/* ===== Palette ===== */
:root {
    --c-bg: #ffffff;
    --c-bg-soft: #f4f2fb;
    --c-dark: #15102e;
    --c-dark-2: #221a4a;
    --c-primary: #6a4cff;
    --c-primary-hover: #5636f0;
    --c-accent: #18d1c0;
    --c-text: #1d1838;
    --c-text-muted: #5d5878;
    --c-text-light: #ffffff;
    --c-text-light-muted: rgba(255, 255, 255, 0.78);
    --c-border: #e3dff3;

    --radius: 16px;
    --shadow: 0 12px 32px rgba(21, 16, 46, 0.08);
    --header-h: 72px;
    --font: "Manrope", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}

/* ===== Base ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-h);
}

body {
    margin: 0;
    font-family: var(--font);
    font-size: 17px;
    line-height: 1.6;
    color: var(--c-text);
    background: var(--c-bg);
    -webkit-font-smoothing: antialiased;
}

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

a {
    color: inherit;
}

h1, h2, h3, h4 {
    margin: 0;
    line-height: 1.2;
}

p {
    margin: 0;
}

.container {
    width: 100%;
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 54px;
    padding: 0 30px;
    border: 2px solid transparent;
    border-radius: 999px;
    font: 700 14px/1 var(--font);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    text-decoration: none;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s, color 0.2s, transform 0.2s;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn--primary {
    background: var(--c-accent);
    color: var(--c-dark);
}

.btn--primary:hover {
    background: #2ee6d5;
}

.btn--ghost {
    border-color: rgba(255, 255, 255, 0.7);
    color: var(--c-text-light);
}

.btn--ghost:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: #fff;
}

/* ===== Header ===== */
.header {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 100;
    height: var(--header-h);
    transition: background-color 0.3s, box-shadow 0.3s;
}

.header.is-scrolled {
    background: rgba(21, 16, 46, 0.92);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.header__inner {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    color: var(--c-text-light);
    font-weight: 800;
    font-size: 20px;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    text-decoration: none;
}

.nav {
    display: flex;
    gap: 36px;
}

.nav a {
    position: relative;
    color: var(--c-text-light);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    text-decoration: none;
}

.nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -6px;
    width: 100%;
    height: 2px;
    background: var(--c-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.25s;
}

.nav a:hover::after {
    transform: scaleX(1);
}

.burger {
    display: none;
    width: 40px;
    height: 40px;
    padding: 8px;
    background: none;
    border: 0;
    cursor: pointer;
}

.burger span {
    display: block;
    height: 2px;
    margin: 5px 0;
    background: #fff;
    transition: transform 0.25s, opacity 0.25s;
}

.burger.is-open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.burger.is-open span:nth-child(2) {
    opacity: 0;
}

.burger.is-open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background-size: cover;
    background-position: center;
    color: var(--c-text-light);
}

.hero__overlay,
.clients__overlay,
.contact__overlay {
    position: absolute;
    inset: 0;
}

.hero__overlay {
    background: linear-gradient(120deg, rgba(21, 16, 46, 0.94) 0%, rgba(54, 30, 140, 0.82) 55%, rgba(24, 209, 192, 0.45) 100%);
}

.hero__content {
    position: relative;
    padding-top: var(--header-h);
}

.hero__title {
    font-size: clamp(44px, 7vw, 84px);
    font-weight: 800;
    letter-spacing: -0.02em;
}

.hero__subtitle {
    max-width: 640px;
    margin-top: 20px;
    font-size: clamp(18px, 2.2vw, 24px);
    color: var(--c-text-light-muted);
}

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 44px;
}

.hero__arrow {
    position: absolute;
    left: 50%;
    bottom: 36px;
    width: 22px;
    height: 22px;
    border-right: 2px solid #fff;
    border-bottom: 2px solid #fff;
    transform: translateX(-50%) rotate(45deg);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { translate: 0 0; }
    50% { translate: 0 8px; }
}

