/* CSS Reset and Variables */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --primary-color: #25D366;
    --primary-dark: #1ebe5e;
    --primary-light: #dcf8c6;
    --secondary-color: #128C7E;
    --accent-color: #075E54;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --text-light: #bdc3c7;
    --white: #ffffff;
    --gray-50: #f8f9fa;
    --gray-100: #f1f3f4;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-800: #343a40;
    --border-color: #e1e8ed;
    --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 10px 40px rgba(0, 0, 0, 0.2);
    
    /* Typography */
    --font-family: 'Inter', sans-serif;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Spacing */
    --container-max-width: 1200px;
    --section-padding: 8rem 0;
    --header-height: 90px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Border Radius */
    --border-radius: 8px;
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;
}

/* Base Styles */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--white);
}

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-semibold);
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: clamp(2.5rem, 4vw, 4rem);
    font-weight: var(--font-weight-bold);
}

h2 {
    font-size: clamp(2rem, 3vw, 3rem);
}

h3 {
    font-size: clamp(1.5rem, 2.5vw, 2rem);
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-family: var(--font-family);
    font-weight: var(--font-weight-medium);
    font-size: 0.95rem;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
}

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

.btn--primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(37, 211, 102, 0.4);
}

.btn--outline {
    background-color: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn--outline:hover {
    background-color: var(--gray-50);
    border-color: var(--text-primary);
}

.btn--text {
    background-color: transparent;
    color: var(--text-secondary);
    padding: 0.5rem 0;
}

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

.btn--large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn--full {
    width: 100%;
    justify-content: center;
}

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

.btn--google:hover {
    background-color: var(--gray-50);
    border-color: var(--gray-300);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: all var(--transition-normal);
    background-color: transparent;
}

.header.scrolled,
.header:hover {
    background-color: var(--white);
    box-shadow: var(--shadow-light);
    backdrop-filter: blur(10px);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 3rem;
}

.nav__brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    text-decoration: none;
}

.nav__icon {
    font-size: 1.75rem;
    color: var(--primary-color);
}

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

.nav__link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast);
}

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

.nav__actions {
    display: flex;
    gap: 1rem;
}

.nav__toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-primary);
}

/* Hero Section */
.hero {
    padding: calc(var(--header-height) + 4rem) 0 6rem;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #f8fffe 0%, #ffffff 100%);
}

.hero__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    width: 100%;
    position: relative;
    z-index: 2;
}

.hero__content {
    max-width: 600px;
    padding-right: 2rem;
}

.hero__title {
    margin-bottom: 1.5rem;
    line-height: 1.2;
    font-size: clamp(2.8rem, 5vw, 4.2rem);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
}

.hero__title--accent {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.hero__title--accent::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 60%;
    height: 4px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
    opacity: 0.6;
}

.hero__description {
    font-size: 1.2rem;
    margin-bottom: 2.5rem;
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 500px;
}

.hero__actions {
    display: flex;
    gap: 1.25rem;
    margin-bottom: 3rem;
    align-items: center;
}

/* Chat Mockup */
.hero__mockup {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.chat-mockup {
    background: var(--white);
    border-radius: var(--border-radius-xl);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    width: 100%;
    max-width: 380px;
    animation: float 6s ease-in-out infinite;
    border: 1px solid rgba(37, 211, 102, 0.2);
    position: relative;
    z-index: 3;
}

.chat-mockup::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--border-radius-xl);
    z-index: -1;
    opacity: 0.1;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.chat-header {
    background: var(--primary-color);
    color: var(--white);
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.chat-avatar {
    width: 40px;
    height: 40px;
    background: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
}

.chat-info h4 {
    margin: 0;
    font-size: 1rem;
}

.chat-info span {
    font-size: 0.875rem;
    opacity: 0.9;
}

.chat-messages {
    padding: 1.5rem;
    background: #f7f7f7;
    min-height: 220px;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="60" height="60" viewBox="0 0 60 60"><g fill="%23ffffff" fill-opacity="0.1"><circle cx="30" cy="30" r="2"/></g></svg>');
}

.message {
    margin-bottom: 1rem;
    max-width: 80%;
}

.message p {
    background: var(--white);
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius);
    margin: 0;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.message--received {
    margin-right: auto;
}

