/* =====================================================
   Resistor Calculator Pro — WordPress Plugin CSS
   Design: Electronics / PCB Green Theme
   Benchmark: calculator.net/resistor-calculator.html
===================================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@500;600&display=swap');

:root {
    --rc-green:    #1a7a4a;
    --rc-green-lt: #22a05a;
    --rc-green-bg: #edf7f1;
    --rc-pcb:      #0f4c2a;
    --rc-gold:     #d4a017;
    --rc-dark:     #1a1f2e;
    --rc-surface:  #ffffff;
    --rc-bg:       #f4f7f5;
    --rc-border:   #d8e8df;
    --rc-text:     #1a2e22;
    --rc-muted:    #5a7a65;
    --rc-red:      #e02020;
    --rc-radius:   12px;
    --rc-mono:     'JetBrains Mono', monospace;
    --rc-font:     'Inter', sans-serif;
}

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

.rcp-wrapper {
    font-family: var(--rc-font);
    max-width: 860px;
    margin: 0 auto;
    color: var(--rc-text);
    border-radius: var(--rc-radius);
    overflow: hidden;
    box-shadow: 0 4px 32px rgba(26,122,74,0.12);
}

/* ── Header ── */
.rcp-header {
    background: var(--rc-pcb);
    background-image:
        radial-gradient(ellipse at 15% 60%, rgba(26,122,74,0.4) 0%, transparent 55%),
        radial-gradient(ellipse at 85% 20%, rgba(212,160,23,0.15) 0%, transparent 50%);
    padding: 34px 32px 28px;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.rcp-header::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--rc-green-lt), var(--rc-gold), var(--rc-green-lt));
}
/* PCB trace decoration */
.rcp-header::before {
    content: '';
    position: absolute;
    top: 20px; left: 30px;
    width: 60px; height: 60px;
    border: 2px solid rgba(26,122,74,0.3);
    border-radius: 50%;
    box-shadow: 0 0 0 8px rgba(26,122,74,0.1);
}
.rcp-header-icon { font-size: 2.4rem; display: block; margin-bottom: 8px; filter: drop-shadow(0 0 16px rgba(212,160,23,0.6)); }
.rcp-title { font-size: 1.85rem; font-weight: 700; color: #fff; letter-spacing: -0.3px; margin-bottom: 5px; }
.rcp-subtitle { color: rgba(255,255,255,0.5); font-size: 0.87rem; }

/* ── Tabs ── */
.rcp-tabs {
    display: flex;
    background: #f0f5f2;
    border-bottom: 2px solid var(--rc-border);
    padding: 0 20px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    gap: 2px;
}
.rcp-tab {
    background: none; border: none;
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
    padding: 14px 20px;
    font-family: var(--rc-font);
    font-size: 0.875rem; font-weight: 600;
    color: var(--rc-muted);
    cursor: pointer; white-space: nowrap;
    transition: all 0.18s;
}
.rcp-tab:hover { color: var(--rc-green); }
.rcp-tab.active { color: var(--rc-green); border-bottom-color: var(--rc-green); }

/* ── Panel ── */
.rcp-panel { display: none; background: var(--rc-surface); padding: 28px 30px; border: 1px solid var(--rc-border); border-top: none; }
.rcp-panel.active { display: block; }

/* ── Intro ── */
.rcp-intro {
    background: var(--rc-green-bg);
    border-left: 4px solid var(--rc-green);
    border-radius: 0 8px 8px 0;
    padding: 12px 16px;
    margin-bottom: 22px;
    font-size: 0.88rem;
    color: #1a3a28;
    line-height: 1.6;
}

/* ── Band Selector Buttons ── */
.rcp-band-selector {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 22px;
    flex-wrap: wrap;
}
.rcp-band-selector label { font-size: 0.85rem; font-weight: 600; color: var(--rc-text); }
.rcp-band-btns { display: flex; gap: 6px; }
.rcp-band-btn {
    padding: 7px 16px;
    border: 1.5px solid var(--rc-border);
    border-radius: 20px;
    background: #fff;
    font-family: var(--rc-font);
    font-size: 0.82rem; font-weight: 600;
    color: var(--rc-muted);
    cursor: pointer;
    transition: all 0.15s;
}
.rcp-band-btn:hover { border-color: var(--rc-green); color: var(--rc-green); }
.rcp-band-btn.active { background: var(--rc-green); border-color: var(--rc-green); color: #fff; }

