:root { --bg-color: #1a1a2e; --panel-bg: #0d111c; --text-color: #ffffff; --gold: #c09f6b; --gold-hover: #d4af37; --danger: #ef4444; --success: #22c55e; }
body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background-color: var(--bg-color); color: var(--text-color); margin: 0; padding: 0; }
header { display: flex; justify-content: space-between; align-items: center; padding: 20px 40px; background: var(--panel-bg); border-bottom: 2px solid var(--gold); }
.logo { font-size: 1.5em; font-weight: bold; color: var(--gold); text-decoration: none; }
.btn-home { background: transparent; border: 1px solid var(--gold); color: var(--gold); padding: 8px 15px; border-radius: 20px; cursor: pointer; text-decoration: none; transition: 0.3s; }
.btn-home:hover { background: var(--gold); color: #fff; }
.logo-text { color: #fff; }
.container { max-width: 600px; margin: 40px auto; padding: 0 20px; }
h1 { color: var(--gold); text-align: center; font-size: 2.5em; margin-bottom: 10px; }
.section-desc { text-align: center; color: #aaa; margin-bottom: 40px; line-height: 1.6;}
.tool-card { background: var(--panel-bg); border: 1px solid rgba(192, 159, 107, 0.3); border-radius: 15px; padding: 30px; }
.calc-group { margin-bottom: 15px; }
.calc-group label { display: block; font-size: 0.95em; color: #ccc; margin-bottom: 8px; }
.calc-group input { width: 100%; padding: 12px; background: rgba(255,255,255,0.05); border: 1px solid #333; border-radius: 8px; color: #fff; box-sizing: border-box; outline: none; font-size: 1.1em; }
.calc-group input:focus { border-color: var(--gold); }
.calc-btn { width: 100%; padding: 12px; background: var(--gold); color: #fff; border: none; border-radius: 8px; font-weight: bold; cursor: pointer; transition: 0.3s; margin-top: 15px; font-size: 1.1em; }
.calc-btn:hover { background: var(--gold-hover); }
.calc-result { margin-top: 20px; padding: 15px; background: rgba(192, 159, 107, 0.1); border-radius: 8px; border: 1px solid rgba(192, 159, 107, 0.3); display: none; text-align: center; }
.calc-result span { display: block; font-size: 1.8em; font-weight: bold; color: var(--danger); margin-top: 5px; }