/* ============================================
   FULL UPDATED WEBSITE CSS
   PercentageCalculatorTool.com
   MOBILE RESPONSIVE VERSION
============================================ */

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

html{
    scroll-behavior:smooth;
}

body{
    font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
    background:#f1f5f9;
    color:#1e293b;
    line-height:1.6;
    overflow-x:hidden;
}

/* CONTAINER */
.container{
    width:100%;
    max-width:1500px;
    margin:auto;
    padding:0 15px;
}

/* ============================================
   CSS VARIABLES
============================================ */
:root{
    --primary:#667eea;
    --primary-dark:#5a6fd6;
    --secondary:#764ba2;
    --accent:#06b6d4;
    --success:#10b981;
    --success-light:#d1fae5;
    --warning:#f59e0b;
    --danger:#ef4444;
    --dark:#1e293b;
    --gray:#64748b;
    --light:#f8fafc;
    --white:#ffffff;
    --border:#e2e8f0;
    --shadow-sm:0 1px 3px rgba(0,0,0,0.06),0 1px 2px rgba(0,0,0,0.04);
    --shadow:0 4px 6px rgba(0,0,0,0.07),0 2px 4px rgba(0,0,0,0.06);
    --shadow-lg:0 10px 25px rgba(0,0,0,0.1),0 4px 10px rgba(0,0,0,0.08);
    --shadow-xl:0 20px 40px rgba(0,0,0,0.12);
    --radius-sm:14px;
    --radius:20px;
    --radius-lg:24px;
    --radius-xl:28px;
    --transition:0.3s cubic-bezier(0.4,0,0.2,1);
}

/* ============================================
   HEADER
============================================ */
.site-header{
    position:sticky;
    top:0;
    z-index:999;
    background:linear-gradient(135deg,#667eea,#764ba2);
    box-shadow:0 2px 15px rgba(0,0,0,0.12);
}

.header-wrapper{
    min-height:72px;
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:20px;
}

/* LOGO */
.logo-link{
    display:flex;
    align-items:center;
    gap:10px;
    text-decoration:none;
    color:#fff;
}

.logo-icon{
    font-size:28px;
}

.logo-text{
    font-size:20px;
    font-weight:800;
}

/* NAV */
.main-nav{
    display:flex;
}

.nav-list{
    display:flex;
    align-items:center;
    gap:8px;
    list-style:none;
}

.nav-item{
    position:relative;
}

.nav-link{
    text-decoration:none;
    color:#fff;
    padding:12px 16px;
    border-radius:12px;
    font-size:15px;
    font-weight:700;
    transition:0.3s;
    white-space:nowrap;
}

.nav-link:hover,
.nav-link.active{
    background:rgba(255,255,255,0.15);
}

/* DROPDOWN */
.dropdown-menu{
    position:absolute;
    top:100%;
    left:0;
    width:240px;
    background:#fff;
    border-radius:16px;
    padding:10px;
    list-style:none;
    display:none;
    box-shadow:0 10px 30px rgba(0,0,0,0.12);
}

.dropdown:hover .dropdown-menu{
    display:block;
}

.dropdown-menu li a{
    display:block;
    padding:12px 14px;
    border-radius:10px;
    text-decoration:none;
    color:#1e293b;
    font-size:14px;
    transition:0.3s;
}

.dropdown-menu li a:hover{
    background:#eff6ff;
    color:#667eea;
}

/* MOBILE MENU */
.mobile-menu-toggle{
    display:none;
    flex-direction:column;
    gap:5px;
    background:none;
    border:none;
    cursor:pointer;
    z-index:1000;
}

.bar{
    width:26px;
    height:3px;
    background:#fff;
    border-radius:30px;
    transition:0.3s;
}

/* ============================================
   MAIN CONTENT
============================================ */
.main-content{
    padding:25px 0;
}

/* INTRO */
.intro-box{
    background:linear-gradient(135deg,#667eea,#764ba2);
    color:#fff;
    padding:35px;
    border-radius:24px;
    text-align:center;
    margin-bottom:25px;
    box-shadow:0 8px 30px rgba(102,126,234,0.2);
}

.page-title{
    font-size:38px;
    line-height:1.3;
    margin-bottom:15px;
    font-weight:800;
}

.intro-text{
    font-size:17px;
    opacity:0.96;
    max-width:900px;
    margin:auto;
}

