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

:root {
    --color-primary: #0052CC;
    --color-primary-dark: #0747A6;
    --color-primary-light: #4C9AFF;
    --color-text: #172B4D;
    --color-text-secondary: #5E6C84;
    --color-text-light: #7A869A;
    --color-bg: #FFFFFF;
    --color-bg-secondary: #F4F5F7;
    --color-bg-sidebar: #FAFBFC;
    --color-border: #DFE1E6;
    --color-border-light: #EBECF0;
    --color-success: #00B884;
    --color-warning: #FFAB00;
    --color-error: #DE350B;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    --sidebar-width: 320px;
    --header-height: 64px;
    --max-content-width: 900px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.08);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background: var(--color-bg-secondary);
    min-height: 100vh;
}

/* HEADER */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.header-inner {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 8px;
}

.header-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.header-logo-img {
    height: 32px;
    width: auto;
}

.logo-divider {
    color: var(--color-border);
    margin: 0 8px;
}

.logo-sub {
    font-weight: 400;
    font-size: 14px;
    color: var(--color-text-secondary);
}

.language-selector {
    display: flex;
    gap: 4px;
    background: var(--color-bg-secondary);
    padding: 4px;
    border-radius: 6px;
    border: 1px solid var(--color-border-light);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.swidoc-logo {
    height: 24px;
    width: auto;
}

/* Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    padding: 4px;
    border: none;
    background: transparent;
    cursor: pointer;
    border-radius: 4px;
    transition: background 0.2s;
}

.hamburger:hover {
    background: rgba(0, 0, 0, 0.04);
}

.hamburger span {
    display: block;
    height: 2px;
    background: var(--color-text-secondary);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.hamburger.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.hamburger.open span:nth-child(2) {
    opacity: 0;
}

.hamburger.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Sidebar overlay */
.sidebar-overlay {
    display: none;
}

.lang-btn {
    padding: 4px 12px;
    border: none;
    background: transparent;
    border-radius: 4px;
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-family);
}

.lang-btn:hover {
    color: var(--color-text);
    background: rgba(0, 0, 0, 0.04);
}

.lang-btn.active {
    background: var(--color-primary);
    color: white;
}

.lang-btn.active:hover {
    background: var(--color-primary-dark);
}

/* APP CONTAINER */
.app-container {
    display: flex;
    margin-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
}

/* MAIN CONTENT */
.main-content {
    flex: 1;
    padding: 40px 48px 80px;
    background: var(--color-bg);
    min-height: calc(100vh - var(--header-height));
}

.content-wrapper {
    max-width: var(--max-content-width);
    margin: 0 auto;
}

/* GUIDE SECTIONS */
.guide-section {
    margin-bottom: 48px;
    padding: 0 4px;
}

.section-header {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin-bottom: 20px;
}

.step-number {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-primary);
    background: rgba(0, 82, 204, 0.08);
    padding: 2px 12px;
    border-radius: 4px;
    white-space: nowrap;
}

.section-header h2 {
    font-size: 24px;
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: -0.3px;
    margin: 0;
}

.step-content {
    padding-left: 4px;
}

.step-content p {
    font-size: 16px;
    color: var(--color-text-secondary);
    margin-bottom: 16px;
    max-width: 700px;
}

/* Screenshot */
.screenshot-container {
    margin: 20px 0 24px;
    border-radius: 8px;
    border: 1px solid var(--color-border-light);
    overflow: hidden;
    background: var(--color-bg-secondary);
    box-shadow: var(--shadow-sm);
}

.screenshot {
    width: 100%;
    height: auto;
    display: block;
}

.screenshot-caption {
    padding: 12px 16px;
    font-size: 14px;
    color: var(--color-text-secondary);
    background: var(--color-bg);
    border-top: 1px solid var(--color-border-light);
    display: flex;
    align-items: center;
    gap: 8px;
}

.screenshot-caption i {
    color: var(--color-text-light);
}

/* Step Instructions */
.step-instructions {
    margin: 16px 0;
}

.step-instructions ol {
    padding-left: 24px;
    color: var(--color-text-secondary);
}

.step-instructions ol li {
    margin-bottom: 6px;
    font-size: 15px;
}

.step-instructions strong {
    color: var(--color-text);
}

/* Boxes */
.tip-box,
.warning-box,
.success-box {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px 20px;
    border-radius: 6px;
    margin: 20px 0;
    border-left: 4px solid;
}

.tip-box {
    background: #EBF5FF;
    border-color: var(--color-primary-light);
}

.tip-box i {
    color: var(--color-primary-light);
    font-size: 18px;
    margin-top: 2px;
}

.warning-box {
    background: #FFF8E6;
    border-color: var(--color-warning);
}

.warning-box i {
    color: var(--color-warning);
    font-size: 18px;
    margin-top: 2px;
}

.success-box {
    background: #E6F9F2;
    border-color: var(--color-success);
}

.success-box i {
    color: var(--color-success);
    font-size: 18px;
    margin-top: 2px;
}

