/**
 * VIK AUTO TRADING - Loading Screen Styles
 *
 * 로딩 애니메이션:
 * 1. 텍스트 페이드인
 * 2. 바 양쪽→중앙 채움 + 금가루 낙하
 * 3. 바 수축→점 + 금가루 커튼
 * 4. 화면 전환
 */

/* ==========================================
   LOADING SCREEN CONTAINER
========================================== */

.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg-black);
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    z-index: var(--z-loading);
    -webkit-transition: opacity var(--duration-slow) var(--ease-out),
                        visibility var(--duration-slow) var(--ease-out);
    -o-transition: opacity var(--duration-slow) var(--ease-out),
                   visibility var(--duration-slow) var(--ease-out);
    transition: opacity var(--duration-slow) var(--ease-out),
                visibility var(--duration-slow) var(--ease-out);
}

.loading-screen.is-complete {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

/* 로고 상승 중 배경만 페이드아웃 (로고는 별도 z-index로 보임) */
.loading-screen.is-fading {
    background: transparent;
    -webkit-transition: background 1.5s var(--ease-out);
    -o-transition: background 1.5s var(--ease-out);
    transition: background 1.5s var(--ease-out);
}

.loading-screen.is-fading .loading-screen__text,
.loading-screen.is-fading .loading-screen__bar-wrapper {
    opacity: 0;
    -webkit-transition: opacity 0.3s var(--ease-out);
    -o-transition: opacity 0.3s var(--ease-out);
    transition: opacity 0.3s var(--ease-out);
}

/* ==========================================
   LOADING TEXT - 크고 굵게
========================================== */

.loading-screen__text {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: var(--font-weight-medium);
    letter-spacing: 12px;
    color: var(--color-gold-main);
    margin-bottom: var(--spacing-xl);
    opacity: 0;
    text-transform: uppercase;
    text-shadow: 0 0 30px var(--color-gold-glow);
    -webkit-transition: opacity var(--duration-normal) var(--ease-out);
    -o-transition: opacity var(--duration-normal) var(--ease-out);
    transition: opacity var(--duration-normal) var(--ease-out);
}

.loading-screen__text.is-visible {
    opacity: 1;
}

/* ==========================================
   LOADING BAR WRAPPER (파티클 포함)
========================================== */

.loading-screen__bar-wrapper {
    position: relative;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
}

/* ==========================================
   LOADING BAR - 2배 크기
========================================== */

.loading-screen__bar-container {
    width: 420px;
    height: 4px;
    background: var(--color-gold-subtle);
    position: relative;
    overflow: visible;
    border-radius: 2px;
    -webkit-transition: all var(--duration-fast) var(--ease-out);
    -o-transition: all var(--duration-fast) var(--ease-out);
    transition: all var(--duration-fast) var(--ease-out);
}

.loading-screen__bar {
    position: absolute;
    height: 100%;
    background: -webkit-gradient(
        linear,
        left top, right top,
        from(var(--color-gold-dark)),
        color-stop(20%, var(--color-gold-main)),
        color-stop(50%, var(--color-gold-bright)),
        color-stop(80%, var(--color-gold-main)),
        to(var(--color-gold-dark))
    );
    background: -o-linear-gradient(
        left,
        var(--color-gold-dark) 0%,
        var(--color-gold-main) 20%,
        var(--color-gold-bright) 50%,
        var(--color-gold-main) 80%,
        var(--color-gold-dark) 100%
    );
    background: linear-gradient(
        90deg,
        var(--color-gold-dark) 0%,
        var(--color-gold-main) 20%,
        var(--color-gold-bright) 50%,
        var(--color-gold-main) 80%,
        var(--color-gold-dark) 100%
    );
    width: 0;
    left: 50%;
    -webkit-transform: translateX(-50%);
    -ms-transform: translateX(-50%);
    transform: translateX(-50%);
    border-radius: 2px;
    -webkit-box-shadow:
        0 0 15px var(--color-gold-glow),
        0 0 30px rgba(245, 209, 122, 0.3);
    box-shadow:
        0 0 15px var(--color-gold-glow),
        0 0 30px rgba(245, 209, 122, 0.3);
}

/* ==========================================
   GOLD DUST PARTICLES (금가루)
========================================== */

.loading-screen__dust {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: 200px;
    pointer-events: none;
    overflow: hidden;
}

.loading-screen__dust-particle {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
    will-change: transform, opacity;
}

/* ==========================================
   BAR STATES
========================================== */

/* Bar State: Shrinking to dot */
.loading-screen__bar-container.is-shrinking {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    -webkit-transition: all var(--duration-fast) var(--ease-out);
    -o-transition: all var(--duration-fast) var(--ease-out);
    transition: all var(--duration-fast) var(--ease-out);
}

