/* ============================================================
   COURSE MANAGEMENT PLATFORM — BASE STYLESHEET
   Source: Snapshot Decoder PySide6 app (ui_pyside6/)
   ============================================================ */

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

body {
    font-family: 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: #333333;
    background-color: #ffffff;
    margin: 0; padding: 0;
}

/* --- Typography --- */
h1 { color: #0078d4; border-bottom: 2px solid #AFC8E8; padding-bottom: 10px; margin-top: 0; }
h2 { color: #333333; font-weight: bold; margin-top: 20px; }
h3 { color: #555555; margin-top: 15px; }
p  { margin: 10px 0; }
ul, ol { margin: 10px 0 10px 20px; }
li { margin: 5px 0; }
a  { color: #0078d4; }
a:hover { color: #106ebe; }
code { background-color: #F8F8F8; border: 1px solid #C0C0C0; padding: 2px 6px;
       border-radius: 3px; font-family: Consolas, monospace; font-weight: bold; }

/* --- Standard Button --- */
.btn {
    background-color: #F0F0F0; color: #333333;
    border: 1px solid #C0C0C0; border-radius: 3px;
    padding: 6px 16px; font-family: inherit; font-weight: bold;
    font-size: 14px; cursor: pointer; transition: all 0.15s; display: inline-block;
}
.btn:hover  { background-color: #E0E0E0; border-color: #0078d4; }
.btn:active { background-color: #D0D0D0; }

/* --- Primary Button --- */
.btn-primary {
    background-color: #0078d4; color: white;
    border: 1px solid #0078d4; border-radius: 3px;
    padding: 6px 20px; font-family: inherit; font-weight: bold;
    font-size: 14px; cursor: pointer; transition: all 0.15s; display: inline-block;
}
.btn-primary:hover  { background-color: #106ebe; }
.btn-primary:active { background-color: #005fa3; }

/* --- Toggle Button --- */
.btn-toggle {
    background-color: #F0F0F0; color: #333333;
    border: 1px solid #C0C0C0; border-radius: 3px;
    padding: 6px 16px; font-weight: bold; cursor: pointer; transition: all 0.15s;
}
.btn-toggle:hover      { background-color: #E0E0E0; border-color: #0078d4; }
.btn-toggle.active     { background-color: #0078d4; color: white; border-color: #0078d4; }
.btn-toggle.active:hover { background-color: #106ebe; }

/* --- Destructive Button --- */
.btn-danger {
    background-color: #ffe6e6; color: #cc0000;
    border: 1px solid #ffcccc; border-radius: 4px;
    padding: 6px 16px; font-weight: bold; cursor: pointer; transition: all 0.15s;
}
.btn-danger:hover  { background-color: #ffcccc; border-color: #ff9999; }
.btn-danger:active { background-color: #ffb3b3; }

/* --- Large Card Button --- */
.btn-card {
    background: linear-gradient(to bottom, #ffffff, #F8F8F8);
    color: #0078d4; border: 2px solid #AFC8E8; border-radius: 8px;
    padding: 24px 20px; min-width: 160px; min-height: 100px;
    cursor: pointer; font-size: 16px; font-weight: bold; text-align: center;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    gap: 8px; transition: all 0.15s; font-family: inherit;
}
.btn-card:hover {
    border-color: #0078d4;
    background: linear-gradient(to bottom, #EAF4FF, #D8E9FF);
    box-shadow: 0 2px 8px rgba(0,120,212,0.15);
}
.btn-card .icon  { font-size: 28px; }
.btn-card .label { font-size: 14px; color: #333333; }

/* --- Cards --- */
.card {
    background-color: #ffffff; border: 1px solid #C0C0C0;
    border-radius: 6px; padding: 16px 20px; margin: 10px 0;
    box-shadow: 0 1px 2px rgba(0,0,0,0.06);
}
.card-accent {
    background-color: #ffffff; border: 1px solid #C0C0C0;
    border-left: 4px solid #0078d4; border-radius: 6px;
    padding: 16px 20px; margin: 10px 0;
    box-shadow: 0 1px 2px rgba(0,0,0,0.06);
}
.card-title {
    color: #0078d4; font-size: 15px; font-weight: 700;
    margin-bottom: 10px; padding-bottom: 8px; border-bottom: 1px solid #E0E0E0;
}
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 16px; padding: 16px 0;
}

