*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, Roboto, 'Helvetica Neue', sans-serif;
            background: #0e0b16;
            color: #e8e0f0;
            line-height: 1.8;
            min-height: 100vh;
        }
        a {
            color: #c084fc;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: #e9d5ff;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        ul,
        ol {
            padding-left: 1.5rem;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: #f3e8ff;
            margin-top: 1.8rem;
            margin-bottom: 0.6rem;
        }
        h1 {
            font-size: 2.4rem;
            margin-top: 0.5rem;
            border-bottom: 3px solid #7c3aed;
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 1.8rem;
            border-left: 5px solid #7c3aed;
            padding-left: 0.9rem;
            margin-top: 2.5rem;
        }
        h3 {
            font-size: 1.4rem;
            color: #ddd6fe;
        }
        h4 {
            font-size: 1.15rem;
            color: #c4b5fd;
            font-weight: 600;
        }
        p {
            margin-bottom: 1rem;
            font-size: 1.05rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.2rem;
        }
        .bg-dark-card {
            background: #1a1426;
            border-radius: 16px;
            padding: 1.8rem 1.5rem;
            margin: 1.5rem 0;
            border: 1px solid #2d1f4a;
        }
        .bg-gradient-purple {
            background: linear-gradient(135deg, #2e1065, #4c1d95);
            color: #fff;
        }
        .badge {
            display: inline-block;
            background: #7c3aed;
            color: #fff;
            padding: 0.2rem 0.9rem;
            border-radius: 30px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.3px;
        }
        .highlight {
            color: #c084fc;
            font-weight: 600;
        }
        .emoji-big {
            font-size: 1.6rem;
            margin-right: 0.3rem;
        }
        .site-header {
            background: #120c1c;
            border-bottom: 2px solid #2d1f4a;
            padding: 0.6rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            backdrop-filter: blur(12px);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.6);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.7rem;
            font-weight: 800;
            background: linear-gradient(135deg, #c084fc, #a78bfa);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            gap: 0.3rem;
        }
        .my-logo i {
            -webkit-text-fill-color: initial;
            color: #c084fc;
            font-size: 1.8rem;
        }
        .my-logo:hover {
            opacity: 0.9;
            text-decoration: none;
        }
        .my-logo small {
            font-size: 0.7rem;
            -webkit-text-fill-color: initial;
            color: #9ca3af;
            font-weight: 400;
            letter-spacing: 0.2px;
            display: block;
        }
        .nav-list {
            display: flex;
            list-style: none;
            gap: 0.2rem;
            align-items: center;
            flex-wrap: wrap;
        }
        .nav-list a {
            display: block;
            padding: 0.5rem 0.9rem;
            border-radius: 30px;
            font-size: 0.9rem;
            font-weight: 500;
            color: #d4c4f0;
            transition: background 0.2s, color 0.2s;
        }
        .nav-list a:hover {
            background: #2d1f4a;
            color: #f3e8ff;
            text-decoration: none;
        }
        .nav-list a.active {
            background: #7c3aed;
            color: #fff;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: #e8e0f0;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.2rem 0.5rem;
            border-radius: 8px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: #2d1f4a;
        }
        #nav-toggle {
            display: none;
        }
        #nav-toggle:checked~.nav-wrapper .nav-list {
            display: flex;
            flex-direction: column;
            width: 100%;
            background: #1a1426;
            padding: 1rem 0.5rem;
            border-radius: 16px;
            margin-top: 0.8rem;
            border: 1px solid #2d1f4a;
        }
        #nav-toggle:checked~.nav-wrapper .nav-list a {
            padding: 0.7rem 1rem;
            border-radius: 8px;
        }
        .nav-wrapper {
            display: flex;
            align-items: center;
        }
        .breadcrumb {
            padding: 0.7rem 0 0.3rem;
            font-size: 0.85rem;
            color: #9ca3af;
            display: flex;
            flex-wrap: wrap;
            gap: 0.3rem 0.1rem;
        }
        .breadcrumb a {
            color: #a78bfa;
        }
        .breadcrumb span {
            margin: 0 0.2rem;
        }
        .search-box {
            display: flex;
            max-width: 520px;
            margin: 1.2rem 0 1.8rem;
            border-radius: 50px;
            overflow: hidden;
            border: 1px solid #2d1f4a;
            background: #1a1426;
        }
        .search-box input {
            flex: 1;
            padding: 0.8rem 1.2rem;
            border: none;
            background: transparent;
            color: #f3e8ff;
            font-size: 1rem;
            outline: none;
        }
        .search-box input::placeholder {
            color: #7c7a8a;
        }
        .search-box button {
            background: #7c3aed;
            color: #fff;
            border: none;
            padding: 0 1.5rem;
            font-size: 1.1rem;
            cursor: pointer;
            transition: background 0.2s;
        }
        .search-box button:hover {
            background: #6d28d9;
        }
        .toc {
            background: #1a1426;
            border-radius: 16px;
            padding: 1.5rem 1.8rem;
            border: 1px solid #2d1f4a;
            margin: 1.5rem 0 2rem;
        }
        .toc h3 {
            margin-top: 0;
