/* 
 * DoodleSense AI - Main Stylesheet
 * Contains styles for all pages of the application
 */

/* ---------- Variables ---------- */
:root {
    /* Colors */
    --primary-color: #4f46e5;
    --primary-dark: #3730a3;
    --primary-light: #818cf8;
    --secondary-color: #10b981;
    --accent-color: #f97316;
    --dark-color: #111827;
    --gray-900: #1f2937;
    --gray-800: #374151;
    --gray-700: #4b5563;
    --gray-600: #6b7280;
    --gray-500: #9ca3af;
    --gray-400: #d1d5db;
    --gray-300: #e5e7eb;
    --gray-200: #f3f4f6;
    --gray-100: #f9fafb;
    --white: #ffffff;
    --error-color: #ef4444;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    
    /* Typography */
    --body-font: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    --heading-font: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Border radius */
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 1rem;
    --border-radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
    
    /* Container */
    --container-max-width: 1200px;
    --container-padding: 1rem;
}

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

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

body {
    font-family: var(--body-font);
    font-size: 1rem;
    line-height: 1.5;
    color: var(--gray-800);
    background-color: var(--gray-100);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--heading-font);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--gray-900);
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

h5 {
    font-size: 1.125rem;
}

h6 {
    font-size: 1rem;
}

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

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
}

ul, ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xl);
}

img {
    max-width: 100%;
    height: auto;
}

/* ---------- Container ---------- */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-block;
    font-family: var(--body-font);
    font-weight: 500;
    font-size: 1rem;
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast);
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    color: var(--white);
}

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

.btn-secondary:hover {
    background-color: var(--secondary-color);
    filter: brightness(90%);
    color: var(--white);
}

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

.btn-outline:hover {
    background-color: var(--primary-color);
    color: var(--white);
}

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

.btn-danger:hover {
    background-color: var(--error-color);
    filter: brightness(90%);
    color: var(--white);
}

.btn-large {
    padding: 0.75rem 1.5rem;
    font-size: 1.125rem;
}

.btn-small {
    padding: 0.25rem 0.75rem;
    font-size: 0.875rem;
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-icon i {
    margin-right: 0.5rem;
}

/* ---------- Forms ---------- */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--gray-800);
}

.form-control {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    color: var(--gray-900);
    background-color: var(--white);
    background-clip: padding-box;
    border: 1px solid var(--gray-400);
    border-radius: var(--border-radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
    border-color: var(--primary-light);
    outline: 0;
    box-shadow: 0 0 0 0.25rem rgba(79, 70, 229, 0.25);
}

.form-control::placeholder {
    color: var(--gray-500);
    opacity: 1;
}

.form-text {
    margin-top: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--gray-600);
}

.invalid-feedback {
    display: block;
    width: 100%;
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: var(--error-color);
}

/* Form validation states */
.is-valid {
    border-color: var(--success-color) !important;
}

.is-invalid {
    border-color: var(--error-color) !important;
}

/* Password strength meter */
.password-strength-meter {
    height: 5px;
    background-color: var(--gray-300);
    border-radius: var(--border-radius-full);
    margin-top: var(--spacing-sm);
    overflow: hidden;
}

.password-strength-meter-bar {
    height: 100%;
    border-radius: var(--border-radius-full);
    transition: width var(--transition-normal);
}

.strength-weak {
    width: 25%;
    background-color: var(--error-color);
}

.strength-medium {
    width: 50%;
    background-color: var(--warning-color);
}

.strength-good {
    width: 75%;
    background-color: var(--info-color);
}

.strength-strong {
    width: 100%;
    background-color: var(--success-color);
}

/* Password visibility toggle */
.password-field-container {
    position: relative;
}

.password-toggle {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--gray-600);
}

.password-toggle:hover {
    color: var(--gray-800);
}

/* ---------- Header & Navigation ---------- */
.header {
    background-color: var(--white);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

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

.logo img {
    height: 40px;
    margin-right: var(--spacing-sm);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0;
    color: var(--gray-900);
}

