/* ================================================================
   StudentOS — patches16.css
   1. Background gradient — more visible
   2. Formula solver modal & variable section
   3. Sidebar nav-hide settings section
   4. Routine planner tab
   5. Attendance tracker tab
   6. Worksheet tab
   7. Settings avatar thumbnail
   ================================================================ */

/* === 1. Background Gradient Enhancement === */
.ambient-light {
    background: var(--custom-bg,
        radial-gradient(ellipse at 28% 5%,  rgba(59,130,246,.30), transparent 55%),
        radial-gradient(ellipse at 88% 90%, rgba(236,72,153,.22), transparent 50%),
        radial-gradient(ellipse at 65% 52%, rgba(139,92,246,.10), transparent 45%)
    ) !important;
}
[data-theme="light"] .ambient-light {
    background: var(--custom-bg,
        radial-gradient(ellipse at 28% 5%,  rgba(59,130,246,.20), transparent 55%),
        radial-gradient(ellipse at 88% 90%, rgba(236,72,153,.14), transparent 50%),
        radial-gradient(ellipse at 65% 52%, rgba(139,92,246,.07), transparent 45%)
    ) !important;
}

/* === 2. Formula Solver — variable rows === */
.p16-var-row {
    display: grid;
    grid-template-columns: 72px 1fr 90px 30px;
    gap: 8px;
    align-items: center;
    padding: 9px 0;
    border-bottom: 1px solid var(--glass-border);
}
.p16-var-row:last-child { border-bottom: none; }
.p16-var-sym  { font-size: .78rem; font-weight: 700; color: var(--accent); font-family: 'JetBrains Mono', monospace; }
.p16-var-name { font-size: .67rem; color: var(--text-muted); margin-top: 1px; }
.p16-var-input {
    font-size: .8rem; padding: 5px 9px; border-radius: 8px;
    border: 1px solid var(--glass-border); background: var(--glass-hover);
    color: var(--text-main); outline: none; transition: border-color .15s; width: 100%;
}
.p16-var-input:focus { border-color: var(--accent); }
.p16-var-unit  {
    font-size: .73rem; padding: 5px 5px; border-radius: 8px;
    border: 1px solid var(--glass-border); background: var(--glass-hover);
    color: var(--text-muted); outline: none; cursor: pointer; width: 100%;
}
.p16-var-solve-btn {
    width: 26px; height: 26px; border-radius: 7px;
    background: transparent; border: 1.5px solid var(--glass-border);
    color: var(--text-muted); cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    font-size: .6rem; transition: all .15s; flex-shrink: 0;
}
.p16-var-solve-btn.active { background: var(--accent); border-color: transparent; color: #fff; }
.p16-var-solve-btn:hover:not(.active) { border-color: var(--accent); color: var(--accent); }

/* Result box */
.p16-result-box {
    background: color-mix(in srgb, var(--accent) 8%, transparent);
    border: 1.5px solid color-mix(in srgb, var(--accent) 25%, transparent);
    border-radius: 12px; padding: 14px 16px;
    display: flex; flex-direction: column; gap: 4px;
}
.p16-result-lbl { font-size: .68rem; text-transform: uppercase; letter-spacing: .06em; color: var(--text-muted); font-weight: 700; }
.p16-result-val { font-size: 1.55rem; font-weight: 800; color: var(--accent); font-family: 'JetBrains Mono', monospace; letter-spacing: -.02em; }
.p16-result-unit { font-size: .8rem; color: var(--text-muted); margin-left: 6px; }
.p16-result-saverow { display: flex; gap: 8px; align-items: center; margin-top: 8px; }

