/* 
 * Number.Net Styles
 * Modern, clean interface for numerical tools
 */

/* === Base Styles and Variables === */
:root {
    /* Color Palette */
    --color-primary: #3563E9;     /* Main brand blue */
    --color-primary-light: #4B7BFF;
    --color-primary-dark: #2447C0;
    --color-accent: #FF6B35;      /* Orange accent */
    --color-text: #333333;        /* Main text color */
    --color-text-light: #666666;  /* Secondary text */
    --color-background: #F5F7FA;  /* Light background */
    --color-white: #FFFFFF;
    --color-card: #FFFFFF;        /* Card background */
    --color-card-hover: #F8FAFF;  /* Card hover state */
    --color-border: #E5E9F0;      /* Subtle borders */
    --color-shadow: rgba(0, 0, 0, 0.08);
    
    /* Typography */
    --font-heading: 'Poppins', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;

    /* Spacing */
    --spacing-xs: 0.25rem;   /* 4px */
    --spacing-sm: 0.5rem;    /* 8px */
    --spacing-md: 1rem;      /* 16px */
    --spacing-lg: 1.5rem;    /* 24px */
    --spacing-xl: 2rem;      /* 32px */
    --spacing-xxl: 3rem;     /* 48px */
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05), 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-focus: 0 0 0 3px rgba(53, 99, 233, 0.4);
}

/* === Reset and Base Styles === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    padding-top: 80px; /* Added padding for fixed header */
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover, a:focus {
    color: var(--color-primary-dark);
}

button {
    cursor: pointer;
    font-family: var(--font-body);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-text);
}

img {
    max-width: 100%;
    height: auto;
}

/* === Header & Navigation === */
header {
    background-color: var(--color-white);
    position: fixed; /* Changed from sticky to fixed */
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: var(--shadow-md);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-sm) 0;
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    height: 80px;
    position: relative;
}

.logo {
    display: flex;
    align-items: center;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.6rem;
    color: var(--color-text);
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    margin-right: var(--spacing-sm);
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-md);
}

.logo-accent {
    color: var(--color-primary);
}

.tagline {
    display: none;
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-left: var(--spacing-lg);
}

.menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    color: var(--color-text);
    font-size: 1.2rem;
    z-index: 101;
}

.menu-toggle.active {
    color: var(--color-primary);
}

.main-nav {
    position: absolute;
    top: 70px;
    right: 0;
    left: 0;
    background-color: var(--color-white);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    border-top: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.main-nav.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
}

.main-nav ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.nav-link {
    display: flex;
    align-items: center;
    color: var(--color-text);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link i {
    margin-right: var(--spacing-sm);
    color: var(--color-primary);
}

.nav-link:hover, .nav-link:focus {
    background-color: var(--color-card-hover);
    color: var(--color-primary);
}

/* === Hero Section === */
.hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    padding: var(--spacing-xxl) 0;
    text-align: center;
    box-shadow: var(--shadow-md);
}

.hero h1 {
    font-size: 2.8rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-white);
}

.hero .subtitle {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
}

.trademark {
    font-size: 0.9rem;
    vertical-align: super;
    margin-left: var(--spacing-xs);
}

/* Search container removed as requested */

.quick-access {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.quick-access p {
    font-size: 0.9rem;
    opacity: 0.9;
}

.quick-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
}

.quick-button {
    background-color: rgba(255, 255, 255, 0.2);
    color: var(--color-white);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.quick-button:hover, .quick-button:focus {
    background-color: rgba(255, 255, 255, 0.3);
    color: var(--color-white);
}

/* === Main Content & Tool Sections === */
main {
    padding: var(--spacing-xl) 0 var(--spacing-xxl);
}

.tool-section {
    margin-bottom: var(--spacing-lg);
}

.category-block {
    padding: var(--spacing-xl) var(--spacing-lg);
    margin: 0 -var(--spacing-lg) var(--spacing-xl);
    border-radius: var(--radius-lg);
}

/* Alternating background colors for categories */
.category-block:nth-child(odd) {
    background-color: rgba(245, 247, 250, 0.7);
}

.category-block:nth-child(even) {
    background-color: rgba(235, 240, 247, 0.5);
}

#converters.category-block {
    background-color: rgba(76, 175, 80, 0.05);
}

#calculators.category-block {
    background-color: rgba(249, 168, 38, 0.05);
}

#generators.category-block {
    background-color: rgba(156, 39, 176, 0.05);
}

#telephone-tools.category-block {
    background-color: rgba(33, 150, 243, 0.05);
}

.section-header {
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.section-header h2 {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.section-header h2 i {
    margin-right: var(--spacing-sm);
    color: var(--color-primary);
}

.section-header p {
    color: var(--color-text-light);
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.tool-card {
    display: flex;
    align-items: center;
    background-color: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    color: var(--color-text);
}

