/* ===== CSS Variables ===== */
:root {
    --primary-600: #4f46e5;
    --primary-500: #6366f1;
    --primary-400: #818cf8;
    --primary-100: #e0e7ff;
    --primary-50: #eef2ff;

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

    --white: #ffffff;
    --success: #10b981;
    --warning: #f59e0b;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --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);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    --radius-sm: 6px;
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;

    --transition: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--gray-700);
    background: var(--white);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    color: var(--gray-900);
    font-weight: 700;
    line-height: 1.25;
}

a {
    color: var(--primary-600);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--primary-500);
}

/* ===== Layout ===== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

@media (max-width: 640px) {
    .container {
        padding: 0 16px;
    }
}

/* ===== Header ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--gray-200);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--gray-900);
    letter-spacing: -0.025em;
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-400) 100%);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-weight: 800;
    font-size: 1.125rem;
}

.nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav a {
    color: var(--gray-600);
    font-size: 0.9375rem;
    font-weight: 500;
    transition: color var(--transition);
}

.nav a:hover {
    color: var(--gray-900);
}

.nav a.active {
    color: var(--primary-600);
}

/* Mobile menu */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
    color: var(--gray-700);
}

@media (max-width: 768px) {
    .nav {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 16px 24px;
        gap: 16px;
        border-bottom: 1px solid var(--gray-200);
        box-shadow: var(--shadow-lg);
    }

    .nav.open {
        display: flex;
    }

    .menu-toggle {
        display: block;
    }
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    padding: 80px 0 100px;
    background: linear-gradient(180deg, var(--primary-50) 0%, var(--white) 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--primary-100) 0%, transparent 70%);
    opacity: 0.6;
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--primary-100) 0%, transparent 70%);
    opacity: 0.4;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}

.hero-badge-dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--gray-900) 0%, var(--gray-700) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-tagline {
    font-size: 1.375rem;
    color: var(--gray-600);
    margin-bottom: 16px;
    font-weight: 500;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--gray-500);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    background: var(--primary-600);
    color: var(--white);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md), 0 0 0 0 rgba(79, 70, 229, 0.3);
    transition: all var(--transition);
}

.hero-cta:hover {
    background: var(--primary-500);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 0 4px rgba(79, 70, 229, 0.15);
}

.hero-cta svg {
    width: 20px;
    height: 20px;
    transition: transform var(--transition);
}

.hero-cta:hover svg {
    transform: translateX(4px);
}

@media (max-width: 768px) {
    .hero {
        padding: 60px 0 80px;
    }

    .hero h1 {
        font-size: 2.25rem;
    }

    .hero-tagline {
        font-size: 1.125rem;
    }

    .hero-description {
        font-size: 1rem;
    }
}

/* ===== Problems Section ===== */
.problems {
    padding: 80px 0;
    background: var(--white);
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 56px;
}

.section-label {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-600);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
}

.section-title {
    font-size: 2.25rem;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--gray-500);
}

.problems-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}

.problem-card {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 24px;
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-100);
    transition: all var(--transition);
}

.problem-card:hover {
    background: var(--white);
    border-color: var(--gray-200);
    box-shadow: var(--shadow-md);
}

.problem-icon {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--warning);
}

.problem-content h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 4px;
}

.problem-content p {
    font-size: 0.9375rem;
    color: var(--gray-500);
    line-height: 1.5;
}

@media (max-width: 768px) {
    .problems {
        padding: 60px 0;
    }

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

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

/* ===== Features Section ===== */
.features {
    padding: 80px 0;
    background: linear-gradient(180deg, var(--gray-50) 0%, var(--white) 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    position: relative;
    padding: 32px 24px;
    background: var(--white);
    border-radius: var(--radius-xl);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-slow);
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-600), var(--primary-400));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-slow);
}

.feature-card:hover {
    border-color: var(--primary-200, #c7d2fe);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

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

.feature-icon {
    width: 52px;
    height: 52px;
    background: var(--primary-50);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--primary-600);
    transition: all var(--transition);
}

.feature-card:hover .feature-icon {
    background: var(--primary-600);
    color: var(--white);
}

.feature-card h3 {
    font-size: 1.0625rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 0.9375rem;
    color: var(--gray-500);
    line-height: 1.6;
}