/* ============================================
   MAIN LAYOUT - DESKTOP (3 COLUMNS)
============================================ */
.main-layout{
    display:grid;
    grid-template-columns:170px 1fr 170px;
    gap:22px;
    align-items:start;
}

/* ============================================
   AD SPACES
============================================ */

/* ============ DESKTOP ADS ============ */
.desktop-ad-left,
.desktop-ad-right{
    display:block;
    position:sticky;
    top:95px;
}

.desktop-ad-left .vertical-ad,
.desktop-ad-right .vertical-ad{
    background:#fff;
    border-radius:20px;
    padding:12px;
    border:1px solid #e2e8f0;
    box-shadow:0 2px 12px rgba(0,0,0,0.06);
}

.desktop-ad-left .ad-placeholder,
.desktop-ad-right .ad-placeholder{
    width:100%;
    height:600px;
    background:#f8fafc;
    border:2px dashed #cbd5e1;
    border-radius:16px;
    display:flex;
    align-items:center;
    justify-content:center;
    color:#64748b;
    font-size:14px;
    font-weight:600;
}

/* ============ MOBILE ADS - DESKTOP ME HIDDEN ============ */
.mobile-ad-300x250,
.mobile-ad-300x600{
    display:none !important;
}

/* Ad Label */
.ad-label{
    text-align:center;
    font-size:11px;
    color:#94a3b8;
    margin-bottom:8px;
    text-transform:uppercase;
    letter-spacing:0.5px;
}

/* ============================================
   CENTER CONTENT
============================================ */
.center-content{
    width:100%;
    min-width:0;
}

/* ============================================
   CALCULATOR + FORMULA GRID
============================================ */
.calculator-formula-grid{
    display:grid;
    grid-template-columns:1.4fr 0.8fr;
    gap:22px;
    margin-bottom:25px;
}

/* ============================================
   MODERN CALCULATOR STYLES
============================================ */

/* Calculator Container */
.calculator-container{
    background:var(--white);
    border-radius:var(--radius-xl);
    padding:32px 28px;
    border:1px solid var(--border);
    box-shadow:var(--shadow-lg);
    position:relative;
    overflow:hidden;
    transition:var(--transition);
}

.calculator-container::before{
    content:'';
    position:absolute;
    top:-50%;
    right:-50%;
    width:300px;
    height:300px;
    background:radial-gradient(circle,rgba(102,126,234,0.06) 0%,transparent 70%);
    border-radius:50%;
    pointer-events:none;
}

.calculator-container::after{
    content:'';
    position:absolute;
    bottom:-30%;
    left:-30%;
    width:250px;
    height:250px;
    background:radial-gradient(circle,rgba(118,75,162,0.05) 0%,transparent 70%);
    border-radius:50%;
    pointer-events:none;
}

.calculator-container:hover{
    box-shadow:var(--shadow-xl);
    transform:translateY(-2px);
}

/* Calculator Header */
.calculator-header{
    text-align:center;
    margin-bottom:28px;
    position:relative;
    z-index:1;
}

.calculator-icon{
    width:60px;
    height:60px;
    background:linear-gradient(135deg,var(--primary),var(--secondary));
    border-radius:18px;
    display:inline-flex;
    align-items:center;
    justify-content:center;
    font-size:28px;
    color:white;
    margin-bottom:16px;
    box-shadow:0 8px 20px rgba(102,126,234,0.3);
    animation:float 3s ease-in-out infinite;
}

@keyframes float{
    0%,100%{transform:translateY(0px);}
    50%{transform:translateY(-8px);}
}

.calculator-title{
    font-size:32px;
    font-weight:800;
    background:linear-gradient(135deg,var(--primary),var(--secondary));
    -webkit-background-clip:text;
    -webkit-text-fill-color:transparent;
    background-clip:text;
    margin-bottom:8px;
    letter-spacing:-0.5px;
}

.calculator-subtitle{
    color:var(--gray);
    font-size:15px;
    font-weight:500;
}

/* Tab Buttons */
.calc-tabs{
    display:flex;
    gap:10px;
    margin-bottom:28px;
    flex-wrap:wrap;
    position:relative;
    z-index:1;
}

.calc-tab-btn{
    flex:1;
    min-width:140px;
    padding:14px 20px;
    border:2px solid var(--border);
    background:var(--light);
    border-radius:var(--radius);
    cursor:pointer;
    font-size:14px;
    font-weight:700;
    color:var(--dark);
    transition:var(--transition);
    position:relative;
    overflow:hidden;
}

