:root {
    --crimson: #990000;
    --crimson-light: #cc0000;
    --crimson-dark: #660000;
    --crimson-velvet: #8B0000;
    --black: #121212;
    --black-light: #1e1e1e;
    --gray: #2d2d2d;
    --gray-light: #444;
    --text-light: #f0f0f0;
    --text-muted: #aaa;
    --app-green: #4CAF50;
    --app-dark: #212121;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--black);
    color: var(--text-light);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4 {
    font-family: 'Playfair Display', serif;
    font-weight: 600;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

section {
    padding: 100px 0;
    position: relative;
}

/* Шапка */
header {
    background-color: rgba(18, 18, 18, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    z-index: 1000;
    padding: 20px 0;
    border-bottom: 1px solid var(--crimson-velvet);
}

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

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-light);
    font-family: 'Playfair Display', serif;
}

    .logo span {
        color: var(--crimson-velvet);
    }

.nav-links {
    display: flex;
    gap: 30px;
}

    .nav-links a {
        color: var(--text-light);
        text-decoration: none;
        font-weight: 500;
        transition: color 0.3s;
        position: relative;
    }

        .nav-links a::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: -5px;
            left: 0;
            background-color: var(--crimson-velvet);
            transition: width 0.3s;
        }

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

        .nav-links a:hover {
            color: var(--crimson-light);
        }

.cta-button {
    background-color: var(--crimson-velvet);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    font-family: 'Inter', sans-serif;
}

    .cta-button:hover {
        background-color: var(--crimson-light);
        transform: translateY(-2px);
        box-shadow: 0 5px 15px rgba(153, 0, 0, 0.3);
    }

/* Начальная секция */
.intro {
    padding: 180px 0 100px;
    background: linear-gradient(135deg, var(--black) 0%, var(--black-light) 100%);
    position: relative;
    overflow: hidden;
}

    .intro::before {
        content: '';
        position: absolute;
        top: -50%;
        right: -50%;
        width: 100%;
        height: 200%;
        background: radial-gradient(circle, var(--crimson-dark) 0%, transparent 70%);
        opacity: 0.05;
        z-index: 0;
    }

.intro-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.intro h1 {
    font-size: 4rem;
    margin-bottom: 30px;
    line-height: 1.2;
    background: linear-gradient(90deg, var(--crimson-velvet), var(--crimson-light));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    animation: fadeInUp 1s ease-out;
}

.intro-text {
    font-size: 1.3rem;
    margin-bottom: 30px;
    color: var(--text-muted);
    animation: fadeInUp 1s ease-out 0.3s both;
}

    .intro-text p {
        margin-bottom: 20px;
    }

/* секция с контентом */
.content-section {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s, transform 0.8s;
}

    .content-section.visible {
        opacity: 1;
        transform: translateY(0);
    }

.section-title {
    text-align: center;
    margin-bottom: 80px;
    position: relative;
}

    .section-title h2 {
        font-size: 3rem;
        margin-bottom: 20px;
        position: relative;
        display: inline-block;
    }

        .section-title h2::after {
            content: '';
            position: absolute;
            width: 100%;
            height: 3px;
            bottom: -10px;
            left: 0;
            background: linear-gradient(90deg, var(--crimson-velvet), transparent);
        }

    .section-title p {
        color: var(--text-muted);
        max-width: 700px;
        margin: 30px auto 0;
        font-size: 1.2rem;
    }

.content-block {
    display: flex;
    align-items: center;
    gap: 60px;
    margin-bottom: 120px;
}

    .content-block.reverse {
        flex-direction: row-reverse;
    }

.text-content {
    flex: 1;
}

    .text-content h3 {
        font-size: 2.2rem;
        margin-bottom: 25px;
        color: var(--crimson-light);
    }

    .text-content p {
        font-size: 1.2rem;
        color: var(--text-muted);
        margin-bottom: 25px;
        line-height: 1.8;
    }

.visual-content {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* макет приложения */
.app-mockup {
    width: 320px;
    height: 650px;
    background-color: var(--app-dark);
    border-radius: 40px;
    position: relative;
    border: 12px solid var(--black);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
    overflow: hidden;
}

.app-screen {
    width: 100%;
    height: 100%;
    background-color: var(--app-dark);
    border-radius: 28px;
    padding: 20px;
    position: relative;
    overflow: hidden;
}

.app-notch {
    width: 60%;
    height: 25px;
    background-color: var(--black);
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    border-bottom-left-radius: 15px;
    border-bottom-right-radius: 15px;
    z-index: 2;
}

.app-header {
    color: var(--app-green);
    font-weight: 700;
    margin-bottom: 20px;
    font-size: 1.3rem;
    padding-top: 10px;
    font-family: 'Inter', sans-serif;
}

.app-item {
    background-color: #2d2d2d;
    padding: 12px 15px;
    border-radius: 10px;
    margin-bottom: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-left: 4px solid var(--app-green);
    font-family: 'Inter', sans-serif;
}

    .app-item.completed {
        opacity: 0.7;
        border-left-color: #666;
    }

        .app-item.completed .item-text {
            text-decoration: line-through;
            color: #888;
        }

