:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --bg-light: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --input-bg: #f8fafc;
    --success: #10b981;
}

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

body {
    background-color: var(--bg-light);
    color: var(--text-main);
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

.calculator-card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

.header-section {
    text-align: center;
    margin-bottom: 2rem;
}

.header-section h1 {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

.header-section p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Form Styling */
.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.input-with-icon {
    position: relative;
}

.input-with-icon i {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.input-field {
    width: 100%;
    padding: 0.8rem 1rem 0.8rem 2.5rem;
    border: 1.5px solid var(--border-color);
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 500;
    background: var(--input-bg);
    transition: all 0.2s;
}

.input-field:focus {
    outline: none;
    border-color: var(--primary);
    background: #fff;
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

/* Tip Buttons Grid */
.tip-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 1rem;
}

.tip-btn {
    background: #f1f5f9;
    border: 1.5px solid var(--border-color);
    padding: 0.75rem;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-muted);
}

.tip-btn:hover {
    background: #e2e8f0;
}

.tip-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.custom-tip-container {
    margin-top: 10px;
}

/* Calculate Button */
.calc-btn {
    width: 100%;
    background: var(--primary);
    color: white;
    border: none;
    padding: 1.1rem;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: 1rem;
}

.calc-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.calc-btn:active {
    transform: translateY(0);
}

/* Results Styling (Refined Breakdown) */
.results-section {
    display: none;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 2px dashed #e2e8f0;
    animation: slideUp 0.4s ease-out;
}

.result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: #f8fafc;
    border-radius: 12px;
    margin-bottom: 0.75rem;
    border: 1px solid #e2e8f0;
}

.result-label {
    font-weight: 500;
    color: #64748b;
}

.result-value {
    font-weight: 700;
    font-size: 1.1rem;
    color: #0f172a;
}

.result-row.tip-row .result-value {
    color: #10b981;
}

.total-row {
    background: #fffafa;
    border: 1px solid #fee2e2;
    margin-bottom: 1.5rem;
}

.total-row .result-label {
    color: #ef4444;
    font-weight: 700;
    font-size: 1rem;
}

.total-row .result-value {
    color: #ef4444;
    font-size: 1.8rem;
    font-weight: 800;
}

.split-header {
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #64748b;
    margin: 1.5rem 0 0.75rem;
    display: block;
}

.per-person-row {
    background: #eff6ff;
    border: 1px solid #dbeafe;
}

.per-person-row .result-label {
    color: #2563eb;
    font-weight: 700;
}

.per-person-row .result-value {
    color: #2563eb;
}

/* SEO Content */
.content-section {
    margin-top: 3rem;
    color: var(--text-main);
}

.content-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.content-section h3 {
    font-size: 1.2rem;
    margin: 1.5rem 0 0.75rem;
    font-weight: 600;
}

.content-section p {
    margin-bottom: 1rem;
    color: #475569;
}

/* FAQ Section */
.faq-section {
    margin-top: 3rem;
}

.faq-item {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    margin-bottom: 1rem;
}

.faq-question {
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.faq-answer {
    color: #475569;
    font-size: 0.95rem;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 480px) {
    .tip-grid {
        grid-template-columns: 1fr 1fr;
    }

    .calculator-card {
        padding: 1.5rem;
    }

    .header-section h1 {
        font-size: 1.5rem;
    }
}

/* Tables */
.tip-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.tip-table th {
    background: var(--bg-light);
    text-align: left;
    padding: 12px 15px;
    font-weight: 700;
    color: var(--text-main);
    border-bottom: 2px solid var(--border-color);
}

.tip-table td {
    padding: 12px 15px;
    border-bottom: 1px solid var(--border-color);
    color: #475569;
}

.tip-table tr:hover {
    background: #f8fafc;
}