/* Base */
* {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}

body {
    margin: 0;
    font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif;
    color: #0b1220;
    background: #ffffff;
    padding-top: 64px;
    /* compensate for fixed header */
}

html {
    scroll-behavior: smooth;
}

a {
    color: inherit;
    text-decoration: none;
}

/* Layout */
.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    transition: box-shadow 200ms ease;
}

.site-header.is-scrolled {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    font-size: 26px;
    font-weight: 800;
    letter-spacing: 0.5px;
}

.nav-toggle {
    display: none;
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    border-radius: 8px;
    position: relative;
    cursor: pointer;
}

.nav-toggle:hover {
    background: rgba(0, 0, 0, 0.05);
}

.nav-toggle:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(41, 87, 255, 0.25);
}

.nav-toggle .nav-toggle-bar,
.nav-toggle .nav-toggle-bar::before,
.nav-toggle .nav-toggle-bar::after {
    content: '';
    position: absolute;
    left: 10px;
    right: 10px;
    height: 2px;
    background: #0b1220;
    border-radius: 2px;
    transition: transform 200ms ease, opacity 200ms ease, top 200ms ease;
}

.nav-toggle .nav-toggle-bar {
    top: 19px;
}

.nav-toggle .nav-toggle-bar::before {
    top: -8px;
}

.nav-toggle .nav-toggle-bar::after {
    top: 8px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar {
    transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar::before {
    top: 0;
    transform: rotate(90deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar::after {
    opacity: 0;
}

.nav a {
    margin-left: 20px;
    padding: 8px 10px;
    border-radius: 8px;
    transition: background 200ms ease;
}

.nav a:hover {
    background: rgba(0, 0, 0, 0.05);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 18px;
    border-radius: 10px;
    font-weight: 600;
    transition: transform 150ms ease, box-shadow 150ms ease;
}

.btn.primary {
    background: #2957ff;
    color: #fff;
    box-shadow: 0 8px 20px rgba(41, 87, 255, 0.25);
}

.btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 24px rgba(41, 87, 255, 0.3);
}

.btn.secondary {
    background: #0b1220;
    color: #fff;
}

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

/* Hero */
.hero {
    position: relative;
    padding: 92px 0 72px;
    overflow: hidden;
    scroll-margin-top: 72px;
}

.hero-title {
    font-size: 36px;
    line-height: 1.2;
    margin: 0 0 12px;
    letter-spacing: 0.2px;
}

.hero-subtitle {
    margin: 0 0 22px;
    color: #3b4457;
}

.hero-decor {
    position: absolute;
    right: -120px;
    top: -120px;
    width: 420px;
    height: 420px;
    background: radial-gradient(circle at 30% 30%, rgba(41, 87, 255, 0.35), rgba(255, 255, 255, 0) 60%), conic-gradient(from 90deg, rgba(41, 87, 255, 0.15), rgba(255, 0, 132, 0.1), rgba(0, 199, 120, 0.12), rgba(41, 87, 255, 0.15));
    filter: blur(18px);
    border-radius: 50%;
    animation: spin 34s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(1turn);
    }
}

/* Carousel */
.carousel {
    position: relative;
    padding: 20px 0 60px;
}

.carousel-viewport {
    position: relative;
    height: 320px;
    border-radius: 16px;
    overflow: hidden;
}

.slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    transform: scale(1.02);
    transition: opacity 600ms ease, transform 800ms ease;
    display: grid;
}

.slide.is-active {
    opacity: 1;
    transform: scale(1);
}

.slide-bg {
    position: absolute;
    inset: 0;
}

.gradient-1 {
    background: linear-gradient(135deg, #e3f0ff 0%, #f5ecff 100%);
}

.gradient-2 {
    background: linear-gradient(135deg, #e9fff5 0%, #eaf4ff 100%);
}

.gradient-3 {
    background: linear-gradient(135deg, #fff3f8 0%, #f1f7ff 100%);
}

.slide-content {
    position: relative;
    align-self: end;
    padding: 28px;
}

.slide-content h3 {
    margin: 0 0 6px;
}

.slide-content p {
    margin: 0;
    color: #3b4457;
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: rgba(11, 18, 32, 0.7);
    color: #fff;
    cursor: pointer;
    z-index: 2;
}

.carousel-btn:hover {
    background: rgba(11, 18, 32, 0.9);
}

.carousel-btn.prev {
    left: 10px;
}

.carousel-btn.next {
    right: 10px;
}

.carousel-dots {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-top: 14px;
}

.carousel-dots button {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    border: none;
    background: #c7cfdd;
    cursor: pointer;
    transition: transform 150ms ease, background 150ms ease;
}

.carousel-dots button[aria-selected="true"] {
    background: #2957ff;
    transform: scale(1.25);
}

/* Sections */
.section {
    padding: 72px 0;
    scroll-margin-top: 72px;
}

.section-title {
    font-size: 28px;
    margin: 0 0 22px;
}

.service-grid {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.service-card {
    padding: 18px;
    border-radius: 12px;
    background: #f7f9fc;
    border: 1px solid #e6ebf2;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}

.two-col {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 28px;
    align-items: center;
}

.about-visual {
    height: 220px;
    border-radius: 16px;
    background-image: url(../images/home.png);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    border: 1px solid #e6ebf2;
}

.ticks {
    margin: 12px 0 0;
    padding-left: 18px;
}

.ticks li {
    margin: 6px 0;
}

/* Contact */
.contact-form {
    display: grid;
    gap: 12px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

input,
textarea {
    width: 100%;
    padding: 12px 14px;
    border-radius: 10px;
    border: 1px solid #d9e1ec;
    font: inherit;
}

input:focus,
textarea:focus {
    outline: none;
    border-color: #2957ff;
    box-shadow: 0 0 0 4px rgba(41, 87, 255, 0.12);
}

/* Footer */
.site-footer {
    padding: 28px 0;
    border-top: 1px solid #eef2f7;
    color: #3b4457;
}

/* Reveal animations */
.fade-in {
    opacity: 0;
    transform: translateY(12px);
}

.fade-in.is-visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 600ms ease, transform 600ms ease;
}

.floating {
    animation: float 6s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-8px);
    }
}

/* Responsive */
@media (max-width: 960px) {
    .nav-toggle {
        display: inline-block;
    }

    .nav {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        border-bottom: 1px solid #eaeef5;
        display: none;
        gap: 8px;
        padding: 12px 20px 16px;
    }

    .nav.is-open {
        display: grid;
    }

    .nav a {
        margin-left: 0;
        padding: 12px;
    }

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

    .two-col {
        grid-template-columns: 1fr;
    }

    .hero-title {
        font-size: 30px;
    }
}

@media (max-width: 600px) {
    .header-inner {
        height: 56px;
    }

    .nav {
        top: 56px;
    }

    .nav a {
        margin-left: 12px;
    }

    .carousel-viewport {
        height: 260px;
    }

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

    body {
        padding-top: 56px;
    }
}