.tip-box div,
.warning-box div,
.success-box div {
    flex: 1;
}

.tip-box strong,
.warning-box strong,
.success-box strong {
    color: var(--color-text);
}

.section-divider {
    border: none;
    border-top: 1px solid var(--color-border-light);
    margin: 40px 0;
}

/* SIDEBAR */
.sidebar {
    width: var(--sidebar-width);
    min-height: calc(100vh - var(--header-height));
    background: var(--color-bg-sidebar);
    border-right: 1px solid var(--color-border);
    position: sticky;
    top: var(--header-height);
    height: calc(100vh - var(--header-height));
    overflow-y: auto;
    flex-shrink: 0;
    padding: 24px 0;
}

.sidebar::-webkit-scrollbar {
    width: 4px;
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.sidebar-header {
    padding: 0 20px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--color-border-light);
}

.sidebar-header h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.step-counter {
    font-size: 12px;
    color: var(--color-text-light);
    background: var(--color-bg-secondary);
    padding: 2px 10px;
    border-radius: 12px;
}

.nav-list {
    list-style: none;
    padding: 12px 0;
    flex: 1;
}

.nav-section {
    margin-bottom: 4px;
}

.section-label {
    display: block;
    padding: 8px 20px;
    font-size: 11px;
    font-weight: 600;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-items {
    list-style: none;
}

.nav-link {
    display: block;
    padding: 6px 20px 6px 36px;
    font-size: 14px;
    color: var(--color-text-secondary);
    border-left: 2px solid transparent;
    transition: all 0.15s ease;
    cursor: pointer;
    text-decoration: none;
}

.nav-link:hover {
    color: var(--color-text);
    background: rgba(0, 82, 204, 0.05);
    text-decoration: none;
}

.nav-link.active {
    color: var(--color-primary);
    border-left-color: var(--color-primary);
    background: rgba(0, 82, 204, 0.06);
    font-weight: 500;
}

/* Sidebar Footer */
.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--color-border-light);
    margin-top: auto;
}

.progress-indicator {
    margin-top: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.progress-indicator span {
    font-size: 12px;
    color: var(--color-text-light);
}

.progress-bar {
    flex: 1;
    height: 4px;
    background: var(--color-border);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--color-primary);
    border-radius: 4px;
    transition: width 0.3s ease;
}

#progressText {
    font-weight: 500;
    color: var(--color-text);
    min-width: 36px;
    text-align: right;
}



@media (max-width: 1024px) {
    .sidebar {
        width: 280px;
    }

    .main-content {
        padding: 32px 32px 60px;
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        z-index: 900;
        background: rgba(0, 0, 0, 0.4);
    }

    .sidebar-overlay.open {
        display: block;
    }

    .sidebar {
        position: fixed;
        top: var(--header-height);
        left: -100%;
        width: 300px;
        max-width: 85vw;
        height: calc(100vh - var(--header-height));
        z-index: 950;
        transition: left 0.3s ease;
        border-right: 1px solid var(--color-border);
        border-top: 1px solid var(--color-border);
        padding: 20px 0;
    }

    .sidebar.open {
        left: 0;
    }

    .sidebar-nav {
        max-height: none;
        overflow-y: auto;
    }

    .app-container {
        flex-direction: column;
    }

    .main-content {
        padding: 24px 20px 40px;
    }

    .header-inner {
        flex-wrap: wrap;
        gap: 8px;
        padding: 0 16px;
    }

    .logo-sub {
        display: none;
    }

    .section-header h2 {
        font-size: 20px;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: 16px 12px 32px;
    }

    .language-selector {
        gap: 2px;
    }

    .lang-btn {
        padding: 2px 8px;
        font-size: 12px;
    }

    .section-header {
        flex-wrap: wrap;
    }

    .section-header h2 {
        font-size: 18px;
    }

    .tip-box,
    .warning-box,
    .success-box {
        padding: 12px 16px;
        font-size: 14px;
    }

    .sidebar {
        width: 85vw;
    }
}



/* Footer */
footer {
    border-top: 2px solid #332A7C;
    padding: 48px 40px 24px;
    color: #333;
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px;
    align-items: start;
}

.footer-logo img {
    width: 160px;
    max-width: 100%;
}

.footer-block a {
    display: block;
    color: #332A7C;
    text-decoration: none;
    font-size: 14px;
    line-height: 2;
}

.footer-block a:hover {
    text-decoration: underline;
}

.footer-block strong {
    display: block;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: #332A7C;
    margin-bottom: 6px;
}

.footer-block {
    font-size: 14px;
    line-height: 1.7;
    color: #555;
}

.footer-bottom {
    text-align: center;
    margin-top: 36px;
    padding-top: 16px;
    border-top: 1px solid #e0dce6;
    font-size: 12px;
    color: #999;
}

@media screen and (max-width: 768px) {
    footer {
        padding: 32px 24px 20px;
    }

    .footer-inner {
        grid-template-columns: 1fr 1fr;
    }

    .footer-logo {
        grid-column: 1 / -1;
    }
}

@media screen and (max-width: 480px) {
    .footer-inner {
        grid-template-columns: 1fr;
    }
}