/* OSGridManager — Main Stylesheet
   Minimal, no frameworks. Flexbox/grid layout only.
   ================================================================ */

/* ---------------------------------------------------------------
   CSS Custom Properties
   --------------------------------------------------------------- */
:root {
    --color-bg:         #f5f5f5;
    --color-surface:    #ffffff;
    --color-border:     #ddd;
    --color-text:       #222;
    --color-muted:      #666;
    --color-primary:    #2563eb;
    --color-primary-dk: #1d4ed8;
    --color-danger:     #dc2626;
    --color-success:    #16a34a;
    --color-warning:    #d97706;
    --color-info:       #0284c7;

    --font-sans:  system-ui, -apple-system, sans-serif;
    --font-mono:  ui-monospace, 'Cascadia Code', monospace;

    --radius:     4px;
    --shadow:     0 1px 3px rgba(0,0,0,.12);
    --container:  960px;
}

/* ---------------------------------------------------------------
   Reset
   --------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; }
body { font-family: var(--font-sans); background: var(--color-bg); color: var(--color-text); line-height: 1.6; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }

/* ---------------------------------------------------------------
   Layout
   --------------------------------------------------------------- */
.container { max-width: var(--container); margin: 0 auto; padding: 0 1rem; }

/* ---------------------------------------------------------------
   Header
   --------------------------------------------------------------- */
.site-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow);
    padding: .75rem 0;
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: .5rem; }
.site-logo { font-size: 1.25rem; font-weight: 700; color: var(--color-primary); }
.site-nav ul { list-style: none; display: flex; gap: 1rem; flex-wrap: wrap; align-items: center; }
.site-nav a { color: var(--color-text); font-size: .9rem; }
.site-nav a:hover { color: var(--color-primary); }

/* ---------------------------------------------------------------
   Main
   --------------------------------------------------------------- */
.site-main { padding: 2rem 0; }

/* ---------------------------------------------------------------
   Footer
   --------------------------------------------------------------- */
.site-footer { border-top: 1px solid var(--color-border); padding: 1.5rem 0; text-align: center; color: var(--color-muted); font-size: .85rem; }

/* ---------------------------------------------------------------
   Alerts / Flash messages
   --------------------------------------------------------------- */
.alert { padding: .75rem 1rem; border-radius: var(--radius); margin-bottom: 1.25rem; font-size: .9rem; }
.alert-success { background: #dcfce7; border: 1px solid #86efac; color: #15803d; }
.alert-error   { background: #fee2e2; border: 1px solid #fca5a5; color: #b91c1c; }
.alert-warning { background: #fef9c3; border: 1px solid #fde68a; color: #92400e; }
.alert-info    { background: #dbeafe; border: 1px solid #93c5fd; color: #1d4ed8; }

/* ---------------------------------------------------------------
   Forms
   --------------------------------------------------------------- */
.form-group { margin-bottom: 1.25rem; }
.form-group label { display: block; font-size: .9rem; font-weight: 600; margin-bottom: .35rem; }
.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: .5rem .75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: var(--font-sans);
    background: var(--color-surface);
    color: var(--color-text);
    transition: border-color .15s;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(37,99,235,.15); }
.form-hint { font-size: .8rem; color: var(--color-muted); margin-top: .25rem; }
.form-error { font-size: .8rem; color: var(--color-danger); margin-top: .25rem; }

/* ---------------------------------------------------------------
   Buttons
   --------------------------------------------------------------- */
.btn { display: inline-block; padding: .5rem 1.25rem; border-radius: var(--radius); font-size: .9rem; font-weight: 600; cursor: pointer; border: none; text-align: center; transition: background .15s; }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-dk); color: #fff; text-decoration: none; }
.btn-danger  { background: var(--color-danger); color: #fff; }
.btn-link    { background: none; border: none; color: var(--color-primary); cursor: pointer; font-size: .9rem; padding: 0; font-family: inherit; }
.btn-link:hover { text-decoration: underline; }
.inline-form { display: inline; }

/* ---------------------------------------------------------------
   Cards
   --------------------------------------------------------------- */
.card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 1.5rem; box-shadow: var(--shadow); }
.card-title { font-size: 1.15rem; font-weight: 700; margin-bottom: 1rem; }

/* ---------------------------------------------------------------
   Tables
   --------------------------------------------------------------- */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .9rem; }
th, td { text-align: left; padding: .6rem .75rem; border-bottom: 1px solid var(--color-border); }
th { background: #f9fafb; font-weight: 600; }
tr:hover td { background: #f5f5f5; }

/* ---------------------------------------------------------------
   Badges
   --------------------------------------------------------------- */
.badge { display: inline-block; padding: .15rem .5rem; border-radius: 99px; font-size: .75rem; font-weight: 600; }
.badge-green  { background: #dcfce7; color: #15803d; }
.badge-red    { background: #fee2e2; color: #b91c1c; }
.badge-blue   { background: #dbeafe; color: #1d4ed8; }
.badge-grey   { background: #f3f4f6; color: #6b7280; }

/* ---------------------------------------------------------------
   Utility
   --------------------------------------------------------------- */
.mt-1 { margin-top: .5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-2 { margin-bottom: 1rem; }
.text-muted  { color: var(--color-muted); }
.text-sm     { font-size: .85rem; }
.text-center { text-align: center; }
.mono        { font-family: var(--font-mono); font-size: .85rem; }

/* ---------------------------------------------------------------
   Responsive
   --------------------------------------------------------------- */
@media (max-width: 600px) {
    .site-header .container { flex-direction: column; align-items: flex-start; }
    .site-nav ul { gap: .5rem; }
}