.calc-tab-btn::before{
    content:'';
    position:absolute;
    top:0;
    left:-100%;
    width:100%;
    height:100%;
    background:linear-gradient(135deg,var(--primary),var(--secondary));
    transition:var(--transition);
    z-index:-1;
    border-radius:var(--radius);
}

.calc-tab-btn:hover{
    border-color:var(--primary);
    color:var(--primary);
    transform:translateY(-2px);
    box-shadow:var(--shadow);
}

.calc-tab-btn.active{
    background:linear-gradient(135deg,var(--primary),var(--secondary));
    color:var(--white);
    border-color:transparent;
    box-shadow:0 8px 20px rgba(102,126,234,0.3);
}

.calc-tab-btn .tab-icon{
    margin-right:6px;
}

/* Input Section */
.calc-input-group{
    margin-bottom:16px;
    position:relative;
    z-index:1;
}

.calc-input-group label{
    display:block;
    margin-bottom:8px;
    font-size:13px;
    font-weight:700;
    color:var(--dark);
    text-transform:uppercase;
    letter-spacing:0.5px;
}

.input-icon-wrapper{
    position:relative;
}

.input-icon-wrapper .input-icon{
    position:absolute;
    left:16px;
    top:50%;
    transform:translateY(-50%);
    color:var(--gray);
    font-size:16px;
    transition:var(--transition);
    pointer-events:none;
    z-index:2;
}

.input-icon-wrapper input{
    width:100%;
    height:54px;
    border:2px solid var(--border);
    border-radius:var(--radius);
    padding:0 16px 0 44px;
    background:var(--light);
    font-size:16px;
    font-weight:600;
    color:var(--dark);
    transition:var(--transition);
}

.input-icon-wrapper input:focus{
    outline:none;
    border-color:var(--primary);
    background:var(--white);
    box-shadow:0 0 0 4px rgba(102,126,234,0.1);
}

.input-icon-wrapper input:focus ~ .input-icon{
    color:var(--primary);
}

.input-icon-wrapper input::placeholder{
    color:#94a3b8;
    font-weight:400;
}

.input-row{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:16px;
    margin-bottom:8px;
}

/* Error State */
.input-icon-wrapper.error input{
    border-color:var(--danger);
    background:#fef2f2;
}

.error-message{
    color:var(--danger);
    font-size:12px;
    font-weight:600;
    margin-top:4px;
    display:none;
}

.input-icon-wrapper.error .error-message{
    display:block;
}

/* Buttons */
.calc-actions{
    display:flex;
    gap:12px;
    margin-top:24px;
    position:relative;
    z-index:1;
}

.btn-calculate{
    flex:1;
    height:54px;
    border:none;
    border-radius:var(--radius);
    background:linear-gradient(135deg,var(--primary),var(--secondary));
    color:var(--white);
    font-size:16px;
    font-weight:800;
    cursor:pointer;
    transition:var(--transition);
    box-shadow:0 8px 20px rgba(102,126,234,0.3);
    letter-spacing:0.3px;
    position:relative;
    overflow:hidden;
}

.btn-calculate::before{
    content:'';
    position:absolute;
    top:50%;
    left:50%;
    width:0;
    height:0;
    background:rgba(255,255,255,0.2);
    border-radius:50%;
    transform:translate(-50%,-50%);
    transition:width 0.6s,height 0.6s;
}

.btn-calculate:hover{
    transform:translateY(-2px);
    box-shadow:0 12px 28px rgba(102,126,234,0.4);
}

.btn-calculate:active::before{
    width:300px;
    height:300px;
}

.btn-calculate:active{
    transform:translateY(0px);
}

.btn-reset{
    width:54px;
    height:54px;
    border:2px solid var(--border);
    border-radius:var(--radius);
    background:var(--white);
    color:var(--gray);
    font-size:18px;
    cursor:pointer;
    transition:var(--transition);
    display:flex;
    align-items:center;
    justify-content:center;
    flex-shrink:0;
}

.btn-reset:hover{
    border-color:var(--danger);
    color:var(--danger);
    background:#fef2f2;
    box-shadow:var(--shadow);
}

