:root {
    --primary: #00A3E0;
    --primary-dark: #0077a8;
    --secondary: #34A853;
    --dark: #1E2A3A;
    --light: #F8FBFD;
    --gray: #EFF3F8;
    --text: #1F2A44;
    --text-light: #5A6B8C;
    --white: #FFFFFF;
    --radius: 16px;
    --shadow: 0 12px 30px rgba(0,0,0,0.05);
    --transition: 0.2s ease;
}

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

body {
    font-family: 'Inter', sans-serif;
    color: var(--text);
    background: var(--white);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* header */
.header {
    background: var(--white);
    border-bottom: 1px solid var(--gray);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,0.96);
    backdrop-filter: blur(8px);
}
.header__inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.6rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--primary);
}
.logo i {
    font-size: 1.8rem;
}
.header__notice {
    font-size: 0.8rem;
    background: var(--gray);
    padding: 6px 14px;
    border-radius: 40px;
    color: var(--text-light);
}

/* buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: 60px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}
.btn--primary {
    background: var(--secondary);
    color: white;
    box-shadow: 0 4px 12px rgba(52,168,83,0.3);
}
.btn--primary:hover {
    background: #2c8e46;
    transform: scale(0.98);
}
.btn--full {
    width: 100%;
}

/* hero */
.hero {
    padding: 48px 0 32px;
}
.hero__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}
.hero__title {
    font-size: 2.8rem;
    line-height: 1.2;
    font-weight: 700;
    margin-bottom: 24px;
}
.hero__title .accent {
    color: var(--primary);
}
.hero__subtitle {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 28px;
}
.hero__stats {
    display: flex;
    gap: 24px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}
.hero__stat {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
}
.hero__stat i {
    color: var(--secondary);
}
.hero__image img {
    width: 100%;
    border-radius: var(--radius);
    object-fit: cover;
    aspect-ratio: 1/1;
    box-shadow: var(--shadow);
}

/* section common */
.section-head {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 48px;
}
.divider {
    text-align: center;
    margin-bottom: 20px;
}
.divider span {
    display: inline-block;
    width: 60px;
    height: 3px;
    background: var(--primary);
    border-radius: 4px;
}
.section-title {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 20px;
    text-align: center;
}
.section-subtitle {
    text-align: center;
    color: var(--text-light);
}

/* pricing */
.pricing {
    padding: 48px 0 32px;
    background: var(--light);
    margin: 32px 0;
}
.pricing__arrow {
    text-align: center;
    font-size: 2rem;
    color: var(--primary);
    animation: bounce 1.5s infinite;
}
@keyframes bounce { 0%,100%{transform:translateY(0);}50%{transform:translateY(10px);} }

/* form section */
.form-section {
    padding: 48px 0;
    background: linear-gradient(135deg, #f0f9ff 0%, #ffffff 100%);
}
.form-grid {
    display: grid;
    grid-template-columns: 1fr 0.9fr;
    gap: 40px;
    align-items: center;
}
.form-card {
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(2px);
    padding: 32px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid rgba(0,163,224,0.2);
}
.form-card__badge {
    background: var(--primary);
    color: white;
    display: inline-block;
    padding: 6px 18px;
    border-radius: 40px;
    font-size: 0.9rem;
    margin-bottom: 24px;
}
.input-group {
    display: flex;
    align-items: center;
    background: var(--white);
    border: 1px solid #ddd;
    border-radius: 60px;
    padding: 6px 20px;
    margin-bottom: 18px;
    transition: 0.2s;
}
.input-group:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0,163,224,0.2);
}
.input-group i {
    color: var(--text-light);
    margin-right: 12px;
    font-size: 1.1rem;
}
.input-group input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 1rem;
    padding: 12px 0;
    background: transparent;
}
.checkbox-custom {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 18px 0;
    cursor: pointer;
    font-size: 0.9rem;
}
.checkbox-custom input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}
.checkmark {
    width: 20px;
    height: 20px;
    background: white;
    border: 2px solid var(--primary);
    border-radius: 5px;
    display: inline-block;
    transition: 0.1s;
}
.checkbox-custom input:checked ~ .checkmark {
    background: var(--primary);
    position: relative;
}
.checkbox-custom input:checked ~ .checkmark:after {
    content: "✓";
    color: white;
    font-size: 14px;
    display: flex;
    justify-content: center;
    line-height: 1;
}
.form-secure {
    text-align: center;
    margin-top: 20px;
    font-size: 0.8rem;
    color: var(--text-light);
}
.form-image img {
    width: 100%;
    border-radius: var(--radius);
    object-fit: cover;
    aspect-ratio: 4/3;
    box-shadow: var(--shadow);
}

/* healthy water */
.healthy-water {
    padding: 64px 0;
}
.healthy__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}
.healthy__img img {
    width: 100%;
    border-radius: var(--radius);
}
.badges {
    display: flex;
    gap: 20px;
    margin-top: 24px;
}
.badges img {
    height: 50px;
    width: auto;
}

/* multistage */
.multistage {
    background: var(--light);
    padding: 64px 0;
}
.stage-cards {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 32px;
    margin-top: 32px;
}
.stage-card {
    background: white;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: 0.2s;
}
.stage-card img {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
}
.stage-card h3 {
    font-size: 1.4rem;
    margin: 16px 20px 8px;
}
.stage-card p {
    margin: 0 20px 20px;
    color: var(--text-light);
}

