:root {
    --ice-100: #e6f7ff;
    --ice-300: #b8e8ff;
    --ice-500: #79cfff;
    --ice-700: #2c8ed6;
    --night-900: #071423;
    --night-800: #10253a;
    --night-700: #17334f;
    --warm-500: #f0b36f;
    --text-primary: #eef8ff;
    --text-secondary: #bfd4e6;
    --border-color: rgba(121, 207, 255, 0.25);
    --card-bg: rgba(8, 27, 45, 0.74);
    --transition: all 0.28s ease;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 24px;
}

body {
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background:
        radial-gradient(circle at 12% 20%, rgba(121, 207, 255, 0.2), transparent 30%),
        radial-gradient(circle at 88% 80%, rgba(240, 179, 111, 0.14), transparent 34%),
        linear-gradient(160deg, var(--night-900) 0%, var(--night-800) 45%, var(--night-700) 100%);
    color: var(--text-primary);
    line-height: 1.6;
    padding-top: 0;
    min-height: 100vh;
}

.snowfall,
.snowfall::before,
.snowfall::after {
    content: "";
    position: fixed;
    inset: -10%;
    pointer-events: none;
    z-index: 4;
    background-image:
        radial-gradient(circle, rgba(255, 255, 255, 0.95) 1.1px, transparent 1.2px),
        radial-gradient(circle, rgba(210, 236, 255, 0.85) 1.6px, transparent 1.7px),
        radial-gradient(circle, rgba(255, 255, 255, 0.72) 2.2px, transparent 2.3px);
    background-size: 180px 180px, 260px 260px, 340px 340px;
    background-position: 0 0, 40px -120px, 120px -240px;
    animation: snowfall 18s linear infinite;
    opacity: 0.6;
}

.snowfall::before {
    animation-duration: 26s;
    animation-direction: reverse;
    opacity: 0.42;
    transform: scale(1.08);
}

.snowfall::after {
    animation-duration: 34s;
    opacity: 0.32;
    transform: scale(1.16);
}

@keyframes snowfall {
    0% {
        transform: translate3d(0, -12%, 0);
    }
    100% {
        transform: translate3d(-4%, 14%, 0);
    }
}

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: transparent;
    backdrop-filter: none;
    border: 0 !important;
    box-shadow: none !important;
    outline: none !important;
    z-index: 1000;
    padding: 0.2rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.logo {
    display: inline-flex;
    align-items: center;
}

.logo-image {
    width: 170px;
    max-width: 30vw;
    height: auto;
    filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.35));
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 1.3rem;
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
    font-weight: 600;
}

.nav-link:hover {
    color: var(--ice-300);
}

.nav-link::after {
    content: "";
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--ice-500), var(--warm-500));
    transition: var(--transition);
}

.nav-link:hover::after {
    width: 100%;
}

.login-btn {
    background: linear-gradient(135deg, var(--ice-700), var(--ice-500));
    color: #fff !important;
    padding: 0.42rem 1rem;
    border-radius: 999px;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 24px rgba(44, 142, 214, 0.35);
}

.login-btn::after {
    content: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    text-align: center;
    margin-top: 0;
    padding-top: 0;
}

.hero-background {
    position: absolute;
    inset: 0;
    z-index: 0;
    background:
        linear-gradient(170deg, rgba(3, 11, 19, 0.66), rgba(5, 17, 29, 0.78)),
        url("../assets/what-shader-is-the-best-for-a-cozy-winter-vibe-v0-lre5ob5p9o0g1.png") center/cover no-repeat;
}

.hero-background::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 25% 30%, rgba(184, 232, 255, 0.16), transparent 30%),
        radial-gradient(circle at 80% 18%, rgba(184, 232, 255, 0.14), transparent 26%),
        radial-gradient(circle at 70% 78%, rgba(240, 179, 111, 0.13), transparent 30%);
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 920px;
    padding: 0 1rem;
}

