/* ============================================================
   Milan Power Costing Calculator
   Design: clean light theme, white surfaces on a soft blue-grey
   ground, single blue accent. Built for clarity on a data-dense
   costing tool - tables are the star, so alignment and rhythm
   matter more than decoration.
   ============================================================ */

:root {
    --blue-700: #1d4ed8;
    --blue-600: #2563eb;
    --blue-500: #3b82f6;
    --blue-100: #dbeafe;
    --blue-50:  #eff6ff;

    --slate-900: #0f172a;
    --slate-700: #334155;
    --slate-500: #64748b;
    --slate-300: #cbd5e1;
    --slate-200: #e2e8f0;
    --slate-100: #f1f5f9;

    --surface: #ffffff;
    --ground: #f4f6fb;
    --border: #e2e8f0;

    --ok-600: #16a34a;
    --ok-bg: #ecfdf3;
    --danger-600: #dc2626;
    --danger-bg: #fef2f2;
    --amber-600: #d97706;
    --amber-bg: #fffbeb;

    --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
    --font-body: 'Inter', 'Segoe UI', sans-serif;
    --font-mono: 'IBM Plex Mono', 'Consolas', monospace;

    --radius-sm: 6px;
    --radius-md: 10px;
    --shadow-card: 0 1px 2px rgba(15,23,42,0.04), 0 2px 8px rgba(15,23,42,0.06);
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--ground);
    color: var(--slate-900);
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--blue-600); text-decoration: none; }

/* ---------- Layout shell ---------- */

.app-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.topbar {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    flex-shrink: 0;
    position: sticky;
    top: 0;
    z-index: 40;
}

.topbar__brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 17px;
    letter-spacing: 0.2px;
    color: var(--slate-900);
}

.topbar__mark {
    width: 30px;
    height: 30px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--blue-600), var(--blue-500));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
    color: #fff;
    flex-shrink: 0;
}

.topbar__brand small {
    display: block;
    font-family: var(--font-body);
    font-weight: 400;
    font-size: 11px;
    color: var(--slate-500);
    letter-spacing: 0.3px;
    margin-top: 1px;
}

nav.tabs {
    display: flex;
    gap: 4px;
    align-items: center;
}

nav.tabs a {
    padding: 9px 16px;
    border-radius: var(--radius-sm);
    font-size: 13.5px;
    font-weight: 500;
    color: var(--slate-500);
    transition: background 0.15s, color 0.15s;
}

nav.tabs a:hover { background: var(--slate-100); color: var(--slate-900); }
nav.tabs a.active { background: var(--blue-50); color: var(--blue-700); }

nav.tabs .tabs__divider {
    width: 1px;
    height: 22px;
    background: var(--border);
    margin: 0 6px;
}

nav.tabs a.nav-logout { color: var(--danger-600); }
nav.tabs a.nav-logout:hover { background: var(--danger-bg); }

.menu-toggle {
    display: none;
    background: none;
    border: 1px solid var(--border);
    color: var(--slate-900);
    border-radius: var(--radius-sm);
    padding: 8px 10px;
    font-size: 16px;
}

main.content {
    flex: 1;
    width: 100%;
    max-width: 1180px;
    margin: 0 auto;
    padding: 28px 20px 60px;
}

.page-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 22px;
}

.page-head h1 {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 600;
    color: var(--slate-900);
    margin: 0 0 4px;
}

.page-head p.subtitle {
    margin: 0;
    color: var(--slate-500);
    font-size: 13.5px;
}

/* ---------- Buttons ---------- */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 9px 16px;
    border-radius: var(--radius-sm);
    font-size: 13.5px;
    font-weight: 600;
    border: 1px solid transparent;
    cursor: pointer;
    font-family: var(--font-body);
    white-space: nowrap;
    transition: filter 0.15s, background 0.15s, border-color 0.15s;
}

.btn-primary { background: var(--blue-600); color: #fff; }
.btn-primary:hover { background: var(--blue-700); }

.btn-ghost { background: var(--surface); border-color: var(--border); color: var(--slate-700); }
.btn-ghost:hover { background: var(--slate-100); border-color: var(--slate-300); }

.btn-danger { background: var(--surface); border-color: var(--danger-600); color: var(--danger-600); }
.btn-danger:hover { background: var(--danger-bg); }

.btn-sm { padding: 6px 11px; font-size: 12.5px; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ---------- Cards / surfaces ---------- */

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
}

.card + .card { margin-top: 18px; }
.card__body { padding: 20px; }
.card__header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
}
.card__header h2 {
    font-family: var(--font-display);
    font-size: 15.5px;
    font-weight: 600;
    margin: 0;
    color: var(--slate-900);
}