.logo span {
    color: var(--primary-color);
}

.main-nav {
    display: flex;
    align-items: center;
}

.nav-links {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-links li {
    margin-left: var(--spacing-lg);
}

.nav-links a {
    color: var(--gray-800);
    font-weight: 500;
}

.nav-links a:hover {
    color: var(--primary-color);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    background-color: var(--gray-800);
    transition: all var(--transition-fast);
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
        z-index: 1001;
    }
    
    .nav-links {
        position: fixed;
        left: -100%;
        top: 0;
        flex-direction: column;
        background-color: var(--white);
        width: 100%;
        height: 100vh;
        z-index: 1000;
        padding-top: 5rem;
        transition: left var(--transition-normal);
        align-items: center;
    }
    
    .nav-links.active {
        left: 0;
    }
    
    .nav-links li {
        margin: var(--spacing-md) 0;
    }
    
    .mobile-menu-toggle.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    
    .mobile-menu-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-toggle.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
}

/* ---------- Hero Section ---------- */
.hero {
    padding: var(--spacing-xxl) 0;
    background-color: var(--white);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: var(--spacing-lg);
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--gray-700);
    margin-bottom: var(--spacing-xl);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
}

.hero-image img {
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
}

.accent {
    color: var(--primary-color);
}

@media (max-width: 992px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }
}

@media (max-width: 768px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content {
        order: 1;
    }
    
    .hero-image {
        order: 0;
        margin-bottom: var(--spacing-xl);
    }
    
    .hero-buttons {
        justify-content: center;
    }
}

/* ---------- Features Section ---------- */
.features {
    padding: var(--spacing-xxl) 0;
    background-color: var(--gray-100);
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    font-size: 2.5rem;
}

.section-title::after {
    content: '';
    display: block;
    width: 50px;
    height: 4px;
    background-color: var(--primary-color);
    margin: var(--spacing-sm) auto 0;
    border-radius: var(--border-radius-full);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.feature-card {
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    text-align: center;
}

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

.feature-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.feature-card h3 {
    margin-bottom: var(--spacing-md);
}

.feature-card p {
    color: var(--gray-700);
    margin-bottom: 0;
}

@media (max-width: 992px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 576px) {
    .feature-grid {
        grid-template-columns: 1fr;
    }
}

/* ---------- How It Works Section ---------- */
.how-it-works {
    padding: var(--spacing-xxl) 0;
    background-color: var(--white);
}

.steps {
    display: flex;
    justify-content: space-between;
    max-width: 900px;
    margin: 0 auto;
}

.step {
    text-align: center;
    flex: 1;
    padding: 0 var(--spacing-md);
    position: relative;
}

.step:not(:last-child)::after {
    content: '';
    position: absolute;
    top: 30px;
    right: -50%;
    width: 100%;
    height: 3px;
    background-color: var(--gray-300);
    z-index: 0;
}

.step-number {
    width: 60px;
    height: 60px;
    background-color: var(--primary-color);
    color: var(--white);
    font-size: 1.5rem;
    font-weight: 700;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    position: relative;
    z-index: 1;
}

.step h3 {
    margin-bottom: var(--spacing-sm);
}

.step p {
    color: var(--gray-700);
    margin-bottom: 0;
}

@media (max-width: 768px) {
    .steps {
        flex-direction: column;
        gap: var(--spacing-xl);
    }
    
    .step:not(:last-child)::after {
        display: none;
    }
}

/* ---------- About Section ---------- */
.about {
    padding: var(--spacing-xxl) 0;
    background-color: var(--gray-100);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-content p {
    font-size: 1.1rem;
    color: var(--gray-700);
}

/* ---------- Footer ---------- */
.footer {
    background-color: var(--gray-900);
    color: var(--gray-300);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
}

.footer-logo {
    display: flex;
    align-items: center;
}

.footer-logo img {
    height: 40px;
    margin-right: var(--spacing-sm);
}

.footer-logo h2 {
    color: var(--white);
    margin-bottom: 0;
    font-size: 1.5rem;
}

