/* ===== CSS Variables ===== */
:root {
    --primary: #5b6cf0;
    --primary-dark: #4854c7;
    --primary-light: #8b96f5;
    --secondary: #fbbf24;
    --text: #1f2937;
    --text-light: #6b7280;
    --text-muted: #9ca3af;
    --bg: #ffffff;
    --bg-alt: #f9fafb;
    --bg-dark: #111827;
    --border: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --radius: 8px;
    --radius-lg: 12px;
    --transition: all 0.3s ease;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

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

ul {
    list-style: none;
}

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

/* ===== Header & Navigation ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

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

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

.nav__logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo-img {
    height: 48px;
    width: auto;
}

.nav__menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav__link {
    padding: 8px 16px;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-light);
    border-radius: var(--radius);
    transition: var(--transition);
}

.nav__link:hover,
.nav__link.active {
    color: var(--primary);
    background: rgba(91, 108, 240, 0.08);
}

.nav__link--cta {
    color: #fff;
    background: var(--primary);
}

.nav__link--cta:hover {
    color: #fff;
    background: var(--primary-dark);
}

.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav__toggle span {
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 100px 0 60px;
    overflow: hidden;
}

.hero__background {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #f0f4ff 0%, #e8ecfe 50%, #dde3fc 100%);
    z-index: -2;
}

.hero__background::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 80%, rgba(91, 108, 240, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(91, 108, 240, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(139, 150, 245, 0.1) 0%, transparent 40%);
}

.hero__content {
    max-width: 800px;
}

.hero__title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    color: var(--text);
    margin-bottom: 24px;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.hero__subtitle {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    color: var(--text-light);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    font-family: var(--font);
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn--primary {
    color: #fff;
    background: var(--primary);
    box-shadow: 0 4px 14px rgba(91, 108, 240, 0.4);
}

.btn--primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(91, 108, 240, 0.5);
    color: #fff;
}

/* ===== Sections ===== */
.section {
    padding: 70px 0;
}

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

.section__title {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 700;
    color: var(--text);
    text-align: center;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.section__intro {
    font-size: 1.125rem;
    color: var(--text-light);
    text-align: center;
    max-width: 700px;
    margin: 0 auto 40px;
}

/* ===== Features (About Section) ===== */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    margin-top: 48px;
}

.feature {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 28px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

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

.feature__icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: var(--radius);
}

.feature__icon svg {
    width: 24px;
    height: 24px;
    stroke: #fff;
}

.feature p {
    color: var(--text-light);
    line-height: 1.7;
}

/* ===== Content Block ===== */
.content-block {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.content-block p {
    font-size: 1.125rem;
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 24px;
}

.content-block p:last-child {
    margin-bottom: 0;
}

/* ===== Clients Grid ===== */
.clients-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 32px;
}

.client-card {
    padding: 40px 32px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
}

.client-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-xl);
    transform: translateY(-8px);
}

.client-card__icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: 50%;
}

.client-card__icon svg {
    width: 28px;
    height: 28px;
    stroke: #fff;
}

.client-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 12px;
}

.client-card p {
    color: var(--text-light);
    line-height: 1.7;
}

/* ===== Alerts ===== */
.alert {
    padding: 16px 20px;
    border-radius: var(--radius);
    margin-bottom: 32px;
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
}

.alert--success {
    background: #ecfdf5;
    border: 1px solid #10b981;
    color: #065f46;
}

.alert--error {
    background: #fef2f2;
    border: 1px solid #ef4444;
    color: #991b1b;
}

.alert p {
    margin: 0;
    text-align: center;
}

/* ===== Contact Section ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
    max-width: 1000px;
    margin: 0 auto;
    align-items: start;
}

.contact-info h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 16px;
}

.contact-info > p {
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 32px;
}

.contact-method {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: var(--bg-alt);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
}

.contact-method__icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: var(--radius);
    flex-shrink: 0;
}

.contact-method__icon svg {
    width: 24px;
    height: 24px;
    stroke: #fff;
}

.contact-method strong {
    display: block;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.contact-method a {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--primary);
}

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

/* ===== Contact Form ===== */
.contact-form {
    padding: 32px;
    background: var(--bg-alt);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 24px;
}

.form-row .form-group {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    font-family: var(--font);
    font-size: 1rem;
    color: var(--text);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(91, 108, 240, 0.15);
}

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

.form-group textarea {
    resize: vertical;
    min-height: 140px;
}

.contact-form .btn {
    width: 100%;
}

/* ===== Footer ===== */
.footer {
    background: var(--bg-alt);
    border-top: 1px solid var(--border);
    padding: 48px 0 24px;
}

.footer__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border);
}

.footer h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text);
}

.footer__company p {
    font-size: 0.9375rem;
    color: var(--text-light);
    margin-bottom: 4px;
}

.footer__projects ul li {
    margin-bottom: 10px;
    font-size: 0.9375rem;
    color: var(--text-light);
}

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

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

.footer__bottom {
    padding-top: 24px;
    text-align: center;
}

.footer__bottom p {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .nav__toggle {
        display: flex;
    }

    .nav__menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--bg);
        padding: 24px;
        gap: 8px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .nav__menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav__link {
        width: 100%;
        text-align: center;
        padding: 12px 16px;
    }

    .nav__toggle.active span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

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

    .nav__toggle.active span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    .hero {
        padding: 90px 0 50px;
        min-height: auto;
    }

    .section {
        padding: 50px 0;
    }

    .features {
        gap: 20px;
    }

    .feature {
        flex-direction: column;
        text-align: center;
        align-items: center;
    }

    .logo-img {
        height: 40px;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .contact-form {
        padding: 24px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero__title {
        font-size: 2rem;
    }

    .section__title {
        font-size: 1.75rem;
    }

    .client-card {
        padding: 32px 24px;
    }
}

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

.animate-in {
    animation: fadeInUp 0.6s ease forwards;
}

/* ===== Scroll animations ===== */
.feature,
.client-card {
    opacity: 0;
    transform: translateY(20px);
}

.feature.visible,
.client-card.visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s ease, transform 0.6s ease;
}