:root {
    --color-bg-deep: #001A4D;
    --color-bg-primary: #003399;
    --color-bg-light: #F5F7FA;
    --color-text-main: #FFFFFF;
    --color-text-secondary: #CBD5E0;
    --color-text-dark: #1A202C;
    --color-accent-red: #D32F2F;
    --color-accent-red-hover: #B71C1C;
    --color-accent-green: #39FF14;
    --color-white: #FFFFFF;

    --font-main: 'Inter', sans-serif;
    --font-accent: 'Outfit', sans-serif;

    --container-width: 1200px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--color-bg-deep);
    color: var(--color-text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.btn {
    display: inline-block;
    padding: 14px 28px;
    border-radius: 8px;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-size: 16px;
    text-align: center;
}

.btn--sm {
    padding: 8px 16px;
    font-size: 14px;
}

.btn--primary {
    background-color: var(--color-accent-red);
    color: var(--color-white);
    box-shadow: 0 4px 15px rgba(211, 47, 47, 0.4);
}

.btn--primary:hover {
    background-color: var(--color-accent-red-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(211, 47, 47, 0.5);
}

.btn--outline {
    background: transparent;
    border: 2px solid var(--color-white);
    color: var(--color-white);
}

.btn--outline:hover {
    background: var(--color-white);
    color: var(--color-bg-primary);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(0, 51, 153, 0.9);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header__container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-accent);
    font-size: 24px;
    font-weight: 800;
    letter-spacing: 1px;
}

.nav__list {
    display: flex;
    gap: 30px;
}

.nav__link:hover {
    color: var(--color-accent-green);
}

.header__contacts {
    display: flex;
    align-items: center;
    gap: 20px;
}

.header__contacts--mobile {
    display: none;
}

.header__phone {
    font-size: 20px;
    font-weight: 700;
    font-family: var(--font-accent);
}

.burger {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
}

.burger span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--color-white);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    padding-top: 150px;
    padding-bottom: 80px;
    background: radial-gradient(circle at right, #0044CC 0%, #001A4D 70%);
    position: relative;
    min-height: 80vh;
    display: flex;
    align-items: center;
}

.hero__container {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 40px;
    align-items: center;
}

.hero__title {
    font-family: var(--font-accent);
    font-size: 48px;
    line-height: 1.1;
    margin-bottom: 24px;
    font-weight: 700;
}

.hero__subtitle {
    font-size: 18px;
    color: var(--color-text-secondary);
    margin-bottom: 32px;
    max-width: 600px;
}

.hero__features {
    margin-bottom: 40px;
}

.hero__feature {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 15px;
}

.feature__icon {
    color: var(--color-accent-green);
    font-size: 20px;
}

.feature__text {
    font-weight: 500;
}

.hero__image {
    position: relative;
    display: flex;
    justify-content: center;
}

.hero__image img {
    filter: drop-shadow(0 0 30px rgba(0, 51, 153, 0.5));
    animation: float 6s ease-in-out infinite;
}

@keyframes float {

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

    50% {
        transform: translateY(-20px);
    }
}

/* Section Commons */
.section-title {
    font-family: var(--font-accent);
    font-size: 36px;
    text-align: center;
    margin-bottom: 50px;
    font-weight: 700;
}

.section-title--dark {
    color: var(--color-text-dark);
}

/* Problems & Solution */
.problems {
    background-color: var(--color-bg-light);
    padding: 100px 0;
    color: var(--color-text-dark);
}

.problems__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.problem-card,
.solution-card {
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.problem-card {
    background: #fff;
    border-top: 4px solid #CBD5E0;
}

.solution-card {
    background: #fff;
    border-top: 4px solid var(--color-accent-green);
}

.problem-card__header,
.solution-card__header {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 25px;
}

.problem-card__list li,
.solution-card__list li {
    margin-bottom: 12px;
    padding-left: 25px;
    position: relative;
}

.problem-card__list li::before {
    content: '✕';
    position: absolute;
    left: 0;
    color: #E53E3E;
}

.solution-card__list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-accent-green);
}

/* Tech Specs */
.tech-specs {
    padding: 100px 0;
    background: var(--color-bg-deep);
}

.tech-specs__desc {
    text-align: center;
    max-width: 700px;
    margin: -30px auto 60px;
    color: var(--color-text-secondary);
}

.tech-specs__grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
    align-items: center;
}

.tooth-infographic {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 200px 200px 20px 20px;
    padding: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    height: 400px;
}

.tooth-layer {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.layer-incisal {
    height: 30%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 0%, rgba(255, 255, 255, 0.05) 100%);
    border-radius: 180px 180px 0 0;
    border-bottom: 1px dashed rgba(255, 255, 255, 0.2);
}

.layer-transition {
    height: 30%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.02) 100%);
    border-bottom: 1px dashed rgba(255, 255, 255, 0.2);
}

.layer-cervical {
    height: 40%;
    background: linear-gradient(135deg, rgba(0, 51, 153, 0.3) 0%, rgba(0, 26, 77, 0.5) 100%);
    border-radius: 0 0 10px 10px;
}

.layer-label {
    font-weight: 700;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.layer-stat {
    color: var(--color-accent-green);
    font-weight: 600;
    font-size: 18px;
    margin-top: 5px;
}

.spec-item {
    background: rgba(255, 255, 255, 0.03);
    padding: 25px;
    border-radius: 10px;
    margin-bottom: 20px;
    border-left: 4px solid var(--color-bg-primary);
}

.spec-item h3 {
    margin-bottom: 10px;
    color: var(--color-accent-green);
}

.seo-note {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.4);
    margin-top: 30px;
    font-style: italic;
}

