/* ==========================================================================
   Ledgerline design system
   Palette:  ink-900 #101B2D (sidebar)   ledger-600 #1F6F54 (brand/active)
             rust-600 #B3452F (overdue)  amber-500 #C9982D (pending)
             paper-50 #F3F6F1 (app bg)   surface #FFFFFF (cards)
   Type:     IBM Plex Sans (UI)  /  IBM Plex Mono (all money + tabular data)
   Signature: faint ledger-rule lines behind stat cards + tabular monospace
              figures everywhere a number represents money or a count.
   ========================================================================== */

:root {
    --ink-900: #101B2D;
    --ink-800: #16243D;
    --ink-700: #24344A;
    --ledger-600: #1F6F54;
    --ledger-700: #175943;
    --ledger-100: #E3F0EA;
    --rust-600: #B3452F;
    --rust-100: #F7E3DD;
    --amber-500: #B8862A;
    --amber-100: #FBF0DA;
    --paper-50: #F3F6F1;
    --surface: #FFFFFF;
    --line: #DFE6DC;
    --muted: #67788A;
    --radius: 8px;
    --shadow-card: 0 1px 2px rgba(16, 27, 45, 0.06), 0 1px 10px rgba(16, 27, 45, 0.04);
    --shadow-pop: 0 12px 28px rgba(16, 27, 45, 0.16);
}

* , *::before, *::after { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--paper-50);
    color: var(--ink-700);
    font-family: 'IBM Plex Sans', 'Segoe UI', Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

.num, .amount, .grid td.num,
.card-number, .doc-totals, .doc-items td.right {
    font-family: 'IBM Plex Mono', 'Consolas', monospace;
    font-variant-numeric: tabular-nums;
}

a { color: var(--ledger-600); }

h1, h2, h3 { font-family: 'IBM Plex Sans', sans-serif; color: var(--ink-900); font-weight: 600; }
h1 { font-size: 21px; margin: 0 0 20px; letter-spacing: -0.01em; }
h3 { font-size: 14px; margin: 22px 0 10px; color: var(--ink-800); text-transform: uppercase; letter-spacing: 0.04em; font-weight: 600; }

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

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

.sidenav {
    width: 250px;
    flex-shrink: 0;
    background: var(--ink-900);
    color: #C9D3DF;
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
    z-index: 40;
}

.brand-block {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 22px 20px;
    background-image: repeating-linear-gradient(
        to bottom,
        rgba(255,255,255,0.05) 0,
        rgba(255,255,255,0.05) 1px,
        transparent 1px,
        transparent 25px
    );
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.brand-mark {
    width: 34px;
    height: 34px;
    border-radius: 8px;
    background: var(--ledger-600);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-name { font-weight: 700; color: #fff; font-size: 15px; letter-spacing: -0.01em; }
.brand-sub { font-size: 11px; color: #8EA0B5; }

.side-nav-scroll {
    flex: 1;
    overflow-y: auto;
    padding: 14px 10px;
}

.nav-section-label {
    font-size: 10.5px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #6D8098;
    padding: 14px 12px 6px;
    font-weight: 600;
}
.nav-section-label:first-child { padding-top: 4px; }

.nav-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    border-radius: 6px;
    color: #C9D3DF;
    text-decoration: none;
    font-size: 13.5px;
    font-weight: 500;
    margin-bottom: 2px;
}

.nav-icon { display: flex; opacity: 0.85; flex-shrink: 0; }

.nav-link:hover { background: rgba(255,255,255,0.06); color: #fff; }

.nav-link.active {
    background: var(--ledger-600);
    color: #fff;
}
.nav-link.active .nav-icon { opacity: 1; }

.sidenav-footer {
    padding: 12px 20px;
    border-top: 1px solid rgba(255,255,255,0.08);
}
.version-tag { font-size: 11px; color: #5E7188; }

