/* --- THEME VARIABLES --- */
:root {
    --primary: #3b82f6; 
    --accent-green: #10b981;
    --accent-purple: #8b5cf6;
    --dark-text: #0f172a;
    --light-text: #64748b;
    --blue-grad: linear-gradient(135deg, #60a5fa, #2563eb);
    --green-grad: linear-gradient(135deg, #34d399, #059669);
    --purple-grad: linear-gradient(135deg, #a78bfa, #7c3aed);
    /* New Orange Gradient for Solar */
    --orange-grad: linear-gradient(135deg, #f59e0b, #d97706);
    --glass-bg: rgba(255, 255, 255, 0.9); 
    --glass-border: 1px solid rgba(255, 255, 255, 0.8);
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --error-red: #ef4444;
    
    /* Light Mode Default */
    --bg-color: #f0f4f8;
    --card-bg: white;
    --input-bg: #fff;
    --input-border: #e2e8f0;
    --nav-bg: rgba(255,255,255,0.9);
}

/* DARK MODE VARIABLES */
[data-theme="dark"] {
    --bg-color: #0f172a;
    --dark-text: #f1f5f9;
    --light-text: #94a3b8;
    --card-bg: #1e293b;
    --glass-bg: rgba(30, 41, 59, 0.95);
    --glass-border: 1px solid rgba(255, 255, 255, 0.1);
    --input-bg: #334155;
    --input-border: #475569;
    --nav-bg: rgba(30, 41, 59, 0.9);
    --card-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Inter', sans-serif; }

body { 
    background-color: var(--bg-color);
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(59, 130, 246, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(16, 185, 129, 0.15) 0%, transparent 40%);
    background-attachment: fixed;
    color: var(--dark-text); 
    min-height: 100vh;
    display: flex; flex-direction: column;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* --- NAVBAR UPDATED --- */
nav {
    background: var(--nav-bg); backdrop-filter: blur(15px);
    padding: 15px 5%; 
    display: flex; justify-content: space-between; align-items: center;
    position: sticky; top: 0; z-index: 1000; border-bottom: 1px solid var(--glass-border);
    transition: background 0.3s ease;
}

.logo {
    font-size: 24px; font-weight: 800; letter-spacing: -0.5px;
    background: linear-gradient(90deg, var(--primary), var(--accent-green));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    display: flex; align-items: center; gap: 10px; cursor: pointer;
    text-decoration: none;
}

/* NEW: Center Menu Styling (Buttons) */
.nav-center-menu {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-pill {
    display: flex; align-items: center; gap: 8px;
    text-decoration: none; color: var(--dark-text);
    font-size: 14px; font-weight: 600;
    padding: 8px 18px; border-radius: 50px;
    background-color: rgba(0, 0, 0, 0.03);
    transition: all 0.3s ease; border: 1px solid transparent;
}

/* Dark mode adjustment for pills */
[data-theme="dark"] .nav-pill { background-color: rgba(255, 255, 255, 0.05); color: var(--dark-text); }

.nav-pill:hover {
    background-color: var(--primary); color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.nav-actions { display: flex; align-items: center; gap: 15px; }

.theme-toggle {
    background: var(--input-bg); border: 1px solid var(--input-border);
    width: 40px; height: 40px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; color: var(--dark-text); transition: 0.3s;
}
.theme-toggle:hover { transform: scale(1.1); }

.lang-box {
    display: flex; align-items: center; gap: 8px;
    background: var(--input-bg); border: 1px solid var(--input-border); padding: 6px 12px;
    border-radius: 20px; box-shadow: 0 2px 5px rgba(0,0,0,0.05); transition: 0.3s;
}
.lang-box:hover { transform: translateY(-2px); box-shadow: 0 5px 10px rgba(0,0,0,0.1); }
.lang-select { border: none; outline: none; background: transparent; font-weight: 600; color: var(--dark-text); cursor: pointer; }
.lang-select option { background: var(--card-bg); color: var(--dark-text); }

/* --- HERO SECTION --- */
.hero { text-align: center; padding: 70px 20px 50px; }
.hero h1 { font-size: 46px; font-weight: 800; margin-bottom: 15px; color: var(--dark-text); letter-spacing: -1px; }
.hero p { color: var(--light-text); font-size: 18px; margin-bottom: 60px; max-width: 600px; margin-left: auto; margin-right: auto; }

.cards-wrapper { display: flex; justify-content: center; gap: 30px; flex-wrap: wrap; max-width: 1200px; margin: 0 auto; }

