/* ==========================================================================
   翼云机场 yiyun.lol - Modern Memphis & Light Neumorphism Design System
   ========================================================================== */

:root {
    /* Memphis Vibrant Light Palette */
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --bg-card-alt: #f1f5f9;
    
    /* Vibrant Accent Colors (Image 1 & 4 inspired) */
    --primary-purple: #6366f1;
    --primary-hover: #4f46e5;
    --accent-pink: #ec4899;
    --accent-yellow: #f59e0b;
    --accent-cyan: #06b6d4;
    --accent-green: #10b981;
    --accent-blue: #3b82f6;
    
    /* Text colors */
    --text-dark: #0f172a;
    --text-medium: #334155;
    --text-muted: #64748b;
    --text-light: #94a3b8;
    
    /* Borders & Memphis Shadows */
    --border-dark: #0f172a;
    --border-light: #e2e8f0;
    --shadow-memphis: 5px 5px 0px #0f172a;
    --shadow-memphis-hover: 7px 7px 0px #0f172a;
    --shadow-soft: 0 10px 30px -10px rgba(0, 0, 0, 0.08);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.2);
    
    /* Radius */
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-full: 9999px;
    
    /* Font family */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    --font-heading: 'Outfit', 'Inter', sans-serif;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
    background-image: 
        radial-gradient(#e2e8f0 1.5px, transparent 1.5px),
        radial-gradient(#e2e8f0 1.5px, #f8fafc 1.5px);
    background-size: 30px 30px;
    background-position: 0 0, 15px 15px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--text-dark);
    line-height: 1.25;
}

a {
    color: inherit;
    text-decoration: none;
    transition: all 0.2s ease;
}

/* Memphis Dynamic Ornaments */
.memphis-shape {
    position: absolute;
    pointer-events: none;
    z-index: 0;
}

.shape-circle-red {
    width: 28px;
    height: 28px;
    background: #ef4444;
    border: 3px solid var(--border-dark);
    border-radius: 50%;
}

.shape-yellow-dot {
    width: 18px;
    height: 18px;
    background: var(--accent-yellow);
    border: 3px solid var(--border-dark);
    border-radius: 50%;
}

.shape-diamond-blue {
    width: 24px;
    height: 24px;
    background: var(--accent-blue);
    border: 3px solid var(--border-dark);
    transform: rotate(45deg);
}

.shape-triangle-green {
    width: 0;
    height: 0;
    border-left: 14px solid transparent;
    border-right: 14px solid transparent;
    border-bottom: 24px solid var(--accent-green);
}

/* Header & Navigation */
header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 3px solid var(--border-dark);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0.9rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--border-dark);
    letter-spacing: -0.5px;
}

.logo-badge {
    background: var(--primary-purple);
    color: #fff;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    border: 2px solid var(--border-dark);
}

.logo i {
    color: var(--primary-purple);
    font-size: 1.8rem;
    transform: rotate(-10deg);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    list-style: none;
}

.nav-item {
    position: relative;
}

.nav-link {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-dark);
    padding: 0.5rem 0.8rem;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-link:hover {
    color: var(--primary-purple);
    background: rgba(99, 102, 241, 0.08);
}

/* Dropdown Menu */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    background: #ffffff;
    border: 3px solid var(--border-dark);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-memphis);
    padding: 0.6rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.25s ease;
    z-index: 100;
}

.nav-item:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0.6rem 0.8rem;
    color: var(--text-dark);
    font-weight: 500;
    font-size: 0.9rem;
    border-radius: var(--radius-sm);
}

.dropdown-item:hover {
    background: var(--bg-card-alt);
    color: var(--primary-purple);
    transform: translateX(4px);
}

.dropdown-item i {
    width: 20px;
    text-align: center;
    color: var(--primary-purple);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Buttons */
.btn-memphis-primary {
    background: var(--accent-pink);
    color: #ffffff;
    font-weight: 700;
    font-size: 0.95rem;
    padding: 0.65rem 1.4rem;
    border: 3px solid var(--border-dark);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-memphis);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.15s ease;
}

.btn-memphis-primary:hover {
    transform: translate(-2px, -2px);
    box-shadow: var(--shadow-memphis-hover);
    background: #db2777;
}

.btn-memphis-primary:active {
    transform: translate(2px, 2px);
    box-shadow: 2px 2px 0px var(--border-dark);
}

.btn-memphis-purple {
    background: var(--primary-purple);
    color: #ffffff;
    font-weight: 700;
    font-size: 0.95rem;
    padding: 0.65rem 1.4rem;
    border: 3px solid var(--border-dark);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-memphis);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-memphis-purple:hover {
    transform: translate(-2px, -2px);
    box-shadow: var(--shadow-memphis-hover);
    background: var(--primary-hover);
}

