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

:root {
    --black: #000000;
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--white);
    overflow-x: hidden;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--gray-200);
    z-index: 1000;
    transition: var(--transition);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--black);
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    text-transform: uppercase;
}

.logo-plus,
.brand-plus {
    font-weight: 800;
    font-size: 1.2em;
    margin-left: 0.05em;
    vertical-align: baseline;
}

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

.nav-menu a {
    text-decoration: none;
    color: var(--gray-700);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-menu a:hover {
    color: var(--black);
}

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

.nav-menu a:hover::after {
    width: 100%;
}

.cta-button {
    background-color: var(--black) !important;
    color: var(--white) !important;
    padding: 0.75rem 1.5rem !important;
    border-radius: 0.5rem;
    font-weight: 600;
    border: 2px solid var(--black);
}

.cta-button:hover {
    background-color: var(--white) !important;
    color: var(--black) !important;
}

.cta-button::after {
    display: none;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background-color: var(--black);
    transition: var(--transition);
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--white) 0%, var(--gray-50) 70%, var(--gray-100) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 20% 50%, var(--gray-100) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, var(--gray-100) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, var(--gray-100) 0%, transparent 50%);
    opacity: 0.4;
}

.hero::after {
    content: '';
    position: absolute;
    top: 0;
    right: -10%;
    width: 600px;
    height: 100%;
    background: repeating-linear-gradient(
        90deg,
        transparent 0px,
        transparent 8px,
        var(--gray-200) 8px,
        var(--gray-200) 12px,
        transparent 12px,
        transparent 20px,
        var(--gray-300) 20px,
        var(--gray-300) 24px,
        transparent 24px,
        transparent 32px,
        var(--gray-400) 32px,
        var(--gray-400) 36px,
        transparent 36px,
        transparent 44px,
        var(--gray-500) 44px,
        var(--gray-500) 48px
    );
    opacity: 0.3;
    transform: skewX(-15deg);
    animation: gradientShift 20s ease-in-out infinite;
}

@keyframes gradientShift {
    0%, 100% {
        transform: skewX(-15deg) translateX(0);
        opacity: 0.3;
    }
    50% {
        transform: skewX(-15deg) translateX(-50px);
        opacity: 0.2;
    }
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    text-align: center;
    position: relative;
    z-index: 2;
}

.hero-content {
    margin-bottom: 4rem;
}

.hero-logo {
    margin-bottom: 3rem;
}

.brand-name {
    font-size: 4.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--black);
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    margin-top: 2rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.brand-tagline {
    font-size: 1.25rem;
    color: var(--gray-600);
    font-weight: 400;
    max-width: 600px;
    margin: 0 auto;
}

.hero-main {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 4.2rem;
    font-weight: 800;
    line-height: 1.1;
    color: var(--black);
    margin-bottom: 2rem;
    letter-spacing: -0.025em;
    position: relative;
    z-index: 2;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.hero-description {
    font-size: 1.25rem;
    color: var(--gray-600);
    line-height: 1.6;
    margin-bottom: 3rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

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

.primary-button {
    background-color: var(--black);
    color: var(--white);
    padding: 1rem 2rem;
    border-radius: 0.75rem;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: var(--transition);
    border: 2px solid var(--black);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.primary-button:hover {
    background-color: var(--white);
    color: var(--black);
    transform: translateY(-2px);
}

.secondary-button {
    background-color: transparent;
    color: var(--gray-700);
    padding: 1rem 2rem;
    border-radius: 0.75rem;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: var(--transition);
    border: 2px solid var(--gray-300);
}

.secondary-button:hover {
    background-color: var(--gray-50);
    border-color: var(--gray-400);
    transform: translateY(-2px);
}

.scroll-indicator {
    position: absolute;
    bottom: 6rem;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
    z-index: 1;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-right: 2px solid var(--gray-400);
    border-bottom: 2px solid var(--gray-400);
    transform: rotate(45deg);
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

