/* ============================================
   首次访问使用技巧引导浮层
   光影志风格：朱砂红 + 金色 + 宣纸纹理
   ============================================ */

.onboarding-overlay {
    position: fixed;
    inset: 0;
    z-index: 99999;
    background: rgba(250, 248, 243, 0.75);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease, visibility 0.4s ease;
    padding: 20px;
    overflow-y: auto;
}

.onboarding-overlay.is-open {
    opacity: 1;
    visibility: visible;
}

.onboarding-modal {
    position: relative;
    max-width: 560px;
    width: 100%;
    background: linear-gradient(180deg, #faf8f3 0%, #f4f2ec 100%);
    border-radius: 18px;
    box-shadow: 0 24px 80px rgba(28, 20, 10, 0.35), 0 0 0 1px rgba(201, 169, 97, 0.18);
    overflow: hidden;
    transform: translateY(24px) scale(0.96);
    transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
    max-height: calc(100vh - 40px);
    display: flex;
    flex-direction: column;
}

.onboarding-overlay.is-open .onboarding-modal {
    transform: translateY(0) scale(1);
}

/* 宣纸纹理 */
.onboarding-modal::before {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.035 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    opacity: 0.6;
    z-index: 0;
}

/* 顶部装饰条 */
.onboarding-header {
    position: relative;
    z-index: 2;
    padding: 24px 40px 16px;
    text-align: center;
    border-bottom: 1px solid rgba(139, 46, 46, 0.08);
}

.onboarding-eyebrow {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: #c9a961;
    letter-spacing: 0.4em;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}
.onboarding-eyebrow::before,
.onboarding-eyebrow::after {
    content: '';
    width: 28px;
    height: 1px;
    background: #c9a961;
    opacity: 0.5;
}

.onboarding-title {
    font-family: 'Noto Serif SC', serif;
    font-weight: 900;
    font-size: 26px;
    color: #1c1c1c;
    letter-spacing: 0.08em;
    margin: 0 0 6px;
    line-height: 1.2;
}
.onboarding-title em {
    font-style: normal;
    color: #8b2e2e;
    position: relative;
}
.onboarding-title em::after {
    content: '';
    position: absolute;
    left: 8%;
    right: 8%;
    bottom: -6px;
    height: 3px;
    background: #8b2e2e;
    border-radius: 2px;
    transform: scaleX(0);
    transform-origin: left;
    animation: onbLine 0.7s 0.4s forwards;
}
@keyframes onbLine {
    to { transform: scaleX(1); }
}

.onboarding-subtitle {
    font-family: 'Cormorant Garamond', serif;
    font-style: italic;
    font-size: 14px;
    color: #6b6b6b;
    letter-spacing: 0.05em;
    margin: 10px 0 0;
}

/* 主体内容 */
.onboarding-body {
    position: relative;
    z-index: 2;
    padding: 14px 40px;
    overflow-y: auto;
    flex: 1;
}

/* 步骤列表 */
.onboarding-steps {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.onboarding-step {
    display: flex;
    gap: 12px;
    padding: 9px 12px;
    background: rgba(255, 255, 255, 0.6);
    border: 1px solid rgba(28, 28, 28, 0.06);
    border-radius: 10px;
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateX(-12px);
}

.onboarding-overlay.is-open .onboarding-step {
    animation: onbStepIn 0.5s forwards;
}
.onboarding-overlay.is-open .onboarding-step:nth-child(1) { animation-delay: 0.3s; }
.onboarding-overlay.is-open .onboarding-step:nth-child(2) { animation-delay: 0.4s; }
.onboarding-overlay.is-open .onboarding-step:nth-child(3) { animation-delay: 0.5s; }
.onboarding-overlay.is-open .onboarding-step:nth-child(4) { animation-delay: 0.6s; }

@keyframes onbStepIn {
    to { opacity: 1; transform: translateX(0); }
}

.onboarding-step:hover {
    background: rgba(255, 255, 255, 0.95);
    border-color: rgba(139, 46, 46, 0.15);
    transform: translateX(2px);
}

.onboarding-step-num {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: linear-gradient(135deg, #8b2e2e, #6b1f1f);
    color: #faf8f3;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Cormorant Garamond', serif;
    font-style: italic;
    font-weight: 600;
    font-size: 15px;
    box-shadow: 0 4px 12px rgba(139, 46, 46, 0.2);
}

.onboarding-step-content {
    flex: 1;
    min-width: 0;
}

.onboarding-step-title {
    font-family: 'Noto Serif SC', serif;
    font-weight: 700;
    font-size: 13px;
    color: #1c1c1c;
    margin: 0 0 3px;
    letter-spacing: 0.05em;
}

