html, body {
    height: 100%;
    min-height: 100dvh;
    overflow: hidden;
}

body {
    height: 100dvh;
    overflow: hidden;
    margin: 0;
    font-family: Lato, Tahoma, sans-serif;
    background-color: var(--black);
    color: var(--white);
    display: flex;
    flex-flow: column nowrap;
    align-items: center;
    justify-content: space-between;

    /* Учет безопасных зон */
    padding-top: env(safe-area-inset-top);
    padding-bottom: env(safe-area-inset-bottom);
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);

    & .presentation-container {
        width: 100%;
        max-width: 1200px;
        height: 100%;
        overflow: hidden;
        display: flex;
        flex-flow: column nowrap;
        align-items: center;
        justify-content: space-between;
        padding-inline: 0.5rem;
    }
}

header {
    flex-shrink: 0;
    width: 100%;
    display: flex;
    flex-flow: row nowrap;
    justify-content: space-between;
    align-items: center;
    column-gap: 2rem;
    padding: max(1rem, env(safe-area-inset-top)) 0;
    border-bottom: 1px solid var(--graphite);

    & .header__main-content {
        display: flex;
        flex-flow: column nowrap;
        align-items: flex-start;
        justify-content: flex-start;
        row-gap: 0.5rem;

        & .header__title {
            display: flex;
            flex-flow: row wrap;
            justify-content: center;
            align-items: center;
            column-gap: 1rem;

            > h1 {
                font-size: 1.6rem;
                font-weight: 800;
            }

            > h2 {
                font-size: 1.1rem;
                font-weight: 400;
            }
        }

        & .header__controls-tools {
            display: flex;
            flex-flow: row wrap;
            justify-content: flex-start;
            align-items: center;
            column-gap: 1rem;
            row-gap: 0.5rem;
            white-space: nowrap;

            & .manual-container {
                display: flex;
                flex-flow: row nowrap;
                justify-content: center;
                align-items: center;
                column-gap: 0.5rem;
                border: 1px solid var(--graphite);
                border-radius: 0.6rem;
                padding: 0.2rem 1.2rem;

                & .slider-controls {
                    display: flex;
                    flex-flow: row nowrap;
                    justify-content: center;
                    align-items: center;
                    column-gap: 0.4rem;
                    
                    & .manual-btn {
                        display: flex;
                        flex-flow: row nowrap;
                        justify-content: center;
                        align-items: center;
                        column-gap: 0.5rem;
                        border: 1px solid var(--graphite);
                        border-radius: 0.6rem;
                        padding: 0.6rem 1.0rem; 
                        font-weight: 400;  
                        background-color: rgba(255, 255, 255, 0.15); 
                        cursor: pointer;
                        transition: all 0.2s;

                        &:hover {
                            background: linear-gradient(135deg, var(--grey) 0%, var(--blackout) 100%);
                            color: var(--black);
                        }
                    }
                }
            }

            & .control-btn {             
                display: flex;
                flex-flow: row nowrap;
                justify-content: center;
                align-items: center;
                column-gap: 0.5rem;
                border: 1px solid var(--graphite);
                border-radius: 0.6rem;
                padding: 0.8rem 1.2rem; 
                background-color: rgba(255, 255, 255, 0.1);  
                cursor: pointer;
                transition: all 0.2s;

                &:hover {
                    background: linear-gradient(135deg, var(--grey) 0%, var(--blackout) 100%);
                    color: var(--black);
                }
            }

            & .btn-active {
                background: linear-gradient(135deg, var(--graphite) 0%, var(--blackout) 100%);
            }           
        }
    }

    & .action-btn {
        display: flex;
        flex-flow: row nowrap;
        justify-content: center;
        align-items: center;
        font-size: 1.0rem;
        font-weight: 800;
        text-transform: uppercase;
        background-color: rgba(255, 255, 255, 0.2);
        border: 1px solid var(--graphite);
        border-radius: 0.6rem;
        padding: 0.8rem 1.2rem;   
        cursor: pointer;
        transition: all 0.2s;

        &:hover {
            background: linear-gradient(135deg, var(--grey) 0%, var(--blackout) 100%);
            color: var(--black);
        }
    }

    @media (max-width: 1200px) {
        & .header__main-content {    
            & .header__title {    
                > h1 { font-size: 1.5rem; }    
                > h2 { font-size: 1.0rem; }
            }

