/* ===========================================================================
   RedoSchool — загрузочный экран.
   Космический фон + 4 слайда-подсказки (появляются по очереди, парят),
   лого снизу-слева (покачивается и пульсирует), прогресс-бар и приглашение
   «нажми любую кнопку». Разметка — #loader в index.html, логика — loader.js.
   =========================================================================== */

#loader {
    position: absolute;
    inset: 0;
    z-index: 15;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background-color: #1a2160;
    opacity: 1;
    transition: opacity 420ms ease;
}

#loader[hidden] {
    display: none;
}

/* Фоновый слой — чуть больше вьюпорта, чтобы параллакс не открывал края */
.ld-bg {
    position: absolute;
    inset: -40px;
    background: url("loading/bg.jpg") center / cover no-repeat;
    will-change: transform;
    transform: translate3d(0, 0, 0);
}

.ld-vignette {
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(120% 90% at 50% 0%, rgba(24, 33, 92, 0) 40%, rgba(9, 12, 40, 0.5) 100%);
}

#loader.done {
    opacity: 0;
    pointer-events: none;
}

/* ------------------------------ Звёзды-искры ------------------------------ */
.ld-scene {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.ld-star {
    position: absolute;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: #ffffff;
    box-shadow: 0 0 10px 2px rgba(190, 232, 255, 0.95);
    opacity: 0.55;
    animation: ld-twinkle 3.2s ease-in-out infinite;
}

/* Крестообразный «блик» — придаёт звёздам искристость */
.ld-star::before,
.ld-star::after {
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    background: linear-gradient(rgba(255, 255, 255, 0), rgba(210, 240, 255, 0.95), rgba(255, 255, 255, 0));
    transform: translate(-50%, -50%);
}

.ld-star::before { width: 1.5px; height: 20px; }
.ld-star::after  { width: 20px; height: 1.5px; }

.ld-star-1  { left: 22%; top: 18%; animation-delay: 0s;   transform: scale(1); }
.ld-star-2  { left: 68%; top: 12%; animation-delay: 0.7s; transform: scale(0.7); }
.ld-star-3  { left: 84%; top: 40%; animation-delay: 1.4s; transform: scale(1.3); }
.ld-star-4  { left: 12%; top: 52%; animation-delay: 2.1s; transform: scale(0.9); }
.ld-star-5  { left: 46%; top: 22%; animation-delay: 1.1s; transform: scale(0.6); }
.ld-star-6  { left: 58%; top: 46%; animation-delay: 2.6s; transform: scale(1.1); }
.ld-star-7  { left: 32%; top: 33%; animation-delay: 0.4s; transform: scale(0.8); }
.ld-star-8  { left: 76%; top: 24%; animation-delay: 1.8s; transform: scale(1.15); }
.ld-star-9  { left: 90%; top: 58%; animation-delay: 2.3s; transform: scale(0.7); }
.ld-star-10 { left: 8%;  top: 30%; animation-delay: 1.5s; transform: scale(1); }
.ld-star-11 { left: 40%; top: 10%; animation-delay: 0.9s; transform: scale(0.65); }
.ld-star-12 { left: 63%; top: 60%; animation-delay: 3.0s; transform: scale(0.85); }
.ld-star-13 { left: 18%; top: 66%; animation-delay: 0.2s; transform: scale(1.2); }
.ld-star-14 { left: 52%; top: 34%; animation-delay: 2.4s; transform: scale(0.6); }
.ld-star-15 { left: 71%; top: 50%; animation-delay: 1.2s; transform: scale(0.95); }
.ld-star-16 { left: 28%; top: 47%; animation-delay: 1.9s; transform: scale(0.75); }
.ld-star-17 { left: 94%; top: 28%; animation-delay: 0.6s; transform: scale(1.05); }
.ld-star-18 { left: 5%;  top: 44%; animation-delay: 2.8s; transform: scale(0.8); }

/* ------------------------------- Слайды ---------------------------------- */
.ld-slides {
    position: relative;
    z-index: 2;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: clamp(18px, 3.2vw, 56px);
    width: min(1280px, 92vw);
    margin-bottom: clamp(60px, 12vh, 130px);
}

.ld-slide {
    flex: 1 1 0;
    max-width: 260px;
    opacity: 0;
    transform: translateY(46px) scale(0.94);
    transition: opacity 720ms cubic-bezier(0.22, 1, 0.36, 1),
                transform 720ms cubic-bezier(0.22, 1, 0.36, 1);
    will-change: opacity, transform;
}

.ld-slide.is-in {
    opacity: 1;
    transform: translateY(0) scale(1);
}

/* Внутренний слой парит вверх-вниз — не конфликтует с анимацией появления */
.ld-slide-inner {
    display: flex;
    flex-direction: column;
    gap: clamp(10px, 1.4vh, 18px);
    animation: ld-float 4.6s ease-in-out infinite;
}

.ld-slide[data-step="1"] .ld-slide-inner { animation-delay: -0.2s; }
.ld-slide[data-step="2"] .ld-slide-inner { animation-delay: -1.4s; }
.ld-slide[data-step="3"] .ld-slide-inner { animation-delay: -2.6s; }
.ld-slide[data-step="4"] .ld-slide-inner { animation-delay: -3.6s; }

.ld-slide-head {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding-left: 4px;
}

.ld-num {
    flex: 0 0 auto;
    font-size: clamp(30px, 3.4vw, 46px);
    font-weight: 900;
    line-height: 0.9;
    color: #ffffff;
    text-shadow: 0 2px 10px rgba(11, 20, 60, 0.55);
}