/* gallery */
.gallery {
    padding: 64px 0;
}
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(4,1fr);
    gap: 20px;
    margin: 32px 0;
}
.gallery-item {
    border-radius: 12px;
    overflow: hidden;
}
.gallery-item img {
    width: 100%;
    aspect-ratio: 1/1;
    object-fit: cover;
    transition: 0.3s;
}
.gallery-item img:hover {
    transform: scale(1.02);
}
.gallery-item.hidden {
    display: none;
}
.btn-more {
    display: block;
    margin: 20px auto 0;
    background: none;
    border: 2px solid var(--primary);
    color: var(--primary);
    padding: 10px 28px;
    border-radius: 40px;
    font-weight: 600;
    cursor: pointer;
    transition: 0.2s;
}
.btn-more:hover {
    background: var(--primary);
    color: white;
}

/* problems */
.problems {
    background: var(--gray);
    padding: 64px 0;
}
.problems-grid {
    display: grid;
    grid-template-columns: repeat(4,1fr);
    gap: 20px;
    margin-top: 32px;
}
.problem-card {
    background: white;
    padding: 20px;
    border-radius: 20px;
    text-align: center;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 12px;
    justify-content: center;
    transition: 0.2s;
    box-shadow: 0 4px 12px rgba(0,0,0,0.03);
}
.problem-card i {
    font-size: 1.6rem;
    color: var(--primary);
}

/* free test */
.free-test {
    padding: 64px 0;
    text-align: center;
}
.test-image {
    max-width: 600px;
    margin: 32px auto 0;
}
.test-image img {
    width: 100%;
    border-radius: var(--radius);
}

/* form bottom */
.form-bottom {
    padding: 48px 0;
    background: #0C2132;
}
.form-card--dark {
    background: rgba(255,255,255,0.95);
    max-width: 900px;
    margin: 0 auto;
}
.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px,1fr));
    gap: 16px;
}

/* installation */
.installation {
    padding: 64px 0;
}
.install-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    margin-top: 32px;
}
.install-img img {
    width: 100%;
    border-radius: var(--radius);
}

/* trust */
.trust {
    background: var(--light);
    padding: 64px 0;
}
.trust-grid {
    display: grid;
    grid-template-columns: repeat(6,1fr);
    gap: 24px;
    align-items: center;
    justify-items: center;
}
.trust-grid img {
    max-height: 60px;
    width: auto;
    filter: grayscale(0.2);
    opacity: 0.7;
    transition: 0.2s;
}
.trust-grid img:hover {
    opacity: 1;
    filter: none;
}

/* offer */
.offer {
    padding: 48px 0;
    text-align: center;
}
.coupon img {
    max-width: 400px;
    margin: 24px auto;
    border-radius: 20px;
    box-shadow: var(--shadow);
}
.source-note {
    text-align: center;
    font-size: 0.8rem;
    padding: 20px 0 40px;
    color: var(--text-light);
}

/* footer */
.footer {
    background: #1A2A3A;
    color: #CFDDE9;
    padding: 48px 0 24px;
    margin-top: auto;
}
.footer__grid {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 40px;
    margin-bottom: 40px;
}
.footer .logo {
    color: white;
    margin-bottom: 16px;
}
.footer h4, .footer h5 {
    color: white;
    margin-bottom: 16px;
    font-size: 1.1rem;
}
.footer ul {
    list-style: none;
}
.footer ul li {
    margin-bottom: 10px;
}
.footer a {
    color: #CFDDE9;
    text-decoration: none;
}
.footer a:hover {
    color: white;
}
.disclaimer p {
    font-size: 0.75rem;
    line-height: 1.4;
}
.footer__copyright {
    border-top: 1px solid #2A3E52;
    padding-top: 24px;
    text-align: center;
    font-size: 0.8rem;
}

/* cookie notice */
.cookie-notice {
    position: fixed;
    bottom: 20px;
    left: 20px;
    right: 20px;
    background: #1A2A3A;
    color: white;
    padding: 16px 24px;
    border-radius: 60px;
    display: none;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    z-index: 1000;
    flex-wrap: wrap;
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}
.cookie-notice.show {
    display: flex;
}
.cookie-notice button {
    background: var(--primary);
    border: none;
    padding: 8px 24px;
    border-radius: 40px;
    color: white;
    font-weight: 600;
    cursor: pointer;
}

@media (max-width: 992px) {
    .hero__grid, .healthy__grid, .form-grid, .install-grid, .footer__grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .stage-cards, .problems-grid, .trust-grid {
        grid-template-columns: repeat(2,1fr);
    }
    .gallery-grid {
        grid-template-columns: repeat(3,1fr);
    }
    .hero__title {
        font-size: 2rem;
    }
}
@media (max-width: 640px) {
    .stage-cards, .problems-grid, .trust-grid, .gallery-grid {
        grid-template-columns: 1fr;
    }
    .header__inner {
        flex-direction: column;
    }
    .cookie-notice {
        border-radius: 16px;
        flex-direction: column;
        text-align: center;
    }
}