            & .header__controls-tools {    
                & .manual-container {    
                    padding: 0.2rem 0.8rem;
                    & .slider-controls {                       
                        & .manual-btn {
                            padding: 0.5rem 0.8rem;
                        }
                    }
                }

                & .control-btn {             
                    padding: 0.7rem 0.6rem;
                }
            }            
        }
    }

    @media (max-width: 900px) {
        column-gap: 1rem;
        
        & .header__main-content {    
            & .header__title { 
                column-gap: 0.6rem;   
                > h1 { font-size: 1.40rem; }    
                > h2 { font-size: 0.9rem; }
            }

            & .header__controls-tools {    
                & .manual-container { font-size: 0.9rem; }

                & .control-btn {             
                    font-size: 0.9rem;
                }
            }    
        }
    }

    @media (max-width: 767px) {
        font-size: 2rem;

        & .action-btn {
            font-size: 0.9rem;
            padding: 0.6rem 0.9rem;
        }
    }

    @media (max-width: 575px) {
        & .header__main-content {    
            & .header__title {    
                > h2 { display: none;}   
            }
        }

        & .header__controls-tools {    
            & .manual-container { 
                > :first-child { display: none; }
            }
        }   
    }

    @media (max-width: 479px) {
        & .header__controls-tools {    
            & .manual-container { 
                padding: 0.2rem 0.5rem !important;
                & .slider-controls {                       
                    & .manual-btn { padding: 0.4rem 0.8rem; }
                }
            }
        }   

        & .action-btn { display: none; }
    }
}


footer {
    flex-shrink: 0;
    width: 100%;
    display: flex;
    flex-flow: row nowrap;
    justify-content: space-between;
    align-items: center;
    column-gap: 2rem;
    padding: 1rem 0 max(1rem, env(safe-area-inset-bottom));
    border-top: 1px solid var(--graphite);

    > .page-dots {
        display: flex;
        gap: 0.6rem;

        .dot {
            width: 0.75rem;
            height: 0.75rem;
            border-radius: 1rem;
            background: var(--white);
            transition: 0.2s;
            cursor: pointer;
            border: none;
            position: relative;

             /* Кастомный tooltip */
            &::before {
                content: attr(data-tooltip);
                position: absolute;
                bottom: 100%;
                left: -0.4rem;
                margin-bottom: 0.65rem;
                padding: 0.25rem 0.5rem;
                background-color: var(--graphite);
                color: var(--white);
                font-size: 0.7rem;
                font-family: PTSans-Regular, Tahoma, sans-serif;
                white-space: nowrap;
                border-radius: 0.25rem;
                opacity: 0;
                visibility: hidden;
                transition: opacity 0.2s, visibility 0.2s;
                pointer-events: none;
                z-index: 10;
            }
            
            /* Маленькая стрелочка под подсказкой */
            &::after {
                content: '';
                position: absolute;
                bottom: 100%;
                left: 50%;
                transform: translateX(-50%);
                margin-bottom: 0.125rem;
                border: 5px solid transparent;
                border-top-color: var(--graphite);
                opacity: 0;
                visibility: hidden;
                transition: opacity 0.2s, visibility 0.2s;
                pointer-events: none;
            }

            &:hover {
                background: var(--grey);
            }

            &:hover::before,
            &:hover::after {
                opacity: 1;
                visibility: visible;
            }
        }
       
        .dot.active {
            background: var(--graphite);
            width: 2rem;

            &:hover {
                background: var(--grey);
            }
        }
    }

   
    > .footer-right {
        display: flex;
        align-items: center;
        gap: 1rem;

        > .autoplay-indicator {
            color: var(--grey);
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }

        > .theme-switcher {
            position: relative;

            > .theme-btn {                                              
                width: 1rem;
                aspect-ratio: 1 / 1;
                color: var(--grey); 
                background-color: currentColor;
                mask-image: url('../img/icons/theme.svg');
                mask-size: contain;
                mask-repeat: no-repeat;
                mask-position: center;
                -webkit-mask-image: url('../img/icons/theme.svg');
                -webkit-mask-size: contain;
                -webkit-mask-repeat: no-repeat;
                -webkit-mask-position: center;
                cursor: pointer;
                transition: all 0.3s;

                &:hover {
                    color: var(--white);
                }
            }

            > .theme-tooltip {
                position: absolute;
                bottom: 100%;
                right: 0;
                margin-bottom: 0.8rem;
                background-color: var(--black);
                border: 1px solid var(--graphite);
                border-radius: 0.8rem;
                padding: 1rem;
                min-width: 200px;
                opacity: 0;
                visibility: hidden;
                transform: translateY(10px);
                transition: all 0.2s ease;
                z-index: 100;

