/* ============================================================================
   bechstein.digital — Rechnungen
   Aesthetic: "Kontor" — paper & ink ledger, oxblood accent, mono numerals.
   ========================================================================== */

:root {
    --paper:        #f4f0e7;
    --paper-panel:  #faf7f0;
    --paper-sunk:   #ece6d8;
    --ink:          #211e19;
    --ink-soft:     #5d564b;
    --ink-faint:    #6e6554;   /* darkened to meet WCAG AA 4.5:1 on paper */
    --rule:         #ddd5c4;
    --rule-strong:  #c3b9a3;
    --accent:       #7c2e2e;
    --accent-deep:  #5e2121;
    --accent-tint:  #f0e3df;
    --ok:           #3f6b4f;
    --ok-tint:      #edf2ed;
    --danger:       #7c2e2e;
    --danger-tint:  #f6e7e4;

    --serif:  "Fraunces", Georgia, serif;
    --sans:   "Hanken Grotesk", system-ui, sans-serif;
    --mono:   "IBM Plex Mono", ui-monospace, monospace;

    --maxw:   1100px;
    --radius: 3px;
    --shadow: 0 1px 0 var(--rule-strong), 0 18px 40px -28px rgba(33, 30, 25, .5);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
    margin: 0;
    font-family: var(--sans);
    font-size: 16px;
    line-height: 1.55;
    color: var(--ink);
    background-color: var(--paper);
    background-image:
        repeating-linear-gradient(90deg, transparent 0 39px, rgba(124, 46, 46, .025) 39px 40px),
        radial-gradient(rgba(33, 30, 25, .018) 1px, transparent 1px);
    background-size: auto, 3px 3px;
    -webkit-font-smoothing: antialiased;
}

::selection { background: var(--accent); color: var(--paper); }

/* Visible keyboard focus for all interactive, non-input elements
   (inputs/selects carry their own focus treatment below). */
a:focus-visible,
button:focus-visible,
.btn:focus-visible,
.tile:focus-visible,
summary:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: var(--radius);
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

h1, h2, h3 { font-family: var(--serif); font-weight: 500; letter-spacing: -.01em; line-height: 1.1; margin: 0; }
h1 { font-size: clamp(2rem, 4vw, 3rem); font-optical-sizing: auto; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.15rem; }

.num, .amount, td.num { font-family: var(--mono); font-variant-numeric: tabular-nums; letter-spacing: -.02em; }

.overline {
    font-family: var(--mono);
    font-size: .7rem;
    letter-spacing: .22em;
    text-transform: uppercase;
    color: var(--accent);
}

/* ---- Header ------------------------------------------------------------- */

.masthead { border-top: 3px solid var(--accent); background: var(--paper-panel); }
.masthead__inner {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 18px 28px;
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 24px;
    border-bottom: 1px solid var(--rule-strong);
}
.brand { font-family: var(--serif); font-size: 1.4rem; font-weight: 600; color: var(--ink); white-space: nowrap; }
.brand span { color: var(--accent); }
.brand small { display: block; font-family: var(--mono); font-size: .62rem; letter-spacing: .26em; text-transform: uppercase; color: var(--ink-faint); font-weight: 400; margin-top: 2px; }

.nav { display: flex; gap: 4px; flex-wrap: wrap; }
.nav a {
    font-size: .82rem;
    letter-spacing: .02em;
    color: var(--ink-soft);
    padding: 10px 14px;
    border-radius: var(--radius);
    text-decoration: none;
    transition: background .15s, color .15s;
}
.nav a:hover { background: var(--paper-sunk); color: var(--ink); text-decoration: none; }
.nav a.is-active { color: var(--accent); background: var(--accent-tint); }

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

main { max-width: var(--maxw); margin: 0 auto; padding: 48px 28px 80px; }

.page-head { margin-bottom: 36px; }
.page-head h1 { margin: 6px 0 8px; }
.page-head p { color: var(--ink-soft); max-width: 56ch; margin: 0; }

.stack > * + * { margin-top: 20px; }
.grid { display: grid; gap: 22px; }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

/* ---- Panels & tiles ----------------------------------------------------- */

.panel {
    background: var(--paper-panel);
    border: 1px solid var(--rule-strong);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.panel__head { padding: 18px 24px; border-bottom: 1px solid var(--rule); display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.panel__head h2 { font-size: 1.25rem; }
.panel__body { padding: 24px; }

