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

:root {
    /* Colors - Professional slate/teal palette */
    --color-primary: #1e3a5f;
    --color-primary-light: #2d4a6f;
    --color-primary-dark: #142844;
    --color-accent: #2a9d8f;
    --color-accent-light: #3ab7a7;
    --color-accent-dark: #1f7a6f;
    --color-text: #1f2937;
    --color-text-secondary: #4b5563;
    --color-text-light: #6b7280;
    --color-text-muted: #9ca3af;
    --color-bg: #f8fafc;
    --color-bg-alt: #f1f5f9;
    --color-bg-card: #ffffff;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;

    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;

    /* Borders */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --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;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Header height for scroll offset */
    --header-height: 60px;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
}

/* ===== Sticky Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--color-bg-card);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
}

.header-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--spacing-6);
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-logo {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-2);
    text-decoration: none;
    color: var(--color-primary);
}

.logo-mark {
    font-size: var(--font-size-xl);
    font-weight: 700;
    letter-spacing: 0.05em;
}

.logo-text {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
}

.header-nav {
    display: flex;
    gap: var(--spacing-6);
}

.nav-link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* ===== Layout ===== */
.page-wrapper {
    padding-top: var(--header-height);
}

.container {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--spacing-6);
}

.section {
    padding: var(--spacing-16) 0;
}

.section-alt {
    background: var(--color-bg-alt);
}

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-primary);
    text-align: center;
    margin-bottom: var(--spacing-4);
}

.section-subtitle {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--spacing-10);
}

/* ===== Hero Section ===== */
.hero {
    padding: var(--spacing-20) 0;
    text-align: center;
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.2;
    margin-bottom: var(--spacing-6);
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 560px;
    margin: 0 auto var(--spacing-10);
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-4);
    flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-6);
    font-size: var(--font-size-base);
    font-weight: 600;
    font-family: inherit;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    border: 2px solid transparent;
}

.btn-icon {
    width: 18px;
    height: 18px;
}

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

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

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

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

/* ===== Features Grid ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-8);
}

.feature {
    text-align: center;
}

.feature-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--spacing-4);
    background: var(--color-accent);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon svg {
    width: 24px;
    height: 24px;
    stroke: white;
}

.feature h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-2);
}

.feature p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ===== Contact Card ===== */
.contact-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-8);
    max-width: 500px;
    margin: 0 auto;
}

.contact-info {
    text-align: center;
}

.contact-person {
    margin-bottom: var(--spacing-6);
}

.contact-name {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text);
}

.contact-title {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
    align-items: center;
}

.contact-method {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-3);
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.contact-method:hover {
    color: var(--color-accent-dark);
}

.contact-icon {
    width: 20px;
    height: 20px;
}

/* ===== AI Assistant Card ===== */
.ai-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    max-width: 600px;
    margin: 0 auto;
}

.ai-header {
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-6);
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.ai-icon {
    width: 48px;
    height: 48px;
    background: rgba(255,255,255,0.15);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.ai-icon svg {
    width: 24px;
    height: 24px;
}

.ai-header-text h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-1);
}

.ai-subtitle {
    font-size: var(--font-size-sm);
    opacity: 0.85;
}

.ai-body {
    padding: var(--spacing-6);
}

.ai-body > p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-6);
    line-height: 1.6;
}

.ai-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-3);
}

.ai-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    padding: var(--spacing-4);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
}

.ai-option:hover {
    border-color: var(--color-accent);
    background: var(--color-bg-card);
}

.ai-option svg {
    width: 20px;
    height: 20px;
    stroke: var(--color-accent);
    flex-shrink: 0;
}

/* ===== Disclosure Links ===== */
.disclosure-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
    max-width: 600px;
    margin: 0 auto;
}

.disclosure-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    background: var(--color-bg-card);
    padding: var(--spacing-5);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: inherit;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

.disclosure-link:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.disclosure-icon {
    width: 44px;
    height: 44px;
    background: var(--color-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.disclosure-icon svg {
    width: 22px;
    height: 22px;
    stroke: white;
}

.disclosure-content {
    flex: 1;
}

.disclosure-title {
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-1);
}

.disclosure-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.disclosure-arrow {
    width: 20px;
    height: 20px;
    color: var(--color-text-light);
    flex-shrink: 0;
}

/* ===== Footer ===== */
.footer {
    background: var(--color-primary-dark);
    color: rgba(255, 255, 255, 0.9);
    padding: var(--spacing-12) 0 var(--spacing-8);
}

.footer-main {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: var(--spacing-8);
    border-bottom: 1px solid rgba(255,255,255,0.1);
    margin-bottom: var(--spacing-8);
}

.footer-logo {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-2);
}

.footer-logo .logo-mark {
    color: white;
}

.footer-logo .logo-text {
    color: rgba(255,255,255,0.7);
}

.footer-links {
    display: flex;
    gap: var(--spacing-6);
}

.footer-links a {
    font-size: var(--font-size-sm);
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: white;
}