                &::after {
                    content: '';
                    position: absolute;
                    bottom: -0.375rem;
                    right: 0.75rem;
                    width: 0.75rem;
                    height: 0.75rem;
                    background-color: var(--black);
                    border-right: 1px solid var(--graphite);
                    border-bottom: 1px solid var(--graphite);
                    transform: rotate(45deg);
                }

                > h4 {
                    font-size: 0.85rem;
                    margin-bottom: 0.8rem;
                    text-align: center;
                    color: var(--grey);
                }

                > .theme-options {
                    display: flex;
                    flex-direction: column;
                    gap: 0.6rem;

                    > .theme-option {
                        display: flex;
                        align-items: center;
                        gap: 0.8rem;
                        cursor: pointer;
                        font-size: 0.85rem;
                        padding: 0.4rem 0.6rem;
                        border-radius: 0.4rem;
                        transition: background 0.3s;

                        &:hover {
                            background-color: rgba(255, 255, 255, 0.1);
                        }

                        > input {
                            margin: 0;
                            cursor: pointer;
                            accent-color: var(--graphite);
                        }
                    }
                }
            }

            &.active .theme-tooltip {
                opacity: 1;
                visibility: visible;
                transform: translateY(0);
            }
        }

    }

     /* Адаптация для мобильных устройств (на тач-устройствах подсказки не показываем) */
     @media (hover: none) and (pointer: coarse) {
        .page-dots .dot::before,
        .page-dots .dot::after {
            display: none;
        }
    }

    @media (max-width: 575px) {
        > .footer-right {
            > .autoplay-indicator { display: none; }
        }
    }
}


/* Анимированный спиннер лоадера загрузки */
.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    min-height: 400px;
    width: 100%;
    opacity: 0;
    transform: scale(0.98);
    animation: fadeInScaleLoader 0.4s ease-in 0.6s forwards;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 3px solid var(--graphite);
    border-top-color: var(--white);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading-text {
    color: var(--grey);
    font-size: 1.2rem;
    font-family: PTSans-Regular, Tahoma, sans-serif;
    letter-spacing: 0.5px;
    text-align: center;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@keyframes fadeInScaleLoader {
    0% {
        opacity: 0;
        transform: scale(0.98);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

@media (max-width: 767px) {
    .spinner { width: 50px; height: 50px; }    
    .loading-text { font-size: 1rem; }
    .loading-spinner { min-height: 300px; }
}

@media (max-width: 575px) {
    .spinner { width: 40px; height: 40px; border-width: 2px; }    
    .loading-text { font-size: 0.9rem; }
    .loading-spinner { min-height: 250px; gap: 1rem; }
}


/* == МОДАЛЬНЫЕ ОКНА == */

/* Анимация появления */
@keyframes scaleInModal {
    from {
        opacity: 0;
        transform: scale(0.7);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Анимация отправки письма */
@keyframes flyAndBounce {
    0% {
        left: -2.5rem;
        transform: translateY(0);
    }
    13% {
        transform: translateY(1rem);
    }
    25% {
        transform: translateY(0);
    }
    37% {
        transform: translateY(1rem);
    }
    50% {
        transform: translateX(-50%) translateY(0);
    }
    63% {
        transform: translateX(-50%) translateY(1rem);
    }
    75% {
        transform: translateX(-50%) translateY(0);
    }
    87% {
        transform: translateX(-50%) translateY(1rem);
    }
    100% {
        left: calc(100% + 0.5rem);
        transform: translateX(0) translateY(0);
    }
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    visibility: hidden;
    opacity: 0;
    transition: visibility 0.6s ease, opacity 0.6s ease;

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

.modal {
    background-color: var(--black);
    border: 2px solid var(--graphite);
    border-radius: 0.6rem;
    max-width: 440px;
    width: 96%;
    max-height: 98dvh;
    overflow-y: auto;
    opacity: 0;
    animation: scaleInModal 0.3s ease-out 0.4s forwards;

    &.modal-large {
        max-width: 800px;
    }

    /* Заголовок модалки */
    > .modal-header {
        display: flex;
        flex-flow: row nowrap;
        justify-content: space-between;
        align-items: center;
        column-gap: 0.8rem;
        padding: 1.2rem 1.5rem;
        border-bottom: 1px solid var(--graphite);
        background: linear-gradient(135deg, rgba(255,255,255,0.1) 10%, rgba(255,255,255,0) 100%);