.footer-logo span {
    color: var(--primary-light);
}

.footer-links {
    display: flex;
    gap: var(--spacing-xl);
}

.link-group h3 {
    color: var(--white);
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

.link-group ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.link-group li {
    margin-bottom: var(--spacing-sm);
}

.link-group a {
    color: var(--gray-400);
    transition: color var(--transition-fast);
}

.link-group a:hover {
    color: var(--white);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--gray-800);
}

.footer-bottom p {
    margin-bottom: 0;
    font-size: 0.9rem;
    color: var(--gray-500);
}

@media (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        gap: var(--spacing-xl);
    }
    
    .footer-logo {
        margin: 0 auto;
    }
    
    .footer-links {
        justify-content: center;
    }
}

@media (max-width: 576px) {
    .footer-links {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
}

/* ---------- Authentication Pages ---------- */
.auth-container {
    min-height: calc(100vh - 76px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl) 0;
}

.auth-form-container {
    width: 100%;
    max-width: 450px;
    background-color: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
}

.auth-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.auth-header h2 {
    margin-bottom: var(--spacing-sm);
}

.auth-footer {
    text-align: center;
    margin-top: var(--spacing-xl);
}

.oauth-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.btn-oauth {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    width: 100%;
    padding: var(--spacing-md);
    background-color: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius-md);
    font-weight: 500;
    transition: background-color var(--transition-fast);
}

.btn-oauth:hover {
    background-color: var(--gray-100);
}

.btn-oauth img {
    width: 24px;
    height: 24px;
}

.divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: var(--spacing-xl) 0;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--gray-300);
}

.divider span {
    padding: 0 var(--spacing-md);
    color: var(--gray-600);
    font-size: 0.9rem;
}

/* ---------- Dashboard ---------- */
.dashboard-container {
    display: flex;
    min-height: calc(100vh - 76px);
}

.sidebar {
    width: 280px;
    background-color: var(--white);
    border-right: 1px solid var(--gray-300);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.sidebar-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.sidebar-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-weight: 700;
    margin-right: var(--spacing-sm);
}

.sidebar-user-info h3 {
    font-size: 1rem;
    margin-bottom: 0;
}

.sidebar-user-info p {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-bottom: 0;
}

.sidebar-search {
    margin-bottom: var(--spacing-lg);
}

.search-input-container {
    position: relative;
}

.search-input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border-radius: var(--border-radius-md);
    border: 1px solid var(--gray-300);
    background-color: var(--gray-100);
    font-size: 0.9rem;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-500);
}

.sidebar-nav {
    margin-bottom: var(--spacing-lg);
}

.sidebar-nav-title {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--gray-600);
    margin-bottom: var(--spacing-sm);
}

.sidebar-nav-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-nav-links li {
    margin-bottom: var(--spacing-sm);
}

.sidebar-nav-links a {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    color: var(--gray-800);
    font-weight: 500;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.sidebar-nav-links a:hover,
.sidebar-nav-links a.active {
    background-color: var(--gray-100);
    color: var(--primary-color);
}

.sidebar-nav-links a i {
    margin-right: var(--spacing-md);
    width: 20px;
    text-align: center;
}

.sidebar-drawings {
    flex: 1;
    overflow-y: auto;
}

.sidebar-drawings-title {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.view-all {
    font-size: 0.8rem;
    color: var(--primary-color);
}

.drawing-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-sm);
    transition: background-color var(--transition-fast);
}

.drawing-item:hover {
    background-color: var(--gray-100);
}

.drawing-item-thumbnail {
    width: 50px;
    height: 50px;
    border-radius: var(--border-radius-sm);
    background-color: var(--gray-200);
    margin-right: var(--spacing-sm);
    object-fit: cover;
}

.drawing-item-info {
    flex: 1;
}

.drawing-item-info h4 {
    font-size: 0.9rem;
    margin-bottom: 0;
}

.drawing-item-info p {
    font-size: 0.8rem;
    color: var(--gray-600);
    margin-bottom: 0;
}

