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

/* Your existing scrollbar, root variables, body styles remain the same */
html::-webkit-scrollbar {
    width: 1rem;
}

html::-webkit-scrollbar-track {
    background: linear-gradient(to bottom right, #F8F9FA, #E1F5C4);
}

html::-webkit-scrollbar-thumb {
    background: #426589;
    border-radius: 10px;
    border: 2px solid transparent;
}

html::-webkit-scrollbar-thumb:hover {
    background: #2e4663;
}

html {
    scroll-behavior: smooth;
}

:root {
    --primary-color: #3a7bd5;
    --secondary-color: #00d2ff;
    --accent-color: #ff6b6b;
    --success-color: #4CAF50;
    --warning-color: #ff9f43;
    --dark-color: #2c3e50;
    --light-color: #f8f9fa;
    --text-color: #2d3436;
    --text-light: #ffffff;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --gradient-primary: linear-gradient(135deg, #4b6d91, #3c5774);
    --gradient-secondary: linear-gradient(135deg, #82bcfa, #426589);
    --glass-bg: rgba(255, 255, 255, 0.518);
    --highlight: #4361ee;
    --highlight-gradient: linear-gradient(135deg, #4361ee, #3a0ca3);
}



body {
    font-family: 'Montserrat';
    background: linear-gradient(to bottom right, #F8F9FA, #E1F5C4);
    min-height: 100vh;
    margin: 0;
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    line-height: 1.6;
    overflow-x: hidden;
}
.container {
    max-width: 900px;
    margin: 50px auto;
    padding: 20px 30px;
    background: #fff;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    border-radius: 8px;
}
h1, h2 {
    color: #222;
}
h1 {
    text-align: center;
    margin-bottom: 20px;
}
ul {
    margin-left: 20px;
}
p {
    margin-bottom: 10px;
}
a {
    color: #007bff;
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}


/* ===== IMPROVED NAVIGATION SYSTEM ===== */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 1.5rem;
    width: 90%;
    height: 9vh;
    max-width: 1100px;
    margin: 0.5rem auto;
    position: sticky;
    top: 10px;
    z-index: 1000;
    background: #7aacde93;
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 1.5rem;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

/* Slight hover lift */
.navbar:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 35px rgba(0, 0, 0, 0.15);
}

.navbar .logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: white;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.hamburger {
    display: flex;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
    z-index: 2100;
    padding: 8px;
    border-radius: 5px;
    transition: background 0.3s;
}

.hamburger:hover {
    background: rgba(255, 255, 255, 0.1);
}

.hamburger span {
    width: 35px;
    height: 3px;
    background: rgb(0, 0, 0);
    border-radius: 2px;
    transition: all 0.3s ease;
}


/* Hamburger animation when active */
.hamburger.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

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

.hamburger.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* Side Menu */
.calculator-nav {
    position: fixed;
    top: 0;
    right: -400px;
    width: 350px;
    height: 100%;
    background: linear-gradient(135deg, #3c4a59, #34495e);
    padding: 80px 20px 20px 20px;
    overflow-y: auto;
    transition: right 0.4s cubic-bezier(0.23, 1, 0.32, 1);
    z-index: 1500;
    box-shadow: -4px 0 25px rgba(0, 0, 0, 0.2);
}

.calculator-nav.active {
    right: 0;
}

/* Close button */
.close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.close-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

/* Category styles */
.nav-category {
    margin-bottom: 10px;
    border-radius: 10px;
    overflow: hidden;
    background: rgba(0, 0, 0, 0.05);
}

.category-btn {
    width: 100%;
    background: none;
    border: none;
    color: white;
    font-size: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.category-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.category-btn i {
    margin-right: 10px;
    width: 20px;
    text-align: center;
}

.category-btn .arrow {
    transition: transform 0.3s ease;
}

.category-btn.active .arrow {
    transform: rotate(180deg);
}

/* Submenu */
.submenu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
    background: rgba(0, 0, 0, 0.2);
}

.submenu.active {
    max-height: 500px;
}

.submenu .nav-btn {
    background: none;
    border: none;
    text-align: left;
    color: #ddd;
    padding: 12px 20px 12px 50px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    width: 100%;
}

.submenu .nav-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    padding-left: 55px;
}

.nav-btn.active {
    color: #60a5fa;
    background: rgba(96, 165, 250, 0.1);
}

.nav-icon {
    margin-right: 12px;
    width: 20px;
    text-align: center;
}

/* Keep "always-open" category expanded */
.nav-category.always-open .submenu {
max-height: none !important;  /* no collapse */
background: rgba(0, 0, 0, 0.2);
}

