/* tutorial.css - 纵向下拉流排版 */

.tutorial-card {
    max-width: 380px;
    width: 92vw;
    max-height: 85vh;
    padding: 18px 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.tutorial-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-close-btn {
    background: none;
    border: none;
    font-size: 16px;
    color: var(--text-muted, #94a3b8);
    cursor: pointer;
    line-height: 1;
}

/* 纵向滚动内容主体 */
.tutorial-body {
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 18px;
    padding-right: 6px;
}

/* 极细滚动条 */
.tutorial-body::-webkit-scrollbar {
    width: 4px;
}
.tutorial-body::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

/* 单个规则区块：文字在上，动图在下 */
.rule-section {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.rule-title {
    font-size: 13.5px;
    font-weight: 700;
    color: var(--text, #0f172a);
}

.rule-text {
    font-size: 12px;
    line-height: 1.5;
    color: #475569;
}

.rule-text strong {
    color: var(--text, #0f172a);
}

/* 动图卡片区域 */
.rule-anim-box {
    background: #f8fafc;
    border-radius: 10px;
    padding: 4px;
    height: 75px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.diagram-svg {
    width: 100%;
    height: 100%;
    display: block;
}

/* ====================================================
   流畅 SVG 循环动效
   ==================================================== */

/* --- 1. 开局放环 --- */
.anim-s0-r1 { animation: s0Ring 2.6s infinite; }
.anim-s0-r2 { animation: s0Ring 2.6s 0.6s infinite; }
.anim-s0-r3 { animation: s0Ring 2.6s 1.2s infinite; }

@keyframes s0Ring {
    0% { transform: scale(1.6); opacity: 0; }
    20%, 80% { transform: scale(1); opacity: 1; }
    92%, 100% { opacity: 0; }
}

/* --- 2. 留子与滑行 --- */
.anim-s1-dot {
    transform-origin: 60px 38px;
    animation: s1Marker 3.2s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}
.anim-s1-ring {
    animation: s1Slide 3.2s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

@keyframes s1Marker {
    0%, 15% { transform: scale(0); opacity: 0; }
    25%, 80% { transform: scale(1); opacity: 1; }
    92%, 100% { opacity: 0; }
}
@keyframes s1Slide {
    0%, 25% { transform: translateX(0); opacity: 1; }
    50%, 80% { transform: translateX(160px); opacity: 1; }
    92%, 100% { transform: translateX(160px); opacity: 0; }
}

/* --- 3. 越子翻面 --- */
.anim-s2-ring {
    animation: s2Jump 3.4s cubic-bezier(0.45, 0, 0.2, 1) infinite;
}
.anim-s2-p1 {
    transform-origin: 115px 38px;
    animation: s2Flip1 3.4s ease infinite;
}
.anim-s2-p2 {
    transform-origin: 165px 38px;
    animation: s2Flip2 3.4s ease infinite;
}

@keyframes s2Jump {
    0%, 15% { transform: translateX(0); opacity: 1; }
    45%, 80% { transform: translateX(170px); opacity: 1; }
    90%, 100% { transform: translateX(170px); opacity: 0; }
}
@keyframes s2Flip1 {
    0%, 25% { fill: var(--piece-white, #f97316); transform: scaleY(1); }
    32% { transform: scaleY(0.1); }
    38%, 80% { fill: var(--piece-black, #0284c7); transform: scaleY(1); }
    90%, 100% { fill: var(--piece-white, #f97316); }
}
@keyframes s2Flip2 {
    0%, 35% { fill: var(--piece-white, #f97316); transform: scaleY(1); }
    42% { transform: scaleY(0.1); }
    48%, 80% { fill: var(--piece-black, #0284c7); transform: scaleY(1); }
    90%, 100% { fill: var(--piece-white, #f97316); }
}

/* --- 4. 五连与拔环 --- */
.anim-s3-box {
    fill: none;
    stroke: var(--piece-white, #f97316);
    stroke-width: 1.5;
    animation: s3Box 3.6s ease infinite;
}
.anim-s3-dots {
    animation: s3Clear 3.6s ease infinite;
}
.anim-s3-ring {
    animation: s3Score 3.6s cubic-bezier(0.34, 1.56, 0.64, 1) infinite;
}

@keyframes s3Box {
    0%, 15% { opacity: 0; stroke-dasharray: 4; }
    25%, 45% { opacity: 1; stroke-dasharray: 0; }
    55%, 100% { opacity: 0; }
}
@keyframes s3Clear {
    0%, 45% { opacity: 1; transform: scale(1); }
    52%, 85% { opacity: 0; }
    95%, 100% { opacity: 1; }
}
@keyframes s3Score {
    0%, 50% { transform: translateX(0); opacity: 1; }
    65%, 85% { transform: translateX(47px); opacity: 1; }
    92%, 100% { transform: translateX(47px); opacity: 0; }
}