:root {
    --bg: #f8fafc;
    --surface: #ffffff;
    --surface-soft: #f1f5f9;
    --text: #0f172a;
    --muted: #64748b;
    --border: #e2e8f0;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #047857;
    --danger: #dc2626;
    --radius: 14px;
}

* {
    box-sizing: border-box;
}

body.store-body {
    margin: 0;
    font-family: "Inter", "Segoe UI", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 0% 0%, rgba(37, 99, 235, 0.08), transparent 32%),
        radial-gradient(circle at 100% 0%, rgba(15, 23, 42, 0.06), transparent 28%),
        var(--bg);
}

a {
    color: inherit;
}

.store-nav {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255, 255, 255, 0.84);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(8px);
}

.store-nav-inner,
.store-container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 20px;
}

.store-nav-inner {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.brand {
    text-decoration: none;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.store-links {
    display: flex;
    align-items: center;
    gap: 10px;
}

.btn {
    appearance: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 10px 14px;
    background: var(--surface);
    color: var(--text);
    text-decoration: none;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: 0.15s ease;
}

.btn:hover {
    border-color: #cbd5e1;
    transform: translateY(-1px);
}

.btn-primary {
    border-color: var(--primary);
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-danger {
    color: var(--danger);
    border-color: #fecaca;
    background: #fff;
}

.btn-block {
    width: 100%;
}

.stack {
    display: grid;
    gap: 10px;
}

.store-main {
    padding: 28px 0 44px;
}

.page-head {
    margin-bottom: 14px;
}

.page-title {
    margin: 0 0 4px;
    font-size: 28px;
    line-height: 1.15;
    letter-spacing: -0.02em;
}

.muted {
    color: var(--muted);
}

.search-row {
    margin-bottom: 16px;
}

.search-form {
    display: flex;
    gap: 10px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px;
}

.input {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 11px 12px;
    font-size: 14px;
    background: #fff;
}

.input:focus {
    outline: none;
    border-color: #93c5fd;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.store-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    padding: 16px;
    box-shadow: 0 6px 18px rgba(15, 23, 42, 0.04);
}

.session-card {
    display: grid;
    gap: 8px;
}

.session-title {
    margin: 0;
    font-size: 18px;
    line-height: 1.25;
}

.price {
    margin: 4px 0 8px;
    font-size: 21px;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.detail-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 330px;
    gap: 16px;
}

.detail-text {
    line-height: 1.65;
}

.form-wrap {
    max-width: 460px;
    margin: 40px auto 0;
}

.field {
    margin-bottom: 12px;
}

.field label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 6px;
}

.tiny-error {
    display: inline-block;
    margin-top: 6px;
    color: var(--danger);
    font-size: 12px;
}

.flash {
    border-radius: 12px;
    padding: 11px 12px;
    margin-bottom: 12px;
    font-size: 14px;
}

.flash-success {
    background: #ecfdf5;
    color: var(--success);
    border: 1px solid #a7f3d0;
}

.flash-error {
    background: #fef2f2;
    color: var(--danger);
    border: 1px solid #fecaca;
}

.center-card {
    max-width: 580px;
    margin: 0 auto;
}

@media (max-width: 980px) {
    .store-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .detail-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 700px) {
    .store-nav-inner,
    .store-container {
        padding: 0 14px;
    }

    .store-nav-inner {
        min-height: 62px;
    }

    .store-links {
        gap: 7px;
        flex-wrap: wrap;
        justify-content: flex-end;
    }

    .page-title {
        font-size: 24px;
    }

    .search-form {
        flex-direction: column;
    }

    .search-form .btn {
        width: 100%;
    }
}

@media (max-width: 640px) {
    .store-grid {
        grid-template-columns: 1fr;
    }

    .btn {
        min-height: 42px;
    }
}