/* ================================================================
   StudentOS — patches29.css
   1.  Formula modal  — inline "Create formula" panel (My formulas tab)
   2.  Formula block  — improved variable rows, auto-compute indicator,
                        cleaner result panel, error display
   3.  Formula block  — "Solve for" chip strip below variable grid
   4.  Formula block  — @ref autocomplete dropdown
   ================================================================ */

/* ================================================================
   1.  FORMULA MODAL — CREATE FORMULA INLINE PANEL
   ================================================================ */

/* Toolbar row inside the My Formulas tab */
#p29-mine-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 20px 0;
    flex-shrink: 0;
}

#p29-create-formula-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    border-radius: 10px;
    border: 1px solid var(--glass-border);
    background: color-mix(in srgb, var(--accent) 10%, transparent);
    color: var(--accent);
    font-size: .78rem;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    transition: background .14s, border-color .14s;
}
#p29-create-formula-btn:hover {
    background: color-mix(in srgb, var(--accent) 18%, transparent);
    border-color: var(--accent);
}
#p29-create-formula-btn i {
    font-size: .78rem;
}

/* Create-formula form panel */
#p29-create-formula-form {
    margin: 10px 20px 0;
    padding: 16px 18px 18px;
    border-radius: 14px;
    border: 1.5px solid var(--accent);
    background: color-mix(in srgb, var(--accent) 5%, var(--glass-panel));
    flex-shrink: 0;
}
#p29-create-formula-form.hidden {
    display: none;
}

.p29-cf-form-title {
    font-size: .8rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 7px;
}
.p29-cf-form-title i {
    color: var(--accent);
}

.p29-cf-row {
    display: flex;
    gap: 8px;
    margin-bottom: 8px;
}
.p29-cf-row:last-of-type {
    margin-bottom: 0;
}
.p29-cf-field {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 3px;
}
.p29-cf-label {
    font-size: .67rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .05em;
    color: var(--text-muted);
}
.p29-cf-input,
.p29-cf-textarea {
    background: var(--glass-hover);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 7px 10px;
    color: var(--text-main);
    font-size: .8rem;
    font-family: inherit;
    outline: none;
    transition: border-color .12s;
    width: 100%;
    box-sizing: border-box;
}
.p29-cf-input:focus,
.p29-cf-textarea:focus {
    border-color: var(--accent);
}
.p29-cf-input::placeholder,
.p29-cf-textarea::placeholder {
    color: var(--text-muted);
    opacity: .6;
}
.p29-cf-textarea {
    resize: none;
    min-height: 52px;
    font-size: .78rem;
}
.p29-cf-input.mono {
    font-family: 'JetBrains Mono', monospace;
}

/* Detected variables preview */
.p29-cf-vars-preview {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-top: 4px;
    min-height: 18px;
}
.p29-cf-var-chip {
    font-size: .64rem;
    font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
    padding: 2px 8px;
    border-radius: 99px;
    background: color-mix(in srgb, var(--accent) 12%, transparent);
    border: 1px solid color-mix(in srgb, var(--accent) 24%, transparent);
    color: var(--accent);
}
.p29-cf-vars-label {
    font-size: .64rem;
    color: var(--text-muted);
    align-self: center;
}

/* Form action row */
.p29-cf-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 12px;
}
.p29-cf-save-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 7px 16px;
    border-radius: 9px;
    border: none;
    background: var(--accent);
    color: #fff;
    font-size: .78rem;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    transition: opacity .12s;
}
.p29-cf-save-btn:hover { opacity: .88; }
.p29-cf-cancel-btn {
    display: inline-flex;
    align-items: center;
    padding: 7px 12px;
    border-radius: 9px;
    border: 1px solid var(--glass-border);
    background: var(--glass-hover);
    color: var(--text-muted);
    font-size: .78rem;
    font-family: inherit;
    cursor: pointer;
    transition: color .12s, border-color .12s;
}
.p29-cf-cancel-btn:hover { border-color: var(--accent); color: var(--accent); }
.p29-cf-err {
    font-size: .72rem;
    color: #f87171;
    min-height: 16px;
}

/* Edit-formula overlay inside the modal (reuses same form structure) */
#p29-edit-formula-form {
    margin: 10px 20px 0;
    padding: 16px 18px 18px;
    border-radius: 14px;
    border: 1.5px solid color-mix(in srgb, #f59e0b 70%, transparent);
    background: color-mix(in srgb, #f59e0b 5%, var(--glass-panel));
    flex-shrink: 0;
}
#p29-edit-formula-form.hidden {
    display: none;
}

/* ================================================================
   2.  FORMULA BLOCK — IMPROVED VARIABLE ROWS
   ================================================================ */

/* Replace the current grid with a stacked-label style */
.p29-vars-wrap {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

/* "Solve for:" label + chip strip */
.p29-solve-for-row {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
    margin-bottom: 2px;
}
.p29-solve-for-label {
    font-size: .67rem;
    text-transform: uppercase;
    letter-spacing: .06em;
    font-weight: 700;
    color: var(--text-muted);
    white-space: nowrap;
}
.p29-solve-for-chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px 3px 8px;
    border-radius: 99px;
    font-size: .7rem;
    font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
    cursor: pointer;
    border: 1.5px solid var(--glass-border);
    background: var(--glass-hover);
    color: var(--text-muted);
    transition: all .12s;
    white-space: nowrap;
}
.p29-solve-for-chip.active {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 14%, transparent);
    color: var(--accent);
}
.p29-solve-for-chip:hover:not(.active) {
    border-color: color-mix(in srgb, var(--accent) 50%, transparent);
    color: var(--text-main);
}

