/* ===================================================
   Engine Horsepower Calculator Pro
   WordPress Plugin — Hostinger Compatible
   Design: Racing / Performance — Dark accents
=================================================== */
@import url('https://fonts.googleapis.com/css2?family=Barlow:wght@400;500;600;700;800&family=Barlow+Condensed:wght@600;700;800&family=JetBrains+Mono:wght@500;600&display=swap');

:root {
    --hp-red:       #e8212b;
    --hp-red-dk:    #c01920;
    --hp-orange:    #ff6b1a;
    --hp-dark:      #111318;
    --hp-dark2:     #1a1e27;
    --hp-dark3:     #22273a;
    --hp-border:    #2e3448;
    --hp-surface:   #ffffff;
    --hp-bg:        #f4f5f9;
    --hp-text:      #1a1e2e;
    --hp-muted:     #6b7394;
    --hp-gold:      #f5a623;
    --hp-green:     #00c07a;
    --hp-radius:    14px;
    --hp-font:      'Barlow', sans-serif;
    --hp-mono:      'JetBrains Mono', monospace;
    --hp-display:   'Barlow Condensed', sans-serif;
}

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

.ehpc-wrapper {
    font-family: var(--hp-font);
    max-width: 860px;
    margin: 0 auto;
    color: var(--hp-text);
    border-radius: var(--hp-radius);
    overflow: hidden;
    box-shadow: 0 4px 40px rgba(0,0,0,0.12);
}

/* ── Header ── */
.ehpc-header {
    background: var(--hp-dark);
    background-image:
        radial-gradient(ellipse at 20% 50%, rgba(232,33,43,0.18) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 30%, rgba(255,107,26,0.10) 0%, transparent 55%);
    padding: 36px 36px 30px;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.ehpc-header::before {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--hp-red), var(--hp-orange), var(--hp-red));
}
.ehpc-header-badge {
    font-size: 2.6rem;
    margin-bottom: 10px;
    display: block;
    filter: drop-shadow(0 0 20px rgba(232,33,43,0.5));
}
.ehpc-title {
    font-family: var(--hp-display);
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: 1px;
    color: #fff;
    text-transform: uppercase;
    margin-bottom: 6px;
}
.ehpc-subtitle {
    color: rgba(255,255,255,0.55);
    font-size: 0.88rem;
    font-weight: 400;
}

/* ── Tabs ── */
.ehpc-tabs {
    display: flex;
    background: var(--hp-dark2);
    border-bottom: 1px solid var(--hp-border);
    padding: 0 24px;
    gap: 2px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}
.ehpc-tab {
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    padding: 15px 22px;
    font-family: var(--hp-font);
    font-size: 0.88rem;
    font-weight: 600;
    color: rgba(255,255,255,0.45);
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
    letter-spacing: 0.3px;
}
.ehpc-tab:hover { color: rgba(255,255,255,0.8); }
.ehpc-tab.active {
    color: var(--hp-red);
    border-bottom-color: var(--hp-red);
}

/* ── Panel ── */
.ehpc-panel {
    display: none;
    background: var(--hp-surface);
    padding: 30px 32px;
    border: 1px solid #e2e6f0;
    border-top: none;
}
.ehpc-panel.active { display: block; }

/* ── Intro / Formula Box ── */
.ehpc-intro {
    background: #fff8f0;
    border: 1px solid #ffe0c0;
    border-left: 4px solid var(--hp-orange);
    border-radius: 0 8px 8px 0;
    padding: 14px 18px;
    margin-bottom: 24px;
    font-size: 0.9rem;
    line-height: 1.55;
    color: #333;
}
.ehpc-formula {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 10px;
}
.ehpc-formula-label {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--hp-orange);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
}
.ehpc-formula-eq {
    font-family: var(--hp-mono);
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--hp-dark);
    background: rgba(255,107,26,0.08);
    border: 1px solid rgba(255,107,26,0.2);
    border-radius: 6px;
    padding: 4px 10px;
}

/* ── Form Grid ── */
.ehpc-form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    margin-bottom: 24px;
}
.ehpc-field {
    display: flex;
    flex-direction: column;
    gap: 5px;
}
.ehpc-field-full { grid-column: 1 / -1; }

.ehpc-field label {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--hp-text);
    text-transform: uppercase;
    letter-spacing: 0.4px;
}
.ehpc-field small {
    font-size: 0.76rem;
    color: var(--hp-muted);
    font-weight: 400;
    text-transform: none;
    letter-spacing: 0;
}
.ehpc-input-row {
    display: flex;
    gap: 8px;
    align-items: stretch;
}
.ehpc-input-row input { flex: 1; min-width: 0; }
.ehpc-input-row select { flex: 0 0 140px; }

.ehpc-wrapper input[type="number"],
.ehpc-wrapper select {
    width: 100%;
    padding: 11px 14px;
    border: 1.5px solid #dde2f0;
    border-radius: 8px;
    font-family: var(--hp-font);
    font-size: 0.93rem;
    color: var(--hp-text);
    background: #fff;
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
    appearance: none;
    -webkit-appearance: none;
}
.ehpc-wrapper select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236b7394' 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 12px center;
    padding-right: 32px;
    cursor: pointer;
}
.ehpc-wrapper input[type="number"]:focus,
.ehpc-wrapper select:focus {
    border-color: var(--hp-red);
    box-shadow: 0 0 0 3px rgba(232,33,43,0.1);
}
.ehpc-wrapper input[type="number"]::placeholder { color: #b5bcd4; }