.app-checkbox {
    width: 20px;
    height: 20px;
    border-radius: 4px;
    background-color: #444;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 12px;
}

    .app-checkbox.checked {
        background-color: var(--app-green);
    }

        .app-checkbox.checked::after {
            content: '✓';
            color: white;
            font-size: 0.9rem;
        }

.item-content {
    display: flex;
    align-items: center;
    flex: 1;
}

.item-text {
    color: #f0f0f0;
}

.item-count {
    color: #aaa;
    font-size: 0.9rem;
}

.app-tab {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: #1a1a1a;
    padding: 15px;
    border-top: 1px solid #444;
    display: flex;
    justify-content: space-around;
}

.tab-item {
    color: #aaa;
    font-size: 0.9rem;
    text-align: center;
}

    .tab-item.active {
        color: var(--app-green);
    }

/* Секция со скринами */
.screenshots-section {
    background-color: var(--black-light);
}

.screenshots-container {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 60px;
    flex-wrap: wrap;
}

.screenshot-wrapper {
    perspective: 1000px;
}

.screenshot-card {
    width: 280px;
    height: 550px;
    background-color: var(--app-dark);
    border-radius: 30px;
    padding: 25px;
    border: 10px solid var(--black);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    transform-style: preserve-3d;
    transition: transform 0.8s;
    position: relative;
    overflow: hidden;
}

    .screenshot-card:hover {
        transform: rotateY(10deg) rotateX(5deg);
    }

.screenshot-header {
    color: var(--app-green);
    font-weight: 700;
    margin-bottom: 20px;
    font-size: 1.2rem;
    font-family: 'Inter', sans-serif;
}

.screenshot-content {
    height: calc(100% - 40px);
    overflow-y: auto;
    padding-right: 5px;
}

    .screenshot-content::-webkit-scrollbar {
        width: 4px;
    }

    .screenshot-content::-webkit-scrollbar-thumb {
        background-color: var(--app-green);
        border-radius: 2px;
    }

.screenshot-filename {
    position: absolute;
    bottom: 15px;
    left: 0;
    width: 100%;
    text-align: center;
    color: var(--crimson-light);
    font-size: 0.9rem;
    font-family: monospace;
}

/* Principles Section */
.principles-section {
    background: linear-gradient(135deg, var(--black) 0%, var(--black-light) 100%);
}

.principles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.principle-card {
    background-color: var(--gray);
    border-radius: 16px;
    padding: 40px 30px;
    text-align: center;
    border: 1px solid var(--gray-light);
    transition: all 0.4s;
    position: relative;
    overflow: hidden;
}

    .principle-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 5px;
        background: linear-gradient(90deg, var(--crimson-velvet), var(--crimson-light));
    }

    .principle-card:hover {
        transform: translateY(-10px);
        box-shadow: 0 20px 40px rgba(153, 0, 0, 0.2);
        border-color: var(--crimson-velvet);
    }

.principle-icon {
    width: 80px;
    height: 80px;
    background-color: rgba(153, 0, 0, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
}

    .principle-icon i {
        font-size: 2.5rem;
        color: var(--crimson-light);
    }

.principle-card h3 {
    font-size: 1.6rem;
    margin-bottom: 15px;
    color: var(--text-light);
}

.principle-card p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

/* Крайняя секция */
.conclusion {
    padding: 120px 0;
    background-color: var(--black);
    text-align: center;
    position: relative;
}

    .conclusion::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 1px;
        background: linear-gradient(90deg, transparent, var(--crimson-velvet), transparent);
    }

.conclusion-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.conclusion h2 {
    font-size: 3rem;
    margin-bottom: 40px;
    color: var(--crimson-light);
}

.conclusion-text {
    font-size: 1.3rem;
    color: var(--text-muted);
    margin-bottom: 40px;
    line-height: 1.8;
}

    .conclusion-text p {
        margin-bottom: 25px;
    }

/* Подвал */
footer {
    background-color: var(--black);
    padding: 60px 0 30px;
    border-top: 1px solid var(--gray);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 15px;
    font-family: 'Playfair Display', serif;
}

    .footer-logo span {
        color: var(--crimson-velvet);
    }

.footer-about p {
    color: var(--text-muted);
    max-width: 300px;
}

.footer-links h4 {
    margin-bottom: 20px;
    font-size: 1.2rem;
    color: var(--text-light);
}

.footer-links ul {
    list-style-type: none;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.3s;
}

    .footer-links a:hover {
        color: var(--crimson-light);
    }

.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--gray-light);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Анимации */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Адаптивность */
@media (max-width: 992px) {
    .content-block {
        flex-direction: column;
        gap: 40px;
    }

    .intro h1 {
        font-size: 3rem;
    }

    .section-title h2 {
        font-size: 2.5rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .intro h1 {
        font-size: 2.5rem;
    }

    .section-title h2 {
        font-size: 2rem;
    }

    .text-content h3 {
        font-size: 1.8rem;
    }

    .app-mockup, .screenshot-card {
        width: 280px;
        height: 580px;
    }
}

@media (max-width: 576px) {
    section {
        padding: 70px 0;
    }

    .intro {
        padding: 150px 0 70px;
    }
}