/* =========================================
   1. CSS Reset & Base Styles
   ========================================= */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Цветовая палитра (Dark Theme 1win style) */
    --c-primary: #1e88e5; /* Яркий синий */
    --c-primary-hover: #1565c0;
    --c-secondary: #00e676; /* Акцентный зеленый для промо */
    --c-bg-body: #0f1923; /* Глубокий темный фон */
    --c-bg-card: #1b2636; /* Чуть светлее для блоков */
    --c-text-main: #ffffff;
    --c-text-muted: #b0bec5;
    --c-border: rgba(255, 255, 255, 0.1);
    
    /* Типографика */
    --font-main: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    --fw-regular: 400;
    --fw-bold: 700;
    
    /* Размеры и отступы */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    
    /* Эффекты */
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 10px 20px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 15px rgba(30, 136, 229, 0.5);
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    height: 100%;
}

body {
    font-family: var(--font-main);
    background-color: var(--c-bg-body);
    color: var(--c-text-main);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100%;
}

/* =========================================
   2. Utility Classes & Layout
   ========================================= */
.container {
    width: 100%;
    max-width: 75rem; /* 1200px */
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

.text-center {
    text-align: center;
}

.row-center {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

/* =========================================
   3. Header & Mobile Menu
   ========================================= */
.line-menu-mobile {
    background: var(--c-bg-card);
    border-bottom: 1px solid var(--c-border);
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.line-menu-mobile .row-center {
    justify-content: flex-end;
    gap: var(--spacing-sm);
}

.landing-header-right-login,
.landing-header-right-reg {
    font-size: 0.9rem;
    font-weight: var(--fw-bold);
    padding: 0.5rem 1.25rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    user-select: none;
}

.landing-header-right-login {
    background: transparent;
    border: 1px solid var(--c-primary);
    color: var(--c-primary);
}

.landing-header-right-login:hover {
    background: rgba(30, 136, 229, 0.1);
    box-shadow: 0 0 10px rgba(30, 136, 229, 0.2);
}

.landing-header-right-reg {
    background: linear-gradient(135deg, var(--c-primary), var(--c-primary-hover));
    color: #fff;
    box-shadow: var(--shadow-sm);
}

.landing-header-right-reg:hover {
    filter: brightness(1.1);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

/* =========================================
   4. Hero Section (Header Box)
   ========================================= */
.header-box {
    background: radial-gradient(circle at top center, #263548 0%, var(--c-bg-body) 70%);
    padding: var(--spacing-lg) 0;
    display: flex;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

/* Эффект свечения на фоне */
.header-box::before {
    content: '';
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(30, 136, 229, 0.15) 0%, transparent 70%);
    pointer-events: none;
}

.header-box .table {
    display: flex;
    justify-content: center;
    width: 100%;
    z-index: 1;
}

.ctr {
    width: 100%;
    max-width: 50rem;
    animation: fadeIn 0.8s ease-out;
}

h1 {
    font-size: clamp(2rem, 5vw, 4rem);
    text-align: center;
    font-weight: 900;
    text-transform: uppercase;
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
    background: linear-gradient(to right, #fff, #90caf9);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 10px 20px rgba(0,0,0,0.5);
}

.text-head {
    font-size: 1.2rem;
    color: var(--c-text-muted);
    margin-bottom: var(--spacing-md);
}

.text-head b {
    color: #fff;
    font-weight: var(--fw-bold);
}

/* Промокод стиль */
.promo {
    display: inline-block;
    background: rgba(0, 230, 118, 0.1);
    color: var(--c-secondary);
    border: 1px dashed var(--c-secondary);
    padding: 0.2rem 0.8rem;
    border-radius: var(--radius-sm);
    font-family: monospace;
    font-size: 1.3em;
    font-weight: var(--fw-bold);
    cursor: pointer;
    position: relative;
    transition: var(--transition);
}

.promo:hover {
    background: var(--c-secondary);
    color: #000;
    box-shadow: 0 0 15px rgba(0, 230, 118, 0.4);
}

.promo:active {
    transform: scale(0.95);
}

/* Tooltip для копирования */
.promo::after {
    content: 'Click to copy';
    position: absolute;
    bottom: 110%;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.75rem;
    background: #000;
    color: #fff;
    padding: 0.2rem 0.5rem;
    border-radius: 0.25rem;
    opacity: 0;
    transition: opacity 0.2s;
    pointer-events: none;
    white-space: nowrap;
    font-family: var(--font-main);
}
.promo:hover::after {
    opacity: 1;
}

.inform-promo {
    font-size: 0.9rem;
    color: var(--c-text-muted);
    margin-top: var(--spacing-xs);
    font-style: italic;
}

/* =========================================
   5. Buttons
   ========================================= */
.button {
    display: inline-block;
    background: linear-gradient(90deg, var(--c-primary), #42a5f5);
    color: #fff;
    font-size: 1.2rem;
    font-weight: var(--fw-bold);
    padding: 1rem 3rem;
    border-radius: var(--radius-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: none;
    user-select: none;
    text-decoration: none;
}

.button:hover {
    transform: translateY(-4px);
    box-shadow: 0 15px 30px rgba(30, 136, 229, 0.4);
    filter: brightness(1.1);
}

.button:active {
    transform: translateY(-1px);
    box-shadow: 0 5px 15px rgba(30, 136, 229, 0.3);
}

/* =========================================
   6. Main Content
   ========================================= */
.content {
    padding: var(--spacing-lg) 0;
}

.col-xs-12 {
    width: 100%;
    max-width: 50rem; /* Оптимальная ширина для чтения */
    margin: 0 auto;
}

/* Типографика контента */
h2 {
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    color: var(--c-text-main);
    margin: var(--spacing-lg) 0 var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--c-primary);
    display: inline-block;
}

p {
    margin-bottom: 1.2rem;
    color: var(--c-text-muted);
    font-size: 1.1rem;
    text-align: justify;
}

ul {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
    list-style: none;
}

ul li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.8rem;
    color: var(--c-text-muted);
}

ul li::before {
    content: '➤';
    position: absolute;
    left: 0;
    color: var(--c-primary);
    font-size: 0.9em;
}

/* Изображения */
.img {
    margin: var(--spacing-md) 0;
    text-align: center;
}

.img img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    opacity: 0; /* Для lazyload анимации */
    animation: fadeInImg 1s forwards;
    border: 1px solid var(--c-border);
}

.img img:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-glow);
}

/* =========================================
   7. Form/Interactive Elements Styling
   ========================================= */
/* Если появятся реальные формы */
input[type="text"], 
input[type="email"], 
input[type="password"] {
    width: 100%;
    padding: 1rem;
    margin-bottom: 1rem;
    background: var(--c-bg-card);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-sm);
    color: #fff;
    outline: none;
    transition: var(--transition);
}

input:focus {
    border-color: var(--c-primary);
    box-shadow: 0 0 0 3px rgba(30, 136, 229, 0.2);
}

/* =========================================
   8. Animations
   ========================================= */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInImg {
    to { opacity: 1; }
}

/* =========================================
   9. Responsive Design
   ========================================= */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 2.5rem;
    }

    .line-menu-mobile .row-center {
        justify-content: space-between;
    }

    h1 {
        font-size: 2rem;
    }

    .button {
        width: 100%;
        padding: 1rem;
    }

    .landing-header-right-login, 
    .landing-header-right-reg {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
    
    p {
        text-align: left;
    }
}