/* ==========================================================================
   webvk.in Homepage Stylesheet
   Author: WebVK
   ========================================================================== */

/* --- Design Tokens --- */
:root {
    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'Fira Code', 'Courier New', Courier, monospace;

    /* Charcoal Dark Mode Palette by default */
    --bg-app: #12161a;
    --bg-surface: #1e242b;
    --bg-surface-alt: #242d36;
    --bg-header: rgba(18, 22, 26, 0.85);
    
    --border-color: #2e3b48;
    --border-color-hover: #3e4f60;
    --border-color-focus: #e11d48;
    
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --text-light: #64748b;
    
    --primary: #e11d48; /* Red Accent */
    --primary-hover: #be123c;
    --primary-light: rgba(225, 29, 72, 0.15);
    
    --success: #10b981;
    --success-hover: #059669;
    
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4), 0 2px 4px -1px rgba(0,0,0,0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(225, 29, 72, 0.25);
    
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    --transition-fast: 0.12s ease;
    --transition-normal: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme overrides */
[data-theme="light"] {
    --bg-app: #f4f6f8;
    --bg-surface: #ffffff;
    --bg-surface-alt: #f8fafc;
    --bg-header: rgba(244, 246, 248, 0.85);
    
    --border-color: #cbd5e1;
    --border-color-hover: #94a3b8;
    
    --text-main: #0f172a;
    --text-muted: #475569;
    --text-light: #64748b;
    
    --primary-light: #fff1f2;
    
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
    --shadow-glow: 0 0 20px rgba(225, 29, 72, 0.15);
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-app);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition-normal);
}

/* Scrollbars */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--border-color-hover);
}

/* Layout */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background-color: var(--bg-header);
    backdrop-filter: blur(12px);
    z-index: 100;
    transition: border-color var(--transition-normal);
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 10px;
}

.brand-logo {
    height: 52px;
    width: auto;
    border-radius: var(--radius-sm);
    display: block;
    background-color: #ffffff;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    padding: 1px;
}

.logo-separator {
    color: var(--text-light);
    font-weight: 600;
}

.logo-tool-name {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 800;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

.nav-links {
    display: flex;
    gap: 10px;
}

.nav-item-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}
.nav-item-link:hover {
    color: var(--text-main);
    border-color: var(--border-color-hover);
    background-color: var(--bg-surface-alt);
}

/* Hero Section */
.hero-section {
    padding: 60px 0 40px 0;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 25px;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 800;
    color: var(--text-main);
    line-height: 1.2;
}

.hero-subtitle {
    color: var(--text-muted);
    font-size: 1.15rem;
    max-width: 720px;
    margin: 0 auto;
}

/* Instant Search Input */
.search-box-container {
    width: 100%;
    max-width: 580px;
    margin-top: 10px;
}

.search-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    background-color: var(--bg-surface);
    border: 2px solid var(--border-color);
    border-radius: 50px;
    padding: 0 20px;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}
.search-input-wrapper:focus-within {
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.search-icon {
    color: var(--text-light);
    width: 22px;
    height: 22px;
    margin-right: 12px;
    flex-shrink: 0;
}

.search-input-wrapper input {
    width: 100%;
    height: 52px;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-main);
    font-family: var(--font-body);
    font-size: 1.05rem;
}

/* Filter categories tabs */
.filter-tabs-container {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.filter-tab {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.9rem;
    padding: 8px 18px;
    border-radius: 50px;
    cursor: pointer;
    transition: all var(--transition-fast);
    outline: none;
}
.filter-tab:hover {
    color: var(--text-main);
    border-color: var(--border-color-hover);
}
.filter-tab.active {
    background-color: var(--primary);
    border-color: var(--primary);
    color: #ffffff;
    box-shadow: var(--shadow-glow);
}

/* Tools Grid Layout */
.tools-grid-section {
    margin-bottom: 60px;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
}

/* Tool card styles */
.tool-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}
.tool-card:hover {
    transform: translateY(-3px);
    border-color: var(--border-color-hover);
    box-shadow: var(--shadow-md);
}

.card-icon-bg {
    background-color: var(--primary-light);
    color: var(--primary);
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}
.card-icon-bg i {
    width: 24px;
    height: 24px;
}

.tool-card h4 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-main);
}

.tool-card p {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
    flex-grow: 1; /* Pushes button to bottom */
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.92rem;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all var(--transition-fast);
    gap: 8px;
    outline: none;
    text-decoration: none;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.8rem;
    border-radius: var(--radius-sm);
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1rem;
    border-radius: var(--radius-md);
}

.btn-red {
    background-color: var(--primary);
    color: #ffffff;
}
.btn-red:hover {
    background-color: var(--primary-hover);
}

.btn-icon {
    width: 38px;
    height: 38px;
    padding: 0;
    border-radius: 50%;
    border-color: var(--border-color);
    background-color: var(--bg-surface);
    color: var(--text-muted);
}
.btn-icon:hover {
    color: var(--text-main);
    border-color: var(--border-color-hover);
}

.btn-glow {
    box-shadow: var(--shadow-glow);
}

/* SEO Content Section */
.seo-content-section {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 50px;
}

.seo-article {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.seo-article h2 {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text-main);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

.seo-article h3 {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-main);
    margin-top: 15px;
}

.seo-article p {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.seo-article strong {
    color: var(--text-main);
}

.seo-article ul {
    margin-left: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 0.95rem;
    color: var(--text-muted);
}

.seo-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-top: 10px;
}

.seo-text-block {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* Footer */
.app-footer {
    border-top: 1px solid var(--border-color);
    padding: 24px 0;
    margin-top: auto;
    font-size: 0.9rem;
    color: var(--text-muted);
}
.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.footer-brand {
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}
.footer-brand:hover {
    text-decoration: underline;
}
.footer-links {
    display: flex;
    align-items: center;
    gap: 12px;
}
.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
}
.footer-links a:hover {
    color: var(--text-main);
    text-decoration: underline;
}

/* Responsive queries */
@media (max-width: 950px) {
    .seo-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

@media (max-width: 600px) {
    .app-header {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }
    .header-actions {
        width: 100%;
        justify-content: space-between;
    }
    .hero-title {
        font-size: 2.2rem;
    }
    .footer-content {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
    .seo-content-section {
        padding: 20px;
    }
}