        > .modal-header-icon {
            flex-shrink: 0;
            align-self: flex-start;
            display: block;
            width: 1.5rem;
            aspect-ratio: 1 / 1;
            background-size: contain;
            background-repeat: no-repeat;
            background-position: center;

            &.icon_mail { background-image: url('../img/icons/mail.svg'); }
            &.icon_demo { background-image: url('../img/icons/key_lock.svg'); }
        }
        

        > h3 {
            flex-grow: 1;
            font-size: 1.4rem;
            font-weight: 800;
            text-transform: uppercase;
            letter-spacing: 1px;
            background: linear-gradient(135deg, var(--white) 0%, var(--grey) 100%);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        > .modal-close {
            align-self: flex-start;
            display: flex;
            align-items: center;
            justify-content: center;
            width: 2rem;
            height: 2rem;
            border-radius: 50%;
            font-size: 1.8rem;
            color: var(--grey);
            cursor: pointer;
            transition: color 0.2s, transform 0.2s;
            
            &:hover {
                color: var(--white);
                transform: rotate(90deg);
            }
        }
    }

    /* Тело модалки */
    > .modal-body {
        display: flex;
        flex-flow: column nowrap;
        align-items: center;
        justify-content: space-around;
        row-gap: 1.8rem;
        padding: 1.8rem 1.5rem;

        /* Описание формы */
        & .form-description {
            height: 3rem;
            color: var(--grey);
            font-size: 1.1rem;
            text-align: center;
        }

        /* Сообщения об ошибках и успехе */
        & .error-message {
            height: 3rem;
            width: 100%;
            font-size: 0.8rem;
            color: var(--error);
            text-align: center;
            visibility: hidden;
            opacity: 0;

            &.show {  visibility: visible; opacity: 1; }
        }

        & .success-message {
            height: 3rem;
            color: var(--success);
            font-size: 0.9rem;
            text-align: center;
        }

        /* Формы */
        > .modal-form {
            width: 100%;

            /* Форма запроса (mail) кода доступа */
            &.form_code-request {
                display: grid;
                grid-template-columns: 2fr 3fr;
                grid-template-rows: repeat(4, 1fr);
                grid-column-gap: 1rem;
                grid-row-gap: 1rem;

                >:nth-child(1) { grid-area: 1 / 1 / 2 / 2; }
                >:nth-child(2) { grid-area: 2 / 1 / 3 / 2; }
                >:nth-child(3) { grid-area: 3 / 1 / 4 / 2; }
                >:nth-child(4) { grid-area: 4 / 1 / 5 / 2; }
                >:nth-child(5) { grid-area: 1 / 2 / 4 / 3; }
                > .form-description,
                  .waiting-mail-loader,
                  .error-message,
                  .success-message {
                    grid-area: 4 / 2 / 5 / 3;
                    display: none;
                    justify-content: center;
                    align-items: center;
                    text-align: center;
                }
                > .form-description { display: flex; }
                > .waiting-mail-loader {
                    height: 3rem;
                    position: relative;
                    overflow: hidden;
                    > .mail-loader-icon {
                        position: absolute; 
                        top: 0.1rem;
                        left: -2.5rem;
                        height: 1.9rem;
                        aspect-ratio: 1 / 1;
                        background-image: url('../img/icons/mail.svg');
                        background-size: contain;
                        background-repeat: no-repeat;
                        background-position: center;
                        animation: flyAndBounce 2s cubic-bezier(0.4, 0.1, 0.6, 1) infinite;
                    }
                }
            }   

            /* Форма ввода кода доступа */
            &.form_demo {
                display: flex;
                flex-direction: column;
                min-height: 0;

                > .error-message {
                    margin-top: 0.5rem;
                    margin-bottom: -1.3rem;
                }
            }
            
            .form-group {
                display: flex;
                flex-direction: column;
                gap: 0.5rem;

                > label {
                    font-size: 0.85rem;
                    font-weight: 800;
                    text-transform: uppercase;
                    letter-spacing: 0.5px;
                    color: var(--grey);

                    > span {
                        display: inline-block;
                        font-size: 1.1rem;
                        color: var(--error);
                        transform: translateY(-0.1rem);
                    }
                }
            }

