:root {
    --nbp-primary: #0e6b63;      /* deep teal */
    --nbp-primary-dark: #0a514b;
    --nbp-accent: #16a39a;       /* bright teal */
    --nbp-accent-2: #2f8fd8;     /* support blue */
    --nbp-ink: #16302e;
    --nbp-muted: #6b7d7b;
    --nbp-bg: #f4f7f6;
    --nbp-card: #ffffff;
    --nbp-border: #e4ebe9;
    --nbp-radius: 14px;
    --nbp-shadow: 0 8px 28px rgba(14, 107, 99, .08);
    --nbp-shadow-sm: 0 2px 10px rgba(20, 48, 46, .06);
}

* { box-sizing: border-box; }

body {
    background: var(--nbp-bg);
    color: var(--nbp-ink);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ---------- Top navigation ---------- */
.app-navbar {
    background: #fff;
    border-bottom: 1px solid var(--nbp-border);
    box-shadow: var(--nbp-shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1030;
}
.app-brand {
    display: flex;
    align-items: center;
    gap: .65rem;
    text-decoration: none;
    color: var(--nbp-ink);
}
.app-brand .logo-badge {
    width: 42px; height: 42px;
    border-radius: 11px;
    background: linear-gradient(135deg, var(--nbp-primary), var(--nbp-accent));
    color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 1.15rem;
    box-shadow: 0 4px 12px rgba(14,107,99,.25);
}
.app-brand .brand-text { line-height: 1.1; }
.app-brand .brand-name { font-weight: 700; font-size: 1.02rem; }
.app-brand .brand-sub { font-size: .68rem; color: var(--nbp-muted); letter-spacing: .02em; }

.app-nav-link {
    color: var(--nbp-ink);
    font-weight: 500;
    padding: .5rem .9rem;
    border-radius: 9px;
    text-decoration: none;
    display: inline-flex; align-items: center; gap: .45rem;
    transition: all .15s ease;
}
.app-nav-link:hover { background: var(--nbp-bg); color: var(--nbp-primary); }
.app-nav-link.active { background: rgba(22,163,154,.12); color: var(--nbp-primary); }
.app-nav-link i { width: 1.1rem; text-align: center; }

.user-chip {
    display: flex; align-items: center; gap: .55rem;
    background: var(--nbp-bg);
    border-radius: 30px;
    padding: .3rem .35rem .3rem .85rem;
}
.user-chip .avatar {
    width: 34px; height: 34px; border-radius: 50%;
    background: var(--nbp-primary); color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-weight: 600; font-size: .85rem;
}

/* ---------- Layout shell ---------- */
.app-main { flex: 1; padding: 2rem 0 3rem; }
.page-head { margin-bottom: 1.5rem; }
.page-head h1 { font-weight: 700; font-size: 1.55rem; margin: 0; }
.page-head .subtitle { color: var(--nbp-muted); margin-top: .25rem; }
.eyebrow { text-transform: uppercase; letter-spacing: .08em; font-size: .72rem; font-weight: 700; color: var(--nbp-accent); }

/* ---------- Cards ---------- */
.card-soft {
    background: var(--nbp-card);
    border: 1px solid var(--nbp-border);
    border-radius: var(--nbp-radius);
    box-shadow: var(--nbp-shadow-sm);
}
.card-soft .card-header {
    background: transparent;
    border-bottom: 1px solid var(--nbp-border);
    font-weight: 600;
    padding: 1rem 1.25rem;
}
.card-soft .card-body { padding: 1.25rem; }

/* ---------- Stat cards ---------- */
.stat-card {
    background: var(--nbp-card);
    border: 1px solid var(--nbp-border);
    border-radius: var(--nbp-radius);
    padding: 1.2rem 1.3rem;
    box-shadow: var(--nbp-shadow-sm);
    height: 100%;
    position: relative;
    overflow: hidden;
}
.stat-card .stat-icon {
    width: 46px; height: 46px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem; color: #fff; margin-bottom: .8rem;
    background: linear-gradient(135deg, var(--nbp-primary), var(--nbp-accent));
}
.stat-card .stat-value { font-size: 1.9rem; font-weight: 700; line-height: 1; }
.stat-card .stat-label { color: var(--nbp-muted); font-size: .85rem; margin-top: .3rem; }
.stat-card.alt .stat-icon { background: linear-gradient(135deg, var(--nbp-accent-2), #5bb6ec); }

