/* === DESIGN SYSTEM === */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700&display=swap');

:root {
    --bg: #f5f6f8;
    --surface: #fff;
    --sh: #f0f1f3;
    --el: #f0f1f3;
    --bd: #e2e4e8;
    --tx: #1d1d1f;
    --tm: #6e7380;
    --td: #aeaeb6;
    --hd: #1d1d1f;
    --sw: rgba(0,0,0,.06);

    --ac: #635bff;
    --ac-hover: #5346e0;
    --ac-light: rgba(99,91,255,.08);

    --green: #22c55e;
    --green-bg: rgba(34,197,94,.1);
    --orange: #f59e0b;
    --orange-bg: rgba(245,158,11,.1);
    --red: #dc2626;
    --red-bg: rgba(220,38,38,.1);
    --blue: #2563eb;
    --blue-bg: rgba(37,99,235,.1);

    --radius-sm: 6px;
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-pill: 9999px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--tx);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* === TYPOGRAPHY === */
h1 { font-size: 24px; font-weight: 700; color: var(--hd); }
h2 { font-size: 18px; font-weight: 600; color: var(--hd); }
h3 { font-size: 13px; font-weight: 600; color: var(--tm); text-transform: uppercase; letter-spacing: 0.5px; }

/* === CARD / SURFACE === */
.card {
    background: var(--surface);
    border-radius: var(--radius-xl);
    box-shadow: 0 1px 3px var(--sw), 0 4px 24px var(--sw);
}

/* === BUTTONS === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background .2s, transform .1s, box-shadow .2s;
    text-decoration: none;
}
.btn:active { transform: scale(.97); }
.btn:focus-visible { outline: 2px solid var(--ac); outline-offset: 2px; }
.btn:disabled { background: var(--el) !important; color: var(--td) !important; cursor: not-allowed; transform: none; }

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

.btn-secondary { background: var(--el); color: var(--tx); }
.btn-secondary:hover { background: var(--bd); }

.btn-success { background: var(--green); color: #fff; }
.btn-success:hover { background: #16a34a; }

.btn-danger { background: var(--red-bg); color: var(--red); border: 1px solid transparent; }
.btn-danger:hover { background: var(--red); color: #fff; }

.btn-sm { padding: 6px 12px; font-size: 12px; border-radius: var(--radius-sm); }
.btn-block { width: 100%; }
.btn-lg { padding: 14px 28px; font-size: 16px; }

/* === BADGES === */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: var(--radius-pill);
    font-size: 12px;
    font-weight: 600;
}
.badge-green { background: var(--green-bg); color: var(--green); }
.badge-orange { background: var(--orange-bg); color: var(--orange); }
.badge-red { background: var(--red-bg); color: var(--red); }
.badge-blue { background: var(--blue-bg); color: var(--blue); }
.badge-gray { background: var(--el); color: var(--tm); }
.badge-purple { background: var(--ac-light); color: var(--ac); }

/* === FORM INPUTS === */
.input {
    width: 100%;
    padding: 10px 12px;
    background: var(--surface);
    border: 1px solid var(--bd);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 14px;
    color: var(--tx);
    outline: none;
    transition: border-color .15s, box-shadow .15s;
}
.input:focus {
    border-color: var(--ac);
    box-shadow: 0 0 0 3px var(--ac-light);
}
.input::placeholder { color: var(--td); }

select.input {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236e7380' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 32px;
}

label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--tx);
    margin-bottom: 6px;
}
label.required::after { content: ' *'; color: var(--red); }

.hint { font-size: 12px; color: var(--tm); margin-top: -8px; margin-bottom: 16px; }

/* === TABLE === */
.table {
    width: 100%;
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: 0 1px 3px var(--sw);
    border-collapse: collapse;
    overflow: hidden;
}
.table th {
    text-align: left;
    padding: 14px 20px;
    background: var(--sh);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--tm);
    font-weight: 600;
}
.table td {
    padding: 14px 20px;
    border-top: 1px solid var(--el);
    font-size: 14px;
}
.table tr { transition: background .12s; }
.table tbody tr:hover { background: var(--sh); }

/* === NAVBAR === */
.main-nav {
    background: linear-gradient(135deg, #2d3a4f 0%, #1e293b 100%);
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    box-shadow: 0 1px 3px rgba(0,0,0,.1), 0 4px 12px rgba(0,0,0,.05);
    position: sticky;
    top: 0;
    z-index: 50;
}
.nav-left {
    display: flex;
    align-items: center;
    gap: 32px;
}
.nav-brand {
    text-decoration: none;
    display: flex;
    align-items: baseline;
    gap: 6px;
}
.nav-brand-name {
    font-size: 20px;
    font-weight: 700;
    color: #fff;
}
.nav-brand-tag {
    font-size: 13px;
    font-weight: 500;
    color: rgba(255,255,255,.4);
}
.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}
.nav-link {
    color: rgba(255,255,255,.6);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 8px 14px;
    border-radius: var(--radius);
    transition: background .15s, color .15s;
}
.nav-link:hover {
    background: rgba(255,255,255,.08);
    color: #fff;
}
.nav-right {
    display: flex;
    align-items: center;
    gap: 16px;
}
.nav-user {
    display: flex;
    align-items: center;
    gap: 10px;
}
.nav-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--ac);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 700;
}
.nav-username {
    color: rgba(255,255,255,.8);
    font-size: 14px;
    font-weight: 500;
}
.nav-logout {
    font-size: 13px !important;
    color: rgba(255,255,255,.35) !important;
}
.nav-logout:hover {
    color: rgba(255,255,255,.7) !important;
    background: rgba(255,255,255,.05) !important;
}

