/* ============================================
   π Lab — Page Loading Progress
   ============================================ */

/* 覆盖原有 page-loader 样式 */
.page-loader {
    background: #0a0c1a !important;
    position: fixed !important;
    height: 100% !important;
    width: 100% !important;
    top: 0 !important;
    left: 0 !important;
    z-index: 99999 !important;
    opacity: 1 !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    transition: opacity 0.8s ease, visibility 0.8s ease;
}

.page-loader.fade-out {
    opacity: 0 !important;
    visibility: hidden;
}

/* 隐藏原有 spinner */
.page-loader .spinner,
.page-loader .double-bounce1,
.page-loader .double-bounce2,
.page-loader-inner {
    display: none !important;
}

/* ---- 背景粒子装饰 ---- */
.pi-loader-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
}

.pi-loader-bg::before {
    content: '';
    position: absolute;
    width: 700px;
    height: 700px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(80, 92, 253, 0.22) 0%, transparent 70%);
    top: -150px;
    left: -150px;
    animation: pi-glow-drift 8s ease-in-out infinite alternate;
}

.pi-loader-bg::after {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(120, 80, 253, 0.18) 0%, transparent 70%);
    bottom: -100px;
    right: -100px;
    animation: pi-glow-drift 10s ease-in-out infinite alternate-reverse;
}

@keyframes pi-glow-drift {
    from { transform: translate(0, 0) scale(1); }
    to   { transform: translate(40px, 30px) scale(1.1); }
}

/* ---- 主容器 ---- */
.pi-loader-content {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 32px;
    width: 360px;
}

/* ---- Logo / π 符号 ---- */
.pi-loader-logo {
    display: flex;
    align-items: center;
    gap: 14px;
    animation: pi-logo-in 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

@keyframes pi-logo-in {
    from { opacity: 0; transform: translateY(-20px) scale(0.8); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

.pi-loader-symbol {
    font-size: 72px;
    font-weight: 700;
    line-height: 1;
    background: linear-gradient(135deg, #505cfd 0%, #a78bfa 50%, #60a5fa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 20px rgba(80, 92, 253, 0.6));
    font-family: 'Georgia', serif;
}

.pi-loader-title {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.pi-loader-title-main {
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.9);
    font-family: 'Helvetica Neue', sans-serif;
}

.pi-loader-title-sub {
    font-size: 11px;
    letter-spacing: 2px;
    color: rgba(255, 255, 255, 0.45);
    font-family: 'Helvetica Neue', sans-serif;
    text-transform: uppercase;
}

/* ---- 进度条区域 ---- */
.pi-loader-progress-wrap {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 10px;
    animation: pi-bar-in 0.6s 0.2s ease both;
}

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

/* 进度条轨道 */
.pi-loader-track {
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 999px;
    overflow: hidden;
    position: relative;
}

/* 进度条填充 */
.pi-loader-fill {
    height: 100%;
    width: 0%;
    border-radius: 999px;
    background: linear-gradient(90deg, #505cfd, #a78bfa, #60a5fa);
    background-size: 200% 100%;
    transition: width 0.3s ease;
    position: relative;
    animation: pi-shimmer 2s linear infinite;
}

@keyframes pi-shimmer {
    0%   { background-position: 200% center; }
    100% { background-position: -200% center; }
}

/* 进度条光晕 */
.pi-loader-fill::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: rgba(167, 139, 250, 0.6);
    filter: blur(6px);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.pi-loader-fill.active::after {
    opacity: 1;
}

/* 进度数字 */
.pi-loader-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.pi-loader-percent {
    font-size: 12px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.7);
    font-family: 'Courier New', monospace;
    letter-spacing: 1px;
    min-width: 40px;
}

.pi-loader-status {
    font-size: 11px;
    color: rgba(255, 255, 255, 0.3);
    font-family: 'Helvetica Neue', sans-serif;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    transition: color 0.3s ease;
}

/* ---- 底部点状装饰 ---- */
.pi-loader-dots {
    display: flex;
    gap: 6px;
    animation: pi-bar-in 0.6s 0.4s ease both;
}

.pi-loader-dots span {
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: rgba(80, 92, 253, 0.5);
    animation: pi-dot-pulse 1.4s ease-in-out infinite;
}

.pi-loader-dots span:nth-child(2) { animation-delay: 0.2s; }
.pi-loader-dots span:nth-child(3) { animation-delay: 0.4s; }
.pi-loader-dots span:nth-child(4) { animation-delay: 0.6s; }
.pi-loader-dots span:nth-child(5) { animation-delay: 0.8s; }

@keyframes pi-dot-pulse {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50%       { opacity: 1;   transform: scale(1.5); background: #a78bfa; }
}