/* Constants panel */
.p16-const-toggle {
    display: flex; align-items: center; gap: 7px; cursor: pointer;
    font-size: .73rem; color: var(--text-muted); padding: 6px 0;
    user-select: none; border: none; background: none; text-align: left; width: 100%;
    transition: color .15s;
}
.p16-const-toggle:hover { color: var(--text-main); }
.p16-const-list { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; margin-top: 6px; }
.p16-const-item {
    display: flex; flex-direction: column; gap: 1px;
    padding: 7px 9px; border-radius: 9px; background: var(--glass-panel);
    cursor: pointer; transition: background .15s; border: 1px solid transparent;
}
.p16-const-item:hover { background: var(--glass-hover); border-color: color-mix(in srgb, var(--accent) 30%, transparent); }
.p16-const-item .ci-sym { font-size: .78rem; font-weight: 700; color: var(--accent); font-family: 'JetBrains Mono', monospace; }
.p16-const-item .ci-lbl { font-size: .62rem; color: var(--text-muted); line-height: 1.3; }
.p16-const-item .ci-val { font-size: .6rem; color: var(--text-muted); font-family: 'JetBrains Mono', monospace; opacity: .7; }

/* === Formula modal variable section === */
.p16-formula-vars {
    margin-top: 14px; padding-top: 12px;
    border-top: 1px solid var(--glass-border);
}
.p16-fv-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.p16-fv-title  { font-size: .7rem; text-transform: uppercase; letter-spacing: .06em; font-weight: 700; color: var(--text-muted); }
.p16-fv-row {
    display: grid; grid-template-columns: 44px 1fr 88px 88px 22px;
    gap: 6px; align-items: center; margin-bottom: 5px;
}
.p16-fv-sym-lbl { font-size: .75rem; font-weight: 700; color: var(--accent); font-family: 'JetBrains Mono', monospace; }
.p16-fv-btn {
    height: 24px; padding: 0 8px; border-radius: 6px; font-size: .68rem; font-weight: 600;
    cursor: pointer; border: 1px solid var(--glass-border); background: var(--glass-hover);
    color: var(--text-muted); transition: all .15s; white-space: nowrap;
}
.p16-fv-btn:hover { border-color: var(--accent); color: var(--accent); }
.p16-fv-del {
    width: 22px; height: 22px; padding: 0; border-radius: 5px; font-size: .6rem;
    color: var(--text-muted); background: transparent; border: 1px solid transparent;
    cursor: pointer; transition: all .15s;
    display: flex; align-items: center; justify-content: center;
}
.p16-fv-del:hover { color: #ef4444; border-color: rgba(239,68,68,.25); background: rgba(239,68,68,.08); }

/* === 3. Nav-hide settings === */
.p16-nav-toggle-row {
    display: flex; align-items: center; justify-content: space-between;
    padding: 8px 12px; border-radius: 10px; background: var(--glass-panel);
    border: 1px solid var(--glass-border); transition: background .15s;
}
.p16-nav-toggle-row:hover { background: var(--glass-hover); }
.p16-nav-toggle-info { display: flex; align-items: center; gap: 10px; }
.p16-nav-icon {
    width: 28px; height: 28px; border-radius: 8px;
    display: flex; align-items: center; justify-content: center; font-size: .82rem;
    background: color-mix(in srgb, var(--accent) 10%, transparent);
}

