* {margin: 0;padding: 0;box-sizing: border-box;}
:root {
    --orange-50: #fff7ed;
    --orange-100: #ffedd5;
    --orange-200: #fed7aa;
    --orange-400: #fb923c;
    --orange-500: #f97316;
    --orange-600: #ea580c;
    --orange-700: #c2410c;
    --orange-800: #9a3412;
    --orange-gradient: linear-gradient(120deg, var(--orange-400), var(--orange-500));
    --orange-gradient-light: linear-gradient(120deg, var(--orange-100), var(--orange-50));
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --white: #ffffff;
    --shadow-sm: 0 2px 4px rgba(249, 115, 22, 0.05);
    --shadow-md: 0 4px 12px rgba(249, 115, 22, 0.1);
    --shadow-lg: 0 8px 24px rgba(249, 115, 22, 0.15);
    --radius-xs: 4px;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;
    --transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    --border-light: 1px solid var(--orange-100);
    --border-main: 1px solid var(--orange-400);
}
body {
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--orange-50);
    color: var(--gray-800);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.8;
    background-image: radial-gradient(var(--orange-100) 1px, transparent 1px);
    background-size: 20px 20px;
}
header {
    background-color: var(--white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
    background-color: rgba(255, 255, 255, 0.9);
    display: flex;
    justify-content: center;
}
.header-inner {
    width: 92%;
    max-width: 1024px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 0;
}
.logo {
    font-size: 22px;
    font-weight: 800;
    background: var(--orange-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-fill-color: transparent;
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: -0.5px;
}
.logo-icon {
    font-size: 26px;
    background: var(--orange-gradient);
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
}
.menu-icon {
    font-size: 24px;
    color: var(--orange-500);
    display: block;
    cursor: pointer;
    transition: var(--transition);
    padding: 4px 8px;
    border-radius: var(--radius-xs);
}
.menu-icon:hover {
    color: var(--orange-700);
    background-color: var(--orange-100);
}
.nav {
    display: none;
}
@media (min-width: 768px) {
    .nav {
        display: block;
    }
    .menu-icon {
        display: none;
    }
    .logo {
        font-size: 26px;
    }
    .logo-icon {
        font-size: 30px;
        width: 40px;
        height: 40px;
    }
}
@media (min-width: 1024px) {
    .nav ul {
        gap: 40px;
    }
}
.nav ul {
    display: flex;
    gap: 20px;
    list-style: none;
}
.nav a {
    text-decoration: none;
    color: var(--gray-700);
    font-weight: 600;
    font-size: 14px;
    transition: var(--transition);
    padding: 6px 10px;
    border-radius: var(--radius-xs);
    position: relative;
}
@media (min-width: 768px) {
    .nav a {
        font-size: 15px;
        padding: 8px 12px;
    }
}
.nav a:hover {
    color: var(--orange-600);
    background-color: var(--orange-50);
}
.nav .active {
    color: var(--orange-600);
    background-color: var(--orange-50);
}
.container {
    width: 92%;
    max-width: 1024px;
    margin: 0 auto;
    padding: 0 8px;
}
main {
    flex: 1;
    padding: 20px 0;
}
@media (min-width: 768px) {
    main {
        padding: 40px 0;
    }
}
.breadcrumbs {
    font-size: 13px;
    color: var(--gray-700);
    margin-bottom: 16px;
    padding: 6px 10px;
    background-color: var(--white);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
}
@media (min-width: 768px) {
    .breadcrumbs {
        font-size: 14px;
        margin-bottom: 24px;
        padding: 8px 12px;
    }
}
.breadcrumbs a {
    color: var(--orange-500);
    text-decoration: none;
    font-weight: 600;
}
.breadcrumbs a:hover {
    text-decoration: none;
}
.section {
    background-color: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 20px;
    margin-bottom: 20px;
    transition: var(--transition);
    border: var(--border-light);
    position: relative;
    overflow: hidden;
}
@media (min-width: 576px) {
    .section {
        padding: 28px;
        margin-bottom: 28px;
    }
}
@media (min-width: 768px) {
    .section {
        padding: 40px;
        margin-bottom: 36px;