/* ---------- Forms ---------- */

.field { margin-bottom: 16px; }
.field label {
    display: block;
    font-size: 12.5px;
    font-weight: 600;
    color: var(--slate-700);
    margin-bottom: 6px;
    letter-spacing: 0.2px;
}
.field .hint { font-size: 11.5px; color: var(--slate-500); margin-top: 5px; }

input[type=text], input[type=number], input[type=search], input[type=password], select {
    width: 100%;
    background: var(--surface);
    border: 1px solid var(--slate-300);
    color: var(--slate-900);
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: var(--font-body);
    transition: border-color 0.15s, box-shadow 0.15s;
}

input::placeholder { color: var(--slate-500); opacity: 0.8; }

input:focus, select:focus {
    outline: none;
    border-color: var(--blue-500);
    box-shadow: 0 0 0 3px var(--blue-100);
}

input.invalid { border-color: var(--danger-600); }

.form-row { display: flex; gap: 14px; flex-wrap: wrap; }
.form-row .field { flex: 1; min-width: 160px; }

/* ---------- Tables ----------
   Consistent th/td box model keeps every column the same width
   in header and body rows - that's what actually causes
   "misaligned" tables if left inconsistent. */

.table-wrap { overflow-x: auto; }

table.data {
    width: 100%;
    border-collapse: collapse;
    font-size: 13.5px;
}

table.data th,
table.data td {
    padding: 12px 14px;
    text-align: left;
    vertical-align: middle;
    box-sizing: border-box;
}

table.data th {
    font-size: 11.5px;
    font-weight: 600;
    letter-spacing: 0.4px;
    text-transform: uppercase;
    color: var(--slate-500);
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
    background: var(--slate-100);
}

table.data td {
    border-bottom: 1px solid var(--slate-100);
    color: var(--slate-900);
}

table.data tr:last-child td { border-bottom: none; }
table.data tbody tr:hover td { background: var(--blue-50); }

/* Right-aligned numeric/action columns - th and td share the exact
   same class so they always agree on alignment. */
td.num, th.num { text-align: right; font-family: var(--font-mono); }
td.num.actions-cell, th.num.actions-cell { font-family: var(--font-body); white-space: nowrap; }

.empty-state {
    text-align: center;
    padding: 50px 20px;
    color: var(--slate-500);
}
.empty-state strong { display: block; color: var(--slate-900); margin-bottom: 4px; font-size: 14.5px; }

/* ---------- Badges / pills ---------- */

.pill {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 100px;
    font-size: 11.5px;
    font-weight: 600;
    background: var(--slate-100);
    color: var(--slate-700);
}
.pill-amber { background: var(--amber-bg); color: var(--amber-600); }
.pill-ok { background: var(--ok-bg); color: var(--ok-600); }
.pill-danger { background: var(--danger-bg); color: var(--danger-600); }

/* ---------- Alerts ---------- */

.alert {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 13.5px;
    margin-bottom: 18px;
    border: 1px solid transparent;
}
.alert-success { background: var(--ok-bg); border-color: #bbf0cf; color: #0f7a3b; }
.alert-error { background: var(--danger-bg); border-color: #fbcfcf; color: #b42318; }

/* ---------- Weight balance meter (product builder) ---------- */

.weight-meter {
    background: var(--slate-100);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 14px 16px;
    margin-bottom: 16px;
}
.weight-meter__row {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    margin-bottom: 8px;
}
.weight-meter__row strong { font-family: var(--font-mono); color: var(--slate-900); }
.weight-meter__bar {
    height: 8px;
    background: var(--slate-200);
    border-radius: 100px;
    overflow: hidden;
}
.weight-meter__fill {
    height: 100%;
    background: var(--blue-500);
    transition: width 0.2s ease, background 0.2s ease;
}
.weight-meter__fill.over { background: var(--danger-600); }
.weight-meter__fill.balanced { background: var(--ok-600); }
.weight-meter__remaining { font-family: var(--font-mono); }
.weight-meter__remaining.zero { color: var(--ok-600); }
.weight-meter__remaining.negative { color: var(--danger-600); }

/* ---------- Material row in product builder ---------- */

.material-row {
    display: grid;
    grid-template-columns: 1fr 130px 130px 36px;
    gap: 10px;
    align-items: center;
    margin-bottom: 10px;
}
.material-row .line-cost {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--slate-700);
    text-align: right;
}
.material-row .remove-btn {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--danger-600);
    border-radius: var(--radius-sm);
    width: 34px;
    height: 34px;
    cursor: pointer;
    font-size: 16px;
    line-height: 1;
}
.material-row .remove-btn:hover { background: var(--danger-bg); }

