:root {
    /* ICP Color Palette - Based on the blue theme from image */
    --primary-color: #4A5FDF;
    --primary-dark: #3B4EC7;
    --primary-light: #6B7EE6;
    --secondary-color: #5B6CD9;
    --accent-color: #7B8DEF;
    
    /* Additional Colors */
    --white: #FFFFFF;
    --gray-50: #F8FAFC;
    --gray-100: #F1F5F9;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-400: #94A3B8;
    --gray-500: #64748B;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1E293B;
    --gray-900: #0F172A;
    
    /* Success, Warning, Error */
    --success-color: #10B981;
    --warning-color: #F59E0B;
    --error-color: #EF4444;
    
    /* Typography */
    --font-kanit: 'Kanit', sans-serif;
    --font-inter: 'Inter', sans-serif;
    
    /* Spacing */
    --container-max-width: 1200px;
    --section-padding: 80px 0;
    --border-radius: 12px;
    --border-radius-lg: 20px;
    
    /* 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);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-kanit);
    line-height: 1.6;
    color: var(--gray-700);
    background-color: var(--white);
}

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

/* Container */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-kanit);
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--gray-800);
}

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

p {
    margin-bottom: 1rem;
    font-family: var(--font-inter);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    font-family: var(--font-kanit);
    font-weight: 500;
    text-decoration: none;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Navigation */
.navbar {
    background-color: var(--white);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
    max-width: var(--container-max-width);
    margin: 0 auto;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.25rem;
}

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

.nav-logo {
    height: 40px;
    width: auto;
    object-fit: contain;
    transition: height 0.3s ease;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--gray-600);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--primary-color);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: var(--gray-600);
    margin: 3px 0;
    transition: 0.3s;
}

/* Main Content */
.main-content {
    padding-top: 0;
}

/* Hero Section */
.hero {
    padding: var(--section-padding);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

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

.hero-description {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

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

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

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

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

/* Image Placeholders */
.image-placeholder {
    background-color: var(--gray-100);
    border: 2px dashed var(--gray-300);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--gray-500);
}

.image-placeholder.large {
    min-height: 300px;
}

.image-placeholder i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--gray-400);
}

/* Step Icons - Colorful */
.step-card:nth-child(1) .image-placeholder i {
    color: #FF6B6B;
    background: linear-gradient(135deg, #FF6B6B, #FF8E53);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.step-card:nth-child(2) .image-placeholder i {
    color: #4ECDC4;
    background: linear-gradient(135deg, #4ECDC4, #44A08D);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.step-card:nth-child(3) .image-placeholder i {
    color: #66BB6A;
    background: linear-gradient(135deg, #A8E6CF, #66BB6A);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.step-card:nth-child(4) .image-placeholder i {
    color: #FFD93D;
    background: linear-gradient(135deg, #FFD93D, #FF8A65);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero .image-placeholder {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.3);
    color: rgba(255, 255, 255, 0.8);
    min-height: 400px;
}

.hero .image-placeholder i {
    color: rgba(255, 255, 255, 0.6);
    font-size: 4rem;
}

/* Sections */
.features-overview,
.quick-start,
.rtc-preview,
.upload-section {
    padding: var(--section-padding);
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--gray-800);
}

/* AI Grid */
.ai-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(2, 1fr);
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.ai-card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.ai-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    color: var(--white);
}

.ai-icon.chatgpt { background: #FFFFFF; }
.ai-icon.claude { background: #FFFFFF; }
.ai-icon.gemini { background: #FFFFFF; }
.ai-icon.perplexity { background: #FFFFFF; }

.ai-card h3 {
    margin-bottom: 1rem;
    color: var(--gray-800);
}

.ai-card p {
    color: var(--gray-600);
    font-size: 0.95rem;
}

/* Steps Grid */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(2, 1fr);
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.step-card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    position: relative;
    transition: transform 0.3s ease;
}

.step-card:hover {
    transform: translateY(-5px);
}

.step-number {
    position: absolute;
    top: -15px;
    left: 2rem;
    color: var(--white);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
}

.step-card:nth-child(1) .step-number {
    background: linear-gradient(135deg, #FF6B6B, #FF8E53);
}

.step-card:nth-child(2) .step-number {
    background: linear-gradient(135deg, #4ECDC4, #44A08D);
}

.step-card:nth-child(3) .step-number {
    background: linear-gradient(135deg, #A8E6CF, #66BB6A);
}

.step-card:nth-child(4) .step-number {
    background: linear-gradient(135deg, #FFD93D, #FF8A65);
}

.step-content {
    padding-top: 1rem;
}

.step-content h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.step-content .image-placeholder {
    margin-top: 1.5rem;
    min-height: 150px;
}

