/* Reset */
* { box-sizing: border-box; margin: 0; padding: 0; font-family: sans-serif; }

/* Global Body Styling */
body {
    padding: 20px;
    background-color: #eef3fb;
    font-family: Arial, sans-serif;
    margin: 0;
}

/* Header Banner */
.header {
    background-color: #2b5090;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    padding: 40px 20px 30px 20px !important; /* Dynamically balanced padding */
    text-align: center;
    border-radius: 0 0 24px 24px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.header h1 {
    color: white !important;
    font-size: clamp(28px, 6vw, 56px) !important; /* Slightly reduced & dynamic title scaling */
    font-weight: 800;
    margin-bottom: 20px !important; /* Balanced space below title */
    letter-spacing: 2px;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.search-bar {
    width: 90% !important;
    max-width: 600px !important;
    padding: 14px 20px !important;
    border-radius: 35px !important;
    border: none !important;
    outline: none !important;
    font-size: 16px !important;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.search-bar:focus {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

/* Tool Container & Responsive Grid */
.container { 
    padding: 20px 10px; 
    width: 95%;
    max-width: 1000px; /* Expands to fit PC screens comfortably */
    margin: auto; 
}

.tool-grid { 
    display: grid; 
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); /* Fluid grid layout for Mobile & PC */
    gap: 15px; 
    margin-top: 20px; 
}

.tool-card { 
    background: white; 
    padding: 20px 15px; 
    font-size: 16px !important;
    text-align: center; 
    border-radius: 12px; 
    text-decoration: none; 
    color: #3b5998; 
    font-weight: bold; 
    border: 1px solid #ddd;
    transition: 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.tool-card:hover { background: #f0f2f5; }

/* Footer */
.footer { 
    text-align: center; 
    padding: 30px; 
    color: #777; 
    font-size: 14px; 
    margin-top: 40px; 
}

/* --- UNIVERSAL TOOL PAGE STYLING --- */
h1 {
    text-align: center;
    color: #3b5998;
    font-weight: bold;
    margin-bottom: 20px;
}

/* Rounded, blue-border container for tool logic */
.calculator-container {
    background: white;
    padding: 25px;
    border-radius: 15px;
    border: 2px solid #3b5998;
    width: 95%;
    max-width: 650px; /* Fluid container for PC/Mobile */
    margin: 0 auto;
}

/* Buttons and Inputs */
input, select, button {
    width: 100%;
    padding: 12px;
    margin: 10px 0;
    border-radius: 8px;
    border: 1px solid #ddd;
    box-sizing: border-box;
}

button {
    background-color: #3b5998;
    color: white;
    font-size: 16px !important;
    font-weight: bold;
    cursor: pointer;
}

.back-link {
    display: block;
    text-align: center;
    margin-top: 20px;
    color: #3b5998;
    font-weight: bold;
    text-decoration: none;
}

/* ==========================================
   AD INTERSTITIAL MODAL STYLES
   ========================================== */

/* Fixed Full-Screen Centered Overlay */
.ad-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.7); /* Dark dimmed background */
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 99999; /* Ensures overlay stays on top */
}

/* Centered Floating Card */
.ad-modal-card {
    background: #ffffff;
    border-radius: 16px;
    padding: 24px 20px;
    width: 90%;
    max-width: 420px; /* Fits comfortably on PC while remaining responsive */
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    margin: auto;
}

.ad-modal-card h3 {
    margin: 0 0 8px 0;
    color: #1a1a1a;
    font-size: 18px;
}

/* 2-Line Skip Instruction Box */
.skip-instructions {
    background-color: #eef3fb;
    border-left: 3px solid #3b5998;
    color: #333333;
    font-size: 13px;
    padding: 10px 12px;
    border-radius: 6px;
    margin: 12px 0;
    text-align: left;
    line-height: 1.4;
}

/* Responsive Banner Container */
.ad-box-banner {
    width: 100%;
    max-width: 320px;
    min-height: 50px;
    margin: 14px auto;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    background-color: #f4f4f4;
    border-radius: 4px;
}

/* Modal Action Button */
.ad-btn {
    width: 100%;
    padding: 14px;
    background-color: #3b5998;
    color: #ffffff;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    margin-top: 10px;
    transition: background-color 0.2s ease;
}

/* Disabled State during Timer */
.ad-btn:disabled {
    background-color: #a0a0a0;
    cursor: not-allowed;
    }