:root {
    --primary-color: #4338ca;
    --primary-hover: #312e81;
    --secondary-color: #4b5563;
    --secondary-hover: #374151;
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --text-color: #1f2937;
    --text-muted: #4b5563;
    --border-color: #e5e7eb;
    --live-highlight-bg: #d1fae5;
    --live-highlight-border: #10b981;
    --live-highlight-text: #065f46;
}

* { 
    box-sizing: border-box; 
    margin: 0; 
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.4;
    font-size: 13px;
}

.container { 
    width: 100%; 
    max-width: 1000px; 
    margin: 0 auto; 
    padding: 0.5rem; 
}

/* Responsive Navigation Bar */
nav { 
    background: #ffffff; 
    box-shadow: 0 1px 3px rgba(0,0,0,0.1); 
    padding: 0.5rem 0.75rem; 
    width: 100%; 
    position: sticky;
    top: 0;
    z-index: 1000;
}
.nav-container { 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    max-width: 1000px; 
    margin: 0 auto; 
}
.logo { 
    font-weight: bold; 
    color: var(--primary-color); 
    font-size: 0.95rem; 
    max-width: 250px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.menu-toggle { 
    display: none; 
    background: none; 
    border: none; 
    font-size: 1.25rem; 
    cursor: pointer; 
    color: var(--text-color); 
    padding: 0.2rem; 
}
.nav-links { 
    display: flex; 
    gap: 0.2rem; 
}
nav .nav-links button {
    background: none; 
    border: none; 
    padding: 0.4rem 0.6rem; 
    cursor: pointer;
    font-weight: 500; 
    font-size: 0.8rem; 
    color: var(--text-muted); 
    border-radius: 4px;
}
nav .nav-links button:hover { 
    color: var(--primary-color); 
    background: #f3f4f6; 
}
#logout-btn { color: #ef4444 !important; }

/* Dashboard Headers */
.dashboard-header { margin-bottom: 0.5rem; }
.dashboard-header h2 { font-size: 1.1rem; font-weight: 700; color: #111827; }

/* Dashboard View Selectors */
.dashboard-tabs-bar {
    display: flex; 
    gap: 0.2rem; 
    margin-bottom: 0.5rem;
    background: #e5e7eb; 
    padding: 0.2rem; 
    border-radius: 6px;
}
.dash-tab-btn {
    flex: 1; padding: 0.4rem 0.2rem; border: none; background: none;
    font-weight: 600; font-size: 0.8rem; color: var(--text-muted);
    cursor: pointer; border-radius: 4px; text-align: center;
}
.dash-tab-btn.active {
    background: #ffffff; color: var(--primary-color);
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}
.dash-subpanel { display: none; }
.dash-subpanel.active { display: block; }

/* Header Info Strings */
.live-meta-row { 
    display: flex; justify-content: space-between; align-items: center; 
    margin-bottom: 0.4rem; gap: 0.4rem;
}
.live-indicator-tag { display: flex; align-items: center; gap: 0.3rem; font-weight: bold; font-size: 0.8rem; }
.pulse-dot-indicator {
    width: 7px; height: 7px; background-color: #10b981; border-radius: 50%; display: inline-block;
    animation: pulseLoop 1.8s infinite ease-in-out;
}
@keyframes pulseLoop { 0%, 100% { opacity: 0.4; } 50% { opacity: 1; } }
.digital-clock-label { 
    background: #1f2937; color: #fff; padding: 0.2rem 0.4rem; 
    border-radius: 4px; font-family: monospace; font-size: 0.75rem; 
}

/* Contextual Dynamic Saturday Option Bar Layout Rules */
.saturday-bar {
    background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
    border: 1px solid #f59e0b;
    border-radius: 6px;
    padding: 0.5rem 0.75rem;
    margin-bottom: 0.6rem;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}
.sat-bar-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    flex-wrap: wrap;
}
.sat-bar-content label {
    font-size: 0.8rem;
    color: #b45309;
}
.sat-bar-content select {
    max-width: 240px;
    border-color: #d97706;
    background-color: #ffffff;
    font-weight: 600;
    color: #451a03;
    height: 30px;
    padding: 0.2rem 0.4rem;
}