@media (max-width: 640px) {
    .main-nav { padding: 0 16px; height: 56px; }
    .nav-links { display: none; }
    .nav-brand-tag { display: none; }
    .nav-username { display: none; }
}

/* === HEADER === */
.header-bar {
    background: var(--hd);
    color: #fff;
    padding: 16px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.header-bar h1 { color: #fff; font-size: 18px; }
.header-bar .user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    color: rgba(255,255,255,.7);
}
.header-bar code {
    font-size: 11px;
    color: rgba(255,255,255,.5);
}

/* === STATUS BARS === */
.status-bar {
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 600;
}
.status-bar.draft { background: var(--orange-bg); color: #b45309; }
.status-bar.approved { background: var(--green-bg); color: #15803d; }
.status-bar.paid { background: var(--blue-bg); color: var(--blue); }

/* === INFO GRID === */
.info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}
.info-box {
    background: var(--sh);
    padding: 14px;
    border-radius: var(--radius);
}
.info-box .label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--tm);
    margin-bottom: 2px;
}
.info-box .value {
    font-size: 15px;
    font-weight: 600;
    color: var(--hd);
}

/* === PARTNER ROW === */
.partner-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--sh);
    border-radius: var(--radius);
    margin-bottom: 6px;
    transition: background .12s;
}
.partner-row:hover { background: var(--el); }
.partner-row .name {
    flex: 1;
    font-weight: 500;
    font-size: 14px;
}
.partner-row .name code {
    font-size: 11px;
    color: var(--td);
}
.partner-row .pct-input {
    width: 75px;
    min-width: 75px;
    padding: 7px;
    text-align: center;
    font-weight: 600;
    color: var(--ac);
    border: 2px solid var(--bd);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 14px;
    outline: none;
    transition: border-color .15s;
}
.partner-row .pct-input:focus { border-color: var(--ac); }
.partner-row .pct-suffix { font-size: 14px; color: var(--tm); }

/* === RESULT MESSAGES === */
.result {
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
}
.result.success { background: var(--green-bg); color: #15803d; }
.result.error { background: var(--red-bg); color: var(--red); }

/* === LINKS === */
a.back-link {
    color: var(--ac);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color .15s;
}
a.back-link:hover { color: var(--ac-hover); }

a.view-link {
    color: var(--ac);
    text-decoration: none;
    font-weight: 500;
}
a.view-link:hover { text-decoration: underline; }

/* === PAYMENT LINK BOX === */
.payment-link-box {
    padding: 16px;
    background: var(--ac-light);
    border-radius: var(--radius);
    border: 2px solid var(--ac);
}
.payment-link-box label {
    font-size: 12px;
    text-transform: uppercase;
    color: var(--ac);
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

/* === COLLAPSIBLE === */
.collapsible {
    background: var(--sh);
    border-radius: var(--radius);
    margin: 16px 0;
    overflow: hidden;
}
.collapsible-header {
    padding: 14px 16px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    font-weight: 600;
    color: var(--tm);
    user-select: none;
    transition: color .15s;
}
.collapsible-header:hover { color: var(--tx); }
.collapsible-header .arrow { transition: transform .2s; }
.collapsible-header.open .arrow { transform: rotate(180deg); }
.collapsible-body { display: none; padding: 0 16px 16px; }
.collapsible-body.open { display: block; }

/* === MODAL === */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.5);
    backdrop-filter: blur(4px);
    z-index: 100;
    justify-content: center;
    align-items: center;
}
.modal {
    background: var(--surface);
    border-radius: var(--radius-xl);
    padding: 32px;
    width: 500px;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0,0,0,.15);
}

/* === UTILITIES === */
.text-muted { color: var(--tm); }
.text-sm { font-size: 13px; }
.text-xs { font-size: 11px; }
.font-semibold { font-weight: 600; }
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }
.mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.gap-4 { gap: 16px; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.row { display: flex; gap: 12px; }
.row > * { flex: 1; }

