@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&family=Inter:wght@400;500;600&display=swap');

:root {
    --primary-color: #7C4DFF;
    --primary-hover: #651FFF;
    --text-color: #2d3436;
    --bg-color: #f7f7ff;
    --card-bg: white;
    --border-color: #e6e6ff;
    --header-bg: #5E35B1;
    --footer-bg: #4527A0;
    --shadow-color: rgba(124, 77, 255, 0.1);
    --gradient-start: #7C4DFF;
    --gradient-end: #651FFF;
    --transition: all 0.3s ease;
    --heading-font: 'Poppins', sans-serif;
    --body-font: 'Inter', sans-serif;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--body-font);
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.6;
    background-image: linear-gradient(135deg, var(--bg-color) 0%, rgba(124, 77, 255, 0.05) 100%);
    font-size: 16px;
    font-weight: 400;
}

/* Header Styles */
.main-header {
    background: linear-gradient(135deg, var(--header-bg), var(--primary-color));
    color: white;
    padding: 0.5rem 0;
    box-shadow: 0 1px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.container {
    width: min(1200px, 90%);
    margin: 0 auto;
    padding: 0 1rem;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
}

.logo-container {
    display: flex;
    flex-direction: column;
}

.logo-container h1 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
}

.logo-container .tagline {
    font-size: 0.9rem;
    margin: 0;
    opacity: 0.9;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: clamp(1rem, 2vw, 2rem);
}

.nav-category {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: var(--transition);
    font-weight: 500;
    position: relative;
    display: inline-block;
}

.nav-category:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.8rem;
    z-index: 1001;
    position: relative;
    width: 45px;
    height: 45px;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.menu-toggle .bar {
    display: block;
    width: 25px;
    height: 3px;
    background-color: white;
    margin: 5px auto;
    transition: transform 0.3s ease-in-out, opacity 0.3s ease-in-out;
    border-radius: 3px;
    pointer-events: none;
}

.menu-toggle.active {
    position: fixed;
    right: 1rem;
    top: 1rem;
}

.menu-toggle.active .bar:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.menu-toggle.active .bar:nth-child(2) {
    opacity: 0;
    transform: translateX(-100%);
}

.menu-toggle.active .bar:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Category Links Styles */
.category-links {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    padding: 1.5rem 0;
}

.category-links a {
    color: var(--text-color);
    text-decoration: none;
    padding: 1.25rem;
    border-radius: 15px;
    background: var(--card-bg);
    box-shadow: 0 4px 6px var(--shadow-color);
    transition: var(--transition);
    display: flex;
    align-items: center;
    position: relative;
    width: 100%;
}

.category-links a:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 12px var(--shadow-color);
}

/* Mobile Styles */
@media screen and (max-width: 768px) {
    .main-header {
        padding: 0.3rem 0;
    }

    .header-content {
        padding: 0.3rem 0;
    }

    .logo-container h1 {
        font-size: 1.2rem;
    }

    .logo-container .tagline {
        font-size: 0.8rem;
    }

    .nav-links {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: linear-gradient(135deg, var(--header-bg), var(--primary-color));
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 1.5rem;
        padding: 4rem 2rem;
        z-index: 1000;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.3s ease, visibility 0.3s ease;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .nav-links.active {
        display: flex;
        opacity: 1;
        visibility: visible;
    }

    .nav-links a {
        color: white;
        font-size: 1.2rem;
        padding: 1rem 2rem;
        width: 100%;
        text-align: center;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        transition: background-color 0.3s ease;
    }

    .nav-links a:hover {
        background-color: rgba(255, 255, 255, 0.1);
    }

    .nav-links a:active {
        background-color: rgba(255, 255, 255, 0.2);
    }

    .nav-links a:last-child {
        border-bottom: none;
    }

    .menu-toggle {
        display: block;
    }
}

/* Small Mobile Styles */
@media screen and (max-width: 480px) {
    .category-links {
        display: flex;
        flex-direction: column;
        gap: 1rem;
        padding: 1rem 0;
        grid-template-columns: 1fr !important;
    }

    .category-links a {
        width: 100%;
        margin: 0;
        padding: 1rem;
        font-size: 0.95rem;
        display: block;
    }
}

.search-container {
    width: min(95%, 800px);
    margin: 2.5rem auto;
    padding: 0 2rem;
}

.search-box {
    position: relative;
}

.search-box input {
    width: 100%;
    padding: 1.25rem 1.25rem 1.25rem 3.5rem;
    border: 2px solid var(--border-color);
    border-radius: 50px;
    font-size: 1.1rem;
    background: var(--card-bg);
    transition: var(--transition);
    box-shadow: var(--shadow-color);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.search-box .search-icon {
    position: absolute;
    left: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--primary-color);
    font-size: 1.4rem;
}

.main-content {
    flex: 1;
    width: min(95%, 1200px);
    margin: 0 auto 3rem;
    padding: 0 2rem;
}

.calculator-container {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: var(--shadow-color);
    border: 1px solid var(--border-color);
}

.calculator-container h2 {
    margin-bottom: 2rem;
    font-family: 'Poppins', sans-serif;
    color: var(--primary-color);
    text-align: center;
    font-size: 2rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
}

/* Footer Styles */
.main-footer {
    background: linear-gradient(135deg, var(--footer-bg), var(--primary-color));
    color: white;
    padding: 3rem 0 1rem;
    margin-top: 3rem;
}

.footer-content {
    width: min(95%, 1200px);
    margin: 0 auto;
    padding: 0 1rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    font-family: var(--heading-font);
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: white;
}

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

.footer-section li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: white;
    text-decoration: underline;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.6;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1rem;
    margin-top: 2rem;
    text-align: center;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.version {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .calculator-grid {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .about-grid {
        grid-template-columns: 1fr;
    }

    .category-grid {
        grid-template-columns: 1fr 1fr;
    }

    .search-container {
        margin: 1rem auto;
        max-width: 100%;
        padding: 0 1rem;
    }

    .search-box {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .category-grid {
        grid-template-columns: 1fr;
    }

    .search-container {
        padding: 0 0.5rem;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* Print Styles */
@media print {
    .main-header {
        position: static;
        box-shadow: none;
        background: none;
        color: black;
    }

    .calculator-card {
        break-inside: avoid;
        box-shadow: none;
    }

    .primary-button {
        border: 1px solid var(--primary-color);
        background: none;
        color: var(--primary-color);
    }

    .footer-content {
        display: none;
    }
}

@media (max-width: 767px) {
    .calculator-container {
        display: block !important;
        visibility: visible !important;
        height: auto !important;
        opacity: 1 !important;
        margin-bottom: 1.5rem !important;
        padding: 1.5rem !important;
    }

    .calculator-container.hidden {
        display: none !important;
        height: 0 !important;
        margin: 0 !important;
        padding: 0 !important;
        opacity: 0 !important;
    }
}

@media (min-width: 1441px) {
    .main-content {
        grid-template-columns: repeat(3, 1fr);
        max-width: 1600px;
    }
    
    .search-box {
        max-width: 1000px;
    }
}

@media (min-width: 1024px) and (max-width: 1440px) {
    .main-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .calculator-container {
        padding: 2rem;
    }
    
    .calculator-container h2 {
        font-size: 1.5rem;
        margin-bottom: 1.5rem;
    }
  
}