.chatbots {
    padding: 8rem 0;
    background-color: var(--white);
    position: relative;
}

.chatbots::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--gray-300) 50%, transparent 100%);
}

.chatbot-showcase {
    margin-top: 4rem;
}

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

.showcase-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--black);
    margin-bottom: 1.5rem;
}

.showcase-description {
    font-size: 1.125rem;
    color: var(--gray-600);
    line-height: 1.6;
    margin-bottom: 2.5rem;
}

.capability-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.capability-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    border: 1px solid var(--gray-200);
    border-radius: 0.75rem;
    background-color: var(--gray-50);
}

.capability-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
    margin-top: 0.25rem;
}

.capability-item h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--black);
    margin-bottom: 0.5rem;
}

.capability-item p {
    color: var(--gray-600);
    line-height: 1.5;
}

.chatbot-demo {
    background-color: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.demo-header {
    background-color: var(--gray-100);
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.demo-title {
    font-weight: 600;
    color: var(--gray-800);
}

.demo-status {
    color: var(--gray-600);
    font-size: 0.875rem;
}

.demo-conversation {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    min-height: 300px;
}

.demo-message {
    max-width: 80%;
    padding: 0.75rem 1rem;
    border-radius: 1rem;
    line-height: 1.4;
}

.demo-message.student {
    align-self: flex-end;
    background-color: var(--gray-900);
    color: var(--white);
    border-bottom-right-radius: 0.25rem;
}

.demo-message.bot {
    align-self: flex-start;
    background-color: var(--gray-100);
    color: var(--gray-800);
    border-bottom-left-radius: 0.25rem;
}

.demo-message p {
    margin: 0;
    font-size: 0.9rem;
}

.benefits {
    padding: 8rem 0;
    background-color: var(--gray-50);
    position: relative;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.benefit-card {
    background-color: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 1rem;
    padding: 2rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.benefit-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background-color: var(--gray-900);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

.benefit-card:hover::before {
    transform: scaleX(1);
}

.benefit-card:hover {
    border-color: var(--gray-300);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.benefit-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 1.5rem;
    background-color: var(--gray-100);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.benefit-icon svg {
    width: 24px;
    height: 24px;
    stroke: var(--gray-700);
}

.benefit-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--black);
    margin-bottom: 1rem;
}

.benefit-description {
    color: var(--gray-600);
    line-height: 1.6;
}

.credibility-features {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-top: 2rem;
}

.credibility-item h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 0.75rem;
}

.credibility-item p {
    color: var(--gray-300);
    line-height: 1.6;
}

.solutions {
    padding: 8rem 0;
    background-color: var(--white);
    position: relative;
}

.solutions::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--gray-300) 50%, transparent 100%);
}

.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section-header {
    text-align: center;
    margin-bottom: 5rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.section-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: var(--gray-100);
    color: var(--gray-700);
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    border: 1px solid var(--gray-200);
}

.section-title {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.2;
    color: var(--black);
    margin-bottom: 1.5rem;
    letter-spacing: -0.025em;
}

.section-description {
    font-size: 1.125rem;
    color: var(--gray-600);
    line-height: 1.6;
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.solution-card {
    background-color: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: 1rem;
    padding: 2.5rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.solution-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background-color: var(--gray-900);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

.solution-card:hover::before {
    transform: scaleX(1);
}

.solution-card:hover {
    border-color: var(--gray-400);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.solution-card.featured {
    border-color: var(--gray-900);
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
}

.solution-card.featured::before {
    transform: scaleX(1);
}

.card-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 1.5rem;
    background-color: var(--gray-100);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-icon svg {
    width: 24px;
    height: 24px;
    stroke: var(--gray-700);
}

.card-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--black);
    margin-bottom: 1rem;
}