/* Timeline Cards Lists */
.vertical-today-list-container { display: flex; flex-direction: column; gap: 0.4rem; width: 100%; }
.vertical-period-card {
    display: flex; background: #ffffff; border: 1px solid var(--border-color);
    border-radius: 6px; overflow: hidden;
}
.card-time-column {
    width: 75px; background: #f9fafb; border-right: 1px solid var(--border-color);
    padding: 0.4rem 0.25rem; display: flex; flex-direction: column;
    justify-content: center; align-items: center; text-align: center; flex-shrink: 0;
}
.card-time-column .lbl-id { font-size: 0.75rem; font-weight: bold; color: #374151; }
.card-time-column .lbl-time-range { font-size: 0.65rem; color: var(--text-muted); margin-top: 0.05rem; }

.card-info-column { padding: 0.4rem 0.5rem; flex-grow: 1; display: flex; flex-direction: column; justify-content: center; }
.card-meta-main { font-size: 0.85rem; font-weight: bold; color: #111827; }
.card-meta-sub { font-size: 0.7rem; color: var(--text-muted); margin-top: 0.05rem; }

.text-warning { color: #d97706 !important; }
.text-muted { color: #9ca3af !important; }
.break-card-type .card-time-column { background: #fffbeb; }
.off-card-type { opacity: 0.6; }

/* Realtime Sync Color Highlight States */
.vertical-period-card.period-live-highlight-active { background-color: var(--live-highlight-bg); border: 1.5px solid var(--live-highlight-border); }
.period-live-highlight-active .card-time-column { background-color: #a7f3d0; border-right-color: var(--live-highlight-border); }
.period-live-highlight-active .card-meta-main { color: var(--live-highlight-text); }
.live-status-tag {
    align-self: flex-start; background: var(--live-highlight-border); color: #ffffff;
    font-size: 0.6rem; font-weight: 800; padding: 0.05rem 0.25rem; border-radius: 3px; margin-bottom: 0.1rem;
}
.weekend-empty-placeholder {
    background: #fff; padding: 1.2rem; border-radius: 6px; text-align: center;
    border: 1px dashed var(--border-color); color: var(--text-muted);
}

/* Forms System */
.card { background: var(--card-bg); padding: 0.75rem; border-radius: 6px; box-shadow: 0 1px 2px rgba(0,0,0,0.02); margin: 0.4rem auto; }
.card h2 { font-size: 1rem; margin-bottom: 0.2rem; }
.subtitle { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 0.5rem; }
hr { border: 0; border-top: 1px solid var(--border-color); margin-bottom: 0.5rem; }

.login-card { max-width: 360px; margin-top: 1.5rem; }
.auth-tabs { display: flex; margin-bottom: 0.75rem; border-bottom: 2px solid var(--border-color); }
.auth-tab-btn { flex: 1; padding: 0.5rem; background: none; border: none; font-weight: 600; font-size: 0.85rem; cursor: pointer; color: var(--text-muted); }
.auth-tab-btn.active { color: var(--primary-color); border-bottom: 2px solid var(--primary-color); }
.form-group { margin-bottom: 0.6rem; }
.form-group label { display: block; margin-bottom: 0.2rem; font-weight: 500; font-size: 0.8rem; }

input[type="text"], input[type="tel"], input[type="number"], input[type="email"], input[type="date"], select {
    width: 100%; padding: 0.45rem 0.6rem; border: 1px solid var(--border-color); border-radius: 4px; font-size: 0.85rem; background-color: #fff;
}
.btn-primary, .btn-secondary { width: 100%; padding: 0.5rem 0.75rem; border-radius: 4px; font-weight: 600; font-size: 0.85rem; cursor: pointer; border: none; }
.btn-primary { background: var(--primary-color); color: #fff; }
.btn-secondary { background: var(--secondary-color); color: #fff; }

.checkbox-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(85px, 1fr)); gap: 0.3rem; background: #f9fafb; padding: 0.4rem; border-radius: 4px; border: 1px solid var(--border-color); }
.checkbox-item { display: flex; align-items: center; font-size: 0.75rem; gap: 0.25rem; cursor: pointer; }
.badge-container { display: flex; flex-wrap: wrap; gap: 0.25rem; margin-top: 0.3rem; }

/* Building Names Layout Grid */
.building-names-inputs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 0.4rem;
    background: #f8fafc;
    padding: 0.5rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}
.building-input-row {
    display: flex;
    align-items: center;
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}
.bldg-index-tag {
    background: #e2e8f0;
    color: #475569;
    padding: 0.45rem 0.6rem;
    font-weight: bold;
    font-size: 0.75rem;
    border-right: 1px solid var(--border-color);
}
.building-input-row input {
    border: none !important;
    border-radius: 0 !important;
    padding: 0.35rem 0.5rem !important;
    font-size: 0.8rem !important;
}