.tile {
    display: block;
    background: var(--paper-panel);
    border: 1px solid var(--rule-strong);
    border-radius: var(--radius);
    padding: 22px 22px 26px;
    color: inherit;
    text-decoration: none;
    position: relative;
    overflow: hidden;
    transition: transform .18s ease, box-shadow .18s ease, border-color .18s;
}
.tile::after { content: "→"; position: absolute; right: 20px; bottom: 16px; font-family: var(--mono); color: var(--accent); opacity: 0; transform: translateX(-6px); transition: opacity .18s, transform .18s; }
.tile:hover { transform: translateY(-3px); border-color: var(--accent); box-shadow: 0 22px 44px -30px rgba(33,30,25,.55); text-decoration: none; }
.tile:hover::after { opacity: 1; transform: translateX(0); }
.tile h3 { margin: 10px 0 6px; }
.tile p { color: var(--ink-soft); font-size: .9rem; margin: 0; }
.tile .figure { font-family: var(--mono); font-size: 2.4rem; line-height: 1; color: var(--ink); }

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

.form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px 24px; }
.fieldset { border: 0; padding: 0; margin: 0 0 8px; }
.fieldset legend { font-family: var(--mono); font-size: .7rem; letter-spacing: .2em; text-transform: uppercase; color: var(--accent); padding: 0 0 8px; margin-bottom: 14px; width: 100%; border-bottom: 1px solid var(--rule); }

.field { display: flex; flex-direction: column; gap: 6px; }
.field.col-span { grid-column: 1 / -1; }
.field label { font-size: .78rem; font-weight: 600; letter-spacing: .02em; color: var(--ink-soft); }
.field label.required::after { content: " *"; color: var(--accent); font-weight: 400; }
.field input, .field select, .field textarea {
    font-family: var(--sans);
    font-size: .95rem;
    color: var(--ink);
    background: var(--paper);
    border: 1px solid var(--rule-strong);
    border-radius: var(--radius);
    padding: 10px 12px;
    transition: border-color .15s, box-shadow .15s, background .15s;
}
.field input:focus, .field select:focus, .field textarea:focus {
    outline: none;
    border-color: var(--accent);
    background: var(--paper-panel);
    box-shadow: 0 0 0 3px var(--accent-tint);
}
.field .help { font-size: .72rem; color: var(--ink-faint); }
.field--mono input { font-family: var(--mono); letter-spacing: .01em; }

.form-actions { display: flex; gap: 12px; align-items: center; margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--rule); }

/* Grouped action clusters (invoice detail) — keeps one clear primary
   and labels the secondary sets instead of a flat wall of buttons. */
.action-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 20px; }
.action-group { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.action-group > .overline { margin-right: 2px; color: var(--ink-faint); }
.action-bar .spacer { margin-left: auto; }
@media (max-width: 640px) { .action-bar .spacer { margin-left: 0; width: 100%; } }

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

.btn {
    display: inline-block;
    font-family: var(--sans);
    font-size: .88rem;
    font-weight: 600;
    letter-spacing: .01em;
    padding: 11px 20px;
    border-radius: var(--radius);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: transform .12s, background .15s, color .15s, border-color .15s;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--accent); color: var(--paper); border-color: var(--accent-deep); }
.btn--primary:hover { background: var(--accent-deep); text-decoration: none; }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--rule-strong); }
.btn--ghost:hover { border-color: var(--ink); text-decoration: none; }

/* ---- Flash -------------------------------------------------------------- */

.flash {
    border: 1px solid var(--ok);
    border-left-width: 3px;
    background: var(--ok-tint);
    color: var(--ok);
    padding: 12px 18px;
    border-radius: var(--radius);
    font-size: .9rem;
    margin-bottom: 24px;
}
.flash--error { border-color: var(--danger); background: var(--danger-tint); color: var(--danger); }

/* Form-level (global) validation summary */
.form-error-summary { border: 1px solid var(--danger); border-left-width: 3px; background: var(--danger-tint); color: var(--danger); padding: 12px 18px; border-radius: var(--radius); font-size: .9rem; margin-bottom: 20px; }
.form-error-summary ul { margin: 6px 0 0; padding-left: 18px; }

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

.foot { max-width: var(--maxw); margin: 0 auto; padding: 28px; border-top: 1px solid var(--rule); color: var(--ink-faint); font-family: var(--mono); font-size: .7rem; letter-spacing: .12em; text-transform: uppercase; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

/* ---- Ledger table ------------------------------------------------------- */

table.ledger { width: 100%; border-collapse: collapse; }
table.ledger th { text-align: left; font-family: var(--mono); font-size: .64rem; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-faint); font-weight: 500; padding: 15px 24px; border-bottom: 1px solid var(--rule-strong); }
table.ledger th.num, table.ledger td.num { text-align: right; }
table.ledger td { padding: 15px 24px; border-bottom: 1px solid var(--rule); }
table.ledger tbody tr:last-child td { border-bottom: 0; }
table.ledger tbody tr:hover { background: var(--paper); }