    }
}
.section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--orange-gradient);
}
.section:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    border-color: var(--orange-400);
}
.section h2 {
    font-size: 24px;
    font-weight: 800;
    background: var(--orange-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-fill-color: transparent;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 12px;
    letter-spacing: -0.5px;
}
@media (min-width: 576px) {
    .section h2 {
        font-size: 28px;
        margin-bottom: 24px;
        padding-bottom: 14px;
    }
}
@media (min-width: 768px) {
    .section h2 {
        font-size: 32px;
        margin-bottom: 28px;
        padding-bottom: 16px;
    }
}
.section h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--orange-gradient);
    border-radius: var(--radius-full);
}
@media (min-width: 768px) {
    .section h2::after {
        width: 80px;
    }
}
.section h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--orange-700);
    margin: 20px 0 14px;
    display: flex;
    align-items: center;
    gap: 6px;
}
@media (min-width: 768px) {
    .section h3 {
        font-size: 24px;
        margin: 24px 0 18px;
        gap: 8px;
    }
}
.section h3::before {
    content: '';
    width: 4px;
    height: 18px;
    background: var(--orange-gradient);
    border-radius: var(--radius-full);
}
@media (min-width: 768px) {
    .section h3::before {
        height: 20px;
    }
}
.section h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--orange-500);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 4px;
}
@media (min-width: 768px) {
    .section h4 {
        font-size: 18px;
        margin-bottom: 12px;
        gap: 6px;
    }
}
.section h4::before {
    content: '●';
    color: var(--orange-400);
    font-size: 10px;
}
@media (min-width: 768px) {
    .section h4::before {
        font-size: 12px;
    }
}
.ip-card {
    background: var(--orange-gradient-light);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    margin-bottom: 16px;
    color: var(--orange-800);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    border: 1px solid var(--orange-200);
}
@media (min-width: 768px) {
    .ip-card {
        padding: 16px 20px;
        margin-bottom: 20px;
    }
}
.ip-card::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 0 0 0 var(--radius-lg);
}
@media (min-width: 768px) {
    .ip-card::after {
        width: 60px;
        height: 60px;
    }
}
.ip-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}
.ip-card p {
    font-size: 14px;
    margin-bottom: 4px;
    font-weight: 500;
    color: var(--orange-700);
}
@media (min-width: 576px) {
    .ip-card p {
        font-size: 15px;
    }
}
@media (min-width: 768px) {
    .ip-card p {
        font-size: 16px;
        margin-bottom: 6px;
    }
}
.ip-value {
    font-size: 16px;
    font-weight: 700;
    letter-spacing: 0.5px;
    word-break: break-all;
}
@media (min-width: 576px) {
    .ip-value {
        font-size: 18px;
    }
}
@media (min-width: 768px) {
    .ip-value {
        font-size: 20px;
    }
}
.btn {
    background: var(--orange-gradient);
    color: var(--white);
    border: none;
    border-radius: var(--radius-sm);
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    margin: 8px 0;
    letter-spacing: 0.5px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    width: 100%;
    justify-content: center;
}
@media (min-width: 576px) {
    .btn {
        padding: 11px 24px;
        font-size: 14px;
        width: auto;
    }
}
@media (min-width: 768px) {
    .btn {
        padding: 12px 28px;
        font-size: 15px;
        gap: 8px;
    }
}
.btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    filter: brightness(1.05);
}
.btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
    filter: brightness(0.95);
}
.text-content {
    font-size: 14px;
    margin-bottom: 16px;
    text-align: justify;
    color: var(--gray-700);
    line-height: 1.7;
}
@media (min-width: 768px) {
    .text-content {
        font-size: 15px;
        margin-bottom: 20px;
        line-height: 1.8;
    }
}
.highlight {
    color: var(--orange-700);
    font-weight: 700;