.card-description {
    color: var(--gray-600);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.card-tags span {
    padding: 0.25rem 0.75rem;
    background-color: var(--gray-100);
    color: var(--gray-700);
    border-radius: 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid var(--gray-200);
}

.about {
    padding: 8rem 0;
    background: linear-gradient(135deg, var(--gray-900) 0%, var(--black) 100%);
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.about::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 20% 20%, rgba(255,255,255,0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255,255,255,0.1) 0%, transparent 50%);
}

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

.about .section-title {
    color: var(--white);
    margin-bottom: 2rem;
}

.about-description {
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--gray-300);
    margin-bottom: 3rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.stat-item {
    text-align: center;
    padding: 1.5rem;
    border: 1px solid var(--gray-700);
    border-radius: 0.75rem;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-400);
    font-weight: 500;
}

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

.visual-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    padding: 2rem;
}

.grid-item {
    width: 60px;
    height: 60px;
    background-color: var(--gray-800);
    border-radius: 0.5rem;
    transition: var(--transition);
    border: 1px solid var(--gray-700);
}

.grid-item.active {
    background-color: var(--white);
    transform: scale(1.1);
}

.contact {
    padding: 8rem 0;
    background-color: var(--gray-50);
    position: relative;
}

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

.contact .section-title {
    margin-bottom: 1.5rem;
}

.contact-description {
    font-size: 1.125rem;
    color: var(--gray-600);
    line-height: 1.6;
    margin-bottom: 2rem;
}

.contact-features {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 0;
}

.feature-item svg {
    width: 24px;
    height: 24px;
    stroke: var(--gray-600);
    flex-shrink: 0;
}

.contact-form {
    background-color: var(--white);
    padding: 2.5rem;
    border-radius: 1rem;
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
}

.form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 1rem;
    border: 2px solid var(--gray-200);
    border-radius: 0.5rem;
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
    background-color: var(--white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--gray-400);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.1);
}

.submit-button {
    background-color: var(--black);
    color: var(--white);
    padding: 1rem 2rem;
    border: none;
    border-radius: 0.75rem;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.submit-button:hover {
    background-color: var(--gray-800);
    transform: translateY(-2px);
}

.footer {
    background-color: var(--gray-900);
    color: var(--gray-300);
    padding: 4rem 0 2rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    margin-bottom: 2rem;
}

.footer-brand .logo {
    margin-bottom: 1rem;
}

.footer-brand .logo-text {
    color: var(--white);
}

.footer-brand p {
    color: var(--gray-400);
    line-height: 1.6;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.footer-column h4 {
    color: var(--white);
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-column a {
    display: block;
    color: var(--gray-400);
    text-decoration: none;
    margin-bottom: 0.5rem;
    transition: var(--transition);
}

.footer-column a:hover {
    color: var(--white);
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--gray-700);
    text-align: center;
    color: var(--gray-500);
}

.direct-contact {
    margin-top: 1.5rem;
    padding: 1.5rem;
    background-color: var(--gray-100);
    border-radius: 0.75rem;
    border: 1px solid var(--gray-200);
}

.direct-contact p {
    margin: 0.5rem 0;
    font-size: 0.95rem;
}

.direct-contact a {
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
}

.direct-contact a:hover {
    color: var(--black);
    text-decoration: underline;
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .brand-name {
        font-size: 2.5rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .showcase-content,
    .solutions-grid,
    .about-content,
    .contact-content,
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .benefits-grid {
        grid-template-columns: 1fr;
    }

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

    .primary-button,
    .secondary-button {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }

    .chatbot-demo {
        order: -1;
        margin-bottom: 2rem;
    }

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

@media (max-width: 480px) {
    .nav-container {
        padding: 1rem;
    }

    .section-container {
        padding: 0 1rem;
    }

    .solution-card,
    .contact-form {
        padding: 1.5rem;
    }

    .brand-name {
        font-size: 2rem;
    }

    .hero-title {
        font-size: 2rem;
    }
}

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}