/* ───── Percentage Calculator ───── */
.pc-container { max-width: 780px; margin: 0 auto; }

/* Section Header spacing */
.section-header { margin-bottom: 1.8rem; }
/* Mode Tabs */
.pc-tabs {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.45rem;
    margin-bottom: 1.5rem;
}
.pc-tab {
    padding: 0.6rem 0.5rem;
    border: 2px solid var(--border);
    border-radius: 12px;
    background: var(--bg-glass);
    color: var(--text-secondary);
    font-family: var(--font);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
    line-height: 1.3;
    backdrop-filter: blur(4px);
}
.pc-tab:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-light); }
.pc-tab.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}
.pc-tab:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Input Card */
.pc-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: 16px;
    padding: 1.5rem;
    backdrop-filter: blur(8px);
    margin-bottom: 1.25rem;
}
.pc-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}
.pc-inputs.col3 { grid-template-columns: 1fr 1fr 1fr; }
.pc-input-group { display: flex; flex-direction: column; gap: 0.35rem; }
.pc-input-group label {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
}
.pc-input-group input {
    padding: 0.7rem 0.85rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-size: 1rem;
    transition: border-color 0.15s;
}
.pc-input-group input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(255,107,74,0.12);
}
.pc-input-group input[aria-invalid="true"] { border-color: #e74c3c; }

/* Button Rows */
.pc-btn-calc {
    width: 100%;
    padding: 0.8rem 1.5rem;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 0.6rem;
}
.pc-btn-calc:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(255,107,74,0.3);
}
.pc-btn-calc:disabled { opacity: 0.5; cursor: not-allowed; }
.pc-btn-secondary-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.6rem;
}
.pc-btn-secondary {
    padding: 0.65rem 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    white-space: nowrap;
}
.pc-btn-secondary:hover {
    background: var(--border);
    border-color: var(--accent);
    color: var(--accent);
}

/* Results */
.pc-results {
    display: none;
    margin-top: 0.5rem;
}
.pc-results.show { display: block; }
.pc-results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 0.75rem;
    margin-bottom: 1rem;
}
.pc-result-item {
    text-align: center;
    padding: 1.25rem 0.8rem;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--accent-light), transparent 70%);
    border: 1px solid var(--border-glass);
    transition: transform 0.3s cubic-bezier(0.16,1,0.3,1);
}
.pc-result-item:hover { transform: translateY(-2px); }
.pc-result-value {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--accent);
    word-break: break-all;
    line-height: 1.3;
}
.pc-result-value.mono {
    font-family: 'SF Mono','Cascadia Code','Fira Code',monospace;
    font-size: 0.9rem;
}
.pc-result-label {
    font-size: 0.68rem;
    color: var(--text-tertiary);
    margin-top: 4px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Formula Section */
.pc-formula {
    padding: 0.75rem 1rem;
    background: var(--bg);
    border: 1px solid var(--border-glass);
    border-radius: 10px;
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-family: 'SF Mono','Cascadia Code','Fira Code',monospace;
    display: none;
}
.pc-formula.show { display: block; }
.pc-formula strong { color: var(--accent); }

/* Error */
.pc-error {
    font-size: 0.82rem;
    color: #e74c3c;
    min-height: 1.2em;
    margin-bottom: 0.5rem;
    display: none;
}

/* Processing */
.pc-processing {
    display: none;
    text-align: center;
    padding: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-style: italic;
}
.pc-processing.active { display: block; }

/* Toast */
.pc-toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent);
    color: #fff;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    z-index: 9999;
    font-size: 0.9rem;
    font-weight: 600;
    display: none;
}

/* Mobile */
@media (max-width: 600px) {
    .pc-inputs, .pc-inputs.col3 { grid-template-columns: 1fr; }
    .pc-tabs { gap: 0.3rem; }
    .pc-tab { font-size: 0.72rem; padding: 0.45rem 0.65rem; }
    .pc-results-grid { grid-template-columns: 1fr 1fr; }
    .pc-card { padding: 1rem; }
}