.dashboard-content {
    flex: 1;
    padding: var(--spacing-lg);
    background-color: var(--gray-100);
    overflow-y: auto;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.content-title h2 {
    margin-bottom: var(--spacing-xs);
}

.content-title p {
    color: var(--gray-600);
    margin-bottom: 0;
}

.dashboard-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.view-options {
    display: flex;
    gap: var(--spacing-sm);
    background-color: var(--gray-200);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-xs);
}

.view-option {
    background: none;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    color: var(--gray-700);
}

.view-option.active {
    background-color: var(--white);
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.dashboard-list {
    display: none;
}

.drawing-card {
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.drawing-card-image {
    height: 180px;
    background-color: var(--gray-200);
    overflow: hidden;
}

.drawing-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.drawing-card:hover .drawing-card-image img {
    transform: scale(1.05);
}

.drawing-card-content {
    padding: var(--spacing-md);
}

.drawing-card-title {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.drawing-card-description {
    color: var(--gray-700);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.drawing-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--gray-200);
}

.drawing-card-date {
    font-size: 0.8rem;
    color: var(--gray-600);
}

.drawing-card-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.card-action-btn {
    background: none;
    border: none;
    color: var(--gray-600);
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.card-action-btn:hover {
    color: var(--primary-color);
    background-color: var(--gray-100);
}

.empty-state {
    text-align: center;
    padding: var(--spacing-xxl) 0;
}

.empty-state-icon {
    font-size: 3rem;
    color: var(--gray-400);
    margin-bottom: var(--spacing-md);
}

.empty-state h3 {
    margin-bottom: var(--spacing-sm);
}

.empty-state p {
    color: var(--gray-600);
    max-width: 500px;
    margin: 0 auto var(--spacing-lg);
}

@media (max-width: 992px) {
    .sidebar {
        width: 240px;
    }
}

@media (max-width: 768px) {
    .dashboard-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--gray-300);
    }
    
    .sidebar-toggle {
        display: block;
    }
    
    .sidebar.collapsed .sidebar-nav,
    .sidebar.collapsed .sidebar-drawings {
        display: none;
    }
    
    .dashboard-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
}

/* ---------- Drawing Board ---------- */
.drawing-board-container {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 76px);
}

.drawing-board-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--white);
    border-bottom: 1px solid var(--gray-300);
}

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

.drawing-title h2 {
    margin-bottom: 0;
    font-size: 1.25rem;
}

.drawing-title-input {
    font-size: 1.25rem;
    font-weight: 700;
    border: none;
    border-bottom: 2px solid var(--primary-color);
    background-color: transparent;
    color: var(--gray-900);
    padding: var(--spacing-xs) 0;
    width: 300px;
}

.drawing-title-input:focus {
    outline: none;
}

.header-actions {
    display: flex;
    gap: var(--spacing-md);
}

.drawing-board-main {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.toolbar {
    width: 70px;
    background-color: var(--gray-900);
    padding: var(--spacing-md) 0;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.tool-group {
    margin-bottom: var(--spacing-lg);
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.tool-button {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
    background-color: transparent;
    border: none;
    border-radius: var(--border-radius-md);
    color: var(--gray-400);
    cursor: pointer;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.tool-button:hover {
    background-color: var(--gray-800);
    color: var(--white);
}

.tool-button.active {
    background-color: var(--primary-color);
    color: var(--white);
}

.tool-button i {
    font-size: 1.25rem;
}

.canvas-container {
    flex: 1;
    background-color: var(--gray-100);
    overflow: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

canvas {
    background-color: var(--white);
    box-shadow: var(--shadow-lg);
}

.panel {
    width: 300px;
    background-color: var(--white);
    border-left: 1px solid var(--gray-300);
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
}

.panel-section {
    margin-bottom: var(--spacing-lg);
}

.panel-section-title {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--gray-800);
}