.loading-screen__bar-container.is-shrinking .loading-screen__bar {
    border-radius: 50%;
    -webkit-box-shadow:
        0 0 20px var(--color-gold-glow),
        0 0 40px rgba(245, 209, 122, 0.4);
    box-shadow:
        0 0 20px var(--color-gold-glow),
        0 0 40px rgba(245, 209, 122, 0.4);
}

/* ==========================================
   LOADING LOGO (점 → 원 확장 → 헤더로 이동)
========================================== */

.loading-screen__logo {
    position: fixed;
    left: 50%;
    top: 50%;
    width: 0;
    height: 0;
    -webkit-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    background: var(--color-bg-black);
    border: 2px solid var(--color-gold-main);
    border-radius: 50%;
    opacity: 0;
    z-index: calc(var(--z-loading) + 1);
    -webkit-box-shadow:
        0 0 20px var(--color-gold-glow),
        0 0 40px rgba(245, 209, 122, 0.3),
        inset 0 0 20px rgba(245, 209, 122, 0.1);
    box-shadow:
        0 0 20px var(--color-gold-glow),
        0 0 40px rgba(245, 209, 122, 0.3),
        inset 0 0 20px rgba(245, 209, 122, 0.1);
    -webkit-transition: all 0.6s var(--ease-out);
    -o-transition: all 0.6s var(--ease-out);
    transition: all 0.6s var(--ease-out);
}

.loading-screen__logo-img {
    width: 0;
    height: 0;
    border-radius: 50%;
    -o-object-fit: cover;
    object-fit: cover;
    -webkit-transition: width 0.4s var(--ease-out), height 0.4s var(--ease-out);
    -o-transition: width 0.4s var(--ease-out), height 0.4s var(--ease-out);
    transition: width 0.4s var(--ease-out), height 0.4s var(--ease-out);
}

/* 로고 확장 상태 */
.loading-screen__logo.is-expanding {
    width: 180px;
    height: 180px;
    opacity: 1;
}

.loading-screen__logo.is-expanding .loading-screen__logo-img {
    width: 140px;
    height: 140px;
}

/* 로고 상승 상태 (메인 콘텐츠 위치로 이동) */
.loading-screen__logo.is-rising {
    width: 150px;
    height: 150px;
    left: 50%;
    top: calc(50% - 120px);
    -webkit-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
    opacity: 1;
    -webkit-transition: width 1.5s var(--ease-out), height 1.5s var(--ease-out), top 1.5s var(--ease-out);
    -o-transition: width 1.5s var(--ease-out), height 1.5s var(--ease-out), top 1.5s var(--ease-out);
    transition: width 1.5s var(--ease-out), height 1.5s var(--ease-out), top 1.5s var(--ease-out);
}

.loading-screen__logo.is-rising .loading-screen__logo-img {
    width: 110px;
    height: 110px;
}

/* 로고 최종 위치 (메인 화면에 고정) */
.loading-screen__logo.is-final {
    width: 150px;
    height: 150px;
    left: 50%;
    top: calc(50% - 120px);
    -webkit-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
    opacity: 1;
    -webkit-transition: none;
    -o-transition: none;
    transition: none;
}

.loading-screen__logo.is-final .loading-screen__logo-img {
    width: 110px;
    height: 110px;
}

/* ==========================================
   MOBILE
========================================== */

@media (max-width: 768px) {
    .loading-screen__text {
        font-size: 20px;
        letter-spacing: 8px;
    }

    .loading-screen__bar-container {
        width: 280px;
        height: 3px;
    }

    .loading-screen__logo.is-expanding {
        width: 140px;
        height: 140px;
    }

    .loading-screen__logo.is-expanding .loading-screen__logo-img {
        width: 100px;
        height: 100px;
    }

    .loading-screen__logo.is-rising,
    .loading-screen__logo.is-final {
        width: 120px;
        height: 120px;
        left: 50%;
        top: calc(50% - 100px);
        -webkit-transform: translate(-50%, -50%);
        -ms-transform: translate(-50%, -50%);
        transform: translate(-50%, -50%);
        opacity: 1;
    }

    .loading-screen__logo.is-rising .loading-screen__logo-img,
    .loading-screen__logo.is-final .loading-screen__logo-img {
        width: 90px;
        height: 90px;
    }
}

@media (max-width: 480px) {
    .loading-screen__text {
        font-size: 16px;
        letter-spacing: 6px;
    }

    .loading-screen__bar-container {
        width: 220px;
    }
}