/* ========== CSS 变量 & 基础样式 ========== */
:root {
    --accent: #d95454;
    --accent-light: #e87878;
    --accent-muted: rgba(217, 84, 84, 0.18);
    --accent-rgb: 217, 84, 84;

    --bg-card: rgba(22, 22, 30, 0.82);
    --bg-card-hover: rgba(28, 28, 38, 0.88);
    --border-card: rgba(255, 255, 255, 0.07);
    --border-subtle: rgba(255, 255, 255, 0.05);

    --text-primary: #e8e8ee;
    --text-secondary: #b8b8c4;
    --text-muted: #8a8a98;
    --text-code: #f0f0f5;

    --bg-code: rgba(255, 255, 255, 0.06);
    --bg-note-warning: rgba(255, 180, 60, 0.08);
    --bg-note-info: rgba(120, 160, 220, 0.08);
    --border-note-warning: rgba(255, 180, 60, 0.25);
    --border-note-info: rgba(120, 160, 220, 0.25);

    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 24px;

    --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', 'Monaco', 'Menlo', monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;

    --transition-fast: 0.18s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.45s cubic-bezier(0.25, 0.46, 0.45, 0.94);

    --max-content-width: 780px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    background-color: #0d0d14;
    color: var(--text-primary);
    line-height: 1.65;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========== 背景层 ========== */
.bg-layer {
    position: fixed;
    inset: 0;
    z-index: -1;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    /* 默认背景，JS会覆盖 */
    background-image: url('bg_reimu.webp');
}

/* 背景遮罩，让文字更清晰 */
.bg-layer::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(8, 8, 16, 0.55);
    pointer-events: none;
}

/* ========== 主滚动容器 ========== */
.main-scroll {
    position: relative;
    z-index: 1;
}

/* ========== Hero 区域 ========== */
.hero {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem 1.5rem;
    position: relative;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
    animation: fadeInUp 0.8s var(--transition-slow) both;
}

.hero-badge {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent-light);
    background: var(--accent-muted);
    padding: 0.35em 1em;
    border-radius: 50px;
    border: 1px solid rgba(var(--accent-rgb), 0.3);
}

.hero-title {
    font-size: clamp(2.2rem, 5vw, 3.6rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    color: #ffffff;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--text-secondary);
    font-weight: 400;
    max-width: 500px;
}

/* 开始按钮 */
.btn-start {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    margin-top: 1rem;
    padding: 0.85rem 2.4rem;
    font-size: 1.05rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    color: #ffffff;
    background: var(--accent);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
    position: relative;
    outline: none;
    -webkit-tap-highlight-color: transparent;
}

.btn-start:hover {
    background: var(--accent-light);
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(var(--accent-rgb), 0.3);
}

.btn-start:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(var(--accent-rgb), 0.25);
}

.btn-start:focus-visible {
    outline: 2px solid var(--accent-light);
    outline-offset: 4px;
}

.arrow-down {
    display: inline-block;
    animation: bounceDown 1.8s ease-in-out infinite;
}

@keyframes bounceDown {
    0%,
    100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(6px);
    }
    60% {
        transform: translateY(2px);
    }
    80% {
        transform: translateY(5px);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(28px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 滚动提示点 */
.scroll-hint {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0.5;
    transition: opacity var(--transition-normal);
}

.scroll-hint.faded {
    opacity: 0;
    pointer-events: none;
}

.hint-dot {
    display: block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--text-secondary);
    animation: pulseDot 2s ease-in-out infinite;
}

@keyframes pulseDot {
    0%,
    100% {
        opacity: 0.4;
        transform: scale(1);
    }
    50% {
        opacity: 1;
        transform: scale(1.8);
    }
}

/* ========== 内容区域 ========== */
.content-section {
    padding: 3rem 1.5rem 2rem;
    display: flex;
    justify-content: center;
}

.content-wrapper {
    width: 100%;
    max-width: var(--max-content-width);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* ========== 卡片 ========== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    padding: 1.6rem 1.8rem;
    transition: background var(--transition-normal), border-color var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(255, 255, 255, 0.11);
}

.card-icon {
    font-size: 1.6rem;
    margin-bottom: 0.4rem;
    line-height: 1;
}

.card-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}

.card-body {
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
}

.card-body p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.card-body p strong {
    color: var(--text-primary);
    font-weight: 600;
}

.text-muted {
    color: var(--text-muted) !important;
    font-size: 0.9rem;
}

/* ========== 代码块样式 ========== */
.code-block {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    background: var(--bg-code);
    color: var(--text-code);
    padding: 0.35em 0.85em;
    border-radius: var(--radius-sm);
    letter-spacing: 0.02em;
    border: 1px solid var(--border-subtle);
    word-break: break-all;
}

/* ========== 提示条 ========== */
.note {
    display: flex;
    align-items: flex-start;
    gap: 0.55rem;
    padding: 0.7rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    line-height: 1.5;
}

.note.warning {
    background: var(--bg-note-warning);
    border: 1px solid var(--border-note-warning);
    color: #e8c06a;
}

.note.info {
    background: var(--bg-note-info);
    border: 1px solid var(--border-note-info);
    color: #a8c8e8;
}

.note-icon {
    flex-shrink: 0;
    font-size: 1rem;
    line-height: 1.4;
}

.note code {
    font-family: var(--font-mono);
    background: rgba(255, 255, 255, 0.08);
    padding: 0.1em 0.4em;
    border-radius: 3px;
    font-size: 0.88em;
}

/* ========== 指令列表 ========== */
.cmd-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.cmd-item {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.55rem;
    padding: 0.55rem 0.75rem;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.015);
    transition: background var(--transition-fast);
}