/* === INVOICE CARDS === */
.invoice-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.invoice-card {
    display: block;
    text-decoration: none;
    color: var(--tx);
    padding: 20px 24px;
    transition: transform .15s, box-shadow .15s;
    cursor: pointer;
}
.invoice-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0,0,0,.08);
}
.invoice-card-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 14px;
}
.invoice-card-ref {
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.invoice-number {
    font-size: 13px;
    font-weight: 600;
    color: var(--ac);
}
.invoice-client {
    font-size: 17px;
    font-weight: 600;
    color: var(--tx);
}
.invoice-card-amount {
    text-align: right;
    display: flex;
    align-items: baseline;
    gap: 4px;
}
.amount-value {
    font-size: 22px;
    font-weight: 700;
    color: var(--tx);
}
.amount-currency {
    font-size: 13px;
    font-weight: 600;
    color: var(--tm);
}
.invoice-card-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.invoice-card-meta {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}
.invoice-card-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* === CONTRACT BODY (markdown rendered) === */
.contract-body { font-size: 14px; line-height: 1.7; color: var(--tx); }
.contract-body h1 { font-size: 20px; font-weight: 700; margin: 24px 0 8px; }
.contract-body h2 { font-size: 17px; font-weight: 600; margin: 20px 0 8px; }
.contract-body h3 { font-size: 14px; font-weight: 600; margin: 16px 0 6px; text-transform: none; letter-spacing: 0; }
.contract-body p { margin-bottom: 10px; }
.contract-body ul, .contract-body ol { margin: 8px 0 8px 24px; }
.contract-body li { margin-bottom: 4px; }
.contract-body hr { border: none; border-top: 1px solid var(--bd); margin: 20px 0; }
.contract-body table { width: 100%; border-collapse: collapse; margin: 12px 0; }
.contract-body th, .contract-body td { text-align: left; padding: 8px 12px; border: 1px solid var(--bd); font-size: 13px; }
.contract-body th { background: var(--sh); font-weight: 600; }
.contract-body strong { font-weight: 600; }
.contract-body blockquote { border-left: 3px solid var(--ac); padding-left: 16px; color: var(--tm); margin: 12px 0; }

/* === MOBILE MENU === */
.nav-hamburger {
    display: none;
    background: none;
    border: none;
    color: rgba(255,255,255,.7);
    cursor: pointer;
    padding: 4px;
    border-radius: 6px;
}
.nav-hamburger:hover { color: #fff; background: rgba(255,255,255,.1); }

.nav-mobile-menu {
    display: none;
    background: #1e293b;
    border-top: 1px solid rgba(255,255,255,.08);
    position: sticky;
    top: 60px;
    z-index: 49;
}
.nav-mobile-menu.open { display: flex; flex-direction: column; }
.nav-mobile-link {
    padding: 14px 20px;
    color: rgba(255,255,255,.8);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    border-bottom: 1px solid rgba(255,255,255,.06);
    transition: background .15s, color .15s;
}
.nav-mobile-link:hover { background: rgba(255,255,255,.06); color: #fff; }

/* === RESPONSIVE === */
@media (max-width: 640px) {
    body { font-size: 14px; }
    h1 { font-size: 20px; }
    h2 { font-size: 16px; }

    .info-grid { grid-template-columns: 1fr; }
    .row { flex-direction: column; gap: 8px; }
    .header-bar { padding: 12px 16px; }
    .card { border-radius: var(--radius-lg); padding: 20px !important; }

    /* Navbar mobile */
    .main-nav { padding: 0 12px; height: 52px; gap: 8px; }
    .nav-left { gap: 12px; }
    .nav-links { display: none; }
    .nav-brand-tag { display: none; }
    .nav-username { display: none; }
    .nav-logout { display: none; }
    .nav-right { gap: 8px; }
    .nav-hamburger { display: flex; }

    /* Invoice cards */
    .invoice-card { padding: 14px 16px; }
    .invoice-card-top { flex-direction: column; gap: 8px; }
    .invoice-card-amount { text-align: left; }
    .amount-value { font-size: 18px; }
    .invoice-card-bottom { flex-direction: column; align-items: flex-start; gap: 8px; }
    .invoice-card-actions { width: 100%; justify-content: space-between; }

    /* Buttons */
    .btn-lg { padding: 12px 20px; font-size: 15px; }
    .btn-sm { padding: 5px 10px; font-size: 11px; }

    /* Modal */
    .modal { width: calc(100vw - 32px); padding: 24px; max-height: 90vh; }

    /* Payment link box */
    .payment-link-box .flex { flex-direction: column; }
    .payment-link-box .input { font-size: 12px; }

    /* Split panel */
    .split-parties { gap: 12px; }
    .split-party { min-width: 70px; }

    /* Status sidebar hidden on mobile, show inline */
    .split-status {
        min-width: unset;
        border-left: none;
        padding-left: 0;
        border-top: 1px solid var(--bd);
        padding-top: 12px;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 6px;
    }

    /* KPI stats */
    div[style*="grid-template-columns:repeat(3"] {
        grid-template-columns: 1fr !important;
    }
}