.btn-memphis-yellow {
    background: var(--accent-yellow);
    color: var(--border-dark);
    font-weight: 700;
    font-size: 0.95rem;
    padding: 0.65rem 1.4rem;
    border: 3px solid var(--border-dark);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-memphis);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-memphis-outline {
    background: #ffffff;
    color: var(--text-dark);
    font-weight: 700;
    font-size: 0.95rem;
    padding: 0.65rem 1.4rem;
    border: 3px solid var(--border-dark);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-memphis);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-memphis-outline:hover {
    background: var(--bg-card-alt);
    transform: translate(-2px, -2px);
    box-shadow: var(--shadow-memphis-hover);
}

.btn-search {
    width: 42px;
    height: 42px;
    border: 3px solid var(--border-dark);
    border-radius: 50%;
    background: #ffffff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    box-shadow: 3px 3px 0px var(--border-dark);
    transition: all 0.15s ease;
}

.btn-search:hover {
    background: var(--accent-yellow);
    transform: translate(-2px, -2px);
    box-shadow: 5px 5px 0px var(--border-dark);
}

/* Sections General Layout */
section {
    padding: 4.5rem 1.5rem;
    max-width: 1280px;
    margin: 0 auto;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 3.5rem;
}

.section-tag {
    display: inline-block;
    background: #e0e7ff;
    color: var(--primary-purple);
    font-weight: 800;
    font-size: 0.85rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    padding: 0.3rem 1rem;
    border-radius: var(--radius-full);
    border: 2px solid var(--border-dark);
    margin-bottom: 0.8rem;
    box-shadow: 2px 2px 0px var(--border-dark);
}

.section-title {
    font-size: 2.2rem;
    letter-spacing: -0.5px;
    margin-bottom: 0.8rem;
}

.section-desc {
    color: var(--text-muted);
    font-size: 1.05rem;
    max-width: 650px;
    margin: 0 auto;
}

/* Hero Section & Dashboard Layout */
.hero-wrapper {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 2.5rem;
    align-items: center;
    min-height: 540px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #fef3c7;
    color: #b45309;
    font-size: 0.85rem;
    font-weight: 700;
    padding: 0.4rem 1rem;
    border: 2px solid var(--border-dark);
    border-radius: var(--radius-full);
    box-shadow: 3px 3px 0px var(--border-dark);
    margin-bottom: 1.5rem;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 1.2rem;
}

.hero-title .highlight {
    color: var(--primary-purple);
    position: relative;
    display: inline-block;
}

.hero-title .highlight::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 0;
    width: 100%;
    height: 12px;
    background: rgba(245, 158, 11, 0.35);
    z-index: -1;
    transform: rotate(-1deg);
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--text-medium);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.hero-stats {
    display: flex;
    gap: 2rem;
    padding-top: 1.5rem;
    border-top: 2px dashed var(--border-light);
}

.stat-item h4 {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--primary-purple);
}

.stat-item p {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 600;
}

/* Dashboard Mockup Card */
.dashboard-card {
    background: #ffffff;
    border: 3px solid var(--border-dark);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-memphis);
    padding: 1.5rem;
    position: relative;
}

.dashboard-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--bg-card-alt);
    margin-bottom: 1.2rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--accent-pink);
    border: 2px solid var(--border-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 800;
}

.user-details h4 {
    font-size: 0.95rem;
}

.user-details p {
    font-size: 0.8rem;
    color: var(--accent-green);
    font-weight: 700;
}

.traffic-chart-box {
    background: var(--bg-card-alt);
    border: 2px solid var(--border-dark);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-bottom: 1.2rem;
}

.chart-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 0.8rem;
}

.chart-bar-bg {
    height: 14px;
    background: #e2e8f0;
    border-radius: var(--radius-full);
    border: 2px solid var(--border-dark);
    overflow: hidden;
}

.chart-bar-fill {
    height: 100%;
    width: 38%;
    background: linear-gradient(90deg, var(--primary-purple), var(--accent-pink));
    border-radius: var(--radius-full);
}

.chart-details {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    font-weight: 600;
}

/* Node List Card */
.node-preview-list {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.node-item {
    background: #ffffff;
    border: 2px solid var(--border-dark);
    border-radius: var(--radius-sm);
    padding: 0.6rem 0.8rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.85rem;
    font-weight: 600;
}

.node-flag {
    display: flex;
    align-items: center;
    gap: 8px;
}

.node-flag span {
    font-size: 1.2rem;
}

.node-ping {
    display: flex;
    align-items: center;
    gap: 8px;
}

.ping-badge {
    background: #dcfce7;
    color: #15803d;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.75rem;
    border: 1px solid var(--border-dark);
}