.cmd-item:hover {
    background: rgba(255, 255, 255, 0.04);
}

.cmd-name {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-light);
    background: var(--accent-muted);
    padding: 0.25em 0.6em;
    border-radius: var(--radius-sm);
    white-space: nowrap;
    letter-spacing: 0.03em;
}

.cmd-desc {
    color: var(--text-secondary);
    font-size: 0.93rem;
    flex: 1;
    min-width: 120px;
}

.cmd-extra {
    color: var(--text-muted);
    font-size: 0.82rem;
}

.cmd-note-inline {
    display: inline-block;
    font-size: 0.78rem;
    color: #c09860;
    background: var(--bg-note-warning);
    padding: 0.2em 0.55em;
    border-radius: 50px;
    white-space: nowrap;
    margin-left: 0.3rem;
}

/* ========== persona 展开区域 ========== */
.cmd-item--expandable {
    flex-direction: column;
    align-items: stretch;
    padding: 0;
    background: transparent;
}

.cmd-item--expandable:hover {
    background: transparent;
}

.cmd-expand-trigger {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    width: 100%;
    padding: 0.55rem 0.75rem;
    background: rgba(255, 255, 255, 0.015);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    color: inherit;
    font: inherit;
    text-align: left;
    transition: background var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
    outline: none;
}

.cmd-expand-trigger:hover {
    background: rgba(255, 255, 255, 0.04);
}

.cmd-expand-trigger:focus-visible {
    outline: 2px solid var(--accent-light);
    outline-offset: 2px;
}

.expand-arrow {
    margin-left: auto;
    font-size: 0.85rem;
    color: var(--text-muted);
    transition: transform var(--transition-normal);
    display: inline-block;
    flex-shrink: 0;
}

.cmd-expand-trigger[aria-expanded="true"] .expand-arrow {
    transform: rotate(90deg);
}

.cmd-expand-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow), padding var(--transition-normal), opacity var(--transition-normal);
    opacity: 0;
    padding: 0 0.75rem;
}

.cmd-expand-content.expanded {
    max-height: 280px;
    opacity: 1;
    padding: 0.6rem 0.75rem 0.85rem;
}

.expand-intro,
.expand-example {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.35rem;
}

.expand-intro code,
.expand-example code {
    font-family: var(--font-mono);
    background: var(--bg-code);
    padding: 0.1em 0.45em;
    border-radius: 3px;
    font-size: 0.9em;
    color: var(--text-code);
}

.expand-available {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
    margin-top: 0.3rem;
}

.persona-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.persona-tag {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    color: #ffffff;
    background: var(--accent);
    padding: 0.3em 0.8em;
    border-radius: 50px;
    letter-spacing: 0.02em;
    transition: background var(--transition-fast);
}

/* ========== 联系方式卡片 ========== */
.card--contact {
    background: var(--bg-card);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 0.9rem;
}

.contact-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: 0.7rem 0.9rem;
    background: rgba(255, 255, 255, 0.025);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-subtle);
}

.contact-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.contact-value {
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 600;
    color: #ffffff;
    cursor: pointer;
    transition: color var(--transition-fast);
    word-break: break-all;
    -webkit-user-select: all;
    user-select: all;
    position: relative;
}

.contact-value:hover {
    color: var(--accent-light);
}

.contact-value:active {
    color: var(--accent);
}

.copy-feedback {
    text-align: center;
    font-size: 0.85rem;
    color: #6bcf7c;
    opacity: 0;
    transition: opacity var(--transition-normal);
    pointer-events: none;
    height: 0;
    overflow: hidden;
    margin: 0;
}

.copy-feedback.show {
    opacity: 1;
    height: auto;
    margin-top: 0.5rem;
}

/* ========== 页脚 ========== */
.footer {
    text-align: center;
    padding: 2.5rem 1.5rem 3rem;
    opacity: 0.7;
}

.footer-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.footer-sub {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .hero {
        padding: 1.5rem 1rem;
    }

    .hero-title {
        font-size: clamp(1.8rem, 7vw, 2.4rem);
    }

    .hero-subtitle {
        font-size: 0.95rem;
    }

    .btn-start {
        padding: 0.75rem 2rem;
        font-size: 0.95rem;
    }

    .content-section {
        padding: 2rem 1rem 1.5rem;
    }

    .card {
        padding: 1.3rem 1.2rem;
        border-radius: var(--radius-md);
    }

    .card-title {
        font-size: 1.1rem;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 0.6rem;
    }

    .cmd-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.35rem;
    }

    .cmd-desc {
        min-width: auto;
    }

    .cmd-note-inline {
        margin-left: 0;
        align-self: flex-start;
    }

    .cmd-expand-trigger {
        flex-wrap: wrap;
    }

    .code-block {
        font-size: 0.82rem;
        padding: 0.3em 0.65em;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 1rem 0.8rem;
    }

    .hero-badge {
        font-size: 0.7rem;
        padding: 0.3em 0.8em;
    }

    .hero-title {
        font-size: 1.6rem;
    }

    .hero-subtitle {
        font-size: 0.85rem;
    }

    .btn-start {
        padding: 0.7rem 1.6rem;
        font-size: 0.9rem;
        gap: 0.4rem;
    }

    .card {
        padding: 1rem 1rem;
    }

    .card-title {
        font-size: 1rem;
    }

    .card-body p {
        font-size: 0.88rem;
    }

    .content-wrapper {
        gap: 1rem;
    }

    .persona-tag {
        font-size: 0.78rem;
        padding: 0.25em 0.6em;
    }
}

/* ========== 辅助：减少动画偏好 ========== */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    .arrow-down {
        animation: none;
    }
    .btn-start {
        transition: none;
    }
    .cmd-expand-content {
        transition: none;
    }
    .scroll-hint {
        animation: none;
    }
    .hint-dot {
        animation: none;
    }
}