/* --- Panel with gradient title --- */
.panel { border: 1px solid #C0C0C0; border-radius: 6px; overflow: hidden; margin: 8px 0; }
.panel-title {
    background: linear-gradient(to bottom, #EAF4FF, #D8E9FF);
    border-bottom: 1px solid #AFC8E8;
    padding: 6px 12px; font-weight: bold; font-size: 13px; color: #333333;
    display: flex; align-items: center; justify-content: space-between;
}
.panel-body { background-color: #F8F8F8; padding: 12px; }

/* --- Callout Boxes --- */
.info    { background-color: #EAF4FF; padding: 14px; border-left: 4px solid #0078d4; margin: 12px 0; border-radius: 0 4px 4px 0; }
.tip     { background-color: #f0fff4; padding: 14px; border-left: 4px solid #2E7D32; margin: 12px 0; border-radius: 0 4px 4px 0; }
.note    { background-color: #fffbeb; padding: 14px; border-left: 4px solid #F9A825; margin: 12px 0; border-radius: 0 4px 4px 0; }
.warning { background-color: #fff5f5; padding: 14px; border-left: 4px solid #E53935; margin: 12px 0; border-radius: 0 4px 4px 0; }
.step    { background-color: #F8F8F8; padding: 14px; border-left: 4px solid #AFC8E8; margin: 12px 0; border-radius: 0 4px 4px 0; }

/* --- Tables --- */
table  { border-collapse: collapse; width: 100%; margin: 14px 0; }
th, td { border: 1px solid #C0C0C0; padding: 9px 12px; text-align: left; }
th     { background: linear-gradient(to bottom, #EAF4FF, #D8E9FF);
         border-bottom: 2px solid #AFC8E8; color: #333333; font-weight: bold; }
tr:nth-child(even) { background-color: #F8F8F8; }
tr:hover { background-color: #EAF4FF; }

/* --- TOC Layout --- */
.toc-layout  { display: flex; min-height: 100vh; }
.toc-sidebar {
    width: 220px; min-width: 220px; background: #F8F8F8;
    border-right: 1px solid #C0C0C0; padding: 16px 12px;
    box-sizing: border-box; position: sticky; top: 0;
    height: 100vh; overflow-y: auto;
}
.toc-home {
    display: block; font-weight: bold; font-size: 14px; color: #0078d4;
    text-decoration: none; padding: 6px 8px; border-radius: 3px; margin-bottom: 10px;
    background: linear-gradient(to bottom, #EAF4FF, #D8E9FF);
    border: 1px solid #AFC8E8;
}
.toc-home:hover { background: #D8E9FF; }
.toc-heading {
    font-size: 11px; font-weight: bold; text-transform: uppercase;
    letter-spacing: 0.05em; color: #888888; margin: 14px 0 4px 8px;
}
.toc-list { list-style: none; margin: 0; padding: 0; }
.toc-list li { margin: 0; }
.toc-link {
    display: block; padding: 4px 8px; color: #555555;
    text-decoration: none; font-size: 13px; border-radius: 3px; line-height: 1.4;
}
.toc-link:hover, .toc-link.active {
    background-color: #EAF4FF; color: #0078d4; font-weight: 600;
    border-left: 3px solid #0078d4; padding-left: 5px;
}
.toc-content { flex: 1; min-width: 0; padding: 24px 32px 40px 32px; max-width: 900px; }

/* --- Form inputs --- */
input[type="text"], input[type="search"], textarea, select {
    width: 100%; padding: 6px 10px;
    border: 1px solid #C0C0C0; border-radius: 3px;
    font-family: inherit; font-size: 14px;
    background-color: white; transition: border-color 0.15s;
}
input[type="text"]:focus, textarea:focus, select:focus {
    outline: none; border-color: #0078d4;
    box-shadow: 0 0 0 3px rgba(0,120,212,0.12);
}

/* --- Checkbox --- */
input[type="checkbox"] { accent-color: #28a745; }