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

:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --error-color: #ef4444;
    --background-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --card-background: rgba(255, 255, 255, 0.95);
    --text-color: #1f2937;
    --border-color: #e5e7eb;
    --shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--background-gradient);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

/* Основной контейнер */
.center-container {
    width: 100%;
    max-width: 700px;
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Карточка регистрации */
.registration-card {
    background: var(--card-background);
    padding: 3rem;
    border-radius: 20px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.sign-card {
    background: var(--card-background);
    padding: 3rem;
    border-radius: 20px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);

}

/* Карточка контента главной страницы*/
.content-card {
    background: var(--card-background);
    padding: 3rem;
    border-radius: 20px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Заголовок */
.form-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.form-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.form-header h1 {
    color: var(--primary-color);
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.form-subtitle {
    color: #6b7280;
    font-size: 1rem;
}

/* Форма */
.registration-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.sign-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Группы полей */
.form-group {
    display: flex;
    flex-direction: column;
    justify-content: space-between;

}

.form-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-color);
    font-size: 0.9rem;
}

.label-icon {
    font-size: 1.1rem;
}

.form-input {
    padding: 1rem 1.2rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.8);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    background: white;
    transform: translateY(-2px);
}

.form-input::placeholder {
    color: #9ca3af;
}

/* Кнопка отправки */
.submit-registration-btn,
.submit-sign-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 1.2rem;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 1rem;
    position: relative;
    overflow: hidden;
}

.submit-registration-btn:hover,
.submit-sign-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(99, 102, 241, 0.3);
}

.submit-registration-btn:active,
.submit-sign-btn:active {
    transform: translateY(-1px);
}



/* Сообщения об ошибках */
.error-message {
    background: var(--error-color);
    color: white;
    padding: 1rem;
    border-radius: 10px;
    text-align: center;
    margin-top: 1rem;
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* Успешная регистрация */
.success-container {
    text-align: center;
}

.success-icon {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    animation: bounce 1s ease-in-out;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

.success-container h2 {
    color: var(--success-color);
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
}

.user-info {
    background: rgba(16, 185, 129, 0.1);
    padding: 1.5rem;
    border-radius: 12px;
    margin: 2rem 0;
    border-left: 4px solid var(--success-color);
}

.user-detail {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.user-detail:last-child {
    border-bottom: none;
}

.detail-label {
    font-weight: 600;
    color: var(--text-color);
}

.detail-value {
    color: var(--text-color);
    font-weight: 500;
}

.action-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn {
    padding: 0.8rem 1.5rem;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    display: inline-block;
}

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

.btn-secondary {
    background: #6b7280;
    color: white;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

/* Адаптивность */
@media (max-width: 768px) {
    body {
        padding: 15px;
    }

    .registration-card {
        padding: 2rem;
    }

    .form-header h1 {
        font-size: 1.5rem;
    }

    .action-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }
}

.form-row {
    display: flex;
    gap: 15px;
}

.form-row .form-group {
    flex: 1;
}


.index-header {
    width: 100%;
    background: var(--card-background);
    box-shadow: var(--shadow);
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    animation: fadeInDown 0.6s ease-out;
}


.home-header {
    width: 100%;
    background: var(--card-background);
    box-shadow: var(--shadow);
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    animation: fadeInDown 0.6s ease-out;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.header-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.header-home-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: flex-end;
}

/* Навигация в шапке */
.main-nav {
    display: flex;
    gap: 1rem;
}


.name-title {
    color: #6b7280;
    font-size: 1rem;
}

/* Ссылки в шапке */
.btn-head-text {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    padding: 0.6rem 1.2rem;
    border: 2px solid var(--primary-color);
    border-radius: 10px;
    transition: all 0.3s ease;
    background: white;
}

/* Эффект наведения */
.btn-head-text:hover {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: 0 5px 15px rgba(99, 102, 241, 0.3);
    transform: translateY(-2px);
}

/* При нажатии */
.btn-head-text:active {
    transform: translateY(0);
    box-shadow: none;
}

/* Адаптивность */
@media (max-width: 768px) {
    .header-container {
        justify-content: center;
        padding: 0.8rem 1rem;
    }

    .main-nav {
        flex-direction: column;
        align-items: center;
        gap: 0.8rem;
    }

    .btn-head-text {
        width: 100%;
        text-align: center;
    }
}

.error-message {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #dc2626;
    padding: 12px 16px;
    border-radius: 6px;
    margin: 1rem 0;
    display: none;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}




.home-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}


.head-main{
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}


img {
    width: 100%;         /* занимает всю ширину родительского блока */
    height: auto;        /* сохраняет пропорции */
    max-height: 500px;   /* ограничение по высоте */
    object-fit: cover;   /* аккуратно обрезает, если картинка выше */
    display: block;      /* убирает отступ снизу */
}


.main-nav {
    padding: 20px;
    display: flex;
    justify-content: flex-start;
    align-items: center;
}


.btn-head-user-text {
    display: inline-block;
    padding: 12px 24px;
    background-color: #6c757d; /* серый цвет кнопки */
    color: #ffffff; /* белый текст */
    text-decoration: none;
    font-weight: 600;
    font-family: Arial, sans-serif;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn-head-user-text:hover {
    background-color: #5a6268; /* немного темнее при наведении */
}

.create-room {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: 1rem;
}


.connect-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.connect-read {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}


/* окно комнаты */

.center-container {
    width: 100%;
    max-width: 30px;
    animation: fadeInUp 0.8s ease-out;
}



.key-card {
    background: var(--card-background);
    padding: 2rem 2.5rem;
    border-radius: 16px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    text-align: center;
    margin-top: 1.5rem;
    animation: fadeInUp 0.8s ease-out;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.key-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 25px 45px rgba(0, 0, 0, 0.15);
}

.key-card h2 {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.key-card p {
    color: var(--text-color);
    font-size: 1rem;
    line-height: 1.6;
}