@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .features {
        padding: 60px 0;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .feature-card {
        padding: 24px 20px;
    }
}

/* ===== Periods Section ===== */
.periods {
    padding: 80px 0;
    background: var(--white);
}

.periods-wrapper {
    text-align: center;
}

.periods-list {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 40px;
}

.period-badge {
    padding: 12px 24px;
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-2xl);
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--gray-700);
    transition: all var(--transition);
    cursor: default;
}

.period-badge:hover {
    border-color: var(--primary-400);
    background: var(--primary-50);
    color: var(--primary-600);
}

@media (max-width: 640px) {
    .periods {
        padding: 60px 0;
    }

    .periods-list {
        gap: 8px;
    }

    .period-badge {
        padding: 10px 18px;
        font-size: 0.875rem;
    }
}

/* ===== Benefits Section ===== */
.benefits {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-600) 0%, #7c3aed 100%);
    color: var(--white);
}

.benefits .section-label {
    color: var(--primary-200, #c7d2fe);
}

.benefits .section-title {
    color: var(--white);
}

.benefits .section-subtitle {
    color: rgba(255, 255, 255, 0.8);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 48px;
}

.benefit-item {
    text-align: center;
}

.benefit-icon {
    width: 64px;
    height: 64px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    backdrop-filter: blur(8px);
}

.benefit-item h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 8px;
}

.benefit-item p {
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

@media (max-width: 768px) {
    .benefits {
        padding: 60px 0;
    }

    .benefits-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

/* ===== Audience Section ===== */
.audience {
    padding: 80px 0;
    background: var(--gray-50);
}

.audience-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 48px;
}

.audience-card {
    padding: 32px;
    background: var(--white);
    border-radius: var(--radius-xl);
    border: 1px solid var(--gray-200);
    text-align: center;
    transition: all var(--transition);
}

.audience-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.audience-emoji {
    font-size: 3rem;
    margin-bottom: 16px;
}

.audience-card h3 {
    font-size: 1.125rem;
    margin-bottom: 8px;
}

.audience-card p {
    font-size: 0.9375rem;
    color: var(--gray-500);
}

@media (max-width: 768px) {
    .audience {
        padding: 60px 0;
    }

    .audience-cards {
        grid-template-columns: 1fr;
        gap: 16px;
    }
}

/* ===== Mobile Badge ===== */
.mobile-optimized {
    padding: 60px 0;
    background: var(--white);
    text-align: center;
}

.mobile-badge {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 16px 32px;
    background: linear-gradient(135deg, var(--gray-900) 0%, var(--gray-800) 100%);
    color: var(--white);
    border-radius: var(--radius-2xl);
    font-size: 1rem;
    font-weight: 600;
    box-shadow: var(--shadow-xl);
}

.mobile-badge svg {
    width: 24px;
    height: 24px;
}

/* ===== Legal Pages ===== */
.legal-hero {
    padding: 60px 0;
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
}

.legal-hero h1 {
    font-size: 2.5rem;
    text-align: center;
}

.legal-content {
    padding: 60px 0;
    max-width: 800px;
    margin: 0 auto;
}

.legal-content h2 {
    font-size: 1.375rem;
    margin-top: 48px;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary-100);
}

.legal-content h2:first-of-type {
    margin-top: 0;
}

.legal-content p {
    margin-bottom: 16px;
    color: var(--gray-700);
    line-height: 1.8;
}

.legal-content ul {
    margin-bottom: 16px;
    padding-left: 24px;
}

.legal-content li {
    margin-bottom: 8px;
    color: var(--gray-700);
    line-height: 1.7;
}

.legal-content strong {
    color: var(--gray-800);
}

.legal-content a {
    color: var(--primary-600);
    text-decoration: underline;
    text-underline-offset: 2px;
}

@media (max-width: 768px) {
    .legal-hero {
        padding: 40px 0;
    }

    .legal-hero h1 {
        font-size: 1.75rem;
    }

    .legal-content {
        padding: 40px 0;
    }

    .legal-content h2 {
        font-size: 1.25rem;
        margin-top: 32px;
    }
}

/* ===== Contacts Page ===== */
.contacts-hero {
    padding: 80px 0;
    background: linear-gradient(180deg, var(--primary-50) 0%, var(--white) 100%);
}