.hero-tag {
    display: inline-block;
    background: rgba(121, 207, 255, 0.16);
    border: 1px solid rgba(184, 232, 255, 0.45);
    color: var(--ice-100);
    border-radius: 999px;
    padding: 0.35rem 1rem;
    margin-bottom: 1.4rem;
    font-size: 0.88rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.hero-title {
    font-size: clamp(2.3rem, 7vw, 5rem);
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--ice-100);
    text-shadow: 0 10px 30px rgba(6, 20, 34, 0.55);
}

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.35rem);
    color: var(--text-primary);
    max-width: 760px;
    margin: 0 auto 2.6rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.95rem 2rem;
    border-radius: 999px;
    border: none;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: var(--transition);
}

.btn-primary {
    background: linear-gradient(135deg, var(--ice-700), var(--ice-500));
    color: white;
    box-shadow: 0 10px 25px rgba(44, 142, 214, 0.38);
}

.btn-primary:hover {
    transform: translateY(-3px);
}

.btn-secondary {
    background: rgba(184, 232, 255, 0.1);
    border: 2px solid rgba(184, 232, 255, 0.4);
    color: var(--ice-100);
}

.btn-secondary:hover {
    background: rgba(184, 232, 255, 0.24);
    transform: translateY(-3px);
}

.btn-danger {
    background: linear-gradient(135deg, #dc2626, #ef4444);
    color: #fff;
    box-shadow: 0 10px 25px rgba(239, 68, 68, 0.32);
}

.btn-danger:hover {
    transform: translateY(-3px);
    box-shadow: 0 16px 30px rgba(239, 68, 68, 0.4);
}

.btn-large {
    padding: 1.15rem 2.9rem;
    font-size: 1.06rem;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.2rem;
}

.stat {
    background: rgba(8, 27, 45, 0.62);
    border: 1px solid rgba(184, 232, 255, 0.28);
    border-radius: 14px;
    padding: 1rem 0.8rem;
}

.stat h3 {
    font-size: 1.3rem;
    color: var(--ice-300);
    margin-bottom: 0.2rem;
}

.stat p {
    color: var(--text-secondary);
    font-size: 0.92rem;
}

.features,
.pricing,
.download {
    padding: 5.5rem 0;
    position: relative;
    z-index: 1;
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 3rem);
    font-weight: 800;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--ice-100);
}

.features-grid,
.pricing-grid,
.faq-grid {
    display: grid;
    gap: 1.4rem;
}

.features-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.feature-card,
.step,
.pricing-card,
.faq-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 14px;
}

.feature-card {
    padding: 1.8rem;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-6px);
    border-color: rgba(184, 232, 255, 0.52);
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.25);
}

.feature-icon {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--ice-300);
    margin-bottom: 0.8rem;
}

.feature-card h3 {
    margin-bottom: 0.55rem;
}

.feature-card p {
    color: var(--text-secondary);
}

.how-it-works,
.faq {
    padding: 5.5rem 0;
    border-top: 1px solid rgba(121, 207, 255, 0.18);
    border-bottom: 1px solid rgba(121, 207, 255, 0.18);
    background: linear-gradient(180deg, rgba(7, 20, 35, 0.75), rgba(8, 28, 46, 0.7));
}

.steps {
    display: flex;
    justify-content: center;
    align-items: stretch;
    gap: 1rem;
    flex-wrap: wrap;
}

.step {
    text-align: center;
    padding: 1.6rem;
    flex: 1;
    min-width: 230px;
    max-width: 320px;
}

.step-number {
    font-size: 2rem;
    color: var(--ice-300);
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.step p,
.download-subtitle,
.download-note,
.faq-answer,
.footer-section p,
.footer-section a,
.footer-bottom {
    color: var(--text-secondary);
}

.step-arrow {
    font-size: 1.8rem;
    color: var(--ice-300);
    align-self: center;
}

.pricing-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    max-width: 1020px;
    margin: 0 auto;
}