/* ── Visual Resistor ── */
.rcp-resistor-visual {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 0 auto 24px;
    gap: 12px;
    max-width: 440px;
}
.rcp-resistor-body {
    display: flex;
    align-items: center;
    width: 100%;
    height: 56px;
}
.rcp-wire-left, .rcp-wire-right {
    flex: 1;
    height: 3px;
    background: linear-gradient(90deg, #888, #aaa);
    border-radius: 2px;
}
.rcp-resistor-ceramic {
    flex: 0 0 240px;
    height: 42px;
    background: linear-gradient(180deg, #d4b896 0%, #c8a870 40%, #b8954e 70%, #c8a870 100%);
    border-radius: 8px;
    display: flex;
    align-items: stretch;
    overflow: hidden;
    box-shadow: 0 3px 12px rgba(0,0,0,0.2), inset 0 1px 0 rgba(255,255,255,0.3);
    position: relative;
}
.rcp-band {
    flex: 1;
    transition: background-color 0.2s;
}
.rcp-band-gap {
    flex: 0.4;
    background: transparent !important;
}
.rcp-resistor-labels {
    display: flex;
    justify-content: center;
    gap: 4px;
    font-size: 0.72rem;
    color: var(--rc-muted);
    font-weight: 500;
    flex-wrap: wrap;
}

/* ── Color Grid ── */
.rcp-color-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 14px;
    margin-bottom: 22px;
}
.rcp-color-field { display: flex; flex-direction: column; gap: 5px; }
.rcp-color-field label { font-size: 0.78rem; font-weight: 600; color: var(--rc-text); text-transform: uppercase; letter-spacing: 0.4px; }

.rcp-color-select-wrap { position: relative; }
.rcp-color-swatch {
    position: absolute;
    left: 10px; top: 50%;
    transform: translateY(-50%);
    width: 16px; height: 16px;
    border-radius: 50%;
    border: 1.5px solid rgba(0,0,0,0.2);
    pointer-events: none;
    z-index: 1;
    transition: background 0.15s;
}
.rcp-color-field select {
    width: 100%;
    padding: 9px 10px 9px 34px;
    border: 1.5px solid var(--rc-border);
    border-radius: 8px;
    font-family: var(--rc-font);
    font-size: 0.87rem;
    color: var(--rc-text);
    background: #fff;
    appearance: none; -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='11' height='11' viewBox='0 0 24 24' fill='none' stroke='%235a7a65' stroke-width='2.5'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    cursor: pointer;
    outline: none;
    transition: border-color 0.15s;
}
.rcp-color-field select:focus { border-color: var(--rc-green); box-shadow: 0 0 0 3px rgba(26,122,74,0.1); }

/* ── Form Fields ── */
.rcp-form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 22px; }
.rcp-field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.rcp-field-full { grid-column: 1 / -1; }
.rcp-field label { font-size: 0.83rem; font-weight: 600; color: var(--rc-text); }

.rcp-input-row { display: flex; gap: 8px; align-items: stretch; }
.rcp-input-row input { flex: 1; min-width: 0; }
.rcp-input-row select { flex: 0 0 180px; }

.rcp-wrapper input[type="text"],
.rcp-wrapper input[type="number"],
.rcp-wrapper select,
.rcp-wide-input {
    width: 100%;
    padding: 10px 13px;
    border: 1.5px solid var(--rc-border);
    border-radius: 8px;
    font-family: var(--rc-font);
    font-size: 0.9rem;
    color: var(--rc-text);
    background: #fff;
    outline: none;
    transition: border-color 0.18s, box-shadow 0.18s;
    appearance: none; -webkit-appearance: none;
}
.rcp-wrapper select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='11' height='11' viewBox='0 0 24 24' fill='none' stroke='%235a7a65' stroke-width='2.5'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 30px;
    cursor: pointer;
}
.rcp-wrapper input:focus, .rcp-wrapper select:focus {
    border-color: var(--rc-green);
    box-shadow: 0 0 0 3px rgba(26,122,74,0.1);
}
.rcp-wrapper input::placeholder { color: #b0c4b8; }
.rcp-unit-tag {
    display: flex; align-items: center;
    padding: 0 13px;
    background: #edf2ef;
    border: 1.5px solid var(--rc-border);
    border-radius: 8px;
    font-size: 0.82rem; font-weight: 600;
    color: var(--rc-muted); white-space: nowrap;
}

/* ── Diagrams ── */
.rcp-resistor-diagram {
    margin: 16px 0;
    padding: 14px 20px;
    background: #f8faf9;
    border: 1.5px dashed var(--rc-border);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.rcp-diagram-label { font-family: var(--rc-mono); font-size: 0.88rem; color: var(--rc-muted); font-weight: 500; }

/* ── Button ── */
.rcp-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--rc-green);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 12px 26px;
    font-family: var(--rc-font);
    font-size: 0.92rem; font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(26,122,74,0.3);
    transition: all 0.18s;
}
.rcp-btn:hover { background: var(--rc-pcb); box-shadow: 0 6px 20px rgba(26,122,74,0.4); transform: translateY(-1px); }
.rcp-btn:active { transform: scale(0.98); }

