/* ===== ROOT & VARIABLES ===== */
:root {
    /* Primary Colors */
    --color-primary: #0066cc;
    --color-primary-dark: #0052a3;
    --color-primary-light: #e6f0ff;
    --color-primary-muted: #4d94ff;

    /* Neutral Colors */
    --color-bg: #fafafa;
    --color-bg-secondary: #ffffff;
    --color-text: #1a1a1a;
    --color-text-secondary: #666666;
    --color-text-tertiary: #999999;
    --color-border: #e0e0e0;
    --color-border-dark: #cccccc;
    --color-white: #ffffff;

    /* Semantic Colors */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-info: #0066cc;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;

    /* Spacing Scale (Modular 1.5x) */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Shadows (Depth System) */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.15);

    /* Transitions */
    --transition-fast: 200ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;

    /* Focus State */
    --focus-color: #0066cc;
    --focus-width: 3px;
    --focus-shadow: 0 0 0 var(--focus-width) rgba(0, 102, 204, 0.25);
}

/* ===== RESET & BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

/* Respect user motion preferences */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    font-size: 16px;
}

/* Enhanced focus visibility */
:focus-visible {
    outline: var(--focus-width) solid var(--focus-color);
    outline-offset: 2px;
}

/* Remove default focus outline and use custom */
:focus {
    outline: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 3rem;
}

h2 {
    font-size: 2.25rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* ===== LANG TOGGLE ===== */
.lang-toggle {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 999;
    display: flex;
    gap: var(--spacing-xs);
    background: var(--color-bg-secondary);
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

.lang-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    border: none;
    background: transparent;
    color: var(--color-text-secondary);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
    min-width: 44px;
    min-height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lang-btn.active {
    background: var(--color-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-sm);
}

.lang-btn:hover:not(.active) {
    background: var(--color-border);
    color: var(--color-text);
}

.lang-btn:focus-visible {
    outline: var(--focus-width) solid var(--focus-color);
    outline-offset: 0;
}

/* ===== NAVBAR ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    transition: box-shadow var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: var(--shadow-sm);
}

.navbar .container {
    padding: var(--spacing-md) var(--spacing-lg);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
}

.logo {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: 1px;
    white-space: nowrap;
    transition: color var(--transition-normal);
}

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

.logo:focus-visible {
    outline: var(--focus-width) solid var(--focus-color);
    outline-offset: 4px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    color: var(--color-text-secondary);
    font-weight: 500;
    transition: color var(--transition-normal);
    position: relative;
    padding-bottom: 4px;
    border-bottom: 2px solid transparent;
}

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

.nav-link.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

.nav-link:focus-visible {
    outline: var(--focus-width) solid var(--focus-color);
    outline-offset: 4px;
}

.btn-nav {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--color-primary);
    color: var(--color-white);
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.875rem;
    transition: all var(--transition-normal);
    cursor: pointer;
    min-height: 36px;
}

.btn-nav:hover {
    background: var(--color-primary-dark);
    box-shadow: var(--shadow-sm);
}

.btn-nav:focus-visible {
    box-shadow: var(--focus-shadow);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(8px, -8px);
}

/* ===== BUTTONS ===== */
.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    min-height: 44px;
    min-width: 44px;
    position: relative;
    user-select: none;
}

/* Primary Button */
.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.2);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-primary:focus-visible {
    box-shadow: var(--shadow-md), var(--focus-shadow);
}

/* Secondary Button */
.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border: 1.5px solid var(--color-primary);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-primary-light);
    border-color: var(--color-primary-dark);
}

.btn-secondary:active:not(:disabled) {
    background: var(--color-primary);
    color: var(--color-white);
}

.btn-secondary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-secondary:focus-visible {
    box-shadow: var(--focus-shadow);
}

/* Block Button */
.btn-block {
    width: 100%;
}

/* ===== HERO ===== */
.hero {
    padding: var(--spacing-3xl) var(--spacing-lg);
    text-align: center;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-lg);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-2xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

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

/* ===== STATS BAR ===== */
.stats-bar {
    background: var(--color-white);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-2xl) var(--spacing-lg);
    margin: var(--spacing-2xl) 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-2xl);
    text-align: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    transition: transform var(--transition-normal);
}

@media (prefers-reduced-motion: no-preference) {
    .stats-bar:hover .stat-number {
        transform: scale(1.05);
    }
}

.stat-text {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* ===== SERVICES ===== */
.services {
    padding: var(--spacing-3xl) var(--spacing-lg);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--color-text-light);
}

.services-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-2xl);
}

.service-box {
    background: var(--color-bg-secondary);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
    position: relative;
}

.service-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--color-primary);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.service-box:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--color-primary-light);
}

.service-box:hover::before {
    opacity: 1;
}

.service-header {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.service-icon {
    width: 48px;
    height: 48px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
    transition: all var(--transition-normal);
}

.service-box:hover .service-icon {
    background: var(--color-primary-dark);
    transform: scale(1.1);
}

.service-header h3 {
    margin: 0;
}

.service-description {
    font-size: 0.95rem;
    margin-bottom: var(--spacing-lg);
}

.service-features,
.service-use-cases {
    margin-bottom: var(--spacing-lg);
}

.service-features h4,
.service-use-cases h4 {
    font-size: 0.95rem;
    margin-bottom: var(--spacing-sm);
}

.service-features ul {
    list-style: none;
}

.service-features li {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--color-text-light);
}