/* --- SIMPLE CARDS CSS --- */
.feature-card {
    background: var(--card-bg); 
    border: 1px solid var(--glass-border);
    padding: 40px 30px; border-radius: 24px; width: 280px;
    text-align: center;
    box-shadow: var(--card-shadow); 
    position: relative; overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    border-color: var(--primary);
}

.icon-box { 
    width: 70px; height: 70px; border-radius: 22px; margin: 0 auto 25px; 
    display: flex; align-items: center; justify-content: center; font-size: 28px; color: white;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}
.c-blue .icon-box { background: var(--blue-grad); } 
.c-green .icon-box { background: var(--green-grad); } 
.c-purple .icon-box { background: var(--purple-grad); }
.c-orange .icon-box { background: var(--orange-grad); }

.feature-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; color: var(--dark-text); }
.feature-card p { font-size: 15px; color: var(--light-text); margin-bottom: 30px; line-height: 1.6; }

.btn-sm {
    padding: 12px 28px; border-radius: 14px; font-size: 14px; font-weight: 600; border: none; cursor: pointer; color: white;
    transition: 0.3s; width: fit-content; margin: 0 auto;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}
.c-blue .btn-sm { background: var(--blue-grad); }
.c-green .btn-sm { background: var(--green-grad); }
.c-purple .btn-sm { background: var(--purple-grad); }
.c-orange .btn-sm { background: var(--orange-grad); }
.btn-sm:hover { opacity: 0.9; transform: scale(1.02); }

/* --- CALCULATOR AREA --- */
#calc-area {
    max-width: 800px; margin: 100px auto; background: var(--card-bg);
    border-radius: 32px; border: 1px solid var(--glass-border);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1); overflow: hidden;
    transition: background 0.3s ease;
}

.tabs-container { padding: 25px 25px 0; background: var(--bg-color); border-bottom: 1px solid var(--glass-border); transition: background 0.3s; }
.tabs { display: flex; background: var(--input-border); padding: 6px; border-radius: 18px; gap: 8px; flex-wrap: wrap;}
.tab {
    flex: 1; text-align: center; padding: 14px; cursor: pointer; border-radius: 14px;
    font-size: 14px; font-weight: 600; color: var(--light-text); transition: all 0.3s ease;
    display: flex; align-items: center; justify-content: center; gap: 8px;
    min-width: 100px;
}
.tab.active { background: var(--card-bg); color: var(--primary); box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1); }

.calc-body { padding: 40px; }
.form-section { display: none; animation: slideUp 0.4s ease-out; }
.form-section.active { display: block; }
@keyframes slideUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.input-group { margin-bottom: 25px; }
.input-group label { display: block; font-size: 13px; font-weight: 700; color: var(--light-text); margin-bottom: 12px; text-transform: uppercase; letter-spacing: 0.5px; }
.input-group input, .input-group select {
    width: 100%; padding: 18px; border: 2px solid var(--input-border); border-radius: 18px; font-size: 16px; background: var(--input-bg);
    transition: 0.3s; color: var(--dark-text);
}
.input-group input:focus, .input-group select:focus { 
    border-color: var(--primary); outline: none; box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1); 
}

.btn-main {
    width: 100%; padding: 20px; border: none; border-radius: 18px; font-size: 17px; font-weight: 700; color: white; cursor: pointer;
    background: var(--blue-grad); box-shadow: 0 10px 15px -3px rgba(37, 99, 235, 0.3); transition: all 0.3s;
}
.btn-main:hover { transform: translateY(-2px); box-shadow: 0 15px 20px -3px rgba(37, 99, 235, 0.4); }

/* NEW PREDICTION STYLES */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 20px; }
.radio-group { margin-bottom: 25px; }
.radio-options { display: flex; flex-direction: column; gap: 10px; }
.radio-label {
    display: flex; align-items: center; padding: 10px 15px;
    border-radius: 10px; border: 1px solid var(--input-border);
    cursor: pointer; transition: 0.2s; color: var(--dark-text);
}
.radio-label:hover { background-color: var(--bg-color); }
.radio-label input { margin-right: 12px; width: 18px; height: 18px; accent-color: var(--primary); }

.toggle-group {
    display: flex; justify-content: space-between; align-items: center;
    margin-top: 20px; padding-top: 20px; border-top: 1px dashed var(--input-border);
}
.toggle-text h4 { margin: 0; font-size: 14px; color: var(--accent-purple); font-weight: 700; }
.toggle-text p { margin: 4px 0 0; font-size: 12px; color: var(--light-text); }