.nav-category.always-open .category-btn {
cursor: default;
justify-content: flex-start;
}

.nav-category.always-open .arrow {
display: none; /* hide arrow since no toggle */
}


/* Overlay */
.mobile-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1200;
}

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


/* Header Styling */
header {
    text-align: center;
    margin-bottom: 20px;
    padding: 20px 10px;
}

.ppf-title {
    font-size: 2.5rem;
    font-weight: bold;
    color: #0e0e0e;
    margin-bottom: 8px;
}

.header-subtitle {
    font-size: 1.2rem;
    color: #555;
    font-style: italic;
    max-width: 800px;
    margin: 0 auto;
}

/* Make main grow to push footer down */
main {
    flex: 1;
}
        
/* ===== Responsive Design ===== */
@media (max-width: 768px) {
.container {
    padding: 25px 25px;
    margin: 20px;
}

h1 {
    font-size: 1.6rem;
}

h2 {
    font-size: 1.1rem;
}

p, li {
    font-size: 0.95rem;
}
.navbar {
    padding: 1rem;
}

.calculator-nav {
    width: 300px;
    right: -300px;
}


.submenu .nav-btn {
    padding: 10px 15px 10px 45px;
}

.submenu .nav-btn:hover {
    padding-left: 50px;
}

}

@media (max-width: 480px) {
.container {
    padding: 20px 18px;
    margin: 15px;
}

h1 {
    font-size: 1.4rem;
}

h2 {
    font-size: 1rem;
}

p, li {
    font-size: 0.9rem;
    line-height: 1.6;
}
.calculator-nav {
    width: 280px;
    right: -280px;
    padding: 70px 15px 15px 15px;
}
}

/* ===== FOOTER STYLES ===== */
footer {
    background: linear-gradient(135deg, #4b6d91, #3c5774);
    color: #fff;
    text-align: center;
    padding: 40px 20px 20px;
    font-family: Arial, sans-serif;
}

#ppp{
    color: white;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
}

/* Social Icons */
.footer-social {
    margin-bottom: 20px;
}

.footer-social a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 45px;
    text-decoration: none;
    height: 45px;
    margin: 0 8px;
    background: #fff;
    color: #000;
    border-radius: 50%;
    font-size: 20px;
    transition: all 0.3s ease;
}

.footer-social a:hover {
    transform: translateY(-4px);
    background: #7777778f;
    color: #000;
}

/* Footer Links */
.footer-links {
    margin: 20px 0;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-links a {
    color: #fff;
    text-decoration: none;
    font-size: 15px;
    transition: color 0.3s ease;
    position: relative;
}

.footer-links a:hover {
    color: #c4c1c1f0;
}

/* Tooltip from data-desc */
.footer-links a::after {
    content: attr(data-desc);
    position: absolute;
    bottom: -30px;
    left: 50%;
    transform: translateX(-50%) scale(0.9);
    background: rgba(255, 255, 255, 0.9);
    color: #333;
    padding: 5px 10px;
    border-radius: 4px;
    font-size: 12px;
    opacity: 0;
    transition: all 0.3s ease;
    pointer-events: none;
    white-space: nowrap;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.footer-links a:hover::after {
    opacity: 1;
    transform: translateX(-50%) scale(1);
    bottom: -35px;
}

/* Footer Bottom */
.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.4);
    margin-top: 20px;
    padding-top: 15px;
}

.footer-bottom p {
    font-size: 14px;
    opacity: 0.9;
    color: white ;
}

.footer-bottom span {
    font-weight: bold;
}

/* Responsive Design */
@media (max-width: 768px) {
    footer {
        padding: 2rem 1rem;
    }

    .footer-links {
        gap: 15px;
    }

    .footer-links a {
        font-size: 14px;
    }

    .footer-links a::after {
        display: none;
        /* hide tooltips on small screens */
    }

    .footer-social a {
        width: 36px;
        height: 36px;
        font-size: 16px;
    }
}

@media (max-width: 480px) {
.footer-links {
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.footer-bottom p {
    font-size: 12px;
}
.popular-links a {
    color: #fff;
    font-size: 12px;
    text-decoration: none;
    transition: color 0.3s ease;
}
}

/* Popular Links */
.popular-links a {
    color: #fff;
    text-decoration: none;
    transition: color 0.3s ease;
}

.popular-links a:hover {
    color: #c4c1c1f0;
    text-decoration: underline;
}