/* ============================================
   阶段三 · 极光信函
   深夜夜空 · 烛光悬浮文字
   ============================================ */

/* ---- 舞台 ---- */
#letter-stage {
    position: absolute;
    inset: 0;
    z-index: 10;
    opacity: 0;
    transition: opacity 1s ease;
    overflow-y: auto;
    background:
        radial-gradient(
            ellipse 50% 35% at 50% 40%,
            rgba(223, 160, 95, 0.04) 0%,
            transparent 70%
        );
}
#letter-stage.stage-active { opacity: 1; }

/* 滚动条美化 */
#letter-stage::-webkit-scrollbar { width: 3px; }
#letter-stage::-webkit-scrollbar-track { background: transparent; }
#letter-stage::-webkit-scrollbar-thumb {
    background: rgba(223, 160, 95, 0.12);
    border-radius: 2px;
}

/* ---- 文字容器：从上方自然排列 ---- */
.aurora-container {
    padding: 8vh 6% 10vh 6%;
    max-width: 800px;
    margin: 0 auto;
    pointer-events: none;
}

/* ---- 极光文字（半透明悬浮质感） ---- */
.aurora-text {
    font-family: 'Georgia', 'Noto Serif SC', 'STSong', serif;
    font-size: 1.1rem;
    line-height: 1.85;
    letter-spacing: 0.03em;
    /* 半透明白 + 多层烛光暖晕 */
    color: rgba(255, 248, 231, 0.88);
    text-shadow:
        0 0 4px  rgba(223, 160, 95, 0.20),
        0 0 10px rgba(223, 160, 95, 0.10),
        0 0 22px rgba(223, 160, 95, 0.05);
    white-space: pre-wrap;
    word-break: break-word;
}

/* ---- 单个字符 ---- */
.aurora-text .char {
    display: inline;
}

/* ---- 换行符 ---- */
.aurora-text br {
    content: '';
    display: block;
}

/* ============================================
   终极落款
   ============================================ */
.aurora-closing {
    margin-top: 36px;
    text-align: center;
}

.aurora-closing .closing-message {
    font-family: 'Georgia', 'Noto Serif SC', serif;
    font-size: 1.25rem;
    letter-spacing: 3px;
    color: rgba(255, 238, 221, 0.92);
    text-shadow:
        0 0 8px  rgba(223, 160, 95, 0.30),
        0 0 20px rgba(223, 160, 95, 0.12),
        0 0 40px rgba(223, 160, 95, 0.06);
    line-height: 1.6;
}

/* ---- 响应式 ---- */
@media (max-width: 600px) {
    .aurora-container {
        padding: 7vh 6% 9vh 6%;
    }
    .aurora-text {
        font-size: 0.95rem;
        line-height: 1.8;
    }
    .aurora-closing .closing-message {
        font-size: 1.05rem;
    }
}
@media (max-height: 600px) {
    .aurora-container {
        padding-top: 8vh;
    }
}