/* Modern Switch */
.switch { position: relative; display: inline-block; width: 50px; height: 28px; flex-shrink: 0; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: #cbd5e1; transition: .4s; border-radius: 34px; }
.slider:before { position: absolute; content: ""; height: 20px; width: 20px; left: 4px; bottom: 4px; background-color: white; transition: .4s; border-radius: 50%; box-shadow: 0 2px 4px rgba(0,0,0,0.1); }
input:checked + .slider { background: var(--blue-grad); }
input:checked + .slider:before { transform: translateX(22px); }

#tod-inputs { display: none; background: var(--bg-color); padding: 15px; border-radius: 12px; margin-top: 15px; border: 1px solid var(--input-border); }

.breakdown-table { width: 100%; border-collapse: collapse; margin-top: 10px; font-size: 14px; }
.breakdown-table td { padding: 8px 0; color: var(--dark-text); border-bottom: 1px solid var(--input-border); }
.breakdown-table tr.total-row td { padding-top: 15px; font-weight: 800; font-size: 20px; color: var(--primary); border-bottom: none; }

/* Error Message */
.error-msg {
    color: var(--error-red); font-size: 14px; font-weight: 600; margin-top: 10px; display: none; text-align: center;
}

/* Result Panel */
.result-panel { margin-top: 40px; background: #f0fdf4; border-radius: 24px; padding: 30px; display: none; border: 2px solid #bbf7d0; }
.res-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 25px; }
.res-item { background: white; padding: 15px; border-radius: 16px; border: 1px solid #dcfce7; text-align: center; }
.res-label { font-size: 13px; color: #166534; font-weight: 600; margin-bottom: 5px; }
.res-value { font-size: 20px; font-weight: 800; color: #14532d; }
.total-pay-box { background: var(--green-grad); padding: 25px; border-radius: 20px; text-align: center; color: white; box-shadow: 0 10px 20px rgba(16, 185, 129, 0.2); }
.total-amount { font-size: 42px; font-weight: 800; margin-top: 5px; text-shadow: 0 2px 4px rgba(0,0,0,0.1); }

/* Solar Details Box */
.solar-details { background: #fff7ed; border: 1px solid #fed7aa; border-radius: 16px; padding: 20px; margin-top: 25px; display: none; }
.solar-row { display: flex; justify-content: space-between; margin-bottom: 10px; font-size: 14px; color: #9a3412; font-weight: 600; }
.solar-val { color: #ea580c; font-weight: 800; }

/* Appliances Grid */
.app-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 20px; }
.app-item { background: var(--bg-color); padding: 20px; border-radius: 20px; text-align: center; border: 2px solid var(--input-border); transition: 0.3s; cursor: pointer; color: var(--dark-text); }
.app-item:hover { border-color: var(--primary); background: var(--card-bg); transform: translateY(-5px); }
.app-item input { width: 100%; padding: 8px; text-align: center; margin-top: 10px; border-radius: 8px; border: 1px solid #ccc; font-weight: bold; background: var(--input-bg); color: var(--dark-text); }

/* --- FOOTER --- */
footer { 
    text-align: center; padding: 60px 20px; color: var(--light-text); font-size: 14px; font-weight: 500;
    background: var(--nav-bg); border-top: 1px solid var(--glass-border); margin-top: auto;
}
.footer-links { display: flex; justify-content: center; gap: 25px; margin-bottom: 25px; flex-wrap: wrap; }
.footer-links a { color: var(--light-text); text-decoration: none; font-weight: 600; transition: 0.3s; cursor: pointer; }
.footer-links a:hover { color: var(--primary); }

/* --- PAGE CONTENT --- */
.page-container {
    max-width: 800px; margin: 40px auto; padding: 40px;
    background: var(--card-bg); border-radius: 24px; border: 1px solid var(--glass-border);
    box-shadow: 0 4px 20px rgba(0,0,0,0.05); display: none; animation: fadeIn 0.4s ease;
}
@keyframes fadeIn { from{opacity:0; transform:translateY(20px);} to{opacity:1; transform:translateY(0);} }

.page-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 30px; border-bottom: 2px solid var(--input-border); padding-bottom: 20px; }
.page-title { font-size: 28px; font-weight: 800; color: var(--dark-text); }
.back-btn { 
    background: var(--bg-color); border: none; padding: 10px 20px; border-radius: 12px; 
    font-weight: 600; color: var(--light-text); cursor: pointer; transition: 0.2s; display: flex; align-items: center; gap: 8px;
}
.back-btn:hover { background: var(--input-border); color: var(--dark-text); }

.page-body { font-size: 15px; line-height: 1.8; color: var(--light-text); }
.page-body h4 { font-size: 18px; margin-top: 30px; margin-bottom: 12px; color: var(--dark-text); font-weight: 700; }
.page-body p { margin-bottom: 15px; }
.page-body ul { padding-left: 20px; margin-bottom: 20px; }