.message--sent {
    margin-left: auto;
}

.message--sent p {
    background: var(--primary-light);
    color: var(--text-primary);
}

/* Stats Section */
.stats {
    padding: 4rem 0;
    background: var(--white);
    border-top: 1px solid var(--gray-200);
}

.stats__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    text-align: center;
}

.stat-item {
    padding: 1.5rem;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
}

/* Features Section */
.features {
    padding: 8rem 0;
    background: var(--gray-50);
}

.section-header {
    text-align: center;
    margin-bottom: 6rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-title {
    margin-bottom: 1.5rem;
    font-size: clamp(2.5rem, 4vw, 3.5rem);
}

.section-subtitle {
    font-size: 1.3rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.features__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 3rem;
    max-width: 1400px;
    margin: 0 auto;
}

.feature-card {
    background: var(--white);
    padding: 3rem 2.5rem;
    border-radius: var(--border-radius-xl);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-15px);
    box-shadow: var(--shadow-heavy);
}

.feature-card:hover::before {
    transform: translateX(0);
}

.feature-card__icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.feature-card__title {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.feature-card__description {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

.feature-card__list {
    list-style: none;
    text-align: left;
}

.feature-card__list li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.5rem;
}

.feature-card__list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: var(--font-weight-bold);
}

/* How it Works Section */
.how-it-works {
    padding: 8rem 0;
    background: var(--white);
}

.steps {
    max-width: 1000px;
    margin: 0 auto;
}

.step {
    display: flex;
    align-items: center;
    gap: 4rem;
    margin-bottom: 4rem;
    padding: 3rem;
    background: var(--gray-50);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-light);
    transition: all var(--transition-normal);
}

.step:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.step:nth-child(even) {
    flex-direction: row-reverse;
}

.step__number {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    flex-shrink: 0;
    box-shadow: var(--shadow-medium);
}

.step__content {
    flex: 1;
}

.step__content h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-size: 1.5rem;
}

.step__content p {
    color: var(--text-secondary);
    margin: 0;
    font-size: 1.1rem;
    line-height: 1.6;
}

/* Pricing Section */
.pricing {
    padding: 8rem 0;
    background: var(--gray-50);
}

.pricing__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--white);
    border-radius: var(--border-radius-xl);
    padding: 3rem 2.5rem;
    text-align: center;
    border: 2px solid var(--border-color);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.pricing-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-heavy);
    border-color: var(--primary-color);
}

.pricing-card--featured {
    border-color: var(--primary-color);
    transform: scale(1.05);
    box-shadow: var(--shadow-medium);
}

.pricing-card--featured:hover {
    transform: scale(1.05) translateY(-10px);
}

.pricing-card__badge {
    position: absolute;
    top: 1.5rem;
    right: -2.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 0.5rem 3rem;
    font-size: 0.875rem;
    font-weight: var(--font-weight-bold);
    transform: rotate(45deg);
}

.pricing-card__header {
    margin-bottom: 2.5rem;
}

.pricing-card__header h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    margin-bottom: 1rem;
}

.currency {
    font-size: 1.5rem;
    color: var(--text-secondary);
}

.amount {
    font-size: 4rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin: 0 0.25rem;
}

.period {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

.pricing-card__description {
    color: var(--text-secondary);
    font-size: 1rem;
    margin: 0;
}

.pricing-card__features {
    list-style: none;
    margin-bottom: 2.5rem;
    text-align: left;
}

.pricing-card__features li {
    padding: 0.75rem 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 2rem;
    border-bottom: 1px solid var(--gray-200);
}

.pricing-card__features li:last-child {
    border-bottom: none;
}

.pricing-card__features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: var(--font-weight-bold);
    font-size: 1.1rem;
}

/* CTA Section */
.cta {
    padding: 8rem 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    text-align: center;
}

.cta__title {
    color: var(--white);
    margin-bottom: 1rem;
}

.cta__description {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    color: rgba(255, 255, 255, 0.9);
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: var(--white);
    padding: 3rem 0 1rem;
}

.footer__content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer__brand p {
    color: var(--text-light);
    margin-top: 1rem;
}