/* RTC Preview */
.rtc-preview {
    background-color: var(--gray-50);
}

.rtc-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.rtc-description {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    color: var(--gray-600);
}

.rtc-framework {
    margin-bottom: 2rem;
}

.rtc-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.rtc-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--white);
}

.rtc-icon.role { background-color: #EF4444; }
.rtc-icon.task { background-color: #10B981; }
.rtc-icon.context { background-color: #8B5CF6; }

.rtc-item h4 {
    margin-bottom: 0.25rem;
    color: var(--gray-800);
}

.rtc-item p {
    margin-bottom: 0;
    color: var(--gray-600);
    font-size: 0.9rem;
}

.rtc-example {
    margin-top: 0.5rem;
    padding: 0.5rem 0.75rem;
    background-color: var(--gray-100);
    border-radius: var(--border-radius);
    font-size: 0.85rem;
    color: var(--gray-700);
}

.rtc-example strong {
    color: var(--primary-color);
}

.rtc-result {
    margin: 2rem 0;
    padding: 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--border-radius-lg);
    color: var(--white);
}

.rtc-result h4 {
    margin-bottom: 1rem;
    color: var(--white);
    font-size: 1.1rem;
}

.rtc-result i {
    color: var(--accent-color);
    margin-right: 0.5rem;
}

.prompt-box {
    background: rgba(255, 255, 255, 0.15);
    padding: 1rem;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--accent-color);
    font-size: 1.1rem;
    line-height: 1.4;
}

/* Upload Section */
.upload-section {
    background-color: var(--gray-50);
}

.upload-description {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--gray-600);
}

.upload-container {
    max-width: 800px;
    margin: 0 auto;
}

.upload-zone {
    border: 2px dashed var(--gray-300);
    border-radius: var(--border-radius-lg);
    padding: 3rem 2rem;
    text-align: center;
    background-color: var(--white);
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-zone:hover {
    border-color: var(--primary-color);
    background-color: var(--gray-50);
}

.upload-zone.dragover {
    border-color: var(--primary-color);
    background-color: var(--primary-light);
    background-opacity: 0.1;
}

.upload-zone i {
    font-size: 3rem;
    color: var(--gray-400);
    margin-bottom: 1rem;
}

.upload-zone h3 {
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

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

.uploaded-images {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.uploaded-image {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.uploaded-image img {
    width: 100%;
    height: 150px;
    object-fit: cover;
}

.image-info {
    padding: 1rem;
    background-color: var(--white);
}

.image-info h4 {
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
    color: var(--gray-800);
}

.image-info p {
    font-size: 0.8rem;
    color: var(--gray-500);
    margin-bottom: 0;
}

.remove-image {
    position: absolute;
    top: 5px;
    right: 5px;
    background-color: var(--error-color);
    color: var(--white);
    border: none;
    border-radius: 50%;
    width: 25px;
    height: 25px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Hide remove button for placeholder images */
.remove-placeholder-image {
    display: none !important;
}

/* Hide image filename overlay */
.image-info-overlay {
    display: none !important;
}

/* Footer */
.footer {
    background-color: var(--gray-800);
    color: var(--gray-300);
    padding: 2rem 0;
    margin-top: 4rem;
}

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

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--white);
    font-weight: 600;
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.footer-logo {
    height: 32px;
    width: auto;
    object-fit: contain;
    filter: brightness(0) invert(1); /* Make logo white for dark footer */
    transition: opacity 0.3s ease;
}

.footer-logo:hover {
    opacity: 0.8;
}

.footer-left p {
    margin-bottom: 0;
    font-size: 0.9rem;
}

.footer-right p {
    margin-bottom: 0;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-content,
    .rtc-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .ai-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .steps-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--white);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-lg);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .nav-toggle.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    
    .hero {
        padding: 3rem 0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .nav-logo {
        height: 35px;
    }
    
    .footer-logo {
        height: 28px;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .ai-grid {
        grid-template-columns: 1fr;
        grid-template-rows: auto;
        gap: 1.5rem;
    }
    
    .steps-grid {
        grid-template-columns: 1fr;
        grid-template-rows: auto;
        gap: 1.5rem;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .upload-zone {
        padding: 2rem 1rem;
    }
    
    .uploaded-images {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
    
    .step-number {
        width: 35px;
        height: 35px;
        font-size: 1rem;
    }
    
    .rtc-icon {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.6s ease-in-out;
}

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

.slide-in-left {
    animation: slideInLeft 0.6s ease-in-out;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.slide-in-right {
    animation: slideInRight 0.6s ease-in-out;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.spinner {
    border: 2px solid var(--gray-200);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

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