.pricing-card {
    padding: 1.9rem;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.pricing-card:hover {
    transform: translateY(-5px);
    border-color: rgba(184, 232, 255, 0.5);
}

.pricing-card.featured {
    background: linear-gradient(160deg, rgba(21, 52, 78, 0.85), rgba(9, 29, 47, 0.9));
    border-color: rgba(184, 232, 255, 0.55);
    transform: scale(1.03);
}

.pricing-badge {
    display: inline-block;
    background: rgba(121, 207, 255, 0.16);
    color: var(--ice-300);
    border: 1px solid rgba(184, 232, 255, 0.3);
    padding: 0.4rem 0.9rem;
    border-radius: 999px;
    font-size: 0.82rem;
    font-weight: 700;
    margin-bottom: 1rem;
    width: fit-content;
}

.pricing-badge.popular {
    background: linear-gradient(135deg, var(--ice-700), var(--warm-500));
    color: #fff;
    border-color: transparent;
}

.pricing-card h3 {
    font-size: 1.7rem;
    margin-bottom: 0.35rem;
}

.price {
    font-size: 2rem;
    color: var(--ice-300);
    margin-bottom: 0.8rem;
    font-weight: 800;
}

.price span {
    font-size: 1rem;
    color: var(--text-secondary);
}

.pricing-features {
    list-style: none;
    margin: 1.4rem 0;
    flex: 1;
}

.pricing-features li {
    padding: 0.6rem 0;
    border-bottom: 1px solid rgba(121, 207, 255, 0.12);
    color: var(--text-secondary);
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-card button {
    margin-top: auto;
    align-self: flex-start;
}

.faq-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.faq-item {
    padding: 1.6rem;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: rgba(184, 232, 255, 0.52);
    transform: translateY(-4px);
}

.faq-question {
    color: var(--ice-300);
    margin-bottom: 0.7rem;
    font-size: 1.08rem;
}

.download {
    text-align: center;
}

.download-subtitle {
    font-size: 1.15rem;
    max-width: 690px;
    margin: 0 auto 2rem;
}

.download-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 1.2rem;
    flex-wrap: wrap;
}

.footer {
    background: linear-gradient(135deg, rgba(4, 14, 24, 0.92), rgba(11, 30, 47, 0.86));
    border-top: 1px solid rgba(121, 207, 255, 0.22);
    padding: 3.4rem 0 1.8rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2.2rem;
    margin-bottom: 1.6rem;
}

.footer-section h4 {
    color: var(--ice-100);
    margin-bottom: 0.7rem;
}

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

.footer-section ul li {
    margin-bottom: 0.6rem;
}

.footer-section a {
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--ice-100);
}

.footer-bottom {
    text-align: center;
    padding-top: 1.4rem;
    border-top: 1px solid rgba(121, 207, 255, 0.13);
    font-size: 0.9rem;
}

@media (max-width: 900px) {
    .nav-container {
        flex-direction: row;
        align-items: center;
    }

    .nav-menu {
        width: auto;
        justify-content: flex-end;
        gap: 0.8rem;
        flex-wrap: wrap;
    }

    .hero {
        min-height: 92vh;
    }

    .pricing-card.featured {
        transform: scale(1);
    }
}

@media (max-width: 640px) {
    .container,
    .nav-container {
        padding: 0 1rem;
    }

    .logo-image {
        width: 138px;
        max-width: 42vw;
    }

    .nav-menu {
        gap: 0.65rem;
    }

    .nav-link {
        font-size: 0.84rem;
    }

    .hero-subtitle {
        margin-bottom: 1.8rem;
    }

    .step-arrow {
        transform: rotate(90deg);
        margin: 0.2rem 0;
    }

    .btn,
    .btn-large {
        width: 100%;
        max-width: 320px;
    }

    .snowfall,
    .snowfall::before,
    .snowfall::after {
        opacity: 0.4;
    }
}