/* ===== GLOBAL BODY ===== */
body {
    font-family: 'Montserrat';
background: linear-gradient(to bottom right, #F8F9FA, #E1F5C4);
min-height: 100vh;
margin: 0;
color: #4A4A4A;
display: flex;
flex-direction: column;
}
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
/* ------------------------------ */
/* MODERN SCROLLBAR STYLES */
/* ------------------------------ */
html::-webkit-scrollbar {
width: 1rem;
}

html::-webkit-scrollbar-track {
background: linear-gradient(to bottom right, #f9faf8, #E1F5C4);
border-radius: 10px;
}

html::-webkit-scrollbar-thumb {
background: #426589;
border-radius: 10px;
border: 2px solid transparent;
background-clip: content-box;
box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
transition: background 0.3s ease, box-shadow 0.3s ease;
}

html::-webkit-scrollbar-thumb:hover {
background: #2e4663;
box-shadow: 0 4px 8px rgba(0, 0, 0, 0.35);
}

html::-webkit-scrollbar-corner {
background: transparent;
}

/* ===== 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;
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;
}

/* 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;
}

.gratuity-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;
margin-bottom: 6rem;
}

/* ===== CALCULATOR CONTAINER ===== */
.container {
max-width: 800px;
margin: 30px auto;
background: #fff;
border-radius: 12px;
box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
padding: 32px;
transition: all 0.3s ease;
}

/* Form Styling */
.form-group {
margin-bottom: 24px;
position: relative;
}

.form-group label {
display: block;
margin-bottom: 8px;
font-weight: 600;
color: #333;
font-size: 1rem;
}

.form-control {
width: 100%;
padding: 12px 16px;
border: 2px solid #e2e8f0;
border-radius: 8px;
font-size: 1rem;
transition: all 0.3s ease;
box-sizing: border-box;
}

.form-control:focus {
outline: none;
border-color: #0366d6;
box-shadow: 0 0 0 3px rgba(3, 102, 214, 0.1);
}

.form-control:hover {
border-color: #cbd5e0;
}

/* Result Styling */
#result {
margin-top: 24px;
padding: 20px;
background: linear-gradient(135deg, #f0f9ff, #e0f2fe);
border-radius: 8px;
border-left: 4px solid #0366d6;
font-size: 1.25rem;
font-weight: 600;
color: #0366d6;
text-align: center;
min-height: 60px;
display: flex;
align-items: center;
justify-content: center;
transition: all 0.3s ease;
}

#result.error {
background: linear-gradient(135deg, #fef2f2, #fee2e2);
border-left-color: #dc2626;
color: #dc2626;
}

/* Details Section */
.details {
background-color: #f9fbff;
border: 1px solid #d0d7e6;
border-radius: 8px;
padding: 20px 25px;
margin-top: 28px;
font-size: 1rem;
color: #333;
line-height: 1.6;
box-shadow: 0 2px 8px rgba(3, 102, 214, 0.1);
}

.details h2 {
color: #000000;
margin-bottom: 12px;
font-weight: 600;
font-size: 1.3rem;
border-bottom: 2px solid #222324;
padding-bottom: 4px;
}

.details p {
margin-bottom: 12px;
}

.details .formula {
background-color: #e8f0fe;
border-left: 5px solid #0366d6;
padding: 12px 16px;
font-weight: 400;
font-size: 1.1rem;
color: #2b3038;
margin: 16px 0;
border-radius: 4px;
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.details ul {
padding-left: 20px;
margin-bottom: 16px;
}

.details li {
margin-bottom: 8px;
}

/* Main Title */
h1 {
font-size: 2.2rem !important;
font-weight: 700 !important;
color: #000000;
margin-bottom: 16px;
text-align: center;
border-bottom: 3px solid #000000b7;
padding-bottom: 8px;
}


.summary {
font-size: 1.05rem;
color: #444;
line-height: 1.6;
margin: 16px 0;
max-width: 1200px;
margin-left: auto;
margin-right: auto;
}

.summary-list {
max-width: 580px;
margin: 0 auto 24px auto;
padding-left: 20px;
color: #333;
font-size: 1rem;
line-height: 1.5;
list-style-type: disc;
}

.summary-list li {
margin-bottom: 8px;
}

/* ===== RESPONSIVE MEDIA QUERIES ===== */
@media (max-width: 768px) {
.navbar {
    padding: 1rem;
}

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

.gratuity-title {
    font-size: 1.8rem;
}

.header-subtitle {
    font-size: 1rem;
    padding: 0 15px;
}

.container {
    padding: 1.5rem;
    margin: 20px 15px;
}

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

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

h1 {
    font-size: 1.8rem !important;
}
details h2 {
color: #024ea2;
margin-bottom: 12px;
font-weight: 600;
font-size: 1rem;
border-bottom: 2px solid #0366d6;
padding-bottom: 4px;
}
}

@media (max-width: 480px) {
.calculator-nav {
    width: 280px;
    right: -280px;
    padding: 70px 15px 15px 15px;
}

.container {
    padding: 1rem;
    margin: 15px 10px;
}

#result {
    font-size: 1.1rem;
    padding: 15px;
}

.category-btn {
    padding: 12px;
}

.gratuity-title {
    font-size: 1.5rem;
}

h1 {
    font-size: 1.5rem !important;
}

.summary {
    font-size: 0.95rem;
}

.details .formula {
    background-color: #e8f0fe;
    border-left: 5px solid #0366d6;
    padding: 12px 16px;
    font-weight: 400;
    font-size: 1rem;
    color: #033e8c;
    margin: 16px 0;
    border-radius: 4px;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
}

details h2 {
color: #024ea2;
margin-bottom: 12px;
font-weight: 600;
font-size: 1rem;
border-bottom: 2px solid #0366d6;
padding-bottom: 4px;
}

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

.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;
}

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

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

.footer-links {
    gap: 15px;
}

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

.footer-links a::after {
    display: none;
}

.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;
}
}