/* ============================================================
   /world/ 档案回收场景 —— 视觉层(重建版)
   设计目标:一眼就是"档案库",不是"一页文档列表":
   · 页头 = 终端著录面板:HUD 字体大字距、四角角标、网格排布;
   · 时轴 = 可见的主干:发光渐变竖线 + 脉冲幕节点 + ACT 编号;
   · 条目 = 档案卡:左侧大号 HUD 编号,右缘大百分比完整性,
     中缝信息;底部一条信号格弱信号噪动;
   · 全程走站点主题变量,亮模式自动翻墨。
   ============================================================ */

.arc {
    max-width: 760px;
    margin: 0 auto;
    padding: 0 4px 56px;
    font-family: var(--hud-font, ui-monospace, SFMono-Regular, Menlo, monospace);
}

/* ============ 页头:终端著录面板 ============ */
.arc__head {
    position: relative;
    margin-bottom: 34px;
    padding: 22px 22px 18px;
    border: 1px solid color-mix(in srgb, var(--accent) 34%, transparent);
    background:
        linear-gradient(180deg,
            color-mix(in srgb, var(--accent) 5%, transparent),
            transparent 55%);
}

/* 四角角标 */
.arc__head::before,
.arc__head::after {
    content: "";
    position: absolute;
    width: 12px;
    height: 12px;
    pointer-events: none;
}

.arc__head::before {
    left: -1px;
    top: -1px;
    border-left: 2px solid var(--accent, rgb(34, 211, 238));
    border-top: 2px solid var(--accent, rgb(34, 211, 238));
}

.arc__head::after {
    right: -1px;
    bottom: -1px;
    border-right: 2px solid var(--accent, rgb(34, 211, 238));
    border-bottom: 2px solid var(--accent, rgb(34, 211, 238));
}

.arc__kicker {
    font-size: 0.7em;
    letter-spacing: 0.34em;
    color: color-mix(in srgb, var(--accent) 72%, var(--primary));
    margin: 0 0 10px;
    text-transform: uppercase;
}

.arc__title {
    font-size: 2em;
    line-height: 1.15;
    margin: 0 0 18px;
    letter-spacing: 0.06em;
    font-weight: 700;
}

.arc__meta {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px 18px;
    padding: 0;
    border: 0;
    border-top: 1px dashed color-mix(in srgb, var(--accent) 25%, transparent);
    padding-top: 14px;
    font-size: 0.78em;
}

.arc__meta-i {
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.arc__meta-i i {
    font-style: normal;
    letter-spacing: 0.26em;
    color: var(--secondary);
    font-size: 0.86em;
}

.arc__meta-i b {
    font-weight: 600;
    color: var(--primary);
    letter-spacing: 0.05em;
}

.arc__law {
    margin: 16px 0 0;
    font-size: 0.8em;
    letter-spacing: 0.08em;
    color: color-mix(in srgb, var(--accent) 55%, var(--secondary));
}

.arc__law span {
    display: block;
    margin-top: 4px;
    color: var(--secondary);
    opacity: 0.72;
    letter-spacing: 0.05em;
}

/* ============ 时轴 ============ */
.arc__acts {
    position: relative;
    padding-left: 44px;
}

/* 主干:发光渐变竖线(可见,不再几乎隐形) */
.arc__acts::before {
    content: "";
    position: absolute;
    left: 14px;
    top: 10px;
    bottom: 10px;
    width: 2px;
    background: linear-gradient(180deg,
        color-mix(in srgb, var(--accent) 70%, transparent),
        color-mix(in srgb, var(--accent) 30%, transparent) 65%,
        transparent);
    box-shadow: 0 0 6px var(--glow-dim, rgba(34, 211, 238, 0.45));
}

/* ---- 幕 ---- */
.arc-act {
    position: relative;
    margin-bottom: 40px;
}

.arc-act__head {
    display: flex;
    align-items: baseline;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 14px;
}

/* 节点:大一号 + 脉冲环 */
.arc-act__dot {
    position: absolute;
    left: -44px;
    top: 4px;
    width: 14px;
    height: 14px;
    margin-left: 8px;
    border-radius: 50%;
    border: 2px solid var(--accent, rgb(34, 211, 238));
    background: var(--theme);
    box-shadow: 0 0 6px var(--glow-dim, rgba(34, 211, 238, 0.45));
}

.arc-act__dot::after {
    content: "";
    position: absolute;
    inset: -7px;
    border-radius: 50%;
    border: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
    animation: arc-pulse 2.6s ease-out infinite;
}

@keyframes arc-pulse {
    0%   { transform: scale(0.55); opacity: 0.9; }
    70%  { transform: scale(1.5); opacity: 0; }
    100% { transform: scale(1.5); opacity: 0; }
}

.arc-act__name {
    font-size: 1.12em;
    margin: 0;
    letter-spacing: 0.08em;
    font-weight: 700;
}

/* 幕编号:ACT I..VI 由 CSS 计数器生成 */
.arc__acts {
    counter-reset: arc-act;
}

.arc-act {
    counter-increment: arc-act;
}

.arc-act__head::before {
    content: "ACT " counter(arc-act, upper-roman);
    font-size: 0.66em;
    letter-spacing: 0.3em;
    color: color-mix(in srgb, var(--accent) 70%, var(--primary));
    border: 1px solid color-mix(in srgb, var(--accent) 34%, transparent);
    border-radius: 2px;
    padding: 2px 7px;
    align-self: center;
}