/* Result Card */
.result-card{
    margin-top:24px;
    background:linear-gradient(135deg,#ecfdf5,#d1fae5);
    border:2px solid #6ee7b7;
    border-radius:var(--radius-lg);
    padding:24px;
    display:none;
    animation:slideUp 0.4s ease-out;
    position:relative;
    z-index:1;
}

.result-card.show{
    display:block;
}

@keyframes slideUp{
    from{
        opacity:0;
        transform:translateY(20px);
    }
    to{
        opacity:1;
        transform:translateY(0);
    }
}

.result-card-header{
    display:flex;
    align-items:center;
    justify-content:space-between;
    margin-bottom:16px;
}

.result-label-text{
    font-size:12px;
    font-weight:700;
    text-transform:uppercase;
    color:var(--gray);
    letter-spacing:0.5px;
}

.btn-copy{
    padding:6px 14px;
    border:1px solid var(--border);
    background:var(--white);
    border-radius:20px;
    cursor:pointer;
    font-size:12px;
    font-weight:600;
    color:var(--gray);
    transition:var(--transition);
    display:flex;
    align-items:center;
    gap:4px;
}

.btn-copy:hover{
    border-color:var(--primary);
    color:var(--primary);
}

.btn-copy.copied{
    border-color:var(--success);
    color:var(--success);
    background:var(--success-light);
}

.result-big-number{
    font-size:48px;
    font-weight:900;
    color:var(--success);
    line-height:1;
    margin-bottom:4px;
    font-variant-numeric:tabular-nums;
}

.result-big-number .unit{
    font-size:24px;
    font-weight:700;
    opacity:0.7;
}

.result-steps{
    background:var(--white);
    border-radius:var(--radius-sm);
    padding:16px;
    margin-top:16px;
    border:1px solid var(--border);
}

.result-steps .step-title{
    font-size:12px;
    font-weight:700;
    text-transform:uppercase;
    color:var(--gray);
    margin-bottom:10px;
    letter-spacing:0.5px;
}

.result-steps .step{
    font-size:14px;
    color:var(--dark);
    margin-bottom:6px;
    padding-left:20px;
    position:relative;
    font-weight:500;
}

.result-steps .step::before{
    content:'▸';
    position:absolute;
    left:0;
    color:var(--primary);
}

.result-steps .step:last-child{
    margin-bottom:0;
}

/* ============================================
   HOW IT WORKS BOX
============================================ */
.how-it-works-box{
    background:var(--white);
    border-radius:var(--radius-xl);
    padding:28px;
    border:1px solid var(--border);
    box-shadow:var(--shadow);
    height:100%;
    position:relative;
    overflow:hidden;
}

.how-it-works-box::before{
    content:'';
    position:absolute;
    top:-40%;
    right:-40%;
    width:200px;
    height:200px;
    background:radial-gradient(circle,rgba(102,126,234,0.04) 0%,transparent 70%);
    border-radius:50%;
    pointer-events:none;
}

.how-title{
    font-size:24px;
    font-weight:800;
    margin-bottom:20px;
    position:relative;
    z-index:1;
}

.formula-card{
    margin-bottom:18px;
    padding-bottom:18px;
    border-bottom:1px solid var(--border);
    position:relative;
    z-index:1;
}

.formula-card:last-child{
    margin-bottom:0;
    padding-bottom:0;
    border-bottom:none;
}

.formula-card h3{
    font-size:16px;
    font-weight:700;
    margin-bottom:10px;
    display:flex;
    align-items:center;
    gap:8px;
}

.formula-badge{
    display:inline-block;
    background:linear-gradient(135deg,var(--primary),var(--secondary));
    color:var(--white);
    padding:8px 14px;
    border-radius:10px;
    font-size:13px;
    font-weight:700;
    margin-bottom:8px;
    letter-spacing:0.3px;
}

.formula-card p{
    font-size:13px;
    color:var(--gray);
    margin-top:6px;
}

/* ============================================
   CONTENT BOX
============================================ */
.content-box{
    background:#fff;
    border-radius:24px;
    padding:28px;
    margin-bottom:25px;
    border:1px solid #e2e8f0;
    box-shadow:0 2px 12px rgba(0,0,0,0.06);
}