/* ── Result ── */
.rcp-result {
    margin-top: 22px;
    border: 1.5px solid var(--rc-border);
    border-radius: 10px;
    overflow: hidden;
    animation: rcpFadeIn 0.3s ease;
}
@keyframes rcpFadeIn { from { opacity:0; transform:translateY(8px); } to { opacity:1; transform:translateY(0); } }
.rcp-result-hdr {
    display: flex; align-items: center; gap: 10px;
    background: linear-gradient(90deg, var(--rc-pcb), #1a4a30);
    padding: 13px 18px; color: #fff;
}
.rcp-result-hdr h3 { font-size: 0.95rem; font-weight: 600; }
.rcp-result-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; }
.rcp-rcard {
    padding: 18px 14px; text-align: center;
    border-right: 1px solid var(--rc-border);
    background: #fff;
}
.rcp-rcard:last-child { border-right: none; }
.rcp-rcard.primary { background: linear-gradient(135deg, #edf7f1, #e0f2e8); }
.rcp-rlabel { font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; color: var(--rc-muted); margin-bottom: 7px; }
.rcp-rval { font-family: var(--rc-mono); font-size: 1.2rem; font-weight: 600; color: var(--rc-green); }
.rcp-rcard.primary .rcp-rval { font-size: 1.45rem; }
.rcp-result-note { padding: 11px 18px; background: #f8faf9; border-top: 1px solid var(--rc-border); font-size: 0.81rem; color: #2a4a32; line-height: 1.6; }

/* Color result specifics */
.rcp-color-result-band {
    display: flex; gap: 8px; margin: 10px 0;
    flex-wrap: wrap; align-items: center;
}
.rcp-color-chip {
    display: inline-flex; align-items: center; gap: 5px;
    padding: 3px 10px; border-radius: 12px;
    font-size: 0.78rem; font-weight: 600;
    border: 1px solid rgba(0,0,0,0.15);
}
.rcp-tol-bar {
    height: 8px; border-radius: 4px;
    background: linear-gradient(90deg, var(--rc-green-lt), var(--rc-gold));
    margin: 6px 0;
}

/* ── Reference Table ── */
.rcp-section-title { font-size: 0.92rem; font-weight: 700; color: var(--rc-text); margin-bottom: 12px; }
.rcp-table-wrap { }
.rcp-scroll { overflow-x: auto; border-radius: 8px; border: 1px solid var(--rc-border); }
.rcp-table { width: 100%; border-collapse: collapse; font-size: 0.83rem; min-width: 480px; }
.rcp-table thead tr { background: var(--rc-pcb); color: #fff; }
.rcp-table th { padding: 10px 14px; text-align: left; font-size: 0.78rem; font-weight: 600; letter-spacing: 0.3px; }
.rcp-table td { padding: 8px 14px; border-bottom: 1px solid var(--rc-border); }
.rcp-table tbody tr:hover { background: var(--rc-green-bg); }
.rcp-table tbody tr:last-child td { border-bottom: none; }
.rcp-dot { display: inline-block; width: 14px; height: 14px; border-radius: 50%; margin-right: 6px; vertical-align: middle; }

/* ── Info Section ── */
.rcp-info-section { background: var(--rc-bg); border: 1px solid var(--rc-border); border-top: none; border-radius: 0 0 var(--rc-radius) var(--rc-radius); padding: 26px 30px; }
.rcp-info-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.rcp-info-card { background: #fff; border: 1px solid var(--rc-border); border-radius: 10px; padding: 16px 18px; }
.rcp-info-card h4 { font-size: 0.88rem; font-weight: 700; color: var(--rc-text); margin-bottom: 7px; }
.rcp-info-card p { font-size: 0.83rem; color: #3a5a42; line-height: 1.65; }

/* ── Responsive ── */
@media (max-width: 600px) {
    .rcp-header { padding: 22px 16px 18px; }
    .rcp-panel, .rcp-info-section { padding: 18px 14px; }
    .rcp-form-grid { grid-template-columns: 1fr; }
    .rcp-field-full { grid-column: 1; }
    .rcp-result-cards { grid-template-columns: 1fr 1fr; }
    .rcp-rcard { border-bottom: 1px solid var(--rc-border); }
    .rcp-rcard:nth-child(even) { border-right: none; }
    .rcp-info-grid { grid-template-columns: 1fr; }
    .rcp-color-grid { grid-template-columns: 1fr 1fr; }
    .rcp-tabs { padding: 0 6px; }
    .rcp-tab { padding: 12px 10px; font-size: 0.80rem; }
    .rcp-input-row select { flex: 0 0 120px; }
    .rcp-resistor-ceramic { flex: 0 0 180px; }
}