:root {
    /* Core brand palette: warm dark brown, charcoal and off-white carry most of the UI;
       the rust/orange and sky-blue accents are used sparingly for actions and status. */
    --color-brown: #341500;
    --color-charcoal: #171717;
    --color-offwhite: #fefffa;
    --color-rust: #db4f1c;
    --color-orange: #fe6732;
    --color-skyblue: #5dc1ff;
    --color-paleblue: #abddfe;

    --color-bg: #f8f8f2;
    --color-surface: #fefffa;
    --color-border: #e2ded7;
    --color-border-strong: #d2ccc3;
    --color-text: #171717;
    --color-text-muted: #5c5d5b;

    --color-primary: #db4f1c;
    --color-primary-dark: #9e3914;
    --color-primary-tint: #faeadf;

    --color-danger: #db4f1c;
    --color-danger-dark: #ba4318;
    --color-danger-tint: #f9e5d9;
    --color-danger-border: #f2c1ac;

    --color-success: #2a5773;
    --color-success-tint: #def3fb;

    --sidebar-width: 220px;
    --topbar-height: 56px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--color-bg);
    color: var(--color-text);
}

h1 { font-size: 1.5rem; margin: 0 0 1rem; }
h2 { font-size: 1.15rem; margin: 0 0 0.75rem; }
h3 { font-size: 1rem; margin: 1.25rem 0 0.5rem; color: var(--color-text-muted); }

a { color: var(--color-primary); }

/* ---- App shell / sidebar layout ---- */

.nav-toggle-checkbox { display: none; }

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

.app-topbar {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--topbar-height);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    align-items: center;
    padding: 0 1rem;
    z-index: 20;
}

.app-topbar-title {
    font-weight: 600;
    margin-left: 0.75rem;
    color: var(--color-brown);
}

.nav-toggle-button {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    width: 28px;
    height: 28px;
    cursor: pointer;
}

.nav-toggle-button span {
    display: block;
    height: 2px;
    background: var(--color-text);
    border-radius: 1px;
}

.nav-scrim {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(23,23,23,0.45);
    z-index: 25;
}

.app-sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    background: var(--color-brown);
    color: #f1ece5;
}

.app-sidebar-inner {
    position: sticky;
    top: 0;
    display: flex;
    flex-direction: column;
    height: 100vh;
    padding: 1rem 0;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem 1.5rem;
}

.brand-centered { justify-content: center; padding: 0 0 1.5rem; }

.brand-logo {
    max-width: 150px;
    height: auto;
    display: block;
}

.brand-logo-large {
    max-width: 200px;
    height: auto;
    display: block;
}

.nav-links {
    list-style: none;
    margin: 0;
    padding: 0;
    flex: 1;
}

.nav-links li { margin: 0; }

.nav-links a {
    display: block;
    padding: 0.65rem 1.25rem;
    color: #cabfb2;
    text-decoration: none;
    border-left: 3px solid transparent;
}

.nav-links a:hover { background: rgba(254,255,250,0.08); color: var(--color-offwhite); }

.nav-links a.active {
    background: rgba(219,79,28,0.22);
    color: var(--color-offwhite);
    border-left-color: var(--color-rust);
    font-weight: 600;
}

.nav-footer { padding: 1rem 1.25rem 0; border-top: 1px solid rgba(254,255,250,0.14); }

.nav-logout {
    color: #cabfb2;
    text-decoration: none;
    font-size: 0.9rem;
}

.nav-logout:hover { color: var(--color-offwhite); }

.app-content {
    flex: 1;
    min-width: 0;
    padding: 1.5rem 2rem 3rem;
}

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

.panel {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 1.25rem 1.5rem;
    margin-bottom: 1.5rem;
}

.page-columns {
    display: grid;
    grid-template-columns: minmax(280px, 380px) 1fr;
    gap: 1.5rem;
    align-items: start;
}

.panel-wide { min-width: 0; }

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.stat-label { font-size: 0.8rem; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.03em; }
.stat-value { font-size: 1.8rem; font-weight: 700; color: var(--color-brown); }
.stat-sub { font-size: 0.85rem; color: var(--color-text-muted); }

.quick-links { display: flex; gap: 0.75rem; flex-wrap: wrap; }

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

label {
    display: block;
    margin-bottom: 0.85rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
}

.required { color: var(--color-danger); margin-left: 2px; }
.hint { font-weight: 400; color: var(--color-text-muted); font-size: 0.8rem; }

input[type="text"], input[type="password"], input[type="email"], input[type="number"],
input[type="date"], input:not([type]), textarea, select {
    display: block;
    width: 100%;
    margin-top: 0.3rem;
    padding: 0.5rem 0.65rem;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 0.95rem;
    background: var(--color-surface);
    color: var(--color-text);
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--color-rust);
    box-shadow: 0 0 0 3px rgba(219,79,28,0.15);
}