    background-color: var(--orange-50);
    padding: 2px 6px;
    border-radius: var(--radius-xs);
}
.tool-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    margin-top: 20px;
}
@media (min-width: 576px) {
    .tool-grid {
        gap: 20px;
        margin-top: 24px;
    }
}
@media (min-width: 768px) {
    .tool-grid {
        grid-template-columns: 1fr 1fr;
        gap: 28px;
        margin-top: 30px;
    }
}
.tool-card {
    background: var(--orange-gradient-light);
    border-radius: var(--radius-md);
    padding: 18px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: var(--border-light);
    position: relative;
    overflow: hidden;
}
@media (min-width: 576px) {
    .tool-card {
        padding: 20px;
    }
}
@media (min-width: 768px) {
    .tool-card {
        padding: 24px;
    }
}
.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--orange-gradient);
}
.tool-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: var(--orange-400);
}
.tool-card h3 {
    font-size: 16px;
    color: var(--orange-700);
    margin-bottom: 14px;
    text-align: center;
    font-weight: 700;
    padding-bottom: 10px;
    border-bottom: var(--border-light);
}
@media (min-width: 768px) {
    .tool-card h3 {
        font-size: 18px;
        margin-bottom: 18px;
        padding-bottom: 12px;
    }
}
.tool-card input {
    width: 100%;
    padding: 10px 14px;
    border: var(--border-main);
    border-radius: var(--radius-sm);
    font-size: 14px;
    margin-bottom: 14px;
    transition: var(--transition);
    background-color: var(--white);
    color: var(--gray-800);
}
@media (min-width: 768px) {
    .tool-card input {
        padding: 12px 16px;
        font-size: 15px;
        margin-bottom: 18px;
    }
}
.tool-card input:focus {
    outline: none;
    border-color: var(--orange-500);
    box-shadow: 0 0 0 4px rgba(249, 115, 22, 0.1);
}
.result-text {
    font-size: 14px;
    color: var(--orange-700);
    font-weight: 700;
    margin-top: 16px;
    min-height: 32px;
    text-align: center;
    padding: 6px;
    border-radius: var(--radius-xs);
    background-color: var(--orange-50);
}
@media (min-width: 768px) {
    .result-text {
        font-size: 16px;
        margin-top: 20px;
        padding: 8px;
    }
}
.faq-item {
    margin-bottom: 16px;
    border-bottom: var(--border-light);
    padding-bottom: 16px;
    transition: var(--transition);
}
@media (min-width: 768px) {
    .faq-item {
        margin-bottom: 24px;
        padding-bottom: 20px;
    }
}
.faq-item:hover {
    background-color: var(--orange-50);
    padding: 8px;
    margin: 0 -8px 16px -8px;
    border-radius: var(--radius-sm);
}
@media (min-width: 768px) {
    .faq-item:hover {
        padding: 12px;
        margin: 0 -12px 24px -12px;
    }
}
.footer {
    background: var(--white);
    padding: 20px 0 16px;
    text-align: center;
    color: var(--gray-700);
    border-top: 3px solid var(--orange-500);
    margin-top: 20px;
    box-shadow: 0 -2px 8px var(--shadow-sm);
    display: flex;
    justify-content: center;
}
@media (min-width: 768px) {
    .footer {
        padding: 40px 0 20px;
        margin-top: 40px;
    }
}
.footer-inner {
    width: 92%;
    max-width: 1024px;
}
.footer p {
    margin-bottom: 8px;
    font-size: 14px;
}
@media (min-width: 768px) {
    .footer p {
        margin-bottom: 12px;
        font-size: 15px;
    }
}
.footer p:last-child {
    font-size: 12px;
    color: var(--gray-500);
    margin-bottom: 0;
    padding-top: 8px;
    border-top: var(--border-light);
}
@media (min-width: 768px) {
    .footer p:last-child {
        font-size: 13px;
        padding-top: 12px;
    }
}
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--orange-gradient);
    color: var(--white);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    z-index: 99;
}
.back-to-top.show {
    opacity: 1;
    visibility: visible;
}
.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    filter: brightness(1.1);
}
.back-to-top:active {
    transform: translateY(0);
    filter: brightness(0.95);
}
@media (max-width: 768px) {
    .back-to-top {
        width: 44px;
        height: 44px;
        font-size: 20px;
        bottom: 20px;
        right: 20px;
    }
}