.service-features i {
    color: var(--color-success);
    flex-shrink: 0;
}

.use-case-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.use-case-tags span {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--color-border);
    color: var(--color-text-light);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
}

/* ===== COMPARISON TABLE ===== */
.comparison {
    padding: var(--spacing-3xl) var(--spacing-lg);
    background: var(--color-white);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    margin: var(--spacing-3xl) 0;
}

.comparison .section-title {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.comparison-table {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

th, td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

th {
    background: var(--color-primary);
    color: var(--color-white);
    font-weight: 600;
    padding-top: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
}

tr:last-child td {
    border-bottom: none;
}

td:first-child {
    font-weight: 500;
    color: var(--color-text);
}

.table-title {
    font-weight: 600;
}

.check-icon {
    color: var(--color-success);
    font-size: 1.2rem;
}

/* ===== PROCESS STEPS ===== */
.how-it-works {
    padding: var(--spacing-3xl) var(--spacing-lg);
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-2xl);
}

.step {
    text-align: center;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: 50%;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

.step h3 {
    margin-bottom: var(--spacing-md);
}

.step p {
    font-size: 0.95rem;
}

/* ===== WHY US ===== */
.why-us {
    padding: var(--spacing-3xl) var(--spacing-lg);
    background: var(--color-white);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    margin: var(--spacing-3xl) 0;
}

.why-us .section-title {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.reasons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-2xl);
}

.reason-card {
    text-align: center;
    padding: var(--spacing-lg);
}

.reason-card i {
    font-size: 2.5rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    display: block;
    transition: all var(--transition-normal);
}

.reason-card:hover i {
    transform: scale(1.1) rotate(5deg);
    color: var(--color-primary-dark);
}

.reason-card h3 {
    margin-bottom: var(--spacing-md);
}

.reason-card p {
    font-size: 0.95rem;
}

/* ===== CONTACT CTA ===== */
.contact-cta {
    padding: var(--spacing-3xl) var(--spacing-lg);
    text-align: center;
    background: var(--color-primary);
    color: var(--color-white);
}

.contact-cta h2 {
    font-size: 2.25rem;
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.contact-cta p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.contact-methods {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;
}

.contact-method {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--color-white);
    font-weight: 500;
    transition: all 0.3s ease;
}

.contact-method:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* ===== CONTACT FORM ===== */
.contact-section {
    padding: var(--spacing-3xl) var(--spacing-lg);
}

.contact-section .section-title {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

.contact-info h3 {
    margin-bottom: var(--spacing-lg);
}

.info-item {
    margin-bottom: var(--spacing-lg);
}

.info-item strong {
    display: block;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.info-item p {
    color: var(--color-text-light);
    margin-bottom: 0;
}

.info-item a {
    color: var(--color-primary);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

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

.contact-form input,
.contact-form select,
.contact-form textarea {
    padding: var(--spacing-md);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 1rem;
    color: var(--color-text);
    background: var(--color-bg-secondary);
    transition: all var(--transition-normal);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
    color: var(--color-text-tertiary);
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

/* Invalid state */
.contact-form input:invalid:not(:placeholder-shown),
.contact-form textarea:invalid:not(:placeholder-shown) {
    border-color: var(--color-danger);
    background-color: rgba(239, 68, 68, 0.02);
}

.contact-form input:valid:not(:placeholder-shown),
.contact-form textarea:valid:not(:placeholder-shown) {
    border-color: var(--color-success);
}

/* ===== FOOTER ===== */
.footer {
    background: var(--color-text);
    color: var(--color-white);
    padding: var(--spacing-3xl) var(--spacing-lg) var(--spacing-lg);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-col h4 {
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.footer-col p,
.footer-col a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

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

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-bottom {
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    .lang-toggle {
        top: auto;
        bottom: var(--spacing-lg);
        right: var(--spacing-lg);
    }

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

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-white);
        flex-direction: column;
        gap: var(--spacing-lg);
        padding: var(--spacing-lg);
        border-bottom: 1px solid var(--color-border);
        display: none;
        width: 100%;
    }

    .nav-menu.active {
        display: flex;
    }

    .hamburger {
        display: flex;
    }

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

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

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }

    .stat-number {
        font-size: 1.5rem;
    }

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

    .services-container {
        grid-template-columns: 1fr;
    }

    .process-steps {
        grid-template-columns: 1fr;
    }

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

    .contact-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }

    .contact-methods {
        flex-direction: column;
    }

    .contact-method {
        width: 100%;
    }

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

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

    .section-header {
        margin-bottom: var(--spacing-2xl);
    }

    .hero {
        padding: var(--spacing-2xl) var(--spacing-lg);
    }

    .services,
    .how-it-works,
    .contact-section {
        padding: var(--spacing-2xl) var(--spacing-lg);
    }

    .stats-bar,
    .comparison,
    .why-us {
        margin: var(--spacing-2xl) 0;
        padding: var(--spacing-2xl) var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.5rem;
    }

    h2 {
        font-size: 1.25rem;
    }

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

    .hero-subtitle {
        font-size: 0.95rem;
    }

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

    .service-box {
        padding: var(--spacing-lg);
    }

    table {
        font-size: 0.85rem;
    }

    th, td {
        padding: var(--spacing-sm);
    }

    .lang-toggle {
        bottom: var(--spacing-sm);
        right: var(--spacing-sm);
        padding: 0.25rem;
    }

    .lang-btn {
        padding: 0.25rem var(--spacing-sm);
        font-size: 0.75rem;
    }
}