.app-main {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.topbar {
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    padding: 12px 24px;
    display: flex;
    align-items: center;
    gap: 14px;
    position: sticky;
    top: 0;
    z-index: 20;
}

.topbar-spacer { flex: 1; }

.nav-toggle {
    display: none;
    background: transparent;
    border: none;
    color: var(--ink-800);
    cursor: pointer;
    padding: 4px;
    border-radius: 6px;
}
.nav-toggle:hover { background: var(--paper-50); }

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

.role-badge {
    font-size: 10.5px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
    color: var(--ledger-700);
    background: var(--ledger-100);
    padding: 4px 9px;
    border-radius: 20px;
}

.avatar-circle {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: var(--ink-800);
    color: #fff;
    font-size: 11.5px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'IBM Plex Mono', monospace;
}

.user-name { font-size: 13.5px; font-weight: 600; color: var(--ink-800); }

.logout-link {
    display: flex;
    align-items: center;
    color: var(--muted);
    padding: 6px;
    border-radius: 6px;
    text-decoration: none;
}
.logout-link:hover { background: var(--rust-100); color: var(--rust-600); }

.nav-scrim {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(16,27,45,0.45);
    z-index: 30;
}
.nav-scrim.show { display: block; }

.content { padding: 26px 28px 48px; max-width: 1280px; width: 100%; }

/* ---------------------------------------------------------------- login */

.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--ink-900);
    background-image:
        repeating-linear-gradient(to bottom, rgba(255,255,255,0.035) 0, rgba(255,255,255,0.035) 1px, transparent 1px, transparent 28px);
    padding: 16px;
    font-family: 'IBM Plex Sans', sans-serif;
}

.login-box {
    background: var(--surface);
    padding: 38px 36px;
    border-radius: 12px;
    width: 360px;
    max-width: 100%;
    box-shadow: var(--shadow-pop);
}

.login-mark {
    width: 42px; height: 42px; border-radius: 10px;
    background: var(--ledger-600); color: #fff;
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 16px;
}

.login-box h2 { margin: 0 0 4px 0; font-size: 19px; color: var(--ink-900); }
.login-box .sub { color: var(--muted); margin-bottom: 22px; font-size: 13px; }

/* ---------------------------------------------------------------- forms */

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 14px;
}

.form-group { display: flex; flex-direction: column; margin-bottom: 14px; }
.form-group label { font-size: 12px; color: var(--ink-800); margin-bottom: 5px; font-weight: 600; }

.form-control {
    padding: 9px 11px;
    border: 1px solid #CCD6D0;
    border-radius: 6px;
    font-size: 13.5px;
    width: 100%;
    font-family: inherit;
    background: var(--surface);
    color: var(--ink-700);
    transition: border-color 0.15s, box-shadow 0.15s;
}
.form-control:focus {
    outline: none;
    border-color: var(--ledger-600);
    box-shadow: 0 0 0 3px var(--ledger-100);
}

textarea.form-control { resize: vertical; }

/* ---------------------------------------------------------------- buttons */

.btn-primary, .btn-secondary, .btn-small {
    background: var(--ledger-600);
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13.5px;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 4px;
    transition: background 0.15s, transform 0.05s;
    font-family: inherit;
}
.btn-primary:hover, .btn-secondary:hover, .btn-small:hover { background: var(--ledger-700); }
.btn-primary:active, .btn-secondary:active, .btn-small:active { transform: translateY(1px); }

.btn-secondary { background: var(--ink-800); }
.btn-secondary:hover { background: var(--ink-900); }

.btn-small { padding: 5px 12px; font-size: 12px; margin-top: 0; font-weight: 500; }

/* ---------------------------------------------------------------- panels */

.panel {
    background: var(--surface);
    padding: 22px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--line);
    margin-bottom: 24px;
}