.contacts-content {
    text-align: center;
}

.contacts-content h1 {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.contacts-content .subtitle {
    font-size: 1.125rem;
    color: var(--gray-500);
    margin-bottom: 48px;
}

.contact-cards {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

.contact-card {
    padding: 40px;
    background: var(--white);
    border-radius: var(--radius-xl);
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-md);
    min-width: 280px;
    transition: all var(--transition);
}

.contact-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-4px);
}

.contact-icon {
    width: 56px;
    height: 56px;
    background: var(--primary-50);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: var(--primary-600);
}

.contact-card h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
}

.contact-card p {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
}

.contact-card a {
    color: var(--primary-600);
    font-weight: 600;
}

.contact-card a:hover {
    text-decoration: underline;
}

@media (max-width: 640px) {
    .contacts-hero {
        padding: 60px 0;
    }

    .contacts-content h1 {
        font-size: 2rem;
    }

    .contact-cards {
        flex-direction: column;
        align-items: center;
    }

    .contact-card {
        width: 100%;
        max-width: 320px;
    }
}

/* ===== Footer ===== */
.footer {
    padding: 48px 0 32px;
    background: var(--gray-900);
    color: var(--gray-400);
    margin-top: auto;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 24px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-brand .logo-icon {
    width: 32px;
    height: 32px;
    font-size: 1rem;
}

.footer-brand span {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--white);
}

.footer-links {
    display: flex;
    gap: 32px;
}

.footer-links a {
    color: var(--gray-400);
    font-size: 0.9375rem;
    transition: color var(--transition);
}

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

.footer-bottom {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--gray-800);
    text-align: center;
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    .footer {
        padding: 40px 0 24px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 16px 24px;
    }
}

/* ===== 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-width: 0;
}

/* ===== Nav Dropdown ===== */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-toggle {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--gray-600);
    font-family: inherit;
    font-size: 0.9375rem;
    font-weight: 500;
    padding: 0;
    transition: color var(--transition);
}

.nav-dropdown-toggle:hover {
    color: var(--gray-900);
}

.nav-dropdown-toggle svg {
    width: 16px;
    height: 16px;
    transition: transform var(--transition);
}

.nav-dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    min-width: 320px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 8px;
    padding-top: 16px;
    z-index: 200;
}

.nav-dropdown-menu::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 0;
    right: 0;
    height: 8px;
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu {
    display: block;
}

.nav-dropdown:hover .nav-dropdown-toggle svg,
.nav-dropdown:focus-within .nav-dropdown-toggle svg {
    transform: rotate(180deg);
}

.nav-dropdown-menu a {
    display: block;
    padding: 10px 14px;
    border-radius: var(--radius);
    font-size: 0.9375rem;
    color: var(--gray-700);
    transition: background var(--transition), color var(--transition);
}

.nav-dropdown-menu a:hover {
    background: var(--primary-50);
    color: var(--primary-600);
}

@media (max-width: 768px) {
    .nav-dropdown {
        width: 100%;
    }

    .nav-dropdown-menu {
        position: static;
        transform: none;
        box-shadow: none;
        border: none;
        padding: 0 0 0 16px;
        min-width: 0;
    }

    .nav.open .nav-dropdown .nav-dropdown-menu {
        display: block;
    }
}

/* ===== Products Section (Home Page) ===== */
.products {
    padding: 80px 0;
    background: var(--white);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.product-card {
    padding: 32px;
    background: var(--white);
    border-radius: var(--radius-xl);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-slow);
}

.product-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.product-card-icon {
    width: 52px;
    height: 52px;
    background: var(--primary-50);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--primary-600);
}

.product-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.product-card p {
    font-size: 0.9375rem;
    color: var(--gray-500);
    line-height: 1.6;
    margin-bottom: 16px;
}

.product-card-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--primary-600);
}

.product-card-link:hover {
    color: var(--primary-500);
}

@media (max-width: 640px) {
    .products {
        padding: 60px 0;
    }

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

/* ===== Animations ===== */
@media (prefers-reduced-motion: no-preference) {
    .feature-card,
    .problem-card,
    .audience-card,
    .contact-card,
    .period-badge,
    .product-card {
        transition: all var(--transition-slow);
    }
}