.tariff-table { width: 100%; border-collapse: collapse; margin-top: 20px; font-size: 15px; }
.tariff-table th, .tariff-table td { border: 1px solid var(--input-border); padding: 12px; text-align: left; }
.tariff-table th { background: var(--bg-color); font-weight: 700; color: var(--dark-text); }

.gov-disclaimer {
    margin-top: 40px; padding: 15px; background: #fff1f2; 
    border-left: 4px solid #f43f5e; color: #881337; font-size: 14px;
    border-radius: 8px; font-weight: 500;
}

@media (max-width: 768px) { 
    .hero h1 { font-size: 34px; } 
    .res-grid { grid-template-columns: 1fr; } 
    .cards-wrapper { flex-direction: column; align-items: center; } 
    .form-grid { grid-template-columns: 1fr; } 
    
    /* NEW: Mobile Nav Adjustments */
    .nav-pill span { display: none; } /* Hide text */
    .nav-pill { padding: 10px; border-radius: 50%; width: 40px; height: 40px; justify-content: center; }
    nav { padding: 10px 15px; }
    .nav-center-menu { gap: 8px; }
}
<style>
    /* --- DROPDOWN CSS (Yahi par laga di taaki turant kaam kare) --- */
    .nav-center-menu {
        display: flex;
        align-items: center;
        gap: 10px;
    }
    .nav-dropdown {
        position: relative;
        display: inline-block;
    }
    .dropbtn {
        border: none;
        cursor: pointer;
        font-family: 'Inter', sans-serif;
        display: flex;
        align-items: center;
        gap: 8px;
    }
    .dropdown-content {
        display: none; /* By default chhupa rahega */
        position: absolute;
        top: 100%; 
        left: 50%;
        transform: translateX(-50%); 
        background-color: white; /* Background White */
        min-width: 220px;
        box-shadow: 0 10px 25px rgba(0,0,0,0.15);
        border-radius: 12px;
        border: 1px solid #e2e8f0;
        z-index: 9999;
        padding: 8px;
        margin-top: 10px;
    }
    /* Links Style */
    .dropdown-content a {
        color: #333;
        padding: 12px 15px;
        text-decoration: none;
        display: flex;
        align-items: center;
        gap: 10px;
        font-size: 14px;
        font-weight: 500;
        border-radius: 8px;
        transition: 0.2s;
        white-space: nowrap;
    }
    /* Icons Color */
    .dropdown-content a i {
        width: 20px;
        text-align: center;
        color: #3b82f6;
    }
    /* Hover Effect */
    .dropdown-content a:hover {
        background-color: #f1f5f9;
        color: #2563eb;
    }
    /* Show on Hover */
    .nav-dropdown:hover .dropdown-content {
        display: block;
    }
    /* Mobile Responsive Fix */
    @media (max-width: 768px) {
        .dropdown-content {
            left: -50px; /* Mobile par thoda adjust */
            transform: none;
        }
    }
</style>

<nav>
    <a href="./" class="logo">
        <i class="fas fa-bolt-lightning" style="font-size: 26px;"></i> 
        <span class="logo-text">KSEB Bill Calculator</span>
    </a>

    <div class="nav-center-menu">
        <a href="./" class="nav-pill">
            <i class="fas fa-home"></i> 
            <span>Home</span>
        </a>

        <a href="contact" class="nav-pill">
            <i class="fas fa-envelope"></i> 
            <span>Contact Us</span>
        </a>
        
        <div class="nav-dropdown">
            <button class="nav-pill dropbtn">
                <i class="fas fa-book"></i> 
                <span>Legal</span>
                <i class="fas fa-caret-down" style="font-size: 12px; margin-left: 5px;"></i>
            </button>
            
            <div class="dropdown-content">
                <a href="privacy-policy">
                    <i class="fas fa-shield-alt"></i> Privacy Policy
                </a>
                <a href="terms-and-conditions">
                    <i class="fas fa-file-contract"></i> Terms & Conditions
                </a>
                <a href="about-us">
                    <i class="fas fa-info-circle"></i> About Us
                </a>
            </div>
        </div>
    </div>

    <div class="nav-actions">
        <button class="theme-toggle" onclick="toggleDarkMode()">
            <i class="fas fa-moon"></i>
        </button>
        <div class="lang-box">
            <i class="fas fa-language" style="color:var(--primary); font-size: 18px;"></i>
            <select class="lang-select" id="langToggle" onchange="changeLanguage()">
                <option value="en">English</option>
                <option value="ml">മലയാളം</option>
            </select>
        </div>
    </div>
</nav>