/* General Body and Theming */
:root {
    --accent-color: #009E60; /* Default Green */
    --bg-color: #ECEDE8;
    --text-color: #273338;
    --border-color: #009E60;
    --sidebar-bg: #1d2125;
    --sidebar-text: #ECEDE8;
}
body {
    font-family: 'TH SarabunPSK', sans-serif;
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    height: 100vh;
}
h1, h2, h3 {
    color: var(--text-color);
}

/* --- Layout and Sidebar --- */
.sidebar {
    width: 220px;
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    padding: 20px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    height: 100vh;
    box-sizing: border-box;
}
.main-content {
    flex-grow: 1;
    padding: 25px;
    overflow-y: auto;
}
.sidebar-header {
    text-align: center;
    padding-bottom: 10px;
    border-bottom: 1px solid #495057;
    margin-bottom: 20px;
}
.sidebar-logo {
    width: 90px;
    height: 90px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 10px;
}
.sidebar-header h2 {
    color: var(--accent-color);
    margin: 0;
    font-size: 24px;
}

/* --- Navigation --- */
.sidebar-nav {
    flex-grow: 1;
    overflow-y: auto;
}
.sidebar nav a, .sidebar .has-submenu {
    display: block;
    color: var(--sidebar-text);
    padding: 12px 15px;
    text-decoration: none;
    border-radius: 5px;
    margin-bottom: 5px;
    transition: background-color 0.2s ease-in-out;
}
.sidebar nav a:hover, .has-submenu:hover {
    background-color: #343a40;
}
.sidebar nav a.active {
    background-color: var(--accent-color);
    font-weight: bold;
}
.has-submenu {
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.has-submenu.active-parent {
    background-color: #2c3136;
    font-weight: bold;
}
.submenu {
    padding-left: 15px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}
.submenu a {
    font-size: 0.9em;
    padding: 8px 15px;
    border-left: 2px solid #495057;
}
.submenu a.active {
    background-color: var(--accent-color);
    border-left-color: var(--accent-color);
    font-weight: bold;
}
.sidebar-footer {
    padding-top: 15px;
    border-top: 1px solid #495057;
    flex-shrink: 0;
}
.sidebar-footer a {
    font-size: 1.1em;
    display: block;
    color: var(--sidebar-text);
    padding: 12px 15px;
    text-decoration: none;
    border-radius: 5px;
}
.sidebar-footer a:hover {
    background-color: #dc3545;
}


/* --- General Components --- */
.card {
    background-color: rgba(0,0,0,0.05);
    padding: 20px;
    border-radius: 8px;
    border-left: 5px solid var(--accent-color);
    display: flex;
    flex-direction: column;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}
th, td {
    border: 1px solid var(--border-color);
    padding: 6px 8px;
    vertical-align: middle;
}
thead {
    background-color: rgba(0,0,0,0.1);
}
.btn {
    padding: 5px 10px;
    font-size: 14px;
    text-decoration: none;
    color: white;
    border-radius: 5px;
    background-color: var(--accent-color);
    border: none;
    cursor: pointer;
}
.btn-danger { background-color: #dc3545; }
.btn-secondary { background-color: #6c757d; }
.btn-info { background-color: #17a2b8; }
.flash-message {
    padding: 15px;
    margin-bottom: 15px;
    border-radius: 5px;
    color: white;
}
.flash-message.success { background-color: #28a745; }
.flash-message.error { background-color: #dc3545; }


/* --- Forms --- */
form {
    background-color: transparent;
}
form label {
    font-weight: bold;
    display: block;
    margin-top: 4px;
}
form input, form select, form textarea {
    width: 100%;
    padding: 8px;
    margin-top: 4px;
    margin-bottom: 12px; /* Increased space to fix overlap */
    border: 1px solid var(--border-color);
    border-radius: 4px;
    box-sizing: border-box;
    background-color: var(--bg-color);
    color: var(--text-color);
}
form button {
    background-color: var(--accent-color);
    color: white;
    cursor: pointer;
    padding: 12px 20px;
    border: none;
    border-radius: 5px;
    margin-top: 20px;
    font-size: 16px;
}
.form-row {
    display: flex;
    flex-direction: row;
    gap: 20px;
    align-items: flex-end;
}
.form-group {
    flex: 1;
}

