/* ============================================================
   Ohm's Law Calculator – Stylesheet
   Plugin: ohms-law-calculator  |  Version: 1.0.0
   All styles are scoped to .olc-wrap to avoid conflicts.
   ============================================================ */

/* ── CSS custom properties ───────────────────────────────── */
.olc-wrap {
    --olc-primary:      #1a73e8;
    --olc-primary-dark: #1557b0;
    --olc-accent:       #34a853;
    --olc-danger:       #d93025;
    --olc-bg:           #ffffff;
    --olc-surface:      #f8f9fc;
    --olc-border:       #dadce0;
    --olc-text:         #202124;
    --olc-muted:        #5f6368;
    --olc-radius:       10px;
    --olc-shadow:       0 2px 12px rgba(0,0,0,.10);
    --olc-transition:   .2s ease;

    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--olc-text);
    background: var(--olc-bg);
    border: 1px solid var(--olc-border);
    border-radius: var(--olc-radius);
    box-shadow: var(--olc-shadow);
    max-width: 680px;
    margin: 2em auto;
    overflow: hidden;
}

/* ── Header ─────────────────────────────────────────────── */
.olc-header {
    background: linear-gradient(135deg, #1a73e8 0%, #0d47a1 100%);
    color: #fff;
    padding: 2em 2em 1.6em;
    text-align: center;
}

.olc-icon {
    margin-bottom: .6em;
    opacity: .9;
}

.olc-icon svg {
    display: inline-block;
    vertical-align: middle;
}

.olc-title {
    margin: 0 0 .4em;
    font-size: 1.55rem;
    font-weight: 700;
    line-height: 1.2;
    color: #fff;
    border: none;
    padding: 0;
}

.olc-subtitle {
    margin: 0;
    font-size: .93rem;
    opacity: .88;
    line-height: 1.5;
}

/* ── Body ───────────────────────────────────────────────── */
.olc-body {
    padding: 1.8em 2em 2em;
}

/* ── Fields grid ────────────────────────────────────────── */
.olc-fields {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.1em 1.4em;
    margin-bottom: 1.4em;
}

.olc-field label {
    display: flex;
    align-items: center;
    gap: .45em;
    font-size: .88rem;
    font-weight: 600;
    color: var(--olc-muted);
    margin-bottom: .35em;
    text-transform: uppercase;
    letter-spacing: .03em;
}

.olc-symbol {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--olc-primary);
    color: #fff;
    font-size: .75rem;
    font-weight: 700;
    flex-shrink: 0;
}

.olc-input-wrap {
    display: flex;
    align-items: center;
    border: 1.5px solid var(--olc-border);
    border-radius: 7px;
    background: var(--olc-surface);
    overflow: hidden;
    transition: border-color var(--olc-transition), box-shadow var(--olc-transition);
}

.olc-input-wrap:focus-within {
    border-color: var(--olc-primary);
    box-shadow: 0 0 0 3px rgba(26,115,232,.18);
    background: #fff;
}

.olc-input {
    flex: 1;
    border: none;
    outline: none;
    padding: .6em .75em;
    font-size: 1rem;
    font-family: inherit;
    background: transparent;
    color: var(--olc-text);
    min-width: 0;
    -moz-appearance: textfield;
}

.olc-input::-webkit-outer-spin-button,
.olc-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.olc-unit {
    padding: 0 .75em;
    font-size: .9rem;
    font-weight: 600;
    color: var(--olc-muted);
    background: var(--olc-border);
    align-self: stretch;
    display: flex;
    align-items: center;
    border-left: 1px solid var(--olc-border);
    white-space: nowrap;
}

/* Calculated field highlight */
.olc-field.olc-calculated .olc-input-wrap {
    border-color: var(--olc-accent);
    background: #f0faf3;
}

.olc-field.olc-calculated .olc-input {
    color: #1e8e3e;
    font-weight: 600;
}

/* ── Action buttons ─────────────────────────────────────── */
.olc-actions {
    display: flex;
    gap: .9em;
    margin-bottom: 1.2em;
}

.olc-btn {
    flex: 1;
    padding: .7em 1.2em;
    border: none;
    border-radius: 7px;
    font-size: 1rem;
    font-family: inherit;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--olc-transition), transform var(--olc-transition), box-shadow var(--olc-transition);
    outline-offset: 3px;
}