.color-picker {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.color-option {
    width: 100%;
    aspect-ratio: 1 / 1;
    border-radius: var(--border-radius-sm);
    border: 2px solid transparent;
    cursor: pointer;
}

.color-option.active {
    border-color: var(--gray-900);
    box-shadow: var(--shadow-sm);
    transform: scale(1.1);
}

.color-custom {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.color-custom-input {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
}

.color-custom-input::-webkit-color-swatch-wrapper {
    padding: 0;
}

.color-custom-input::-webkit-color-swatch {
    border: none;
    border-radius: var(--border-radius-sm);
}

.color-hex-input {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius-sm);
}

.brush-size {
    margin-bottom: var(--spacing-md);
}

.brush-size-slider {
    width: 100%;
    -webkit-appearance: none;
    height: 5px;
    border-radius: var(--border-radius-full);
    background: var(--gray-300);
    outline: none;
}

.brush-size-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
}

.brush-size-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
}

.brush-size-value {
    margin-top: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--gray-700);
    text-align: center;
}

.shape-options {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.shape-option {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--gray-200);
    border: none;
    border-radius: var(--border-radius-md);
    color: var(--gray-800);
    cursor: pointer;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.shape-option:hover {
    background-color: var(--gray-300);
}

.shape-option.active {
    background-color: var(--primary-color);
    color: var(--white);
}

.action-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.recognition-results {
    flex: 1;
    overflow-y: auto;
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    background-color: var(--gray-100);
    margin-top: var(--spacing-md);
}

.recognition-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
}

.recognition-title i {
    margin-right: var(--spacing-sm);
    color: var(--primary-color);
}

.recognition-item {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--gray-300);
}

.recognition-item:last-child {
    border-bottom: none;
}

.recognition-label {
    font-weight: 500;
}

.recognition-confidence {
    color: var(--gray-700);
    font-size: 0.9rem;
}

.recognition-error {
    color: var(--error-color);
    font-style: italic;
}

.recognition-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg) 0;
    color: var(--gray-600);
}

.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--gray-300);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: var(--spacing-sm);
}

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

@media (max-width: 992px) {
    .panel {
        width: 250px;
    }
}

@media (max-width: 768px) {
    .drawing-board-main {
        flex-direction: column;
    }
    
    .toolbar {
        width: 100%;
        height: auto;
        flex-direction: row;
        justify-content: center;
        overflow-x: auto;
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .tool-group {
        flex-direction: row;
        margin-bottom: 0;
        margin-right: var(--spacing-md);
    }
    
    .tool-button {
        margin-right: var(--spacing-sm);
        margin-bottom: 0;
    }
    
    .panel {
        width: 100%;
        border-left: none;
        border-top: 1px solid var(--gray-300);
    }
}

/* ---------- Alerts & Notifications ---------- */
.alert {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    border: 1px solid transparent;
    border-radius: var(--border-radius-md);
}

.alert-success {
    background-color: rgba(16, 185, 129, 0.1);
    border-color: var(--success-color);
    color: var(--success-color);
}

.alert-danger {
    background-color: rgba(239, 68, 68, 0.1);
    border-color: var(--error-color);
    color: var(--error-color);
}

.alert-warning {
    background-color: rgba(245, 158, 11, 0.1);
    border-color: var(--warning-color);
    color: var(--warning-color);
}

.alert-info {
    background-color: rgba(59, 130, 246, 0.1);
    border-color: var(--info-color);
    color: var(--info-color);
}

/* ---------- Modals ---------- */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1050;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal-backdrop.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    width: 90%;
    max-width: 500px;
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    transform: translateY(-20px);
    transition: transform var(--transition-normal);
}

.modal-backdrop.active .modal {
    transform: translateY(0);
}

.modal-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-300);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    font-size: 1.25rem;
    margin-bottom: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-600);
    cursor: pointer;
    line-height: 1;
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--gray-300);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
}

/* ---------- Animations ---------- */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.fade-in {
    animation: fadeIn var(--transition-normal) forwards;
}

.slide-up {
    animation: slideUp var(--transition-normal) forwards;
}