.ehpc-unit-badge {
    display: flex;
    align-items: center;
    padding: 0 14px;
    background: #f0f2f8;
    border: 1.5px solid #dde2f0;
    border-radius: 8px;
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--hp-muted);
    white-space: nowrap;
}

/* ── Button ── */
.ehpc-btn {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    background: linear-gradient(135deg, var(--hp-red), #c01920);
    color: #fff;
    border: none;
    border-radius: 9px;
    padding: 14px 30px;
    font-family: var(--hp-font);
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 0.3px;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 5px 18px rgba(232,33,43,0.35);
    text-transform: uppercase;
}
.ehpc-btn:hover {
    background: linear-gradient(135deg, #c01920, #a01018);
    box-shadow: 0 8px 24px rgba(232,33,43,0.45);
    transform: translateY(-1px);
}
.ehpc-btn:active { transform: scale(0.98); }

/* ── Result Block ── */
.ehpc-result {
    margin-top: 28px;
    border-radius: var(--hp-radius);
    overflow: hidden;
    border: 1.5px solid #e0e5f2;
    animation: ehpcFadeUp 0.35s ease;
}
@keyframes ehpcFadeUp {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}
.ehpc-result-header {
    display: flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(90deg, var(--hp-dark), var(--hp-dark2));
    padding: 14px 20px;
    color: #fff;
}
.ehpc-result-header h3 {
    font-family: var(--hp-display);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}
.ehpc-result-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
}
.ehpc-result-card {
    padding: 20px 16px;
    text-align: center;
    border-right: 1px solid #e8ecf5;
    background: #fff;
}
.ehpc-result-card:last-child { border-right: none; }
.ehpc-result-card.primary {
    background: linear-gradient(135deg, #fff5f5, #fff0f0);
}
.ehpc-result-label {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--hp-muted);
    margin-bottom: 8px;
}
.ehpc-result-val {
    font-family: var(--hp-mono);
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--hp-red);
}
.ehpc-result-card.primary .ehpc-result-val {
    font-size: 1.55rem;
    color: var(--hp-red);
}
.ehpc-result-note {
    padding: 13px 20px;
    background: #f8f9fd;
    border-top: 1px solid #e8ecf5;
    font-size: 0.82rem;
    color: #444;
    line-height: 1.6;
}
.ehpc-result-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 0.8rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 20px;
    margin-left: 8px;
}
.ehpc-badge-low    { background: #e8f8ef; color: #1a8a4a; }
.ehpc-badge-mid    { background: #fff4e0; color: #b05e00; }
.ehpc-badge-high   { background: #ffeaea; color: #cc0000; }
.ehpc-badge-super  { background: #f0e8ff; color: #6600cc; }

/* ── Reference / Conversions ── */
.ehpc-reference {
    background: var(--hp-dark2);
    border: 1px solid var(--hp-border);
    border-top: none;
    padding: 28px 32px;
}
.ehpc-reference h3 {
    font-family: var(--hp-display);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: #fff;
    margin-bottom: 18px;
}
.ehpc-conv-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}
.ehpc-conv-card {
    display: grid;
    grid-template-columns: auto 20px 1fr;
    align-items: center;
    gap: 8px;
    background: var(--hp-dark3);
    border: 1px solid var(--hp-border);
    border-radius: 8px;
    padding: 12px 14px;
}
.ehpc-conv-from {
    font-family: var(--hp-mono);
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--hp-gold);
    white-space: nowrap;
}
.ehpc-conv-arrow {
    color: rgba(255,255,255,0.3);
    text-align: center;
    font-size: 0.9rem;
}
.ehpc-conv-to {
    font-size: 0.80rem;
    color: rgba(255,255,255,0.65);
    line-height: 1.4;
}

/* ── Info Section ── */
.ehpc-info {
    background: var(--hp-bg);
    border: 1px solid #e2e6f0;
    border-top: none;
    border-radius: 0 0 var(--hp-radius) var(--hp-radius);
    padding: 28px 32px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.ehpc-info-block {
    background: #fff;
    border: 1px solid #e2e6f0;
    border-radius: 10px;
    padding: 18px 20px;
}
.ehpc-info-block h4 {
    font-family: var(--hp-display);
    font-size: 0.92rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    color: var(--hp-text);
    margin-bottom: 8px;
}
.ehpc-info-block p {
    font-size: 0.85rem;
    color: #444;
    line-height: 1.65;
}

/* ── Responsive ── */
@media (max-width: 640px) {
    .ehpc-header { padding: 24px 18px 20px; }
    .ehpc-title { font-size: 1.5rem; }
    .ehpc-panel { padding: 20px 16px; }
    .ehpc-reference { padding: 20px 16px; }
    .ehpc-info { padding: 16px; grid-template-columns: 1fr; }
    .ehpc-form-grid { grid-template-columns: 1fr; }
    .ehpc-field-full { grid-column: 1; }
    .ehpc-result-cards { grid-template-columns: 1fr 1fr; }
    .ehpc-result-card { border-right: 1px solid #e8ecf5 !important; border-bottom: 1px solid #e8ecf5; }
    .ehpc-result-card:nth-child(even) { border-right: none !important; }
    .ehpc-conv-grid { grid-template-columns: 1fr; }
    .ehpc-input-row select { flex: 0 0 110px; }
    .ehpc-tabs { padding: 0 8px; }
    .ehpc-tab { padding: 13px 12px; font-size: 0.80rem; }
}