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

:root {
    --green-900: #14532d;
    --green-800: #166534;
    --green-700: #15803d;
    --green-600: #16a34a;
    --green-100: #dcfce7;
    --green-50: #f0fdf4;
    --slate-900: #0f172a;
    --slate-700: #334155;
    --slate-500: #64748b;
    --slate-300: #cbd5e1;
    --slate-100: #f1f5f9;
    --white: #ffffff;
    --red-600: #dc2626;
    --red-50: #fef2f2;
    --amber-600: #d97706;
    --amber-50: #fffbeb;
    --blue-600: #2563eb;
    --blue-50: #eff6ff;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--green-50);
    color: var(--slate-900);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* ── Layout ─────────────────────────────────────────────────────────────── */
.screen { display: none; min-height: 100vh; flex-direction: column; }
.screen.active { display: flex; }

.app-header {
    background: var(--green-800);
    color: var(--white);
    padding: 16px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    position: sticky;
    top: 0;
    z-index: 10;
}
.app-header h1 { font-size: 18px; font-weight: 700; flex: 1; }
.app-header .logo { font-size: 22px; }

.back-btn, .signout-btn {
    background: none;
    border: none;
    color: rgba(255,255,255,0.8);
    cursor: pointer;
    padding: 4px;
    font-size: 20px;
    line-height: 1;
    border-radius: 6px;
    transition: color 0.15s;
}
.back-btn:hover, .signout-btn:hover { color: var(--white); }

.screen-body { flex: 1; padding: 20px; max-width: 480px; width: 100%; margin: 0 auto; }

/* ── Login ───────────────────────────────────────────────────────────────── */
#screen-login { background: var(--green-800); align-items: center; justify-content: center; }
.login-box {
    background: var(--white);
    border-radius: 16px;
    padding: 36px 28px;
    width: 100%;
    max-width: 380px;
    margin: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.25);
}
.login-logo {
    text-align: center;
    margin-bottom: 24px;
}
.login-logo .icon { font-size: 48px; }
.login-logo h2 { font-size: 24px; font-weight: 800; color: var(--green-800); margin-top: 8px; }
.login-logo p { color: var(--slate-500); font-size: 14px; margin-top: 4px; }

/* ── Forms ───────────────────────────────────────────────────────────────── */
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; font-weight: 600; color: var(--slate-700); margin-bottom: 6px; }
.field input {
    width: 100%;
    padding: 11px 14px;
    border: 1.5px solid var(--slate-300);
    border-radius: 8px;
    font-size: 15px;
    transition: border-color 0.15s;
    background: var(--white);
}
.field input:focus { outline: none; border-color: var(--green-600); }

.btn {
    display: block;
    width: 100%;
    padding: 13px;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.15s, background 0.15s;
}
.btn:disabled { opacity: 0.55; cursor: not-allowed; }
.btn-primary { background: var(--green-700); color: var(--white); }
.btn-primary:hover:not(:disabled) { background: var(--green-800); }
.btn-secondary { background: var(--slate-100); color: var(--slate-700); }
.btn-secondary:hover:not(:disabled) { background: var(--slate-300); }
.btn-pay { background: var(--green-600); color: var(--white); font-size: 14px; padding: 9px 16px; width: auto; }
.btn-pay:hover:not(:disabled) { background: var(--green-700); }
.btn-danger { background: var(--red-600); color: var(--white); }
.btn-danger:hover:not(:disabled) { background: #b91c1c; }

.checkout-link { text-align: center; margin-top: 14px; }
.checkout-link a { font-size: 13px; color: var(--slate-500); text-decoration: none; }
.checkout-link a:hover { color: var(--red-600); }
.checkout-pending { text-align: center; margin-top: 14px; font-size: 13px; color: var(--amber-600); font-weight: 600; }

.error-msg {
    background: var(--red-50);
    color: var(--red-600);
    border: 1px solid #fecaca;
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 14px;
    margin-bottom: 16px;
    display: none;
}
.error-msg.visible { display: block; }