/* ---------- Buttons ---------- */
.btn-nbp {
    background: var(--nbp-primary); color: #fff; border: none;
    border-radius: 10px; font-weight: 600; padding: .6rem 1.3rem;
    transition: all .15s ease;
}
.btn-nbp:hover { background: var(--nbp-primary-dark); color: #fff; transform: translateY(-1px); }
.btn-nbp-outline {
    background: #fff; color: var(--nbp-primary); border: 1.5px solid var(--nbp-primary);
    border-radius: 10px; font-weight: 600; padding: .6rem 1.3rem;
}
.btn-nbp-outline:hover { background: var(--nbp-primary); color: #fff; }

/* ---------- Format badge ---------- */
.format-badge {
    display: inline-flex; align-items: center; gap: .5rem;
    padding: .55rem 1.1rem; border-radius: 30px; font-weight: 700;
    font-size: 1.05rem;
}
.format-badge.tatmeen { background: rgba(47,143,216,.12); color: #1d6fb8; }
.format-badge.eptts { background: rgba(22,163,154,.14); color: var(--nbp-primary); }
.format-badge.custom { background: rgba(126,87,194,.12); color: #6a3fb0; }
.format-badge i { font-size: 1.1rem; }

/* ---------- Dropzone ---------- */
.dropzone {
    border: 2.5px dashed var(--nbp-border);
    border-radius: var(--nbp-radius);
    background: var(--nbp-card);
    padding: 3rem 2rem; text-align: center;
    transition: all .2s ease; cursor: pointer;
}
.dropzone:hover, .dropzone.dragover {
    border-color: var(--nbp-accent);
    background: rgba(22,163,154,.04);
}
.dropzone .dz-icon {
    width: 72px; height: 72px; border-radius: 50%;
    background: rgba(22,163,154,.12); color: var(--nbp-primary);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.8rem; margin: 0 auto 1rem;
}

/* ---------- Aggregation tree ---------- */
.tree { list-style: none; padding-left: 0; }
.tree ul { list-style: none; padding-left: 1.6rem; border-left: 1.5px dashed var(--nbp-border); margin-left: .6rem; }
.tree li { margin: .35rem 0; }
.node-chip {
    display: inline-flex; align-items: center; gap: .5rem;
    padding: .35rem .75rem; border-radius: 9px; font-size: .85rem;
    border: 1px solid var(--nbp-border); background: #fff;
}
.node-pallet { border-left: 4px solid #e0a800; }
.node-case { border-left: 4px solid var(--nbp-accent-2); }
.node-item { border-left: 4px solid var(--nbp-accent); }
.node-standalone { border-left: 4px solid #d36c6c; }
.tree-toggle {
    border: none; background: transparent; color: var(--nbp-muted); cursor: pointer;
    width: 18px; height: 18px; padding: 0; display: inline-flex; align-items: center; justify-content: center;
    transition: transform .15s ease;
}
.tree-toggle:hover { color: var(--nbp-primary); }
.tree-toggle i { font-size: .7rem; transition: transform .15s ease; }
.tree-li.collapsed > .node-chip .tree-toggle i { transform: rotate(-90deg); }
.tree-li.collapsed > ul { display: none; }
.tree-toggle-spacer { display: inline-block; width: 18px; }

/* ---------- Timeline ---------- */
.timeline { position: relative; padding-left: 2rem; }
.timeline::before { content: ''; position: absolute; left: .65rem; top: .3rem; bottom: .3rem; width: 2px; background: var(--nbp-border); }
.timeline-item { position: relative; margin-bottom: 1rem; }
.timeline-item .dot {
    position: absolute; left: -1.72rem; top: .15rem; width: 1.35rem; height: 1.35rem;
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    color: #fff; font-size: .65rem;
}

/* ---------- Misc ---------- */
.code-pre {
    background: #0f201e; color: #b9f4e9; border-radius: 12px;
    padding: 1rem 1.2rem; font-family: 'Consolas', monospace; font-size: .8rem;
    max-height: 360px; overflow: auto; white-space: pre; margin: 0;
}
.mono { font-family: 'Consolas', monospace; font-size: .82rem; }
.text-muted-2 { color: var(--nbp-muted); }
.app-footer { background: #fff; border-top: 1px solid var(--nbp-border); padding: 1rem 0; color: var(--nbp-muted); font-size: .85rem; }
.powered-by { display: inline-flex; align-items: center; gap: .35rem; font-weight: 600; color: var(--nbp-primary); }

.fade-up { animation: fadeUp .4s ease both; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

.chart-box { position: relative; height: 240px; }
.chart-box-sm { position: relative; height: 220px; }
.toggle-pill .btn { border-radius: 30px; }
table.clean { font-size: .85rem; }
table.clean thead th { background: var(--nbp-bg); border-bottom: 2px solid var(--nbp-border); font-size: .76rem; text-transform: uppercase; letter-spacing: .03em; color: var(--nbp-muted); }