/*=========================================
  CONVERTHERE GST CALCULATOR
  PART 1 + PART 2
==========================================*/

/* Google Font */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

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

html{
    scroll-behavior:smooth;
}

body{
    font-family:'Inter',sans-serif;
    background:#f4f7fb;
    color:#111827;
    overflow-x:hidden;
    line-height:1.6;
}

/* VARIABLES */

:root{

    --primary:#2563EB;
    --secondary:#22C55E;

    --bg:#F5F7FB;

    --card:#ffffff;

    --border:#E5E7EB;

    --text:#111827;

    --shadow:0 15px 40px rgba(0,0,0,.08);

    --radius:20px;

}

/* CONTAINER */

.container{

    width:100%;
    max-width:1200px;
    margin:auto;
    padding:0 20px;

}

/* LINKS */

a{

    text-decoration:none;
    color:inherit;

}

/*==========================
HEADER
==========================*/

header{

    position:fixed;
    top:0;
    left:0;
    width:100%;
    height:80px;
    background:#fff;
    display:flex;
    align-items:center;
    box-shadow:0 5px 20px rgba(0,0,0,.08);
    z-index:999;

}

.nav{

    display:flex;
    justify-content:space-between;
    align-items:center;

}

.logo{

    font-size:34px;
    font-weight:800;
    color:var(--primary);

}

.logo span{

    color:var(--secondary);

}

nav{

    display:flex;
    gap:35px;

}

nav a{

    font-weight:600;
    transition:.3s;

}

nav a:hover{

    color:var(--primary);

}

.login-btn{

    border:none;
    padding:13px 30px;
    border-radius:50px;
    background:linear-gradient(135deg,#2563EB,#22C55E);
    color:#fff;
    cursor:pointer;
    font-weight:700;
    transition:.3s;

}

.login-btn:hover{

    transform:translateY(-2px);
    box-shadow:0 12px 25px rgba(37,99,235,.25);

}

/*==========================
HERO
==========================*/

.hero{

    margin-top:80px;
    height:300px;
    background:linear-gradient(135deg,#2563EB,#22C55E);
    display:flex;
    justify-content:center;
    align-items:center;
    text-align:center;
    color:#fff;
    position:relative;
    overflow:hidden;

}

.hero::before{

    content:"";
    position:absolute;
    width:500px;
    height:500px;
    border-radius:50%;
    background:rgba(255,255,255,.08);
    left:-150px;
    bottom:-220px;

}

.hero::after{

    content:"";
    position:absolute;
    width:300px;
    height:300px;
    border-radius:50%;
    background:rgba(255,255,255,.05);
    right:-80px;
    top:-120px;

}

.hero h1{

    font-size:55px;
    font-weight:800;
    margin-bottom:15px;

}

.hero p{

    font-size:20px;
    opacity:.95;

}

/*==========================
CALCULATOR
==========================*/

.calculator-section{

    margin-top:-70px;
    margin-bottom:80px;

}

.calculator-card{

    background:#fff;
    border-radius:25px;
    box-shadow:var(--shadow);
    padding:40px;
    position:relative;
    z-index:10;

}

.calculator-card h2{

    text-align:center;
    font-size:34px;
    margin-bottom:35px;

}

/* MODE */

.mode{

    display:flex;
    justify-content:center;
    gap:30px;
    margin-bottom:30px;

}

.mode label{

    font-weight:600;
    cursor:pointer;

}

/* FORM */

.form-group{

    margin-bottom:25px;

}

.form-group label{

    display:block;
    margin-bottom:10px;
    font-weight:600;

}

.form-group input,
.form-group select{

    width:100%;
    height:55px;
    border:1px solid var(--border);
    border-radius:15px;
    padding:0 18px;
    font-size:16px;
    outline:none;
    transition:.3s;

}

.form-group input:focus,
.form-group select:focus{

    border-color:var(--primary);
    box-shadow:0 0 0 4px rgba(37,99,235,.12);

}

/* BUTTONS */

.buttons{

    display:flex;
    gap:15px;
    margin-top:25px;

}

.buttons button{

    flex:1;
    height:55px;
    border:none;
    border-radius:15px;
    cursor:pointer;
    font-size:16px;
    font-weight:700;
    transition:.3s;

}

#calculate{

    background:linear-gradient(135deg,#2563EB,#22C55E);
    color:#fff;

}

#calculate:hover{

    transform:translateY(-3px);
    box-shadow:0 15px 30px rgba(37,99,235,.25);

}

#reset{

    background:#f3f4f6;

}

#reset:hover{

    background:#e5e7eb;

}

/* RESULT */

.result{

    margin-top:40px;
    background:#f8fafc;
    padding:30px;
    border-radius:20px;

}

.result h3{

    text-align:center;
    margin-bottom:25px;
    font-size:28px;

}

.result table{

    width:100%;
    border-collapse:collapse;

}

.result td{

    padding:16px;
    border-bottom:1px solid #e5e7eb;
    font-size:17px;

