/* Reset Basic */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    color: #333;
    line-height: 1.6;
}

.container {
    width: 85%;
    margin: auto;
    max-width: 1200px;
}

.text-center { text-align: center; }
.bg-light { background-color: #f9f9f9; }
.bg-dark { background-color: #1a252f; }
.text-white { color: #fff; }
.section-padding { padding: 60px 0; }

/* Header & Nav */
header {
    background: #ffffff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo { font-weight: 700; color: #16a085; }
.logo span { color: #2c3e50; }

nav ul { display: flex; list-style: none; align-items: center;}
nav ul li { margin-left: 20px; }
nav ul li a { text-decoration: none; color: #555; font-weight: 500; }
nav ul li a:hover { color: #16a085; }

/* Buttons */
.btn-main {
    display: inline-block;
    background: #16a085;
    color: #fff;
    padding: 10px 25px;
    border: none;
    border-radius: 5px;
    text-decoration: none;
    cursor: pointer;
    font-weight: 600;
    margin-top: 15px;
}
.btn-main:hover { background: #117a65; }

.btn-secondary {
    background: #e67e22;
    color: white;
    padding: 8px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.btn-affiliate {
    display: block;
    text-align: center;
    background: #ff5722;
    color: white;
    text-decoration: none;
    padding: 8px;
    border-radius: 4px;
    margin-top: 10px;
    font-size: 14px;
}

/* Hero */
.hero {
    background: linear-gradient(135deg, #16a085 0%, #2c3e50 100%);
    color: white;
    padding: 100px 0;
}
.hero h2 { font-size: 36px; margin-bottom: 15px; }

/* Interactive Tool Box */
.section-title { text-align: center; font-size: 28px; margin-bottom: 5px; }
.section-subtitle { text-align: center; color: #777; margin-bottom: 30px; }

.tool-box {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    max-width: 600px;
    margin: auto;
}

.tool-box select {
    width: 100%;
    padding: 10px;
    margin: 10px 0 200px 0;
    display: block;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.tool-box select { margin-bottom: 15px;}

.result-box { margin-top: 25px; padding-top: 20px; border-top: 1px solid #eee; }
.result-box textarea {
    width: 100%;
    height: 120px;
    padding: 10px;
    margin: 10px 0;
    border-radius: 4px;
    border: 1px solid #ddd;
    resize: none;
}

/* Grid & Cards */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}
.card {
    background: white;
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 3px 10px rgba(0,0,0,0.05);
    border: 1px solid #eee;
}
.card-body { padding: 20px; }
.card-body h4 { margin-bottom: 10px; color: #2c3e50;}
.read-more { display:inline-block; margin-top:15px; text-decoration:none; color:#16a085; font-weight:600;}

/* Footer */
footer { text-align: center; padding: 20px; background: #222; color: #777; font-size: 14px; margin-top: 40px;}