/* Grid Table Rules */
.matrix-heading-row h3 { margin: 0; font-size: 0.9rem; }
.mobile-hint { display: block; font-size: 0.7rem; color: #6b7280; }
.table-container { background: #fff; border-radius: 6px; border: 1px solid var(--border-color); overflow-x: auto; width: 100%; -webkit-overflow-scrolling: touch; }
table { width: 100%; border-collapse: separate; border-spacing: 0; }
th, td { border-right: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); padding: 0.4rem 0.25rem; min-width: 60px; font-size: 0.7rem; text-align: center; }
th { background: #f9fafb; font-weight: 600; }
.sticky-col { position: sticky; left: 0; background-color: #f9fafb; z-index: 2; border-right: 2px solid var(--border-color) !important; min-width: 65px !important; }

.break-row-cell { background-color: #fef3c7; color: #d97706; font-style: italic; }
.off-subject-cell { background-color: #f9fafb; color: #9ca3af; }
.active-subject-cell { background-color: #e0e7ff; color: #4338ca; }
.cell-class-div { font-weight: bold; font-size: 0.75rem; }
.cell-sub-small { font-size: 0.65rem; opacity: 0.8; }
.cell-bldg-small { font-size: 0.6rem; color: #64748b; margin-top: 1px; font-style: italic; }
.badge { background: #e0e7ff; color: #4338ca; padding: 0.1rem 0.3rem; border-radius: 3px; font-size: 0.7rem; display: inline-block; }

/* Wizard Input Items */
.period-setup-row { background: #ffffff; border: 1px solid var(--border-color); border-radius: 6px; padding: 0.5rem 0.6rem; margin-bottom: 0.4rem; }
.period-time-info { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.4rem; border-bottom: 1px dashed var(--border-color); }
.period-time-info strong { color: var(--primary-color); font-size: 0.8rem; }
.period-time-info span { font-size: 0.7rem; color: var(--text-muted); }

.field-group-row { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0.25rem; }
.input-stacked-wrap { display: block; }
.select-field-label { display: block; font-size: 0.65rem; color: var(--text-muted); margin-bottom: 0.1rem; }
.field-group-row select { padding: 0.25rem; font-size: 0.75rem; border-radius: 4px; height: 28px; width: 100%; }
.break-separator-row { background: #fef3c7; color: #d97706; text-align: center; padding: 0.3rem; font-size: 0.7rem; border-radius: 4px; margin-bottom: 0.4rem; font-weight: 500; }
.slot-disabled { opacity: 0.4; background-color: #f9fafb; }

.wizard-actions { display: flex; justify-content: space-between; margin-top: 0.6rem; gap: 0.4rem; }
.wizard-actions .btn-primary, .wizard-actions .btn-secondary { flex: 1; }
.wizard-header { display: flex; justify-content: space-between; align-items: center; }
.day-badge { background: #f59e0b; color: #fff; padding: 0.1rem 0.4rem; border-radius: 10px; font-weight: bold; font-size: 0.7rem; }

.hidden { display: none !important; }
.page { display: none; }
.page.active { display: block; }

/* MEDIA ADAPTATIONS FOR HANDHELDS */
@media (max-width: 768px) {
    .menu-toggle { display: block; }
    .nav-links {
        display: flex; flex-direction: column; width: 100%; position: absolute;
        top: 100%; left: 0; background: #ffffff; box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        padding: 0.2rem 0; z-index: 1000;
    }
    .nav-links.mobile-collapsed { display: none; }
    nav .nav-links button { width: 100%; text-align: left; padding: 0.6rem 0.8rem; border-radius: 0; border-bottom: 1px solid var(--border-color); }
    .field-group-row { grid-template-columns: repeat(2, 1fr); gap: 0.4rem; }
    .status-dropdown-cell { grid-column: span 2; }
    .sat-bar-content { flex-direction: column; align-items: flex-start; gap: 0.3rem; }
    .sat-bar-content select { max-width: 100%; width: 100%; }
}

@media (max-width: 480px) {
    .field-group-row { grid-template-columns: 1fr; gap: 0.2rem; }
    .status-dropdown-cell { grid-column: span 1; }
    .input-stacked-wrap { display: flex; align-items: center; justify-content: space-between; background: #f9fafb; padding: 0.2rem 0.4rem; border-radius: 4px; border: 1px solid #f1f5f9; }
    .select-field-label { margin-bottom: 0; font-weight: 600; min-width: 60px; }
    .field-group-row select { width: 65%; height: 26px; padding: 0.15rem; font-size: 0.8rem; }
}