/* === 4. Routine Planner === */
.p16-routine-grid {
    display: grid; grid-template-columns: repeat(7,1fr); gap: 8px;
    flex: 1; overflow-y: auto; padding-bottom: 12px;
}
.p16-day-col { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.p16-day-hdr {
    text-align: center; font-size: .65rem; font-weight: 800; text-transform: uppercase;
    letter-spacing: .07em; color: var(--text-muted); padding: 5px 4px;
    border-radius: 8px; margin-bottom: 3px;
}
.p16-day-hdr.today {
    color: var(--accent);
    background: color-mix(in srgb, var(--accent) 10%, transparent);
}
.p16-routine-block {
    padding: 7px 9px; border-radius: 10px; cursor: pointer;
    border-left: 3px solid var(--bcolor, var(--accent));
    background: color-mix(in srgb, var(--bcolor, var(--accent)) 10%, transparent);
    transition: all .15s;
}
.p16-routine-block:hover { transform: translateY(-1px); box-shadow: 0 4px 14px rgba(0,0,0,.18); }
.p16-rb-time  { font-size: .6rem; color: var(--text-muted); font-weight: 600; }
.p16-rb-label { font-size: .77rem; font-weight: 700; color: var(--text-main); line-height: 1.2; margin-top: 1px; word-break: break-word; }
.p16-rb-dur   { font-size: .58rem; color: var(--text-muted); margin-top: 1px; }
.p16-day-add {
    width: 100%; padding: 6px 4px; border-radius: 8px; background: transparent;
    border: 1.5px dashed var(--glass-border); color: var(--text-muted);
    font-size: .68rem; cursor: pointer; transition: all .15s;
    display: flex; align-items: center; justify-content: center; gap: 4px;
}
.p16-day-add:hover {
    border-color: var(--accent); color: var(--accent);
    background: color-mix(in srgb, var(--accent) 5%, transparent);
}

/* === 5. Attendance Tracker === */
.p16-course-card {
    background: var(--glass-panel); border: 1px solid var(--glass-border);
    border-radius: 14px; padding: 14px 16px;
    display: flex; flex-direction: column; gap: 9px; transition: border-color .2s;
}
.p16-course-card:hover { border-color: color-mix(in srgb, var(--accent) 35%, transparent); }
.p16-course-hdr { display: flex; align-items: center; gap: 9px; }
.p16-course-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.p16-course-name { font-size: .9rem; font-weight: 700; flex: 1; }
.p16-attend-bar  { height: 5px; border-radius: 99px; background: var(--glass-hover); overflow: hidden; }
.p16-attend-fill { height: 100%; border-radius: 99px; transition: width .4s; }
.p16-attend-stat { display: flex; justify-content: space-between; font-size: .68rem; color: var(--text-muted); font-weight: 600; }
.p16-attend-actions { display: flex; gap: 6px; }
.p16-att-btn {
    flex: 1; padding: 7px 8px; border-radius: 9px; font-size: .75rem; font-weight: 700;
    cursor: pointer; transition: all .15s;
    display: flex; align-items: center; justify-content: center; gap: 5px;
    border: 1.5px solid transparent;
}
.p16-att-btn.attend { background: rgba(34,197,94,.09); border-color: rgba(34,197,94,.2); color: #22c55e; }
.p16-att-btn.attend:hover { background: #22c55e; color: #fff; }
.p16-att-btn.miss   { background: rgba(239,68,68,.09); border-color: rgba(239,68,68,.2); color: #ef4444; }
.p16-att-btn.miss:hover { background: #ef4444; color: #fff; }
.p16-att-btn.active-attend { background: #22c55e !important; color: #fff !important; border-color: #22c55e !important; }
.p16-att-btn.active-miss   { background: #ef4444 !important; color: #fff !important; border-color: #ef4444 !important; }
.p16-session-log { display: flex; flex-wrap: wrap; gap: 3px; }
.p16-session-dot { width: 8px; height: 8px; border-radius: 2px; }

