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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* CSS Custom Properties (Design System) */
:root {
    /* Colors */
    --bg: #0B0F12;
    --surface: #121821;
    --text: #E6EDF3;
    --muted: #9FB0C3;
    --accent: #7CFFCA;
    --accent-2: #FF5C8A;
    --border: #1F2A37;
    
    /* Typography */
    --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;
    
    /* Border radius */
    --radius: 16px;
    --radius-sm: 8px;
    
    /* Shadows */
    --shadow: 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);
    
    /* Transitions */
    --transition: 200ms ease;
    --transition-slow: 300ms ease;
}

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--space-lg);
    }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--space-sm);
}

h1 {
    font-size: 2.5rem;
    line-height: 1.1;
}

h2 {
    font-size: 1.75rem;
    line-height: 1.3;
}

h3 {
    font-size: 1.25rem;
    line-height: 1.4;
}

@media (min-width: 768px) {
    h1 {
        font-size: 3rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    h3 {
        font-size: 1.5rem;
    }
}

p {
    margin-bottom: var(--space-sm);
}

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

a:hover {
    color: var(--accent-2);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-lg);
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 1rem;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition);
    min-height: 48px;
}

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

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

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

.btn--secondary:hover {
    background-color: var(--surface);
    border-color: var(--accent);
    color: var(--accent);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(11, 15, 18, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    transition: all var(--transition);
}

.header__content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) 0;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
    text-decoration: none;
}

.logo:hover {
    color: var(--accent);
}

/* Navigation */
.nav__list {
    display: flex;
    list-style: none;
    gap: var(--space-lg);
}

.nav__link {
    color: var(--muted);
    font-weight: 500;
    transition: color var(--transition);
    position: relative;
}

.nav__link:hover {
    color: var(--text);
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent);
    transition: width var(--transition);
}

.nav__link:hover::after {
    width: 100%;
}

/* Mobile Menu Toggle */
.header__menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs);
}

.menu-toggle__line {
    width: 24px;
    height: 2px;
    background-color: var(--text);
    transition: all var(--transition);
}

.header__menu-toggle[aria-expanded="true"] .menu-toggle__line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.header__menu-toggle[aria-expanded="true"] .menu-toggle__line:nth-child(2) {
    opacity: 0;
}

.header__menu-toggle[aria-expanded="true"] .menu-toggle__line:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

@media (max-width: 767px) {
    .header__menu-toggle {
        display: flex;
    }
    
    .header__nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--surface);
        border-top: 1px solid var(--border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition);
        z-index: 999;
    }
    
    .header__nav[aria-expanded="true"] {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav__list {
        flex-direction: column;
        padding: var(--space-md);
        gap: 0;
    }
    
    .nav__link {
        padding: var(--space-sm) 0;
        border-bottom: 1px solid var(--border);
        display: block;
        width: 100%;
    }
    
    .nav__link:last-child {
        border-bottom: none;
    }
}

/* Hero Section */
.hero {
    padding: calc(80px + var(--space-3xl)) 0 var(--space-3xl);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero__content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
    align-items: center;
}

@media (min-width: 768px) {
    .hero__content {
        grid-template-columns: 1fr 1fr;
    }
}

.hero__title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
    background: linear-gradient(135deg, var(--text) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

@media (min-width: 768px) {
    .hero__title {
        font-size: 4rem;
    }
}

.hero__subtitle {
    font-size: 1.25rem;
    color: var(--muted);
    margin-bottom: var(--space-lg);
}

.hero__stats {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
}

@media (min-width: 480px) {
    .hero__stats {
        flex-direction: row;
        flex-wrap: wrap;
    }
}

.stat-pill {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.875rem;
}

.stat-pill__label {
    color: var(--muted);
}

.stat-pill__value {
    color: var(--accent);
    font-weight: 600;
}

.stat-pill__note {
    color: var(--muted);
    font-size: 0.75rem;
}

.hero__ctas {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

@media (min-width: 480px) {
    .hero__ctas {
        flex-direction: row;
    }
}

.hero__note {
    color: var(--muted);
    font-size: 0.875rem;
}

.hero__image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero__avatar {
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition);
}

.hero__avatar:hover {
    transform: scale(1.02);
}

/* Section Styles */
section {
    padding: var(--space-3xl) 0;
}

.section__title {
    text-align: center;
    margin-bottom: var(--space-2xl);
    font-size: 2rem;
}

@media (min-width: 768px) {
    .section__title {
        font-size: 2.5rem;
    }
}

/* About Section */
.about__intro {
    font-size: 1.25rem;
    color: var(--muted);
    margin-bottom: var(--space-lg);
    text-align: center;
}

.about__expanded {
    margin-bottom: var(--space-xl);
}

.about__expanded p {
    margin-bottom: var(--space-md);
    text-align: center;
}

.about__chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    justify-content: center;
}

.chip {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: var(--muted);
    transition: all var(--transition);
}

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

/* Expertise Section */
.expertise {
    background-color: var(--surface);
}

.expertise__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
}

@media (min-width: 768px) {
    .expertise__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .expertise__grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.expertise__card {
    background-color: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--space-lg);
    text-align: center;
    transition: all var(--transition);
}

.expertise__card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.expertise__icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--space-md);
    color: var(--accent);
}

.expertise__title {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
    color: var(--text);
}

.expertise__description {
    color: var(--muted);
    font-size: 0.875rem;
}

/* Methodology Section */
.methodology__content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
    align-items: start;
}

@media (min-width: 768px) {
    .methodology__content {
        grid-template-columns: 2fr 1fr;
    }
}

