:root {
    --bg: #09090b;
    --surface: #141418;
    --surface-2: #1c1c23;
    --surface-hover: #26262e;
    --border: rgba(255, 255, 255, 0.08);
    --text: #f8f8f8;
    --text-dim: #8e8e9a;
    --accent: #10b981;
    --accent-hover: #059669;
    --danger: #ef4444;
    --warning: #f59e0b;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --safe-top: env(safe-area-inset-top, 0px);
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }
html, body {
    height: 100%; width: 100%;
    background-color: var(--bg); color: var(--text);
    font-family: var(--font); font-size: 16px; line-height: 1.4;
    overscroll-behavior-y: none;
}
input, select, button { font-family: inherit; font-size: 16px !important; color: var(--text); }

.screen { display: none; height: 100%; flex-direction: column; }
.screen.active { display: flex; }

/* LUKITUS */
#lock-screen {
align-items: center; justify-content: center;
padding: calc(var(--safe-top) + 24px) 24px calc(var(--safe-bottom) + 24px);
background: radial-gradient(circle at top, #111116 0%, var(--bg) 100%);
}
.lock-inner { width: 100%; max-width: 380px; text-align: center; }
.brand { font-size: 2.6rem; font-weight: 800; letter-spacing: 6px; }
.brand-sub { font-size: 0.75rem; letter-spacing: 4px; color: var(--text-dim); margin-bottom: 40px; }
input[type="password"], input[type="text"], input[type="number"], select {
    width: 100%; padding: 16px; background-color: var(--surface-2);
    border: 1px solid var(--border); border-radius: var(--radius-md);
    outline: none; transition: border-color 0.2s, box-shadow 0.2s;
}
input:focus, select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15); }
#unlock-form input { margin-bottom: 16px; }

/* NAPIT */
.btn {
    width: 100%; padding: 16px; font-weight: 600; border-radius: var(--radius-md);
    border: 1px solid var(--border); background-color: var(--surface-2);
    cursor: pointer; transition: all 0.15s ease; display: flex; justify-content: center; align-items: center; gap: 8px;
}
.btn:active { transform: scale(0.97); background-color: var(--surface-hover); }
.btn.primary { background-color: var(--accent); border-color: var(--accent); color: #000; }
.btn.primary:active { background-color: var(--accent-hover); }
.btn.danger { background-color: rgba(239, 68, 68, 0.1); border-color: rgba(239, 68, 68, 0.2); color: var(--danger); }
.btn.danger:active { background-color: rgba(239, 68, 68, 0.2); }
.btn.ghost { background-color: transparent; border-color: transparent; color: var(--text-dim); }
.btn.ghost:active { background-color: var(--surface-2); }

.error { color: var(--danger); margin-top: 14px; font-size: 0.9rem; }
.hint { color: var(--text-dim); font-size: 0.8rem; margin-top: 20px; line-height: 1.6; }

/* YLÄPALKKI */
.topbar {
    display: flex; align-items: center; justify-content: space-between;
    padding: calc(var(--safe-top) + 16px) 20px 16px;
    background-color: rgba(9, 9, 11, 0.8); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 10;
}
.topbar-brand { font-weight: 800; letter-spacing: 3px; font-size: 1.1rem; }
.icon-btn {
    background-color: var(--surface-2); border: 1px solid var(--border);
    border-radius: 12px; width: 40px; height: 40px;
    display: grid; place-items: center; cursor: pointer; transition: background 0.2s;
}
.icon-btn:active { background-color: var(--surface-hover); }

.view { flex: 1; overflow-y: auto; padding: 20px; padding-bottom: calc(100px + var(--safe-bottom)); -webkit-overflow-scrolling: touch; }

/* ALAPALKKI */
.tabbar {
    position: fixed; bottom: 0; left: 0; right: 0; display: flex;
    background-color: rgba(20, 20, 24, 0.85); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--border); padding-bottom: var(--safe-bottom); z-index: 20;
}
.tab {
    flex: 1; background: none; border: none; padding: 10px 0 12px;
    color: var(--text-dim); font-size: 0.7rem; font-weight: 500;
    display: flex; flex-direction: column; align-items: center; gap: 4px; cursor: pointer; transition: color 0.2s;
}
.tab svg { transition: transform 0.2s, stroke 0.2s; }
.tab.active { color: var(--accent); }
.tab.active svg { transform: translateY(-2px); }

/* KORTIT & TILASTOT */
.section-title { font-size: 0.75rem; letter-spacing: 1.5px; text-transform: uppercase; color: var(--text-dim); margin: 24px 4px 12px; font-weight: 600; }
.section-title:first-child { margin-top: 0; }