.hint { color: var(--muted); font-size: 12px; display: block; margin-top: 4px; }

.error-msg, .success-msg {
    display: flex;
    align-items: center;
    padding: 10px 14px;
    border-radius: 6px;
    font-size: 13px;
    margin-bottom: 16px;
    font-weight: 500;
}
.error-msg { color: var(--rust-600); background: var(--rust-100); }
.success-msg { color: var(--ledger-700); background: var(--ledger-100); }
.field-error { color: var(--rust-600); font-size: 11px; margin-top: 3px; }

/* ---------------------------------------------------------------- tables */

.grid-wrap {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--line);
}

.grid {
    width: 100%;
    border-collapse: collapse;
    background: var(--surface);
    min-width: 640px;
}

.grid th {
    background: var(--ink-900);
    color: #E7ECF1;
    text-align: left;
    padding: 11px 14px;
    font-size: 11.5px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    font-weight: 600;
    white-space: nowrap;
}

.grid td {
    padding: 11px 14px;
    border-bottom: 1px solid #EEF2ED;
    font-size: 13px;
    color: var(--ink-700);
}
.grid tbody tr:last-child td { border-bottom: none; }
.grid tbody tr:hover td { background: var(--paper-50); }
.grid tbody tr:nth-child(even) td { background: #FAFBF9; }
.grid tbody tr:nth-child(even):hover td { background: var(--paper-50); }

/* ---------------------------------------------------------------- badges (status pills) */

.badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    text-transform: capitalize;
    white-space: nowrap;
}
.badge-green  { background: var(--ledger-100); color: var(--ledger-700); }
.badge-amber  { background: var(--amber-100);  color: var(--amber-500); }
.badge-rust   { background: var(--rust-100);   color: var(--rust-600); }
.badge-slate  { background: #E7ECF1; color: var(--ink-800); }

/* ---------------------------------------------------------------- dashboard cards */

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.card {
    background: var(--surface);
    padding: 18px 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--line);
    border-left: 4px solid var(--ledger-600);
    position: relative;
    overflow: hidden;
}
.card::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: repeating-linear-gradient(
        to bottom, rgba(31,111,84,0.035) 0, rgba(31,111,84,0.035) 1px, transparent 1px, transparent 22px
    );
    pointer-events: none;
}

.card-icon {
    width: 30px; height: 30px;
    border-radius: 7px;
    background: var(--ledger-100);
    color: var(--ledger-700);
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 10px;
}
.card--amber { border-left-color: var(--amber-500); }
.card--amber .card-icon { background: var(--amber-100); color: var(--amber-500); }
.card--rust { border-left-color: var(--rust-600); }
.card--rust .card-icon { background: var(--rust-100); color: var(--rust-600); }
.card--ink { border-left-color: var(--ink-800); }
.card--ink .card-icon { background: #E7ECF1; color: var(--ink-800); }

.card-number { font-size: 26px; font-weight: 600; color: var(--ink-900); position: relative; }
.card-label { font-size: 12px; color: var(--muted); margin-top: 4px; position: relative; }

/* ---------------------------------------------------------------- responsive */

@media (max-width: 1080px) {
    .content { padding: 22px; }
}

@media (max-width: 860px) {
    .nav-toggle { display: inline-flex; }

    .sidenav {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        height: 100vh;
        transform: translateX(-100%);
        transition: transform 0.22s ease-in-out;
        box-shadow: var(--shadow-pop);
    }
    .sidenav.open { transform: translateX(0); }

    .user-name { display: none; }
    .role-badge { display: none; }

    .content { padding: 18px; }
    .panel { padding: 18px; }
}

@media (max-width: 560px) {
    .cards { grid-template-columns: 1fr; }
    .form-grid { grid-template-columns: 1fr; }
    .btn-primary, .btn-secondary { width: 100%; justify-content: center; }
    .topbar { padding: 10px 14px; }
    .login-box { padding: 28px 22px; }
    h1 { font-size: 18px; }
}

@media (prefers-reduced-motion: reduce) {
    .sidenav, .btn-primary, .btn-secondary, .btn-small { transition: none; }
}