/* QR-Gastro Main Styles */
:root {
    /* Color Palette - Warm & Professional */
    --primary: #D4A574;
    --primary-dark: #8B6F47;
    --primary-light: #F5E6D3;
    
    --secondary: #2C5F2D;
    --secondary-dark: #1B3A1C;
    --secondary-light: #97BC62;
    
    --accent: #E07A5F;
    --accent-dark: #C25940;
    
    --background: #FFFEF9;
    --surface: #FFFFFF;
    --surface-hover: #F8F7F2;
    
    --text-primary: #2D2D2D;
    --text-secondary: #6B6B6B;
    --text-light: #999999;
    
    --border: #E5E5E0;
    --shadow: rgba(139, 111, 71, 0.1);
    --shadow-heavy: rgba(139, 111, 71, 0.2);
    
    --success: #2C5F2D;
    --warning: #F4A261;
    --error: #E76F51;
    
    /* Typography */
    --font-display: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--spacing-md);
}

/* Screen Management */
.screen {
    display: none;
    min-height: 100vh;
}

.screen.active {
    display: flex;
    flex-direction: column;
}

/* App Header */
.app-header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 8px var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-small svg {
    display: block;
    filter: drop-shadow(0 2px 4px var(--shadow));
}

.header-info h2 {
    font-size: 1.25rem;
    margin: 0;
    color: var(--primary-dark);
}

.header-info p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-info {
    text-align: right;
}

.user-name {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.user-role {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Navigation Tabs */
.nav-tabs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    background: var(--surface);
    border-bottom: 2px solid var(--border);
    position: sticky;
    top: 72px;
    z-index: 99;
}

.nav-tab {
    background: transparent;
    border: none;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    transition: all var(--transition-base);
    border-bottom: 3px solid transparent;
    position: relative;
}

.nav-tab:hover {
    background: var(--surface-hover);
}

.nav-tab.active {
    border-bottom-color: var(--primary);
    background: var(--primary-light);
}

.tab-icon {
    font-size: 1.5rem;
}

.tab-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.nav-tab.active .tab-label {
    color: var(--primary-dark);
    font-weight: 600;
}

/* Main Content */
.app-content {
    flex: 1;
    padding: var(--spacing-lg);
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
}

.tab-content {
    display: none;
    animation: fadeIn var(--transition-base);
}

.tab-content.active {
    display: block;
}

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

/* Content Cards */
.content-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    box-shadow: 0 4px 12px var(--shadow);
    border: 1px solid var(--border);
}

.card-title {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.card-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* Buttons */
.btn {
    border: none;
    border-radius: var(--radius-md);
    padding: 12px 24px;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    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 var(--transition-slow), height var(--transition-slow);
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: 0 4px 12px var(--shadow-heavy);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--shadow-heavy);
}

.btn-primary:active {
    transform: translateY(0);
}

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

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

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

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

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

.btn-large {
    padding: 18px 32px;
    font-size: 1.125rem;
    width: 100%;
}

.btn-icon-only {
    padding: 12px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    font-size: 1.25rem;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* Forms */
.input-field {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: all var(--transition-base);
    background: var(--surface);
    color: var(--text-primary);
}

.input-field:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(212, 165, 116, 0.1);
}

.input-field::placeholder {
    color: var(--text-light);
}

select.input-field {
    cursor: pointer;
}

/* Toast Notifications */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--text-primary);
    color: white;
    padding: 16px 24px;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    z-index: 10000;
    opacity: 0;
    transition: all var(--transition-base);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    max-width: 90%;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.success {
    background: var(--success);
}

.toast.error {
    background: var(--error);
}

.toast.warning {
    background: var(--warning);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.95);
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: var(--spacing-lg);
    z-index: 9999;
}

.loading-overlay.active {
    display: flex;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-text {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Error Message */
.error-message {
    background: rgba(231, 111, 81, 0.1);
    border: 1px solid var(--error);
    color: var(--error);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-md);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .app-header {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .header-info h2 {
        font-size: 1rem;
    }
    
    .header-info p {
        display: none;
    }
    
    .user-info {
        display: none;
    }
    
    .app-content {
        padding: var(--spacing-md);
    }
    
    .content-card {
        padding: var(--spacing-lg);
    }
    
    .nav-tabs {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .tab-label {
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    
    .tab-icon {
        font-size: 1.25rem;
    }
}