:root {
    /* Modern SaaS Color Palette */
    --primary-gradient: linear-gradient(135deg, #14532d 0%, #22c55e 100%);
    --secondary-gradient: linear-gradient(135deg, #14532d 0%, #22c55e 100%);
    --success-gradient: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    --accent-gradient: linear-gradient(135deg, #14532d 0%, #22c55e 100%);

    /* Light Theme Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fc;
    --bg-tertiary: #f0f2f7;
    --bg-card: #ffffff;
    --bg-glass: rgba(255, 255, 255, 0.9);
    --bg-hover: #f8f9fc;

    /* Text Colors */
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    --text-accent: #22c55e;

    /* Border & Shadow */
    --border-color: #e2e8f0;
    --border-light: #f0f2f7;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 30px rgba(34, 197, 94, 0.15);
    --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.12);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Space Grotesk', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* 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: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: #cbd5e0;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #a0aec0;
}

/* App Container */
.app-container {
    height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
}

/* Header */
.header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo-icon {
    width: 32px;
    height: 32px;
    color: #22c55e;
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-base);
    padding: var(--spacing-xs) var(--spacing-sm);
}

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

.btn-new-chat {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--primary-gradient);
    border: none;
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.btn-new-chat:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

/* Main Content */
.main-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}

/* Welcome Screen */
.welcome-screen {
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.6s ease;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.welcome-content {
    text-align: center;
    max-width: 1000px;
}

.welcome-title {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
    animation: slideDown 0.8s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.welcome-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* Professional Hero Section */
.hero-section {
    position: relative;
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    animation: fadeInScale 0.8s ease-out;
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.95);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.hero-background {
    position: relative;
    height: 300px;
    overflow: hidden;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(20, 83, 45, 0.85) 0%, rgba(34, 197, 94, 0.85) 100%);
}

.hero-content-box {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: white;
    z-index: 2;
    width: 100%;
    padding: var(--spacing-lg);
}

.hero-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    margin-bottom: var(--spacing-md);
    color: white;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-10px);
    }
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
    font-family: var(--font-display);
}

.hero-tagline {
    font-size: 1.25rem;
    font-weight: 500;
    opacity: 0.95;
    text-shadow: 0 1px 10px rgba(0, 0, 0, 0.2);
}

/* Suggestion Cards */
.suggestion-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin: var(--spacing-xl) auto 0;
    max-width: 800px;
}

.suggestion-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    height: 100%;
}

.suggestion-card:hover {
    background: var(--bg-hover);
    border-color: var(--text-accent);
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.card-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-icon-img {
    width: 64px;
    height: 64px;
    object-fit: contain;
    filter: drop-shadow(0 4px 12px rgba(34, 197, 94, 0.2));
    transition: all var(--transition-base);
}

.suggestion-card:hover .card-icon-img {
    transform: scale(1.1) translateY(-4px);
    filter: drop-shadow(0 8px 20px rgba(34, 197, 94, 0.35));
}

.suggestion-card h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--text-primary);
}

.suggestion-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Chat Container */
.chat-container {
    min-height: 60vh;
    animation: fadeIn 0.4s ease;
}

.messages {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* Message Styles */
.message {
    display: flex;
    gap: var(--spacing-md);
    animation: messageSlide 0.3s ease;
}

@keyframes messageSlide {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.message.user .message-avatar {
    background: var(--primary-gradient);
}

.message.assistant .message-avatar {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
}

.message-content {
    flex: 1;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    color: var(--text-primary);
}

.message.user .message-content {
    background: var(--primary-gradient);
    border-color: transparent;
    color: white;
}

.message-content p {
    margin-bottom: var(--spacing-sm);
}

.message-content p:last-child {
    margin-bottom: 0;
}

.message-content ul,
.message-content ol {
    margin-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.message-content code {
    background: rgba(0, 0, 0, 0.3);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.message-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-xs);
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: var(--spacing-sm);
}

.typing-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-secondary);
    animation: typing 1.4s infinite;
}

.typing-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {

    0%,
    60%,
    100% {
        transform: translateY(0);
        opacity: 0.7;
    }

    30% {
        transform: translateY(-10px);
        opacity: 1;
    }
}

/* Input Area */
.input-area {
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-md) var(--spacing-lg);
    position: sticky;
    bottom: 0;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
}

.input-container {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-end;
}

.message-input {
    flex: 1;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 1rem;
    resize: none;
    max-height: 200px;
    transition: all var(--transition-base);
}

.message-input:focus {
    outline: none;
    border-color: var(--text-accent);
    box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.1);
}

.message-input::placeholder {
    color: var(--text-muted);
}

.send-button {
    width: 48px;
    height: 48px;
    background: var(--primary-gradient);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    flex-shrink: 0;
}

.send-button:hover:not(:disabled) {
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.send-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.input-footer {
    max-width: 900px;
    margin: var(--spacing-sm) auto 0;
    text-align: center;
}

.disclaimer {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Responsive Design */
@media (max-width: 992px) {
    .hero-title {
        font-size: 2.5rem;
    }
}

@media (max-width: 768px) {
    .welcome-title {
        font-size: 2rem;
    }

    .suggestion-cards {
        grid-template-columns: 1fr;
    }

    .header-content {
        padding: var(--spacing-sm) var(--spacing-md);
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }

    .nav {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }

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

    .input-area {
        padding: var(--spacing-sm);
    }

    /* Hero section mobile */
    .hero-section {
        margin: 0 0 var(--spacing-lg);
        border-radius: var(--radius-lg);
    }

    .hero-background {
        height: 220px;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .hero-tagline {
        font-size: 0.9rem;
    }

    .hero-icon {
        width: 50px;
        height: 50px;
        margin-bottom: var(--spacing-sm);
    }

    .hero-icon svg {
        width: 32px;
        height: 32px;
    }

    .message-content {
        padding: var(--spacing-sm);
        font-size: 0.95rem;
    }
}

@media (max-width: 480px) {
    .welcome-title {
        font-size: 1.75rem;
    }

    .hero-title {
        font-size: 1.5rem;
    }

    .btn-new-chat span {
        display: none;
    }

    .btn-new-chat {
        padding: var(--spacing-xs);
    }

    .logo-text {
        font-size: 1.25rem;
    }
}

/* Utilities */
.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn 0.4s ease;
}

/* How it Works Section */
.how-it-works {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
}

.section-title {
    font-family: var(--font-display);
    font-size: 2rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.step-card {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    position: relative;
    transition: all var(--transition-base);
}

.step-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--text-accent);
}

.step-num {
    position: absolute;
    top: -15px;
    left: 20px;
    width: 30px;
    height: 30px;
    background: var(--primary-gradient);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
    box-shadow: var(--shadow-sm);
}

.step-card h3 {
    margin-top: 10px;
    margin-bottom: 10px;
    font-size: 1.25rem;
}

.step-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Footer Styles */
.footer {
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-lg) 0;
    margin-top: auto;
}

.footer-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
}

.footer-info p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

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

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: color var(--transition-base);
}

.footer-links a:hover {
    color: var(--text-accent);
}

@media (max-width: 600px) {
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}