/* ---------- Cost breakdown panel ---------- */

.breakdown {
    font-family: var(--font-mono);
    font-size: 13.5px;
}
.breakdown__row {
    display: flex;
    justify-content: space-between;
    padding: 9px 0;
    border-bottom: 1px solid var(--slate-100);
}
.breakdown__row.total {
    border-bottom: none;
    border-top: 2px solid var(--border);
    margin-top: 6px;
    padding-top: 14px;
    font-size: 17px;
    font-weight: 700;
    color: var(--blue-700);
    font-family: var(--font-display);
}
.breakdown__label { color: var(--slate-500); font-family: var(--font-body); font-size: 13px; }
.breakdown__row.total .breakdown__label { color: var(--slate-900); font-weight: 600; }

/* ---------- Search bar ---------- */

.search-bar { position: relative; max-width: 320px; }
.search-bar input { padding-left: 36px; }
.search-bar::before {
    content: "⌕";
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--slate-500);
    font-size: 15px;
}

/* ---------- Modal (used for delete confirm) ---------- */

.modal-backdrop {
    position: fixed; inset: 0;
    background: rgba(15,23,42,0.45);
    display: none;
    align-items: center; justify-content: center;
    z-index: 100;
    padding: 20px;
}
.modal-backdrop.open { display: flex; }
.modal {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    max-width: 380px;
    width: 100%;
    padding: 22px;
    box-shadow: 0 12px 32px rgba(15,23,42,0.18);
}
.modal h3 { margin: 0 0 8px; font-family: var(--font-display); color: var(--slate-900); font-size: 16px; }
.modal p { color: var(--slate-500); font-size: 13.5px; margin: 0 0 18px; }
.modal__actions { display: flex; gap: 10px; justify-content: flex-end; }

/* ---------- Login page ---------- */

body.login-body {
    background: linear-gradient(160deg, var(--blue-50), var(--ground) 60%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}
.login-wrap {
    width: 100%;
    padding: 20px;
    display: flex;
    justify-content: center;
}
.login-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: 0 8px 28px rgba(15,23,42,0.08);
    padding: 32px;
    width: 100%;
    max-width: 380px;
}
.login-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 18px;
    color: var(--slate-900);
    margin-bottom: 26px;
}
.login-brand small {
    display: block;
    font-family: var(--font-body);
    font-weight: 400;
    font-size: 11.5px;
    color: var(--slate-500);
    margin-top: 1px;
}

/* ---------- Footer ---------- */

footer.app-footer {
    text-align: center;
    color: var(--slate-500);
    font-size: 12px;
    padding: 18px;
}

/* ============================================================
   Mobile responsive
   ============================================================ */

@media (max-width: 820px) {
    nav.tabs {
        position: fixed;
        top: 64px; left: 0; right: 0;
        background: var(--surface);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        align-items: stretch;
        padding: 8px;
        display: none;
        z-index: 50;
        box-shadow: 0 8px 16px rgba(15,23,42,0.06);
    }
    nav.tabs.open { display: flex; }
    nav.tabs a { padding: 12px 14px; }
    nav.tabs .tabs__divider { display: none; }
    .menu-toggle { display: block; }
    main.content { padding: 20px 14px 50px; }
}

@media (max-width: 600px) {
    .material-row {
        grid-template-columns: 1fr 1fr;
        grid-template-areas:
            "name name"
            "qty cost"
            "remove remove";
    }
    .material-row select { grid-area: name; }
    .material-row input { grid-area: qty; }
    .material-row .line-cost { grid-area: cost; }
    .material-row .remove-btn { grid-area: remove; width: 100%; }

    .page-head { flex-direction: column; align-items: stretch; }
    .page-head .btn { width: 100%; justify-content: center; }

    table.data thead { display: none; }
    table.data tr {
        display: block;
        border: 1px solid var(--slate-100);
        border-radius: var(--radius-sm);
        margin-bottom: 10px;
        background: var(--surface);
    }
    table.data tbody tr:hover td { background: transparent; }
    table.data td {
        display: flex;
        justify-content: space-between;
        align-items: center;
        gap: 12px;
        border-bottom: 1px solid var(--slate-100);
        text-align: right;
    }
    table.data tr td:last-child { border-bottom: none; }
    table.data td::before {
        content: attr(data-label);
        font-size: 11px;
        font-weight: 600;
        text-transform: uppercase;
        color: var(--slate-500);
        flex-shrink: 0;
        text-align: left;
    }
}