.arc-act__note {
    font-size: 0.7em;
    letter-spacing: 0.18em;
    color: var(--secondary);
}

/* ============ 档案卡 ============ */
.arc-act__list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.arc-item {
    position: relative;
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 16px;
    padding: 12px 16px 12px 14px;
    border: 1px solid var(--border, rgba(238, 238, 238, 0.5));
    border-left: 2px solid color-mix(in srgb, var(--accent) 42%, transparent);
    border-radius: 3px;
    background:
        linear-gradient(90deg,
            color-mix(in srgb, var(--accent) 3.5%, transparent),
            transparent 40%);
    text-decoration: none;
    transition: border-color 0.18s ease, background-color 0.18s ease,
        transform 0.18s ease;
}

.arc-item:hover {
    border-left-color: var(--accent, rgb(34, 211, 238));
    background-color: color-mix(in srgb, var(--accent) 6%, transparent);
    transform: translateX(4px);
}

/* 左缘信号格:竖排在卡最左边(贴 border-left),弱信号噪动 */
.arc-item__sig {
    display: flex;
    align-items: flex-end;
    gap: 2.5px;
    width: 20px;
    height: 26px;
    flex: 0 0 auto;
}

.arc-item__sig i {
    width: 3px;
    background: var(--accent, rgb(34, 211, 238));
    height: 20%;
    border-radius: 1px;
    opacity: 0.13;
    transition: opacity 0.2s ease;
}

.arc-item__sig i:nth-child(2) { height: 40%; }
.arc-item__sig i:nth-child(3) { height: 60%; }
.arc-item__sig i:nth-child(4) { height: 80%; }
.arc-item__sig i:nth-child(5) { height: 100%; }

.arc-item--s1 .arc-item__sig i:nth-child(-n+1),
.arc-item--s2 .arc-item__sig i:nth-child(-n+2),
.arc-item--s3 .arc-item__sig i:nth-child(-n+3),
.arc-item--s4 .arc-item__sig i:nth-child(-n+4),
.arc-item--s5 .arc-item__sig i:nth-child(-n+5) {
    opacity: 0.92;
}

.arc-item--s1 .arc-item__sig,
.arc-item--s2 .arc-item__sig {
    animation: arc-sig-noise 1.7s steps(2) infinite;
}

@keyframes arc-sig-noise {
    0%, 100% { opacity: 1; }
    50%      { opacity: 0.4; }
}

/* 编号:大号 HUD 字 */
.arc-item__no {
    font-size: 1.3em;
    font-weight: 700;
    letter-spacing: 0.12em;
    color: color-mix(in srgb, var(--accent) 62%, var(--primary));
    min-width: 2em;
    text-align: center;
}

.arc-item__body {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}

.arc-item__title {
    font-weight: 600;
    color: var(--primary);
    font-size: 0.98em;
    font-family: var(--body-font, inherit);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.arc-item:hover .arc-item__title {
    color: color-mix(in srgb, var(--accent) 55%, var(--primary));
}

.arc-item__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 3px 12px;
    font-size: 0.68em;
    letter-spacing: 0.1em;
    color: var(--secondary);
}

.arc-item__meta em {
    font-style: normal;
}

/* 右缘:完整性大百分比(HUD 字,视觉锚点) */
.arc-item__int {
    font-size: 1.5em;
    letter-spacing: 0.04em;
    color: color-mix(in srgb, var(--accent) 58%, var(--primary));
    font-weight: 600;
    margin-left: auto;
}

.arc-item__int::before {
    content: "完整性";
    display: block;
    font-size: 0.44em;
    letter-spacing: 0.3em;
    color: var(--secondary);
    font-weight: 400;
    text-align: right;
}

/* ============ 页脚 ============ */
.arc__foot {
    margin-top: 40px;
    padding-top: 16px;
    border-top: 1px dashed color-mix(in srgb, var(--accent) 25%, transparent);
    font-size: 0.68em;
    letter-spacing: 0.24em;
    color: var(--secondary);
}

.arc__foot p {
    margin: 0;
}

/* ============ 手机 ============ */
@media (max-width: 640px) {
    .arc__head {
        padding: 16px 14px 14px;
    }
    .arc__title {
        font-size: 1.5em;
    }
    .arc__meta {
        grid-template-columns: repeat(2, 1fr);
    }
    .arc__acts {
        padding-left: 30px;
    }
    .arc-act__dot {
        left: -30px;
    }
    .arc__acts::before {
        left: 9px;
    }
    .arc-item {
        grid-template-columns: auto 1fr;
        gap: 10px;
        padding: 10px 12px 10px 10px;
    }
    /* 手机上完整性收进 meta 行,不占右缘 */
    .arc-item__int {
        grid-column: 1 / -1;
        font-size: 0.9em;
        text-align: left;
        margin-left: 0;
    }
    .arc-item__int::before {
        display: inline;
        font-size: 0.85em;
        letter-spacing: 0.2em;
        margin-right: 6px;
        text-align: left;
    }
}

/* ============ reduced-motion ============ */
@media (prefers-reduced-motion: reduce) {

    .arc-item,
    .arc-item__sig,
    .arc-item__sig i {
        transition: none;
        animation: none;
    }

    .arc-act__dot::after {
        animation: none;
        opacity: 0;
    }
}