.multiplier-badge {
    background: #e0e7ff;
    color: var(--primary-purple);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.75rem;
    border: 1px solid var(--border-dark);
}

/* Node List Section (Full Interactive Grid) */
.nodes-control-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

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

.filter-tag {
    background: #ffffff;
    border: 2px solid var(--border-dark);
    padding: 0.4rem 0.9rem;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.15s ease;
}

.filter-tag.active, .filter-tag:hover {
    background: var(--primary-purple);
    color: #ffffff;
    box-shadow: 2px 2px 0px var(--border-dark);
}

.nodes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.2rem;
}

.node-card-full {
    background: #ffffff;
    border: 3px solid var(--border-dark);
    border-radius: var(--radius-md);
    padding: 1.1rem;
    box-shadow: var(--shadow-memphis);
    transition: all 0.15s ease;
    position: relative;
}

.node-card-full:hover {
    transform: translate(-3px, -3px);
    box-shadow: var(--shadow-memphis-hover);
}

.node-card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.8rem;
}

.node-name {
    font-weight: 800;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.node-card-meta {
    display: flex;
    gap: 0.5rem;
    font-size: 0.8rem;
    margin-bottom: 1rem;
}

.node-card-actions {
    display: flex;
    gap: 0.5rem;
}

/* Pricing Section - Image 2 Inspired Grid */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    align-items: stretch;
}

.pricing-card {
    background: #ffffff;
    border: 3px solid var(--border-dark);
    border-radius: var(--radius-lg);
    padding: 2.2rem 1.8rem;
    box-shadow: var(--shadow-memphis);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    background-image: linear-gradient(to right, rgba(99, 102, 241, 0.05) 1px, transparent 1px),
                      linear-gradient(to bottom, rgba(99, 102, 241, 0.05) 1px, transparent 1px);
    background-size: 20px 20px;
    transition: all 0.2s ease;
}

.pricing-card:hover {
    transform: translateY(-5px);
    box-shadow: 8px 8px 0px var(--border-dark);
}

.pricing-card.featured {
    border: 4px solid var(--primary-purple);
    box-shadow: 7px 7px 0px var(--border-dark);
    background-color: #f8fafc;
}

.featured-badge {
    position: absolute;
    top: -16px;
    right: 20px;
    background: var(--primary-purple);
    color: #ffffff;
    font-size: 0.8rem;
    font-weight: 800;
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    border: 2px solid var(--border-dark);
    box-shadow: 2px 2px 0px var(--border-dark);
}

.plan-code {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-light);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 0.4rem;
}

.plan-name {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 0.4rem;
}

.plan-sub {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1.8rem;
}

.pricing-features {
    list-style: none;
    margin-bottom: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-medium);
}

.pricing-features li i {
    color: var(--accent-green);
    font-size: 1.1rem;
}

.plan-price-box {
    margin-bottom: 1.8rem;
    padding-top: 1rem;
    border-top: 2px dashed var(--border-light);
}

.plan-price {
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--text-dark);
    font-family: var(--font-heading);
}

.plan-price span {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 600;
}

/* Tutorials & Quick Download Grid */
.tutorials-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.tutorial-card {
    background: #ffffff;
    border: 3px solid var(--border-dark);
    border-radius: var(--radius-md);
    padding: 1.8rem 1.2rem;
    text-align: center;
    box-shadow: var(--shadow-memphis);
    transition: all 0.15s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
}

.tutorial-card:hover {
    transform: translate(-3px, -3px);
    box-shadow: var(--shadow-memphis-hover);
}

.tutorial-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: 3px solid var(--border-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.icon-win { background: #dbeafe; color: #2563eb; }
.icon-mac { background: #f3e8ff; color: #9333ea; }
.icon-android { background: #dcfce7; color: #16a34a; }
.icon-ios { background: #ffe4e6; color: #e11d48; }

.tutorial-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.4rem;
}

.tutorial-card p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1.2rem;
}

/* Articles Section Grid */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.8rem;
}

.article-card {
    background: #ffffff;
    border: 3px solid var(--border-dark);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    box-shadow: var(--shadow-memphis);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: all 0.15s ease;
}

.article-card:hover {
    transform: translate(-3px, -3px);
    box-shadow: var(--shadow-memphis-hover);
}

.article-tag {
    display: inline-block;
    background: #fef3c7;
    color: #b45309;
    font-size: 0.75rem;
    font-weight: 800;
    padding: 2px 8px;
    border: 1px solid var(--border-dark);
    border-radius: 4px;
    margin-bottom: 0.8rem;
    align-self: flex-start;
}

