:root {
    --nano-primary: #1f5fbf;
    --nano-primary-d: #1a4f9e;
    --nano-dark: #16243a;
    --nano-sidebar: #1b2940;
    --nano-bg: #f4f6fb;
}

html, body { height: 100%; }
body { background: var(--nano-bg); font-family: "Segoe UI", Tahoma, sans-serif; margin: 0; color: #2b3648; }

/* ---- layout shell ---- */
.app-shell { display: flex; min-height: 100vh; }
.sidebar {
    width: 240px; background: var(--nano-sidebar); color: #cdd6e6;
    flex-shrink: 0; padding: 0 0 1rem;
    position: sticky; top: 0; height: 100vh; overflow-y: auto;
}
.brand { color: #fff; font-size: 1.25rem; font-weight: 700; padding: 1rem 1.25rem; letter-spacing: .5px; }
.brand span { color: #7fb0ff; font-weight: 400; }
.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }

/* ---- sidebar nav ---- */
.nav-menu { display: flex; flex-direction: column; }
.nav-home, .nav-item {
    color: #cdd6e6; text-decoration: none; padding: .5rem 1.25rem; font-size: .92rem;
    border-left: 3px solid transparent; transition: background .12s, border-color .12s;
}
.nav-home { font-weight: 600; color: #fff; }
.nav-home:hover, .nav-item:hover { background: rgba(255,255,255,.07); color: #fff; }
.nav-item.active, .nav-home.active {
    background: rgba(31,95,191,.22); color: #fff; border-left-color: var(--nano-primary);
}
.nav-group-title {
    text-transform: uppercase; font-size: .7rem; letter-spacing: .6px;
    color: #6f81a3; padding: .9rem 1.25rem .25rem;
}

/* ---- topbar ---- */
.topbar {
    display: flex; align-items: center; gap: 1rem;
    background: #fff; border-bottom: 1px solid #e3e8f0; padding: .6rem 1.5rem;
    position: sticky; top: 0; z-index: 10;
}
.topbar .spacer { flex: 1; }
.user-box { text-align: right; line-height: 1.15; }
.user-name { font-weight: 600; color: var(--nano-dark); }
.user-meta { font-size: .78rem; color: #7a869a; }
.logout-form { margin: 0; }

.content { padding: 1.5rem; }

/* ---- responsive: hamburger + off-canvas sidebar ---- */
.sidebar-toggle {
    display: none; background: none; border: 0; font-size: 1.4rem; line-height: 1;
    color: var(--nano-dark); cursor: pointer; padding: .25rem .5rem; margin-right: .25rem;
}
.topbar-brand { display: none; font-weight: 700; color: var(--nano-dark); font-size: 1.1rem; }
.topbar-brand span { color: var(--nano-primary); font-weight: 400; }
.sidebar-overlay { display: none; }

@media (max-width: 991.98px) {
    .sidebar {
        position: fixed; top: 0; left: 0; height: 100vh; z-index: 1050;
        transform: translateX(-100%); transition: transform .22s ease;
        box-shadow: 2px 0 14px rgba(0,0,0,.25);
    }
    .sidebar.open { transform: translateX(0); }
    .sidebar-overlay.show {
        display: block; position: fixed; inset: 0; background: rgba(0,0,0,.45); z-index: 1040;
    }
    .sidebar-toggle { display: inline-flex; }
    .topbar-brand { display: inline-block; }
    .content { padding: 1rem; }
    .so-save-bar { margin: 0 -1rem -1rem; flex-wrap: wrap; }
}

@media (max-width: 575.98px) {
    .filter-bar { padding: .6rem; }
    .filter-bar .form-control, .filter-bar .form-select { max-width: 100%; }
    .page-title { font-size: 1.2rem; }
}

/* ---- page elements ---- */
.page-title { font-size: 1.4rem; font-weight: 700; color: var(--nano-dark); margin-bottom: 1.25rem; }
.card-soft { background: #fff; border: 1px solid #e6eaf2; border-radius: 10px; }

/* ---- filter bar (โมเดิร์น การ์ดเดียว) ---- */
.filter-bar {
    display: flex; flex-wrap: wrap; gap: .6rem; align-items: center;
    background: #fff; border: 1px solid #e6eaf2; border-radius: 10px;
    padding: .85rem 1rem; margin-bottom: 1rem;
}
.filter-bar .form-control, .filter-bar .form-select { max-width: 210px; }

/* ---- tables ---- */
table.table { font-size: .9rem; }
table.table thead th { background: #f3f6fb; color: #46566e; border-bottom: 1px solid #e3e8f0; }
.table-hover tbody tr:hover { background: #f7faff; }

/* ---- dashboard cards ---- */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1rem; }
.stat-card { background: #fff; border: 1px solid #e6eaf2; border-radius: 10px; padding: 1.1rem 1.25rem; }
.stat-card .label { color: #7a869a; font-size: .82rem; }
.stat-card .value { font-size: 1.6rem; font-weight: 700; color: var(--nano-dark); }

/* ---- sale order entry ---- */
.so-section { background: #fff; border: 1px solid #e6eaf2; border-radius: 10px; padding: 1rem 1.25rem; margin-bottom: 1rem; }
.so-section > .so-head { font-weight: 700; color: var(--nano-dark); margin-bottom: .85rem; display: flex; align-items: center; gap: .5rem; }
.so-section > .so-head .num { background: var(--nano-primary); color: #fff; width: 22px; height: 22px; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; font-size: .8rem; }
.cust-info { font-size: .85rem; color: #4a5568; margin-top: .35rem; min-height: 1.1rem; }
.cust-info b { color: var(--nano-dark); }
.add-line-bar { background: #f3f6fb; border: 1px dashed #c7d2e6; border-radius: 8px; padding: .75rem; }
.so-save-bar {
    position: sticky; bottom: 0; background: #fff; border-top: 1px solid #e3e8f0;
    padding: .75rem 1rem; display: flex; align-items: center; gap: 1rem; margin: 0 -1.5rem -1.5rem;
    box-shadow: 0 -4px 12px rgba(0,0,0,.05);
}
.so-save-bar .grand { font-size: 1.3rem; font-weight: 700; color: var(--nano-primary); }

/* ---- login ---- */
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: var(--nano-dark); }
.login-card { background: #fff; border-radius: 12px; padding: 2.25rem; width: 360px; box-shadow: 0 12px 40px rgba(0,0,0,.3); }
.login-card .brand { color: var(--nano-dark); padding: 0 0 1rem; text-align: center; }
.login-card .brand span { color: var(--nano-primary); }