*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Roboto, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
            line-height: 1.7;
            color: #1e1e2f;
            background: #f8f9fc;
            padding: 0 1rem;
        }
        a {
            color: #d13639;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover,
        a:focus-visible {
            color: #a12326;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: #0f1923;
            margin-top: 1.8rem;
            margin-bottom: 0.6rem;
        }
        h1 {
            font-size: 2.2rem;
            margin-top: 0.5rem;
            border-left: 6px solid #d13639;
            padding-left: 1rem;
        }
        h2 {
            font-size: 1.7rem;
            border-bottom: 2px solid #e8e8f0;
            padding-bottom: 0.3rem;
        }
        h3 {
            font-size: 1.35rem;
        }
        h4 {
            font-size: 1.1rem;
            color: #2a2a40;
        }
        p {
            margin-bottom: 1.2rem;
            color: #2d2d44;
        }
        ul,
        ol {
            margin-bottom: 1.2rem;
            padding-left: 1.6rem;
        }
        li {
            margin-bottom: 0.4rem;
        }
        strong {
            color: #0f1923;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            font-size: 0.95rem;
            background: #fff;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
        }
        th,
        td {
            padding: 0.75rem 1rem;
            text-align: left;
            border-bottom: 1px solid #eef0f5;
        }
        th {
            background: #0f1923;
            color: #fff;
            font-weight: 600;
        }
        tr:last-child td {
            border-bottom: none;
        }
        tr:hover td {
            background: #f4f6fb;
        }
        blockquote {
            background: #f0f2f8;
            border-left: 5px solid #d13639;
            padding: 1rem 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 12px 12px 0;
            font-style: italic;
            color: #2a2a40;
        }
        code {
            background: #e8ecf4;
            padding: 0.2rem 0.5rem;
            border-radius: 6px;
            font-size: 0.9rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: #fff;
            box-shadow: 0 0 40px rgba(0, 0, 0, 0.03);
            border-radius: 24px;
            padding: 1.5rem 2rem 2rem;
        }
        @media (max-width:600px) {
            .container {
                padding: 1rem 1rem 1.5rem;
                border-radius: 16px;
            }
            h1 {
                font-size: 1.6rem;
                padding-left: 0.7rem;
            }
            h2 {
                font-size: 1.3rem;
            }
            h3 {
                font-size: 1.1rem;
            }
        }
        .site-header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 0.8rem 0 1rem;
            border-bottom: 2px solid #eef0f5;
            position: relative;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: #0f1923;
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .my-logo i {
            color: #d13639;
            font-size: 1.6rem;
        }
        .my-logo span {
            color: #d13639;
        }
        .my-logo:hover {
            text-decoration: none;
            color: #0f1923;
        }
        .my-logo small {
            font-size: 0.7rem;
            font-weight: 400;
            color: #6b7280;
            display: block;
            letter-spacing: 0.3px;
        }
        .main-nav {
            display: flex;
            gap: 0.2rem;
            flex-wrap: wrap;
            align-items: center;
        }
        .main-nav a {
            padding: 0.5rem 0.9rem;
            font-weight: 500;
            font-size: 0.9rem;
            color: #1e1e2f;
            border-radius: 30px;
            transition: background 0.2s, color 0.2s;
        }
        .main-nav a:hover,
        .main-nav a:focus-visible {
            background: #d13639;
            color: #fff;
            text-decoration: none;
        }
        .main-nav a i {
            margin-right: 0.35rem;
            font-size: 0.8rem;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.6rem;
            color: #0f1923;
            cursor: pointer;
            padding: 0.2rem 0.4rem;
            border-radius: 8px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: #f0f2f8;
        }
        #nav-toggle {
            display: none;
        }
        @media (max-width:768px) {
            .hamburger {
                display: block;
            }
            .main-nav {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #fff;
                padding: 1rem 0 0.5rem;
                border-top: 1px solid #eef0f5;
                margin-top: 0.8rem;
            }
            .main-nav a {
                width: 100%;
                padding: 0.6rem 1rem;
                border-radius: 10px;
            }
            #nav-toggle:checked~.main-nav {
                display: flex;
            }
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            padding: 0.8rem 0 0.2rem;
            margin: 0;
            font-size: 0.82rem;
            color: #6b7280;
        }
        .breadcrumb li {
            margin-right: 0.3rem;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 0.4rem;
            color: #9ca3af;
        }
        .breadcrumb a {
            color: #6b7280;
