: 0.7rem 1.25rem;
    }
}

/* Medium screens */
@media (min-width: 769px) and (max-width: 1199px) {
    .nav-link {
        padding: 0.5rem 0.9rem;
        font-size: 0.9rem;
    }
}

/* Mobile Menu */
@media (max-width: 768px) {
    .navbar .container {
        height: 60px;
    }
    
    .nav-menu {
        display: flex;
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        bottom: 0;
        height: calc(100vh - 60px);
        height: calc(100dvh - 60px);
        background: linear-gradient(180deg, var(--dark-bg) 0%, var(--dark-bg-2) 100%);
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-start;
        padding: 1.5rem;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        overflow-y: auto;
        z-index: 1000;
        gap: 0.5rem;
        pointer-events: none;
    }
    
    .nav-menu.active {
        transform: translateX(0);
        pointer-events: auto;
    }
    
    .nav-link {
        padding: 1rem;
        font-size: 1.1rem;
        border-radius: var(--radius);
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-user {
        flex-direction: column;
        align-items: stretch;
        width: 100%;
        margin: 1rem 0 0 0;
        padding: 1rem 0 0 0;
        border-left: none;
        border-top: 1px solid rgba(255, 255, 255, 0.15);
        gap: 0.75rem;
    }
    
    .username {
        font-size: 1rem;
        text-align: center;
    }
    
    .nav-user .btn {
        width: 100%;
        justify-content: center;
    }
}

/* Main Content */
.main-content {
    min-height: calc(100vh - 140px);
    padding: 2.5rem 0;
}

@media (min-width: 1200px) {
    .main-content {
        padding: 3rem 0;
    }
}

@media (max-width: 768px) {
    .main-content {
        padding: 1.5rem 0;
    }
}

/* Footer */
.footer {
    background: linear-gradient(135deg, var(--dark-bg) 0%, var(--dark-bg-2) 100%);
    color: white;
    text-align: center;
    padding: 2.5rem 0;
    margin-top: auto;
}

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

/* Enhanced Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.btn svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 14px rgba(52, 152, 219, 0.35);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.45);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary-color), var(--secondary-dark));
    color: white;
    box-shadow: 0 4px 14px rgba(46, 204, 113, 0.35);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(46, 204, 113, 0.45);
}

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

.btn-outline:hover {
    background-color: var(--light-bg);
    border-color: var(--text-light);
}

.navbar .btn-outline {
    color: white;
    border-color: rgba(255, 255, 255, 0.4);
}

.navbar .btn-outline:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: white;
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger-color), #c0392b);
    color: white;
    box-shadow: 0 4px 14px rgba(231, 76, 60, 0.35);
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(231, 76, 60, 0.45);
}

.btn-block {
    display: flex;
    width: 100%;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

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

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* Messages */
.message {
    padding: 1rem 1.25rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.message.success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.message.error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.message.info {
    background-color: #dbeafe;
    color: #1e40af;
    border: 1px solid #bfdbfe;
}

.message.warning {
    background-color: #fef3c7;
    color: #92400e;
    border: 1px solid #fde68a;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    z-index: 9999;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* PWA Install Prompt */
.install-prompt {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: 1.5rem;
    max-width: 360px;
    z-index: 1000;
    animation: slideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    border: 1px solid var(--border-light);
}

.install-prompt::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

@keyframes slideUp {
    from {
        transform: translateY(100px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.install-prompt-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.install-prompt-icon svg {
    width: 24px;
    height: 24px;
    stroke: white;
}

.install-prompt h3 {
    margin-bottom: 0.5rem;
    color: var(--text-dark);
    font-size: 1.1rem;
    font-weight: 700;
}

.install-prompt p {
    color: var(--text-light);
    margin-bottom: 1.25rem;
    font-size: 0.9rem;
    line-height: 1.5;
}

.install-prompt-actions {
    display: flex;
    gap: 0.75rem;
}

.install-prompt-actions .btn {
    flex: 1;
    padding: 0.7rem 1rem;
}

.install-prompt-close {
    position: absolute;
    top: 12px;
    right: 12px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    color: var(--text-muted);
    transition: var(--transition-fast);
}

.install-prompt-close:hover {
    color: var(--text-dark);
}

/* Responsive Install Prompt */
@media (max-width: 768px) {
    .install-prompt {
        bottom: 16px;
        right: 16px;
        left: 16px;
        max-width: none;
    }
}

/* Cards for Desktop */
.card {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
}

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

.card-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-light);
    background: var(--light-bg);
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-light);
    background: var(--light-bg);
}

/* Page Headers */
.page-header {
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--text-light);
    font-size: 1.05rem;
}

@media (min-width: 1200px) {
    .page-header h1 {
        font-size: 2.5rem;
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.hidden { display: none !important; }