.content-title{
    font-size:28px;
    margin-bottom:15px;
}

.content-box p{
    margin-bottom:15px;
    color:#475569;
}

/* ============================================
   TOOLS
============================================ */
.more-tools-section,
.faq-section{
    background:#fff;
    border-radius:24px;
    padding:28px;
    margin-bottom:25px;
    border:1px solid #e2e8f0;
    box-shadow:0 2px 12px rgba(0,0,0,0.06);
}

.section-title{
    font-size:30px;
    margin-bottom:10px;
    text-align:center;
}

.section-description{
    text-align:center;
    color:#64748b;
    margin-bottom:25px;
}

/* TOOL GRID */
.tools-grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
    gap:18px;
}

.tool-card{
    background:#f8fafc;
    border:1px solid #e2e8f0;
    border-radius:18px;
    padding:18px;
    display:flex;
    align-items:center;
    gap:14px;
    text-decoration:none;
    transition:0.3s;
}

.tool-card:hover{
    transform:translateY(-3px);
    border-color:#667eea;
}

.tool-icon{
    width:55px;
    height:55px;
    background:#fff;
    border-radius:16px;
    display:flex;
    align-items:center;
    justify-content:center;
    font-size:28px;
    flex-shrink:0;
}

.tool-info{
    flex:1;
}

.tool-name{
    font-size:16px;
    font-weight:700;
    color:#1e293b;
    margin-bottom:5px;
}

.tool-desc{
    color:#64748b;
    font-size:13px;
}

.tool-arrow{
    color:#667eea;
    font-size:20px;
}

/* VIEW ALL */
.view-all-wrapper{
    text-align:center;
    margin-top:25px;
}

.view-all-btn{
    display:inline-flex;
    align-items:center;
    gap:8px;
    background:linear-gradient(135deg,#667eea,#764ba2);
    color:#fff;
    padding:14px 30px;
    border-radius:50px;
    text-decoration:none;
    font-weight:700;
}

/* ============================================
   FAQ
============================================ */
.faq-item{
    border:1px solid #e2e8f0;
    border-radius:18px;
    margin-bottom:14px;
    overflow:hidden;
}

.faq-question{
    padding:18px 35px 18px 20px;
    font-weight:700;
    cursor:pointer;
    position:relative;
    background:#f8fafc;
}

.faq-question::after{
    content:'+';
    position:absolute;
    right:20px;
    font-size:20px;
    top:50%;
    transform:translateY(-50%);
}

.faq-answer{
    display:none;
    padding:20px;
    color:#64748b;
    background:#fff;
}

.faq-item.open .faq-answer{
    display:block;
}

.faq-item.open .faq-question::after{
    content:'−';
}

/* ============================================
   PROFESSIONAL CLEAN FOOTER
============================================ */

.site-footer{
    background:#0b1120;
    margin-top:60px;
    padding:60px 0 25px;
    position:relative;
    overflow:hidden;
}

/* TOP BORDER */
.site-footer::before{
    content:'';
    position:absolute;
    top:0;
    left:0;
    width:100%;
    height:4px;
    background:linear-gradient(
        90deg,
        #667eea,
        #8b5cf6,
        #06b6d4
    );
}

/* FOOTER GRID */
.footer-content{
    display:grid;
    grid-template-columns:2fr 1fr 1fr 1fr;
    gap:40px;
    padding-bottom:40px;
    border-bottom:1px solid rgba(255,255,255,0.08);
}

/* COLUMN */
.footer-col{
    position:relative;
}

/* LOGO TITLE */
.footer-col h4{
    color:#ffffff;
    font-size:18px;
    font-weight:700;
    margin-bottom:20px;
    letter-spacing:0.3px;
}

/* TEXT */
.footer-col p{
    color:#94a3b8;
    font-size:14px;
    line-height:1.9;
    max-width:320px;
}

/* LINKS */
.footer-col ul{
    list-style:none;
}

.footer-col ul li{
    margin-bottom:12px;
}

.footer-col ul li a{
    color:#94a3b8;
    text-decoration:none;
    font-size:14px;
    transition:0.3s ease;
    position:relative;
}

/* HOVER */
.footer-col ul li a:hover{
    color:#ffffff;
    padding-left:6px;
}

/* SMALL LINE */
.footer-col ul li a::before{
    content:'';
    position:absolute;
    left:-10px;
    top:50%;
    transform:translateY(-50%);
    width:0;
    height:2px;
    background:#667eea;
    transition:0.3s;
}