            font-size: 1.3rem;
        }
        .toc ul {
            list-style: none;
            padding-left: 0;
            columns: 2 240px;
            column-gap: 2rem;
        }
        .toc li {
            padding: 0.25rem 0;
            break-inside: avoid;
        }
        .toc a {
            display: inline-block;
            padding: 0.2rem 0;
        }
        .toc a::before {
            content: "▸ ";
            color: #7c3aed;
        }
        .feedback-forms {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
            margin: 2rem 0;
        }
        @media (max-width: 700px) {
            .feedback-forms {
                grid-template-columns: 1fr;
            }
        }
        .feedback-card {
            background: #1a1426;
            border-radius: 16px;
            padding: 1.5rem 1.2rem;
            border: 1px solid #2d1f4a;
        }
        .feedback-card h3 {
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .feedback-card form {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
            margin-top: 0.8rem;
        }
        .feedback-card input,
        .feedback-card textarea,
        .feedback-card select {
            background: #0e0b16;
            border: 1px solid #2d1f4a;
            border-radius: 10px;
            padding: 0.7rem 1rem;
            color: #f3e8ff;
            font-size: 0.95rem;
            outline: none;
            transition: border 0.2s;
        }
        .feedback-card input:focus,
        .feedback-card textarea:focus,
        .feedback-card select:focus {
            border-color: #7c3aed;
        }
        .feedback-card textarea {
            min-height: 80px;
            resize: vertical;
        }
        .feedback-card .btn-submit {
            background: #7c3aed;
            color: #fff;
            border: none;
            padding: 0.7rem 1.2rem;
            border-radius: 30px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
            align-self: flex-start;
        }
        .feedback-card .btn-submit:hover {
            background: #6d28d9;
        }
        .content-image {
            margin: 1.8rem 0;
            border-radius: 14px;
            overflow: hidden;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
            background: #1a1426;
            padding: 0.5rem;
        }
        .content-image figcaption {
            padding: 0.6rem 0.8rem 0.2rem;
            font-size: 0.85rem;
            color: #a78bfa;
            text-align: center;
            font-style: italic;
        }
        friend-link {
            display: block;
            margin: 1rem 0;
            padding: 1rem 0;
            border-top: 1px solid #2d1f4a;
            border-bottom: 1px solid #2d1f4a;
        }
        friend-link a {
            display: inline-block;
            margin: 0.3rem 0.8rem 0.3rem 0;
        }
        .site-footer {
            background: #0c0912;
            border-top: 2px solid #2d1f4a;
            padding: 2rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-inner {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 1rem;
        }
        .footer-copy {
            color: #9ca3af;
            font-size: 0.85rem;
        }
        .footer-copy a {
            color: #c084fc;
        }
        @media (max-width: 850px) {
            .hamburger {
                display: block;
            }
            .nav-list {
                display: none;
                width: 100%;
            }
            .header-inner {
                align-items: center;
            }
            .nav-wrapper {
                order: 3;
                width: 100%;
            }
            #nav-toggle:checked~.nav-wrapper .nav-list {
                display: flex;
            }
            .toc ul {
                columns: 1;
            }
            h1 {
                font-size: 1.9rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            h3 {
                font-size: 1.2rem;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 0.9rem;
            }
            .my-logo {
                font-size: 1.3rem;
            }
            .search-box input {
                padding: 0.6rem 0.9rem;
                font-size: 0.9rem;
            }
            .feedback-card {
                padding: 1rem 0.9rem;
            }
        }
        .last-updated {
            color: #9ca3af;
            font-size: 0.85rem;
            border-top: 1px dashed #2d1f4a;
            padding-top: 0.8rem;
            margin-top: 1.2rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .inline-list {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem 1.2rem;
            list-style: none;
            padding-left: 0;
        }
        .inline-list li::before {
            content: "✦ ";
            color: #7c3aed;
        }
        .key-point {
            background: #2d1f4a;
            border-left: 4px solid #7c3aed;
            padding: 0.8rem 1.2rem;
            border-radius: 0 12px 12px 0;
            margin: 1rem 0;
        }
        .key-point i {
            color: #c084fc;
            margin-right: 0.5rem;
        }
        .btn-back-top {
            position: fixed;
            bottom: 1.5rem;
            right: 1.5rem;
            background: #7c3aed;
            color: #fff;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            box-shadow: 0 4px 20px rgba(124, 58, 237, 0.4);
            transition: transform 0.2s, background 0.2s;
            z-index: 999;
            border: none;
            cursor: pointer;
        }
        .btn-back-top:hover {
            transform: scale(1.08);
            background: #6d28d9;
        }
        @media (max-width: 600px) {
            .btn-back-top {
                width: 40px;
                height: 40px;
                font-size: 1.1rem;
                bottom: 1rem;
                right: 1rem;
            }
        }
        .schema-hidden {
            display: none;
        }