/* ===== RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    color-scheme: light;
}

body {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
    line-height: 1.5;
    background: var(--color-bg);
    color: var(--color-fg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== CSS VARIABLES ===== */
:root {
    /* Colors */
    --color-bg: #fff;
    --color-fg: #0b0b0b;
    --color-muted: #666;
    --color-primary: #0a84ff;
    --color-danger: #b00020;
    --color-text-red: rgb(220, 21, 21);
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 1rem;
    --space-4: 1.5rem;
    --space-5: 2.5rem;
    --space-6: 4rem;
    
    /* Typography */
    --font-body: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
    
    /* Borders & Shadows */
    --radius: 12px;
    --shadow: 0 1px 2px rgba(0, 0, 0, .08), 0 8px 24px rgba(0, 0, 0, .08);
    
    /* Container */
    --container-width: min(100% - 2 * var(--space-4), 1120px);
}

/* Dark theme */
body.theme-dark {
    --color-bg: #0b0b0b;
    --color-fg: #f5f5f5;
    --color-muted: #aaa;
    --color-primary: #6aa2ff;
    color-scheme: dark;
}

/* ===== LAYOUT COMPONENTS ===== */
.container {
    width: var(--container-width);
    margin-inline: auto;
    padding-inline: var(--space-3);
}

/* Header */
.header {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-muted);
    padding: var(--space-3) 0;
}


.container {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
    color: var(--color-fg);
}

/* Navigation */
.nav__list {
    display: flex;
    list-style: none;
    gap: var(--space-4);
}

.nav__link {
    color: var(--color-fg);
    text-decoration: none;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius);
    transition: background-color 0.2s ease;
}

.nav__link:hover,
.nav__link--active {
    background-color: var(--color-primary);
    color: white;
}

/* Main content */
.main {
    flex: 1;
    padding: var(--space-5) 0;
}

/* Sections */
.section {
    padding: var(--space-5) 0;
}

.section__title {
    margin-bottom: var(--space-3);
    font-size: 2rem;
}

/* Hero section */
.hero {
    text-align: center;
    padding: var(--space-6) 0;
}

.hero__title {
    font-size: 2.5rem;
    margin-bottom: var(--space-4);
}

.hero__image {
    margin: var(--space-4) auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

/* Media container */
.media {
    aspect-ratio: 16/9;
    width: min(100%, 960px);
    margin: var(--space-5) auto;
}

.media iframe {
    width: 100%;
    height: 100%;
    border: 0;
    border-radius: var(--radius);
}

/* Buttons */
.button {
    display: inline-block;
    padding: var(--space-2) var(--space-4);
    background: var(--color-primary);
    color: white;
    text-decoration: none;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: filter 0.2s ease;
}

.button:hover {
    filter: brightness(0.95);
}

.theme-toggle {
    margin: var(--space-3) 0;
    padding: var(--space-2) var(--space-4);
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
}

/* Content example */
.content-example {
    margin: var(--space-5) 0;
}

.color-text {
    color: var(--color-text-red);
    font-size: large;
    font-weight: bold;
    margin-bottom: var(--space-2);
}

#new-st {
    color: var(--color-primary);
}

/* Footer */
.footer {
    background: var(--color-bg);
    border-top: 1px solid var(--color-muted);
    padding: var(--space-4) 0;
    text-align: center;
}

/* ===== FORM STYLES ===== */
label {
    display: block;
    margin: var(--space-2) 0 var(--space-1);
}

input,
select,
textarea,
button {
    width: 100%;
    max-width: 480px;
    padding: var(--space-2) var(--space-3);
    border: 1px solid #c8c8c8;
    border-radius: var(--radius);
    background: var(--color-bg);
    font: inherit;
    color: inherit;
}

button,
[type="submit"] {
    background: var(--color-primary);
    color: white;
    border: none;
    cursor: pointer;
}

/* Focus states */
:where(a, button, input, select, textarea):focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Disabled states */
:disabled,
[aria-disabled="true"] {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Invalid fields */
[aria-invalid="true"] {
    border-color: var(--color-danger);
}

/* Target highlighting */
:target {
    outline: 2px dashed var(--color-primary);
    outline-offset: var(--space-2);
}

/* ===== UTILITY CLASSES ===== */
.submit,
.close {
    margin-top: var(--space-3);
}

/* ===== IMAGE & MEDIA DEFAULTS ===== */
img,
video {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: var(--space-3);
    }
    
    .nav__list {
        flex-direction: column;
        gap: var(--space-2);
        text-align: center;
    }
    
    .hero__title {
        font-size: 2rem;
    }
    
    .section__title {
        font-size: 1.5rem;
    }
}






.container_header{
    padding-left: 20px;
    padding-right: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}


.main{
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.reg_div{
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.close{
    margin-bottom: 10px;
}

.submut{
    margin-bottom: 10px;
}