.footer-col ul li a:hover::before{
    width:6px;
}

/* FOOTER BOTTOM */
.footer-bottom{
    padding-top:22px;
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:15px;
    flex-wrap:wrap;
}

/* COPYRIGHT */
.footer-bottom p{
    color:#64748b;
    font-size:13px;
    letter-spacing:0.3px;
}

/* FOOTER SOCIAL */
.footer-social{
    display:flex;
    align-items:center;
    gap:12px;
}

.footer-social a{
    width:38px;
    height:38px;
    border-radius:50%;
    background:rgba(255,255,255,0.05);
    color:#ffffff;
    display:flex;
    align-items:center;
    justify-content:center;
    text-decoration:none;
    font-size:15px;
    transition:0.3s;
}

.footer-social a:hover{
    background:#667eea;
    transform:translateY(-3px);
}

/* ============================================
   TABLET & MOBILE (Max 992px)
============================================ */

@media(max-width:992px){

    /* HIDE DESKTOP SIDE ADS */
    .desktop-ad-left,
    .desktop-ad-right{
        display:none !important;
    }

    /* SHOW MOBILE ADS */
    .mobile-ad-300x250,
    .mobile-ad-300x600{
        display:block !important;
        background:#fff;
        border-radius:20px;
        padding:15px;
        border:1px solid var(--border);
        box-shadow:var(--shadow);
        margin-bottom:20px;
    }

    /* Mobile Ad 300x250 Placeholder */
    .mobile-ad-300x250 .ad-placeholder{
        width:100%;
        max-width:300px;
        height:250px;
        margin:0 auto;
        background:var(--light);
        border:2px dashed #cbd5e1;
        border-radius:16px;
        display:flex;
        align-items:center;
        justify-content:center;
        color:var(--gray);
        font-size:14px;
        font-weight:600;
    }

    /* Mobile Ad 300x600 Placeholder */
    .mobile-ad-300x600 .ad-placeholder{
        width:100%;
        max-width:300px;
        height:600px;
        margin:0 auto;
        background:var(--light);
        border:2px dashed #cbd5e1;
        border-radius:16px;
        display:flex;
        align-items:center;
        justify-content:center;
        color:var(--gray);
        font-size:14px;
        font-weight:600;
    }

    /* Change Layout to Single Column */
    .main-layout{
        grid-template-columns:1fr;
        gap:20px;
    }

    /* Typography */
    .page-title{
        font-size:32px;
    }

    .calculator-title{
        font-size:26px;
    }

    .how-title{
        font-size:22px;
    }

    /* Calculator + Formula */
    .calculator-formula-grid{
        grid-template-columns:1fr;
        gap:20px;
    }

    /* Calculator Container */
    .calculator-container{
        padding:24px 18px;
        border-radius:var(--radius-lg);
    }

    /* Tabs */
    .calc-tabs{
        gap:8px;
    }

    .calc-tab-btn{
        font-size:13px;
        padding:12px 16px;
    }

    /* Input Row */
    .input-row{
        grid-template-columns:1fr;
        gap:12px;
    }

    /* Buttons */
    .btn-calculate{
        font-size:15px;
        height:50px;
    }

    .btn-reset{
        width:50px;
        height:50px;
    }

    /* Result */
    .result-big-number{
        font-size:36px;
    }

    /* How It Works */
    .how-it-works-box{
        padding:22px 18px;
    }

    /* Tools Grid */
    .tools-grid{
        grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
        gap:14px;
    }

    /* Content Box */
    .content-title{
        font-size:24px;
    }

    /* Footer */
    .footer-content{
        grid-template-columns:1fr 1fr;
        gap:35px;
    }

    .header-wrapper{
        flex-wrap:wrap;
    }

}

/* ============================================
   MOBILE (Max 768px)
============================================ */

@media(max-width:768px){

    /* Header */
    .header-wrapper{
        min-height:60px;
    }

    .logo-text{
        font-size:18px;
    }

    .logo-icon{
        font-size:24px;
    }

    /* Mobile Menu */
    .mobile-menu-toggle{
        display:flex;
    }

    .main-nav{
        position:fixed;
        top:0;
        left:-100%;
        width:80%;
        max-width:320px;
        height:100vh;
        background:#fff;
        flex-direction:column;
        padding:80px 20px 30px;
        transition:0.3s ease;
        box-shadow:2px 0 20px rgba(0,0,0,0.15);
        overflow-y:auto;
        z-index:999;
    }