/* =================================== */
/* --- PAGE SPECIFIC STYLES --- */
/* =================================== */

/* --- List Pages (Students, Teachers) --- */
.list-page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}
.top-actions {
    display: flex;
    gap: 10px;
}
.action-btn-container-large {
    display: flex;
    gap: 0;
}
.action-btn-container-large .btn:first-child {
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}
.action-btn-container-large .btn:last-child {
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}
.truncate-text {
    max-width: 150px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.pagination {
    margin-top: 25px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 5px;
}
.page-link {
    display: inline-block;
    padding: 8px 12px;
    text-decoration: none;
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
    border-radius: 5px;
    transition: background-color 0.2s, color 0.2s;
}
.page-link:hover {
    background-color: var(--accent-color);
    color: white;
}
.page-link.active {
    background-color: var(--accent-color);
    color: white;
    font-weight: bold;
}
.page-link.disabled {
    color: #aaa;
    border-color: #ccc;
    pointer-events: none;
}
.actions-column {
  width: 120px;
  text-align: center;
}
.actions-column form {
    display: inline-block;
}


/* --- Dashboard pages --- */
.card-row {
    display: flex;
    gap: 20px;
}
.card-row .card {
    flex: 1;
}
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

/* --- Calendar Page --- */
.calendar-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 5px; }
.calendar-day { border: 1px solid var(--border-color); min-height: 120px; padding: 8px; font-size: 0.9em; cursor: pointer; transition: background-color 0.2s; }
.calendar-day:hover { background-color: rgba(0,0,0,0.05); }
.calendar-day.other-month { background-color: rgba(0,0,0,0.1); color: #888; cursor: default; }
.day-number { font-weight: bold; font-size: 1.2em; }
.calendar-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.working-teacher {
    color: var(--text-color);
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
}
.day-note { font-style: italic; opacity: 0.7; }

/* --- Daily Schedule Page --- */
.schedule-container { display: grid; grid-template-columns: 1fr 1fr; gap: 25px; }
.teacher-table { width: 100%; border-collapse: collapse; }
.teacher-table td { border: none; padding: 6px 0; vertical-align: middle; }
.teacher-table .checkbox-col { width: 50px; display: flex; align-items: center; justify-content: center; }
.teacher-table .checkbox-col input[type="checkbox"] { transform: scale(1.4); }
.teacher-table .name-col { text-align: left; }

/* --- Daily Overview Page --- */
.overview-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; margin-bottom: 25px; }
.stat-card { background-color: rgba(0,0,0,0.05); padding: 15px; border-radius: 8px; text-align: center; }
.stat-card .value { font-size: 2em; font-weight: bold; color: var(--accent-color); }
.stat-card .label { font-size: 1em; }
.overview-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 25px; }
.absent-list { list-style-type: '❌'; padding-left: 20px; }
.teacher-hours-table { width: 100%; border-collapse: collapse; }
.teacher-hours-table td { border: none; border-bottom: 1px solid rgba(0,0,0,0.1); padding: 15px 5px; vertical-align: middle; }
.teacher-hours-table tr:last-child td { border-bottom: none; }
.teacher-hours-table .teacher-name-cell { font-weight: bold; }
.teacher-hours-table .time-input-cell { width: 110px; }
.teacher-hours-table .time-input-cell input { width: 100%; padding: 5px; margin: 0; }
.teacher-hours-table .button-cell { width: 90px; text-align: right; }
.teacher-hours-table .button-cell button { margin: 0; padding: 5px 10px; font-size: 12px; }