:root {
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --accent-color: #10b981;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Noto Sans KR', sans-serif;
    --bottom-nav-height: 60px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-body);
    padding-bottom: calc(var(--bottom-nav-height) + 20px);
    overflow-x: hidden;
}

/* Header */
.mobile-header {
    background: var(--bg-card);
    padding: 1rem;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.brand {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--text-primary);
}

.brand span {
    color: var(--accent-color);
}

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: var(--bottom-nav-height);
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: 1000;
    box-shadow: 0 -5px 15px rgba(0, 0, 0, 0.05);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 0.75rem;
    text-decoration: none;
    width: 100%;
    height: 100%;
}

.nav-item.active {
    color: var(--accent-color);
}

.nav-icon {
    font-size: 1.2rem;
    margin-bottom: 3px;
}

/* Content Area */
#app {
    padding: 1rem;
}

/* Cards */
.card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 1rem;
    margin-bottom: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.02);
    border: 1px solid var(--border-color);
}

/* Buttons */
.btn {
    display: block;
    width: 100%;
    padding: 0.8rem;
    background: var(--accent-color);
    color: white;
    text-align: center;
    border-radius: 8px;
    border: none;
    font-weight: 600;
    font-size: 1rem;
    margin-top: 1rem;
    cursor: pointer;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

/* Category Grid */
.category-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.8rem;
    margin-bottom: 1.5rem;
}

.cat-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
    color: var(--text-secondary);
}

.cat-btn.active {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

/* Product List */
.product-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 0;
    border-bottom: 1px solid var(--border-color);
}

.product-item:last-child {
    border-bottom: none;
}

.prod-info {
    flex: 1;
}

.prod-name {
    font-weight: 500;
    margin-bottom: 0.2rem;
    font-size: 0.95rem;
}

.prod-brand {
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: #f1f5f9;
    padding: 2px 6px;
    border-radius: 4px;
    display: inline-block;
    margin-bottom: 4px;
}

.prod-price {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--accent-color);
    font-size: 1.1rem;
}

/* Utilities */
.text-center {
    text-align: center;
}

.mb-1 {
    margin-bottom: 1rem;
}

.mb-2 {
    margin-bottom: 2rem;
}

/* Inquiry */
.inquiry-list-item {
    background: var(--bg-card);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    margin-bottom: 0.8rem;
}

.input-field {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    margin-bottom: 0.8rem;
    font-size: 1rem;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal-content {
    background: white;
    width: 100%;
    max-width: 400px;
    padding: 1.5rem;

    border-radius: 12px;
}

/* Scroll to Top Button */
.scroll-to-top {
    position: fixed;
    bottom: calc(var(--bottom-nav-height) + 20px);
    right: 20px;
    width: 45px;
    height: 45px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--text-primary);
    cursor: pointer;
    z-index: 1500;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    -webkit-tap-highlight-color: transparent;
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-to-top:active {
    transform: scale(0.95);
    background: #f1f5f9;
}