/* ===========================
   CSS Variables & Base Styles
   =========================== */

:root {
    /* Colors */
    --primary-color: #1a73e8;
    --primary-dark: #1557b0;
    --primary-light: #4285f4;
    --secondary-color: #34a853;
    --accent-color: #ea4335;
    
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --text-light: #80868b;
    
    --bg-white: #ffffff;
    --bg-gray: #f8f9fa;
    --bg-dark: #202124;
    
    --border-color: #dadce0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
    
    /* Breakpoints (referenced in media queries) */
    --breakpoint-sm: 640px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;
    
    /* Container */
    --container-max-width: 1200px;
    --container-padding: 1.5rem;
    
    /* Header */
    --header-height: 70px;
}

/* ===========================
   Reset & Base Styles
   =========================== */

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

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--text-primary);
    background-color: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===========================
   Typography
   =========================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 2rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

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

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

/* ===========================
   Layout
   =========================== */

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

.section {
    padding: var(--spacing-3xl) 0;
}

.section--gray {
    background-color: var(--bg-gray);
}

.section__header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section__subtitle {
    display: inline-block;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-sm);
}

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

.section__description {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

/* ===========================
   Buttons
   =========================== */

.button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 500;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

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

.button--primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.button--secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

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

/* ===========================
   Header & Navigation
   =========================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--bg-white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-base);
}

.header.scroll-header {
    box-shadow: var(--shadow-md);
}

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

.nav__logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-text {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav__link {
    color: var(--text-primary);
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
    transition: color var(--transition-fast);
}

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

.nav__link:hover::after,
.nav__link.active-link::after {
    width: 100%;
}

.nav__link.active-link {
    color: var(--primary-color);
}

.nav__cta {
    background-color: var(--primary-color);
    color: var(--bg-white);
    padding: 0.5rem 1.25rem;
    border-radius: 6px;
}

.nav__cta::after {
    display: none;
}

.nav__cta:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

.nav__toggle,
.nav__close {
    display: none;
}

/* ===========================
   Skip Link (Accessibility)
   =========================== */

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    z-index: 9999;
}

.skip-link:focus {
    top: 0;
}

/* ===========================
   Hero Section
   =========================== */

.hero {
    padding-top: calc(var(--header-height) + var(--spacing-3xl));
    padding-bottom: var(--spacing-3xl);
    min-height: 90vh;
    display: flex;
    align-items: center;
}

.hero__container {
    display: block;
    max-width: 900px;
    margin: 0 auto;
    text-align: center;   
}

.hero__content {
    max-width: 800px;
}

.hero__title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
}

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

.hero__description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
}

.hero__buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.hero__image-placeholder {
    width: 100%;
    height: auto;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.hero__image-placeholder svg {
    width: 100%;
    height: auto;
    display: block;
}

/* ===========================
   About Section
   =========================== */

.about__content {
    display: grid;
    gap: var(--spacing-2xl);
}

.about__description {
    font-size: 1.125rem;
    line-height: 1.8;
}

.about__stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.stat__item {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--bg-white);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base);
}

.stat__item:hover {
    transform: translateY(-5px);
}

.stat__number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.stat__number::after {
    content: '%';
    font-size: 2rem;
}

.stat__label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ===========================
   Solutions Section
   =========================== */

.solutions__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.solution__card {
    background: var(--bg-white);
    padding: var(--spacing-xl);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.solution__card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.solution__icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.solution__icon svg {
    color: var(--bg-white);
}

.solution__title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.solution__description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===========================
   Advantage Section
   =========================== */

.advantage__content {
    display: grid;
    gap: var(--spacing-xl);
    max-width: 900px;
    margin: 0 auto;
}

.advantage__item {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    background: var(--bg-white);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.advantage__item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-lg);
}

.advantage__number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    opacity: 0.2;
    flex-shrink: 0;
}

.advantage__text {
    flex: 1;
}

.advantage__title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.advantage__description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===========================
   Contact Section
   =========================== */

.contact__content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-2xl);
}

.contact__info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.contact__info-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--bg-white);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
}

.contact__info-icon {
    width: 48px;
    height: 48px;
    background: var(--bg-gray);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact__info-icon svg {
    color: var(--primary-color);
}