.ld-caption {
    font-size: clamp(14px, 1.35vw, 20px);
    font-weight: 800;
    line-height: 1.12;
    color: #ffffff;
    text-shadow: 0 2px 8px rgba(11, 20, 60, 0.5);
    padding-top: 2px;
}

.ld-card {
    position: relative;
    border-radius: 22px;
    filter: drop-shadow(0 18px 30px rgba(7, 14, 48, 0.45));
}

.ld-card img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 22px;
    pointer-events: none;
    -webkit-user-drag: none;
}

/* --------------------------- Прогресс и статус --------------------------- */
.ld-footer {
    position: absolute;
    left: 50%;
    bottom: clamp(38px, 8vh, 72px);
    transform: translateX(-50%);
    z-index: 3;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    width: min(760px, 74vw);
    text-align: center;
}

.ld-status {
    font-size: clamp(20px, 2.4vw, 34px);
    font-weight: 900;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: #ffffff;
    text-shadow: 0 3px 14px rgba(9, 14, 44, 0.6);
}

#loader.is-ready .ld-status {
    animation: ld-bounce 0.95s cubic-bezier(0.28, 0.84, 0.42, 1) infinite;
}

.ld-bar {
    position: relative;
    width: 100%;
    height: clamp(26px, 3vh, 38px);
    border-radius: 999px;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.18), rgba(255, 255, 255, 0.04)),
        rgba(18, 30, 78, 0.55);
    border: 2px solid rgba(180, 214, 255, 0.55);
    box-shadow:
        inset 0 2px 6px rgba(4, 10, 36, 0.5),
        0 0 22px rgba(120, 180, 255, 0.35);
    overflow: hidden;
    padding: 3px;
}

.ld-bar-fill {
    width: 0%;
    height: 100%;
    min-width: 0;
    border-radius: 999px;
    background-color: var(--rs-orange);
    background-image:
        repeating-linear-gradient(
            115deg,
            rgba(255, 255, 255, 0.28) 0 14px,
            rgba(255, 255, 255, 0) 14px 30px
        ),
        linear-gradient(90deg, var(--rs-orange-hi), var(--rs-orange) 55%, var(--rs-orange-lo));
    background-size: 60px 100%, 100% 100%;
    box-shadow:
        inset 0 2px 4px rgba(255, 255, 255, 0.45),
        inset 0 -3px 6px rgba(180, 70, 0, 0.4);
    transition: width 260ms ease;
    animation: ld-stripes 0.9s linear infinite;
}

.ld-press {
    margin-top: 2px;
    font-size: clamp(15px, 1.6vw, 22px);
    font-weight: 800;
    letter-spacing: 0.04em;
    color: #ffe6b0;
    text-shadow: 0 2px 10px rgba(9, 14, 44, 0.6);
    animation: ld-press-pulse 1.1s ease-in-out infinite;
}

.ld-press[hidden] {
    display: none;
}

/* -------------------------------- Лого ----------------------------------- */
.ld-logo {
    position: absolute;
    left: clamp(18px, 3vw, 60px);
    bottom: clamp(14px, 3vh, 44px);
    z-index: 4;
    width: clamp(150px, 17vw, 300px);
    height: auto;
    transform-origin: 50% 85%;
    filter: drop-shadow(0 10px 24px rgba(6, 12, 44, 0.55));
    animation: ld-logo-wobble 4.2s ease-in-out infinite;
    pointer-events: none;
    -webkit-user-drag: none;
}

/* ------------------------------ Анимации --------------------------------- */
@keyframes ld-float {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-14px); }
}

@keyframes ld-twinkle {
    0%, 100% { opacity: 0.2; }
    50%      { opacity: 1; }
}

@keyframes ld-stripes {
    from { background-position: 0 0, 0 0; }
    to   { background-position: 60px 0, 0 0; }
}

@keyframes ld-bounce {
    0%, 100% { transform: translateY(0); }
    35%      { transform: translateY(-12px); }
    55%      { transform: translateY(2px); }
}

@keyframes ld-press-pulse {
    0%, 100% { opacity: 0.55; transform: scale(0.98); }
    50%      { opacity: 1;    transform: scale(1.04); }
}

@keyframes ld-logo-wobble {
    0%, 100% { transform: rotate(-3.5deg) scale(1); }
    50%      { transform: rotate(3.5deg) scale(1.07); }
}

/* ------------------------------ Адаптив ---------------------------------- */
@media (max-width: 900px) {
    .ld-slides {
        flex-wrap: wrap;
        gap: clamp(14px, 3vw, 26px);
        width: 94vw;
        margin-bottom: clamp(120px, 22vh, 200px);
    }
    .ld-slide {
        flex: 1 1 40%;
        max-width: 44%;
    }
}

@media (max-width: 560px) {
    .ld-slides {
        margin-bottom: clamp(150px, 26vh, 220px);
    }
    .ld-slide {
        flex: 1 1 42%;
        max-width: 46%;
    }
    .ld-caption { font-size: 13px; }
    .ld-num { font-size: 28px; }
    .ld-logo { width: clamp(120px, 34vw, 170px); }
    .ld-footer { width: 88vw; }
}

/* Уважаем настройку «уменьшить движение» */
@media (prefers-reduced-motion: reduce) {
    .ld-slide-inner,
    .ld-star,
    .ld-logo,
    .ld-bar-fill,
    #loader.is-ready .ld-status,
    .ld-press {
        animation: none !important;
    }
    .ld-slide {
        transition-duration: 300ms;
    }
}