.methodology__steps {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
}

@media (min-width: 768px) {
    .methodology__steps {
        grid-template-columns: repeat(3, 1fr);
    }
}

.methodology__step {
    text-align: center;
}

.step__number {
    width: 60px;
    height: 60px;
    background-color: var(--accent);
    color: var(--bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto var(--space-md);
}

.step__title {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
    color: var(--text);
}

.step__description {
    color: var(--muted);
    font-size: 0.875rem;
}

.methodology__checklist {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--space-lg);
}

.checklist__title {
    font-size: 1.25rem;
    margin-bottom: var(--space-md);
    color: var(--text);
}

.checklist__list {
    list-style: none;
    margin-bottom: var(--space-lg);
}

.checklist__item {
    padding: var(--space-xs) 0;
    color: var(--muted);
    font-size: 0.875rem;
    position: relative;
    padding-left: var(--space-md);
}

.checklist__item::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 600;
}

/* Insights Section */
.insights {
    background-color: var(--surface);
}

.insights__carousel {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius);
}

.carousel__container {
    display: flex;
    transition: transform var(--transition-slow);
}

.carousel__slide {
    min-width: 100%;
    padding: 0 var(--space-sm);
}

.carousel__controls {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
}

.carousel__button {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: none;
    background-color: var(--border);
    cursor: pointer;
    transition: all var(--transition);
}

.carousel__button.active {
    background-color: var(--accent);
}

.carousel__button:hover {
    background-color: var(--accent-2);
}

.carousel__nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background-color: var(--bg);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition);
    z-index: 10;
}

.carousel__nav:hover {
    background-color: var(--accent);
    border-color: var(--accent);
}

.carousel__nav:hover svg {
    color: var(--bg);
}

.carousel__nav--prev {
    left: var(--space-sm);
}

.carousel__nav--next {
    right: var(--space-sm);
}

.carousel__nav svg {
    width: 20px;
    height: 20px;
    color: var(--text);
    transition: color var(--transition);
}

@media (max-width: 767px) {
    .carousel__nav {
        display: none;
    }
    
    .carousel__slide {
        padding: 0;
    }
}

.insight__card {
    background-color: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--space-lg);
    transition: all var(--transition);
}

.insight__card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.insight__title {
    font-size: 1.125rem;
    margin-bottom: var(--space-sm);
    color: var(--text);
}

.insight__summary {
    color: var(--muted);
    font-size: 0.875rem;
    margin-bottom: var(--space-md);
}

.insight__link {
    color: var(--accent);
    font-weight: 500;
    font-size: 0.875rem;
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    transition: all var(--transition);
}

.insight__link:hover {
    color: var(--accent-2);
    transform: translateX(4px);
}

/* FAQ Section */
.faq__list {
    max-width: 800px;
    margin: 0 auto;
}

.faq__item {
    border-bottom: 1px solid var(--border);
}

.faq__item:last-child {
    border-bottom: none;
}

.faq__question {
    width: 100%;
    background: none;
    border: none;
    padding: var(--space-lg) 0;
    text-align: left;
    color: var(--text);
    font-size: 1.125rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: color var(--transition);
}

.faq__question:hover {
    color: var(--accent);
}

.faq__icon {
    color: var(--muted);
    transition: all var(--transition);
    flex-shrink: 0;
    margin-left: var(--space-sm);
}

.faq__item[aria-expanded="true"] .faq__icon {
    transform: rotate(180deg);
    color: var(--accent);
}

.faq__answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition);
}

.faq__item[aria-expanded="true"] .faq__answer {
    max-height: 200px;
}

.faq__answer p {
    padding-bottom: var(--space-lg);
    color: var(--muted);
    margin: 0;
}

/* Contact Section */
.contact {
    background-color: var(--surface);
}

.contact__content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact__email {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--accent);
    margin-bottom: var(--space-xl);
    transition: color var(--transition);
}

.contact__email:hover {
    color: var(--accent-2);
}

.contact__socials {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.social__link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--muted);
    font-weight: 500;
    transition: color var(--transition);
}

.social__link:hover {
    color: var(--accent);
}

.contact__form {
    display: grid;
    gap: var(--space-md);
    text-align: left;
}

.form__group {
    display: flex;
    flex-direction: column;
}

.form__input,
.form__textarea {
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background-color: var(--bg);
    color: var(--text);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color var(--transition);
}

.form__input:focus,
.form__textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.form__textarea {
    resize: vertical;
    min-height: 120px;
}

/* Footer */
.footer {
    background-color: var(--bg);
    border-top: 1px solid var(--border);
    padding: var(--space-xl) 0;
}

.footer__content {
    text-align: center;
}

.footer__copyright {
    color: var(--muted);
    margin-bottom: var(--space-sm);
}

.footer__disclaimer {
    color: var(--muted);
    font-size: 0.875rem;
    margin-bottom: var(--space-md);
}

.footer__nav {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
}

.footer__link {
    color: var(--muted);
    font-size: 0.875rem;
    transition: color var(--transition);
}

.footer__link:hover {
    color: var(--accent);
}

/* Animation Classes */
.animate-in {
    animation: fadeInUp 0.6s ease forwards;
}

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

/* Header scroll effect */
.header--scrolled {
    background-color: rgba(11, 15, 18, 0.98);
    backdrop-filter: blur(15px);
}

/* 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: 0;
}

/* Focus styles for accessibility */
*:focus {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

button:focus,
a:focus {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border: #FFFFFF;
        --muted: #CCCCCC;
    }
}

/* Print styles */
@media print {
    .header,
    .footer,
    .btn {
        display: none;
    }
    
    body {
        color: black;
        background: white;
    }
    
    a {
        color: black;
        text-decoration: underline;
    }
}