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

.footer__column h4 {
    margin-bottom: 1rem;
    color: var(--white);
}

.footer__column ul {
    list-style: none;
}

.footer__column li {
    margin-bottom: 0.5rem;
}

.footer__column a {
    color: var(--text-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.footer__bottom {
    border-top: 1px solid var(--gray-800);
    padding-top: 1rem;
    text-align: center;
    color: var(--text-light);
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal__overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
}

.modal__container {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    max-width: 400px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    z-index: 1;
    transform: scale(0.7);
    transition: transform var(--transition-normal);
}

.modal.active .modal__container {
    transform: scale(1);
}

.modal__header {
    padding: 2rem 2rem 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal__title {
    margin: 0;
    color: var(--text-primary);
}

.modal__close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

.modal__body {
    padding: 2rem;
}

/* Form Styles */
.auth-form {
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
}

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-family: var(--font-family);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.auth-divider {
    text-align: center;
    margin: 1.5rem 0;
    position: relative;
    color: var(--text-secondary);
}

.auth-divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--border-color);
    z-index: 1;
}

.auth-divider span {
    background: var(--white);
    padding: 0 1rem;
    position: relative;
    z-index: 2;
}

.auth-switch {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-secondary);
}

.auth-switch a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
}

.auth-switch a:hover {
    text-decoration: underline;
}

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

[data-aos="fade-up"] {
    animation: fadeInUp 0.8s ease-out;
}

[data-aos="fade-up"][data-aos-delay="100"] {
    animation-delay: 0.1s;
}

[data-aos="fade-up"][data-aos-delay="200"] {
    animation-delay: 0.2s;
}

[data-aos="fade-right"] {
    animation: fadeInRight 0.8s ease-out;
}

[data-aos="fade-left"] {
    animation: fadeInLeft 0.8s ease-out;
}

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

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

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .nav {
        padding: 0 1.5rem;
    }
    
    .nav__menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        box-shadow: var(--shadow-medium);
        padding: 2rem;
        z-index: 100;
    }
    
    .nav__menu.active {
        display: block;
    }
    
    .nav__list {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .nav__toggle {
        display: block;
    }
    
    .nav__actions {
        gap: 0.5rem;
    }
    
    .nav__actions .btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
    
    .hero {
        padding: calc(var(--header-height) + 2rem) 0 4rem;
    }
    
    .hero__container {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    
    .hero__content {
        padding-right: 0;
        max-width: 100%;
    }
    

    
    .hero__title {
        font-size: clamp(2.2rem, 8vw, 3.2rem);
    }
    
    .hero__description {
        max-width: 100%;
        font-size: 1.1rem;
    }
    
    .hero__actions {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
        justify-content: center;
    }
    
    .stats {
        padding: 3rem 0;
    }
    
    .stats__grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }
    
    .features__grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .step {
        flex-direction: column !important;
        text-align: center;
        gap: 2rem;
        padding: 2rem;
    }
    
    .pricing__grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .pricing-card--featured {
        transform: none;
        order: -1;
    }
    
    .pricing-card--featured:hover {
        transform: translateY(-10px);
    }
    
    .footer__content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
    
    .footer__links {
        grid-template-columns: repeat(3, 1fr);
        gap: 1.5rem;
    }
    
    .modal__container {
        width: 95%;
        margin: 1rem;
    }
    
    .modal__header,
    .modal__body {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 0.5rem;
    }
    
    .nav {
        padding: 0 1rem;
    }
    
    .hero {
        padding: calc(var(--header-height) + 2rem) 0 4rem;
    }
    
    .btn--large {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
    }
    
    .chat-mockup {
        max-width: 300px;
    }
    
    .feature-card {
        padding: 2rem 1.5rem;
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.mb-0 {
    margin-bottom: 0;
}

.mb-1 {
    margin-bottom: 1rem;
}

.mb-2 {
    margin-bottom: 2rem;
}

.mt-0 {
    margin-top: 0;
}

.mt-1 {
    margin-top: 1rem;
}

.mt-2 {
    margin-top: 2rem;
}

.d-none {
    display: none;
}

.d-block {
    display: block;
}

.d-flex {
    display: flex;
}

.justify-center {
    justify-content: center;
}

.align-center {
    align-items: center;
}