.footer-disclosures {
    font-size: var(--font-size-xs);
    color: rgba(255,255,255,0.6);
    line-height: 1.7;
}

.footer-disclosures p {
    margin-bottom: var(--spacing-4);
}

.footer-bottom {
    margin-top: var(--spacing-8);
    padding-top: var(--spacing-6);
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: var(--font-size-xs);
    color: rgba(255,255,255,0.5);
}

/* ===== Chat Widget ===== */
.chat-widget {
    position: fixed;
    bottom: 100px;
    right: 20px;
    width: 380px;
    max-width: calc(100vw - 40px);
    height: 550px;
    max-height: calc(100vh - 140px);
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    display: none;
    flex-direction: column;
    z-index: 1000;
    overflow: hidden;
}

.chat-widget.open {
    display: flex;
}

.chat-header {
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-4);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-header-title {
    font-weight: 600;
    font-size: var(--font-size-base);
}

.chat-header-subtitle {
    font-size: var(--font-size-xs);
    opacity: 0.8;
}

.chat-close {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    padding: var(--spacing-2);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.chat-close:hover {
    background: rgba(255, 255, 255, 0.1);
}

.chat-close svg {
    width: 20px;
    height: 20px;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-4);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
}

.chat-message {
    max-width: 85%;
}

.chat-message.assistant {
    align-self: flex-start;
}

.chat-message.user {
    align-self: flex-end;
}

.message-content {
    background: var(--color-bg);
    padding: var(--spacing-3) var(--spacing-4);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
}

.chat-message.user .message-content {
    background: var(--color-accent);
    color: white;
}

.message-content p {
    margin-bottom: var(--spacing-2);
}

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

.chat-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
    padding: var(--spacing-2) 0;
}

.chat-option {
    background: white;
    border: 1px solid var(--color-border);
    padding: var(--spacing-3) var(--spacing-4);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
}

.chat-option:hover {
    border-color: var(--color-accent);
    background: var(--color-bg);
}

.chat-input-area {
    display: flex;
    gap: var(--spacing-2);
    padding: var(--spacing-4);
    border-top: 1px solid var(--color-border);
}

.chat-input {
    flex: 1;
    border: 1px solid var(--color-border);
    padding: var(--spacing-3);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    font-family: inherit;
}

.chat-input:focus {
    outline: none;
    border-color: var(--color-accent);
}

.chat-input:disabled {
    background: var(--color-bg);
    cursor: not-allowed;
}

.chat-send {
    background: var(--color-accent);
    color: white;
    border: none;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-lg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-fast);
}

.chat-send:hover:not(:disabled) {
    background: var(--color-accent-dark);
}

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

.chat-send svg {
    width: 20px;
    height: 20px;
}

.chat-footer {
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
    text-align: center;
    padding: var(--spacing-2) var(--spacing-4);
    background: var(--color-bg);
    border-top: 1px solid var(--color-border-light);
}

/* Chat Toggle Button */
.chat-toggle {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--color-accent);
    color: white;
    border: none;
    padding: var(--spacing-3) var(--spacing-5);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    box-shadow: var(--shadow-lg);
    z-index: 999;
    transition: all var(--transition-base);
    font-family: inherit;
}

.chat-toggle:hover {
    background: var(--color-accent-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.chat-toggle.hidden {
    display: none;
}

.chat-toggle svg {
    width: 20px;
    height: 20px;
}

/* Typing indicator */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: var(--spacing-3) var(--spacing-4);
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    width: fit-content;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--color-text-light);
    border-radius: 50%;
    animation: typing 1.4s infinite both;
}

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

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

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.4;
    }
    30% {
        transform: translateY(-4px);
        opacity: 1;
    }
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    :root {
        --header-height: 56px;
    }

    .header-nav {
        gap: var(--spacing-4);
    }

    .nav-link {
        font-size: var(--font-size-xs);
    }

    .container {
        padding: 0 var(--spacing-4);
    }

    .hero {
        padding: var(--spacing-12) 0;
    }

    .hero-title {
        font-size: var(--font-size-3xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-base);
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }

    .section {
        padding: var(--spacing-12) 0;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-8);
    }

    .ai-options {
        grid-template-columns: 1fr;
    }

    .footer-main {
        flex-direction: column;
        gap: var(--spacing-6);
        text-align: center;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    .chat-widget {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        width: 100%;
        max-width: 100%;
        height: 100%;
        max-height: 100%;
        border-radius: 0;
    }

    .chat-toggle span {
        display: none;
    }

    .chat-toggle {
        width: 56px;
        height: 56px;
        padding: 0;
        justify-content: center;
    }

    .chat-toggle svg {
        width: 24px;
        height: 24px;
    }
}

/* Focus states for accessibility */
a:focus,
button:focus,
input:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    html {
        scroll-behavior: auto;
    }
}