.tool-card:hover, .tool-card:focus {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary-light);
    background-color: var(--color-card-hover);
    color: var(--color-text);
}

.tool-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    min-width: 50px;
    height: 50px;
    border-radius: var(--radius-md);
    margin-right: var(--spacing-lg);
    background-color: var(--color-primary);
    color: var(--color-white);
    font-size: 1.2rem;
}

#converters .tool-icon {
    background-color: #4CAF50; /* Green */
}

#calculators .tool-icon {
    background-color: #F9A826; /* Yellow/Orange */
}

#generators .tool-icon {
    background-color: #9C27B0; /* Purple */
}

#telephone-tools .tool-icon {
    background-color: #2196F3; /* Blue */
}

.tool-content {
    flex: 1;
}

.tool-content h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
}

.tool-content p {
    font-size: 0.9rem;
    color: var(--color-text-light);
}

.card-action {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    opacity: 1; /* Changed from 0 to make always visible */
    transform: translateX(0); /* Changed from -10px to make always visible */
    transition: all var(--transition-normal);
}

#converters .card-action {
    color: #4CAF50;
}

#calculators .card-action {
    color: #F9A826;
}

#generators .card-action {
    color: #9C27B0;
}

#telephone-tools .card-action {
    color: #2196F3;
}

.view-all {
    display: inline-block;
    text-align: center;
    font-weight: 500;
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: rgba(255, 255, 255, 0.7);
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
    transition: all var(--transition-fast);
}

.view-all i {
    font-size: 0.8rem;
    margin-left: var(--spacing-xs);
    transition: transform var(--transition-fast);
}

.view-all:hover {
    background-color: var(--color-white);
    box-shadow: var(--shadow-sm);
}

.view-all:hover i {
    transform: translateX(3px);
}

/* Centering the view all button */
.tool-section {
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* === About Section === */
.about-section {
    background-color: var(--color-white);
    padding: var(--spacing-xxl) 0;
    border-top: 1px solid var(--color-border);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-content h2 {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-lg);
}

.about-content p {
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-light);
}

.about-stats {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    min-width: 180px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
    font-family: var(--font-heading);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--color-text-light);
    text-align: center;
}

/* === Footer === */
footer {
    background-color: #2D3748;
    color: rgba(255, 255, 255, 0.7);
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
    font-size: 0.9rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-col h3 {
    color: var(--color-white);
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
}

.footer-col h4 {
    color: var(--color-white);
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
}

.footer-col p {
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--color-white);
    transition: all var(--transition-fast);
}

.social-links a:hover, .social-links a:focus {
    background-color: var(--color-primary);
    color: var(--color-white);
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-col ul a {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
}

.footer-col ul a:hover, .footer-col ul a:focus {
    color: var(--color-white);
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
}

.footer-links a:hover, .footer-links a:focus {
    color: var(--color-white);
}

/* === Media Queries === */
@media (min-width: 576px) {
    .tool-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 768px) {
    .tagline {
        display: block;
    }
    
    .menu-toggle {
        display: none;
    }
    
    .header-container {
        justify-content: space-between;
    }
    
    .logo {
        flex: 0 0 auto;
    }
    
    .main-nav {
        position: static;
        transform: none;
        padding: 0;
        box-shadow: none;
        border-top: none;
        opacity: 1;
        visibility: visible;
        flex: 1 0 auto;
        display: flex;
        justify-content: center;
    }
    
    .main-nav ul {
        flex-direction: row;
        gap: var(--spacing-xl);
        justify-content: center;
    }

    .nav-link {
        font-size: 1.05rem;
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .footer-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }

    .hero h1 {
        font-size: 3.2rem;
    }
    
    .hero .subtitle {
        font-size: 1.5rem;
    }
}

@media (min-width: 992px) {
    .tool-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .hero h1 {
        font-size: 3.5rem;
    }
    
    .hero .subtitle {
        font-size: 1.6rem;
    }
}

@media (max-width: 767px) {
    .tool-card {
        flex-direction: column;
        text-align: center;
    }
    
    .tool-icon {
        margin-right: 0;
        margin-bottom: var(--spacing-md);
    }
    
    .card-action {
        display: none;
    }
    
    body {
        padding-top: 70px; /* Smaller padding for mobile */
    }
}

/* === Utilities === */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* === Home Page Specific Styles === */
.home-hero {
    background: linear-gradient(135deg, #3563E9 0%, #2447C0 100%);
    padding: var(--spacing-xxl) 0 calc(var(--spacing-xxl) * 1.5);
    margin-bottom: var(--spacing-xl);
}

.home-hero h1 {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-xl);
}

.home-hero .subtitle {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-xl);
}

/* Active nav item */
.nav-link.active {
    background-color: var(--color-card-hover);
    color: var(--color-primary);
    font-weight: 600;
}