/* ===== Sections ===== */
.section {
    padding: 110px 0;
}

.eyebrow {
    margin-bottom: 14px;
    color: var(--c-primary);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.section__title {
    max-width: 760px;
    font-size: clamp(30px, 4vw, 46px);
    font-weight: 800;
    letter-spacing: -0.01em;
}

.section__title--light {
    color: var(--c-text-light);
}

.section__lead {
    max-width: 820px;
    margin-top: 22px;
    color: var(--c-text-muted);
    font-size: 18px;
}

.section__lead--light {
    color: var(--c-text-light-muted);
}

/* ===== Cards ===== */
.cards {
    display: grid;
    gap: 28px;
    margin-top: 56px;
}

.cards--2 { grid-template-columns: repeat(2, 1fr); }
.cards--3 { grid-template-columns: repeat(3, 1fr); }
.cards--4 { grid-template-columns: repeat(4, 1fr); }

.card {
    padding: 40px;
    background: var(--c-bg);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    color: var(--c-text-muted);
}

.card__icon {
    width: 76px;
    height: 76px;
    margin-bottom: 26px;
    border-radius: 50%;
    box-shadow: 0 0 0 6px rgba(106, 76, 255, 0.15);
}

.card__title {
    margin-bottom: 14px;
    color: var(--c-text);
    font-size: 23px;
    font-weight: 700;
}

.card--dark {
    background: var(--c-dark-2);
    border-color: rgba(255, 255, 255, 0.08);
    color: var(--c-text-light-muted);
}

.card--dark .card__title {
    color: var(--c-text-light);
}

.card--dark .card__icon {
    box-shadow: 0 0 0 6px rgba(24, 209, 192, 0.25);
}

/* ===== About ===== */
.about {
    background: var(--c-bg-soft);
}

/* ===== Services ===== */
.services {
    background: var(--c-dark);
    color: var(--c-text-light);
}

.services .eyebrow {
    color: var(--c-accent);
}

.services .section__title {
    color: var(--c-text-light);
}

.how {
    margin-top: 100px;
    padding-top: 80px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.how__title {
    font-size: clamp(28px, 3.4vw, 40px);
    font-weight: 800;
}

.how__lead {
    max-width: 820px;
    margin-top: 20px;
    color: var(--c-text-light-muted);
    font-size: 18px;
}

.how__sub {
    margin-top: 40px;
    color: var(--c-accent);
    font-weight: 700;
}

.how .cards {
    margin-top: 28px;
}

.feature {
    padding: 32px;
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--c-text-light-muted);
    transition: border-color 0.25s, background-color 0.25s;
}

.feature:hover {
    border-color: var(--c-accent);
    background: rgba(24, 209, 192, 0.06);
}

.feature__num {
    display: block;
    margin-bottom: 18px;
    color: var(--c-primary);
    font-size: 34px;
    font-weight: 800;
}

.feature__title {
    margin-bottom: 12px;
    color: var(--c-text-light);
    font-size: 19px;
    font-weight: 700;
}

/* ===== Clients ===== */
.clients {
    position: relative;
    background-size: cover;
    background-position: center;
    text-align: center;
}

.clients__overlay {
    background: linear-gradient(180deg, rgba(21, 16, 46, 0.92) 0%, rgba(54, 30, 140, 0.88) 100%);
}

.clients__content {
    position: relative;
}

.clients .section__title,
.clients .section__lead {
    margin-left: auto;
    margin-right: auto;
}

.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
    margin-top: 70px;
}

.stat__value {
    display: block;
    color: var(--c-accent);
    font-size: clamp(48px, 6vw, 72px);
    font-weight: 800;
    line-height: 1;
}

.stat__label {
    display: block;
    max-width: 220px;
    margin: 16px auto 0;
    color: var(--c-text-light);
    font-size: 15px;
    font-weight: 600;
}

/* ===== Get started ===== */
.start {
    background: var(--c-bg);
}

.step {
    position: relative;
    padding: 34px 28px;
    background: var(--c-bg-soft);
    border-radius: var(--radius);
    color: var(--c-text-muted);
    font-size: 16px;
}

