:root {
    --primary-color: #6366f1;
    --secondary-color: #a855f7;
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --accent-green: #10b981;
}

body {
    margin: 0;
    font-family: 'Outfit', sans-serif;
    background: var(--bg-gradient);
    color: var(--text-color);
    min-height: 100vh;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Glassmorphism Utilities */
.glass-nav,
.glass-card,
.glass-footer {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

/* Navigation */
.glass-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    margin-bottom: 2rem;
}

.back-link {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.back-link:hover {
    color: var(--text-color);
}

.logo {
    font-weight: 700;
    font-size: 1.2rem;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Main Layout */
.tool-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
}

@media (max-width: 768px) {
    .tool-wrapper {
        grid-template-columns: 1fr;
    }
}

.glass-card {
    padding: 2rem;
}

/* Inputs Section */
.tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    background: rgba(0, 0, 0, 0.2);
    padding: 0.5rem;
    border-radius: 12px;
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.8rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s;
}

.common-inputs {
    margin-top: 1rem;
    padding-top: 1rem;
}

.tab-btn.active {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 2px 10px rgba(99, 102, 241, 0.3);
}

.input-group {
    display: none;
    animation: fadeIn 0.3s ease;
}

.input-group.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }

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

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.form-group label i {
    margin-right: 0.5rem;
    color: var(--primary-color);
}

input[type="number"],
input[type="text"] {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--glass-border);
    padding: 1rem;
    border-radius: 10px;
    color: white;
    font-size: 1.1rem;
    font-family: inherit;
    transition: border-color 0.3s;
    box-sizing: border-box;
    /* Fix width issue */
}

input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Counter Input */
.counter-input {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.counter-input button {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    border: none;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    transition: background 0.3s;
}

.counter-input button:hover {
    background: rgba(255, 255, 255, 0.2);
}

.counter-input input {
    text-align: center;
    width: 60px;
}

/* Tip Options */
.tip-options {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tip-btn {
    flex: 1;
    min-width: 60px;
    padding: 0.8rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.3s;
}

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

#custom-tip {
    width: 80px;
    padding: 0.8rem;
}

/* Itemized List */
.people-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1rem;
}

.person-row {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.person-row input[type="text"] {
    flex: 2;
}

.person-row input[type="number"] {
    flex: 1;
}

.remove-btn {
    background: transparent;
    border: none;
    color: #ef4444;
    cursor: pointer;
    padding: 0.5rem;
}

.add-btn {
    width: 100%;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px dashed var(--glass-border);
    border-radius: 10px;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.3s;
}

.add-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

/* Results Section */
.result-section h2 {
    margin-top: 0;
    margin-bottom: 2rem;
    font-size: 1.5rem;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 1rem;
}

.result-summary {
    background: rgba(0, 0, 0, 0.2);
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 2rem;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.8rem;
    color: var(--text-muted);
}

.summary-row.total {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--glass-border);
    color: white;
    font-weight: 700;
    font-size: 1.2rem;
}

.split-result {
    text-align: center;
    padding: 2rem;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(168, 85, 247, 0.1) 100%);
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 2rem;
}

.per-person .label {
    display: block;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.8rem;
}

.per-person .amount {
    display: block;
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent-green);
    text-shadow: 0 0 20px rgba(16, 185, 129, 0.3);
}

.itemized-list {
    margin-bottom: 2rem;
}

.itemized-row {
    display: flex;
    justify-content: space-between;
    padding: 1rem;
    border-bottom: 1px solid var(--glass-border);
}

.itemized-row:last-child {
    border-bottom: none;
}

.share-btn {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    border: none;
    border-radius: 10px;
    color: white;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.share-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.action-buttons-row {
    display: flex;
    gap: 1rem;
}

.share-btn,
.download-btn {
    flex: 1;
    padding: 1rem;
    border: none;
    border-radius: 10px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 0.2s;
    color: white;
}

.share-btn {
    background: var(--primary-color);
}

.download-btn {
    background: var(--secondary-color);
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(168, 85, 247, 0.4);
}

/* Receipt Styles (Hidden) */
.receipt-paper {
    width: 350px;
    background: #fff;
    padding: 2rem;
    color: #333;
    font-family: 'Courier New', Courier, monospace;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
}

.receipt-header {
    text-align: center;
    margin-bottom: 1rem;
}

.receipt-header h2 {
    font-size: 1.5rem;
    margin: 0 0 0.5rem 0;
    letter-spacing: 2px;
}

.dashed-line {
    border-bottom: 2px dashed #333;
    margin: 1rem 0;
}

.r-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.r-row.total {
    font-weight: bold;
    font-size: 1.2rem;
    margin-top: 0.5rem;
}

.receipt-footer {
    text-align: center;
    margin-top: 1rem;
    font-size: 0.8rem;
    color: #666;
}

/* SEO Content */
.seo-content {
    color: var(--text-muted);
    line-height: 1.8;
}

.seo-content h2,
.seo-content h3 {
    color: white;
    margin-top: 2rem;
}

.glass-footer {
    text-align: center;
    padding: 1rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}