.success-banner {
    background: var(--green-100);
    color: var(--green-800);
    border: 1px solid #86efac;
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 14px;
    margin-bottom: 16px;
    display: none;
}
.success-banner.visible { display: block; }

/* ── Cards ───────────────────────────────────────────────────────────────── */
.card {
    background: var(--white);
    border-radius: 12px;
    padding: 18px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    margin-bottom: 16px;
}
.card-title {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--slate-500);
    margin-bottom: 12px;
}
.unit-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}
.unit-number { font-size: 22px; font-weight: 800; color: var(--slate-900); }
.unit-site { font-size: 14px; color: var(--slate-500); margin-bottom: 12px; }

.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.detail-item label { display: block; font-size: 11px; color: var(--slate-500); font-weight: 600; text-transform: uppercase; margin-bottom: 2px; }
.detail-item span { font-size: 14px; font-weight: 600; color: var(--slate-700); }

.credential-row {
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid var(--slate-100);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.credential-label { font-size: 12px; color: var(--slate-500); font-weight: 600; }
.credential-value { font-size: 20px; font-weight: 800; letter-spacing: 0.12em; color: var(--green-800); font-family: 'Courier New', monospace; }

/* ── Badges ──────────────────────────────────────────────────────────────── */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.badge-active { background: var(--green-100); color: var(--green-800); }
.badge-overdue { background: var(--red-50); color: var(--red-600); }
.badge-pending { background: var(--amber-50); color: var(--amber-600); }
.badge-paid { background: var(--green-100); color: var(--green-800); }
.badge-due { background: var(--amber-50); color: var(--amber-600); }
.badge-part-paid { background: var(--blue-50); color: var(--blue-600); }
.badge-granted { background: var(--green-100); color: var(--green-800); }
.badge-suspended { background: var(--red-50); color: var(--red-600); }

/* ── Invoice list ────────────────────────────────────────────────────────── */
.invoice-item {
    background: var(--white);
    border-radius: 10px;
    padding: 14px 16px;
    margin-bottom: 10px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.07);
}
.invoice-row { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.invoice-number { font-size: 13px; font-weight: 700; color: var(--slate-700); }
.invoice-period { font-size: 12px; color: var(--slate-500); margin-top: 3px; }
.invoice-amount { font-size: 16px; font-weight: 700; color: var(--slate-900); }

/* ── Payment modal ───────────────────────────────────────────────────────── */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 100;
    align-items: flex-end;
    justify-content: center;
}
.modal-overlay.open { display: flex; }
.modal-sheet {
    background: var(--white);
    border-radius: 20px 20px 0 0;
    padding: 24px 20px 32px;
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    overflow-y: auto;
}
.modal-handle {
    width: 40px;
    height: 4px;
    background: var(--slate-300);
    border-radius: 2px;
    margin: 0 auto 20px;
}
.modal-title { font-size: 18px; font-weight: 800; margin-bottom: 4px; }
.modal-subtitle { font-size: 13px; color: var(--slate-500); margin-bottom: 20px; }
#payment-element { margin-bottom: 20px; min-height: 120px; }
.modal-actions { display: flex; flex-direction: column; gap: 10px; }

/* ── Empty/loading states ────────────────────────────────────────────────── */
.empty-state { text-align: center; padding: 40px 20px; color: var(--slate-500); }
.empty-state .icon { font-size: 40px; margin-bottom: 12px; }
.spinner {
    width: 36px; height: 36px;
    border: 3px solid var(--slate-300);
    border-top-color: var(--green-600);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    margin: 40px auto;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── No-rental card ─────────────────────────────────────────────────────── */
.no-rental { text-align: center; padding: 32px 20px; color: var(--slate-500); }
.no-rental .icon { font-size: 36px; }
.no-rental p { margin-top: 10px; font-size: 15px; }