.olc-btn:active {
    transform: scale(.97);
}

.olc-btn-calc {
    background: var(--olc-primary);
    color: #fff;
    box-shadow: 0 2px 6px rgba(26,115,232,.30);
}

.olc-btn-calc:hover,
.olc-btn-calc:focus {
    background: var(--olc-primary-dark);
    box-shadow: 0 4px 10px rgba(26,115,232,.35);
}

.olc-btn-reset {
    background: var(--olc-surface);
    color: var(--olc-muted);
    border: 1.5px solid var(--olc-border);
}

.olc-btn-reset:hover,
.olc-btn-reset:focus {
    background: #e8eaed;
    color: var(--olc-text);
}

/* ── Message / error banner ─────────────────────────────── */
.olc-message {
    min-height: 0;
    border-radius: 7px;
    font-size: .9rem;
    font-weight: 500;
    overflow: hidden;
    transition: all var(--olc-transition);
}

.olc-message:not(:empty) {
    padding: .7em 1em;
    margin-bottom: 1.2em;
}

.olc-message.olc-error {
    background: #fce8e6;
    color: var(--olc-danger);
    border: 1px solid #f5c6c2;
}

.olc-message.olc-success {
    background: #e6f4ea;
    color: #137333;
    border: 1px solid #b7dfbf;
}

/* ── Results panel ──────────────────────────────────────── */
.olc-results {
    background: var(--olc-surface);
    border: 1px solid var(--olc-border);
    border-radius: var(--olc-radius);
    padding: 1.2em 1.4em 1.4em;
    margin-bottom: 1.4em;
    animation: olcFadeIn .25s ease;
}

@keyframes olcFadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}

.olc-results-heading {
    margin: 0 0 1em;
    font-size: 1rem;
    font-weight: 700;
    color: var(--olc-muted);
    text-transform: uppercase;
    letter-spacing: .05em;
    border: none;
    padding: 0;
}

.olc-results-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: .9em;
}

.olc-result-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: #fff;
    border: 1px solid var(--olc-border);
    border-radius: 8px;
    padding: .9em .5em .8em;
    text-align: center;
    transition: border-color var(--olc-transition), box-shadow var(--olc-transition);
}

.olc-result-card.olc-res-computed {
    border-color: var(--olc-primary);
    box-shadow: 0 0 0 2px rgba(26,115,232,.12);
}

.olc-res-symbol {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--olc-primary);
    color: #fff;
    font-size: .8rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: .4em;
}

.olc-res-label {
    font-size: .72rem;
    color: var(--olc-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .03em;
    margin-bottom: .25em;
}

.olc-res-value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--olc-text);
    line-height: 1.2;
    word-break: break-all;
}

.olc-res-unit {
    font-size: .75rem;
    color: var(--olc-muted);
    margin-top: .15em;
}

/* ── Formula legend ─────────────────────────────────────── */
.olc-legend {
    border-top: 1px solid var(--olc-border);
    padding-top: 1.3em;
}

.olc-legend-heading {
    margin: 0 0 .9em;
    font-size: .95rem;
    font-weight: 700;
    color: var(--olc-muted);
    text-transform: uppercase;
    letter-spacing: .05em;
    border: none;
    padding: 0;
}

.olc-formula-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: .6em;
}

.olc-formula {
    background: var(--olc-surface);
    border: 1px solid var(--olc-border);
    border-radius: 7px;
    padding: .55em .8em;
    font-size: .88rem;
    display: flex;
    align-items: center;
    gap: .4em;
}

.olc-fvar {
    font-weight: 700;
    color: var(--olc-primary);
    min-width: 14px;
}

.olc-feq {
    color: var(--olc-muted);
}

.olc-fexpr {
    color: var(--olc-text);
}

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 520px) {
    .olc-body        { padding: 1.2em 1em 1.4em; }
    .olc-fields      { grid-template-columns: 1fr; }
    .olc-results-grid{ grid-template-columns: repeat(2, 1fr); }
    .olc-formula-grid{ grid-template-columns: repeat(2, 1fr); }
    .olc-actions     { flex-direction: column; }
}