        }
        .breadcrumb a:hover {
            color: #d13639;
        }
        .breadcrumb .active {
            color: #1e1e2f;
            font-weight: 500;
        }
        .search-section {
            background: #f4f6fb;
            border-radius: 16px;
            padding: 1.5rem 2rem;
            margin: 1.8rem 0;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 1rem;
        }
        .search-section label {
            font-weight: 600;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            color: #0f1923;
        }
        .search-form {
            display: flex;
            flex: 1;
            min-width: 200px;
            gap: 0.5rem;
        }
        .search-form input {
            flex: 1;
            padding: 0.7rem 1rem;
            border: 2px solid #dce0e8;
            border-radius: 30px;
            font-size: 0.95rem;
            outline: none;
            transition: border 0.2s;
        }
        .search-form input:focus {
            border-color: #d13639;
        }
        .search-form button {
            background: #d13639;
            color: #fff;
            border: none;
            padding: 0.7rem 1.4rem;
            border-radius: 30px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .search-form button:hover {
            background: #a12326;
            transform: scale(0.97);
        }
        @media (max-width:600px) {
            .search-section {
                padding: 1.2rem 1rem;
                flex-direction: column;
                align-items: stretch;
            }
            .search-form button {
                justify-content: center;
            }
        }
        .calc-card {
            background: linear-gradient(135deg, #0f1923 0%, #1a2a3a 100%);
            color: #fff;
            border-radius: 20px;
            padding: 2rem 2rem 2.5rem;
            margin: 2rem 0;
            box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15);
        }
        .calc-card h2,
        .calc-card h3,
        .calc-card label {
            color: #fff;
        }
        .calc-card h2 {
            border-bottom-color: rgba(255, 255, 255, 0.15);
        }
        .calc-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem 2rem;
            margin-top: 1.2rem;
        }
        .calc-field {
            display: flex;
            flex-direction: column;
            gap: 0.3rem;
        }
        .calc-field label {
            font-weight: 500;
            font-size: 0.9rem;
            opacity: 0.9;
        }
        .calc-field input,
        .calc-field select {
            padding: 0.7rem 1rem;
            border: none;
            border-radius: 10px;
            font-size: 1rem;
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.15);
            transition: background 0.2s;
        }
        .calc-field input:focus,
        .calc-field select:focus {
            background: rgba(255, 255, 255, 0.2);
            outline: none;
            border-color: #d13639;
        }
        .calc-field input::placeholder {
            color: rgba(255, 255, 255, 0.5);
        }
        .calc-field select option {
            color: #0f1923;
        }
        .calc-result {
            grid-column: 1 / -1;
            background: rgba(255, 255, 255, 0.08);
            border-radius: 14px;
            padding: 1.2rem 1.5rem;
            text-align: center;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        .calc-result .big-number {
            font-size: 2.6rem;
            font-weight: 800;
            color: #ff6b6b;
            display: block;
            line-height: 1.2;
        }
        .calc-result .unit {
            font-size: 1rem;
            opacity: 0.8;
        }
        .calc-result .detail-row {
            display: flex;
            justify-content: center;
            gap: 2rem;
            flex-wrap: wrap;
            margin-top: 0.8rem;
            font-size: 0.95rem;
        }
        .calc-result .detail-row span {
            background: rgba(255, 255, 255, 0.07);
            padding: 0.3rem 1rem;
            border-radius: 20px;
        }
        .btn-calc {
            background: #d13639;
            color: #fff;
            border: none;
            padding: 0.8rem 2rem;
            border-radius: 30px;
            font-weight: 700;
            font-size: 1.05rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            grid-column: 1 / -1;
            justify-self: center;
            min-width: 200px;
        }
        .btn-calc:hover {
            background: #a12326;
            transform: scale(0.97);
        }
        @media (max-width:700px) {
            .calc-grid {
                grid-template-columns: 1fr;
                gap: 1rem;
            }
            .calc-card {
                padding: 1.5rem 1.2rem;
            }
            .calc-result .big-number {
                font-size: 2rem;
            }
        }
        .featured-image {
            margin: 2rem 0;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.06);
        }
        .featured-image figure {
            position: relative;
        }
        .featured-image figcaption {
            background: rgba(15, 25, 35, 0.85);
            color: #f0f2f8;
            padding: 0.6rem 1.2rem;
            font-size: 0.85rem;
            text-align: center;
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.8rem;
            margin: 2.2rem 0;
        }