.article-card h3 {
    font-size: 1.1rem;
    line-height: 1.4;
    margin-bottom: 0.8rem;
}

.article-card h3 a:hover {
    color: var(--primary-purple);
}

.article-card p {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin-bottom: 1.2rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-light);
    font-weight: 600;
    padding-top: 0.8rem;
    border-top: 1px dashed var(--border-light);
}

/* FAQ Accordion Section */
.faq-grid {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq-item {
    background: #ffffff;
    border: 3px solid var(--border-dark);
    border-radius: var(--radius-md);
    box-shadow: 4px 4px 0px var(--border-dark);
    overflow: hidden;
}

.faq-question {
    padding: 1.2rem 1.5rem;
    font-weight: 700;
    font-size: 1.05rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

.faq-question i {
    transition: transform 0.3s ease;
    color: var(--primary-purple);
}

.faq-answer {
    padding: 0 1.5rem 1.2rem 1.5rem;
    color: var(--text-medium);
    font-size: 0.95rem;
    line-height: 1.6;
    display: none;
}

.faq-item.active .faq-answer {
    display: block;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

/* User Reviews Section */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.review-card {
    background: #ffffff;
    border: 3px solid var(--border-dark);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    box-shadow: var(--shadow-memphis);
}

.review-stars {
    color: var(--accent-yellow);
    margin-bottom: 0.8rem;
    font-size: 0.9rem;
}

.review-card p {
    font-size: 0.92rem;
    color: var(--text-medium);
    margin-bottom: 1.2rem;
    font-style: italic;
}

.review-user {
    display: flex;
    align-items: center;
    gap: 10px;
}

.review-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid var(--border-dark);
    background: #e2e8f0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
}

/* Search Modal Drawer */
.search-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(6px);
    z-index: 2000;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding-top: 10vh;
    opacity: 0;
    visibility: hidden;
    transition: all 0.25s ease;
}

.search-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.search-modal-content {
    background: #ffffff;
    border: 4px solid var(--border-dark);
    border-radius: var(--radius-lg);
    box-shadow: 8px 8px 0px var(--border-dark);
    width: 90%;
    max-width: 680px;
    padding: 1.8rem;
    position: relative;
}

.search-input-box {
    display: flex;
    align-items: center;
    gap: 10px;
    border: 3px solid var(--border-dark);
    border-radius: var(--radius-md);
    padding: 0.8rem 1rem;
    background: var(--bg-card-alt);
    margin-bottom: 1.5rem;
}

.search-input-box input {
    border: none;
    background: transparent;
    width: 100%;
    font-size: 1.1rem;
    font-weight: 600;
    outline: none;
    color: var(--text-dark);
}

.hot-keywords {
    margin-top: 1rem;
}

.hot-keywords h4 {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.8rem;
}

.hot-keyword-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.hot-keyword-chip {
    background: #ffffff;
    border: 2px solid var(--border-dark);
    padding: 0.3rem 0.8rem;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.15s ease;
}

.hot-keyword-chip:hover {
    background: var(--accent-yellow);
    transform: translateY(-2px);
    box-shadow: 2px 2px 0px var(--border-dark);
}

/* Footer */
footer {
    background: #ffffff;
    border-top: 4px solid var(--border-dark);
    padding: 4rem 1.5rem 2rem 1.5rem;
    margin-top: 4rem;
}

.footer-container {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin: 1rem 0;
}

.footer-links h4 {
    font-size: 1.1rem;
    margin-bottom: 1.2rem;
}

.footer-links ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
}

.footer-links a {
    color: var(--text-medium);
    font-size: 0.9rem;
    font-weight: 500;
}

.footer-links a:hover {
    color: var(--primary-purple);
}

.footer-bottom {
    max-width: 1280px;
    margin: 0 auto;
    padding-top: 2rem;
    border-top: 2px dashed var(--border-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    flex-wrap: wrap;
    gap: 1rem;
}

/* Responsive Rules */
@media (max-width: 1024px) {
    .hero-wrapper { grid-template-columns: 1fr; }
    .pricing-grid { grid-template-columns: 1fr; }
    .tutorials-grid { grid-template-columns: repeat(2, 1fr); }
    .articles-grid { grid-template-columns: repeat(2, 1fr); }
    .reviews-grid { grid-template-columns: 1fr; }
    .footer-container { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .nav-menu { display: none; }
    .tutorials-grid { grid-template-columns: 1fr; }
    .articles-grid { grid-template-columns: 1fr; }
    .footer-container { grid-template-columns: 1fr; }
    .hero-title { font-size: 2.2rem; }
}