.checkbox-label { display: flex; align-items: center; gap: 0.5rem; }
.checkbox-label input { width: auto; margin: 0; }

.form-actions { display: flex; gap: 0.75rem; margin-top: 1rem; }

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.55rem 1rem;
    border-radius: 6px;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text);
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
}

.btn:hover { background: #f2f1eb; }

.btn-primary { background: var(--color-primary); color: var(--color-offwhite); border-color: var(--color-primary); }
.btn-primary:hover { background: var(--color-primary-dark); border-color: var(--color-primary-dark); }

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

.btn-small { padding: 0.3rem 0.6rem; font-size: 0.8rem; }
.btn-block { width: 100%; }

.row-actions { display: flex; gap: 0.4rem; flex-wrap: wrap; }

/* ---- Tables ---- */

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

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.data-table th {
    text-align: left;
    padding: 0.6rem 0.6rem;
    border-bottom: 2px solid var(--color-border-strong);
    color: var(--color-text-muted);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.data-table td {
    padding: 0.6rem 0.6rem;
    border-bottom: 1px solid var(--color-border);
    vertical-align: top;
}

.empty-state { color: var(--color-text-muted); font-style: italic; }

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

.badge {
    display: inline-block;
    padding: 0.15rem 0.55rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    background: #ecece8;
    color: #454544;
}

.badge-draft { background: #ecece8; color: #454544; }
.badge-sent { background: var(--color-success-tint); color: var(--color-success); }
.badge-paid { background: #eae8e1; color: #482c19; }
.badge-overdue { background: var(--color-danger-tint); color: var(--color-danger-dark); }
.badge-void { background: #ecece8; color: #454544; }
.badge-active { background: var(--color-success-tint); color: var(--color-success); }
.badge-onhold { background: #fee4d6; color: #8c391c; }
.badge-completed { background: #eae8e1; color: #482c19; }
.badge-archived { background: #ecece8; color: #454544; }

/* ---- Status messages ---- */

.status-message {
    padding: 0.6rem 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.status-ok { background: var(--color-success-tint); color: var(--color-success); }
.status-error { background: var(--color-danger-tint); color: var(--color-danger-dark); }

/* ---- Timer ---- */

.timer-running { display: flex; flex-direction: column; gap: 0.4rem; align-items: flex-start; }
.timer-elapsed { font-size: 2.2rem; font-weight: 700; font-variant-numeric: tabular-nums; color: var(--color-primary); }
.timer-detail { color: var(--color-text-muted); }
.timer-start-form, .manual-entry-form { display: flex; flex-direction: column; gap: 0; }

.manual-line-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr auto;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    align-items: center;
}

.export-links { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-bottom: 1.5rem; }

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

.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    background: var(--color-bg);
}

.login-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 2rem;
    width: 100%;
    max-width: 360px;
    box-shadow: 0 10px 30px rgba(52,21,0,0.08);
}

.login-error {
    background: var(--color-danger-tint);
    color: var(--color-danger-dark);
    padding: 0.6rem 0.8rem;
    border-radius: 6px;
    font-size: 0.85rem;
    margin-bottom: 1rem;
}

/* ---- Responsive: mobile ---- */

@media (max-width: 860px) {
    .app-topbar { display: flex; }

    .app-sidebar {
        position: fixed;
        top: 0; left: 0; bottom: 0;
        z-index: 30;
        transform: translateX(-100%);
        transition: transform 0.2s ease;
    }

    .nav-toggle-checkbox:checked ~ .app-shell .app-sidebar { transform: translateX(0); }
    .nav-toggle-checkbox:checked ~ .app-shell .nav-scrim { display: block; }

    .app-content { padding-top: calc(var(--topbar-height) + 1.25rem); }

    .page-columns { grid-template-columns: 1fr; }

    .data-table thead { display: none; }
    .data-table, .data-table tbody, .data-table tr, .data-table td { display: block; width: 100%; }
    .data-table tr { border: 1px solid var(--color-border); border-radius: 8px; margin-bottom: 0.75rem; padding: 0.5rem 0.75rem; }
    .data-table td { border: none; padding: 0.3rem 0; display: flex; justify-content: space-between; gap: 1rem; }
    .data-table td[data-label]::before { content: attr(data-label); font-weight: 600; color: var(--color-text-muted); margin-right: 1rem; }

    .manual-line-row { grid-template-columns: 1fr; }
}