/* Raw Materials */
.raw-materials {
    padding: 100px 0;
    background: radial-gradient(circle at left, rgba(0, 51, 153, 0.2) 0%, rgba(0, 26, 77, 0.4) 100%);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.raw-materials__content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.raw-materials__title {
    font-size: 32px;
    margin-bottom: 25px;
    color: var(--color-white);
}

.raw-materials__list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 40px;
    text-align: left;
}

.raw-materials__list li {
    background: rgba(255, 255, 255, 0.05);
    padding: 15px 20px;
    border-radius: 8px;
    border-left: 3px solid var(--color-accent-green);
}

/* Usage Section */
.usage {
    background-color: var(--color-white);
    padding: 100px 0;
    color: var(--color-text-dark);
}

.usage__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.usage__item {
    text-align: center;
    padding: 30px;
    background: var(--color-bg-light);
    border-radius: 12px;
    transition: var(--transition);
}

.usage__item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.usage__icon {
    font-size: 40px;
    display: block;
    margin-bottom: 20px;
}

.usage__item h4 {
    margin-bottom: 10px;
    font-size: 18px;
}

.usage__item p {
    font-size: 14px;
    color: #718096;
}

/* Promo section */
.promo {
    padding: 100px 0;
    background-color: var(--color-bg-deep);
}

.promo__card {
    background: linear-gradient(135deg, var(--color-bg-primary) 0%, #001A4D 100%);
    border: 2px solid var(--color-accent-red);
    border-radius: 20px;
    padding: 60px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.promo__title {
    font-size: 32px;
    margin-bottom: 20px;
}

.promo__badge {
    background: var(--color-accent-red);
    color: white;
    display: inline-block;
    padding: 10px 25px;
    font-size: 28px;
    font-weight: 800;
    border-radius: 5px;
    margin-bottom: 25px;
    transform: rotate(-2deg);
}

.promo__text {
    font-size: 20px;
    margin-bottom: 20px;
}

.promo__bonus {
    color: var(--color-accent-green);
    font-weight: 600;
    font-size: 18px;
}

.form {
    background: rgba(255, 255, 255, 0.05);
    padding: 40px;
    border-radius: 15px;
}

.form__title {
    font-size: 22px;
    margin-bottom: 30px;
    text-align: center;
}

.form__group {
    margin-bottom: 20px;
}

.form__input {
    width: 100%;
    padding: 15px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    color: white;
    font-size: 16px;
}

.form__input:focus {
    outline: none;
    border-color: var(--color-accent-green);
}

.form__btn {
    width: 100%;
}

/* Footer */
.footer {
    background: #000B1D;
    padding: 80px 0 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer__info p {
    margin-top: 20px;
    color: var(--color-text-secondary);
}

.footer__legal {
    font-weight: 600;
    color: white !important;
}

.footer__contacts h4,
.footer__social h4 {
    margin-bottom: 25px;
    text-transform: uppercase;
    font-size: 14px;
    letter-spacing: 1px;
}

.footer__link {
    display: block;
    margin-bottom: 15px;
    font-size: 18px;
    font-weight: 600;
}

.footer__social {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.footer__bottom {
    text-align: center;
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: rgba(255, 255, 255, 0.3);
    font-size: 14px;
}

/* Particles/Glow */
.dust-particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
}

/* Responsive */
@media (max-width: 1024px) {
    .header__contacts--desktop {
        display: none;
    }

    .burger {
        display: flex;
        z-index: 1100;
        position: relative;
    }

    .burger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 6px);
    }
    .burger.active span:nth-child(2) {
        opacity: 0;
    }
    .burger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -6px);
    }

    .header__nav {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background-color: rgba(0, 26, 77, 0.98);
        padding: 100px 20px 40px;
        transform: translateX(100%);
        transition: transform 0.3s ease-in-out;
        overflow-y: auto;
        justify-content: flex-start;
        align-items: center;
    }

    .header__nav.active {
        transform: translateX(0);
    }

    .nav__list {
        flex-direction: column;
        align-items: center;
        gap: 30px;
        font-size: 22px;
        font-weight: 600;
    }

    .header__contacts--mobile {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 20px;
        margin-top: 40px;
    }

    .hero__container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero__content {
        order: 2;
    }

    .hero__image {
        order: 1;
    }

    .hero__title {
        font-size: 36px;
    }

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

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

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

@media (max-width: 768px) {

    .problems__grid,
    .tech-specs__grid,
    .raw-materials__list {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 640px) {

    .usage__grid,
    .footer__grid {
        grid-template-columns: 1fr;
    }

    .promo__card {
        padding: 30px;
    }
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 11, 29, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    backdrop-filter: blur(5px);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal__content {
    background: linear-gradient(135deg, var(--color-bg-primary) 0%, #001A4D 100%);
    padding: 50px;
    border-radius: 2000px;
    /* Error in my thought, fixing to 20px */
    border-radius: 20px;
    max-width: 500px;
    width: 90%;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.modal__close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    color: white;
    font-size: 30px;
    cursor: pointer;
}

.modal__title {
    font-size: 28px;
    margin-bottom: 15px;
    text-align: center;
}

.modal__subtitle {
    text-align: center;
    color: var(--color-text-secondary);
    margin-bottom: 30px;
    font-size: 14px;
}

/* Notification */
.notification {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--color-white);
    color: var(--color-text-dark);
    padding: 20px 30px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    z-index: 3000;
    transform: translateX(200%);
    transition: transform 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.notification.active {
    transform: translateX(0);
}

.notification__content {
    display: flex;
    align-items: center;
    gap: 15px;
}

.notification__icon {
    font-size: 24px;
}

.notification__text {
    font-weight: 600;
}