}

.result td:last-child{

    text-align:right;
    font-weight:700;

}

.total td{

    background:#2563EB;
    color:#fff;
    font-size:20px;
    border:none;

}

.copy-btn{

    width:100%;
    margin-top:25px;
    height:55px;
    border:none;
    border-radius:15px;
    background:#22C55E;
    color:#fff;
    font-size:17px;
    font-weight:700;
    cursor:pointer;
    transition:.3s;

}

.copy-btn:hover{

    background:#16A34A;
}

/* CARD HOVER */

.calculator-card:hover{

    transform:translateY(-5px);
    transition:.3s;

}
/*=========================================
  PART 3 - HOW IT WORKS + FAQ + RELATED
  FOOTER + RESPONSIVE + DARK MODE
==========================================*/

/* HOW IT WORKS */

.info{
    padding:80px 0;
}

.info h2{
    text-align:center;
    font-size:40px;
    margin-bottom:50px;
    font-weight:800;
}

.steps{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:30px;
}

.steps div{
    background:#fff;
    border-radius:20px;
    padding:35px;
    text-align:center;
    box-shadow:0 10px 30px rgba(0,0,0,.08);
    transition:.35s;
}

.steps div:hover{
    transform:translateY(-10px);
}

.steps h3{
    width:70px;
    height:70px;
    margin:auto;
    border-radius:50%;
    background:linear-gradient(135deg,#2563EB,#22C55E);
    color:#fff;
    display:flex;
    justify-content:center;
    align-items:center;
    font-size:30px;
    margin-bottom:20px;
}

.steps p{
    font-size:17px;
    color:#555;
}

/* FAQ */

.faq{
    padding:80px 0;
}

.faq h2{
    text-align:center;
    font-size:40px;
    margin-bottom:50px;
}

.faq-item{
    background:#fff;
    border-radius:18px;
    padding:25px;
    margin-bottom:20px;
    box-shadow:0 8px 25px rgba(0,0,0,.06);
    transition:.3s;
}

.faq-item:hover{
    transform:translateY(-5px);
}

.faq-item h4{
    font-size:22px;
    margin-bottom:12px;
    color:#2563EB;
}

.faq-item p{
    color:#555;
    line-height:1.8;
}

/* RELATED TOOLS */

.related{
    padding:80px 0;
}

.related h2{
    text-align:center;
    font-size:40px;
    margin-bottom:50px;
}

.cards{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
    gap:25px;
}

.card{
    background:#fff;
    padding:35px;
    border-radius:20px;
    text-align:center;
    font-weight:700;
    font-size:20px;
    cursor:pointer;
    box-shadow:0 10px 30px rgba(0,0,0,.08);
    transition:.35s;
}

.card:hover{
    background:linear-gradient(135deg,#2563EB,#22C55E);
    color:#fff;
    transform:translateY(-10px);
}

/* FOOTER */

footer{
    background:#111827;
    color:#fff;
    padding:60px 20px;
    text-align:center;
    margin-top:80px;
}

footer p{
    opacity:.85;
    line-height:1.8;
}

/* SCROLLBAR */

::-webkit-scrollbar{
    width:10px;
}

::-webkit-scrollbar-thumb{
    background:#2563EB;
    border-radius:20px;
}

::-webkit-scrollbar-track{
    background:#E5E7EB;
}

/* ANIMATIONS */

@keyframes fadeUp{

    from{
        opacity:0;
        transform:translateY(40px);
    }

    to{
        opacity:1;
        transform:translateY(0);
    }

}

.hero,
.calculator-card,
.steps div,
.card,
.faq-item{
    animation:fadeUp .8s ease;
}

/* DARK MODE */

body.dark{
    background:#0F172A;
    color:#fff;
}

body.dark header{
    background:#111827;
}

body.dark nav a{
    color:#fff;
}

body.dark .calculator-card,
body.dark .steps div,
body.dark .card,
body.dark .faq-item,
body.dark .result{
    background:#1E293B;
    color:#fff;
}

body.dark input,
body.dark select{
    background:#0F172A;
    color:#fff;
    border:1px solid #334155;
}

body.dark footer{
    background:#020617;
}

/* RESPONSIVE */

@media(max-width:991px){

.hero h1{
    font-size:42px;
}

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

.buttons{
    flex-direction:column;
}

nav{
    display:none;
}

}

@media(max-width:768px){

.hero{
    height:240px;
}

.hero h1{
    font-size:34px;
}

.hero p{
    font-size:16px;
}

.calculator-card{
    padding:25px;
}

.result td{
    font-size:15px;
}

.logo{
    font-size:28px;
}

.login-btn{
    padding:10px 22px;
}

}

@media(max-width:480px){

.container{
    padding:0 15px;
}

.hero h1{
    font-size:28px;
}

.info h2,
.related h2,
.faq h2{
    font-size:30px;
}

.card{
    padding:25px;
    font-size:18px;
}

}