:root {
    --color-bg: #f5f6f8;
    --color-fg: #222;
    --color-primary: #2563eb;
    --color-border: #d7dce2;
    --color-error: #b91c1c;
    --color-error-bg: #fdecec;
    --color-success: #166534;
    --color-success-bg: #eafaf0;
}

* { box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--color-bg);
    color: var(--color-fg);
    margin: 0;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 1.5rem;
}

.nav {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    padding: 0.75rem 1.5rem;
}

.nav-brand { font-weight: 700; display: flex; align-items: center; gap: 0.6rem; }
.nav-logo { height: 28px; width: auto; display: block; }
.nav-links { display: flex; gap: 1rem; flex: 1; flex-wrap: wrap; }
.nav-links a, .nav-user a { color: var(--color-primary); text-decoration: none; }
.nav-links a:hover, .nav-user a:hover { text-decoration: underline; }
.nav-user { margin-left: auto; font-size: 0.9rem; }

h1 { font-size: 1.4rem; }
h2 { font-size: 1.15rem; }

table { width: 100%; border-collapse: collapse; margin: 1rem 0; background: #fff; }
th, td { padding: 0.5rem 0.6rem; border-bottom: 1px solid var(--color-border); text-align: left; }
th { background: #eef1f5; }

form.inline { display: inline; }

.card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 1rem;
    margin-bottom: 1rem;
}

label { display: block; font-size: 0.9rem; margin-bottom: 0.25rem; }
input[type=text], input[type=password], input[type=date], input[type=time], input[type=number], select {
    padding: 0.4rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 1rem;
}

.btn {
    display: inline-block;
    background: var(--color-primary);
    color: #fff;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.95rem;
}
.btn:hover { opacity: 0.9; }
.btn-danger { background: var(--color-error); }
.btn-secondary { background: #6b7280; }

.flash { padding: 0.6rem 1rem; border-radius: 4px; margin-bottom: 1rem; }
.flash-error { background: var(--color-error-bg); color: var(--color-error); }
.flash-success { background: var(--color-success-bg); color: var(--color-success); }

.accordion-item { border: 1px solid var(--color-border); border-radius: 6px; margin-bottom: 0.75rem; background: #fff; }
.accordion-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    cursor: pointer;
    font-weight: 600;
}
.accordion-toggle {
    font-size: 1.1rem;
    width: 1.5rem;
    text-align: center;
}
.accordion-body { display: none; padding: 0 1rem 1rem; }
.accordion-item.open .accordion-body { display: block; }

.subproject-row { display: flex; gap: 0.75rem; align-items: flex-end; padding: 0.6rem 0; border-top: 1px solid var(--color-border); flex-wrap: wrap; }
.subproject-row label { margin-bottom: 0; }

.remaining-banner { padding: 0.6rem 1rem; border-radius: 4px; margin-bottom: 1rem; background: #eef1f5; font-weight: 600; }
.remaining-banner.over { background: var(--color-error-bg); color: var(--color-error); }

.closed-tag { color: #6b7280; font-weight: normal; font-size: 0.85rem; }