:root {
    --primary: #10b981; /* Emerald */
    --primary-hover: #059669;
    --accent: #34d399; 
    
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --input-bg: rgba(15, 23, 42, 0.6);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: rgba(255, 255, 255, 0.1);
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Cairo', sans-serif; }

body {
    background-color: var(--bg-color);
    background-image: radial-gradient(at 0% 0%, rgba(16, 185, 129, 0.15) 0px, transparent 50%),
                      radial-gradient(at 100% 100%, rgba(59, 130, 246, 0.15) 0px, transparent 50%);
    background-attachment: fixed;
    color: var(--text-main);
    min-height: 100vh;
    padding: 40px 20px;
    display: flex; justify-content: center; align-items: center;
}

.app-container { width: 100%; max-width: 800px; display: flex; flex-direction: column; gap: 25px; }

.tool-card {
    background: var(--card-bg); backdrop-filter: blur(16px);
    border: 1px solid var(--border-color); border-radius: 24px; padding: 35px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.tool-header { text-align: center; margin-bottom: 30px; }
.icon-wrapper {
    display: inline-flex; justify-content: center; align-items: center;
    width: 70px; height: 70px; background: linear-gradient(135deg, var(--primary), #3b82f6);
    border-radius: 20px; margin-bottom: 16px; box-shadow: 0 10px 25px -5px rgba(16, 185, 129, 0.5);
}
.icon-wrapper ion-icon { font-size: 36px; color: white; }
.tool-header h1 { font-size: 2rem; font-weight: 800; margin-bottom: 8px; }
.tool-header p { color: var(--text-muted); font-size: 1rem; }

.calculator-body {
    display: grid; grid-template-columns: 1fr 1fr; gap: 30px;
    background: var(--input-bg); border-radius: 20px; padding: 25px;
    border: 1px solid var(--border-color);
}

/* Inputs */
.inputs-section { display: flex; flex-direction: column; gap: 20px; }
.input-group { display: flex; flex-direction: column; gap: 10px; }
label { font-size: 0.95rem; font-weight: 600; color: var(--text-muted); }

.input-wrapper { position: relative; display: flex; align-items: center; }
.input-wrapper ion-icon { position: absolute; right: 15px; font-size: 20px; color: var(--text-muted); z-index: 2;}

input[type="number"] {
    width: 100%; background: var(--bg-color); border: 1px solid var(--border-color);
    color: var(--text-main); font-size: 1.1rem; font-weight: 700;
    padding: 14px 15px 14px 15px; border-radius: 12px; outline: none; transition: all 0.3s ease; text-align: left;
}
input[type="number"]:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2); }

.input-wrapper input { padding-right: 45px; }

/* Tip Buttons */
.tip-options { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.tip-btn {
    background: var(--bg-color); border: 1px solid var(--border-color); color: #fff;
    padding: 12px; border-radius: 12px; font-size: 1.1rem; font-weight: 700;
    cursor: pointer; transition: all 0.3s;
}
.tip-btn:hover { border-color: var(--primary); }
.tip-btn.active { background: var(--primary); border-color: var(--primary); color: #000; box-shadow: 0 5px 15px rgba(16, 185, 129, 0.4); }

/* Qty Control */
.qty-control { display: flex; align-items: center; gap: 10px; }
.qty-control button {
    width: 45px; height: 45px; min-width: 45px; background: var(--bg-color);
    border: 1px solid var(--border-color); color: var(--primary); border-radius: 12px;
    font-size: 20px; display: flex; justify-content: center; align-items: center;
    cursor: pointer; transition: all 0.2s;
}
.qty-control button:hover { background: rgba(255,255,255,0.05); }
.qty-control input { text-align: center; }

/* Results */
.results-section {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.15), rgba(59, 130, 246, 0.1));
    border-radius: 20px; padding: 25px; display: flex; flex-direction: column; justify-content: space-between;
}
.result-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 25px; }
.result-label h4 { font-size: 1.1rem; font-weight: 700; color: #fff; margin-bottom: 3px; }
.result-label span { font-size: 0.85rem; color: var(--text-muted); }

.result-value { font-size: 2rem; font-weight: 800; display: flex; align-items: baseline; gap: 5px; }
.result-value::before { content: '$'; font-size: 1.2rem; }
.total-row { border-top: 1px dashed rgba(255,255,255,0.2); padding-top: 25px; }
.total-row .result-value { font-size: 2.8rem; }

.text-accent { color: var(--accent); }
.text-primary { color: var(--primary); }

.btn-reset {
    width: 100%; background: transparent; border: 1px solid var(--primary); color: var(--primary);
    padding: 12px; border-radius: 12px; font-size: 1rem; font-weight: 700;
    cursor: pointer; transition: all 0.3s; margin-top: auto;
}
.btn-reset:hover { background: var(--primary); color: #000; }

/* SEO */
.seo-content { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 20px; padding: 25px; }
.seo-content h2 { font-size: 1.3rem; color: #fff; margin-bottom: 12px; }
.seo-content p { color: var(--text-muted); font-size: 0.95rem; line-height: 1.8; margin-bottom: 10px; }
.seo-content strong { color: var(--primary); }

.ads-container { width: 100%; display: flex; justify-content: center; }
.ads-placeholder { width: 100%; max-width: 728px; height: 90px; background: rgba(15, 23, 42, 0.5); border: 1px dashed rgba(255, 255, 255, 0.2); border-radius: 12px; display: flex; justify-content: center; align-items: center; color: var(--text-muted); }

@media (max-width: 768px) {
    .calculator-body { grid-template-columns: 1fr; }
    .results-section { margin-top: 10px; }
}


/* Light Mode Theme Auto-injected */
body.light-mode {
    --bg-color: #f1f5f9;
    --card-bg: rgba(255, 255, 255, 0.85);
    --input-bg: rgba(255, 255, 255, 0.95);
    --text-main: #0f172a;
    --text-muted: #475569;
    --border-color: rgba(0, 0, 0, 0.1);
}

body.light-mode .tool-card, 
body.light-mode .article-container,
body.light-mode .seo-content {
    background: rgba(255, 255, 255, 0.9) !important;
    color: #0f172a !important;
}

body.light-mode select, 
body.light-mode input, 
body.light-mode textarea {
    background: #fff;
    color: #0f172a;
    border-color: rgba(0,0,0,0.2);
}

body.light-mode .logo { color: #0f172a !important; text-shadow: none !important; }



/* Layout Fixes for Header & Footer */
body {
    display: block !important;
}
.app-container, .article-container {
    margin-left: auto !important;
    margin-right: auto !important;
}