:root {
    --bg-color: #0D1117;
    --accent-color: #00C896;
    --text-color: #F0F4F8;
    --glass-bg: rgba(255, 255, 255, 0.05);
}

* { box-sizing: border-box; }

body {
    background: radial-gradient(circle at center, #1a202c 0%, var(--bg-color) 100%);
    color: var(--text-color);
    font-family: 'Segoe UI', sans-serif;
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
}

.container { max-width: 850px; width: 100%; }

header { text-align: center; margin-bottom: 30px; }
h1 { color: var(--accent-color); margin-bottom: 5px; }

.number-pad {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    margin: 20px 0;
}

.number-pad button {
    width: 42px;
    height: 42px;
    background: var(--glass-bg);
    border: 1px solid rgba(255,255,255,0.1);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    transition: 0.2s;
}

.number-pad button:hover { background: var(--accent-color); color: var(--bg-color); }
.clear-btn { background: #ff4d4d !important; border: none !important; }

.tool-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 20px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

/* FIX: Input Alignment */
.input-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 20px;
    width: 100%;
}

input {
    background: rgba(0,0,0,0.3);
    border: 2px solid #30363d;
    border-radius: 12px;
    padding: 15px 5px;
    color: var(--accent-color);
    font-size: 1.4rem;
    font-weight: bold;
    text-align: center;
    width: 100%;
    min-width: 0; /* Prevents overflow */
}

#solveBtn {
    width: 100%;
    padding: 15px;
    background: var(--accent-color);
    border: none;
    border-radius: 12px;
    color: var(--bg-color);
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s transform;
}

#solveBtn:hover { transform: translateY(-2px); }

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 10px;
    margin-top: 20px;
}

.res-item {
    background: rgba(255,255,255,0.08);
    padding: 10px;
    border-radius: 8px;
    font-size: 0.8rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.copy-btn {
    background: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    padding: 3px 6px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.65rem;
}

.more-tools { margin: 40px 0; padding: 20px; background: rgba(0,200,150,0.05); border-radius: 15px; }
.links-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 10px; }
.links-grid a { color: #8b949e; text-decoration: none; font-size: 0.8rem; }
.links-grid a:hover { color: var(--accent-color); }

.faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; font-size: 0.85rem; }
.divider { border: 0; border-top: 1px solid rgba(255,255,255,0.1); margin: 30px 0; }

@media (max-width: 500px) {
    .faq-grid { grid-template-columns: 1fr; }
    .input-grid { gap: 8px; }
    input { font-size: 1.1rem; padding: 12px 2px; }
    .number-pad button { width: 36px; height: 36px; font-size: 0.9rem; }
}