.step__num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    margin-bottom: 20px;
    border-radius: 50%;
    background: var(--c-primary);
    color: #fff;
    font-weight: 800;
}

.step__title {
    margin-bottom: 10px;
    color: var(--c-text);
    font-size: 19px;
    font-weight: 700;
}

/* ===== Contact ===== */
.contact {
    position: relative;
    background-size: cover;
    background-position: center;
    text-align: center;
}

.contact__overlay {
    background: linear-gradient(135deg, rgba(21, 16, 46, 0.95) 0%, rgba(34, 26, 74, 0.9) 60%, rgba(24, 209, 192, 0.35) 100%);
}

.contact__content {
    position: relative;
}

.contact .section__title {
    margin: 0 auto;
    text-transform: uppercase;
}

.contact .section__lead {
    margin-left: auto;
    margin-right: auto;
}

.form {
    display: grid;
    grid-template-columns: repeat(3, 1fr) auto;
    gap: 14px;
    max-width: 980px;
    margin: 50px auto 0;
}

.form__input {
    min-height: 54px;
    padding: 0 20px;
    border: 2px solid transparent;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.95);
    color: var(--c-text);
    font: 500 16px var(--font);
    outline: none;
    transition: border-color 0.2s;
}

.form__input:focus {
    border-color: var(--c-accent);
}

.form__input.is-invalid {
    border-color: #ff5a7a;
}

.form__message {
    min-height: 28px;
    margin-top: 20px;
    color: var(--c-accent);
    font-weight: 600;
}

.form__message.is-error {
    color: #ff8aa1;
}

/* ===== Footer ===== */
.footer {
    padding: 64px 0 40px;
    background: var(--c-dark);
    color: var(--c-text-light-muted);
    font-size: 15px;
}

.footer__inner {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 24px 40px;
}

.footer__brand {
    color: var(--c-text-light);
    font-size: 22px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.footer__legal {
    font-style: normal;
    line-height: 1.8;
}

.footer__legal strong {
    color: var(--c-text-light);
}

.footer__legal a {
    color: var(--c-accent);
    text-decoration: none;
}

.footer__legal a:hover {
    text-decoration: underline;
}

.footer__copy {
    grid-column: 1 / -1;
    padding-top: 28px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 13px;
}

/* ===== Reveal animation ===== */
.js .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.js .reveal.is-visible {
    opacity: 1;
    transform: none;
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .js .reveal { opacity: 1; transform: none; transition: none; }
    .hero__arrow { animation: none; }
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .cards--4 { grid-template-columns: repeat(2, 1fr); }
    .cards--3 { grid-template-columns: 1fr; }
    .stats { grid-template-columns: repeat(2, 1fr); gap: 48px 28px; }
    .form { grid-template-columns: 1fr 1fr; }
    .form__btn { grid-column: 1 / -1; }
}

@media (max-width: 860px) {
    .burger { display: block; }

    .nav {
        position: fixed;
        top: var(--header-h);
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        padding: 12px 24px 24px;
        background: rgba(21, 16, 46, 0.98);
        transform: translateY(-12px);
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.25s, transform 0.25s, visibility 0.25s;
    }

    .nav.is-open {
        transform: none;
        opacity: 1;
        visibility: visible;
    }

    .nav a {
        padding: 14px 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .nav a::after { display: none; }

    .header.menu-open {
        background: rgba(21, 16, 46, 0.98);
    }

    .cards--2 { grid-template-columns: 1fr; }
    .footer__inner { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
    body { font-size: 16px; }
    .container { padding: 0 16px; }
    .section { padding: 80px 0; }
    .card { padding: 28px 24px; }
    .cards--4 { grid-template-columns: 1fr; }
    .stats { grid-template-columns: 1fr 1fr; }
    .form { grid-template-columns: 1fr; }
    .hero__actions .btn { width: 100%; }
}