    .main-nav.active{
        left:0;
    }

    .nav-list{
        flex-direction:column;
        align-items:stretch;
        gap:4px;
    }

    .nav-link{
        color:#1e293b;
        padding:14px 16px;
        display:block;
    }

    .nav-link:hover,
    .nav-link.active{
        background:#f1f5f9;
        color:#667eea;
    }

    /* Dropdown on Mobile */
    .dropdown-menu{
        position:static;
        width:100%;
        box-shadow:none;
        background:#f8fafc;
        padding:5px;
    }

    .dropdown:hover .dropdown-menu{
        display:none;
    }

    .dropdown.open .dropdown-menu{
        display:block;
    }

    /* Intro */
    .intro-box{
        padding:25px 20px;
    }

    .page-title{
        font-size:28px;
    }

    .intro-text{
        font-size:15px;
    }

    /* Calculator */
    .calculator-container{
        padding:22px 16px;
        border-radius:var(--radius);
    }

    .calculator-title{
        font-size:22px;
    }

    .calculator-icon{
        width:48px;
        height:48px;
        font-size:22px;
    }

    /* Tabs Full Width */
    .calc-tab-btn{
        min-width:100%;
    }

    /* Buttons Stack */
    .calc-actions{
        flex-direction:column;
    }

    .btn-reset{
        width:100%;
    }

    /* Result */
    .result-card{
        padding:18px 14px;
    }

    .result-big-number{
        font-size:32px;
    }

    /* How It Works */
    .how-it-works-box{
        padding:20px 16px;
    }

    /* Content */
    .content-box,
    .more-tools-section,
    .faq-section{
        padding:22px 18px;
    }

    .content-title{
        font-size:22px;
    }

    .section-title{
        font-size:24px;
    }

    /* Tools Grid */
    .tools-grid{
        grid-template-columns:1fr;
        gap:12px;
    }

    .tool-card{
        padding:15px;
    }

    /* FAQ */
    .faq-question{
        padding:16px 35px 16px 16px;
        font-size:14px;
    }

    /* Footer */
    .site-footer{
        padding:45px 0 20px;
        margin-top:40px;
    }

    .footer-content{
        grid-template-columns:1fr;
        gap:30px;
        padding-bottom:30px;
    }

    .footer-col h4{
        font-size:17px;
        margin-bottom:16px;
    }

    .footer-col p,
    .footer-col ul li a{
        font-size:13px;
    }

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

}

/* ============================================
   SMALL MOBILE (Max 480px)
============================================ */

@media(max-width:480px){

    .container{
        padding:0 12px;
    }

    .intro-box{
        padding:20px 15px;
        border-radius:18px;
    }

    .page-title{
        font-size:24px;
    }

    /* Calculator */
    .calculator-container{
        padding:18px 12px;
        border-radius:var(--radius-sm);
    }

    .calculator-title{
        font-size:20px;
    }

    .calculator-icon{
        width:42px;
        height:42px;
        font-size:20px;
        border-radius:14px;
    }

    /* Result */
    .result-card{
        padding:16px 12px;
        border-radius:var(--radius);
    }

    .result-big-number{
        font-size:28px;
    }

    .result-steps{
        padding:12px;
    }

    .result-steps .step{
        font-size:12px;
    }

    /* Formula Badge */
    .formula-badge{
        font-size:11px;
        padding:6px 10px;
    }

    .formula-card h3{
        font-size:14px;
    }

    /* Content */
    .content-box,
    .more-tools-section,
    .faq-section{
        padding:18px 14px;
        border-radius:20px;
    }

    /* Tools */
    .tool-card{
        flex-direction:column;
        text-align:center;
        gap:10px;
    }

    .tool-icon{
        width:48px;
        height:48px;
        font-size:24px;
    }

    .tool-arrow{
        display:none;
    }

    /* Mobile Ads */
    .mobile-ad-300x600,
    .mobile-ad-300x250{
        padding:10px;
    }

    .mobile-ad-300x600 .ad-placeholder,
    .mobile-ad-300x250 .ad-placeholder{
        max-width:100%;
    }

    /* Footer */
    .footer-social{
        gap:10px;
    }

    .footer-social a{
        width:34px;
        height:34px;
        font-size:14px;
    }

    .footer-bottom p{
        font-size:12px;
    }

}