            .modal-input,
            .modal-textarea {
                background-color: rgba(255, 255, 255, 0.05);
                border: 1px solid var(--graphite);
                border-radius: 0.6rem;
                padding: 0.8rem 1rem;
                font-size: 0.95rem;
                font-family: PTSans-Regular, Tahoma, sans-serif;
                color: var(--white);
                transition: all 0.2s;
            }

            .modal-textarea {
                flex-grow: 1;
                resize: none;
                overflow-y: auto;
            }

            .modal-input:focus,
            .modal-textarea:focus {
                outline: none;
                border-color: var(--grey);
                background-color: rgba(255, 255, 255, 0.08);

                &::placeholder {
                    opacity: 0;
                    transition: opacity 0.4s ease;
                }
            }

            .modal-input::placeholder,
            .modal-textarea::placeholder {
                color: rgba(128, 128, 128, 0.5);
            }
        }
    }

    /* Футер модалки */
    > .modal-footer {
        padding: 1rem 1.5rem;
        border-top: 1px solid var(--graphite);
        display: flex;
        justify-content: space-between;
        align-items: center;
        gap: 1rem;
        background: linear-gradient(135deg, rgba(255,255,255,0.1) 10%, rgba(255,255,255,0) 100%);

        /* Кнопки */
        > .modal-btn {
            padding: 0.7rem 1.5rem;
            border: 1px solid var(--graphite);
            border-radius: 0.6rem;
            color: var(--white);
            cursor: pointer;
            font-size: 0.9rem;
            font-weight: 800;
            text-transform: uppercase;
            transition: all 0.3s;

            &.modal-btn-primary {
                background-color: rgba(255, 255, 255, 0.2);
            }    
            &.modal-btn-secondary {
                background-color: rgba(255, 255, 255, 0.08);
                border-color: var(--graphite);
            }

            &:hover {
                background: linear-gradient(135deg, var(--grey) 0%, var(--blackout) 100%);
                color: var(--black);
            }

            &.btn-disabled {
                opacity: 0.6;
                cursor: not-allowed;
                transform: none;
                pointer-events: none;
            }
        }
       
        /* Ссылки */
        > .modal-link-btn {
            background: none;
            border: none;
            color: var(--grey);
            cursor: pointer;
            font-size: 0.85rem;
            text-decoration: underline;
            text-underline-offset: 3px;
            transition: color 0.2s;
            padding: 0.4rem 0.8rem;

            &:hover {
                color: var(--white);
            }
        }
    }
}

/* Блокировка скролла body */
body.modal-open {
    overflow: hidden;
}

/* Стилизация скроллов внутри модалки */
.custom-scroll {
    scrollbar-width: thin;                 
    scrollbar-color: var(--graphite) rgba(0, 0, 0, 0.03);
    
    &::-webkit-scrollbar {
        width: 6px;
        height: 6px;
    }
    
    &::-webkit-scrollbar-track {
        background: rgba(0, 0, 0, 0.03);
        border-radius: 3px;
    }
    
    &::-webkit-scrollbar-thumb {
        background: var(--graphite);
        border-radius: 3px;
        transition: background 0.2s;
    }
    
    &::-webkit-scrollbar-thumb:hover {
        background: var(--grey);
    }
    
    &::-webkit-scrollbar-corner {
        background: transparent;
    }

    /* Адаптивность */
    @media (max-width: 575px) {        
        > .modal-header {
            padding: 1rem;
            > h3 { font-size: 1.2rem; }
        }
            
        > .modal-body {
            padding: 1.2rem 1rem;
            & .form-description {
                font-size: 0.9rem;
            }
        }
        
        > .modal-footer {
            flex-flow: row wrap;
            gap: 0.8rem;
        }
        
    }

    @media (max-width: 479px) {    
        > .modal-body {
            
            > .modal-form { 
                /* Форма запроса (mail) кода доступа */
                &.form_code-request {
                    display: flex;
                    flex-flow: column nowrap;
                    align-items: stretch;
                    justify-content: space-between;
                    row-gap: 0.8rem;
                    >:nth-child(5) { flex-grow: 1; }
                }  

                .form-group {
                    > label { font-size: 0.75rem; }

                    .modal-input,
                    .modal-textarea {
                        padding: 0.6rem 0.8rem;
                        font-size: 0.85rem;
                    }
                } 
            }
        }

        > .modal-footer {
            flex-flow: column-reverse nowrap;
            > .modal-btn {
                width: 100%;
            }
        }
    }
}