/* Two-column variable input grid */
.p29-var-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 6px;
}
.p29-var-item {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.p29-var-sym-label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2px;
}
.p29-var-sym {
    font-size: .67rem;
    font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
    color: var(--accent);
    letter-spacing: .02em;
}
.p29-var-sym.solve-for-sym {
    color: color-mix(in srgb, var(--accent) 70%, var(--text-muted));
    font-style: italic;
}
.p29-var-name-hint {
    font-size: .6rem;
    color: var(--text-muted);
    opacity: .7;
    max-width: 90px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.p29-var-inp-wrap {
    display: flex;
    align-items: center;
    gap: 0;
    border-radius: 9px;
    border: 1.5px solid var(--glass-border);
    background: var(--glass-hover);
    overflow: hidden;
    transition: border-color .12s;
}
.p29-var-inp-wrap:focus-within {
    border-color: var(--accent);
}
.p29-var-inp-wrap.is-solve-for {
    border-color: color-mix(in srgb, var(--accent) 40%, transparent);
    background: color-mix(in srgb, var(--accent) 6%, transparent);
}
.p29-var-input {
    flex: 1;
    min-width: 0;
    background: none;
    border: none;
    outline: none;
    font-size: .82rem;
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-main);
    padding: 6px 8px;
}
.p29-var-input.solve-for-inp {
    color: var(--accent);
    font-weight: 700;
}
.p29-var-input::placeholder {
    color: var(--text-muted);
    opacity: .5;
    font-size: .72rem;
}

/* ref-use button: small @ trigger on each variable input */
.p29-var-ref-btn {
    flex-shrink: 0;
    background: none;
    border: none;
    border-left: 1px solid var(--glass-border);
    padding: 0 7px;
    height: 100%;
    font-size: .64rem;
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-muted);
    cursor: pointer;
    transition: color .12s, background .12s;
    align-self: stretch;
    display: flex;
    align-items: center;
}
.p29-var-ref-btn:hover {
    color: var(--accent);
    background: color-mix(in srgb, var(--accent) 10%, transparent);
}

/* ================================================================
   3.  @REF AUTOCOMPLETE DROPDOWN
   ================================================================ */
.p29-ref-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 9999;
    background: var(--glass-panel);
    border: 1px solid var(--glass-border);
    border-radius: 9px;
    box-shadow: 0 8px 28px rgba(0,0,0,.28);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    overflow: hidden;
    margin-top: 2px;
}
.p29-ref-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 7px 12px;
    cursor: pointer;
    transition: background .1s;
}
.p29-ref-item:hover {
    background: var(--glass-hover);
}
.p29-ref-item-name {
    font-size: .74rem;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    color: var(--accent);
}
.p29-ref-item-val {
    font-size: .7rem;
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-muted);
}
.p29-ref-empty {
    padding: 8px 12px;
    font-size: .74rem;
    color: var(--text-muted);
    text-align: center;
}

/* ================================================================
   4.  FORMULA BLOCK — IMPROVED RESULT PANEL
   ================================================================ */

/* Auto-compute badge: shown when all inputs are filled */
.p29-autocompute-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: .62rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .05em;
    padding: 2px 8px;
    border-radius: 99px;
    background: color-mix(in srgb, #22c55e 12%, transparent);
    border: 1px solid color-mix(in srgb, #22c55e 25%, transparent);
    color: #22c55e;
    margin-left: auto;
}

/* Compute button row */
.p29-formula-btn-row {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}

/* Error banner inside the block */
.p29-formula-error {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 7px 12px;
    border-radius: 9px;
    background: color-mix(in srgb, #ef4444 10%, transparent);
    border: 1px solid color-mix(in srgb, #ef4444 25%, transparent);
    font-size: .74rem;
    color: #f87171;
}
.p29-formula-error i {
    flex-shrink: 0;
    font-size: .8rem;
}

/* Improved result panel */
.p29-result-panel {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    padding: 12px 16px;
    border-radius: 13px;
    background: color-mix(in srgb, var(--accent) 8%, transparent);
    border: 1.5px solid color-mix(in srgb, var(--accent) 24%, transparent);
}
.p29-result-sym {
    font-size: .75rem;
    font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-muted);
    white-space: nowrap;
}
.p29-result-val {
    font-size: 1.4rem;
    font-weight: 800;
    font-family: 'JetBrains Mono', monospace;
    color: var(--accent);
    line-height: 1;
    word-break: break-all;
}
.p29-result-copy-btn {
    flex-shrink: 0;
    background: none;
    border: 1px solid var(--glass-border);
    border-radius: 7px;
    padding: 4px 9px;
    font-size: .7rem;
    font-family: inherit;
    color: var(--text-muted);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: border-color .12s, color .12s;
}
.p29-result-copy-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* Save-as row inside result panel */
.p29-saveas-row {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-basis: 100%;
    margin-top: 2px;
}
.p29-saveas-inp {
    flex: 1;
    max-width: 160px;
    padding: 5px 9px;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
    background: var(--glass-hover);
    font-size: .74rem;
    color: var(--text-main);
    font-family: 'JetBrains Mono', monospace;
    outline: none;
    transition: border-color .12s;
}
.p29-saveas-inp:focus { border-color: var(--accent); }
.p29-saveas-inp::placeholder { color: var(--text-muted); opacity: .55; font-size: .68rem; }
.p29-saveas-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 5px 11px;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
    background: var(--glass-hover);
    font-size: .72rem;
    font-family: inherit;
    color: var(--text-muted);
    cursor: pointer;
    transition: border-color .12s, color .12s;
}
.p29-saveas-btn:hover { border-color: var(--accent); color: var(--accent); }
.p29-saveas-saved-name {
    font-size: .68rem;
    font-family: 'JetBrains Mono', monospace;
    color: #22c55e;
    display: flex;
    align-items: center;
    gap: 4px;
}