.contact__info-item h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.contact__info-item p,
.contact__info-item a {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ===========================
   Contact Form
   =========================== */

.contact__form {
    background: var(--bg-white);
    padding: var(--spacing-xl);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

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

.form__group--full {
    grid-column: 1 / -1;
}

.form__label {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    font-size: 0.875rem;
}

.form__input,
.form__textarea {
    padding: 0.875rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-family: var(--font-family);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

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

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

.form__message {
    padding: var(--spacing-sm);
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
    display: none;
}

.form__message.success {
    display: block;
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.form__message.error {
    display: block;
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* ===========================
   Footer
   =========================== */

.footer {
    background-color: var(--bg-dark);
    color: var(--bg-white);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer__content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer__title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--bg-white);
}

.footer__description {
    color: var(--text-light);
    font-size: 0.875rem;
}

.footer__subtitle {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
    color: var(--bg-white);
}

.footer__links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer__links a {
    color: var(--text-light);
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

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

.footer__social {
    display: flex;
    gap: var(--spacing-sm);
}

.footer__social a {
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-fast);
}

.footer__social a:hover {
    background-color: var(--primary-color);
}

.footer__bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    color: var(--text-light);
    font-size: 0.875rem;
}

/* ===========================
   Scroll to Top Button
   =========================== */

.scroll-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    background-color: var(--primary-color);
    color: var(--bg-white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
}

.scroll-top.show {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    background-color: var(--primary-dark);
    transform: translateY(-4px);
}

/* ===========================
   Responsive Design
   =========================== */

@media screen and (max-width: 1024px) {
    :root {
        --spacing-3xl: 4rem;
    }
    
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    
    .hero__title {
        font-size: 2.5rem;
    }
    
    .hero__container {
        grid-template-columns: 1fr;
    }
    
    .hero__image {
        order: -1;
    }
    
    .contact__content {
        grid-template-columns: 1fr;
    }
}

@media screen and (max-width: 768px) {
    :root {
        --header-height: 60px;
        --spacing-3xl: 3rem;
        --spacing-2xl: 2.5rem;
    }
    
    .nav__menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background-color: var(--bg-white);
        box-shadow: var(--shadow-xl);
        padding: var(--spacing-2xl) var(--spacing-lg);
        transition: right var(--transition-slow);
    }
    
    .nav__menu.show-menu {
        right: 0;
    }
    
    .nav__list {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .nav__toggle,
    .nav__close {
        display: flex;
        cursor: pointer;
    }
    
    .nav__close {
        position: absolute;
        top: 1rem;
        right: 1rem;
    }
    
    .nav__cta {
        display: inline-block;
        text-align: center;
    }
    
    .hero {
        padding-top: calc(var(--header-height) + var(--spacing-xl));
    }
    
    .hero__title {
        font-size: 2rem;
    }
    
    .hero__description {
        font-size: 1rem;
    }
    
    .hero__buttons {
        flex-direction: column;
    }
    
    .hero__buttons .button {
        width: 100%;
        justify-content: center;
    }
    
    .about__stats {
        grid-template-columns: 1fr;
    }
    
    .solutions__grid {
        grid-template-columns: 1fr;
    }
    
    .advantage__item {
        flex-direction: column;
        text-align: center;
    }
    
    .contact__form {
        grid-template-columns: 1fr;
        padding: var(--spacing-lg);
    }
    
    .footer__content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer__social {
        justify-content: center;
    }
}

@media screen and (max-width: 480px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    
    .hero__title {
        font-size: 1.75rem;
    }
    
    .stat__number {
        font-size: 2.5rem;
    }
    
    .scroll-top {
        bottom: 1rem;
        right: 1rem;
        width: 40px;
        height: 40px;
    }
}

/* ===========================
   Loading Animation
   =========================== */

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* ===========================
   Print Styles
   =========================== */

@media print {
    .header,
    .nav__toggle,
    .nav__close,
    .scroll-top,
    .hero__buttons,
    .contact__form {
        display: none;
    }
    
    body {
        font-size: 12pt;
    }
    
    a {
        text-decoration: underline;
    }
}