        .feedback-card {
            background: #f8f9fc;
            border-radius: 16px;
            padding: 1.5rem 1.8rem;
            border: 1px solid #eef0f5;
            transition: box-shadow 0.2s;
        }
        .feedback-card:hover {
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.04);
        }
        .feedback-card h3 {
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 1.2rem;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 0.2rem;
            margin: 0.6rem 0 0.8rem;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 1.8rem;
            color: #dce0e8;
            cursor: pointer;
            transition: color 0.15s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f59e0b;
        }
        .feedback-card textarea {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 2px solid #dce0e8;
            border-radius: 12px;
            font-size: 0.95rem;
            font-family: inherit;
            resize: vertical;
            min-height: 80px;
            transition: border 0.2s;
        }
        .feedback-card textarea:focus {
            border-color: #d13639;
            outline: none;
        }
        .feedback-card .btn-submit {
            background: #0f1923;
            color: #fff;
            border: none;
            padding: 0.6rem 1.6rem;
            border-radius: 30px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
            margin-top: 0.6rem;
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
        }
        .feedback-card .btn-submit:hover {
            background: #d13639;
        }
        @media (max-width:700px) {
            .feedback-grid {
                grid-template-columns: 1fr;
                gap: 1.2rem;
            }
            .feedback-card {
                padding: 1.2rem 1rem;
            }
        }
        friend-link {
            display: block;
            background: #f4f6fb;
            border-radius: 16px;
            padding: 1.5rem 2rem;
            margin: 2rem 0 1.2rem;
            border: 1px solid #e8ecf4;
        }
        friend-link h3 {
            margin-top: 0;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            color: #0f1923;
        }
        friend-link ul {
            list-style: none;
            padding: 0;
            display: flex;
            flex-wrap: wrap;
            gap: 0.6rem 1.5rem;
            margin-top: 0.6rem;
        }
        friend-link li a {
            font-size: 0.9rem;
            color: #2d2d44;
            background: #fff;
            padding: 0.3rem 1rem;
            border-radius: 20px;
            border: 1px solid #dce0e8;
            transition: background 0.2s, color 0.2s;
            display: inline-block;
        }
        friend-link li a:hover {
            background: #d13639;
            color: #fff;
            text-decoration: none;
            border-color: #d13639;
        }
        .site-footer {
            border-top: 2px solid #eef0f5;
            padding-top: 1.5rem;
            margin-top: 1.5rem;
            text-align: center;
            color: #6b7280;
            font-size: 0.85rem;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 0.8rem;
        }
        .site-footer .copyright {
            font-weight: 400;
        }
        .site-footer .copyright strong {
            color: #0f1923;
        }
        .site-footer a {
            color: #6b7280;
        }
        .site-footer a:hover {
            color: #d13639;
        }
        @media (max-width:600px) {
            .site-footer {
                flex-direction: column;
                text-align: center;
            }
            friend-link {
                padding: 1.2rem 1rem;
            }
            friend-link ul {
                flex-direction: column;
                gap: 0.4rem;
            }
        }
        .last-updated {
            font-size: 0.82rem;
            color: #9ca3af;
            display: flex;
            align-items: center;
            gap: 0.4rem;
            margin-bottom: 0.8rem;
        }
        .last-updated i {
            font-size: 0.75rem;
        }
        .tag {
            display: inline-block;
            background: #d13639;
            color: #fff;
            font-size: 0.7rem;
            font-weight: 600;
            padding: 0.15rem 0.7rem;
            border-radius: 20px;
            letter-spacing: 0.3px;
            text-transform: uppercase;
        }
        .emoji-big {
            font-size: 1.3rem;
        }
        .highlight-box {
            background: #fef3c7;
            border-radius: 12px;
            padding: 1rem 1.5rem;
            border-left: 5px solid #f59e0b;
            margin: 1.5rem 0;
        }
        .highlight-box p {
            margin-bottom: 0.2rem;
        }
        .two-col {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
            margin: 1.5rem 0;
        }
        @media (max-width:600px) {
            .two-col {
                grid-template-columns: 1fr;
                gap: 1rem;
            }
        }
        section {
            scroll-margin-top: 1rem;
        }
        :focus-visible {
            outline: 3px solid #d13639;
            outline-offset: 2px;
        }
        @media (prefers-reduced-motion: reduce) {
            *,
            *::before,
            *::after {
                animation-duration: 0.01ms !important;
                transition-duration: 0.01ms !important;
            }
        }