.card {
    background-color: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 18px; margin-bottom: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}
.card-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.card-title { font-weight: 600; font-size: 1rem; }
.card-sub { color: var(--text-dim); font-size: 0.85rem; margin-top: 4px; }
.card-value { font-weight: 700; font-variant-numeric: tabular-nums; font-size: 1.05rem; }

.stat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.stat {
    background: linear-gradient(145deg, var(--surface) 0%, var(--surface-2) 100%);
    border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 18px;
}
.stat-label { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 1px; color: var(--text-dim); font-weight: 600; }
.stat-value { font-size: 1.4rem; font-weight: 800; margin-top: 6px; font-variant-numeric: tabular-nums; }
.stat-value.accent { color: var(--accent); }
.stat-value.danger { color: var(--danger); }

.empty { text-align: center; color: var(--text-dim); padding: 50px 20px; font-size: 0.9rem; }

.pill { display: inline-block; font-size: 0.7rem; font-weight: 700; padding: 4px 10px; border-radius: 999px; letter-spacing: 0.5px; text-transform: uppercase; }
.pill.paid { background-color: rgba(16,185,129,0.15); color: var(--accent); }
.pill.unpaid { background-color: rgba(239,68,68,0.15); color: var(--danger); }
.pill.partial { background-color: rgba(245,158,11,0.15); color: var(--warning); }

.fab {
    position: fixed; right: 20px; bottom: calc(var(--safe-bottom) + 90px);
    width: 60px; height: 60px; border-radius: 20px;
    background-color: var(--accent); color: #000;
    border: none; box-shadow: 0 8px 24px rgba(16,185,129,0.3);
    cursor: pointer; z-index: 15; display: flex; align-items: center; justify-content: center;
    transition: transform 0.15s;
}
.fab:active { transform: scale(0.92); }

/* MODAALI */
.modal-backdrop {
    position: fixed; inset: 0; background-color: rgba(0,0,0,0.6);
    backdrop-filter: blur(4px); display: flex; align-items: flex-end; justify-content: center; z-index: 100;
}
.modal {
    background-color: var(--surface); width: 100%; max-width: 520px;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    padding: 24px 20px calc(var(--safe-bottom) + 24px);
    max-height: 90vh; overflow-y: auto; animation: slide-up 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    border-top: 1px solid var(--border);
}
.modal::before { content: ''; display: block; width: 40px; height: 4px; background: var(--surface-hover); border-radius: 2px; margin: -12px auto 20px; }
@keyframes slide-up { from { transform: translateY(100%); } to { transform: translateY(0); } }
.modal h2 { font-size: 1.3rem; margin-bottom: 20px; font-weight: 700; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 0.8rem; color: var(--text-dim); margin-bottom: 8px; font-weight: 500; }
.field-row { display: flex; gap: 12px; }
.field-row > * { flex: 1; }
.modal-actions { display: flex; gap: 10px; margin-top: 24px; }
.modal-actions .btn { flex: 1; }

.seg { display: flex; background-color: var(--surface-2); border-radius: var(--radius-md); padding: 4px; margin-bottom: 16px; }
.seg button { flex: 1; background: none; border: none; color: var(--text-dim); padding: 10px; border-radius: var(--radius-sm); font-size: 0.9rem; cursor: pointer; transition: all 0.2s; font-weight: 600; }
.seg button.active { background-color: var(--surface); color: var(--text); box-shadow: 0 2px 8px rgba(0,0,0,0.2); }

/* TOAST */
.toast-container { position: fixed; bottom: calc(var(--safe-bottom) + 90px); left: 50%; transform: translateX(-50%); z-index: 200; display: flex; flex-direction: column; gap: 10px; width: 90%; max-width: 400px; pointer-events: none; }
.toast {
    background-color: var(--surface-2); color: var(--text); padding: 14px 20px; border-radius: var(--radius-md);
    border: 1px solid var(--border); box-shadow: 0 8px 30px rgba(0,0,0,0.4); text-align: center; font-size: 0.95rem; font-weight: 500;
    animation: toast-in 0.3s cubic-bezier(0.16, 1, 0.3, 1); pointer-events: auto;
}
.toast.error { border-color: rgba(239, 68, 68, 0.3); color: var(--danger); }
@keyframes toast-in { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

/* ASETUKSET LISTA */
.settings-list { background-color: var(--surface); border-radius: var(--radius-lg); border: 1px solid var(--border); overflow: hidden; margin-bottom: 20px; }
.settings-item { display: flex; justify-content: space-between; align-items: center; padding: 16px 20px; border-bottom: 1px solid var(--border); }
.settings-item:last-child { border-bottom: none; }
.settings-item-title { font-weight: 500; }