.onboarding-step-desc {
    font-size: 12px;
    color: #6b6b6b;
    line-height: 1.45;
    margin: 0;
}

.onboarding-step-desc code {
    background: rgba(139, 46, 46, 0.06);
    color: #8b2e2e;
    padding: 1px 6px;
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
}

/* 底部按钮区 */
.onboarding-footer {
    position: relative;
    z-index: 2;
    padding: 12px 40px 18px;
    border-top: 1px solid rgba(28, 28, 28, 0.06);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

/* "今日不再提示" 复选框 */
.onboarding-skip-today {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 12px;
    color: #6b6b6b;
    font-family: 'JetBrains Mono', monospace;
    letter-spacing: 0.05em;
    user-select: none;
}

.onboarding-skip-today input {
    appearance: none;
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border: 1.5px solid rgba(28, 28, 28, 0.2);
    border-radius: 4px;
    cursor: pointer;
    position: relative;
    transition: all 0.2s ease;
    background: transparent;
}

.onboarding-skip-today input:checked {
    background: #8b2e2e;
    border-color: #8b2e2e;
}

.onboarding-skip-today input:checked::after {
    content: '';
    position: absolute;
    left: 4px;
    top: 1px;
    width: 5px;
    height: 9px;
    border: solid #faf8f3;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.onboarding-skip-today:hover {
    color: #8b2e2e;
}

/* 主按钮 */
.onboarding-btn {
    background: linear-gradient(135deg, #8b2e2e, #6b1f1f);
    color: #faf8f3;
    border: none;
    padding: 11px 28px;
    border-radius: 999px;
    font-family: 'Noto Serif SC', serif;
    font-weight: 700;
    font-size: 13px;
    letter-spacing: 0.2em;
    cursor: pointer;
    transition: all 0.35s cubic-bezier(0.2, 0.8, 0.2, 1);
    box-shadow: 0 4px 14px rgba(139, 46, 46, 0.25);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.onboarding-btn:hover {
    background: linear-gradient(135deg, #b53d3d, #8b2e2e);
    color: #faf8f3 !important;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(139, 46, 46, 0.35);
    letter-spacing: 0.25em;
}

.onboarding-btn:active {
    transform: translateY(0);
}

/* 右上角关闭按钮 */
.onboarding-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(28, 28, 28, 0.04);
    border: none;
    color: #6b6b6b;
    cursor: pointer;
    z-index: 3;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.25s ease;
    font-size: 18px;
    line-height: 1;
}

.onboarding-close:hover {
    background: rgba(139, 46, 46, 0.1);
    color: #8b2e2e;
    transform: rotate(90deg);
}

/* 移动端适配 */
@media (max-width: 600px) {
    .onboarding-modal {
        max-width: 100%;
        border-radius: 14px;
    }
    .onboarding-header {
        padding: 24px 24px 16px;
    }
    .onboarding-title {
        font-size: 24px;
    }
    .onboarding-body {
        padding: 20px 24px;
    }
    .onboarding-footer {
        padding: 16px 24px 22px;
        flex-direction: column;
        align-items: stretch;
    }
    .onboarding-btn {
        justify-content: center;
    }
}

/* 夜间模式适配 - 保持浅色风格 */
html.ra0-dark-mode .onboarding-modal,
html[data-theme="dark"] .onboarding-modal {
    background: linear-gradient(180deg, #faf8f3 0%, #f4f2ec 100%) !important;
    box-shadow: 0 24px 80px rgba(28, 20, 10, 0.35), 0 0 0 1px rgba(201, 169, 97, 0.18) !important;
}
html.ra0-dark-mode .onboarding-title,
html[data-theme="dark"] .onboarding-title {
    color: #1c1c1c !important;
}
html.ra0-dark-mode .onboarding-step-title,
html[data-theme="dark"] .onboarding-step-title {
    color: #1c1c1c !important;
}
html.ra0-dark-mode .onboarding-step,
html[data-theme="dark"] .onboarding-step {
    background: rgba(255, 255, 255, 0.6);
    border-color: rgba(28, 28, 28, 0.06);
}
html.ra0-dark-mode .onboarding-step:hover,
html[data-theme="dark"] .onboarding-step:hover {
    background: rgba(255, 255, 255, 0.95);
}
html.ra0-dark-mode .onboarding-step-desc,
html[data-theme="dark"] .onboarding-step-desc,
html.ra0-dark-mode .onboarding-subtitle,
html[data-theme="dark"] .onboarding-subtitle {
    color: #6b6b6b !important;
}