/* 
   Indian Font Converter - Main Stylesheet
   Modern, Responsive Design
   Author: Development Team
   Version: 1.0.0
*/

/* ============================================
   CSS VARIABLES & ROOT STYLES
   ============================================ */
:root {
    /* Primary Colors */
    --primary-color: #6366F1;
    --primary-dark: #4F46E5;
    --primary-light: #818CF8;
    
    /* Secondary Colors */
    --secondary-color: #EC4899;
    --secondary-dark: #DB2777;
    
    /* Accent Colors */
    --accent-orange: #F97316;
    --accent-purple: #A855F7;
    --accent-cyan: #06B6D4;
    
    /* Neutral Colors */
    --white: #FFFFFF;
    --bg-light: #F8FAFC;
    --bg-lighter: #F1F5F9;
    --text-dark: #1E293B;
    --text-gray: #64748B;
    --text-light: #94A3B8;
    --border-color: #E2E8F0;
    --border-dark: #CBD5E1;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

/* ============================================
   GLOBAL STYLES
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-light);
    overflow-x: hidden;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 3rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2.25rem;
}

h3 {
    font-size: 1.875rem;
}

h4 {
    font-size: 1.5rem;
}

h5 {
    font-size: 1.25rem;
}

h6 {
    font-size: 1rem;
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-gray);
}

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

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

/* ============================================
   HEADER & NAVIGATION
   ============================================ */
header {
    background: var(--white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-xl);
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo img {
    height: 40px;
    width: auto;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
    align-items: center;
}

.nav-item {
    position: relative;
}

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

.nav-link:hover {
    color: var(--primary-color);
}

.nav-link.active {
    color: var(--primary-color);
}

/* Level 1 Submenu (Dropdown) */
.submenu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--white);
    list-style: none;
    min-width: 220px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-normal);
    margin-top: var(--spacing-sm);
    border-top: 3px solid var(--primary-color);
    padding: var(--spacing-sm) 0;
    z-index: 100;
}

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

.submenu li {
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.submenu li:last-child {
    border-bottom: none;
}

.submenu a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-dark);
    transition: all var(--transition-fast);
    font-weight: 500;
}

.submenu a:hover {
    background-color: var(--bg-lighter);
    color: var(--primary-color);
    padding-left: calc(var(--spacing-lg) + var(--spacing-md));
}

/* Level 2 Submenu (Nested) */
.submenu .submenu {
    position: absolute;
    top: 0;
    left: 100%;
    margin-top: 0;
    margin-left: var(--spacing-sm);
    border-top: none;
    border-left: 3px solid var(--primary-color);
    opacity: 0;
    visibility: hidden;
    transform: translateX(-10px);
    transition: all var(--transition-normal);
    min-width: 220px;
}

.submenu li:hover > .submenu {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

.submenu .submenu a {
    padding: var(--spacing-md) var(--spacing-lg);
    font-weight: 400;
    font-size: 0.95rem;
}

.submenu .submenu a:hover {
    padding-left: calc(var(--spacing-lg) + var(--spacing-md));
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: var(--spacing-xs);
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-dark);
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(10px, 10px);
}

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

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ============================================
   MAIN CONTENT CONTAINER
   ============================================ */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    width: 100%;
}

.container-sm {
    max-width: 900px;
}

.container-lg {
    max-width: 1600px;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: var(--spacing-3xl) var(--spacing-xl);
    text-align: center;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-content {
    max-width: 800px;
    animation: fadeInUp 0.8s ease-out;
}

.hero h1 {
    color: var(--white);
    margin-bottom: var(--spacing-lg);
    font-size: 3.5rem;
}

.hero p {
    color: rgba(255, 255, 255, 0.95);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
}

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

/* ============================================
   BUTTONS & CTAs
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    text-decoration: none;
    white-space: nowrap;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: var(--white);
}

.btn-secondary:hover {
    background-color: var(--secondary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: var(--white);
}

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

.btn-white:hover {
    background-color: var(--bg-lighter);
}

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.875rem;
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: 1.125rem;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ============================================
   FEATURE CARDS
   ============================================ */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-2xl);
    margin: var(--spacing-3xl) 0;
}

.feature-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    text-align: center;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--accent-purple) 100%);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 2rem;
}

.feature-card h3 {
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
}

.feature-card p {
    color: var(--text-gray);
    margin: 0;
}

/* ============================================
   SECTIONS
   ============================================ */
section {
    padding: var(--spacing-3xl) var(--spacing-xl);
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title h2 {
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
}

.section-title p {
    font-size: 1.125rem;
    color: var(--text-gray);
    margin: 0;
}

/* ============================================
   FOOTER
   ============================================ */
footer {
    background-color: var(--text-dark);
    color: var(--white);
    padding: var(--spacing-3xl) var(--spacing-xl);
    margin-top: var(--spacing-3xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h4 {
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

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

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

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

.footer-section a:hover {
    color: var(--white);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-xl);
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

/* Tablet */
@media (max-width: 768px) {
    h1 {
        font-size: 2.25rem;
    }
    
    h2 {
        font-size: 1.875rem;
    }
    
    h3 {
        font-size: 1.5rem;
    }
    
    .navbar {
        padding: var(--spacing-md);
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--white);
        gap: 0;
        box-shadow: var(--shadow-lg);
        border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-item {
        width: 100%;
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-link {
        padding: var(--spacing-lg);
        width: 100%;
    }
    
    .submenu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        background: var(--bg-lighter);
        display: none;
        margin-top: 0;
    }
    
    .submenu.active {
        display: flex;
        flex-direction: column;
    }
    
    .submenu a {
        padding: var(--spacing-md) var(--spacing-lg) var(--spacing-md) var(--spacing-2xl);
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero {
        min-height: 400px;
        padding: var(--spacing-2xl) var(--spacing-lg);
    }
    
    .hero h1 {
        font-size: 2.25rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    section {
        padding: var(--spacing-2xl) var(--spacing-lg);
    }
}

/* Mobile */
@media (max-width: 480px) {
    :root {
        --spacing-xl: 1.25rem;
        --spacing-2xl: 1.5rem;
        --spacing-3xl: 2rem;
    }
    
    h1 {
        font-size: 1.875rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    h3 {
        font-size: 1.25rem;
    }
    
    .navbar {
        padding: var(--spacing-md);
    }
    
    .logo {
        font-size: 1.25rem;
    }
    
    .hero h1 {
        font-size: 1.875rem;
    }
    
    .hero p {
        font-size: 0.95rem;
    }
    
    .btn {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: 0.95rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.mt-sm {
    margin-top: var(--spacing-sm);
}

.mt-md {
    margin-top: var(--spacing-md);
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mt-xl {
    margin-top: var(--spacing-xl);
}

.mb-sm {
    margin-bottom: var(--spacing-sm);
}

.mb-md {
    margin-bottom: var(--spacing-md);
}

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

.mb-xl {
    margin-bottom: var(--spacing-xl);
}

.py-lg {
    padding-top: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
}

.opacity-75 {
    opacity: 0.75;
}

.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}