:root {
    --bg: #0f172a;
    --bg-elevated: #1e293b;
    --bg-card: #162032;
    --border: #334155;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --accent: #38bdf8;
    --accent-hover: #0ea5e9;
    --danger: #f87171;
    --danger-hover: #ef4444;
    --success: #4ade80;
    --error: #f87171;
    --radius: 10px;
    --shadow: 0 10px 30px rgba(0,0,0,0.35);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 24px 16px 64px;
}

.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.app-header h1 {
    margin: 0;
    font-size: 1.6rem;
    font-weight: 700;
}

.lock-form {
    margin: 0;
}

.pin-box,
.form-card,
.table-wrap {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
    margin-bottom: 24px;
}

.pin-box {
    text-align: center;
    max-width: 360px;
    margin: 60px auto;
}

.pin-lead {
    color: var(--text-muted);
    margin: 0 0 16px;
}

.pin-input {
    width: 100%;
    padding: 14px;
    font-size: 1.2rem;
    text-align: center;
    letter-spacing: 0.3em;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    margin-bottom: 12px;
}

.pin-input:focus {
    outline: none;
    border-color: var(--accent);
}

.form-card h2 {
    margin: 0 0 18px;
    font-size: 1.15rem;
    font-weight: 600;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 16px;
    margin-bottom: 18px;
}

.form-grid label {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.form-grid input {
    padding: 10px 12px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 1rem;
}

.form-grid input:focus {
    outline: none;
    border-color: var(--accent);
}

.form-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: 8px;
    padding: 10px 18px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s, transform 0.05s;
    text-decoration: none;
}

.btn:active {
    transform: translateY(1px);
}

.btn-primary {
    background: var(--accent);
    color: #0f172a;
}

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-secondary {
    background: var(--bg-elevated);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: #27354f;
}

.btn-danger {
    background: rgba(248, 113, 113, 0.12);
    color: var(--danger);
    border: 1px solid rgba(248, 113, 113, 0.3);
}

.btn-danger:hover {
    background: rgba(248, 113, 113, 0.22);
}

.btn-small {
    padding: 6px 12px;
    font-size: 0.82rem;
}

.inline-form {
    display: inline;
    margin: 0;
}

.flash {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 18px;
    font-weight: 500;
}

.flash-success {
    background: rgba(74, 222, 128, 0.12);
    color: var(--success);
    border: 1px solid rgba(74, 222, 128, 0.25);
}

.flash-error {
    background: rgba(248, 113, 113, 0.12);
    color: var(--error);
    border: 1px solid rgba(248, 113, 113, 0.25);
}

.table-wrap {
    overflow-x: auto;
    padding: 0;
}

.hours-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 680px;
}

.hours-table th,
.hours-table td {
    padding: 12px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.hours-table th {
    background: var(--bg-elevated);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    position: sticky;
    top: 0;
    z-index: 2;
}

.hours-table .num {
    text-align: right;
    font-variant-numeric: tabular-nums;
}

.hours-table .actions {
    text-align: right;
    white-space: nowrap;
}

.data-row:hover {
    background: rgba(255,255,255,0.03);
}

.year-header td {
    background: var(--bg-elevated);
    font-weight: 700;
    color: var(--accent);
    padding-top: 18px;
    padding-bottom: 10px;
}

.year-total td,
.grand-total td {
    background: rgba(255,255,255,0.04);
}

.year-total td {
    border-top: 2px solid var(--border);
}

.grand-total td {
    border-top: 3px solid var(--accent);
    font-size: 1.05rem;
    color: var(--text);
}

.empty {
    text-align: center;
    color: var(--text-muted);
    padding: 40px;
}

.hidden {
    display: none !important;
}

@media (max-width: 640px) {
    .app-header h1 {
        font-size: 1.25rem;
    }

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

    .hours-table th,
    .hours-table td {
        padding: 10px 8px;
        font-size: 0.9rem;
    }

    .btn-small {
        padding: 5px 8px;
        font-size: 0.75rem;
    }
}