/* Main Styles - lucAI Foundation */

/* Reset and Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Luca Ecosystem Brand Colors */
    --luca-navy: #1D2D44;
    --luca-white: #F5F5F3;
    --luca-gold: #AE9D5D;
    --luca-gold-hover: #C4B373;
    --luca-azure: #00BBFF;
    --luca-viridian: #00FF00;
    --luca-tangerine: #FF8C00;
    
    /* lucAI Product Colors */
    --lucai-accent: var(--luca-gold);
    --lucai-accent-hover: var(--luca-gold-hover);
    
    /* Font Families */
    --font-display: 'Manrope', sans-serif;
    --font-body: 'DM Sans', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --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);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

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

/* Utility Classes */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

.hidden {
    display: none !important;
}

/* Loading State */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    gap: var(--spacing-lg);
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--luca-white);
    border-top-color: var(--lucai-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Error State */
.error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    gap: var(--spacing-lg);
    text-align: center;
    padding: var(--spacing-xl);
}

.error-state h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
}

.error-state p {
    color: var(--text-secondary);
    max-width: 500px;
}

.error-state button {
    margin-top: var(--spacing-md);
}

/* Theme Toggle Button */
.theme-toggle {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    background: var(--glass-bg);
    border: 1px solid var(--glass-edge);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    transition: all var(--transition-base);
    color: var(--text-primary);
}

.theme-toggle:hover {
    background: var(--glass-hover);
    transform: scale(1.05);
}

.theme-toggle .icon-sun {
    display: none;
}

.theme-toggle .icon-moon {
    display: block;
}

[data-theme="light"] .theme-toggle .icon-sun {
    display: block;
}

[data-theme="light"] .theme-toggle .icon-moon {
    display: none;
}

/* Responsive Design */
@media (max-width: 768px) {
    .theme-toggle {
        top: var(--spacing-md);
        right: var(--spacing-md);
        width: 36px;
        height: 36px;
    }
}

/* Theme Toggle Small (for sidebar) */
.theme-toggle-small {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-md);
    background: var(--glass-bg);
    border: 1px solid var(--glass-edge);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    color: var(--text-primary);
}

.theme-toggle-small:hover {
    background: var(--glass-hover);
}

.theme-toggle-small .icon-sun {
    display: none;
}

.theme-toggle-small .icon-moon {
    display: block;
}

[data-theme="light"] .theme-toggle-small .icon-sun {
    display: block;
}

[data-theme="light"] .theme-toggle-small .icon-moon {
    display: none;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--text-muted);
}

.empty-state p {
    font-size: 0.875rem;
}

/* New Chat Button */
.new-chat-btn {
    margin: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-active));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
}

.new-chat-btn:hover {
    background: linear-gradient(135deg, var(--accent-hover), var(--accent-primary));
    transform: translateY(-1px);
}

/* Auth Styles */
.auth-view {
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
}

.auth-container {
    width: 100%;
    max-width: 420px;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
}

.auth-logo {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-active));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: bold;
    color: white;
}

.auth-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.auth-subtitle {
    color: var(--text-muted);
    margin-bottom: var(--spacing-xl);
    font-size: 0.9rem;
    text-align: center;
}

.auth-message {
    font-size: 0.875rem;
    margin-top: var(--spacing-lg);
    min-height: 1.25rem;
    text-align: center;
    color: var(--text-secondary);
}

/* Button Styles */
.luc-btn {
    font-family: var(--font-body);
    font-weight: 600;
    transition: all var(--transition-base);
}

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

.luc-btn-primary:hover {
    background: linear-gradient(135deg, var(--accent-hover), var(--accent-primary));
    transform: translateY(-1px);
}

.luc-btn-outline {
    background: transparent;
    border: 1px solid var(--border-primary);
    color: var(--text-primary);
}

.luc-btn-outline:hover {
    background: var(--background-tertiary);
}

/* LucUI overrides for brand consistency */
.luc-input {
    background: var(--background-tertiary);
    border-color: var(--border-primary);
    color: var(--text-primary);
}

.luc-input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(174, 157, 93, 0.1);
}

.luc-label {
    color: var(--text-secondary);
}