/* === 6. Worksheet === */
.p16-ws-layout {
    display: grid; grid-template-columns: 210px 1fr; gap: 14px;
    flex: 1; overflow: hidden; min-height: 0;
}
.p16-ws-library { display: flex; flex-direction: column; gap: 5px; overflow-y: auto; padding-right: 2px; }
.p16-ws-lib-card {
    padding: 8px 11px; border-radius: 10px; background: var(--glass-panel);
    border: 1px solid var(--glass-border); cursor: grab;
    transition: all .15s; display: flex; flex-direction: column; gap: 2px;
}
.p16-ws-lib-card:hover { border-color: var(--accent); background: var(--glass-hover); }
.p16-ws-lib-card:active { cursor: grabbing; opacity: .65; }
.p16-ws-lib-title { font-size: .78rem; font-weight: 700; color: var(--text-main); }
.p16-ws-lib-expr  { font-size: .64rem; color: var(--text-muted); font-family: 'JetBrains Mono', monospace; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.p16-ws-canvas { display: flex; flex-direction: column; gap: 8px; overflow-y: auto; }
.p16-ws-step {
    background: var(--glass-panel); border: 1.5px solid var(--glass-border);
    border-radius: 14px; padding: 14px 16px; transition: border-color .15s;
}
.p16-ws-step.ws-drop-over { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 5%, transparent); }
.p16-ws-step.ws-dragging  { opacity: .4; }
.p16-ws-step-hdr { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.p16-ws-step-num {
    width: 22px; height: 22px; border-radius: 6px; background: var(--accent);
    color: #fff; font-size: .65rem; font-weight: 800;
    display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.p16-ws-step-title  { font-size: .88rem; font-weight: 700; flex: 1; }
.p16-ws-step-formula {
    font-size: .75rem; font-family: 'JetBrains Mono', monospace; color: var(--text-muted);
    margin-bottom: 10px; background: var(--glass-hover); padding: 6px 10px; border-radius: 8px;
}
.p16-ws-vars-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(130px,1fr)); gap: 8px; }
.p16-ws-var-cell  { display: flex; flex-direction: column; gap: 3px; }
.p16-ws-var-lbl   { font-size: .65rem; font-weight: 700; color: var(--accent); font-family: 'JetBrains Mono', monospace; }
.p16-ws-var-sub   { font-size: .6rem; color: var(--text-muted); }
.p16-ws-var-inp   {
    font-size: .78rem; padding: 5px 8px; border-radius: 7px;
    border: 1px solid var(--glass-border); background: var(--glass-hover);
    color: var(--text-main); outline: none; width: 100%; transition: border-color .15s;
}
.p16-ws-var-inp:focus { border-color: var(--accent); }
.p16-ws-result-row {
    display: flex; align-items: center; gap: 8px;
    margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--glass-border);
}
.p16-ws-result-badge {
    flex: 1; padding: 7px 11px; border-radius: 9px;
    background: color-mix(in srgb, var(--accent) 10%, transparent);
    border: 1px solid color-mix(in srgb, var(--accent) 20%, transparent);
    font-size: .82rem; font-weight: 800; color: var(--accent); font-family: 'JetBrains Mono', monospace;
}
.p16-ws-saved-badge {
    display: inline-flex; align-items: center; gap: 5px;
    padding: 3px 9px; border-radius: 7px;
    background: color-mix(in srgb, var(--accent) 12%, transparent);
    font-size: .68rem; font-weight: 700; color: var(--accent); font-family: 'JetBrains Mono', monospace;
}
.p16-ws-placeholder {
    border: 2px dashed var(--glass-border); border-radius: 14px; padding: 32px;
    text-align: center; color: var(--text-muted); font-size: .82rem;
    display: flex; flex-direction: column; align-items: center; gap: 10px;
    cursor: default; transition: all .15s;
}
.p16-ws-placeholder.drag-over {
    border-color: var(--accent); color: var(--accent);
    background: color-mix(in srgb, var(--accent) 5%, transparent);
}

/* === 7. Settings avatar thumbnail === */
#p16-settings-avatar {
    width: 34px; height: 34px; border-radius: 10px; overflow: hidden; flex-shrink: 0;
    display: flex; align-items: center; justify-content: center;
    font-size: .95rem; background: var(--accent); transition: all .2s;
}
#p16-settings-avatar img { width: 100%; height: 100%; object-fit: cover; }

/* Responsive */
@media (max-width: 780px) {
    .p16-routine-grid { grid-template-columns: repeat(auto-fit, minmax(110px, 1fr)); }
    .p16-ws-layout    { grid-template-columns: 1fr; }
    .p16-ws-library   { display: none; }
    .p16-var-row      { grid-template-columns: 64px 1fr 70px 26px; }
}