/* =========================================================
   APLEXCUB v1.0 - CORE CSS (PRD COMPLIANT)
   ========================================================= */
:root {
    --primary: #2563EB;
    --secondary: #3B82F6;
    --accent: #06B6D4;
    --background: #FFFFFF;
    --surface: #F8FAFC;
    --text: #111827;
    --border: #E2E8F0;
    --radius-card: 20px; /* PRD Strict Rule */
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html, body {
    font-family: 'Inter', sans-serif;
    background-color: var(--background);
    color: var(--text);
    width: 100%; max-width: 100vw;
    overflow-x: hidden !important; 
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { font-family: 'Poppins', sans-serif; color: var(--text); line-height: 1.2; }
a { text-decoration: none; color: inherit; transition: var(--transition); }
ul { list-style: none; }

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ================== BUTTONS ================== */
.btn {
    display: inline-flex; justify-content: center; align-items: center;
    padding: 14px 28px; border-radius: 12px; font-weight: 600; font-size: 16px;
    cursor: pointer; border: none; transition: var(--transition);
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--secondary); transform: translateY(-2px); }
.btn-secondary { background: var(--surface); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }

/* ================== HERO & SEARCH UI ================== */
.hero-section { padding: 100px 0 80px; text-align: center; background: var(--surface); }
.hero-text h1 { font-size: 48px; font-weight: 700; margin-bottom: 24px; }
.hero-text p { font-size: 18px; color: #4B5563; max-width: 650px; margin: 0 auto 40px; line-height: 1.6; }

.search-wrapper {
    max-width: 600px; margin: 0 auto 40px; position: relative;
    display: flex; align-items: center;
}
.search-wrapper input {
    width: 100%; padding: 18px 24px 18px 50px; border-radius: var(--radius-card);
    border: 1px solid var(--border); font-size: 16px; font-family: 'Inter', sans-serif;
    outline: none; box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05); transition: var(--transition);
}
.search-wrapper input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1); }
.search-icon { position: absolute; left: 20px; color: #9CA3AF; }
.search-btn {
    position: absolute; right: 8px; background: var(--primary); color: white;
    border: none; padding: 10px 24px; border-radius: 16px; font-weight: 600; cursor: pointer; transition: var(--transition);
}
.search-btn:hover { background: var(--secondary); }
.hero-buttons { display: flex; justify-content: center; gap: 16px; }

/* ================== CATEGORIES ================== */
.categories-section { padding: 40px 0; border-bottom: 1px solid var(--border); }
.category-wrapper { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.category-badge {
    padding: 10px 24px; background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius-card); font-weight: 500; color: var(--text); font-size: 14px;
    cursor: pointer; transition: var(--transition);
}
.category-badge:hover { border-color: var(--primary); color: var(--primary); background: #EFF6FF; }

/* ================== TOOL CARDS ================== */
.tools-section { padding: 80px 0; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 { font-size: 32px; font-weight: 700; margin-bottom: 8px; }
.section-header p { color: #4B5563; }

.tools-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.tool-card {
    background: #FFFFFF; padding: 32px; border-radius: var(--radius-card);
    border: 1px solid var(--border); transition: var(--transition);
    position: relative; overflow: hidden; display: flex; flex-direction: column;
}
.tool-card:hover { transform: translateY(-5px); box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05); border-color: var(--primary); }
.tool-icon {
    width: 56px; height: 56px; border-radius: 16px; display: flex; align-items: center; justify-content: center; margin-bottom: 24px; transition: var(--transition);
}
.tool-info h3 { font-size: 20px; margin-bottom: 8px; font-weight: 600; }
.tool-info p { color: #4B5563; font-size: 14px; line-height: 1.6; }