.badge { font-family: var(--mono); font-size: .64rem; letter-spacing: .08em; text-transform: uppercase; padding: 3px 9px; border-radius: 2px; border: 1px solid; }
.badge--draft { color: var(--ink-soft); border-color: var(--rule-strong); background: var(--paper); }
.badge--issued { color: var(--ok); border-color: var(--ok); background: #edf2ed; }
.badge--open { color: var(--accent); border-color: var(--accent); background: var(--accent-tint); }
.badge--accepted { color: var(--ok); border-color: var(--ok); background: #edf2ed; }
.badge--rejected, .badge--expired { color: var(--danger); border-color: var(--danger); background: var(--danger-tint); }
.badge--cancelled { color: var(--danger); border-color: var(--danger); background: var(--danger-tint); text-decoration: line-through; }
.badge--pay-open { color: var(--ink-soft); border-color: var(--rule-strong); background: var(--paper); }
.badge--pay-partially_paid { color: var(--accent); border-color: var(--accent); background: var(--accent-tint); }
.badge--pay-overdue { color: var(--danger); border-color: var(--danger); background: var(--danger-tint); }
.badge--pay-paid { color: var(--ok); border-color: var(--ok); background: #edf2ed; }
.badge--ref { color: var(--ink-faint); border-color: var(--rule-strong); background: var(--paper); text-decoration: none; }
.badge--ref:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }

/* ---- Line items --------------------------------------------------------- */

.line-head, .line-row { display: grid; grid-template-columns: minmax(0,1fr) 72px 104px 108px 78px 100px 36px; gap: 10px; align-items: center; }
.line-head { font-family: var(--mono); font-size: .62rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-faint); padding-bottom: 9px; border-bottom: 1px solid var(--rule); margin-bottom: 8px; }
.line-row { padding: 7px 0; }
.line-row + .line-row { border-top: 1px solid var(--rule); }
.line-row .field { gap: 0; }
.line-row input, .line-row select, .line-row textarea { padding: 8px 9px; font-size: .88rem; }
.line-add { grid-column: 1 / -1; margin-top: 4px; }
.line-add textarea { width: 100%; resize: vertical; color: var(--ink-soft); }
.line-remove { border: 1px solid var(--rule-strong); background: var(--paper); color: var(--accent); border-radius: var(--radius); width: 36px; height: 36px; cursor: pointer; font-size: 1.1rem; line-height: 1; transition: border-color .15s, background .15s; }
.line-remove:hover { border-color: var(--accent); background: var(--accent-tint); }
.lines--recurring .line-head, .lines--recurring .line-row { grid-template-columns: minmax(0,1fr) 72px 104px 108px 78px 36px; }

@media (max-width: 760px) {
    .line-head { display: none; }
    .line-row { grid-template-columns: 1fr 1fr; gap: 8px; padding: 14px 0; }
    .line-row .field:first-child { grid-column: 1 / -1; }
    .line-remove { grid-column: 1 / -1; width: 100%; height: 44px; }
}

.field--muted { opacity: .45; }
.field--muted input { background: var(--paper-sunk); }

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

.login { max-width: 26rem; margin: 6vh auto 0; }
.login .actions { margin-top: 4px; }
.login .check { display: flex; align-items: center; gap: 8px; font-size: .82rem; color: var(--ink-soft); }
.login .check input { width: auto; }
.login .btn { width: 100%; justify-content: center; }

.nav__account {
    margin-left: auto;
    font-family: var(--mono);
    font-size: .72rem;
    letter-spacing: .04em;
    color: var(--ink-faint);
}
.nav__account:hover { color: var(--accent); }
.nav__logout { font-size: .8rem; color: var(--ink-faint); }
.nav__logout:hover { color: var(--accent); }

/* ---- Entrance ----------------------------------------------------------- */

@media (prefers-reduced-motion: no-preference) {
    .reveal { opacity: 0; transform: translateY(10px); animation: rise .6s cubic-bezier(.2,.7,.3,1) forwards; }
    .reveal:nth-child(2) { animation-delay: .06s; }
    .reveal:nth-child(3) { animation-delay: .12s; }
    .reveal:nth-child(4) { animation-delay: .18s; }
    @keyframes rise { to { opacity: 1; transform: none; } }
}

@media (max-width: 640px) {
    .form-grid { grid-template-columns: 1fr; }
    .masthead__inner { flex-direction: column; align-items: flex-start; gap: 14px; }
}